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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.
Q. Show the Direction of gunning in shotcreting? At the time of the construction of shotcrete, it is intended at gunning the full thickness in one single operation and this hel
Given for the section shown in Figure, M * = 250 kNm, f sy = 500 MPa and f c ′ = 25 MPa. Compute A st and (if necessary) A sc . You may assume that eac
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Importance of racking load for a pre-stressed concrete beam Evaluation of cracking load for a pre-stressed concrete beam member is important for the following cases/reasons.
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Q. Local vehicle parapet strong enough to contain vehicles? Majority of local parapets are 1.1m high in addition they are designed to resist impact from a 1.5ton car moving at
Question For a l ong slender structure similar to beams, propping is compulsory after elimination of formwork with reasons? Answer After concreting, time at which arresting of
Explain the term - Loss of Prestress At the transfer stage, tendons produce compressive stresses in concrete. Sooner or later, the magnitude of these stresses experiences a re
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