Aggregates used in concrete

Topics: Concrete, Portland cement, Cement Pages: 4 (1329 words) Published: July 31, 2014
Aggregates is a major part of concrete, it is of urgent need that we look into the influence of aggregate on the fresh as well as hardened properties of concrete. Better grading of aggregate not only will show better results in the properties of the concrete but will also help in saving expensive materials such as cement, fly ash and admixture. ​ In the comparative study of influence of the aggregate on high strength concrete, here is an attempt to study strength characteristics of cubes and cylinders comprising of combination of different size of coarse aggregates namely 20MM,10MM and crushed sand. The experimental analysis has been divided into two categories by comparing the quality of concrete produced by not using 20mm in the mix design to form the compact and better flow in concrete against using standard grading techniques. The concrete mix design for characteristics M40, M50 strength, the water cement ratio is kept variable as regards to workability are accessed, The strength parameters of hardened concrete like compressive strength, split test strength are observed.

Concrete is a composite construction material, composed of cement (commonly Portland cement) and other cementitious materials such as fly ash and slag cement, aggregate (generally a coarse aggregate made of gravel or crushed rocks such as limestone,or granite, plus a fine aggregate such as sand), water and chemical admixtures. The word concrete comes from the Latin word "concretus" (meaning compact or condensed), the perfect passive participle of "concrescere", from "con-" (together) and "crescere" (to grow). Concrete solidifies and hardens after mixing with water and placement due to a chemical process known as hydration. The water reacts with the cement, which bonds the other components together, eventually creating a robust stone-like material. Concrete is used to make pavements, pipe, architectural structures, foundations, motorways/roads,bridges/overpasses,parking...
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