Improving the chloride resistance in air-entrained concrete subjected to freeze-thaw

Joyce, Michael (2016) Improving the chloride resistance in air-entrained concrete subjected to freeze-thaw. BEng dissertation, University of Portsmouth.

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    Two different mix types, one of normal concrete with Ordinary Portland Cement (OPC) and one with a replacement of OPC with silica fume (by 10% mass of cement), were subjected to environments to investigate the behaviour of chloride penetration coupled with freeze-thaw action. The intention of this investigation was to support development of concrete mix designs for application in environments where a ‘combined case’ scenario of chloride water and freeze-thaw is likely.
    Comparisons were made between the mix design types, and varying water/binder ratios. Measurements of chloride penetration were made on specimens subjected to freeze-thaw and to ambient conditions for comparison. Strength tests were performed to provide a measure of concrete performance under the varying environmental conditions.
    The results show that effective compaction and the minimization of entrapped air is imperative, and that the inclusion of silica fume must respect its interrelationships with admixtures, as well as the relationship of admixtures themselves.
    The results indicate that the application of silica fume has the potential to reduce chloride penetration in freeze-thaw environments, provided that the considerations mentioned previously are met with the same degree of consideration as the strength qualities and beneficial permeability qualities of the microstructure of silica fume concretes.

    Item Type: Dissertation
    Departments/Research Groups: Faculty of Technology > School of Civil Engineering and Surveying
    Depositing User: Beth Atkins
    Date Deposited: 06 Sep 2016 13:06
    Last Modified: 06 Sep 2016 13:06

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