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lab5 - CE 497 Lab#5 Concrete Mixing And Strength Testing...

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CE 497 Lab #5 - Concrete Mixing And Strength Testing Section 5
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Hui Fan 2/19/2009
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INTRODUCTION: The objective of this experiment is to investigate w/c of concrete by slump Test (ASTM C-143) and compressive strength examining entraining air (ASTM C-39). Base on the theory, as the w/c of concrete increase, the failure strength decrease. Also the entrained air in the concrete has effect on the failure strength. The expected result should be w/c have direct ratio to the average slump and w/c have the inverse ratio to the failure strength. PROCEDURE: The experiment divided into two steps. The first step is concrete mixing and sample casting. Each group cast five cylinders (3 by 6 in) and first two will be mixed for the entire class in a power mixer and last three will be batched and mixed by hand by each group. The w/c for each group is 0.5, 0.5, 0.5, 0.55, and 0.60. When the machine mixing for the class in complete, the slump of the mix will be measured as per ASTM C- 143 and then cast the material into the first cylinder mold as per ASTM C-192. The second cylinder cast the sample which air entraining agent added to the mixer and incorporated into the remaining concrete. The mixing of cylinders 3 to 5 have done by the
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