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本文报导了对冻融循环作用下96个再生混凝土砖砌体抗剪试件进行的沿通缝抗剪试验。研究涉及冻融循环对再生混凝土砖砌体抗剪力学性能的影响,对比分析不同胶结材料试件的破坏形态及其抗剪强度,揭示冻融损伤对再生混凝土砖砌体抗剪强度的影响规律,并从微观角度探讨砂浆孔隙变化对砖砌体抗剪承载力的影响,建立再生混凝土砖砌体抗剪强度冻融损伤衰减模型。结果表明:砖砌体抗剪强度受冻融环境影响非常明显,其抗剪强度随冻融循环次数的增加而降低,降低的速度呈现出先慢后快的趋势;粉煤灰的加入有助于改善冻融环境下砖砌体的抗剪能力;对于石灰砂浆抗剪试件,初期的抗剪能力及冻融后的抗剪能力均下降;建立了考虑冻融损伤影响的砖砌体抗剪强度衰减模型,试验数据与计算结果吻合较好。
This paper reports the shear resistance tests of 96 regenerated concrete masonry shear specimens subjected to freeze-thaw cycles. The research involves the influence of freeze-thaw cycle on the shear resistance of recycled concrete masonry. The failure morphology and shear strength of specimens with different cemented materials are compared and analyzed. The influence of freeze-thaw damage on the shear strength of recycled concrete masonry The influences of mortar porosity changes on the shear strength of brick masonry were discussed from the microscopic point of view. The attenuation model of the shear strength of the regenerated concrete masonry was established. The results show that the shear strength of brick masonry is obviously affected by the environment of freezing and thawing, and the shear strength of brick masonry decreases with the increase of the number of freeze-thaw cycles. The decreasing speed shows the trend of slowing down and then fasting. The addition of fly ash helps Improve the shear resistance of brick masonry in freezing-thawing environment; for the shear resistance test of lime mortar, the initial shear resistance and the shear resistance after freeze-thaw decrease; the shear strength of brick masonry considering freezing-thawing damage is established Intensity attenuation model, the experimental data and calculated results agree well.