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EXPERIMENTAL STUDY AND QUANTITATIVE CHARACTERIZATION OF EFFECTIVE POROSITY IN CEMENT-BASED COMPOSITE MATERIALS
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摘要: 为了研究水泥基复合材料传输与孔结构的定量关系，采用二次进汞的方法，系统研究了水灰比为0.23，0.35，0.53的硬化浆体在28 d的孔结构参数。研究表明:二次进汞的方法能很好表征有效孔结构参数，其中有效孔隙率是总孔隙率的25%～50%;由孔径分布曲线可知，水灰比为0.53时出现双峰，第一个峰值对应的是毛细孔的临界孔径，第二个峰值对应于凝胶孔的临界孔径，随水灰比的降低，第一峰值逐渐消失;0.23，0.35，0.53浆体对应的第一峰值分别是0.053，0.062，0.077m。Abstract: The method of the second intrusion mercury in MIP is used to investigate the pore characteristics of hardened cement paste with water to cement ratio(w /c) 0.23,0.35 and 0.53 respectively,in order to research the quantitative relationship between transport properties and pore characteristics in cement-based composite materials.The results show the second intrusion mercury could well determine the effective pore characteristics,and effective porosity accounts for 25% to 50% of total porosity in cement paste.At the same time,The existence of the first and second peak in the MIP pore size distribution curves is confirmed,such as,the first peak in hardened cement paste with water to cement ratio 0.53 is very distinct,however,with the decrease of water to cement ratio,the first peak gradually disappears.The pore diameter corresponding to the first and second peak is critical pore diameter of capillary pore and gel pore,respectively.The first peak value of hardened cement paste with w /c 0.23,0.35 and 0.53,respectively,is 0.053,0.062 and 0.077 m.
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