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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.
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Question What is main mechanism of formation of soil plugs in marine driven steel piles with reinforced concrete infill? Answer Throughout initial driving process, ope
Seasoning of Timber It is a process by which moisture content in a freshly cut tree is reduced to a appropriate level. The durability of timber is increased by doing so. The se
A 9 metre high retaining wall retains a soil with the following properties: φ = 36°; γ = 18 kN/m 3 . What will be the enhance in horizontal thrust if the soil slopes up from the
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In a curved prestressed bridge , how ought to the guided bearings in piers of curved region be oriented with respect to a fixed bearing in abutment?
What is the economic span of a bridge
LOSS OF PRESTRESS DUE TO SHRINKAGE OF CONCRETE We know that concrete shrinks in volume when it dries up. This volume reduction takes place in the form of reduction of all dime
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