水泥基渗透结晶型防水涂料活性物质研究

Study on the Active Substance in Cement-Based Permeable Crystalline Waterproof Coatings

通过研究不同类型活性物质对水泥基体吸水率、力学性能的影响,对水泥基渗透结晶型防水涂料的活性物质进行了初步筛选,采用SEM、纳米压痕等测试手段对水泥基体的微观形貌、微观力学性能进行分析,从微观结构探讨其机理。结果表明:涂覆正硅酸乙酯、硫酸钠、六偏磷酸钠、羟丙基甲基纤维素、碳酸钠等活性物质饱和水溶液的水泥砂浆基体吸水率相较基准样低,防水性能较好,48 h吸水率分别为40. 44%、48. 24%、49. 69%、50. 79%、66. 46%;涂覆正硅酸乙酯、硫酸钠等物质的水泥试样表面结构更加密实,而涂覆柠檬酸的试样表面结构较松散。

By studying the influence of different kinds of active substances on the water absorption and mechanical properties of cement matrix,the active substances of cement-based permeable crystalline waterproofing coating were screened. The microstructure and hydration degree of cement matrix were analyzed by means of SEM,nano-indentation and other modern testing methods. The results showed that the water absorption rate of the cement morter substance coated with saturated aqueous solution containing active substances such as ethyl orthosilicate,sodium sulfate,sodium hexametaphosphate,hydroxypropyl methyl cellulose and sodium carbonate was low,compared to the benchmark sample,their water absorption rate after 48 h was 40. 44%,48. 24%,49. 69%,50. 79% and 66. 46%,respectively. The surface structure applied with active substances,such as ethyl orthosilicate and sodium sulfate were more compact,while those coated withcitricacidwerelooser.