硅灰改性氯氧镁水泥机理的研究

Study of Siliceous Ash Doped Cl - O - Mg Cement

测定了掺硅灰氯氧镁水泥的强度和抗水性.采用XRD、DTA、SEM和EDAX等测试手段对硅灰增强氯氧镁水泥尤其是后期强度以及改善其抗水性的机理进行了研究.结果发现,适量硅灰的掺入.使得在氯氧镁水泥硬化体中有一部分水化硅酸镁凝胶生成.且5·1·8的结构、形态得以改善.所生成的5·1·8凝胶既有较好的水稳定性又具有较高的密实度,此外5·1·8与Mg(OH)_2的相匹配也趋于合理,以致氯氧镁水泥改性.

The mechanism for improving the strength and water resistance of Si ash doped Cl-O-Mg cement was studied by XRD,DTA,SEM and EDAX. It has been found that the addihon of suitable amount of Si ash resulted in the formation of some hydrated MgSiO3 gel in the hardened cement, and the structure, morphology of 5 · 1·8 was improved. The gel formed had good water resistance and high density. In addition, the match between 5 · 1 · 8 and Mg(OH)2 tended to be reasonable so that the Cl-O-Mg cement was modified.