It is known that a concrete mix has 180 kg/m3 of water, 315 kg/m3 of sand. What is the coarse aggregate content in kg/m³, if the air content in the concrete is ignored? Assume the specific gravities of cement, fines, sand and coarse aggregate to be 3.15, 2.98, 2.64, and 2.74 respectively.

The relative amounts of the four chemicals in the final cement depends on the desired properties of the cement concrete. The table below gives the typical compound composition of different types of Portland cements Compound Composition No. C3S C,S C3A C4AF 1 60 13 9. 8 40 40 4 3 26 50 5 12 4 50 24 11 5 42 33 5 13 Depending on the properties of the different chemicals and their relative composition, identify the high early strength (HE) and low-heat (LH) cements from the table. Give detail explanation for your answer

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10. A sample of coarse aggregate weighs 1072 g when oven- dried, 1091 g when saturated surface-dried, and 667.6 g when submerged. Calculate the bulk specific gravity, apparent specific gravity, and absorption.