METHOD STATEMENT FOR FLEXIBLE PAVEMENT

WORK METHOD STATEMENT FOR PRIME COAT APPLICATION AND LAYING OF ACB28

Plant and machinery to be Used.

1.       10 tons lorry

2.       Pneumatic roller

3.       Steel wheel roller

4.       Paver

5.       Prime coat sprayer (hand sparing system).

Work method statement for Prime Coat.

1.       Prior to laying of Bituminous Prime coat all intended roadbase surface shall be clean from dirt and loose material.

2.       The road surface finishing shall be first been approved for compliance in accordance to drawings and specification by Resident Engineer.

3.       Laying of prime coat shall be done by method of spraying thoroughly on the approved Roadbase surface.

4.       Contractor shall maintained the bituminous prime coat temperature during spraying activities at a range of 50 deg. Celsius – 70 deg. Celsius for cut back bitumen,  25 deg. Celsius to 45 deg. Celsius for bitumen emulsion and 150 deg. Celsius to 165 deg. Celsius for 80-100 penetration grade bitumen.

5.       The spraying rate or rate of application shall be at a range of 0.5liter to 1.0 litre / square meter.

6.       The area sprayed with bituminous material shall not be open to public for at least 24 hour after application.

7.       Laying of prime coat shall be witness by Resident Engineer or his representative.

8.       There shall be not bituminous material being discharge into road drains, stream or river.

Work Method Statement for laying of Asphaltic concrete.

1.       The laying of Asphaltic concrete  shall only start after 24 hours of bituminous prime coat application.

2.       The laying of asphaltic concrete shall be done only during fine weather and the intended surface shall also dry or as permitted by the Resident Engineer or his representatives.

3.       All surface that intended to received Asphaltic concrete must first being check for any damage or deterioration. If such defect was found out, it shall be rectified before laying of the Asphaltic Concrete.

4.       Delivered asphaltic mix shall be check for its temperature. The temperature Shall within the range of 140 deg. Celsius to 160 deg. Celsius.

5.       The compaction of the Asphaltic concrete by rolling method shall commence as soon as possible after laying.

6.       Compaction shall be carried out by using Steel wheel roller as initial rolling followed by Pneumatic tyred roller.

7.       The final rolling shall again be carried out using steel wheel roller.

8.       All rolling shall be done in longitudinal direction.

9.       The laid layer of ACB 28 shall have a thickness of 50mm thick  with allowance of  -5mm thickness.

10.   Laying of Asphaltic concrete (where applicable), eg. Superelevation location, and on carriageway with cross-slope, shall start at the lower level towards the highest level. Laying shall not be carried out in a downhill direction.

11.   The section where Asphaltic concrete were laid, shall not be open to traffic for at least 4 hours after the commencement of rolling.  

12.   During the course of Asphaltic concrete laying activity, All necessary sign shall be erected  at both end of the intended work to notify public on the ongoing construction activities to prevent unwanted incident.

13.   Within 24 Hours after completion of the Laying works, Coring test shall be perform at selected location as required by Resident Engineer to verify the thickness of the ACB 28 Layer and the compaction density. The required compaction density for ACB28 shall be in the range of 95% to 100% Marshall density.