portland cement

portland cement - Executive Summary TO: Grace Hsuan FROM:...

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Executive Summary TO: Grace Hsuan FROM: SUBJECT: Aggregate Test DATE: February 6, 2008 Per your request, I have analyzed the type I and type III cements from all the different subgroups. The cubes ranged in strength of 10,286 psi to 4,086 psi. The strongest cube was made Wednesday, February 6, 2008 in the afternoon. It was made using a water- cement ratio of 0.34 and used type III cement. Its average strength was about 6,000 psi than the next strongest cement, which was also a type III cement with a water-cement ratio of 0.38. The type III cement typically has a higher in 7-day testing because it has a higher initial strength. One thing that was unpredicted was that the low water-cement ratios were also the weakest in strength. Usually the lower the water-cement ratio the stronger the cement due to the capillary voids. Also, besides the strongest cement cubes, the other cube groups in the Wednesday afternoon group were the two weakest in strength despite being type III cement. This could be do to a number of reasons. The machine may not have been calibrated or operated correctly, the water-cement ratios may not have been mixed correctly, insufficient taps on the wet cement may not have been performed, and the cubes may not have had enough time to harden. Judging by the test performed, I would go with a type III cement with a water-cement ratio of 0.34 due to its strength of 10,286 psi. Since it is type III has lower workability, an additive might be
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portland cement - Executive Summary TO: Grace Hsuan FROM:...

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