偏高岭土-矿渣基地聚物与花岗岩骨料界面的分布特性及影响因素

发布时间：2018-02-04 04:13

本文关键词： 地聚物界面过渡区偏高岭土矿渣花岗岩骨料　出处：《复合材料学报》2017年11期 　论文类型：期刊论文

【摘要】：以碱激发偏高岭土-矿渣作为胶凝材料、花岗岩为骨料制备地聚物混凝土,通过扫描电镜SEM-EDS及显微硬度分析研究地聚物与骨料的界面粘结区的微观结构、分布,以及液固比和骨料尺寸对地聚物-骨料界面的影响。研究结果表明,在地聚物与骨料的界面区域存在界面过渡区(ITZ),包含了以N-A-S-H凝胶为主的固相和收缩裂缝,化学组分与地聚物凝胶有较大不同。界面过渡区沿骨料周围不同位置表现出明显的分布不均匀特性,骨料下缘处的界面过渡区的微观结构和硬度都显著更差。随着液固比及骨料半径的增大,其分布的不均匀性增加:骨料下界面ITZ中的裂缝宽度增大,N-A-S-H凝胶厚度减小且强度降低;但配比及骨料尺寸对骨料上界面及侧界面的ITZ影响并不显著。骨料下界面ITZ应是偏高岭土-矿渣基地聚物混凝土的薄弱区域。
[Abstract]:The aggregate concrete was prepared with alkali excited metakaolin-slag as cementitious material and granite as aggregate. The microstructure and distribution of interfacial bonding zone between aggregates and geopolymers were studied by scanning electron microscope (SEM) SEM-EDS and microhardness analysis. The effect of liquid-solid ratio and aggregate size on the interface between aggregates and geopolymer is also studied. The results show that there is an interfacial transition zone (ITZ) in the interface between aggregates and aggregates. The N-A-S-H gel is mainly composed of solid phase and shrinkage crack. The chemical composition is different from that of geopolymer gel, and the interfacial transition zone shows obvious uneven distribution along different positions around aggregate. The microstructure and hardness of the interfacial transition zone at the lower edge of aggregate are significantly worse. With the increase of liquid-solid ratio and aggregate radius, the inhomogeneity of the distribution increases; the crack width in the interface ITZ under aggregate increases. The thickness and strength of N-A-S-H gel decreased. However, the ratio of aggregate and the size of aggregate have no significant effect on the ITZ of the upper and lateral interface of aggregate. The ITZ under aggregate interface should be the weak area of metakaolin-slag base aggregate concrete.
【作者单位】：长沙理工大学交通基础设施安全风险管理行业重点实验室;长沙理工大学桥梁工程安全控制教育部重点实验室;路易斯安那州立大学土木与环境工程系;
【基金】：国家自然科学基金(51578078) 国家“973”计划(2015CB057701) 长沙市科技计划(K1508020-31) 长沙理工大学土木工程优势特色重点学科创新性项目(16ZDXK10);长沙理工大学交通基础设施安全风险管理行业重点实验室开放基金(16BCX06) 湖南省研究生科研创新项目(CX2016B388)
【分类号】：TU528
【正文快照】： 网络出版地址:http://kns.cnki.net/kcms/detail/11.1801.TB.20170327.0709.002.html引用格式:崔潮,肖斌,张建仁,等.偏高岭土-矿渣基地聚物与花岗岩骨料界面的分布特性及影响因素[J].复合材料学报,2017,34(11):2605-2613.CUI Chao,XIAO Bin,ZHANG Jianren,et al.Distribution

【相似文献】