水泥水化过程的概率模型及其微结构演变的数值模拟  

Probabilistic Model of Cement Hydration and Numerical Simulation on Its Microstructure Evolution

作　　者：易家俊 左晓宝[1] 黎亮[1] 邹欲晓 YI Jiajun;ZUO Xiaobao;LI Liang;ZOU Yuxiao(School of Science,Nanjing University of Science&Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学理学院,南京210094

出　　处：《材料导报》2023年第18期145-151,共7页Materials Reports

基　　金：国家自然科学基金(52078252,51778297)。

摘　　要：为了实现水泥水化过程及微结构演变规律的数值模拟,根据水泥组成矿物相的水化反应机理,利用随机概率方法,建立了水泥水化反应及微结构演变过程的概率模型,该模型通过水泥净浆初始组成结构中各矿物相颗粒像素的随机移动与碰撞反应,模拟水泥水化及微结构的演变过程。以水灰比分别为0.23、0.35、0.53的水泥净浆为例,利用该模型数值模拟了水泥净浆的水化过程及微结构演变规律,结果表明,水灰比可显著影响水泥水化过程,在同一水化龄期,水灰比越大,水泥水化越充分,其微结构的孔隙率以及孔隙连通度越高;当水泥浆体微结构的毛细孔隙完全断开时,其临界总孔隙率约为20%。In order to numerically investigate the hydration process and microstructure evolution of cement,a probabilistic model was established by using the hydration mechanism of cement and the random probability method.Based on this model,the hydration of cement and its microstructure evolution was simulated by means of random movement and collision reaction of particle pixel of each mineral phase.Then,the specimen of cement paste with water-cement ratios of 0.23,0.35,and 0.53 were taken as research objects,and their hydration process and microstructure evolution were numerically simulated.Results show that,the water-cement ratio can significantly affect the hydration process of cement.At the same hydration time,the hydration degree of cement,porosity and pore connectivity have an obvious increase with the water-cement ratio.When the capillary pores in the microstructure of hardened cement paste are completely disconnected,the corresponding critical total porosity is about 20%.

关 键 词：水泥水化 模型 微结构演变 数值模拟 

分 类 号：TU528[建筑科学—建筑技术科学]