Abstract
The section-analysis method was used to determine the air-void parameters of hardened cement pastes. The results are compared to those obtained using the point-count method. Five series of air-entrained cement pastes with different water-to-cement ratios were prepared. The point-count method was conducted using a stereoscopic microscope at 50× and the section-analysis method was applied by taking photographs at 80× and reproducing the surface under study. The air content, specific surface, and spacing factor were determined using the point-count method. The air content and the air-void size distributions were obtained using the section-analysis method. For the size of surface area examined and for the air content tested in this study, the results show that the air contents determined using the section-analysis method are lower than the air contents determined using the point-count method by 1.4% to 34.3%. The air-void size distributions obtained using different calculation procedures compare well to each other for all series.
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