矿渣改性碱激发硅锰渣胶凝材料的宏观性能与微观特性研究  

Macroscopic Properties and Microscopic Properties of Slag-Modified Alkali-Activated Silicon-Manganese Slag Cementitious Materials

作　　者：苏壮飞 程尧 刘泽[3] SU Zhuangfei;CHENG Yao;LIU Ze(School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China;CHALCO Zhongzhou Aluminum Co,Ltd.,Jiaozuo 454171,China;School of Chemical and Environmental Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]河南理工大学材料科学与工程学院,焦作454003 [2]中铝中州铝业有限公司,焦作454171 [3]中国矿业大学(北京)化学与环境工程学院,北京100083

出　　处：《硅酸盐通报》2025年第4期1276-1287,共12页Bulletin of the Chinese Ceramic Society

基　　金：河南理工大学博士基金(B2023-20);河南理工大学创新型科研团队资助项目(T2023-5)。

摘　　要：作为新进大宗工业固废,硅锰渣的无害化处置与大规模资源化利用的问题亟需解决。本文采用硅锰渣为前驱体,以水玻璃作为碱激发剂来制备碱激发硅锰渣胶凝材料,研究了水玻璃掺量、水玻璃模数及矿渣改性对碱激发硅锰渣胶凝材料宏观性能与微观特性的影响。结果表明,在90 d龄期内,碱激发硅锰渣反应持续进行,凝胶产物聚合度逐渐增高且产量增加,硬化浆体孔隙率降低、力学性能增强。随着水玻璃模数降低,碱激发早期反应增强,反应放热量增加,凝结时间变短,硬化浆体力学性能增强。但过低的水玻璃模数不利于碱激发后期反应,在水玻璃模数为1.2、掺量为12%(质量分数,下同)时,碱激发硅锰渣胶凝材料的力学性能最佳,28与90 d强度分别达到86.0与100.1 MPa。掺入矿渣可明显改善碱激发硅锰渣胶凝材料早期力学性能差的劣势,但掺量过高会导致碱激发反应过快,硬化浆体收缩开裂,矿渣最佳掺量为10%。As a new type of bulk industrial solid waste,the harmless disposal and large-scale resource utilization of silicon-manganese slag urgently need to be addressed.In this study,silicon-manganese slag was used as precursor and water glass as alkaline activator to prepare alkali-activated silicon-manganese cementitious material.The effects of water glass content,water glass modulus,and slag modification on the macroscopic properties and microscopic properties of alkali-activated silicon-manganese slag cementitious material were investigated.The results show that,within a curing period of 90 d,the alkali activation of silicon-manganese slag cementitious material continues,with the polymerization degree and yield of gel products gradually increasing.The porosity of hardened paste decreases,and the mechanical properties are enhanced.With the devrease of water glass modulus,the early-stage alkali activation reaction is strengthened,the heat release increases,the setting time shortens,and the mechanical performance of hardened paste improves.However,excessively low water glass modulus hinders the later-stage alkali activation.The best mechanical performance of alkali-activated silicon-manganese slag cementitious material is achieved when the water glass modulus is 1.2 and the water glass content is 12%(mass fraction),with strengths of 86.0 and 100.1 MPa at 28 and 90 d,respectively.The incorporation of slag significantly improves the poor early-stage mechanical performance of alkali-activated silicon-manganese slag cementitious material,but excessive addition leads to too rapid alkali activation,causing shrinkage cracks in hardened paste.The optimal slag content is 10%.

关 键 词：硅锰渣 碱激发 强度 水玻璃掺量 水玻璃模数 矿渣改性 

分 类 号：TU526[建筑科学—建筑技术科学]