SPEC TIẾNG ANH lộ tẻ RẠCH sỏi technical specification kien giang EN

MINISTRY OF TRANSPORT (MOT)
CUU LONG CORPORATION FOR INVESTMENT, DEVELOPMENT
AND PROJECT MANAGEMENT OF INFRASTRUCTURE (CUU LONG CIPM)

LO TE – RACH SOI HIGHWAY CONSTRUCTION PROJECT
DỰ Á N XÂ Y DỰNG TUYẾN LỘ TẺ RẠCH SỎI
PACKAGE CW2: KM26+275.00 – KM53+279.00
GÓ I THẦU CW2: KM26+275.00 – KM53+279.00

BIDDING DOCUMENTS
PART Ⅱ – Specification

Volume 2: Technical Specification

August, 2015

JOINT VENTURE OF
DASAN CONSULTANTS CO., LTD.
AND PYUNGHWA ENGINEERING CONSULTANTS LTD.


TECHNICAL SPECIFICATION
TABLE OF CONTENTS

Page
DIVISION 2 - SITE WORKS
Section 2.1

Site Clearing and Grubbing

2.1

Section 2.2

Demolition and removal of existing structures and
obstructions

2.2

Section 2.3

Diversion and Protection of Existing Utilities

2.3

DIVISION 3 – EARTH WORKS
Section 3.1

Common Excavation

3.1

Section 3.2

Structural Excavation

3.2

Section 3.3

Not Applicable

3.3

Section 3.4

Not Applicable

3.4

Section 3.5

Embankment Construction

3.5

Section 3.6

Aggregate subbase and base

3.6

Section 3.7

Soft soil improvement

3.7

Section 3.8

Scarification

3.8

DIVISION 4 – WATERWAY WORKS
Section 4.1

Not Applicable

4.1

Section 4.2

Irrigation Channels

4.2

Section 4.3

Not Applicable

4.3

Section 4.4

Mortared stonework and Rip-rap

4.4

Section 4.5

Pipe culverts and Box culverts

4.5

DIVISION 5 - ASPHALT PRODUCT AND PAVEMENT
Section 5.1

Prime Coat and Tack Coat

5.1

Section 5.2

Hot Asphalt Mixtures

5.2

Section 5.3

Bituminous Surface treatment (BST)

5.3

Section 5.4

Waterproofing

5.4

DIVISION 6 - STRUCTURAL WORKS
Section 6.1

Precast concrete Piles

6.1

Section 6.2

Cast-in-place Bored Piles

6.2

Section 6.3

Concrete Structures

6.3

Section 6.4

Reinforcing Steel

6.4

Section 6.5

Prestressing

6.5

Section 6.6

Bridge Bearings

6.6

Section 6.7

Bridge Deck Expansion Joints

6.7

DIVISION 7 – NOT APPLICABLE
DIVISION 8 - MISCELLANEOUS
Section 8.1

Guard posts and Km Posts

8.1

Section 8.2

Traffic sign

8.2

Section 8.3

Guardrail

8.3

Section 8.4

Pavement Markings

8.4

Section 8.5

Planting of Grass

8.5

Section 8.6

Railings

8.6

Section 8.7

Bridge Drainage

8.7

DIVISION 9 - ELECTRICAL WORKS
Section 9.1

Lighting and Electrical Works

DIVISION 10 - DAYWORKS

9.1


DIVISION 2

SITE WORKS


DIVISION 2 - SITE WORKS

TABLE OF CONTENTS
2.1 - Site Clearing and Grubbing........................................................................................ 1
2.2 - Demolition and Removal of Existing Structures and Obstructions ........................... 5
2.3 - Diversion & Protection of Existing Utilities .............................................................. 11


DIVISION 2 – SITE WORKS

Site Clearing and Grubbing - Section 2.1

SECTION 2.1 - SITE CLEARING AND GRUBBING
TABLE OF CONTENTS
1. DESCRIPTION .................................................................................................................. 2
2. CONSTRUCTION REQUIREMENTS ............................................................................. 2
2.1. General............................................................................................................................. 2
2.2. Clearing and Grubbing and Tree Removal ...................................................................... 2

2.3. Topsoil Stripping ............................................................................................................. 2
2.4. Protection of Areas Designated to Remain ..................................................................... 3
2.5. Disposal of Cleared Material ........................................................................................... 3
3. MEASUREMENT AND PAYMENT ................................................................................. 3
3.1. Method of Measurement.................................................................................................. 3
3.2. Basis of Payment ............................................................................................................. 4

TECHNICAL SPECIFICATIONS - DIVISION 2

2.1 - 1 -


DIVISION 2 – SITE WORKS

Site Clearing and Grubbing - Section 2.1

SECTION 2.1 - SITE CLEARING AND GRUBBING
1. DESCRIPTION
This work consists of clearing, grubbing, removal of top soil, and removal and
disposal of all vegetation and debris within the project limits, excepting those
objects designated to remain in place or to be removed in accordance with other
sections of these Specifications.
This work also includes the preservation from injury or defacement of all
vegetation and objects designated to remain.
2. CONSTRUCTION REQUIREMENTS
2.1.

General
The Engineer will establish the limits of work and designate all trees, shrubs, plants
and other things to remain. The Contractor shall protect and preserve all items

designated to remain.

2.2.

2.3.

Clearing and Grubbing and Tree Removal
(a)

All surface objects and all trees, timber, rotten wood, stumps, roots, snags,
brush, other vegetation, rubbish, and other protruding obstructions, not
designated to remain, shall be cleared and/or grubbed, including disposal as
required.

(b)

In areas under roadway embankments, all stumps and roots shall be removed
to a depth at least 50 cm below the original ground surface and at least 50 cm
below the bottom of the designed lowest pavement layer.

(c)

In roadway cut areas, all stumps and roots shall be removed to a depth of not
less than 50 cm below the finished subgrade level.

(d)

All pits, channels and ditches shall be cleaned of unsuitable material..

(e)

Voids left after removal of roots shall be filled with suitable material and
compacted.

Topsoil Stripping
(a)

In areas under roadway embankments or where designated by the Engineer,
the Contractor shall remove the topsoil and dispose it of as directed by the
Engineer.

(b)

In general the removal of topsoil shall include only the removal of soil which
is sufficiently fertile to encourage or sustain the growth of vegetation.

(c)

Removal of topsoil over any designated area shall be to the depth as directed
by the Engineer, and the topsoil that in the Engineer’s opinion can be re-used
shall be stockpiled separately from other excavated material.

TECHNICAL SPECIFICATIONS - DIVISION 2

2.1 - 2 -


DIVISION 2 – SITE WORKS

(d)

2.4.

Site Clearing and Grubbing - Section 2.1

Where topsoil is to be used for dressing of the slopes of embankment or other
areas as directed by the Engineer or as indicated on the drawings, the work of
topsoil stripping will be deemed to include stockpiling of topsoil when
necessary as well as removal, placing and spreading of topsoil in areas
designated by the Engineer. In which case, the work shall be measured and
paid only under Specification Section 3.5 “Embankment Construction”. After
spreading, the topsoil shall be raked to form a smooth surface free from
weeds, roots, sods and large stones.

Protection of Areas Designated to Remain
In areas designated by the Engineer, the Contractor shall be responsible for the
protection and routine maintenance of existing shrubs, trees and grassed areas. On
completion of the Works these areas shall be returned to the Employer in the same
condition as before and any damage due directly or indirectly to the Contractor's
operations shall be made good at the Contractor’s own expenses.

2.5.

Disposal of Cleared Material
(a)

The Contractor shall have the right to use un-saleable timber (or saleable
timber when permission is granted in writing by the appropriate government
agency or authority) for his own purposes in connection with the Contract;
always provided that he has ascertained and complied with the requirements

of the relevant government agency or authority.

(b)

Saleable timber shall be neatly stored in an approved accessible place within
or near the right-of-way as directed and shall be trimmed and stacked in
accordance with the requirements of the relevant government agency.

(c)

All other timber, except timber to be used, and all brush, stumps, roots, logs,
and other refuse from the clearing and grubbing operation shall be disposed
of at locations provided by the Contractor.

(d)

The adjacent areas shall be left with a neat and finished appearance. No
accumulation of debris shall remain on or adjacent to the project.

3. MEASUREMENT AND PAYMENT
3.1.

Method of Measurement
(a)

Clearing and grubbing, demolition and removal of existing structures and
obstructions, and protection of designated areas, included in the work for Site
Clearing, shall be measured in square meters. Quantities will be based on the
field measurements and volumes approved by the Engineer.

(b)

Topsoil stripping (or Excavation organic soil) include stepped (if need) shall
be measured in cubic meters. Quantities will be measured and approved by
the Engineer.

(c)

Removal or protection of trees, regardless of their size or nature, shall not be

TECHNICAL SPECIFICATIONS - DIVISION 2

2.1 - 3 -


DIVISION 2 – SITE WORKS

Site Clearing and Grubbing - Section 2.1

measured or paid separately, and shall be deemed included in the work of Site
Clearing.
3.2.

Basis of Payment
Payment for Site clearing and Excavation organic soil shall be based on actual
quantity that accepted by Engineer, suitable with approved drawing and BOQ.
Quantities that out of approved drawings or other areas shall be borne by the
Contractor. Quantities in structure foundation, channel relocation,… shall be
measured follow related pay items in this Specification.

Pay Item

Description

Unit

2.01-01

Site Clearing

m2

2.01-02

Excavation organic soil

m3

TECHNICAL SPECIFICATIONS - DIVISION 2

2.1 - 4 -


DIVISION 2 – SITE WORKS

Demolition and removal of Existing Structures - Section 2.2

SECTION 2.2 - DEMOLITION AND REMOVAL OF EXISTING
STRUCTURES AND OBSTRUCTIONS

TABLE OF CONTENTS
1. DESCRIPTION ..................................................................................................................... 2
2. WORK REQUIREMENTS ................................................................................................... 2
2.1. General................................................................................................................................ 2
2.2. Removal of Drainage Structures......................................................................................... 3
2.3. Removal of Curbs ............................................................................................................... 3
2.4. Removal of Pavements, Footpaths, etc............................................................................... 4
2.5. Removal of Traffic Signs ................................................................................................... 4
2.6. Removal of Buildings and Structures ................................................................................. 4
3. MEASUREMENT AND PAYMENT .................................................................................... 6

TECHNICAL SPECIFICATIONS - DIVISION 2

2.2 - 5 -


DIVISION 2 – SITE WORKS

Demolition and removal of Existing Structures - Section 2.2

SECTION 2.2 - DEMOLITION AND REMOVAL OF EXISTING
STRUCTURES AND OBSTRUCTIONS

1. DESCRIPTION
Demolition and Removal of Existing Structures consist of the removal, wholly or in
part, and satisfactory disposal of blocks of masonry of an individual size greater
than 1 cubic meter, of all buildings, hedges, fences, structures, pavements, curbs,
and any other obstructions which are not designated or permitted to remain.
Demolition includes the salvaging of designated materials and proper backfilling
(in accordance with specification requirements) of any and all trenches, holes and

pits resulting from demolition and removal work.
Right of way acquisition may not be completed in all areas at the start-up of the
construction period and the Contractor shall schedule the work associated with this
Specification section accordingly.
Obstructions or other items that are designated for removal and disposal elsewhere
in the Contract Documents shall be dealt with in accordance with so stipulated
requirements.
2. WORK REQUIREMENTS
2.1.

General
Demolition and Removal of Existing Structures by the Contractor shall be provided,
within and adjacent to roadways, and on the right-of-ways, as shown on the
Drawings or as directed by the Engineer.
(a)

The Engineer may instruct that materials recovered from demolition work
shall remain the property of the Employer unless specifically provided
otherwise in the Contract Documents.

(b)

All designated saleable material shall be removed, without unnecessary
damage, in sections or pieces that may be readily transported, and shall be
stored by the Contractor at specified places on the project as directed by the
Engineer.

(c)

Basements or cavities left by structure removal shall be back-filled with

acceptable material to the level of the surrounding ground and, if within the
prism of construction, shall be compacted. There will be no separate payment
for backfilling and compaction the resulting cavities.

(d)

Demolition and Removal of Existing Structures includes salvage of materials
removed, their custody, preservation, and storage on the right-of-way or any

TECHNICAL SPECIFICATIONS - DIVISION 2

2.2 - 6 -


DIVISION 2 – SITE WORKS

Demolition and removal of Existing Structures - Section 2.2

other locations as may be designated by the Engineer or the Employer, or
disposal as provided herein.
2.2.

Removal of Drainage Structures
(a)

Bridges, culverts and other drainage structures in use by traffic shall not be
removed until satisfactory arrangements have been made to accommodate
traffic.

(b)

The removal of existing culverts within embankment areas will be required
only as necessary for the installation of new structures. Abandoned culverts
shall be broken down, crushed and sealed or plugged.

(c)

All culvert sections removed, which are not designated for stockpiling or
relaying, shall become the property of the Contractor and be removed from
the project or disposed of in a manner approved by the Engineer.

(d)

Unless otherwise directed, the substructures of existing structures shall be
removed down to the natural stream bottom and those parts outside of the
stream shall be removed down to at least 300 mm below natural ground
surface.

(e)

Where portions of the existing structures lie wholly or in part within the limits
for a new structure, they shall be removed as necessary to accommodate the
construction of the proposed structure. Where only a section of the existing
structure is to be demolished, the Contractor shall execute this work in such a
way as to avoid damage to the section designated to remain. All details of the
Contractor's proposed working method shall be submitted to the Engineer for
approval.

(f)

Any structures designated to become the property of the Contractor shall be
removed from the right-of -way.

(g)

Blasting or other operations necessary for the removal of an existing structure
or obstruction, which may damage new construction, shall be completed prior
to placing the new work, unless otherwise approved by the Engineer.

(h)

Steel bridges and wood bridges, when specified by the Engineer to be
salvaged, shall be carefully dismantled without damage. Steel members shall
be match-marked, unless the Engineer waives such match marking. All
salvaged material shall be stored as requested by the Engineer.

(i)

Unless waived in writing by the Engineer, all concrete removed that is of
suitable size for rip-rap and not needed for such use on the Project, shall be
stockpiled at locations designated by the Engineer, for use by the Employer.

TECHNICAL SPECIFICATIONS - DIVISION 2

2.2 - 7 -


DIVISION 2 – SITE WORKS

2.3.

2.4.

2.5.

2.6.

Demolition and removal of Existing Structures - Section 2.2

Removal of Curbs
(a)

Existing curbs designated for removal, including their bases, shall be broken
into pieces, the size of which shall not exceed 300 mm in any dimension and
stockpiled at designated locations on the site for use of the Employer, or
otherwise disposed of as directed by the Engineer.

(b)

Removal of existing curbs shall be undertaken in such a manner as to avoid
damage to existing pavements and curbs which are designated to remain.

Removal of Pavements, Footpaths, etc.
(a)

Irrespective of thickness, all asphalt or concrete pavements, footpaths, or
other hard surfaces designated for removal, shall be broken into pieces, the
size of which shall not exceed 300 mm in any dimension and stockpiled at
designated locations on the site for use of the Employer, or otherwise
disposed of as directed by the Engineer.

(b)

Removal of pavement shall be carefully undertaken to avoid damage to
abutting sections of pavement or structures designated to remain.

(c)

If removal of sections of old pavement, footpaths or other hard surfaces of an
individual size less than 10 cubic meters or excavation of ballast, gravel or
similar sub-base or base material is necessary, this work shall be considered
as Common Excavation, and shall conform to the requirements of
Specification “Common Excavation”, for construction, measurement and
payment.

Removal of Traffic Signs
(a)

Where directed, traffic signs including steel frames shall be carefully
dismantled, removed and stored where directed by the Engineer.

(b)

Concrete foundations shall be broken into pieces removed and stockpiled at
designated locations on the site for use of the Employer or shall be otherwise
disposed of as directed by the Engineer.

Removal of Buildings and Structures
(a)

Upon receipt of notification by the Engineer, the Contractor shall take over all
responsibility for the building or buildings then acquired and vacant and shall
proceed with the removal thereof as specified.

(b)

Unless otherwise indicated on the Drawings or directed by the Engineer, the
Contractor shall complete the demolition and removal of buildings and
structures together with all foundations and retaining walls, piers, partitions
and columns down to a plane 30 centimetres below the ultimate grade in the
area.

TECHNICAL SPECIFICATIONS - DIVISION 2

2.2 - 8 -


DIVISION 2 – SITE WORKS

Demolition and removal of Existing Structures - Section 2.2

(c)

Walls shall be broken into pieces not exceeding 60 square centimetres for any
area of surface, mixed with previous backfill material and placed in basement
areas.

(d)

Basement floor slabs shall be broken and displaced into pieces not exceeding

60 square centimetres for any area of surface and shall be left in place. Excess
debris shall be removed and disposed. All other foundations, concrete floor
slabs, sidewalks, signs, sheds, garages and fences and all other incidental and
collateral work necessary to fully complete the removal of the buildings and
appurtenances shall be removed and disposed.

(e)

The Contractor shall inspect each building he is to remove and determine for
himself the work involved and the equipment and the materials required for
such demolition work.

(f)

The Contractor shall arrange for the discontinuance of all utility services that
serve the building or buildings in accordance with the respective requirements
and regulations of the appropriate government agencies, and the utility
agencies involved.

(g)

The Contractor shall disconnect and properly seal, in a manner approved by
the local government agency or agencies responsible and the Engineer, all
sewer outlets that serve any building or buildings that the Contractor is
directed to remove.

(h)

The Contractor shall keep the Engineer informed of his plans for the
performance of any work in connection with the sealing off of such outlets in

order that proper inspection may be provided at the time the work is
performed.

(i)

The Contractor shall conduct his operations in such a manner as to avoid
hazards to persons and vehicles. After work is started on any building, the
work on that building shall be continued to completion, promptly and
expeditiously.

(j)

All debris shall be removed from basement areas and concrete floors broken.
The area shall then be filled with previous backfill material simultaneously
with the breaking of the foundation walls so that the previous backfill
material will be well integrated with the pieces of broken concrete.

(k)

Concrete slabs resting on earth and forming walks, driveways, or the first
floor slabs of buildings without basements except as indicated on the
Drawings shall be broken up and removed from the site.

(l)

The Contractor is responsible for removing any additional small “out’
buildings or miscellaneous structures which have not been indicated on the
Drawings.

TECHNICAL SPECIFICATIONS - DIVISION 2

2.2 - 9 -


DIVISION 2 – SITE WORKS

Demolition and removal of Existing Structures - Section 2.2

(m) Existing underground storage tanks on the site or within the buildings shall be
removed and disposed by the Contractor. The Contractor shall take all
necessary precautions during the removal of the fluid within the tanks and the
removal of the existing tanks. Where tanks are removed, the Contractor shall
backfill with fine aggregate. This backfill shall be in accordance with this
Specification section 3.2 “Structural Excavation”.
(n)

Structures designated to become the property of the Contractor shall be
removed from the right-of-way.

(o)

Operations necessary for the removal of an existing structure or obstruction,
which may damage new construction, shall be completed prior to placing the
new work, unless otherwise provided in the Contract.

3. MEASUREMENT AND PAYMENT
Demolition and removal of existing structures and obstructions shall not be
measured for payment and shall be included in the pay item of Site Clearing.
Demolition and removal of pavement, regardless of its nature (asphalt, concrete,
etc.) under this Specification section is applicable only when pavement removal is

required in conjunction with site clearing.

TECHNICAL SPECIFICATIONS - DIVISION 2

2.2 - 10 -


DIVISION 2 – SITE WORKS

Diversion & Protection of Existing Utilities - Section 2.3

SECTION 2.3 - DIVERSION AND PROTECTION
OF EXISTING UTILITIES

TABLE OF CONTENTS

1.

DESCRIPTION ............................................................................................................... 12

2.

CONSTRUCTION REQUIREMENTS .......................................................................... 12

3.

2.1

General..................................................................................................................... 12

2.2

Drawings and Documents........................................................................................ 13

2.3

Standards, Specifications and Codes ....................................................................... 13

MEASUREMENT AND PAYMENT ............................................................................. 13
3.1

Method of Measurement .......................................................................................... 13

3.2

Basis of Payment ..................................................................................................... 13

TECHNICAL SPECIFICATIONS - DIVISION 2

2.3 - 11-


DIVISION 2 – SITE WORKS

Diversion & Protection of Existing Utilities - Section 2.3

SECTION 2.3 - DIVERSION AND PROTECTION
OF EXISTING UTILITIES
1.

DESCRIPTION
This work consists of the identification, location, replacement, relocation, diversion,
rerouting and protection of existing public utilities.
In accordance with pertinent clauses of the Conditions of Contract, the Contractor,
together with the relevant provincial utility authorities, shall establish the locations
and routes at a later date.
If these works are requested by the Engineer, the Contractor must be selected and
contracted with a professional subcontractor and submit to the Owner for reviewing
and approving to carry out these works to confirm with technical and quality
requirements.
This specification section shall be updated and revised by a professional company
to appropriate with special technical requirements.

2.
2.1

CONSTRUCTION REQUIREMENTS
GENERAL
The scope of this work includes the supply and delivery to the Site, installation,
testing and commissioning as required of all materials, equipment and labor for the
actual replacement, relocation, diversion or protection of the following:
(a)

Water mains,

(b)

Water and sewage manholes,

(c)

10 kV medium voltage overhead lines

(d)

10 kV medium voltage ground cables,

(e)

220 V/380 V low voltage overhead lines,

(f)

Electric power substations,

(g)

Telephone overhead lines,

(h)

Telephone ground cables,

(i)

Telephone manholes,

(j)

Telephone and electric poles,

(k)

Other utilities as directed by the Engineer or the Employer, along with the

TECHNICAL SPECIFICATIONS - DIVISION 2

2.3 - 12-


DIVISION 2 – SITE WORKS

Diversion & Protection of Existing Utilities - Section 2.3

associated civil engineering works, all to the extent and in accordance with
the Drawings, Standards and Specifications for the installations issued by the
Vietnam Utility Authorities namely:

2.2



Local water supply companies for all the clean water main supply pipes.



Electricity of Vietnam for 35kV medium voltage overhead and
underground installations, 220/380V low voltage distribution overhead
lines and power substations.



Provincial communication companies for telephone overhead and
underground cables.

DRAWINGS AND DOCUMENTS
The Contractor shall refer to all relevant drawings issued by the Authorized
Agencies to ascertain for himself the relocation of routes of all utility services so as
to maintain adequate clearance between the services. The supplied drawings will
usually indicate the general arrangement of the works, and the Contractor shall
provide working drawings showing the exact routes of all pipes, overhead and
underground installations, the exact run of conduits and trunk-connection, the
location of manholes or control holes, draw-in and junction units, the number and
size of cables in each conduit, etc.

2.3

STANDARDS, SPECIFICATIONS AND CODES
The Provincial Utility Authorities will provide the following if required:


Materials Specifications



Codes, Standards, Construction Practices



Factory Inspections and Acceptance Test Procedures



As built drawings

Local Government shall provide these above documents (if need )
3.
3.1

MEASUREMENT AND PAYMENT
METHOD OF MEASUREMENT
For each utility to be replaced, relocated, diverted or protected, the extent of work
and the method of measurement will be established by the Engineer in accordance
with the requirements of the work as directed by the Employer and the actual work
carried out by the Provincial Utility Authorities or by the Contractor.

3.2

BASIS OF PAYMENT
The work, measured as specified above, where applicable, will be valued for
payment in accordance with its pertinent clause of “Provisional Sums” included in
the Conditions of Contract.

TECHNICAL SPECIFICATIONS - DIVISION 2

2.3 - 13-


DIVISION 2 – SITE WORKS

Pay Item
2.03-01

Diversion & Protection of Existing Utilities - Section 2.3

Description
Diversion and Protection of Existing Utilities

TECHNICAL SPECIFICATIONS - DIVISION 2

Unit
PS

2.3 - 14-


DIVISION 3

EARTH WORKS


DIVISION 3 – EARTH WORKS

Table of contents

DIVISION 3 – EARTH WORKS
TABLE OF CONTENTS
SECTION 3.1 – COMMON EXCAVATION ....................................................................... 1
1. DESCRIPTION .............................................................................................................. 1
2. CLASSIFICATION OF EXCAVATION ....................................................................... 1

3. CONSTRUCTION REQUIREMENTS ......................................................................... 3
4. MEASUREMENT AND PAYMENT ........................................................................... 5
SECTION 3.2 - STRUCTURAL EXCAVATION ................................................................ 6
1. DESCRIPTION ............................................................................................................. 6
2. CONSTRUCTION REQUIREMENTS ......................................................................... 7
3. MEASUREMENT AND PAYMENT ......................................................................... 12
SECTION 3.3 – NOT APPLICABLE .................................................................................. 14
SECTION 3.4 - NOT APPLICABLE .................................................................................. 15
SECTION 3.5 - EMBANKMENT CONSTRUCTION ...................................................... 16
1. DESCRIPTION ........................................................................................................... 16
2. MATERIAL REQUIREMENTS ................................................................................. 16
3. CONSTRUCTION REQUIREMENTS ....................................................................... 19
4. GEOTEXTILE SPREADING PROCEDURES .......................................................... 23
5. MEASUREMENT AND PAYMENT ......................................................................... 24

TECHNICAL SPECIFICATION – DIVISION 3


DIVISION 3 – EARTH WORKS

Table of contents

SECTION 3.6 – AGGREGATE SUBBASE AND BASE ................................................... 26
1. DESCRIPTION ........................................................................................................... 26
2. REFERENCE STANDARDS ..................................................................................... 26
3. SUBMITTALS ............................................................................................................ 27
4. MATERIALS REQUIREMENTS ............................................................................... 27
5. CONSTRUCTION REQUIREMENTS ....................................................................... 29
6. MEASUREMENT AND PAYMENT ......................................................................... 35
SECTION 3.7 - SOFT SOIL IMPROVEMENT ................................................................ 37

1. DESCRIPTION ........................................................................................................... 37
2. MATERIAL REQUIREMENTS ................................................................................. 39
3. CONSTRUCTION REQUIREMENTS ....................................................................... 46
4. MEASUREMENT AND PAYMENT ......................................................................... 61
SECTION 3.8 – SCARIFICATION AND REPAIRING EXISTING PAVEMENT ...... 64
1. DESCRIPTION ........................................................................................................... 64
2. CONSTRUCTION METHODS .................................................................................. 64
3. MEASUREMENT AND PAYMENT ......................................................................... 65

TECHNICAL SPECIFICATION – DIVISION 3


DIVISION 3 – EARTH WORKS

Common excavation - Section 3.1

SECTION 3.1 – COMMON EXCAVATION
1.

DESCRIPTION
(a) In general, Excavation works must be followed the requirements in TCVN
4447:2012 : Earthworks – Construction, check and acceptant.
(b) Common Excavation consists of all types of excavation within the limits of the
right-of-way, except for structure excavation, which specified in Section 3.2
“Structural Excavation”.
(c) Common Excavation shall be applicable for work that may be required and/or
directed by the Engineer.
(d) Common Excavation shall include the removal, handling and proper utilization
or disposal of all excavated materials, regardless of their nature or existing
condition, and shaping of excavation and preparation of the exposed surface of

excavation in accordance with these specifications and the lines, levels, grades,
dimensions and cross-sections shown on the Drawings and/or as required by
the Engineer.

2.

CLASSIFICATION OF EXCAVATION
Common Excavation will be categorized to 3 kinds, such as 1) Soil Excavation, 2)
Rock Excavation, and 3) Excavation of Unsuitable Materials.
(a)

Soil Excavation: Common excavation classified as “Soil Excavation” when
it is composed of the following materials:
 Soil: Roadway excavation classified as soil shall be in accordance with
Rock, soil classified tabulation in letter no. 1776/BXD-VP dated 16 Aug.
2007 of MOC. It shall include all soil excavation and soft rock (except for
Hard Rock and Boulders herein defined) regardless of its nature or existing
condition.
 Soft Rock: Soft rock shall comprise weathered rock, sandstone, limestone
and such materials which, in the opinion of the Engineer, can be excavated
by picking, ripping or other similar means without resorting to blasting.
However, Excavation of Unsuitable Materials is treated as different payment
item in this Specification as shown in bellow.

(b)

Rock Excavation: Common excavation will be classified as “Rock
Excavation” when it is composed of the following materials:

TECHNICAL SPECIFICATION – DIVISION 3

3.1 - 1 - of 66


DIVISION 3 – EARTH WORKS

Common excavation - Section 3.1

 Hard Rock: Roadway excavation classified as hard rock shall include
only such roadway excavation that, in the opinion of the Engineer, is not
practicable without the use of pneumatic tools or drilling and blasting
operations. Hard rock shall not include material which, in the opinion of
the Engineer, can be loosened or excavated with standard equipment
(tractor or backhoe). This soil class includes all the types of rock
described in the Vietnamese Standards for soil classification (letter no.
1776/BXD-VP dated 16 Aug. 2007 of MOC).
 Boulders: Boulders shall comprise solid pieces of rock that are weathered
on all faces and are between 0.25 m3 and 1.0 m3 in volume. Boulders will
be measured by the maximum length of the longest axis of the boulder
multiplied by the area of the circle with a circumference measured at the
widest point of the boulder. Boulders with a dimension exceeding the
above-stated volume and that cannot be pulverized without the use of
pneumatic tools, drilling and blasting operations, or by standard tractor or
backhoe, shall be classified as Hard Rock. However, boulders that are
over the above-stated volume but can be disposed of outside the Project
area by using common equipment for transportation without necessity of
blasting or pulverization, shall not be considered as rock excavation.
Boulders that are smaller than the above-stated volume shall be classified
as soil.
(c)

Excavation of Unsuitable Material: Common excavation will be classified
as “Excavation of Unsuitable Material” when it is composed of:
(1) Materials below the natural ground surface in embankment areas, and in
excavation areas below the grading plane or other limits shown in the
Drawings, or as designated by the Engineer, that are unsuitable for the
planned use.
(2) Surplus material over the amount required for the construction of the
embankment, provided however that it is not material rendered surplus
by reason of the Contractor having opened borrow pits solely for his own
convenience.
(3) Materials such as highly organic clays and silts, peat, muck, soil
containing a large amount of roots, grass and other vegetal matters,
domestic or industrial waste, might be classified as “unsuitable” under
this Specification Section.
(4) Soils with a liquid limit exceeding 60% and a plasticity index exceeding
35%.
(5) Soils with natural water content exceeding 50%.
(6) Soil with a very low natural density, 800 kg/m3 or lower.
(7) Highly expansive soil having an Activity Value greater than 1.0 or a
degree of expansion classified by AASHTO T258 “Standard Method of
Test for Determining Expansive Soils” as “Very High” or “Extra High”.

TECHNICAL SPECIFICATION – DIVISION 3

3.1 - 2 - of 66


DIVISION 3 – EARTH WORKS

Common excavation - Section 3.1

The Activity Value shall be measured by the Plasticity Index/Percent
Clay Size ratio. The application of equivalent ASTM standards is also
allowed depending upon the Engineer approval regarding to its proper
interpretation and application
(8) Materials having hazardous chemical or physical properties.
(9) Soil that cannot be properly compacted in accordance with Specification
requirements or as determined by the Engineer.
(10) Suitable materials that, in the Engineer’s opinion, were contaminated by
unsuitable materials during excavation operations.
(11) Material obtained from other work items within the Project area, which
quality and/or condition satisfies the requirements for materials of other
specification sections, but it is within one of the following categories:

3.
3.1



the total actual and effective distance for its transportation, from the
Site location where was obtained to the place where it is intended to
be used, is accepted by the Engineer to be longer than the distance
from an approved and operating quarry or borrow pit.



the route for its transportation is passing through existing or
temporary roads that are not in practical conditions, and
acknowledged by the Engineer to give critical affect to other works

in progress, or to a public road and existing traffic.



its use has not been approved by the Engineer, or was not considered
in the “Schedule of Materials” established in Specification Section
1.15 “Control of Materials”.

CONSTRUCTION REQUIREMENTS
Preparation Work
(a)

The Contractor shall, before and after clearing and grubbing, and before and
after excavation, and under the supervision by the Engineer, make a
topographical survey of the area and submit the surveyed cross section and
profile maps to the Engineer for his consideration and approval to use as a
basis for the computation of the actual volume of excavated materials.

(b)

Prior to excavation, all necessary clearing and grubbing in that area shall have
been performed in accordance with Specification Section 2.1 ”Site Clearing”.

(c)

The Contractor shall include in the “Schedule of Materials”, required by
Specification Section 1.15 “Control of Materials”, a detailed plan and
schedule for the use of “suitable material” in the Project including details
related to the location (of excavation and placement), construction method,
time schedule, testing, etc. This plan shall be continuously updated, on a

weekly basis, in accordance with the progress of the works until completion
of the roadway excavation. On the revision of the Plan, the Contractor shall

TECHNICAL SPECIFICATION – DIVISION 3

3.1 - 3 - of 66