Concrete Engineering Lectures

Introduction to Contrete Technology

 

What is Concrete

Concrete is one of the most versatile, economical, and universally used construction material. It is among the few building materials produced directly on the job by the user. To know proper mix, it is important for the user to identify desirable properties and components and to be able to use factors involved in producing concrete and the methods employed in concrete production. This lesson will help supervisors gain knowledge of the production and use of concrete materials.

Concrete as a Building Material

Concrete has a great variety of applications because it not only meets structural demands but also lends itself readily to architectural treatment. In buildings, concrete is used for footings, foundations, columns, beams, girders, wall slabs, and roof units--in short, all important building elements. Other important concrete applications are in road pavements, airport runways, bridges, dams, irrigation canals, water-diversion structures, sewage-treatment plants, and water-distribution pipelines. A great deal of concrete issued in manufacturing masonry units, such as concrete blocks and concrete bricks.

Batching
Is the process of measuring concrete mix ingredients either by volume or by mass and introducing them into the mixtures. Traditionally batching is done by volume but most specifications require that batching be done by mass rather than volume.
Percentage of accuracy for measurement of concrete materials as follows

1. Cement:

When the quality of cement to be batched exceeds 30% of scale capacity, the measuring accuracy should be within 1% of required mass.
If the measuring quantity is less than 30% i.e. for smaller batches. Then the measuring accuracy should be within 4% of the required quantity.

2. Aggregates:

If the measurement is more than 30% of the scale capacity then the measuring accuracy should be within 1%, if measurement is less than 30% then the measuring accuracy should be within less than 3%.

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