冻融循环作用下再生混凝土砖砌体通缝受剪试验研究

发布时间：2018-04-13 09:57

本文选题：冻融环境 + 再生混凝土砖砌体　；参考：《实验力学》2015年06期

【摘要】：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。
[Abstract]:In this paper, the shear tests of 96 recycled concrete brick masonry specimens subjected to freeze-thaw cycles are reported.The influence of freeze-thaw cycle on the shear mechanical properties of recycled concrete brick masonry is studied. The failure modes and shear strength of the specimens of different cemented materials are compared and analyzed, and the influence of freeze-thaw damage on the shear strength of recycled concrete brick masonry is revealed.The influence of mortar pore change on the shear capacity of brick masonry is discussed from the microcosmic point of view, and the model of freezing and thawing damage attenuation of recycled concrete brick masonry is established.The results show that the shear strength of brick masonry is obviously affected by freeze-thaw environment, and the shear strength decreases with the increase of freeze-thaw cycle times, and the decreasing speed shows a tendency of slow first and then fast.The addition of fly ash can improve the shear resistance of brick masonry in freeze-thaw environment, but for lime mortar, the initial shear resistance and the freezing and thawing shear resistance are decreased.The shear strength attenuation model of brick masonry considering the effect of freeze-thaw damage is established. The experimental data are in good agreement with the calculated results.
【作者单位】：东北电力大学建筑工程学院;西安建筑科技大学土木工程学院;长安大学地质工程与测量学院;
【基金】：国家科技支撑计划(2013BAJ08B03)资助东北电力大学博士科研启动资金项目(BSJXM-201518)
【分类号】：TU364

【共引文献】