硅铝质尾矿基地聚合物水泥粉料的制备及其砂浆强度性能  

Preparation of Aluminosilicious Tailings-based Geopolymer Cement Powder and Strength Perforamnce of the Cement Mortar

作　　者：焦向科[1,2] 罗仙平[1,2] 李佳[3] 陈骞[4] 严义云 

机构地区：[1]江西理工大学江西省矿业工程重点实验室,赣州341000 [2]江西理工大学工程研究院,赣州341000 [3]中南民族大学资源与环境学院,武汉430074 [4]江西理工大学资源与环境工程学院,赣州341000

出　　处：《硅酸盐通报》2015年第12期3641-3647,3669,共8页Bulletin of the Chinese Ceramic Society

基　　金：国家科技支撑计划项目(2012BAC11B07);中央高校科研专项项目(CZQ15016);江西省教育厅科技项目(GJJ14426);江西省自然科学基金资助项目(20142BAB216008);江西省科技支撑计划项目(20151BBG70015);江西理工大学科研基金重点课题(NSFJ2014-K01);江西理工大学博士科研启动基金项目(3401223152)

摘　　要：以富含Si、Al的尾矿作为硅铝原料(基质),以硅灰和钙质掺和料(矿渣和钢渣)作为辅助材料,在低温煅烧条件下制备地聚合物水泥粉料。以向粉料中"直接加水"形成的砂浆试样的7 d抗压强度作为考察指标,通过正交实验得出最优的原料配方和烧制温度,并通过SEM、XRD、TG-DSC和FTIR对代表性试样的微观结构进行表征。结果表明:"钙质掺合料与尾矿的质量比例"这一因素对砂浆试样的抗压强度影响最大;以矿渣和钢渣为钙质掺合料在最优方案下制备的砂浆试样的7 d抗压强度分别达到12.5 MPa和8.5 MPa,对它们进行蒸压养护可使其抗压强度有所提升;微观结构分析共同验证了由钙质掺合料生成的水化硅酸钙(CSH)未对地聚合物的主体凝胶相产生负面影响,反而有利于改善试样的微结构,提高试样的强度性能。By low-temperature calcination process,geopolymer cement powder was prepared by using tailing rich in Si and Al as aluminosilicate raw materials（ i. e. base materials） and silica fume calcium admixture（ i. e. ground granulated blast furnace slag and steel slag） as supplementary materials. Using the 7 d compressive strength of the mortar samples formed by ＂ just adding water＂ to the powder as the index,the optimum raw materials formula and calcination temperature was obtained by orthogonal experiment. Moreover,microstructure of the representative samples was characterized by means of SEM,XRD,TG-DSC and FTIR analyses. Results indicate that, ＂ mass ratio of calcium admixture to tailing＂ was the factor giving the greatest influence on compressive strength of mortar samples. Under the optimal scheme,7 d compressive strength of the mortar samples prepared from ground granulated blast furnace slag and steelslag respectively can reach 12. 5 MPa and 8. 5 MPa. In combination with microstructure analyses,it was confirmed that existence of calcium silicate hydrate（ CSH） resulting from the calcium admixture would have no negative impact on the main geopolymer gel phase,and instead CSH can improve microstructure morphology and strength performance of samples.

关 键 词：钙质掺和料 地聚合物水泥粉料 正交实验 蒸压养护 

分 类 号：TU525[建筑科学—建筑技术科学]