为了提高应变硬化水泥基复合材料(SHCC)的拉伸、弯曲力学性能以及干缩性能,将高吸水性树脂(SAP)定量地掺加在混合物中.采用单轴拉伸试验、四点弯曲试验、抗压试验、干缩试验和环境扫描电镜研究了SHCC的拉伸应变能力、弯曲变形能力、抗压性能、干缩性能、裂缝宽度和裂缝自愈合现象.实验结果表明:利用SAP改善的SHCC均表现出极大的应变硬化和变形能力,拉伸应变达到了4.5%左右,平均裂缝宽度能控制在40 μm左右;掺加SAP的SHCC能减少60%的干缩;开裂试件经过3个高/低湿度循环养护之后,裂缝中均出现了自愈合现象,其中被SAP改善的SHCC试件裂缝中,自愈合产物可以完整地填充裂缝.研究表明,利用SAP等材料制备高性价比的SHCC是可行的.%In order to improve the tensile property, flexural property and drying shrinkage of strain-hardening cementitious composites (SHCC), mixtures quantitatively modified with superabsorbent polymer ( SAP) were investigated. The uniaxial tensile test, the four-point bending test, the compressive test, the drying shrinkage test and the environmental scanning electron microscope (ESEM) were employed to investigate the tensile strain capacity, flexural deformation capacity, compressive strength, drying shrinkage, crack width and self-healing of SHCC. The experimental results show that SHCC modified with SAP particles exhibits excellent ductility and deformability, and the tensile strain is up to about 4.5% and the average crack width is controlled around 40 μm. Meanwhile, the drying shrinkage of SHCC modified with SAP particles can reduce by about 60%. Furthermore, the self-healing behavior is observed in the cracks of specimen after three cycles of high-low relative humidity curing, and the self-healing products can completely fill the cracks of SHCC specimens modified with SAP particles. It is, therefore, feasible to produce SHCC material modified with SAP particles, while simultaneously retaining higher material ductility.
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机译：为了提高应变硬化水泥基复合材料(SHCC)的拉伸、弯曲力学性能以及干缩性能,将高吸水性树脂(SAP)定量地掺加在混合物中.采用单轴拉伸试验、四点弯曲试验、抗压试验、干缩试验和环境扫描电镜研究了SHCC的拉伸应变能力、弯曲变形能力、抗压性能、干缩性能、裂缝宽度和裂缝自愈合现象.实验结果表明:利用SAP改善的SHCC均表现出极大的应变硬化和变形能力,拉伸应变达到了4.5%左右,平均裂缝宽度能控制在40 μm左右;掺加SAP的SHCC能减少60%的干缩;开裂试件经过3个高/低湿度循环养护之后,裂缝中均出现了自愈合现象,其中被SAP改善的SHCC试件裂缝中,自愈合产物可以完整地填充裂缝.研究表明,利用SAP等材料制备高性价比的SHCC是可行的.%In order to improve the tensile property, flexural property and drying shrinkage of strain-hardening cementitious composites (SHCC), mixtures quantitatively modified with superabsorbent polymer ( SAP) were investigated. The uniaxial tensile test, the four-point bending test, the compressive test, the drying shrinkage test and the environmental scanning electron microscope (ESEM) were employed to investigate the tensile strain capacity, flexural deformation capacity, compressive strength, drying shrinkage, crack width and self-healing of SHCC. The experimental results show that SHCC modified with SAP particles exhibits excellent ductility and deformability, and the tensile strain is up to about 4.5% and the average crack width is controlled around 40 μm. Meanwhile, the drying shrinkage of SHCC modified with SAP particles can reduce by about 60%. Furthermore, the self-healing behavior is observed in the cracks of specimen after three cycles of high-low relative humidity curing, and the self-healing products can completely fill the cracks of SHCC specimens modified with SAP particles. It is, therefore, feasible to produce SHCC material modified with SAP particles, while simultaneously retaining higher material ductility.
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