Construction Materials

171) The red colour obtained by the bricks is due to the presence of

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iron oxide

172) The soil used for the manufacture of bricks should preferably not contain the following material

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all the above

173) Tiles are used for

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both (a) and (b)

174) Formation of whitish deposit on the bricks due to the presence of excess salts is called

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efflorescence

175) The water absorption of a good brick after 25 h immersion should be less than

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20%

176) The silicious and aluminous minerals, which do not have any cementinous qualities by themselves but which react with lime in the presence of water at normal temperature to form cementitious compound, are known as

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pozzalanic material

177) The ingredient added in the manufacturing process to control the setting time of cement is

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Gypsum

178) in sieve analysis of fineness test, the residues on No. 9 sieve after 15 minutes of sieveing should not be more than

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10%

179) The pozzolona protland cement gains the strength

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in more time than ordinary portland cement

180) Compared to the ordinary portland cement, the ultimate strength of the pozzolona portland cement is

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more

Subject Notes

Objective Box

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