How does aggregate size affect the strength of concrete?

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.

How the property of coarse aggregate affect the compressive strength of concrete?

(1) Coarse aggregate size is directly proportional to the slump (workability) of a fresh concrete with constant water cement ratio. (2) Compressive strength of a concrete increases with increase in coarse aggregate size.

What factors affect the compressive strength of concrete?

Factors Affecting Strength of Concrete

• Quality of Raw Materials.
• Water / Cement Ratio.
• Coarse / fine aggregate ratio.
• Aggregate / Cement Ratio.
• Age of concrete.
• Compaction of concrete.
• Temperature.
• Relative humidity.

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 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 coarse aggregate in concrete?

Coarse aggregates are any particles greater than 0.19 inch, but generally range between 3/8 and 1.5 inches in diameter. Gravels constitute the majority of coarse aggregate used in concrete with crushed stone making up most of the remainder.

What are the effects of properties of aggregate on concrete?

Aggregates influence the properties of concrete/mortar such as water requirement, cohesiveness and workability of the concrete in plastic stage, while they influence strength, density, durability, permeability, surface finish and colour in hardened stage. Aggregates are generally classified into two categories viz.

What affects concrete strength the most?

Water/Cement Ratio The ratio of the weight of water to the weight of cement is called Water/Cement ratio. It is the most important factor for gaining the strength of concrete. The lower w/c ratio leads the higher strength of concrete. Too much water leads to segregation and voids in concrete.

What is the size effect of concrete What is its role in determining the material strength of concrete?

It is important to consider the effect of size when estimating the ultimate strength of a concrete member under various loading conditions. Well known as the size effect, the strength of a member tends to decrease when its size increases.

What is the effect of coarse aggregate?

The quality of coarse aggregate has a significant effect on the compressive strength of high strength concrete. The compressive strength of steel slag aggregate concrete was more than that of crushed limestone aggregate 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.