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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. Kerb overflow weirs – horizontal bars vs. vertical bars? Overflow weirs must be provided for steep roads (longitudinal gradient>5%), flat roads (longitudinal gradient Ess
A steam turbine with base 6 m × 3.6 m weighs 10,000 kN. It is to be placed on a clay soil with c = 135 kN/m 2 . Find the size of the foundation needed if the factor of safety is to
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Define the meaning of circular prestressing In circular prestressing, tendon wires are wrapped under tension over the concrete pipes which are pre-cast. The tension in the ten
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Question Give a reason that why are high and narrow beams not desirable in concrete piers? Answer Supported on past experience in other, high and narrow beams after
Question Does occurrence of rust have adverse collision to bond performance of bar reinforcement ? Answer In fact, presence of rust in bars cannot have adverse impact to the bo
NEED TO DESIGN A CANTILEVER RETAINING WALL 8M HIGH, SATURATED UNIT WEIGHT IS 16KN/M3, SURCHARGE IS 7KN/M2, LOAD ABOVE WALL SUPPORTED ON WALL STEM IS 10KN/M RUN, ANGLE IN INTERNAL F
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