薄层水泥净浆早期水化过程分层电学测量  

Layered electrical measurement of early hydration process of thin cement paste

作　　者：汪博浩 王卫 金峰[1] 谭捍东[3] 黄杜若 WANG Bohao;WANG Wei;JIN Feng;TAN Handong;HUANG Duruo(State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084;Institute of Science and Technology,China Three Gorges Corporation,Beijing 100038;School of Geophysics and Information Technology,China University of Geosciences,Beijing 100083)

机构地区：[1]清华大学水沙科学与水利水电工程国家重点实验室,北京100084 [2]中国长江三峡集团科学技术研究院,北京100038 [3]中国地质大学(北京)地球物理与信息技术学院,北京100083

出　　处：《水力发电学报》2020年第8期28-35,共8页Journal of Hydroelectric Engineering

基　　金：国家自然科学基金国际(地区)合作与交流项目NSFC-RGC组织间合作研究(51861165102);水沙科学与水利水电工程国家重点实验室科研项目(2019-KY-02)

摘　　要：自流控制灌浆形成的胶结颗粒料内部环境条件不同于普通混凝土。为研究环境条件对其水化反应进程的影响,本文采用埋入式电极阵列等设备,对薄层水泥净浆的早期水化过程进行较为精细的分层电学测量,并使用热重分析手段对电学测量结果进行印证。结果表明,在水化反应初始水解期和休眠期,试样水化进程在垂直方向上基本均匀,且不同厚度试样水化进程基本一致;水化反应加速期以后,接近表面处的孔隙饱和度小于内部较深处的孔隙饱和度,导致一定龄期后接近表面处的水化程度小于内部较深处的水化程度、较薄试样接近表面处的水化程度小于较厚试样同样深度处的水化程度。这些结论可为胶结颗粒料施工的质量控制提供参考。The internal environment of cemented granular materials formed by gravity control grouting is different from that of ordinary concrete. To investigate the influence of internal environment on hydration reaction, this study conducts subtle layered electrical measurements of the early hydration stage of thin cement paste using an embedded electrode array and other equipment, and uses thermogravimetric analysis to verify the measurements. Results show that in the initial hydrolysis stage and dormant stage of the reaction, the hydration process of test samples is basically uniform along vertical direction and the hydration process of samples of different thickness is also basically the same. Starting from the accelerating stage, pore saturation in the shallow layer of a sample becomes smaller than that in the deep layer. Therefore, after a certain curing age, the degree of hydration in the shallow layer is lower than that in the deep layer;and its value in the shallow layer of a thinner sample is smaller than that at the same depth in a thicker sample. This study would help quality control in the construction of cemented granular materials.

关 键 词：水泥净浆 埋入式电极阵列 水化过程测量 孔隙饱和度 热重分析 

分 类 号：TV41[水利工程—水工结构工程]