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Face slab concrete suffers from serious frost damage in the cold regions in China. How to improve the frost resistance of face slab concrete in cold regions is one of the important issues in concrete-faced rockfill dam (CFRD) design and construction. The results in this paper indicate that the frost resistance of concrete can be improved by adding fly ash, fiber, MgO and shrinkage-reducing admixtures (SRAs), and their efficiencies are in the following sequence: (fly ash Formula: see text fiber) Formula: see text fiber Formula: see text fly ash Formula: see text MgO Formula: see text SRA. The incorporation of 0.8Formula: see textkg/m 3 polyvinyl alcohol (PVA) fiber and 20Formula: see textwt.% fly ash together enhances the compressive strength and tensile capacity of concrete by 6–7% at the late age, whereas the addition of 6Formula: see textwt.% MgO or 1Formula: see textwt.% SRA reduces the compressive strength and tensile capacity by about 4–10% at various ages. The Formula: see text of concrete added with fly ash, fiber, MgO and SRA is within the range of 2.619–2.796. The frost resistance of concrete correlates linearly with the air void parameters, pore structures and Formula: see text. The utilization of fly ash and/or PVA fiber refines and optimizes the pore structure, thus increasing Formula: see text and improving the frost resistance. On the contrary, MgO and SRA in this study are less effective in refining the pores than PVA fiber and fly ash, thereby producing smaller Formula: see text and relatively weaker frost resistance.
Wang et al. (Tue,) studied this question.