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Concrete Mix Proportions
Concrete mix proportions should be chosen in such a way that concrete of adequate workability is obtained. Workability of concrete mix should be such that it can be compacted well using the available means of compaction. The recommended values of workability of concrete can be taken from IS : 456-1978. Concrete should surround all the tendons and other reinforcement well and should fill the formwork space completely so that the maximum density is achieved. When concrete hardens, it should have the needed strength, durability and surface finish.
A retaining wall 3.6 m high supports a dry cohesion less backfill with a plane ground surface sloping upwards at a surcharge angle of 20° from the top of the wall. The back of the
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Convert the azimuth reading of 273.34º to a land bearing: Solution: Convert 273.34º to degrees minutes and seconds = 273º 20' 24" Next, convert the angle to orient to IV
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Maintenance of Concrete Roads: The main defects that show up in a concrete road are : (a) cracks (b) loss of sealant (c) spalling at joints (d) loss of texture
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