Thermal stability, pore structure and moisture adsorption property of phosphate acid-activated metakaolin geopolymer
Thermal stability, pore structure and moisture adsorption property of phosphate acid-activated metakaolin geopolymer
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DOI：
10.1016/j.matlet.2021.130226
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发表时间：
2021-10
影响因子：
3
通讯作者：
Hui Lin;Hui Liu;Yue Li;X. Kong
中科院分区：
文献类型：
--
作者：
Hui Lin;Hui Liu;Yue Li;X. Kong
采用两步固化法成功制备了磷酸活化偏高岭土地质聚合物（PMG），并利用热重分析（TG）、压汞法（MIP）和动态水蒸气吸附仪（DVS）研究了PMG的热稳定性、孔结构和吸湿性能。TG结果表明，PMG的热分解主要发生在220 - 550 ℃范围内，远高于普通粘结剂C-S-H的热分解温度，这是由于PMG的化学键合水被除去，PMG的含水量约为16%。MIP测量表明PMG的孔隙率为13.6%，最可几孔径约为100 nm。DVS测试结果表明，PMG粉体的吸水量约为0.132ml/g，与MIP测试的总孔隙率基本一致。
Phosphate acid-activated metakaolin geopolymer (PMG) was successfully prepared using a two-step curing method and the thermal stability, pore structure and moisture adsorption property of the obtained PMG were studied by techniques of thermogravimetry (TG), mercury intrusion porosimetry (MIP) and dynamic vapor sorption meter (DVS). TG result shows that thermal decomposition of the PMG majorly occurs in the range of 220−550 ℃, much higher than that of the common binder of C-S-H, due to the removal of the chemically bonded water and the water content of the PMG is around 16%. MIP measurement indicates that the porosity of the PMG is 13.6% and the most probable pore size is about 100 nm. DVS results shows that the water adsorption amount of PMG powder is about 0.132 ml/g, which is in good agreement with the total porosity measured by MIP test.