高铁低钙硅酸盐水泥体系的抗氯离子侵蚀性能研究  

Resistance to Chloride Ion Erosion of High-Iron Low-Calcium Silicate Cement

作　　者：朱明[1] 曾浪 饶美娟 ZHU Ming;ZENG Lang;RAO Mei-juan(State Key Laboratory of Silicate Materials for Architectures,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

出　　处：《硅酸盐通报》2018年第10期3136-3140,共5页Bulletin of the Chinese Ceramic Society

基　　金："十三五"国家重点研发项目(2016YFB0303501);国家自然科学基金青年基金(51709209)

摘　　要：为了改善水泥基材料的抗氯离子侵蚀性能,提出高铁低钙硅酸盐水泥体系[C4AF≥18%,C3S≤50%,层状双氢氧化物材料(LDHs)]。分别制备了矿相组成为(18%C4AF,50%C3S)及(20%C4AF,48%C3S)的高铁低钙水泥熟料,探讨了高铁低钙水泥熟料的烧成制度和材料特性;测试了硬化高铁低钙水泥浆体的3、7、28 d抗压强度及28 d氯离子扩散系数,研究了0%～8%掺量的LDHs对高铁低钙水泥体系的力学性能及抗氯离子侵蚀能力的影响。结果表明,C4AF含量为20%的高铁低钙水泥熟料比C4AF含量为18%的高铁低钙水泥熟料的结晶度高;掺LDHs的高铁低钙水泥基材料的3 d和7 d强度有所提高,当掺量为2%时强度达到最大;高铁低钙水泥体系通过提高水泥熟料中的铁相含量、降低硅酸三钙含量、引入具有离子固化能力的LDHs,显著改善了其抗氯离子侵蚀性能,当LDHs掺量为4%时,高铁低钙水泥基材料抗氯离子侵蚀能力最强。In order to improve the performance of resistance to chloride ion erosion of cement-based materials,a high-iron low-calcium(HILC)silicate cement system[C 4AF≥18%,C 3S≤50%,layered double hydroxide materials(LDHs)]are proposed in this paper.The HILC cement clinker with(18%C 4AF,50%C 3S)and(20%C 4AF,48%C 3S)ore phase compositions were prepared respectively.The firing regime and material properties of HILC cement clinker were investigated.The compressive strength of 3,7,28 d and the chloride diffusion coefficient of 28 d of hardened HILC cement paste were tested.The effect of 0%to 8%of LDHs on mechanical properties and resistance to chloride ion erosion of the HILC cement system was studied.The results show that the crystallinity of HILC cement clinker with a C 4AF content of 20%is higher than that of a HILC cement clinker with a C 4AF content of 18%.The increase of LDHs content could increase the compressive strength of HILC cement at 3 d and 7 d.When the LDHs content is 2%,the strength reaches the maximum.By improving the content of iron phase in cement clinker,reducing the content of tricalcium silicate,and introducing LDHs with ion curing ability,the resistance to chloride ion erosion of HILC cement system is significantly improved.When the LDHs content is 4%,the HILC cement-based materials have the strongest resistance to chloride ion erosion.

关 键 词：高铁低钙水泥 LDHs材料 氯离子 早期强度 

分 类 号：TQ177.62[化学工程—硅酸盐工业]