How does aggregate size affect the strength of concrete?
The tensile strength of the concrete is severely affected by increasing the size of the aggregate. On increasing the maximum grain size to 120–180 mm, the reduction in tensile strength is 30–50\% as compared with concretes with maximum aggregate size 20 mm. There is also a reduction in the elongation limit.
What effect does increasing the size of coarse aggregate in a concrete mix generally have?
Using larger coarse aggregate typically lowers the cost of a concrete mix by reducing cement requirements, the most costly ingredient. Less cement (within reasonable limits for durability) will mean less water if the water-cement (w/c) ratio is kept constant.
What is the effect of shape and size of aggregate in concrete?
A. Aggregate shape and surface texture influence the properties of freshly mixed concrete more than the properties of hardened concrete. Rough-textured, angular, and elongated particles require more water to produce workable concrete than smooth, rounded compact aggregate.
What is the role of coarse aggregate in concrete?
A coarse aggregate is also identified as any aggregate retained in a #4 sieve. Aggregates make up 60-80\% of the volume of concrete and 70-85\% of the mass of concrete. Aggregate is also very important for strength, thermal and elastic properties of concrete, dimensional stability and volume stability.
What is the function of coarse aggregate in concrete?
Functions Of Coarse Aggregate in Concrete 1. It makes a solid & hard mass of concrete with cement and sand. 2. It provides bulk to the concrete.
Why coarse aggregates are used in concrete?
Aggregate materials help to make concrete mixes more compact. They also decrease the consumption of cement and water and contribute to the mechanical strength of the concrete, making them an indispensable ingredient in the construction and maintenance of rigid structures.
Why is coarse aggregate used in concrete?
Coarse aggregates are defined as any material greater than 4.75 mm. Aggregates make up 60-80\% of the volume of concrete and 70-85\% of the mass of concrete. Aggregate is also very important for strength, thermal and elastic properties of concrete, dimensional stability and volume stability.
Why do we use coarse aggregate?
Coarse aggregates are used in every Construction projects which includes the construction of roads, Buildings, Railway Tracks etc. Coarse Aggregate in concrete was considered as chemically inactive and acts as a filler material only. The coarse aggregates are used for the manufacturing of mortar and concrete.