截面分析法对界面过渡区厚度的放大作用

OVERESTIMATION OF THICKNESS OF INTERFACE TRANSITION ZONE OF AGGREGATE IN CONCRETE BY SECTIONAL ANALYSIS METHOD

在采用截面法分析研究截面过渡区厚度时,由于截平面并不一定正好垂直于集料的表面,导致得到的表观界面过渡区厚度与实际界面过渡区厚度是不同的。以3种规则形状(球形、椭圆形截面以及矩形截面)的集料为例,从几何概率角度研究了截面分析法对界面过渡区厚度的放大问题。研究结果表明,截面分析法得到的表观界面过渡区厚度都大于实际的界面过渡区厚度,平均放大倍数与集料的粒形有关。对正方体性集料而言,平均表观界面过渡区的厚度是实际界面厚度的1.12倍;对球形集料而言,实际界面过渡区厚度被放大了π/2倍。

The thickness of interface transition zone (ITZ) of aggregates in concrete was investigated by a sectional analysis method. The apparent thickness of the ITZ is different from actual one due to the non-perpendicular of the section plane to the surface of irregular aggregate particles in the sectional analysis, and three kinds of aggregate with regular shape (spheroid section, elliptical section and rectangular section) were discussed. The relationship between the apparent thickness of ITZ and its actual thickness was also analyzed by a geometrical statistical approach. The results show that the apparent thickness of the ITZ is larger than the actual thickness of the ITZ, and the amplification factor is related to the shape of the aggregate. For square and spherical particles, the ratio of the apparent thickness of ITZ to its actual one is 1.12.