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通过室内自然失水成型和恒温干燥失水成型水泥基材料的强度试验,研究了聚丙烯纤维的保水效应对水泥基材料弯拉强度的影响。结果表明:与保湿成型养护相比,失水成型条件下普通水泥基材料的早期强度下降显著,而失水成型聚丙烯纤维水泥基材料的强度则降低较小;在相同失水环境下,聚丙烯纤维水泥基材料的早期强度相对普通组可提高30%~40%,纤维的保水效应及其对水泥基材料的增强作用显著。此外,纤维的保水、增强效果会随纤维体积掺量的不同而不同,就文中水泥净浆组的研究结果而言(纤维长为9mm),纤维体积掺量为0.4%时的增强效果最佳,然后依次是0.3%和0.1%,而纤维体积掺量为0.2%时的效果最差。
The effects of water retention of polypropylene fibers on the flexural strength of cement-based materials were studied by the strength tests of indoor natural water-loss molding and constant-temperature dehydration molding of cement-based materials. The results showed that the early strength of ordinary cement-based materials decreased significantly under the conditions of water-loss molding compared with that of moisture-curing molding, while the strength of cement-based materials of dehydrated polypropylene fibers decreased less. Under the same dehydration conditions, The early strength of acrylic fiber cement-based materials can be increased by 30% ~ 40% compared with ordinary group, and the fiber’s water retention effect and its enhancement effect on cement-based materials are remarkable. In addition, the water retention and reinforcement effect of the fiber varies with the volume of the fiber volume. For the study results of the cement paste group (fiber length 9 mm), the best reinforcement effect is obtained when the fiber volume content is 0.4% , Followed by 0.3% and 0.1%, respectively, while the fiber volume fraction of 0.2% is the worst.