矿渣基地聚合物材料的制备、特性及机理研究  

Preparation,Properties and Mechanism of Slag based Geopolymer

作　　者：贾艳涛[1,2] 张云升[3] 张文华[3] 

机构地区：[1]河海大学海岸灾害及防护教育部重点实验室,南京210098 [2]河海大学材料学院,南京210098 [3]东南大学江苏省土木工程材料重点实验室,南京211189

出　　处：《武汉理工大学学报》2009年第7期120-125,共6页Journal of Wuhan University of Technology

基　　金：河海大学海岸灾害及防护教育部重点实验室开放研究基金;国家自然科学基金(50702014;50878043);教育部新世纪优秀人才计划;东南大学优秀青年教师教学科研资助计划

摘　　要：利用矿渣粉取代部分偏高岭土来配制地聚合物基体,以强度为指标寻求最佳地聚合物配比;同时为优化养护制度,采用了标准养护、蒸汽养护、压蒸养护3种养护制度,从中选出最有利于发挥胶凝材料活性的养护制度;实验结果表明,在矿渣粉掺量为50%,80℃蒸养8 h时抗压和抗折强度达到最优,分别为75.2 MPa、10.1 MPa。之后,将粗集料加入到这种最优的矿渣-地聚合物基体中制成混凝土,并对混凝土的抗氯离子渗透、抗冻融性能进行了研究,发现其具有非常优异的耐久性。另外,利用红外、X衍射、扫描电镜和化学分析对地聚合物的形成机理及结构本质进行了研究,发现矿渣基地聚合物在合成过程中SiO4对应的1 086 cm-1红外振动峰向低波数偏移,6配位Al也转化为4配位,最终产物是由典型的地聚合物和低钙的C-S-H 2种凝胶体,这2种不同类型的产物同时形成使得矿渣基地聚合物变得致密均匀,力学性能提高。In this paper, slag was investigated as a basic Si-Al ingredient of geopolymer. Based on compressive and flexural strength, the amount of slag and 3 types of curing regimes were studied toobtain the optimum condition. The results showed that geopolymer containing 50 % slag that was prepared at 80% for a period of 8 h, exhibited high strength. The compressive and flexural strength of the fly ash based geopolymer were 75.2 and 10.1 MPa, respectively. Study on these behaviors of Cl^- permeability, freezing and thrawing showed that the slag-geopolymer concrete had very excellent durability. Additionally, Infrared spectrum, X-ray diffraction, SEM and Chemical Analysis showed that the reaction products of slag-geopolymer paste is composed of two separate amorphous phases （geopolymeric gel and C-S-H gel）. The simultaneous formation of the gels helps to bridge the gaps between the different hydrated phases and unreacted particles, resulting in a dense and homogeneous matrix and high strength. IR peak at 1 086 cm^-1 caused by the stretching vibration of SiO4 tetrahedra shifted to lower wavenumbers around 1 007 cm^-1.

关 键 词：地聚合物 矿渣粉 制备 特性 机理 

分 类 号：TU528[建筑科学—建筑技术科学]