Q. Approximate ratio of the strength of the cement conc of 7 days to that of 28 days (2/3)?

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Q. Approximate ratio of strength of the 30 cm cube to that of 15 cm cube is _____________

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Q. Approximate ratio of direct tensile strength to flexural strength is ____________

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Q. The addition of a pozzolanic admixture such as fly ash reduces the ____________

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Q. Lowering of ____________ might also help, since this would reduce the amount of CH that forms.

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Q. When the ____________ content is low, most ettringite will be formed in the plastic state.

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Q. The philosophy of prescribing low ____________ cement to improve resistance to sulphate attack.

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Q. The quality of concrete, specifically a ____________ permeability, is the best protection against sulphate attack.

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Q. For concrete exposed to a very aggressive environment the w/c should be lower than __________

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Q. The quality of concrete, specifically a ____________ w/c ratio, is the best protection against sulphate attack.

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Q. The quality of concrete, specifically a ____________ cement content, is the best protection against sulphate attack.

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Q. Concentration of water-soluble sulphates in water ___________ ppm for mild exposure.

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Q. Concentration of water-soluble sulphates in water ___________ ppm for severe exposure.

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Q. The breaking up of cohesion in a mass of concrete is called ________

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Q. The separation of water or water-cement mixture from the freshly mixed concrete is known as bleeding.

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Q. The continuous strain, which the concrete undergoes due to application of external loads, is called __________

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Q. Harshness in concrete is due to the excess of _____________

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Q. In order to avoid segregation, the concrete should not be thrown from a height.

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Q. Reinforced cement concrete is equally strong in taking __________

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Q. Plain cement concrete is strong in taking ___________

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