Chennai Metropolitan Development Authority Tender

Providing & laying spreading & Compacting graded stone aggeragate of size 45mm to 22.4mm, 22.4mm to 2.36mm & 2.36mm to 75 microns to Wet Mix Macadam (WMM) specification including premixing the material with water at OMC in Mechanical mix plant carriage of mixed material by tipper to site, laying in uniform layers with paver in Sub base / base course on well prepared surface and compacting with vibratory roller to achieve the desired density, rate including the cost & conveyence of all materials, labour charges for spreading, watering, rammed & consolidation and other tools & plants employed for the work etc., all complete and as directed by the departmental officers as per MORTH specification 406 IV Revision

Supplying and filling with M-Sand well watered rammed, and consolidated complying with relevant standard specifications etc., complete and as directed by the departmental officers.

Providing and laying to required line and grade as per the drawing interlocking rubber mounded cement concrete blocks of M 50 grade 100 mm thick laid over the sand cushion . The size and the shape of the concrete blocks had to be approved before sourcing / manufacturing the same. The aggregate used for the manufacture of the blocks shall be sound and free from soft piecces. The proportion of the coarse aggregate in the mix is typically 40 percent and the fine aggregate shall be 60%/ The size of the coarse aggregate should lie between 6mm and 12mm and the gradation should be in the recommended range for cement concrete mixes in general. The sand cushion 50mm thickness shall satisfy the following gradation table-1.The gaps between the two blocks shall be filled with relatively finer sand than the bedding sand of gradation as per Table 2 . The paver blocks shall be compacted using a light tandem roller or plate compactor till the required grade and line is achieved. The rate shall include laying of the bedding sand leveling , laying of paver blocks , filling of the filling sand and compaction