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Effect of freeze-thaw cycle on internal structure and properties of semi-rigid base material

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Document pages: 18 pages

Abstract: In this study, we studied the spatial distribution of the internal structure of semi-rigid base materials (SRBMs), and discussed their influence on the service performance of SRBMs. Spatial void structure analysis was performed using X-ray computed tomography (X-ray CT). Three variables are selected to study the factors affecting the spatial distribution of internal structure, including freeze-thaw cycle, curing time and cement content. The results show that with the increase of freeze-thaw cycles, the average porosity, pore area and pore number of SRBM samples increase, and the average pore diameter of all samples first increases and then decreases. These trends lead to an increase in mass loss rate and strength loss rate. Increasedthe cement content and extending the curing time decreased the average number of voids, average void area, and average void diameter and decreased the mass loss ratio and strength loss ratio of the SRBMs. The top and bottom of the SRBM samples were more porous than the middle of the samples, whereas the maximum value of the average void diameter was observed in the middle of the samples.

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