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Lesson on Concrete

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Submitted By ninjakol
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Concrete * is a construction material composed of cement and other cementitious materials such as fly ash and slag cement, aggregate, water, and chemical admixtures. * 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 stone-like material.
Concrete is used to make: * Pavements * Architectural Structures * Pipe * Foundations * Motorways * Bridges * Overpass * Parking Structures * Brick Wall * Block Wall * Gates * Fences

There are many types of concrete available, created by varying the proportions of the main ingredients below. By varying the proportions of materials, or by substitution for the cementitious and aggregate phases. The finished product can be tailored to its application with varying strength, density, or chemical and thermal resistance properties.

The mix design depends on the type of structure being built, how the concrete will be mixed and delivered, and how it will be placed to form this structure

Cement – Portland cement is the most common type of cement in general usage. It is a basic ingredient of concrete, mortar, and plaster.
Water – Combining water with a cementitious material forms a cement paste by the process of hydration. The cement paste glues the aggregate together, fills voids within it, and allows it to flow more freely.
Aggregates – Fine and coarse aggregates make up the bulk of a concrete mixture. (slate, stone, gravel, rocks, boulders and sand)

Various Test Conducted 1. Slump Test – this method requires a fabricated metal with shape and dimensions. 2. Compression Test – is the process applied in determining the strength of concrete.

The process of mixing concrete for building construction is done in...

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