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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.
Purification and Treatment of Water: In purification and treatment of water, we have discussed the important treatment process which is commonly used in making raw water from
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Q. Good surface regularity for sub-base in concrete pavement? Surfaces of sub-base material for concrete carriageway must be built in a regular manner due to the following reas
Surface Dressing: Surface dressing is an application of a thin film of bituminous binder followed by a coat of aggregates of single size, rolled into position. Surface dressi
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1. The topography of a local valley is shown. The horizontal distance between point P and Q is 11,456-ft. The percent grade (%) of line P-Q . 2. Based on the info
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