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The concrete in which common ingredients i.e. aggregate, water, cement are used is known as normal concrete. It is also called normal weight concrete or normal strength concrete.
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It has a setting time of 30 – 90 minutes depending upon moisture in atmosphere, fineness of cement etc.
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The development of the strength starts after 7 days the common strength values is 10 MPa (1450 psi) to 40 MPa (5800 psi). At about 28 days 75 – 80% of the total strength is attained.
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Almost at 90 days 95% of the strength is achieved.
Properties of Normal Concrete
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Its slump varies from 1 – 4 inches.
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Density ranges from 140 pcf to 175 pcf.
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It is strong in compression and weak in tension.
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Air content 1 – 2 %.
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Normal concrete is not durable against severe conditions e.g. freezing and thawing.