Concrete Research and Technology
Online ISSN : 2186-2745
Print ISSN : 1340-4733
ISSN-L : 1340-4733
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  • Study on Effect of Paraffin on Combined Deterioration Resistance of Freeze-Thaw Damage and Salt Damage
    Hiroshi Maruta, Hirotaka Hazehara, Masashi Soeda
    2024 Volume 35 Pages 1-12
    Published: 2024
    Released on J-STAGE: March 15, 2024
    DOIhttps://doi.org/10.3151/crt.35.1
    JOURNAL FREE ACCESS
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    In this study, we investigated the effects of paraffin and its types on freeze-thaw resistance, hydration reaction of cement, and combined deterioration resistance of freeze-thaw damage and salt damage in concrete assuming a decrease in entrained air due to the construction process. This investigation found that the mixing of paraffin derived from petroleum improved the freeze-thaw resistance, and the hydration reaction of cement was unaffected. Paraffin-mixed concrete did not exhibit a decrease in the relative dynamic modulus of elasticity even under chloride environment. The mechanism of improvement of the freeze-thaw resistance was presumed to be linked to the existence of paraffin particles in concrete as pore fillers with size of 200 μm or less, which reduce the apparent air void spacing coefficient and block the continuity of capillary pores.

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