1. A concrete mix is produced in the laboratory using the following batch quantities: 16 kg of cement (C); 4 kg of fly ash (F); 10 kg of water (W); 40 kg of fine aggregate (FA) and 80 kg of coarse aggregate (CA). The relative density (or specific gravity) of cement, fly ash, fine aggregate, and coarse aggregate are 3.15, 2.40, 2.60, and 2.65, respectively. Assume that the aggregates are in the saturated surface dry (SSD) condition. If the amount of entrapped air in compacted concrete is 2%, determine the following: a. Mix proportions by weight b. Volumetric proportion of concrete components (in percentage) c. Unit weight (or wet density) of concrete d. Mix compositions (i.e., cement, aggregate, and water contents in kg/m³) e. Yield of the concrete batch f. If a concrete slab on ground, having the length of 3 m with 500 mm width and 100 mm thick, to be made, determine the number of batch weights, allowing 20% wastage of concrete. [Ans: (a) C: F: W: FA: CA= 1:0.25 0.625 : 2.5: 5.0; (b) Vc = 7.98%, VF = 2.62%, Vw = 15.72%, VFA = 24.20%, Vca = 47.47%; (c) 2358 kg/m³; (d) Wc = 252 kg/m³, WF = 63 kg/m³, Ww = 157 kg/m³, WFA = 629 kg/m³, WcA = 1258 kg/m³; (e) 0.0636 m³; (f) 3]

1. A concrete mix is produced in the laboratory using the following batch quantities: 16 kg of cement (C); 4 kg of fly ash (F); 10 kg of water (W); 40 kg of fine aggregate (FA) and 80 kg of coarse aggregate (CA). The relative density (or specific gravity) of cement, fly ash, fine aggregate, and coarse aggregate are 3.15, 2.40, 2.60, and 2.65, respectively. Assume that the aggregates are in the saturated surface dry (SSD) condition. If the amount of entrapped air in compacted concrete is 2%, determine the following: a. Mix proportions by weight b. Volumetric proportion of concrete components (in percentage) c. Unit weight (or wet density) of concrete d. Mix compositions (i.e., cement, aggregate, and water contents in kg/m³) e. Yield of the concrete batch f. If a concrete slab on ground, having the length of 3 m with 500 mm width and 100 mm thick, to be made, determine the number of batch weights, allowing 20% wastage of concrete. [Ans: (a) C: F: W: FA: CA= 1:0.25 0.625 : 2.5: 5.0; (b) Vc = 7.98%, VF = 2.62%, Vw = 15.72%, VFA = 24.20%, Vca = 47.47%; (c) 2358 kg/m³; (d) Wc = 252 kg/m³, WF = 63 kg/m³, Ww = 157 kg/m³, WFA = 629 kg/m³, WcA = 1258 kg/m³; (e) 0.0636 m³; (f) 3]

Fundamentals of Geotechnical Engineering (MindTap Course List)

5th Edition

ISBN:9781305635180

Author:Braja M. Das, Nagaratnam Sivakugan

Publisher:Braja M. Das, Nagaratnam Sivakugan

Chapter2: Soil Deposits-origin, Grain-size, And Shape

Section: Chapter Questions

Problem 2.15CTP: In concrete work, Fuller and Thompson (1907) suggested that a dense packing of grains can be...

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