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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.
Define the term - permanent load Where the permanent load is less than or equal to 25% of the design imposed load, deflections may be calculated using any elastic method. When
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State the Loss of prestress Loss of prestress due to elastic shortening definitely occurs in pre-tensioned concrete members. But in post-tensioned members it does not occur if
Illustrate the types of prestressing we can classify prestressing into two forms : (a) longitudinal prestressing, and (b) circular prestressing.
Determine the ultimate bearing capacity of a square footing, 1 m × 1 m, resting on saturated clay of unconfined compression strength of 180 kN/m 3 and a bulk density of 18 kN/m 3
Compute the stresses at top and bottom fibers in a simply supported pre-stressed concrete beam with a rectangular cross section, 250 mm wide and 450 mm deep, as shown in Figure, at
Incoming water contains 2.5 mg/L as a substance of natural alkalinity (HCO3-). The flow rate is 9.5 ML/day). (a) What feed rate is required if the alum dose is 7 mg/L and is avail
How does the knife edge load simulate the existing condition of the bridge structure?
Q. Explain procedure of remote sensing in Satellites? Satellites used for remote sensing are of two types, viz, geostationary and polar orbiting. Geostationary stationary satel
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