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The results indicated that air content and strength of the concrete had significant effects on the freezing and thawing durability of concrete with and without PFA.
结果表明，混凝土的引气量和强度是影响普通混凝土和粉煤灰混凝土抗冻性的决定因素，满足抗冻性要求的引气量取决于相应的混凝土强度等级。
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