利用黏土质渣土制备酸激发地聚物的研究  

Investigation on Preparing Acid Activated Geopolymer from Clay-Rich Engineering Muck

作　　者：陈佳蓉 玉婷 张佰发 袁鹏 Chen Jiarong;Yu Ting;Zhang Baifa;Yuan Peng(Guangzhou Institute of Geochemistry,Chinese Academy of Sciences,Guangzhou,Guangdong 510640;University of the Chinese Academy of Sciences,Beijing 100049;School of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou,Guangdong 510006)

机构地区：[1]中国科学院广州地球化学研究所,广东广州510640 [2]中国科学院大学,北京100049 [3]广东工业大学环境科学与工程学院,广东广州510006

出　　处：《非金属矿》2023年第5期18-21,34,共5页Non-Metallic Mines

基　　金：国家自然科学基金(41972045);广东省基础与应用基础研究基金(2023A1515012180)。

摘　　要：由于城市化的推进,我国南方地区产生大量富含黏土矿物的工程渣土,亟待高效利用。本研究通过酸激发反应制备渣土基地聚物,考察了煅烧温度对酸激发渣土基地聚物力学性能的影响及机理。结果表明,渣土活化的最佳温度为700℃,制备的酸激发地聚物7 d抗压强度可由未煅烧时的2.02 MPa提升至29.04 MPa。矿物成分及微观结构分析表明,煅烧使渣土中高岭石转变为偏高岭石,提升了地聚反应活性,使渣土能够更好地与磷酸反应形成结构更密实的基质,进而提高地聚物的抗压强度。Due to the advancement of urbanization,a large amount of engineering muck(EM)rich in clay minerals is generated in southern China,which urgently needs to be efficiently utilized.In this study,acid activated EM based geopolymers were prepared,and the effect of calcination temperature on the mechanical properties of acid activated EM based geopolymers was investigated.The results show that the optimal temperature for activation of the EM is 700℃,and the 7 d compressive strength of the corresponding geopolymer is 29.04 MPa,while that of the geopolymer prepared from EM without calcination is only 2.02 MPa.The analysis of mineral composition and microstructure shows that calcination can transform kaolinite in the EM into metakaolinite with higher geopolymerization activity,which can better react with phosphoric acid to form a denser geopolymer matrix,thus improving the compressive strength of products.

关 键 词：工程渣土 偏高岭石 地聚物 酸激发 

分 类 号：TU528.041[建筑科学—建筑技术科学]