掺偏高岭土和矿粉蒸养高强砂浆早期水化特征和孔结构研究

发布时间：2018-06-20 12:28

本文选题：偏高岭土 + 蒸汽养护　；参考：《中南大学学报(自然科学版)》2014年08期

【摘要】：针对预应力高强混凝土(PHC)管桩节能生产的需要,研究短期蒸养条件下偏高岭土和矿粉对低水胶比砂浆早期水化性能和孔结构特征的影响。测试掺偏高岭土和矿粉高强砂浆的抗压强度,采用X线衍射(XRD)和热重分析(TGA)研究蒸养水泥石的早期水化物相组成和含量变化,进一步采用MIP法测试蒸养砂浆的孔结构特征。研究结果表明:经短期蒸养后,矿粉对砂浆早期强度、水化性能和孔结构特征影响较小,在空白和单掺矿粉的高强砂浆中存在界面弱区;偏高岭土的掺入则显著提高砂浆1 d抗压强度,加快了砂浆早期水化进程,提高了水化产物中凝胶含量,促进了含铝相水化产物的形成。同时,偏高岭土还细化了砂浆孔径分布,并明显改善了集料与浆体间的结合状态。
[Abstract]:In order to meet the need of energy saving production of prestressed high strength concrete (PHC) pipe pile, the effects of metakaolin and mineral powder on the early hydration performance and pore structure characteristics of low water-binder ratio mortar were studied under the condition of short-term steaming. The compressive strength of high strength mortar mixed with metakaolin and mineral powder was tested. X-ray diffraction (XRD) and thermogravimetric analysis (TGA) were used to study the changes of phase composition and content of hydrates in the early stage of steaming cement paste. Furthermore, the pore structure characteristics of steaming mortar were tested by MIP method. The results show that the influence of mineral powder on the early strength, hydration performance and pore structure of mortar is relatively small after short-term evaporation, and there is a weak interfacial zone in the blank and single mixed high strength mortar. The addition of metakaolin significantly increased the compressive strength of mortar for 1 day, accelerated the early hydration process of mortar, increased the gel content in hydration products, and promoted the formation of hydration products containing aluminum. At the same time, metakaolin also refines the pore size distribution of mortar and obviously improves the binding state between aggregate and mortar.
【作者单位】：武汉理工大学土木工程与建筑学院;中交四航工程研究院有限公司水工构造物耐久性技术交通行业重点实验室;武汉理工大学硅酸盐建筑材料国家重点实验室;
【基金】：广东省科技计划项目(2009A080304009)
【分类号】：TU578.1

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