【单选题】【消耗次数：1】
不属于影响混凝土结构耐久性的因素是（ ）。
①
冻融
②
氯离子的侵入
③
混凝土的碳化
④
水化反应
参考答案：
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关于混凝土的耐久性设计的要求，下面那种说法是不恰当的（ ）？
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民用建筑游泳池内的框架柱，当设计年限为50年时，当采用混凝土强度等级不小于C25，柱内纵向钢筋保护层厚度不小于25mm
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混凝土结构的耐久性，针对不同的环境类别对混凝土提出了基本要求，这些基本要求有最低混凝土强度等级、最大水胶比、最大含碱量
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