摘要:
采用涤棉混纺(P/C)和涤纶(PE)废弃织物增强水泥基透水混凝土砖,分析织物含量和织物尺寸等因素对复合透水砖(CPB)抗压性能、透水性和保水性的影响。结果表明:随着织物掺加体积分数的增加,CPB的抗压强度、压缩韧性指数和所消耗能量先增大后减小,透水系数和保水系数增加;随着织物尺寸增大,CPB的抗压强度、透水系数和保水系数逐渐减小,压缩韧性指数增加,耗能变化幅度不大;在织物和纤维掺加量较小且掺加质量相同的条件下,与废弃织物CPB相比,再生纤维CPB的抗压强度较小,而压缩韧性指数、耗能和透水系数较大;当织物掺加体积分数≤2%时,涤棉复合透水砖(PC-CPB)的抗压强度优于涤纶复合透水砖(P-CPB),透水系数、保水系数和P-CPB接近,当织物掺加体积分数>2%时则相反,而PC-CPB的压缩韧性指数和耗能始终优于P-CPB;织物掺加体积分数为2%的3 mm×3 mm P/C织物所制备的CPB抗压强度为28.20 MPa,耗能为1097.55 N·m,透水系数为0.267 mm/s,保水系数为43.40 g/cm2,与普通透水砖相比,分别提高了21.8%、55.8%、115.3%和33.3%。
Abstract:
The waste polyester/cotton(P/C) blended fabric and waste polyester(PE) fabric were used to reinforce the cement based permeable concrete brick. The effects of fabric content and size on the compressive property, permeability and water retention property of composite permeable brick(CPB) were investigated. The results show that with increasing of fabric additive volume fraction, the compressive strength, compression toughness index and absorbed energy of CPB first increase and then decrease, and the permeability coefficient and water retention coefficient increase; with increasing of fabric size, the compressive strength, permeability coefficient and water retention coefficient of CPB decrease, the compression toughness index increases and absorbed energy has little change; when the added amount of fabric and fiber with equal mass are smaller, compared with CPB reinforced with waste fabric, the compressive strength of CPB reinforced with recycled fiber is lower but the compression toughness index, absorbed energy and permeability coefficient are bigger; when fabric additive volume fraction ≤2%, the compressive strength of CPB reinforced with P/C fabric(PC-CPB) is better than that of CPB reinforced with polyester fabric(P-CPB), the permeability coefficient and water retention coefficient of PC-CPB are close to those of P-CPB, but when fabric additive volume fraction >2% the results are contrary, and the compression toughness index, absorbed energy of PC-CPB are always better than those of P-CPB; CPB reinforced with 2% fabric additive volume fraction 3 mm×3 mm P/C fabric has the compressive strength 28.20 MPa, absorbed energy 1097.55 N·m, permeability coefficient 0.267 mm/s, water retention coefficient 43.40 g/cm2, which are raised by 21.8%, 55.8%, 115.3% and 33.3% respectively compared with the ordinary permeable brick.
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