Q. Water proofing admixtures are available in powder, paste or liquid and gaesous form.

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Q. Which one is not a chemically active pore filling material?

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Q. Which one is not a chemically inactive pore filling material?

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Q. Chemically active pore fillers __________ the setting of concrete.

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Q. Chemically inactive pore fillers __________ the workability.

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Q. Water repelling materials like soda, potash soaps, etc make the concrete pervious.

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Q. Entrapped air normally exists in the form of relatively __________ air voids.

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Q. What are plasticizers?

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Q. Which one is an anionic surfactants?

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Q. What is the amount used of plasticizers in cement by weight?

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Q. What is the limitation of plasticizers?

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Q. At constant workability, what is the reduction in mixing water?

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Q. Where do we use plasticizers?

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Q. What is super plasticizers?

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Q. What is the allowed reduction of water with super plasticizers without reducing workability?

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Q. Is it possible to use w/c ratio as low as 5?

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Q. What is the limitation of Carboxylic acids in High range water reducers?

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Q. What is accelerator?

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Q. What is retender?

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Q. NaOH is the example of retenders.

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