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Find the weight (in kg) of cement, water, flyash, fine and coarse aggregate to produce a...

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Civil Engineering

Find the weight (in kg) of cement, water, flyash, fine andcoarse aggregate to produce a cement/flyash mix for pumpedconcrete, using the British Method that has a characteristic28-day compressive strength of 45 MPa. One hundred laboratory testresults on the controlling mix show a standard deviation of 5.3 MPa(k=1.65). The exposure classification for durability purposes is A2and the conditions require a fly ash/ high early strength cementblend (with a 40% proportion of fly ash). The specific gravity ofthe crushed coarse 20 mm aggregate to be used is 2850kg/m3 and its dry rodded density is 1600kg/m3. The specific gravity of fine aggregate is 2750kg/m3 and its fineness modulus is 2.5. Assume the highearly strength cement density is 3150 kg/m3 and fly ashdensity to be 2000 kg/m3

Answer & Explanation Solved by verified expert
4.1 Ratings (693 Votes)
1 Target mean strength standard deviation fck fck kS k constant 165 Standard deviation 53 MPa fck 45 53165 53745 MPa 54 MPa 2 watercement ratio exposure condition is A2 as per British standard max wc ratio    See Answer
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