粉煤灰-偏高岭土基地质聚合物混凝土的性能研究  

Study on Performance of Fly Ash-Metakaolin Base Geopolymer Concrete

作　　者：李文涛 王彩萍[1] 曹红红[1,2] 渠永平 焦纬洲 孙学良[4] 李亚敏 LI Wentao;WANG Caiping;CAO Honghong;QU Yongping;JIAO Weizhou;SUN Xueliang;LI Yamin(School of Materials Science and Engineering,North University of China,Taiyuan 030051,China;Shanxi Provincial Technology Innovation Center of Collaborative Disposal and Low-Carbon Utilization of Industrial Solid Waste,Jincheng 048000,China;School of Chemistry and Chemical Engineering,North University of China,Taiyuan 030051,China;CAUPD Beijing Planning&Design Consultants Ltd.,Beijing 100044,China;Changzhi Drainage Affairs Center,Changzhi 046000,China)

机构地区：[1]中北大学材料科学与工程学院,山西太原030051 [2]工业固废协同处置与低碳化利用山西省技术创新中心,山西晋城048000 [3]中北大学化学与化工学院,山西太原030051 [4]中规院(北京)规划设计有限公司,北京100044 [5]长治市排水事务中心,山西长治046000

出　　处：《中北大学学报(自然科学版)》2025年第1期124-132,共9页Journal of North University of China(Natural Science Edition)

基　　金：山西省重点研发计划项目(202102090301024);山西省重点研发计划项目(202102090301025);山西省重点研发计划项目(2022ZDYF024);长治市海绵示范城市建设相关技术研究;山西省基础研究计划项目(20210302123049);山东省自然科学基金青年项目(ZR2022QE108)。

摘　　要：为了解决粉煤灰基地质聚合物混凝土早期强度较弱,后期强度增长缓慢的问题,本文以偏高岭土与粉煤灰为主要原料设计制备了固废基地质聚合物混凝土,并通过正交试验,研究了水玻璃模数、碱含量、粉煤灰与偏高岭土的比例、减水剂掺量等4个因素对地质聚合物混凝土工作性能与力学性能的影响,并对其机理进行了分析。结果表明:最优配比为硅酸钠占比为45%,粉煤灰与偏高岭土的比为1∶1,水胶比为0.55,砂率为0.5、,水玻璃模数为1.4,萘系减水剂掺量为1.2%。该配比下的混凝土相较于粉煤灰基地质聚合物混凝土早期强度高,后期强度增长率大,28 d强度增长率达106%。偏高岭土地质聚合物混凝土的抗压强度的增长,是因为偏高岭土中的石英和莫来石与水玻璃溶液发生地聚反应,生成了无定型网状结构的钠沸石(Na_(2)[Al_(2)Si_(3)O_(10)]·_(2)H_(2)O)。In order to solve the problem of weak early strength and slow growth in later strength of fly ash based geopolymer concrete,this paper designed and prepared solid waste based geopolymer concrete using metakaolin and fly ash as the main raw materials.Through orthogonal experiments,the effects of four factors,including water glass modulus,alkali content,ratio of fly ash to metakaolin,and water reducer dosage,on the performance and mechanical properties of geopolymer concrete were studied,and its mechanism was analyzed.The results show that the optimal ratio is sodium silicate percentage of 45%,fly ash to metakaolin of 1∶1,water cement ratio of 0.55,sand ratio of 0.5,water glass modulus of 1.4,and naphthalene based water reducer dosage of 1.2%.The concrete under this ratio has higher early strength and a larger growth rate in later strength compared with fly ash based geopolymer concrete,with a strength growth rate of 106%after 28 days.The increase in compressive strength of metakaolin geopolymer concrete is attributed to the geopolymerization reaction of quartz and mullite of metakaolin with water glass solution,resulting in the formation of amorphous network structured sodium zeolite(Na_(2)[Al_(2)Si_(3)O_(10)]·_(2)H_(2)O).

关 键 词：粉煤灰 偏高岭土 地质聚合物混凝土 力学性能 

分 类 号：U416.216[交通运输工程—道路与铁道工程]