硅灰对聚丙烯-钢混杂纤维混凝土抗冻性能和力学性能的影响研究
Study on influence of silica fume on the frost resistance and mechanical properties of polypropylene-steel hybrid fiber reinforced concrete
关键词：
硅灰掺量；聚丙烯纤维；钢纤维；混杂纤维混凝土；抗冻性能；力学性能；协同作用；微观结构
Key words：
Silica fume content; Polypropylene fiber; Steel fiber; Hybrid fiber reinforced concrete; Frost resistance; Mechanical property; Synergistic effect; Microstructure
刊期：
2026年第2期
DOI：
10.19761/j.1000-4637.24080443
文章编号：
基金项目：
作者：
敬淼淼，沙 亮*
单位：
深圳市综合交通与市政工程设计研究总院有限公司，广东 深圳 518000
摘要
摘 要：研究了不同硅灰掺量（0、4%、8%、12%、16%）对聚丙烯-钢混杂纤维混凝土抗冻性能和力学性能的影响，测试了冻融循环后试件的质量损失、相对动弹性模量、抗压强度、劈裂抗拉强度和抗折强度，并进行了微观分析。结果表明：硅灰的填充效应和火山灰效应有助于降低聚丙烯-钢混杂纤维混凝土的孔隙率，提高混凝土的致密性，从而有效抑制混凝土在冻融循环中的性能劣化，提高力学性能；总体上，当硅灰掺量为12%时，混杂纤维混凝土的抗冻性能和力学性能最佳；硅灰与聚丙烯纤维、钢纤维的协同作用能够改善混凝土的抗冻性能，显著降低冻融循环引起的损伤。
Abstract: The influence of different silica fume content(0、4%、8%、12%、16%) on the frost resistance and mechanical properties of polypropylene-steel hybrid fiber reinforced concrete was studied. The mass loss, relative dynamic elastic modulus, compressive strength, splitting tensile strength and flexural strength of the specimens after freeze-thaw cycles were tested, and the microscopic analysis was conducted. The results show that the filling effect and the pozzolanic effect of silica fume help to reduce the porosity of polypropylene-steel hybrid fiber reinforced concrete, and improve the compactness of the concrete, thereby effectively inhibiting the performance deterioration of the concrete during freeze-thaw cycles, and improving the mechanical properties. Overall, when the silica fume content is 12%, the frost resistance and mechanical properties of hybrid fiber reinforced concrete is the best. The synergistic effect of silica fume with polypropylene fiber and steel fiber can improve the frost resistance of concrete, and significantly reduce the damage caused by freeze-thaw cycles.
结论
（1）掺入适量硅灰可以有效提高混杂纤维混凝土的抗冻性能，减少冻融循环过程中试件的质量损失和相对动弹性模量损失。当硅灰掺量为12%时，混杂纤维混凝土的质量损失率最低，相对动弹性模量最高。
（2）掺入适量硅灰可以有效抑制混杂纤维混凝土的抗压强度、抗折强度和劈裂抗拉强度在冻融循环中的劣化。200次冻融循环后，随着硅灰掺量的增加，混杂纤维混凝土的抗压强度、抗折强度和劈裂抗拉强度基本呈先上升后略微降低的趋势。
（3）钢纤维和聚丙烯纤维可以在不同阶段、不同尺度发挥对裂缝的抑制作用，并且纤维间的协同作用能够进一步改善混凝土的力学性能和抗冻性能。硅灰和纤维的协同作用能够有效降低冻融循环带来的混凝土损伤，抑制混凝土性能的持续劣化。
（4）综合考虑混杂纤维混凝土的抗冻性能和力学性能，推荐在高寒地区的路桥工程中，聚丙烯-钢混杂纤维混凝土中硅灰的最佳掺量为12%。
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引用本文
敬淼淼,沙亮.硅灰对聚丙烯-钢混杂纤维混凝土抗冻性能和力学性能的影响研究[J].混凝土与水泥制品,2026(2):40-44.
JING M M,SHA L.Study on influence of silica fume on the frost resistance and mechanical properties of polypropylene-steel hybrid fiber reinforced concrete[J].China Concrete and Cement Products,2026(2):40-44.
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