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. 290 10.2 MATERIALS: 10.2.1 Bitumen: base material. This work shall consist of construction in a single or multiple layers of DBM on a previously prepared base or sub-base. The thickness of a single layer shall be 50mm to 100mm. The bitumen shall be paving bitumen of Penetration Grade 60/70 complying with Indian Standard Specifications for “Paving Bitumen” IS:73 and of the penetration indicated in Table 500-10 for MORT11H Specifications for dense bitumen macadam, or as otherwise specified in the Contract. Guidance on the selection of an appropriate grade of bitumen is given in The Manual for Construction and Supervision of Bituminous Works. 10.2.2 Coarse Aggregates: The coarse aggregates shall consist of crushed rock, crushed gravel or other hard material retained on the 2.36 mm sieve. They shall be clean, hard, durable of cubical shape, free from dust and soft or friable matter, organic or other deleterious substances. Where the Contractor’s selected source of aggregates have poor affinity for bitumen, as a conditions for the approval of that source, the bitumen shall be treated with approved anti-stripping agents, as per the manufacture’s recommendations, without additional payment. Before approval of the source, the aggregates shall be tested for stripping. The aggregates shall satisfy the physical requirements specified in Table 500-8 of MORT&H specifications, for Dense Bituminous Macadam. Where crushed gravel is proposed for use as aggregate, not less than 90% by weight of the crushed material retained on the 4.75mm sieve shall have at least two fractured faces.
CIDCO OF MAHARASHTRA LTD C.A.No.01/CIDCO/SE(KHR)/EE(KHR-I)/2010–11 Pg. No. 291 10.2.3 Fine aggregates: Fine aggregates shall consist of crushed or naturally occurring mineral material or a combination of the two, passing 2.36mm sieve and retained on 75 micron sieve. They shall be clean, hard, durable, dry and free from dust, and soft or friable matter, organic or other deleterious matter. The fine aggregate shall have a sand equivalent value of not less than 50 when tested in accordance with the requirement of IS:2720 (Part 37). The plasticity index of the fraction passing the 0.425 mm sieve shall not exceed 4, when tested in accordance with IS:2720 (Part 5). TABLE 500-8 PHYSICAL REQUIREMENTS FOR COARSE AGGREGATES FOR DENSE GRADED BITUMINOUS MACADAM Property Test Specification Cleanliness (dust) Grain size analysis 1 Max 5% passing 0.075 mm sieve Particle shape Flakiness and Elongation Index (Combined) 2 Max 30% Strength* Los Angles Abrasion Value3 Aggregate Impact Value4 Max 35% Max 27% Durability Soundness5 Sodium Sulphate Max 12% Magnesium Sulphate Max 18% Water Absorption Water absorption6 Max 2% Stripping Coating & stripping of Bitumen Aggregate Mixtures7 Minimum retained coating 95% Water Sensitivity** Retained Tensile Strength8 Min 80%
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