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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.
Explain the Critical Depth d c is the depth of flow in an open channel that has the lowest energy. In rectangular open channels: (d c ) 3 = Q 2 /g(w) 2 In nonrectang
A soil sample with a grain specific gravity of 2.67 was filled in a 1000 ml container in the loosest possible state and the dry weight of the sample was found to be 14.75 N. It was
Q. PH Value of Water? It is a symbol for hydrogen ion concentration and indicates acidity or alkalinity. When P H Value more than 7 water is alkaline and less than 7 water is a
Define Equipments and tools for Inspection of Steel/Cast Iron Substructures? To ensure thorough inspection, the area must be cleared of all marine growth. Hand tools such as wi
Question Why are manhole covers finished of cast iron as same are through of ductile iron ? Answer Usually, manholes covers are made of cast iron. Though, in viewpoint of pipe
Define Analytical Methods Approved Under the Clean Water Act? Analytical Methods Approved Under the Clean Water Act CWA Section 304(h) needs EPA to publish test procedures (ana
causes for decay of timber
simply supported beam with point load at the centre
Define the Types of shock transmission unit? Presently two types of STUs are available in the overseas market: (a) Silicon putty based from UK and USA. (b) Oil based from
How to calculate the whole circle bearing from the included angles?
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