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Aggregates in concrete

Aggregates

Aggregate plays an important role in concrete, the purpose of the aggregates within this mixture is to provide a rigid skeletal structure and to reduce the space occupied by the cement paste. Usually it is supplied in one of two main forms: precast (blocks, tiles, pipes, bridge beams, flooring systems, etc) or ready-mixed (as a liquid paste ready for pouring). It is used for the foundations, walls, floors, roofs and partitions of buildings, as well as bridges, dams, power stations and many other kinds of physical structures.

Rs. 32 per cft
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Aggregates are the materials in the inert granular form and these include the crushed stone, gravel and sand. When mixed with the Portland cement and water, these become the essential ingredients when it comes to the making of concrete. If one wants the mix of good concrete, the aggregates have to be clean and hard. The particles have to be strong and there has to be the absence of clay coatings and the absorbed chemicals. There should also be the absence of fine materials that are responsible for causing the deterioration of the concrete.

Division into the two categories –fine and coarse

The main composition of the fine aggregates is the natural sand. It can also be the crushed stone but the maximum number of particles should pass through the sieve with the dimension of 3/8 inch. When it comes to the coarse aggregate, the particle size exceeds 0.19 inch but the diameter range will be between 3/8 and 1.5 inches. IN gravel, one can find the maximum of coarse aggregate used as far as the concrete is concerned and the remaining is made up of the crushed stone.

Aggregates Making Process

Sand and natural gravel are generally dredged or dug from sea bed, river, lake or pit. One can produce the crushed aggregate by crushing the boulders, quarry rock, large sized gravel and cobbles. The general source of aggregate is the recycled concrete and this is used in a satisfactory manner for the soil cement, granular sub bases and also in the new concrete. After harvesting, the process for the aggregate is done and after this, it is crushed, screened and washed for obtaining the gradation and proper cleaning. If the feel arises, there is application of the benefaction process and this includes heavy media separation and jigging. This process is used for the upgrade of the quality. After the process, the aggregates are subject to handling or storing for the minimization of segregation as well as degradation and also for the prevention of contamination.

Influence of aggregates

There is a strong influence of the aggregates on the recent mixed as well as hardened properties of the concrete. Another influence is on the proportion of the mixture as well as the economy. The fact is aggregate selection is process of importance. There is expectation in slight variation in the aggregate properties and there are certain important characteristics as mentioned below:

  • Grading
  • Durability
  • Surface texture and shape of the particle
  • Skid resistance and abrasion
  • Voids and unit weights
  • Surface moisture and absorption

The reference of grading is with respect to determining the particle size distribution as far as the aggregate is concerned. The limits of grading and the maximum size of aggregate are specified because these properties have an impact the aggregate amount used apart from the water and cement requirements, pump-ability, durability and workability of concrete. In the general cases, in case, there is the correct selection of the water cement ratio, there is use of wide range of grading without the major impact on strength.

Rana infra Projects (RIPPL) is a well-known name in supply of the aggregates. There is a mark of trust in this area when it comes to the existing customer base of the company. Reliability and professionalism are two important pillars of the company for success in this area of business. The company based in the NCR region.