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工程力学  2015 

硫酸盐侵蚀下水泥净浆膨胀应变计算

DOI: 10.6052/j.issn.1000-4750.2014.02.0108, PP. 119-125

Keywords: 硫酸盐侵蚀,力学分析模型,水泥净浆,代表性体积单元,膨胀应变,钙矾石

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Abstract:

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。

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