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QuestionDesign of concrete structures, normally most aggregate sizes are adopted with scopes from 10mm to 20mm. Does an increase of most aggregate size advantage structures? AnswerTo answer this query, let's consider the example of a cube. Surface area to volume ratio of a cube is 6/b that b is the length of cube. This implies that surface area to volume ratio reduces with an increase in volume. Then, when size of maximum aggregate is improved, surface area to be soaked by water per unit volume is condensed. Consequently, water requirement of concrete mixes is reduced accordingly so water or cement ratio can be lowered, resulting in a rise in concrete power. Though, increase of aggregate size is also accompanied by effect of reduced contact areas and discontinuities formed by these larger sized particles. In general, for utmost aggregate sizes less than 40mm, effect of lower water requirement could offset drawbacks brought about by discontinuities as recommended by Longman Scientific and Technical in 1987.
Question Would a concrete structure be entirely free of expansion joints and contraction ? Answer Consider that concrete structure is not subject to problem of disparity settlem
i. On single line by one or two men as required following and proceeding the lorry at a distance of 600 m. on the BG and 400 m. on the MG & NG carrying a banner flag across the tra
Maintenance of Gravel Roads: The maintenance consists of : filling up of potholes/depressions with fresh gravel and compacting after light sprinkling with water. g
GRADATION OF WMM
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Requirements of Good Building Stones Here described requirements of good building stones: Strength: The stone should be capable to resist the load coming on
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Q. Why does pipe jacking machine usually get stuck when the ground condition change from soil to very hard rock? When pipejacking machine moves from anarea of soil to very hard
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