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GATE Civil Engineering (CE) 2019 Shift 2 Solved Paper

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Question : 16

Total: 65

The characteristic compressive strength of concrete required in a project is 25MPa and standard deviation in the observed compressive strength expected at site is 4MPa. The average compressive strength of cubes tested at different water-cement (w/c) ratios using the same material as is used for the project is given in the table.

w/c(%)	45	50	55	60
Average compressive strength of cubes (MPa)	35	25	20	15

The water-cement ratio (in percent, round off to the lower integer) to be used in the mix is________

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