偏硅酸钠掺量对高硼废液水泥固化体力学性能的影响  

Effect of Sodium Metasilicate Addition on Mechanical Properties of High-Concentration Boron Waste Cement Solidified Boby

作　　者：华婉苏 马浩森 姜雨杭 李秋[1] HUA Wansu;MA Haosen;JIANG Yuhang;LI Qiu(State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,China;School of Materials Science and Engineering,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学硅酸盐建筑材料国家重点实验室,武汉430070 [2]武汉理工大学材料科学与工程学院,武汉430070

出　　处：《硅酸盐通报》2020年第10期3260-3266,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金面上项目(52072279);国家自然科学基金委国际(地区)合作与交流项目(中欧)(51611530545)。

摘　　要：为研究偏硅酸钠掺量对高硼废液水泥固化体力学性能的影响,测试了3%、5%、7%(质量分数)碱当量下水泥固化体的抗压强度,采用量热实验、XRD、FT-IR、TG-DSC、SEM等分析技术,对水化产物建立起宏观性能和微观结构的联系,探究力学性能变化的微观机理。实验结果表明:对于普硅水泥-高硼溶液体系,以偏硅酸钠为激发剂,相同龄期下,随着碱当量的增加,试样的抗压强度随之增加;碱当量为5%以上时,试样的各龄期抗压强度可显著提高,28 d抗压强度达10.36 MPa以上。碱当量的增加使得水化产物中的氢氧化钙增多,从而填充了水泥固化体中的空隙,使其强度提高;产物中的C-S-H凝胶是固化体抗压强度的主要来源。The effect of sodium metasilicate addition on the mechanical properties of high-concentration boron waste cement solidified body were assessed by the compressive strength of cement solidified body with addition of sodium metasilicate at alkali equivalents of 3%,5%and 7%(mass fraction).Calorimetry,XRD,FT-IR,TG-DSC,SEM and other analytical techniques were employed to establish the relationship between the macro-performance and the microstructure of hydration products so as to understand the changes in mechanical properties.The experimental results show that the compressive strength of the sample increases with the alkali equivalent in Portland cement-high-concentration boron solution system,with sodium metasilicate as activator at the same curing age.When the alkali equivalent is above 5%,the compressive strength of samples is significantly improved and reaches 10.36 MPa at 28 d.The addition of alkali equivalent increases the amount of calcium hydroxide in the hydration products,resulting in filling the voids and increasing the compressive strength of cement solidified body.C-S-H gel is the main source of the compressive strength of cement solidified body.

关 键 词：硅酸盐水泥 偏硅酸钠 碱当量 抗压强度 氢氧化钙 偏硼酸钙 C-S-H凝胶 

分 类 号：TL941[核科学技术—辐射防护及环境保护]