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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. Coatings at the back faces of abutments? There are many views on the necessity of application of protective coatings (can be in the form of two coats of paint) to the back f
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Explain Situations that warrant a damage inspection? - Floods - bridges located in streams, rivers and other waterways with known or suspected scour potential. - Build-up of
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Requirements of Good Building Stones Here described requirements of good building stones: Strength: The stone should be capable to resist the load coming on
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Question In pumping stations one of choices for the material of water tanks is fibre-reinforced plastic. What are main advantages associated with this kind of material? An
Supplementary or Untensioned Reinforcement It is that reinforcement, provided in prestressed concrete member, which is not provided in a stretched condition like tendons.
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Define Mechanical tool for underwater inspection of bridge? Mechanical devices that involves a Schmidt Test Hammer for computing concrete surface hardness, and rotary coring eq
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