particular specifications (road works) - CIDCO Maharashtra Ltd.

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CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 276 6.2.3.2 Provisional of lateral confinement of aggregates: While constructing wet mix macadam, arrangement shall be made for the lateral confinement of wet mix. This shall be done by laying materials in adjoining shoulders along with that the wet mix macadam layer and following the sequence of operations described in Clause 407.4.1 of MORT & H. 6.2.3.3 Preparation of mix : Wet – mix macadam shall be prepared in an approved mixing plant of suitable capacity having provision for controlled addition of water and force/positive mixing arrangement like pugmill or pan type mixer of concrete batching plant. For small quantity of wet mix work, the Engineer may permit the mixing to be done in concrete mixers. Optimum moisture for mixing shall be determined in accordance with IS:2720 (Part -8) after replacing the aggregate fraction retained on 22.4 mm sieve with material of 4.75 mm to 22.4 size. While adding water, due allowance should be made for evaporation losses. However, at the time of compaction, water in the wet mix should not very from the optimum value by more than agreed limits. The mixed material should be uniformly wet and no segregation should be permitted. 6.2.3.4 Spreading of mix : Immediately after mixing, the aggregates shall be spread uniformly and evenly upon the prepared subgrade/sub-base/base in required quantities. In no case should these be dumped in heaps directly on the area where these are to be laid nor shall their hauling over a partly completed stretch be permitted.
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 277 The mix may be spread either by a motor grader or a paver finisher or motor grader. For portions where mechanical means cannot be used, manual means as approved by the Engineer shall be used. The motor grade shall be capable of spreading the material uniformly all over the surface. Its blade shall have hydraulic control suitable for initial adjustments and maintaining the same so as to achieve the specified slope and grade. The paver finisher shall be self propelled having the following features: i) Moving hoppers and suitable distribution mechanism ii) The screed shall have tamping and vibrating arrangement for initial compaction to the layer as it is spread without rutting or otherwise marring the surface profile. iii) The paver shall be equipped with necessary control mechanism so as to ensure that the finished surface is free from surface blemishes. The surface of the aggregate shall be carefully checked with templates and all high or low spots remedied by removing or adding aggregate as may be required. The layer may be tested by depth blocks during construction. No segregation of large and fine particles should be allowed. The aggregates as spread should be of uniform gradation with no pockets of fine/coarse materials. 6.2.3.5 Compaction : After mix have been laid to the required thickness, grade and cross fall/camber, the same shall be uniformly compacted to the full depth with suitable roller. If the thickness of single compacted layer does not exceed 100mm, a smooth wheel roller of 80 to 100 kN weight may be used . For a compacted roller layer upto 200mm the compaction shall
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particular specifications (road works) - CIDCO Maharashtra Ltd.

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