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无机保温材料玻化微珠保温砂浆实现了保温隔热性能与系统防火安全性的平衡,近年来在内外保温系统上的应用迅速增加,其在外界环境作用下的性能稳定性及劣化机理也受到了关注。为研究其抗碳化性能,选定保温砂浆的最优配合比,进行了不同碳化龄期的室内快速碳化试验,测定碳化后的基本性能指标导热系数、抗压强度;对碳化前后的保温砂浆试块进行X-Ray衍射试验和微观形貌分析,研究其变化规律,进一步揭示保温砂浆的碳化机理。试验结果表明:相同碳化龄期下,“保温砂浆+抗裂砂浆”保温系统的碳化深度比保温砂浆小20%,保温系统的抗碳化能力优于保温砂浆;碳化前期(0~7 d),保温砂浆的导热系数和抗压强度增大较快,随着碳化龄期的增大,导热系数的变化率由最初的3.64%降低为2.68%,抗压强度的变化率由最初的12.08%降低为9.14%,28 d碳化作用后,导热系数和抗压强度相较于碳化前分别增大了8.55%和29.38%;保温砂浆碳化后的产物主要是CaCO_3,孔隙中Ca~+离子的析出,主要由Ca(OH)_2分解补偿。
Inorganic Insulation Materials Vitrified micro-bead insulation mortar to achieve thermal insulation properties and fire safety system balance, in recent years, the rapid increase in the application of internal and external thermal insulation system, its performance under the external environment, the stability and deterioration of the mechanism is also subject to Concerned. In order to study its carbonation resistance, the optimal blending ratio of thermal insulation mortar was selected. The rapid indoor carbonization test with different carbonation age was conducted to determine the thermal conductivity and compressive strength of carbonized basic performance index. The thermal insulation mortar before and after carbonization X-ray diffraction test and micro-morphology analysis of the block were carried out to study the variation rules of the block and further reveal the carbonization mechanism of the thermal insulation mortar. The results show that under the same carbonation age, the carbonization depth of the “thermal insulation mortar + anti-cracking mortar” insulation system is 20% less than the thermal insulation mortar, and the carbonation resistance of the thermal insulation system is better than that of the thermal insulation mortar; ), The thermal conductivity and compressive strength of thermal insulation mortar increased rapidly. With the increase of carbonation age, the thermal conductivity decreased from 3.64% to 2.68%, and the change rate of compressive strength from the initial 12.08 % Decrease to 9.14%. After 28 days of carbonization, the thermal conductivity and compressive strength increased by 8.55% and 29.38% respectively compared with those before carbonization. The products after carbonization of the thermal insulation mortar are mainly CaCO_3, Ca ~ + ions in the pores Precipitation, mainly by the decomposition of Ca (OH) _2 compensation.