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不同憎水剂及骨粉比无机保温砂浆的耐冻融性能
作者：汤立杰
[上海市建筑科学研究院（集团）有限公司，上海 200032]
摘要：从宏观、微观角度研究了在冻融条件下不同憎水剂及骨粉比的无机保温砂浆的性能变化规律，并深入分析了耐冻融的影响因素和提升技术。结果表明：无机保温砂浆骨粉比越高，抗压强度越低。1 h内无机保温砂浆的吸水量基本可达到饱和，不同憎水剂的憎水效果差异较大。初始强度越高无机保温砂浆越密实，吸水率越低，抵抗冻融应力的能力越大。憎水剂掺量影响无机保温砂浆的抗压强度，耐冻融性能随吸水率降低呈现先提高后降低的趋势。扫描电镜分析显示，冻融后无机保温砂浆样品孔隙内微裂纹数量增多，孔隙内及附近针状晶体数量增多，尺寸明显增大，可间接表明其冻融劣化原因。
关键词：骨粉比；憎水剂；冻融循环；影响因素；吸水率
中图分类号：TU111.4+1 文献标识码：A 文章编号：1001-702X（2018）03-0122-05
Study on the resistance to freezing and thawing property of inorganic insulation mortar with different ratios of aggregate and powder as well as water repellent
TANG Lijie
[Shanghai Institute of Building Sciences（Group） Co. Ltd.，Shanghai 200032，China]
Abstract：The performance variation and influence factors of its resistance to freezing and thawing as well as the improvement technology are studied in this paper from macro and micro angle. The results show that the higher the ratio of aggregate and powder，the smaller the compressive strength. The water absorption of one hour of inorganic thermal insulation mortar is basically saturated，and the water repellent effect of different water repellent is quite different. The higher the initial strength，then the larger density and the lower water absorption ratio of the inorganic thermal insulation mortar，the ability to resist the freezing and thawing stress is greater. The content of water repellent will affect the compressive strength of the inorganic thermal insulation mortar，and the resistance to freezing and thawing increases first and then decreases with the decrease of water absorption. Scanning electron microscopy analysis showed that the number of microcracks in the pores of inorganic insulation mortar increased after freezing thawing，and the number of acicular crystals increased and the size increased significantly，which can indirectly indicate the reasons for the deterioration of the freezing and thawing.
Key words：ratio of aggregate and powder，water repellent，freezing thawing cycles，influence factor，water absorption ratio