论文部分内容阅读
针对硫酸盐侵蚀过程中水泥净浆体积膨胀问题,运用微孔力学理论,建立了水泥净浆基体与其孔隙内钙矾石晶体相互作用的代表性体积单元(RVE)及其力学分析模型;分析了一定钙矾石生成量下的RVE内膨胀应变在微观尺度上的空间分布规律;通过均匀化方法,将微观尺度上的RVE内膨胀应变转化为宏观尺度上RVE所在位置点的等效应变,分析了该等效应变随钙矾石生成量的变化规律。分析结果表明:微观尺度上,孔隙率为0.1的RVE内钙矾石晶体和侵蚀溶液组成的内球体各向为拉应变,水泥净浆外球壳径向为压应变、环向为拉应变;宏观尺度上,孔隙率为0.1的RVE所在位置点的径向等效应变为压应变,且随钙矾石生成量的增加而增大,而环向等效应变为拉应变,且随钙矾石的生成量的增加而增大。
Aiming at the problem of volume expansion of cement paste in the process of sulfate attack, a representative volume element (RVE) and its mechanical analysis model of the interaction between cement paste matrix and ettringite in its pores were established by using the theory of micropore mechanics. A certain amount of ettringite formation in the RVE within the expansion of the spatial distribution of strain at the microscopic scale; by homogenization method, the micro-scale RVE within the expansion strain into macro-scale RVE where the equivalent strain point analysis The equivalent strain changes with the formation of ettringite. The analysis results show that microspheres, the inner sphere composed of the ettringite and erosion solution in RVE with a porosity of 0.1 has a tensile strain in all directions and the radial outer shell has a compressive strain in the radial direction and a tensile strain in the circumferential direction. Macroscopically, the radial equivalent strain at the point of RVE with porosity of 0.1 is compressive strain, and increases with the increase of the amount of ettringite, while the ring equivalent strain is tensile strain, and with the increase of ettringite The amount of stone produced increases.