You can estimate the values when both exposure conditions and strength must be considered; use the lower of the

two indicated w/c ratios. If flexural strength rather than compressive strength is the basis for design, such as a

pavement, perform tests to determine the relationship between the w/c ratio and flexural strength. An

approximate relationship between flexural and compressive strength is as follows:

Where--

f 'c = compressive strength, in psi

R = flexural strength (modulus of rupture), in psi, third-point loading

K = a constant, usually between 8 and 10

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