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砂浆中邻近集料表面最近间距分布的数值模拟

, PP. 100-107

Keywords: 数值模拟,邻近粒子表面最近间距,砂浆,集料,SPACE,系统

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Abstract:

采用具有粒子动态混合密实功能的SPACE系统,实现了高集料体积分数模型砂浆结构的生成。从而,以3种细集料粒径分布的模型砂浆(其中一种的粒径范围为0.125~1.34mm,另外两种的粒径范围为0.25~5.00mm)结构为例,研究了集料细度和集料体积分数(φ=40%~70%)对邻近集料表面最近间距分布的影响。结果表明,集料细度增加和集料体积分数增大都会使大尺度邻近集料表面最近间距出现的概率减小、小尺度邻近集料表面最近间距出现的概率增加,且峰值概率的位置向小间距方向偏移。另外,邻近集料表面最近间距的分区段累计概率结果分析表明,3种模型砂浆结构的邻近集料表面最近间距分布的57%以上小于10μm。最后,邻近集料表面最近间距的平均值的分析结果显示,当集料体积分数在40%~70%之间变化时,邻近集料表面最近间距的平均值在54.6~1.1μm之间变化;当砂浆中集料的体积分数在50%~70%之间变化时,邻近集料表面最近间距的平均值与集料的体积分数基本上呈线性关系;单位砂浆体积下集料的表面积的变化对邻近集料表面最近间距的平均值有影响,但二者之间的比值并非常数。

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