SC Water And Sewer Plants Practice Questions - South Carolina Water And Sewer Plants Contractor Examination Exam

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Two otherwise similar tank-wall mixtures are batched. Mix A has w/cm = 0.45 and Mix B has w/cm = 0.60. Which statement is correct?

Mix B will be stronger and less permeable because it is wetter and consolidates better Mix A will generally have higher strength and lower permeability, which is preferred for liquid-containing tanks Water-cementitious ratio does not affect permeability if slump is the same Mix A cannot be placed in a wall because 0.45 is too dry for any admixture to help

Correct Answer:

Mix A will generally have higher strength and lower permeability, which is preferred for liquid-containing tanks

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