The Cee 3030 Construction Materials Class Mixed Concrete With Varying Water Cement Ratios

1980 Words Apr 18th, 2016 8 Pages
On March 1st, 2016, the CEE 3030 Construction Materials class mixed concrete with varying water cement ratios and created three, 3” diameter by 6” high cylinders and three, 6” diameter by 12” high cylinders. The cylinders were cast according to the ASTM C31 standard. The class was divided into sections, then the sections were divided into teams. The sections mirrored each other, and teams created concrete with 0.40, 0.44, 0.48, and 0.52 water cement ratio. Over the next 28 days the cylinders were tested for compressive strength, f’c, unit weight, and resistivity. Before casting the concrete was tested for workability by a slump test, unit weight by a unit weight test, and for air content by an air entrainment test. All test conducted followed the ASTM standards found in the references section.
On March 8th, 2016 the teams mixed concrete with a 0.4 water cement ratio. In addition, each team was assigned an additive to add to the concrete mix. One team per section was assigned 7.5 mL of water reducer, 15.0 mL or water reducer, 7.5 mL of water reducer and 22.1 grams of fiber, and 15 mL of water reducer and 44.2 grams of fiber. The concrete was molded into three, 3” diameter by 6” height cylinders and one 6” diameter by 12” height cylinder. Each team also tested the concrete mix for workability by a slump test and air entrainment by an air entrainment test. Over the next 28 days the cylinders were tested for compressive strength, f’c, unit weight, and resistivity.
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