Lab 2 Report - Materials Testing Quality Assurance 55...

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55 Sedimentary Dr. Insitu, VT 05360 03 April 2008 Building Engineering and Design, Inc. 22 Sandhill Rd North Mossy Stone, Vermont 05346 Attention: Mr. Mehdi Moorfik Subject: Concrete Testing Results Dear Mr. Moorfik, Materials Testing & Quality Assurance has completed the various concrete tests you requested. The effect of the w/c ratio versus slump, w/c versus compressive strength, and the correlation of age versus compressive strength have all been investigated. MTQA investigated two different mix designs. One was batched from our own specifications, and the other was batched from your specifications. The mix design and batch weights were investigated. Samples were supposed to be both air and wet cured. The mix criteria you outlined are as follows: The application is an interior 18 inch square column, clear distance between rebar is 4 inches with 1-1/2” of clear cover. The calculated mix design batch weights can be found in Table 6-1 The methods used in sampling, batching, and mixing the concrete are outlined in the appendix. A variety of ASTM standards was used; refer to the standards for specific procedures. ASTM C94 was used to create the mix. ASTM C172 was used to sample the mixed concrete. ASTM C231 and C173 were used to determine the air content. ASTM C31 was used to make and cure the test specimens. ASTM C39 was used to determine the compressive strength of the specimens. ASTM C143 was used to determine the slump of the fresh concrete mix. ASTM C1064 was used to determine the temperature of the fresh mix. ASTM C138 was used to determine the unit weight of the concrete tested. Several deviations occurred during testing. Those include: Neoprene Pads were used instead of sulphur caps because the lab was out of sulphur the day the 4-day breaks took place of the Lab 4 mix. For the mix design, 36 day strengths were taken in place of 28 day breaks because the lab was again out of sulphur to make the caps. 4 day breaks were done in place of 3 day, because the technicians were not present to do 3 day breaks. The specimen for lab 6 that should have been air cured was accidently cured submerged in water.
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03 April 2008 Page 2 Table 4-1 and Figure 4-1 show the correlation of slump and w/c. It can be seen that when you increase the w/c ratio, the slump also increases. Exceptions to this would be if you were to have an admixture such as a superplasticizer, which
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Lab 2 Report - Materials Testing Quality Assurance 55...

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