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6.27 WORK INSTRUCTION FOR PAVEMENT WORKS

OBJECTIVE

To outline the work instruction by which Pavement works are carried out.

SCOPE

The work instruction shall apply for all building and civil engineering projects.

RESPONSIBILITIES

Site Agent, Site Supervisor & Land Surveyor

MATERIALS

Sand, Quarry-dust, crusher run, bitumen prime coat / tack coat, asphaltic concrete

premix.

HANDLING AND STORAGE OF MATERIALS

a) Handling : Tipper truck

b) Storage : Stock piles at the storage yard when necessary.

PLANT, MACHINERY & EQUIPMENT

Motor grader, roller, tipper truck, back pusher, paver, tyre roller, tandem roller, etc.

where applicable.

PREPARATION OF ROAD FORMATION

Step 1

Obtain relevant approved construction drawings from Consultant / Engineer

Step 2

Set out the road chainage for certain equal interval. Offset the centerline chainage left

and right side.

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Step 3

Mark the offset point with timber / steel pegging and mark the propose level of the road

on the peg.

Step 4

If any, excavate the soft material and replace with suitable material and compact with

roller.

Step 5

Cut the formation level and grade to the propose level. Check the levels by referring to

the offset peg.

Step 6

Roll and compact properly and carry out field density test and CBR test on the sub-grade

level as per specification.

Step 7

Carry out joint inspection with Subcontractor on the formation level.

PREPARATION OF ROAD SUB-BASE

Step 1

Lay quarry dust or sands on the sub-grade level to the required thickness as specification

and compact roller.

Step 2

Carry out field test and CBR test on the sub-base as per specification.

Step 3

Carry out joint inspection with Subcontractor on the sub-base level.

PREPARATION OF ROAD BASE

Step 1

Lay crusher run on top of sub-base and compact by the roller. The thickness for any layer

is according to specification.

Step 2

Carry out field density test and CBR test on the road base as per specification if required.

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Step 3

Carry out joint inspection with Subcontractor on the road base. Use relevant form to

check on the thickness before proceeded to next stage.

Note: On normal warm day, watering may be required to the entire area where sub-base

and road base is laid. This is to prevent area from being dust which may be hazardous to

health and safety and to get better compaction as well.

PREPARATION OF PREMIX WORK

Binder Course

Step 1

Once the road base level is achieved and well compacted, sweep the surface with

power broom or equivalent to remove dust on the surface.

Step 2

Spray a layer of bitumen prime coat on the approved surface. Let the prime coat set

for 12 hours as per specification requirement.

Step 3

Lay binder course premix on top of the prime coat layer using paver / machine.

Step 4

For each layer of premix, compaction by tandem roller shall be done and follow up by

tyre roller (refer to project specification)

Wearing Course

Refer to work instruction of binder course above.