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在地聚合物体系中,反应产物会随原材料化学组成与激发条件的不同产生巨大差异,钙掺杂地聚合物的反应机理、产物组成与结构更为复杂。试验采用5种外加晶体钙源和2种非晶体外加钙源以不同比例与偏高岭土复掺制备地聚合物,研究了外加钙源对地聚合物性能和反应机制的影响。研究表明:外加钙源中Si、Al的溶出量与钙源的结构有关,Si和Al的溶出量之间存在很强的正相关性,而Ca与Si、Al的溶出量之间不存在相关性。外加钙源会降低偏高龄土基地聚合物体系的抗压强度,掺杂非晶体钙源地聚合物的抗压强度均大于掺杂晶体钙源的。外加钙源中Ca的溶出量与抗压强度之间存在负相关性。本研究为拓宽地聚合物原材料的来源和资源化利用含钙工业固体废弃物研制复合地聚合物提供了理论和试验依据。
In geopolymer systems, the reaction products vary widely depending on the chemical composition and the excitation conditions of the raw materials. The reaction mechanism and product composition and structure of the polymer doped with calcium are more complicated. In this experiment, five kinds of additional calcium source and two kinds of non-crystal plus calcium source were used to prepare geopolymer with different proportions of metakaolin. The effects of calcium source on the properties and reaction mechanism of geopolymer were studied. The results show that the amount of Si and Al dissolved in the calcium source is related to the structure of the calcium source, and there is a strong positive correlation between the amount of Si and Al dissolved. However, there is no correlation between the amount of dissolved Si and Al Sex. The addition of calcium source will decrease the compressive strength of polymer systems in the basement of over-age soil. The compressive strength of polymer doped with amorphous calcium source is higher than that of doped crystal calcium source. There was a negative correlation between Ca dissolution and compressive strength in calcium source. This study provides theoretical and experimental basis for broadening the sources and resources of geopolymer materials and developing composite polymers with industrial solid wastes containing calcium.