Hydration Characteristics and Mechanical Properties of Cement-Based Materials Modified by Calcined Zeolite and Montmorillonite  

作　　者：Lingling Qin Mengya Zhou Jiahao Yan Ping Duan Yingcan Zhu Wei Chen Zuhua Zhang Aiguo Wang 

机构地区：[1]Faculty of Materials Science and Chemistry,Key Laboratory of Geological Survey and Evaluation of Ministry of Education,China University of Geosciences,Wuhan,430074,China [2]Key Laboratory of Advanced Building Materials of Anhui Province,Anhui Jianzhu University,Hefei,230022,China [3]Guangxi Key Laboratory of New Energy and Building Energy Saving,Guilin University of Technology,Guilin,541004,China [4]Key Laboratory of Road Structure and Materials of Ministry of Transport,Chang’an University,Xi’an,710064,China [5]Centre for Sustainable Agricultural Systems,University of Southern Queensland,Toowoomba,QLD,4350,Australia [6]State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan,430070,China [7]Key Laboratory for Green&Advanced Civil EngineeringMaterials and Application Technology of Hunan Province,College of Civil Engineering,Hunan University,Changsha,410082,China

出　　处：《Journal of Renewable Materials》2023年第5期2191-2207,共17页可再生材料杂志（英文）

基　　金：The research presented in this paper was supported by National Natural Science Foundation of China(Grant No.52272031);the Fundamental Research Funds for the Central Universities,China University of Geosciences(Wuhan),and the Opening Fund of Guangxi Key Laboratory of New Energy and Building Energy Saving(Grant No.19-J-22-2);Key Research and Development Program of Hubei Province(Grant No.2020BAB065);Key Research and Development Program of Jiangxi Province(Grant No.20201BBG71011);Fundamental Research Funds for the Central Universities,CHD(Grant No.300102211506);Opening Fund of Key Laboratory of Advanced Building Materials of Anhui Province(Grant No.JZCL001KF).

摘　　要：Montmorillonite and clinoptilolite zeolite were used as representative materials to prepare calcined clay-cement binary cementitious materials in order to study the effect of calcination treatment on the activation of clay minerals and the activity difference between layered and framed clays in this research.The influence of different calcined clay content(2%,4%,6%,8%,10%)on the fluidity,compressive strength,microstructure,phase change,and hydration heat of cement-based materials were analyzed.The calcined clay improves the fluidity of cement-based materials as compared with the uncalcined group.The addition of calcined montmorillonite(CMT)improves the development of mechanical strength,and the optimal compressive strength reaches 85 MPa at 28 days with 8%CMT.However,the activity of calcined clinoptilolite zeolite(CZL)is weak with few reaction sites,which slightly reduced the mechanical strength as compared to the blank sample.The addition of CMT changes the microscopic morphology of hydration products such as C-S-H and C-A-H,leading to the formation and transformation of ettringite in the early stage.It promotes the gradual polymerization of Si-O bonds into Si-O-Si bonds simultaneously,which accelerates the early hydration process.However,CZL acts mainly as a filling function in the cementitious system.In brief,CMT as an admixture can improve the mechanical properties of cement,but CZL has little effect.This work provides a guideline for the applications of calcined clay in cement,considering the influence of clay type on workability and mechanical strength.

关 键 词：Calcined clay cement MONTMORILLONITE clinoptilolite zeolite mechanical strength HYDRATION 

分 类 号：TQ172.1[化学工程—水泥工业]