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    蘇州混凝土水泥制品研究院有限公司

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    檢測及試驗方法研究

    超高性能混凝土滲透性的三種電測方法比較
    超高性能混凝土滲透性的三種電測方法比較
    • 王增浩,魏宇桐,路新瀛
    2020年第12期
    摘要
    引用本文
    摘 ? 要:利用ASTM C1202法、NT Build 492/RCM法及NEL法對三種市售超高性能混凝土(UHPC)基體預混料的滲透性進行了檢測,以分析其適用性。結果表明:ASTM C1202電量法的測試結果均在100 C以下,難以進行更加細致的區分;NT Build 492/RCM電遷移法即使在60 V下通電500 h,試件中的氯離子顯色深度也多在2 mm以內,由顯色深度讀數引起的測試誤差較大;NEL飽鹽電導率法的測試結果與現有研究結果基本吻合,考慮測試結果的區分度,該法仍是UHPC滲透性檢測的首選之法,但其可靠性仍需更多的實踐檢驗;對于無需測試氯離子擴散系數的場合,可直接采用規定測試條件下的試件電導率(或電阻率)來比較材料的滲透性高低。 Abstract: The ASTM C1202, NT Build 492/RCM and NEL test methods were used to compare the permeability of three commercial ultra-high performance concrete(UHPC) matrix premixes, and the applicability of these methods was analyzed. The results show that the ASTM C1202 electric charge method is mostly below 100 C, and it is difficult to make a more detailed distinction. For the NT Build 492/RCM electric migration test method, the chloride penetration depths after 500 h at 60 V are mostly within 2 mm together with large reading errors causing unavoidable fluctuations. The results of the NEL salt saturated conductivity method are basically consistent with the data reported in the literature, and considering the principle and the resolution, the NEL method is currently the preferred method for UHPC permeability evaluation even though its reliability still needs further practical inspections. For those cases the chloride diffusivities unnecessary, the electrical conductivity or resistivity of the UHPC can be directly employed to compare its permeability under the same testing conditions.
    王增浩,魏宇桐,路新瀛.超高性能混凝土滲透性的三種電測方法比較[J].混凝土與水泥制品,2020(12):79-83. WANG Z H,WEI Y T,LU X Y.Comparison of Three Electrical Testing Methods for Evaluation of Permeability of Ultra-high Performance Concrete[J].CHINA CONCRETE AND CEMENT PRODUCTS,(12):79-83.
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