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When specifying concrete mix designs the water-cement ratio is based on the required strength at 28 days and air entrainment. The water-cement ratios can be specifying by selecting Tools > GDMS > Concrete > Water-Cement Ratios. The Water-Cement Ratios form will be displayed.

 

 

On this form the water-cement ratios at different strengths at 28 days can be specified for non-air entrained and air entrained concrete. The units for the strength can be in MPa or psi. Strengths can be added and removed using the buttons at the top of the form.