聚丙烯纤维对聚合物防水砂浆抗裂和拉伸性能的影响
Influence of Polypropylene Fibers on Crack Resistance and Tensile Properties of Polymer Waterproof Mortar
为了揭示聚丙烯纤维(PPF)对聚合物防水砂浆的增强机理,对砂浆的流动度、孔隙率、结构、抗裂性能、拉伸性能进行测试及表征。结果表明:随着PPF含量的增加,砂浆流动度不断降低,孔隙率先降低后增加,水化产物不断增加,密实度先增加后降低。PPF提高了砂浆的抗裂性能和拉伸性能。加入PPF后,砂浆面板初始开裂时间变长,裂纹明显减少,裂纹长度、宽度和裂纹间距减小,主裂纹和裂纹面积的增长曲线向下平移。PPF抑制了拉伸荷载下的应变集中,使砂浆初裂拉伸强度(σs)和极限拉伸强度(σmax)提高。当PPF质量分数为0.4%时,砂浆的性能最优,与未加PPF的砂浆相比,流动度仅降低9 mm,而28 d裂纹条数和28 d裂纹面积分别降低36.4%和74.1%,σs和σmax提高78.6%和46.4%。
To reveal the reinforcement mechanism of polypropylene fiber (PPF) on polymer waterproof mortar, the fluidity, porosity, structure, crack resistance, and tensile properties of the mortar were tested and characterized. The results showed that with increasing PPF content, the mortar fluidity continuously decreased, the porosity first decreased and then increased, the hydration products continuously increased, and the compactness first increased and then decreased. PPF improved the crack resistance and tensile performance of the mortar. After adding PPF, the initial cracking time of the mortar panel was prolonged, the cracks were significantly reduced, and the crack length, width, and crack spacing decreased. The growth curves of the main cracks and crack area shifted downward. PPF inhibited strain concentration under tensile loading, leading to increased initial cracking tensile strength (σs) and ultimate tensile strength (σmax). When the PPF mass fraction was 0.4%, the mortar performance was optimal. Compared with the mortar without PPF, the fluidity only decreased by 9 mm, while the 28 d crack number and 28 d crack area decreased by 36.4% and 74.1%, respectively, and σs and σmax increased by 78.6% and 46.4%, respectively.
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浙江省基础公益研究计划项目(LGG20E080002)
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