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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40μm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 increase the tensile, flexural and shrinkage properties of strain-hardened cementitious composites (SHCC), a superabsorbent polymer (SAP) was quantitatively incorporated into the blends.The uniaxial tensile test, four-point bending test , Compressive test, dry shrinkage test and environmental scanning electron microscope (SEM) were used to study the tensile strain capacity, flexural deformation capacity, compressive strength, shrinkage property, crack width and crack self-healing phenomenon of SHCC.The experimental results show that: SHCC showed a great strain hardening and deformation capacity, the tensile strain reached about 4.5%, the average crack width can be controlled at about 40μm; SHCC with SAP can reduce the shrinkage of 60%; cracked specimen after 3 Self-healing phenomenon occurred in the cracks after high / low humidity cycle maintenance, among which self-healing products could be completely filled with cracks in SHCC specimens improved by SAP.Research shows that the cost-effective SHCC is feasible.