熟料中SO_3含量对低热水泥性能的影响及机理研究  

Effect of SO_3 content in cement clinker on performance of low-heat Portland cement and its mechanism

作　　者：李华 吴笑梅[2] 樊粤明[2] 

机构地区：[1]广州市建筑材料工业研究所有限公司,广东广州510663 [2]华南理工大学特种功能材料及制备技术教育部重点实验室,广东广州510641

出　　处：《水泥》2008年第5期12-15,共4页Cement

摘　　要：检测了同一温度下烧制的不同SO3含量的熟料制成的低热水泥的物理性能及水化速率,并采用岩相分析、XRD、EDS﹑化学分析方法研究了熟料中SO3含量对低热水泥熟料岩相结构﹑矿物组成、矿物晶型及矿物固溶组分的影响。结果表明,随着熟料中SO3含量的增加,水泥凝结时间显著延长,水化速率提高,7d、28d强度和水化热增大;提高熟料中SO3含量有利于A、B矿的生长和发育;熟料中SO3含量越高,早强矿物C4A3S的峰强越高,高温型B矿特征峰变窄而峰强变高,结晶程度提高;熟料中的SO3大部分固溶在硅酸盐矿物中,尤其是B矿中,SO3的引入,使A、B矿的Ca/Si增大,铝铁固溶量增多,其固溶异离子的量越多,越有利于活化阿利特晶体,稳定及活化贝利特的高温晶型,从而提高水泥的水化活性,增大水泥的后期强度。The physical property and hydration rate of low heat cement prepared by different SO3 content clinker sintered at the same temperature were studied. The effects of SO2 content in clinker on the petrographic structure, mineral composition, crystalline phase and solid solubility solution composition of clinkers were studied by means of microscope, XRD, EDS and chemical analysis. The results showed that the setting time, hydrating rate, strength of 7d and 28d as well as hydration heat increased with the increase of SO3 content in clinker, The improvement of SO3 content in clinker was helpful to growth of Mite and Belite; the higher peak of C4A3S^- related the higher SO3 content in clinker, while the feature peak of Belite became narrow and peak strength higher as well as the crystallization degree improved; the SO3 was mainly solid solved in silicate minerals especially in Belite, the Ca/Si of Mite and Belite increased caused by SO3, and the solid solved aluminium and ferrite increased. With the increase of amount of solid solved different ions, the Mite crystallization would be more activated, the crystalline phase of Belite in high temperature would be more stable and activated, thus the cement hydration activation was improved as well as the later strength.

关 键 词：SO3含量 岩相结构 异离子固溶量 矿物晶型 水化速率 

分 类 号：TQ172.736[化学工程—水泥工业]