聚丙烯纤维对混凝土力学性能和耐久性优化实验研究
Experimental Study on Optimization of Mechanical Properties and Durability of Concrete by Polypropylene Fibers
为优化混凝土的力学性能和耐久性,选用聚丙烯纤维(PPF)制备纤维增强混凝土,研究PPF对混凝土孔结构、力学性能和耐久性的影响。结果表明:PPF的加入能够降低混凝土的孔隙率,使有害孔和多害孔比例降低;PPF能够提高混凝土的力学性能,对劈裂抗拉强度增强效果显著;PPF能够改善混凝土的抗碳化性能、抗冻性能和抗氯离子渗透性能;PPF能够降低碳化深度,抑制冻融循环过程中孔隙率的增加,抑制氯离子相混凝土内部扩散。PPF最佳掺入体积分数为0.2%,相比对比样孔隙率降低34.8%,抗压强度和劈裂抗拉强度分别提高19.0%和19.3%,碳化后强度保留率达到94.3%,碳化深度降低34.4%,冻融破坏变弱,冻融后孔隙率增长幅度变小,不同深度的自由氯离子质量分数呈指数衰减趋势减小,氯离子扩散系数降低30.2%。
To optimize the mechanical properties and durability of concrete, polypropylene fiber (PPF) was selected to prepare fiber-reinforced concrete, and the effects of PPF on the pore structure, mechanical properties, and durability of concrete were investigated. The results indicated that the incorporation of PPF reduced the porosity of concrete and decreased the proportion of harmful and multi-harmful pores. PPF enhanced the mechanical properties of concrete, with a particularly significant improvement in splitting tensile strength. PPF improved the carbonation resistance, frost resistance, and chloride ion penetration resistance of concrete. PPF reduced carbonation depth, inhibited the increase in porosity during freeze-thaw cycles, and hindered the diffusion of chloride ions into the concrete interior. The optimal incorporation volume fraction of PPF was 0.2%, which reduced the porosity by 34.8% compared to the control specimen, increased the compressive strength and splitting tensile strength by 19.0% and 19.3%, respectively, achieved a strength retention rate of 94.3% after carbonation, reduced carbonation depth by 34.4%, weakened freeze-thaw damage, decreased the growth rate of porosity after freeze-thaw cycles, exhibited a reduced exponential decay trend in free chloride ion mass fraction at different depths, and lowered the chloride ion diffusion coefficient by 30.2%.
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山西省高等学校科技创新项目(2022L694)
青年科学研究项目(202303021212201)
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