偏高岭石对矿渣基地聚物力学性能的影响机理  

Effect and Mechanism of Metakaolinite on Mechanical Properties of Slag-Based Geopolymer

作　　者：卢俊杰 赵忠宇 刘依 张佰发 卜红玲 Lu Junjie;Zhao Zhongyu;Liu Yi;Zhang Baifa;Bu Hongling(Guangzhou Taihe Concrete Co.,Ltd.,Guangzhou,Guangdong 510540;School of Civil and Transportation Engineering,Guangdong Univer­sity of Technology,Guangzhou,Guangdong 510006;School of Environmental Science and Engineering,Guangdong University of Technology,Guangzhou,Guangdong 510006)

机构地区：[1]广州市泰和混凝土有限公司,广东广州510540 [2]广东工业大学土木与交通工程学院,广东广州510006 [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4期95-99,共5页Non-Metallic Mines

基　　金：广东省基础与应用基础研究基金(2021A1515011540,2023A1515012180)。

摘　　要：利用无钙偏高岭石与高钙矿渣制备地聚物,考察不同配比对所制备地聚物力学性能影响及微观机制。结果表明,地聚反应形成的无定型C(N)(-A)-S-H凝胶和C(-A)-S-H晶体,使得地聚物具有较高的强度。仅使用矿渣的地聚物凝结时间短(13 min),加入偏高岭石能延长地聚物的凝结时间,但基质的密实程度下降,抗压强度会逐渐下降;当矿渣与偏高岭石的质量比为3∶2时,地聚物3 d、7 d和28 d强度分别为34.38 MPa、41.09 MPa和51.57 MPa,强度达到P·O 42.5R水泥要求。In this study,calcium-free metakaolinite and Ca-containing granulated blast furnace slag were used to prepare geopolymer.The result shows that the formation of amorphous C(N)-(A)-S-H gel and C(A)-S-H crystal during geopolymerization endowed the geopolymer with high strength.In addition,the setting time of slag-based geopolymer was very short(13 min),whereas the addition of metakaolinite can extend the setting time of geopolymer,accompanied by the decreased compactness and compressive strength of geopolymer.When the mass ratio of slag to metakaolinite was 3∶2,the 3 d,7 d and 28 d compressive strengths of geopolymer were 34.38 MPa,41.09 MPa and 51.57 MPa,respectively,which can meet the requirements of P·O 42.5R cement.

关 键 词：矿渣 偏高岭石 地聚物 微结构 

分 类 号：TU528.041[建筑科学—建筑技术科学] X75[环境科学与工程—环境工程]