141. Curing a concrete for long period ensures better
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142. Under normal conditions using an ordinary cement, the period of removal of the form work, is :
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143. While compacting the concrete by a mechanical vibrator, the slump should not exceed
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144. The maximum thickness of concrete floor of a cement warehouse, is
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145. The shuttering of a hall measuring 4 m x 5 m, can be removed after
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146. Pick up the correct statement from the following :
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147. If the effective working time is 7 hours and per batch time of concrete is 3 minutes, the output of a concrete mixer of 150 litre capacity, is
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