核磁共振冷冻测孔法测量水泥基材料孔径分布研究

Study of Pore Size Distribution Measurement of Cementitious Materials by Nuclear Magnetic Resonance Cryoporometry(NMRC)

对核磁共振冷冻测孔法(NMRC法)在水泥基材料中的应用进行了试验探索.通过使用介孔分子筛确定了冰熔点下降值与多孔材料孔径关系,获得熔点下降常数,并以此测定了不同龄期、不同水灰比白水泥样品的孔径分布,对其可能的误差来源作了分析.初步研究结果表明,核磁共振冷冻法测得的白水泥样品孔径分布信息可能比其他方法更为丰富,对封闭微孔的分辨更为其所特有.

The application of nuclear magnetic resonance cryoporometry（NMRC）for cementitious materials was analyzed. The constant in Gibbs-Thomson equation that described the relationship between decrease value of ice melt point and pore size was obtained via measuring some mesoporous molecular sieve with cer- tain pore size. The constant was then used to analyze the white cement samples with different m~/mc at different ages, and the possible error was discussed. The preliminary result shows that NMRC can give more details of pore size distribution of white cement samples than other methods, such as the volume of close micropore.