碱激发锌渣胶凝材料设计制备与微观结构分析  

Design and Microstructure Analysis of Alkali-activated Zinc Slag Cementitious Materials

作　　者：徐县 康晶 蔡新华[1] 王维康 XU Xian;KANG Jing;CAI Xinhua;WANG Weikang(State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室,武汉430072

出　　处：《材料导报》2022年第22期230-236,共7页Materials Reports

基　　金：长江勘测规划设计研究院开放创新基金项目(CX2020K05);国家自然科学基金(51579195)。

摘　　要：基于对锌渣固体废弃物的再利用,本工作以锌渣为原材料制备碱激发锌渣胶凝材料,采取正交试验研究了化学激发下液固比、水玻璃模数及水泥掺量三个因素对碱激发锌渣胶凝材料体系力学性能的影响,并利用XRD和SEM等方法分析了碱激发锌渣胶凝材料体系的微观结构,同时在优选配比基础上探究了温度和比表面积对碱激发锌渣胶凝材料体系的影响规律,最后分析了碱激发锌渣胶凝材料对锌离子的固化能力。结果表明:碱激发锌渣胶凝材料体系的抗压强度受水泥掺量影响最大,其次是液固比和水玻璃模数;试验中水泥掺量10%(质量分数)、液固比0.2、水玻璃模数0.8为最优配合比,所得材料的28 d抗压强度可达56.5 MPa,物理激发中采用蒸养方式和增大锌渣粉比表面积方式可提高其早期强度;碱激发锌渣胶凝材料的水化产物是以C-(A)-S-H凝胶为主的非晶凝胶相,属于α-C-S-H型凝胶,其致密的三维结构不仅对强度有积极作用,还有较好的固化Zn^(2+)的能力,这为锌渣的二次利用提供了新的思路。Taking zinc slag as raw material,this work prepared alkali-activated zinc slag cementitious material,based on the reuse of zinc slag solid waste.The orthogonal test was adopted to study the influence of ratio of liquid to solid,water glass modulus and cement content on the mechanical properties of alkali-activated zinc slag cementitious material system.And then,we analyzed the microstructure of alkali-activated zinc slag cementitious materials with different mixing ratios and explored the effects of temperature and specific surface area based on the optimal ratio by XRD and SEM.Finally,we tested the curing ability of alkali-activated zinc slag cementitious material to the zinc ion.The results show that the compressive strength of alkali-activated zinc slag cementitious material system is most affected by cement content,followed by ratio of liquid to solid and water glass modulus.In this study,under the condition of the cement content 10%,the ratio of liquid to solid 0.2,and the water glass modulus 0.8,the optimum mixing ratio is obtained,and the 28 d compressive strength can reach 56.5 MPa.In addition,the physical methods of steam curing and increasing the specific surface area of zinc slag powder can improve the early strength.The hydrated product of alkali-activated zinc slag cementitious materials is an amorphous gel phase mainly composed of C-(A)-S-H gel,which belongs toα-C-S-H gel.Its dense three-dimensional structure not only provides a positive effect for strength,but also has a good ability to solidify Zn^(2+),which provides a new way for the second utilization of zinc slag.

关 键 词：锌渣 正交试验 抗压强度 碱激发材料 微观结构 固化离子 

分 类 号：TU528[建筑科学—建筑技术科学]