赤泥-粉煤灰-电石渣复合胶凝材料的力学性能及水化机理  

Mechanical Properties and Hydration Mechanism of Red Mud-Fly Ash-Calcium Carbide Slag Composite Cementitious Materials

作　　者：李钰佳 段思宇 吴浩 史晓凯 韩晓亮 赵佩伦 马志斌 LI Yujia;DUAN Siyu;WU Hao;SHI Xiaokai;HAN Xiaoliang;ZHAO Peilun;MA Zhibin(Institute of Resources and Environmental Engineering,Shanxi University,Taiyuan 030006,China;School of Environment and Resources,Taiyuan University of Science and Technology,Taiyuan 030024,China;Shanxi Dadi Minji Eco-Environment Co.,Ltd.,Taiyuan 030024,China)

机构地区：[1]山西大学资源与环境工程研究所,太原030006 [2]太原科技大学环境与资源学院,太原030024 [3]山西大地民基生态环境股份有限公司,太原030024

出　　处：《硅酸盐通报》2025年第3期1041-1049,共9页Bulletin of the Chinese Ceramic Society

基　　金：山西省科技攻关计划(202202090301021);2023年度襄垣县固废综合利用科技攻关项目(2023-03);忻州市科技计划重点研发项目(20230307)。

摘　　要：以赤泥、粉煤灰和电石渣为主要原料,分别制备了赤泥-粉煤灰、赤泥-电石渣和粉煤灰-电石渣二元体系,赤泥-粉煤灰-电石渣三元体系的复合胶凝试块。以不同养护龄期胶凝试块的抗压强度为主要指标,比较了赤泥、粉煤灰和电石渣的胶凝效应大小,并采用X射线衍射(XRD)、傅里叶变换红外光谱(FT-IR)、扫描电子显微镜及能谱仪(SEM-EDS)和热重分析仪(TGA)对不同胶凝试块的物相组成、分子键结构、微观形貌及热失重特性进行分析,以研究不同胶凝体系的水化机理。结果表明,赤泥-粉煤灰-电石渣表现了更大的协同胶凝效应,当赤泥、粉煤灰和电石渣的掺量分别为35%、30%和35%(质量分数)时,试块28 d抗压强度可达25.4 MPa。相比二元胶凝体系,三元胶凝体系试块水化程度更高,产物更复杂,SEM分析表明三元体系试块呈现水化硅铝酸钠(N-A-S-H)、水化硅铝酸钙(C-A-S-H)凝胶与原料相互联结形成三维网状结构的微观形貌,结构更加致密,力学性能更好。In this paper,using red mud,fly ash and calcium carbide slag as the main raw materials,the composite cementitious test blocks of red mud-fly ash,red mud-calcium carbide slag,fly ash-calcium carbide slag binary systems,and red mud-fly ash-calcium carbide slag ternary system were prepared respectively.The size of gelling effect of red mud,fly ash and calcium carbide slag was compared with the compressive strength of the cementitious test blocks at different curing ages.The phase composition,molecular bond structure,microstructure and thermogravimetric characteristics of the cementitious test blocks were analyzed by XRD,FT-IR,SEM and TGA to study the hydration mechanism of different cementitious systems.The results show that the synergistic gelling effect of the ternary system of red mud,fly ash and calcium carbide slag is the largest.When the content of red mud,fly ash and calcium carbide slag is 35%,30%and 35%(mass fraction)respectively,the 28 d compressive strength of the test block reaches 25.4 MPa.Compared with the binary cementitious system,the ternary cementitious system has higher hydration degree and more complex products.SEM analysis shows that the ternary cementitious system test block of sodium aluminate hydrate(N-A-S-H)and calcium aluminate hydrate(C-A-S-H)are interlinked with the raw materials to form a three-dimensional network structure,which makes the structure more dense and has better mechanical properties.

关 键 词：胶凝材料 赤泥 水化硅铝酸钠 水化硅铝酸钙 水化机理 抗压强度 

分 类 号：TU526[建筑科学—建筑技术科学]