Quality of Concrete. TS-128 Concrete shall be a mixture of cement, aggregates and water as covered respectively by sections above. TS-129 Where air-entrainment is required, the method to be used shall be specified in the Particular Specification. TS-130 The mix proportions, workability and strengths of the various types of concrete shall conform to the table below. TS-131 The terms contained in the table below are defined as follows: water/cement ratio: the term water/cement ratio means the ratio by weight of the water to the cement in the mix, expressed as a decimal fraction. The water is that which is free to combine with the cement in the mix. TS-132 This includes free water in the aggregate but excludes water absorbed or to be absorbed by the aggregate. The aggregate for this purpose shall be taken in a saturated surface-dry condition.
Quality of Concrete. All sidewalks, curbs, gutters, handicap ramps and driveway aprons shall be constructed of high-quality durable Portland cement concrete. The concrete shall be ready mixed, air entrained, 4000lb. concrete. All concrete shall be Class A.
Quality of Concrete. Concrete shall be a mixture of cement, aggregates and water as covered respectively by aforementioned Sections. The mix proportions, workability and strengths of the various types of concrete shall conform to Tables 4.3 to 4.5. The terms contained in Tables 2.3 to 2.5 are defined as follows: WATER/CEMENT RATIO (W/C): the term water/cement ratio means the ratio by weight of the water to the cement in the mix, expressed as a decimal fraction. The water is that which is free to combine with the cement in the mix. This includes free water in the aggregate but excludes water absorbed or to be absorbed by the aggregate. The aggregate for this purpose shall be taken in a saturated surface-dry condition. The absorption of the aggregates shall be determined in accordance with BS EN 1097 or any other method approved by the Engineer or his Representative. The strengths specified are for ordinary Portland cement to BS EN 197-1:2000; if other types of cement are specified, the required strength shall be as defined in the Bills of Quantities. Table 2.3: Grades of Concrete Grade Minimum works cube strength kg/cm2 Max Agg. mm Limits of agg/ Cement ratio by weight Use of concert if not otherwise specified At 7 days At 28 days Max. Min. Plain concrete foundation 100 150 20 10:1 8:1 Plain concrete foundations B-150 100 150 37 10:1 8:1 Blinding layer under RC Foundations B-200 150 200 20 7:1 5:1 RC structures in general 150 200 37 8:1 6:1 RC Foundation B-250 175 250 20 5.5:1 4:1 High load columns 175 250 37 6.5:1 4.5:1 High load foundation B-300 200 300 20 5:1 3:1 As specified 200 300 37 5:1 3:1 As specified B-400* 300 400 300 400 *Note: for grade of concrete B-400, trail mix shall be applied and approved by the engineer or his representative. Table 2.4: Standard Mixes Grade of concrete Minimum works Cube Strength kg/cm2 Weight of dry sand per 50 kg of cement Weight of dry coarse aggregate per 50 kg of cement Max design W/C ratio 7 days 28 days Low Med. High Low Med. High Kg Kg Kg Kg Kg Kg Kg B-150 110 150 100 200 180 150 245 210 200 0.60 B-200 150 200 91 193 159 136 226 193 170 0.55 B-250 175 250 80 170 136 113 204 170 147 0.50 B-300 200 300 68 147 113 91 170 136 113 0.45 B-400* 300 400 *Note: for grade of concrete B-400, trail mix shall be applied and approved by the engineer or his representative. Table 2.5: Workability Degree of workability 20 mm Xxx. size aggregate 37 mm Max Size aggregate Use for which Concrete is suitable Slump mm Compacting Factor Slump mm Compacting ...
