PERFORMANCE OF REPAIR MATERIALS EXPOSED TO FLUCTUATION OF TEMPERATURE
PERFORMANCE OF REPAIR MATERIALS EXPOSED TO FLUCTUATION OF TEMPERATURE
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DOI：
10.1061/(asce)0899-1561(1995)7:1(9
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发表时间：
1995-02-01
影响因子：
3.2
通讯作者：
ALMUSSALLAM, AA
中科院分区：
文献类型：
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作者：
ALGAHTANI, AS;RASHEEDUZZAFAR;ALMUSSALLAM, AA
本研究评估了树脂和胶凝材料在静态和波动温度条件下的修复性能，这对阿拉伯海湾地区混凝土结构的修复具有重要意义。试件在25℃~ 70℃之间经历了90次热循环，模拟了阿拉伯海湾地区典型夏季混凝土表面的温度变化。在0、60和90次循环中观察了斜剪粘结强度和破坏特征。结果表明，由于混凝土与修复材料之间的热不相容，剪切斜面粘结强度随着热波动而显著降低。结果表明，对于树脂材料，60次热循环后的还原率在9.3 ~ 20.47%之间，90次热循环后的还原率在18.98 ~ 36.43%之间。对于胶凝材料，60次循环对应的数值为3.2 ~ 17.46%，90次循环对应的数值为8.07 ~ 34.80%。从总体上看，试件的破坏模式从混凝土破碎到60次循环时的破碎-节理联合破坏，再到90次循环时的明显节理破坏。
The repair performance of resinous and cementitious materials exposed to static and fluctuating temperature conditions has been evaluated in this study, which is of importance for the repair of concrete structures in the Arabian Gulf region. Specimens were exposed to a total of 90 thermal cycles between 25 degrees C and 70 degrees C, simulating the temperature variation of concrete surfaces on typical summer days in the Arabian Gulf region. The slant shear bond strengths as well as failure characteristics have been observed at 0, 60, and 90 cycles. The results show that the shear slant bond strength undergoes significant reduction with thermal fluctuations due to the thermal incompatibility between the concrete and the repair materials. It is found that for resinous materials the reduction varied from 9.3-20.47% for 60 cycles, and from 18.98-36.43% for 90 thermal cycles. For the cementitious materials, the corresponding values were 3.2-17.46% for 60 cycles, and 8.07-34.80% for 90 cycles. It is also seen, in general, that the mode of failure of the test specimens changed from crushing of concrete to combined crushing-joint failure at 60 cycles, and then to a distinct joint failure at 90 thermal cycles.