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The characteristic compressive strength of concrete required in a project is 25 MPa and standard deviation in the observed compressive strength expected at site is 4 MPa. 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________. 46.7 |
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Answer» The characteristic compressive strength of concrete required in a project is 25 MPa and standard deviation in the observed compressive strength expected at site is 4 MPa. 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.
The water-cement ratio(in percent, round off to the lower integer) to be used in the mix is________.
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