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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 It should be necessary that raking piles of a bridge abutment be placed under an embankment ? Answer For a bridge abutment to be supported on raking piles with dive
Q. Explain Flash Butt welding? In this process the ends of two rails are kept at fixed distance apart and a mould (designed to suit the rail section ) is fitted on. The rail en
Question In a concrete compression test , usually 150mmx150mmx150mm concrete cube examples are used for testing. Why isn't 100mmx100mmx100mm concrete cube samples used in test in
Determine about the pre-stressed concrete beam A pre-stressed concrete beam has a width of 200 mm and an overall depth of 400 mm. The permissible stresses in tension and compre
How the stabilization of black cotton soil was done in field? what are the methods to do that?
Define Use of scattered lighting for Underwater inspection of Bridge In this arrangement, a very high powered, tight beam spot light (beam angle less than 10°) is used. The lam
Define the Approach Velocity Typical problems have negligible approach velocity. v 1 = Q/A, where A = the cross-sectional area of flow in the channel. The value is not the ve
Transition Curves: If a vehicle travelling on a straight enters a horizontal curve abruptly, it will cause shock and sway. To avoid this, it is customary to provide a transit
Hi, i need discussion for softening point of bitumen 7.5 ?C
Q. Knife edge loads – representation of wheel axles? In BS5400 traffic loads for HA loading are given by uniformly distributed loads along loaded length and a knife edge load.
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