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玄武岩纤维对不同龄期低热水泥混凝土强度影响试验研究

Experimental Study on the Influence of Basalt Fiber on the Strength of Low Heat Cement Concrete at Different Ages

  • 摘要: 系统探究不同玄武岩纤维(BF)掺量及长度对不同龄期低热水泥混凝土强度影响规律,为改善低热水泥混凝土早龄期强度提供基础。BF掺量设置为0.0%、0.1%、0.2%、0.3%,长度设置为12 mm、24 mm,养护龄期设置为3 d、5 d、7 d、14 d、28 d,得到不同BF掺量及长度对不同龄期低热水泥混凝土抗压强度影响规律。研究结果表明:不同长度及掺量的BF均能改善低热水泥混凝土的强度性能,最大增幅达20.47%。不同龄期下BF纤维掺量及长度的强度作用效应存在显著差异。除3 d龄期外,其余龄期下抗压强度随12 mm BF掺量增加呈先增加后降低的趋势,抗压强度峰值掺量为0.2%。除28 d龄期外,抗压强度随24 mm BF掺量增加而持续增大,而28 d龄期抗压强度则呈先增大后降低趋势,转折点掺量为0.1%。相同BF掺量及长度条件下,BF对短龄期低热水泥混凝土抗压强度提升效果较长龄期更为显著,推荐BF长度12 mm,掺量0.2%。

     

    Abstract: The influence law of different BF content and length on the strength of low-heat cement concrete at different ages was systematically explored, which provided a basis for improving the strength of low-heat cement concrete at early ages. BF content was set as 0.0%,0.1%,0.2% and 0.3%, length was set as 12 mm and 24 mm, and curing age was set as 3 d, 5 d, 7 d, 14 d and 28 d. And the influence law of BF content and length on compressive strength of low-heat cement concrete of different ages was obtained. The results showed that the strength performance of low-heat cement concrete can be improved by BF of different lengths and contents with the maximum increase of 20.47%. There are significant differences in the strength effect of BF fiber content and length at different ages. Except for 3 d age, the compressive strength at other ages shows a trend of first increasing and then decreasing with the increase of 12 mm BF content, and the peak compressive strength content is 0.2%. Except for the 28 d age, the compressive strength shows an increasing trend with the increase of 24 mm BF content, while the compressive strength at 28 d age shows a trend of first increasing and then decreasing with the increase of 24 mm BF content, and the turning point content is 0.1%. Under the condition of the same BF content and length, BF has a more significant effect on the compressive strength of low-heat cement concrete at short age than that at long age. BF length of 12 mm and the content of 0.2% are recommended.

     

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