纳米SiO_(2)增强高流态早强水泥灌浆材料的水化机理  

Hydration mechanism of highly fluidized early strength cement grouting materials enhanced by nano-SiO_(2)

作　　者：庄胜寒 王健[1] 李敏[1] 杨常青 梁晓飞 任皎龙 ZHUANG Shenghan;WANG Jian;LI Min;YANG Changqing;LIANG Xiaofei;REN Jiaolong(School of Architectural Engineering and Spatial Information,Shandong University of Technology,Zibo 255049,China)

机构地区：[1]山东理工大学建筑工程与空间信息学院,山东淄博255049

出　　处：《山东理工大学学报（自然科学版）》2024年第3期51-57,共7页Journal of Shandong University of Technology:Natural Science Edition

基　　金：国家自然科学基金项目(51808326);国家级大学生创新创业训练计划项目(202210433027);山东省大学生科研项目(22SSR087)。

摘　　要：为了满足民用基础设施日益增长的功能要求,水泥灌浆材料必须具有高流态、早强和低收缩的特定性能。本文采用正交试验方法研制了纳米SiO_(2)增强的高流态早强水泥灌浆材料(HECM),通过扫描电子显微镜(SEM)、X射线衍射(XRD)、差示扫描量热(DSC)测试分析了在不同养生龄期和纳米SiO_(2)含量情况下,纳米SiO_(2)对HECM微观结构和水化产物的影响机制。结果表明:HECM在养护1 d时的弯曲强度和抗压强度分别高于3.5 MPa和12 MPa,流动性和收缩率分别小于11s和0.15%;与普通水泥基材料相比,随着HECM中水化速率的加快,纳米SiO_(2)对强度的影响将提前发生。To achieve the ever increasing functional requirements of civil infrastructures,the cement grouting materials must have the specific performances of high-fluidization,early-strength,and low-shrinkage.Hence,a high-fluidization,early-strength cement grouting materials enhanced by nano-SiO_(2) was developed via the orthogonal experimental method in this study.The mechanisms of nano-SiO_(2) on the microstructure and hydration products of the HECM in the cases of different curing ages and nano-SiO_(2) contents were analyzed through the scanning electron microscopy(SEM),X-ray diffraction(XRD)and differential scanning calorimetry(DSC)tests.It is concluded that the bending strength and compressive strength of the HECM during curing for 1 day are higher than 3.5 MPa and 12 MPa,respectively,while the fluidity and shrinkage rate are less than 11s and 0.15%,respectively.Compared with common cement-based materials,it is concluded that the influence of nano-SiO_(2) on the strength will occur in advance with the acceleration of hydration rate in HECM.

关 键 词：水泥灌浆材料 水化机理 纳米SiO_(2) 高流态 早强 

分 类 号：TU528.31[建筑科学—建筑技术科学] TU528.53