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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.
dry process
Question During deep excavation , neighbouring ground water table is drawn down that might affect settlement of nearby buildings. What is remedial proposal to rectify situatio
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Question If on-site slump test fails, is it necessary that engineers allow a contractor to continue concreting works ? Answer This is an extremely traditional question raised by
the behaviour of structural materials
stress strain curves for any materials with an explanation
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A wall with a smooth vertical back 9 m high ropes a purely cohesive soil with c = 10 kN/m 2 and γ = 18 kN/m 3 . State the total Rankine active thrust per metre run, the positi
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Explain Beam-Columns 1. A specific case of a beam subjected to: Axial loading Strong axis flexural stress 2. The section is also pinned at both ends pe
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