亚微米水泥体积膨胀及水泥浆形变机理

Volume Expansion of Submicron Cement and Deformation Mechanism of Cement Paste

陈福明 曲 源 于浩洋 杨 扬 付高强 郭育芳

CHEN Fuming QU Yuan YU Haoyang YANG Yang FU Gaoqiang GUO Yufang

亚微米水泥固化后体积明显膨胀及析水现象无法用现有理论解释。为探究其机理，分别将G级水泥浆、超细水泥浆和亚微米水泥浆置于高温与外界绝湿环境中养护，它们在水化过程中的形变既有许多相似又有明显不同，但具有规律性。分析总结实验数据并参考前人的研究成果后得出：在不同水化反应阶段，浆体内水化产物微粒先后经历了互相排斥、互相牵引和互相挤压，是水泥浆依次出现初期膨胀、收缩、开裂、膨胀、析水等诸多现象的根本原因。提出的水泥浆形变机理假说可对有关现象做出合理解释。图8表2参20

The volume expansion and separating water of submicron cement after solidification can not be explained by existing theories. In order to explore its mechanism，G-grade，ultra-fine and submicron cement slurry were cured at high temperature of 95℃ under sealed condition. Their deformation during hydration process had many similarities and obvious differences. It was concluded that in different hydration stages，the particles of hydration products in the slurry experienced the mutual exclusion， mutual pulling and mutual extrusion，which was the fundamental reason for the micro expansion，shrinkage，cracking，expansion， separating water and many other phenomena of the slurry in turn. On this basis，referring to the research results of other scholars，acement slurry hydration deformation model was constructed，which could provide a reasonable explanation for some phenomena.

10.19346/j.cnki.1000-4092.2019.02.003