化学活化剂对铬铁渣水泥复合材料力学性能及水化的影响  

Effect of chemical activator on mechanical properties and hydration of ferrochrome slag cement composites

作　　者：朱宁杰 李俊华[1] ZHU Ningjie;LI Junhua(Faculty of Architectural, Civil Engineering and Environment, Ningbo University, Ningbo 315211, China)

机构地区：[1]宁波大学建筑工程与环境学院

出　　处：《功能材料》2019年第9期9192-9196,共5页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51178226);国家重点实验室开放基金资助项目(2011KB24)

摘　　要：以工业废弃物铬铁渣替代不同比例的水泥,并添加不同含量的KCl作为化学活化剂,成功制备了铬铁渣水泥复合材料。分析了铬铁渣掺量及KCl添加量对铬铁渣水泥复合材料抗压强度的影响,并利用傅里叶红外光谱、扫描电子显微镜、热重-差热分析等方法对不同水泥复合材料的样品进行了测试。结果表明,10%(质量分数)铬铁渣掺杂具有较好的抗压强度,且符合Cr^6+排放标准;0.6%(质量分数)的KCl加入到10%(质量分数)铬铁渣含量的水泥复合材料中,抗压强度最高,养护7,28和90 d后抗压强度分别为46.13,67.45和78.98 MPa;化学活化剂KCl的加入加速了钙矾石和C-S-H凝胶的形成,有利于提高水泥复合材料的致密性,同时化学活化剂中的氯离子可与水泥复合材料中粉煤灰提供的活性Al2O3反应生成水铝钙石,促进了熟料的水合作用,提高了水泥复合材料的早期强度和耐久性。The ferrochrome slag cement composites were successfully prepared by replacing different proportion of cement with industrial waste ferrochrome slag and adding different content of KCl as chemical activator. The influence of the content of ferrochrome slag and KCl on the compressive strength of ferrochrome slag cement composites was analyzed. The samples of different cement composites were tested by Fourier transform infrared spectroscopy, scanning electron microscopy and thermogravimetric-differential thermal analysis. The results showed that 10 wt% ferrochrome slag had better compressive strength and met the Cr^6+ emission standard. The addition of 0.6 wt% KCl to the 10 wt% ferrochrome slag cement composite material had the highest compressive strength, and the compressive strength was 46.13, 67.45 and 78.98 MPa after curing 7, 28 and 90 d, respectively. The addition of the chemical activator KCl accelerated the shape of ettringite and C-S-H gel. At the same time, chloride ion in chemical activator could react with active Al2O3 provided by fly ash in cement composites to form diaspore, which promoted hydration of clinker and improved early strength and durability of cement composites.

关 键 词：化学活化剂 铬铁渣 水泥复合材料 水化过程 

分 类 号：TU528[建筑科学—建筑技术科学]