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通过狗骨试件拉伸试验、数字图像影像相关处理(DIC)和立方体试块轴压试验,研究了高粉煤灰掺量的超高韧度水泥基复合材料(ECC)在亚高温处理后的力学性能。结果表明:在不高于200℃的温度处理后,ECC仍能实现多裂缝开裂,并能有效地控制裂缝的宽度。50、100℃温度处理明显提高了ECC的抗拉强度和应变能力,200℃时有所回落,但仍高于常温水平。DIC法的测试结果显示,各温度工况下基体在极限拉伸时的裂缝宽度相近,不同温度的影响主要体现在裂缝的数量上。在20、50和100℃时,ECC抗压强度大小相当,200℃时下降19.3%。适当的温度处理可以提高ECC基体的强度并改善纤维与基体的界面性能,从而提高ECC的抗拉性能和应变硬化能力。
The effects of high fly ash content of ultra-high toughness cementitious composites (ECC) after sub-high temperature treatment were studied by tensile test, digital image processing (DIC) and cubic test of block. The mechanical properties. The results show that ECC can still achieve multi-fracture cracking and can effectively control the crack width after being treated at a temperature not higher than 200 ° C. The temperature of 50 and 100 ℃ significantly improved the tensile strength and strain ability of ECC, but dropped back to 200 ℃, but still higher than normal temperature. The test results of DIC method show that the crack width of the substrate under ultimate tensile at various temperature conditions is similar, and the influence of different temperatures is mainly reflected in the number of cracks. At 20, 50, and 100 ° C, the compressive strength of ECC was comparable to that of 19.3% at 200 ° C. Appropriate temperature treatment can improve the strength of ECC matrix and improve the interfacial properties between fiber and matrix, so as to improve the tensile properties and strain hardening ability of ECC.