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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.
A wall with a smooth vertical back and 9 metres high retains a moist cohesionless soil with a horizontal surface. The soil weighs 15 kN/m3 and has an angle of internal friction of
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Define the term - pre- tensioning It is a method of prestressing in which tendons are placed, inside ducts or passages provided in concrete, after concrete gains sufficient str
Question While precast concrete jacking pipes , from time to time grout holes are calculated inside these precast pipes. Give specific and key reasons? Answer Grout h
Enumerate the term - superposing the stress variations If the case of concentric pre-stressing is considered, we can appreciate that stress at any section of the beam is compr
Find the Youngs modulus of the rod: A composite rod is made by joining a copper rod end to end with a second rod of different material but of same cross-section. At 25oC, the
assumptions made in the simple torsion theory
explain the term
Determine the meaning of Prestressed Concrete It is a type of concrete in which permanent internal stresses of a suitable nature, magnitude and distribution are intentionally
Common ways to present the project schedule include all except: a. Gantt charts b. Milestone charts c. PERT charts D. Project Network Diagrams with dates added So
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