[Si(Al)O4]四面体聚合度对Na+固化性能的影响
Influence of [Si(Al)O4] Polymerization Degree on Solidification of Na+
摘 要
运用核磁共振分析手段(NMR),采用结构分析的方法研究了赤泥基胶凝材料的水化过程,探讨了[Si(Al)O4]四面体聚合度对Na+固化性能的影响.结果表明:当原料中硅以SiQ0、SiQ1等低聚合度形式存在时,由于低聚合度的[Si(Al)O4]四面体易在早期发生解聚,并在富含Ca2+的溶液中发生反应生成钙硅比较高的C-S-H凝胶,这不利于Na+的固化;当硅主要以SiQ2、SiQ3等中聚合度形式存在时,由于水化后期[Si(Al)O4]四面体的逐渐解聚和铝对硅的取代作用,促进了低钙硅比的(Na,Al)-C-S-H凝胶的生成,改善了Na+的固化性能;而在硅主要以SiQ4高聚合度形式存在时,又不利于Na+固化.
固化
取代
煤矸石
red mud
solidification
substitution
gangue
Abstract
Using structural analysis methods,the hydration process of cementitious materials and the effect mechanism of the polymerization degree of [Si(Al)O4] on the solidification of Na+ during hydration process were studied.The results indicate that the [Si(Al)O4] polymerization degree in raw materials had a remarkable influence on the solidification of Na+.When Si existed in the form of SiQ0 and SiQ1,it depolymerized in the early stage of hydration process,and then reacted with Ca2+ in the solution to form high Ca/Si C-S-H gel.When Si existed in the form of SiQ2 and SiQ3,it was depolymerized mainly in the late stage of hydration process,then Al readily entered the [Si(Al)O4] tetrahedral sites and made the hydration into low Ca/Si (Na,Al)-C-S-H gel,which was more useful for the solidification of Na+.When Si existed in the form of SiQ4,it was not useful for the solidification of Na+.
中图分类号 TF12
所属栏目 新材料 新工艺
基金项目 国家自然科学基金资助项目(50674062)
收稿日期 2008/5/15
修改稿日期 2008/10/15
网络出版日期
作者单位点击查看
备注孙文标(1971-),男,河南巩义人,讲师,博士.
引用该论文: SUN Wen-biao,FENG Xiang-peng. Influence of [Si(Al)O4] Polymerization Degree on Solidification of Na+[J]. Materials for mechancial engineering, 2009, 33(6): 40～44
孙文标,冯向鹏. [Si(Al)O4]四面体聚合度对Na+固化性能的影响[J]. 机械工程材料, 2009, 33(6): 40～44
被引情况:
【1】马壮,陶莹,杨杰,张莉,李智超, "以煤矸石为渗硅剂在工业纯铜表面制备渗硅层的冲蚀磨损性能",机械工程材料 38, 71-75(2014)
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【3】HONG S Y,GLASSER F P.Alakli sorption by C-S-H and C-A-S-H gels part II.Role of alumina[J].Cement and Concrete Research,2002,32(7):1101-1111.
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【7】RICHARDSON I G.The nature of the hydration products in hardened cement pastes[J].Cement & Concrete Composites,2000,22:97-113.
【8】MEHTA R K,YANG M K M.Application of fly ash in the agglomeration of reactive mine tailings[J].Journal of Hazardous Materials,1996,51(3):181-192.
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