耐候试验对玻化微珠保温砂浆外保温系统黏结强度的影响

Effect of weathering test on bonding strength of glazed hollow beads thermal insulation mortar external thermal insulation composite system

随着我国建筑节能的发展,安全、绿色、经济的玻化微珠无机保温砂浆在外保温系统中的应用迅速增加,其性能研究已备受关注。为填补其在耐候性领域的研究空白,本试验通过对6组共30个试样进行轴向拉拔试验,测试玻化微珠外保温涂料系统在耐候试验不同循环次数下的系统拉伸黏结强度和抹面层与保温层拉伸黏结强度,得到黏结强度变化规律,揭示黏结强度损伤机理。结果表明:随着耐候试验循环次数的增加,黏结强度逐步降低;热冷循环比热雨循环对黏结强度的影响更大;系统的黏结强度始终低于抹面层与保温层的黏结强度,二者最终强度均大于0.1 MPa,满足规范要求。

The application of glazed hollow beads thermal insulation mortar （GHBTIM） in the external thermal insulation composite system（ ETICS ）, as an energy efficient and incombustible inorganic material, is rapidly increasing.The performance of GHBTIM has re- ceived extensive attention.To supplement the research in this area our study analyzes 30 specimens in 6 groups.After undergoing different weathering test cycles, pull-off tests of the samples were done to measure their bond strength of the ETICS as well as between the render- ing system and insulation layer.The change rule of bond strength was obtained and the damage evolution mechanism of bond strength was revealed.The results show that the bond strength of glazed hollow beads thermal insulation mortar ETICS gradually decreases with the in- creasing of cycles.The degradation of bond strength is more susceptible in the heating-cooling cycle than heating-rainning cycle.The bond strength of the ETICS is lower than that between the rendering system and insulation layer during the entire weathering test, and the bond strength of both is higher than 0.1MPa which is required by the standard.