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6.31 A concrete mix includes the following ingredients per cubic foot: a. Cement = 25 lb b. Water = 11 lb c. No admixture Table P6.31 shows possible changes that can be made to the mix ingredi- ents. Indicate in the appropriate boxes in the table what will happen in each case for the workability and the ultimate compressive strength as increase, decrease, or approximately the same. TABLE P6.31 What Will Happen? Cement (lb) Water (lb) Admixture Workability Ultimate Compressive Strength 25 15 28 11 11 25 25 8 None None Water reducer Water reducer Superplasticizer Air entrainer Accelerator 25 25 11 11 11 25 AA mi nimant to unlu to the efforts of water reducer are