矿渣掺量及激发剂模数对偏高岭土基地聚物常温固化的影响

发布时间：2018-05-19 10:42

本文选题：偏高岭土 + 矿渣　；参考：《建筑材料学报》2017年04期

【摘要】：将粒化高炉矿渣(GGBFS)掺入偏高岭土(MK)中,研究了矿渣掺量对具有常温固化能力胶凝材料稠度、凝结时间及力学性能的影响,并通过X射线衍射(XRD),傅里叶变换红外光谱(FTIR),扫描电镜(SEM)等分析手段研究了偏高岭土-矿渣复合体系的反应机理.结果表明:将矿渣掺入偏高岭土能减小浆体的稠度,缩短其凝结时间;偏高岭土-矿渣复合体系可在常温下固化,得到具有较高强度的硬化浆体;在碱激发作用下偏高岭土-矿渣复合体系发生了地质聚合反应和矿渣水化反应,生成了N-A-S-H凝胶与C-S-H凝胶共存的结构;激发剂模数和偏高岭土与矿渣的质量比是影响反应产物强度的主要因素——矿渣掺量不高于40%(质量分数)时,反应产物的强度随激发剂模数增大而降低;矿渣掺量超过60%后,反应产物强度随激发剂模数增大而提高.
[Abstract]:Granulated blast furnace slag (GGBFS) was mixed into metakaolin (MK). The effects of slag content on the consistency, setting time and mechanical properties of cementing materials with curing capacity at room temperature were studied. The reaction mechanism of metakaolin / slag composite system was studied by means of X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The results show that the consistency and setting time of the slurry can be reduced by adding the slag into the metakaolin, and the hardened slurry with high strength can be obtained by solidifying the compound system of metakaolin and slag at room temperature. The structure of N-A-S-H gel and C-S-H gel was formed by geological polymerization and slag hydration under alkali excitation. The modulus of activator and the mass ratio of metakaolin to slag are the main factors affecting the strength of the reaction product. When the content of slag is not higher than 40 (mass fraction), the strength of the reaction product decreases with the increase of the modulus of activator, and when the content of slag exceeds 60%, the strength of the reaction product decreases with the increase of the modulus of activator. The strength of the reaction product increases with the increase of the activator modulus.
【作者单位】：长沙理工大学土木与建筑学院;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】：国家自然科学基金资助项目(51578078) 国家重点基础研究发展计划(973计划)项目(2015CB057701) 湖南省杰出青年基金(2017JJ1027) 长沙市科技计划项目(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)
【分类号】：TU528

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