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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. Principle of airlifting for cleaning pile bores? Airlifting is generally carried out before concreting to remove debris and clean the base of pile bores. It basically acts a
• A potential source of harm - Mechanical hazard - Electrical hazard - Cutting hazard - Toxic hazard - Fire hazard - Explosion hazard
Define the term - post-tensioned concret In the Prescon and B.B.R.V. systems button heads are created at the ends of tendons. In the case of Prescon system, 2 to 130 tendon wir
what aare the parts and function of steel tape ?
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What is the calculation method of load bearing capacity of formwork material?
IN CASE CUBE IS FAIL WHAT CAN IDO
write buckling and dislodging of brick slip?
Movement accommodation factor is normally specified by manufacturers of joint sealants for designers to design dimension of joints. It is stated as the total movement that a joint
what is the actual quantity of water to be mixed in various grade of concrete and also the size of gravel to be mixed with in RCC work. Also I want to know the difference between a
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