玻化微珠保温砂浆劣化机理及对结构耐久性的影响研究

Through the study of the fireproof inorganic thermal insulation material- - glazed hollow bead thermal insulation mortar ,combining with the organization of standards and engineering application, the problem of durability that this material and its thermal insulation system desiderate to be developed and researched is put forward.It will be developed from the material deterioration mechanism, the weather resistance and durability of thermal insulation system as well as the corrosion damage and thermal stability of structure by taking a method of combining with macroscopical experiment ,microscopic observation and simulation analysis.On the aspect of material research,the relationship between the damage mechanism , degradation regularity and microstructure of glazed hollow bead thermal insulation mortar is to be researched by the durability test and microstructure analysis under the condition of single factor and multi-factors coupling.In the system research, the system security durability will be confirmed by the study of the variation law of the system bond strength and the stress calculation.Meanwhile its applicable durability is to be confirmed by the performance analysis of the condensation, crack resistance, waterproof and breathability of the thermal insulation system.On the aspect of wall structural research,the transmission behavior of erosion medium in the mortar and its influence on structural materials are to be researched through experiments.While, the influence on the structure about the location of the thermal insulation system and tectonic settings will be confirmed by a study on temperature field , thermal stress of the wall through simulation analysis.The study will provide any advice for durability design through the establishment of insulating mortar lifetime prediction model, so as to improve the security, durability and actual energy saving effect of inorganic heat preservation and energy saving system.

选择防火型无机保温材料- - 玻化微珠保温砂浆为研究对象，结合标准编制及工程应用，提出该材料及保温体系亟需发展与研究的耐久性问题。采用宏观试验、微观观测与模拟分析相结合的方法，从材料劣化机理、保温系统耐候耐久性、结构侵蚀破坏及热稳定性三方面展开研究。在材料方面，选定多种单一因素及多因素耦合，对玻化微珠保温砂浆进行耐久性试验及微观形貌分析，研究其损伤机理与退化规律与微观结构之间的关系。系统研究方面，通过系统粘结强度变化规律及应力计算确定系统安全耐久性；通过对保温系统的结露、抗裂、防水、透气等性能分析来确定其适用耐久性。墙体结构方面，通过试验研究侵蚀性介质在砂浆内的传输行为及对结构材料的影响，通过模拟分析研究墙体温度场、温度应力及其变化规律，确定保温体系位置及构造设置对建筑结构的影响。通过研究建立保温砂浆寿命预测模型，为其耐久性设计提供依据，以提高无机保温节能系统的安全性、耐久性和实际节能效果。

玻化微珠保温砂浆实现了防火与保温之间的平衡。本项目选择其为研究对象，结合标准编制及工程应用，研究了该材料及保温体系亟需发展与研究的耐久性问题。采用宏观试验、微观观测与模拟分析相结合的方法，从材料劣化、保温系统耐候耐久性、结构侵蚀破坏及热稳定性三方面展开研究。主要研究内容及结果：.（1）材料方面，考虑其使用条件的环境因素，开展了多种因素影响下的耐久性试验和微观分析。得出了冻融、碳化、侵蚀性介质等因素影响下材料劣化发展规律，确定了材料对于不利自然条件及侵蚀介质的承受能力，揭示其耐久性与材料组成、原材料性能、细（微）观结构之间的定量关联及劣化机理。.（2）开展了玻化微珠外墙外保温系统耐候性试验研究，并对墙体结构层的温度及应变情况进行监测，比较分析其不同循环次数下的变化规律。研究表明墙体试样饰面层、保温层、基层的温度变化剧烈程度依次递减，不利气候条件下保温系统的保温隔热效果并无明显下降。耐候性试验中墙体饰面层与基层总体上的变形特征表现为“热胀冷缩”；而保温层因膨胀量较大在热雨循环中表现为“热缩冷胀”，热冷循环中不同位置的变形特征各不相同。.（3）通过对保温系统的结露、抗裂等性能分析来确定其适用耐久性，确定了工程适用的保温系统优化设计方法，为提高保温系统适用耐久性提供依据。.（4）通过试验确定不利气候条件下结构+保温系统组合试件耐久性特征，研究侵蚀性介质通过玻化微珠保温砂浆层的传输行为，分析其对墙体材料的保温性影响及可能存在的侵蚀破坏作用。.（5）通过模拟计算分析墙体结构热稳定性及变化，确定墙体温度场、温度应力及其变化规律，分析不利自然条件对结构温度场和温度应力的影响， .本项目完成了计划研究内容。研究可以为节能及结构设计优化提供依据，有助于提高节能建筑的安全性、耐久性和节能效果。