Concrete

Types of concrete base on aggregate are lightweight concrete, normal weight concrete and heavyweight concrete (compare in unit weight). Strength: normal strength, high strength and very high strength. Construction: In-situ precast and pre-stressed.

Factor of workability (w) are water (increase lubrication thus for w), Fineness of cement (Higher cement content thus more water for larger specific surface), Aggregate shape and size (rough texture need more water than rounded), aggregate cement ratio (decrease water ration, not good), admixture (increase w) and temperature (decrease w)

Cement strength is depending on the amount of C-S-H gel formed. Thus, adding pozzolanic admixture such as fly ash and slag helps. Higher w/c ratio will decrease its strength. Curing provides better hydration and compaction reduces voids. The use of air entraining admixture reduces compressive strength as voids ratio increase. Meanwhile, types of aggregates will affect the water content.