机械活化对碳酸钠激发矿渣胶凝材料早期性能的影响  

Effect of Mechanical Activation on Early-Age Performance of Sodium Carbonate-Activated GBFS Binders

作　　者：胡凯伟 陈轩 李廷锋 张俊杰 高璇 杨涛[2] HU Kaiwei;CHEN Xuan;LI Tingfeng;ZHANG Junjie;GAO Xuan;YANG Tao(Jiangsu Bositong New Material Co.,Ltd.,Nanjing 211806,China;School of Materials Science and Engineering,Yancheng Institute of Technology,Yancheng 224051,China)

机构地区：[1]江苏博思通新材料有限公司,南京211806 [2]盐城工学院材料科学与工程学院,盐城224051

出　　处：《硅酸盐通报》2024年第7期2577-2583,共7页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金青年基金(51702278);江苏省自然科学基金青年基金(BK20170476);江苏省“青蓝工程”优秀青年骨干教师。

摘　　要：针对碳酸钠激发矿渣胶凝材料凝结时间长、早期强度发展慢的问题,本文采用机械力活化手段处理粒化高炉矿渣来加速碱激发反应进程,研究磨细矿渣对胶凝材料凝结时间、强度发展、反应放热及产物组成的影响。结果表明:机械活化可加速矿渣中Ca^(2+)、SiO_(4)和AlO_(4)^(-)等离子基团的溶解释放,以促进碳铝酸钙矿相产物的生成;Ca^(2+)的加速溶出有助于消耗液相中的CO_(3)^(2-),胶凝材料初终凝时间由23.6、30.5 h分别缩短至2.3和3.2 h;机械活化缩短了碱激发矿渣的诱导期,有效提高了碱激发反应程度,96 h内碱激发反应放热总量由41.30 J/g增至55.47 J/g;机械活化促进了水化铝硅酸钙凝胶相的生成,致密了胶凝材料孔结构,总孔隙率由30.49%降低至27.01%,粗毛细孔由17.69%降低至2.32%。硬化体28 d抗压强度高达36.58 MPa,相比基准组试样提升了230%。In response to the problem of long setting time and slow early strength development of sodium carbonate-activated ground blast furnace slag(GBFS)binders,the mechanical activation was adoptd to treat granulated blast furnace slag for accelerating the alkali-activation process.The effect of mechanical activation on the setting time,strength development,reaction kinetics and phase evolution of binders were investigated.The results show that mechanical activation can accelerate the dissolution and release of Ca^(2+),SiO_(4) and AlO_(4)^(-) in slag to promote the formation of calcium carboaluminate mineralogical phases.Accelerated dissolution of Ca^(2+)is beneficial for consuming CO_(3)^(2-) in the liquid phase,and the initial and final setting time of binders decreases from^(2)3.6 and 30.5 h to 2.3 and 3.2 h,respectively.At the same time,the induction period of alkali-activation is shortened using mechanical activation,the degree of alkali-activation is effectively improved,and the total heat release within 96 h increases from 41.30 J/g to 55.47 J/g.The formation of calcium aluminosilicate hydrate gel phase is promoted,which densifies the pore structure,reduces the total porosity from^(3)0.49%to 27.01%,and reduces the macro-capillary porosity from 17.69%to 2.32%.The 28 d compressive strength of binders achieves 36.58 MPa,which increases to 230%compared with the reference sample.

关 键 词：碱激发矿渣 碳酸钠 机械活化 凝结时间 抗压强度 

分 类 号：TQ172[化学工程—水泥工业]