室温碱激发粉煤灰基胶凝材料制备及其性能研究  

Preparation and mechanical properties of fly ash based cementitious materials activated by alkali at room temperature

作　　者：赵银飞 邓凯 邬争光 吕伟冬 宋帅 杨晶[3,4] 牛玺荣 ZHAO Yinfei;DENG Kai;WU Zhengguang;LYU Weidong;SONG Shuai;YANG Jing;NIU Xirong(Shanxi Construction Investment Group Co.LTD.,Taiyuan 030032,China;College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China;School of Electric Power and Civil Engineering,Shanxi University,Taiyuan 030031,China;Shanxi Province Smart Building and Green Construction Technology Pilot Base,Taiyuan 030031,China)

机构地区：[1]山西建设投资集团有限公司,山西太原030032 [2]太原理工大学土木工程学院,山西太原030024 [3]山西大学电力与建筑学院,山西太原030031 [4]山西省智慧建筑与绿色建造技术中试基地,山西太原030031

出　　处：《新型建筑材料》2024年第7期60-64,共5页New Building Materials

基　　金：国家级大学生创新创业训练项目(202210108021);山西省大学生创新创业训练项目(S202210108053);山西建设投资集团有限公司科技项目(DQ-JS-01,DQ-JT002);山西交通控股集团有限公司科技创新项目(2021-JKKJ-8)。

摘　　要：以不同细度粉煤灰为原料,加入适量矿渣和水泥熟料,并以钠水玻璃为碱激发剂,在常温下制备出了碱激发粉煤灰基胶凝材料。采用正交试验的方法,分析了原状粉煤灰与磨细粉煤灰质量比、碱激发剂中NaOH含量、矿渣用量和碱激发剂掺量对碱激发粉煤灰基胶凝材料抗压强度的影响,结合XRD和SEM对试样进行表征。结果表明:当原状粉煤灰和磨细粉煤灰质量比为1∶3、碱激发剂中NaOH含量为15%、矿渣用量为固废的20%、碱激发剂掺量为液体总量的13%时,胶凝材料3、28、60d抗压强度分别为19.6、29.0、35.5MPa。粉煤灰与矿渣中的Al—O键和Si—O键断裂,发生重组生成硅铝酸盐C-A-S-H凝胶和C-S-H凝胶。This article uses raw/fine fly ash as raw material,and by adding an appropriate amount of slag and cement clinker,sodium silicate is used as an alkaline activator to prepare alkali activated fly ash based cementitious material at room temperature.The influence of ratio of raw fly ash to fine fly ash,NaOH content in alkali activator,as well as slag and alkali activator content on the compressive strength of alkali activated fly ash based cementitious material was analyzed by using orthogonal experimental methods,combined with XRD and SEM experiments to characterize the samples.The results showed that,when the ratio of raw fly ash to fine fly ash was 1∶3,NaOH accounted for 15%of the alkali activator,the slag content was 20%of the solid waste,and the alkali activator content was 13%of the total liquid content,the compressive strength at the age of 3 d,28 d,60 d could reach 19.6 MPa,29.0 MPa,and 35.5 MPa,respectively.The Al—O bond and Si—O bond in the fly ash and slag were broken,and the aluminosilicate C-A-S-H gel and C-S-H gel were recombined.

关 键 词：粉煤灰 矿渣 碱激发 胶凝材料 正交试验 力学性能 

分 类 号：TU526[建筑科学—建筑技术科学]