GENERAL GEOLOGY

Detailed explanation-1: -Concrete aggregates are composed of geological materials such as gravel, sand and crushed rock. The size of the particles determines whether it is a coarse aggregate (e.g. gravel) or a fine aggregate (e.g. sand). The resulting concrete can be used in its natural state or crushed, according to its use and application.

Detailed explanation-2: -“Angular gravel is better, ” he says. “Round gravel is soft. You have to push it deeper into concrete than angular gravel, or it will break and spall the surface.”

Detailed explanation-3: -The most commonly used aggregates-sand, gravel, crushed stone, and air-cooled blast-furnace slag-produce freshly mixed normal-weight concrete with a density (unit weight) of 2200 to 2400 kg/m3 (140 to 150 lb/ft3). Aggregates of expanded shale, clay, slate, and slag (Fig.

Detailed explanation-4: -Because concrete is a very porous material, it will absorb any moisture that it contacts. This can cause pooling. Without crushed stone, pooling water will settle under it and erode your slab. Adding a layer of crushed stone will add proper drainage, as well as create a barrier between your slab and the ground.

Detailed explanation-5: -Concrete is a building material that has high compressive strength and low tensile strength and is composed of a mixture of cement, gravel and sand (aggregates), and water.