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为研究不同类型混凝土在海水中的抗冻性能,笔者利用混凝土快速冻融试验机,对相同水胶比的大掺量粉煤灰混凝土和普通引气混凝土分别在海水中进行了0、100、200、300、400次快速冻融循环试验。测得了冻融循环后粉煤灰混凝土和普通引气混凝土的质量损失、动弹性模量以及单轴抗压强度。根据试验结果,系统地分析了冻融循环次数对两种不同类型混凝土单轴抗压强度的影响。结果表明:随冻融循环次数的增加,两种类型混凝土的单轴强度均逐渐降低,但大掺量粉煤灰混凝土强度降低的程度比普通引气混凝土小,具有更高的抗冻融循环能力。
In order to study the frost resistance of different types of concrete in seawater, the author makes use of the rapid freezing and thawing test machine of concrete to carry on the experiments of 0,100 in the seawater with high content of fly ash concrete and ordinary air- 200,300,400 rapid freeze-thaw cycles. The mass loss, dynamic elastic modulus and uniaxial compressive strength of fly ash concrete and ordinary air-entrained concrete after freeze-thaw cycle were measured. According to the experimental results, the influence of the number of freeze-thaw cycles on the uniaxial compressive strength of two different types of concrete was systematically analyzed. The results show that the uniaxial strength of the two types of concrete decreases with the increase of the number of freeze-thaw cycles, but the strength of high-volume fly ash concrete decreases less than that of ordinary air-entrained concrete and has a higher resistance to freeze-thaw cycles ability.