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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 What is the sucker deck principle for changeable depth bridge decks ? Answer For a variable depth bridge deck, depth of continuous multi-span bridge deck is greater tha
Q. Purpose of tar in bituminous materials? Tar is usually incorporated in bituminous materials due to the below reasons: (i) Blending of tar with bitumen possesses better b
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Sometimes side of concrete bridges is observed to turn black in colour . What is the main reason being for the phenomenon ?
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Mad/Sir What would be the Horizontal and vertical component from this acting force see diagram
Consider a market with one stock and one money market account, with the same assumptions on parameters (such as r, µ and s 2 ) as in the derivation of the Black-Scholes formula giv
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Micro-organism ratio: Determine the F/M ratio (in units of lbs BOD5/lb MLSS-day) using data provided in the above example problem. Solution By definition, F/M = Q S
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