The purpose of this research was to determine the accuracy of two test methods used in measuring the water to cement ratio (w/c) of fresh and hardened concrete. The microwave oven test based on a current ASTM Draft was used in determining the w/c of fresh concrete while the modified Norwegian PF-method was used to determine the w/c of hardened concrete. The microwave oven evaporates the water of a 1500 gram sample of fresh concrete to determine a w/c and can accurately measure the w/c within 0.05 of the true value. The modified PF-method uses an absorption method similar to ASTM C97 and Powers’ hydrations models to determine the w/c of hardened concrete. 100mm diameter concrete cores were prepared from slabs and 50mm thick concrete cylinders were tested. The results from this hardened concrete test had a large degree of variability; however, it was a useful indicator of concrete segregation.
| Identifer | oai:union.ndltd.org:TORONTO/oai:tspace.library.utoronto.ca:1807/65599 |
| Date | 04 July 2014 |
| Creators | Rebelo, Jonathan |
| Contributors | Hooton, Doug |
| Source Sets | University of Toronto |
| Language | en_ca |
| Detected Language | English |
| Type | Thesis |
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