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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 Can all utility detectors detect depth of utilities ? Answer In Hong Kong, underground utility detectors are as a rule separated into two categories- electro
normal distribution in civil
Modulus of elasticity of light-weight concrete The modulus of elasticity of light-weight concrete is about 50 to 55% of that of normal-weight concrete. The loss of prestresses
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define scale and sludge and mention the scale and sludge forming substance and explain the prevention methods
A tank with vertical sides contain 3m of water in the bottom, overlain by 4m of oil with no intermixing. Draw pressure diagram due to the oil and water on one of the tank sides and
A saturated clay specimen is subjected to a pressure of 240 kN/m 2 . After the lapse of a time, it is determined that the pore pressure in the specimen is 72 kN/m 2 . What is t
Explain term - losses of prestress We know that with time, tendons lose some of their initial prestress (at the time of transfer of prestress). This is termed as 'losses of pre
The classification as soft wood and hard wood has commercial significance. The difference between soft wood and hard wood is described below: The color of soft wood is light
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