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]
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