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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. Energy dissipation at outlets - typical drainage outlet? Flow velocity at outlets is generally high. Without proper control of this energy, subsequent bank erosion can resu
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
Incoming water contains 2.5 mg/L as a substance of natural alkalinity (HCO 3 - ). The flow rate is 9.5 ML/day). (a) What feed rate is required if the alum dose is 7 mg/L and
Q. Calculation of crack widths arising from thermal movement In the calculation of thermal movement, the below formula is used in most codes: w max =s x a x (T 1 +T 2 )/2
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Q. Design of elastomeric bearings? The standard drawings of bridge bearings issued by RDSO are on the basis of UIC 772-R. To maintain uniformity of approach, the design of elas
Q. What do you mean by Base fixity? Base fixity When structures such as portal frames are associated to the base foundation, engineers have to determine the degree of fix
what should we do if alkalinity in water is greater than 25
wet process
the nick name of FeS is fool''s gold-explain
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