Category: 5. Concrete

Sand or fine aggregates form an important component of concrete. It helps to increase the bulk or volume of concrete, which in turn reduces the cost. It helps to adjust the strength of concrete by varying its ratio with cement. It also increases resistance to crushing. Aggregates reduce shrinkage and affect economy. Previously, aggregates were…

The inert material, most of which is passed on a 4.75 mm sieve and contains no more than 0-10% fines, is known as coarse aggregate. They can be placed in the following categories. The function of the coarse aggregate is to act as the main load-bearing component of the concrete. The nature of work decides…

Fine aggregate is inert or chemically inert material, most of which passes a 4.75 mm IS sieve and contains no more than 5% coarse material. They can be classified as follows: The fine aggregates serve the purpose of filling all the open spaces in between the coarse particles. Thus, it reduces the porosity of the…

The process of selecting the respective proportions of cement, sand, coarse aggregate and water to obtain concrete of desired quality is called concrete proportioning. There are various methods to determine the volume ratio of different components, such as arbitrary method, finesse modulus method, minimum voids method and maximum density method. Recommended concrete mixes for various…

Cement concrete is an admixture composed primarily of relatively inert mineral matter held together in the form of particles or flakes by a binding medium, which gives concrete its strength and durability. Sand and stone chips or stone are the inert materials and a combination of portland cement and water is the binder. Inert material,…

Cement concrete is a synthetic construction material obtained by mixing cement, water and some other inert materials. In the plastic state, the mixture becomes hard as rock when allowed to set. By properly adjusting the proportions of the various ingredients, concrete with sufficient compressive strength for various uses can be produced. The strength of concrete…