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纳米压痕技术研究磨细矿渣对水泥基材料微观力学性能的影响

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Abstract:

应用纳米压痕技术对水泥净浆以及掺磨细矿渣的水泥浆体中各个区域的弹性模量、硬度等微观力学性能进行了测试和计算,同时,利用Gaussian函数对弹性模量、硬度的频率分布曲线进行了多峰拟合,获得水化产物中毛细孔、高密度C-S-H凝胶、低密度C-S-H凝胶以及氢氧化钙相关参数的统计分布。结果表明水泥净浆中高密度C-S-H凝胶硬度及弹性模量随着水化龄期的延长而提高,体积含量增大;磨细矿渣的掺入能使水化后期浆体中C-S-H的硬度和弹性模量出现一定幅度的增大;当磨细矿渣掺量达到50%时,频率分布拟合曲线中没有氢氧化钙峰出现,说明大量磨细矿渣的二次水化消耗了浆体中大部分氢氧化钙。

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