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METHODOLOGY FOR CONSTRUCTION OF WET MIX MACADAM

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Method Statement For Construction of Wet Mix Macadam

1.1 General This method describes the laying of Wet Mix Macadam over prepared GSB as per drawing and Technical Specification No. 406 from Km 164.500 to Km 200.000 1.2 Temporary Works Road diversion, drainage diversion etc shall be done as per site requirements. 1.3 Surveys i. The surface levels of GSB/WMM will be recorded in accordance with clause 902.3 and tolerances will be kept within limits as specified in Table 900.1. The measurements of surface levels for GSB shall be taken on offset points fixed transversely i.e.: 0.0, 2.25, 5.875, 9.5, 12.5 and 13.38/13.88 (end point) and of WMM at 2.25, 5.875, 9.5, & 11.15 at every 10mts longitudinal distance (level sheet enclosed). ii. Reference pegs will be fixed on either side at 600 mm distance from edge lines of WMM and at 10 mts longitudinal distances. iii. Surface undulations will be kept within tolerance and will be checked and rectified regularly iv. Survey of the GSB layer will be done and got approved from RE by submission of release form, prior to the commencement of WMM operation. 1.4 Utilities Utilities like electric poles, telephone lines, cables etc are identified and being shifted. 1.5 Traffic Arrangements and Control i. Temporary signboards will be kept all along the working zone to alert the people. ii. Flagman will be engaged to ensure free flow of traffic whenever & wherever

required. . 1.6 Access Access to the site will be through existing road by providing ramps. 1.7 Work Methodology 1.7.1 Plants and Equipment Crusher Plant, Batching Plant, Hydraulic Motor Grader, Paving machine, Vibratory Roller and Paver finisher.

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1.7.2 Construction i. Raw material will be obtained from Basaltic rock formation. ii. It shall be crushed through crusher plant into different sizes. iii. The different sizes will be blended in suitable proportion to get requisite mix. iv. The mix shall be prepared in the mixing plant having provision for controlled addition of water and forced mixing arrangement like pug mill. Due allowance shall be made for evaporation losses. v. The mix material shall be transported from mixing plant to the site. vi. Previously prepared GSB layer, if required, shall be re-inspected and remedial action (if any) will be carried out prior to the delivery of WMM. vii. To ensure lateral confinement of the layer Gravel shoulders and center median confirming to clause 407 of Technical Specifications up to WMM top will be prepared. viii. The material shall be spread in full width the help of a mechanical paver or hydraulic grader. ix. Laying in two operations with paver finisher will be done. Segregation of WMM along longitudinal joint shall be avoide. x. The segregated material, if any along the longitudinal section of the stretch will be racked out before laying balance width of the carriageway. xi. Rolling shall be carried out longitudinally and uniformly over lapping each preceding track at least by one-third width until the entire surface has been rolled. xii. Rolling will be done longitudinally starting from lower edge to upper edge. Material shall be compacted to required densith. xiii. High spot or depression will be corrected by removing or adding fresh material. xiv. All loose segregated or defective areas shall be made good in part or to the full depth of the layer as required and re-compacted. 1.7.3 Inspection and Testing i. Continuous level checking while grading is on to ensure proper grade and slope with the help of reference pegs. ii. Moisture content shall be kept within tolerable limits. iii. Rolling shall be started after OMC is checked. iv. All other testing will be done as per section 900 of Tech. Specifications.

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1.8 Safety i. Safety hazards will be identified both at site as well as at Wet Mix plant. ii. All the workers and staff will be briefed about the dangerous hazards. iii. Trained operators will be deployed near crusher as well as at site. iv. The height of material in open truck will be always kept less than the height of the sides of the truck to avoid spilling of material during transport. v. Sign boards will be kept all along the working zones to alert the people. While working adjacent to canals / waterways, proper barricading will be done to ensure safety. 1.9 Environmental i. Tippers with stoppers will be used for transportation. ii. No material will be allowed to fall during transition. iii. Stagnant water (if any) at site will be de-watered prior to start of work at site. iv. Dumping of WMM material will be done under controlled conditions. v. No material will be allowed to go into the existing waterways / canals. 1.10 Reinstatement / interphasing with next stage of work i. Construction traffic shall not be allowed on finished surface except in emergency. ii. Any loose pockets or defective spots will be rectified before application of Prime coat.