A concrete mix with a 75 mm slump, w/c ratio of 0.50, and sand with a fine-ness modulus of 2.4 contains 1009 kg/m3 of coarse aggregate. Compute therequired mass of coarse aggregate per cubic meter. To adjust the mix so as toincrease the compressive strength, the water–cement ratio is reduced to 0.45.Will the quantity of coarse aggregate increase, decrease, or stay the same?Explain your answer.

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Types of Cement

Cement is a fine mixture of limestone, chalk, or marl and clay which when mixed with water, becomes compacted due to the formation of strong molecular bonds. Due to hydration, cement turns into a hard mass when left for a sufficient amount of time upon mixing with water. The water turns the cement compounds into gel-like submicroscopic particles having higher surface areas. It is due to the hydration properties of cement, they are often known as hydraulic cement. For instance, Portland cement is a popular example in this category.