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采用强度试验、压汞法、气孔分析法、快速冻融法,以低温(3±0.2)℃养护下引气混凝土为研究对象,对混凝土的强度、孔隙结构及抗冻耐久性进行了研究。结果表明:在3℃养护下,随着含气量的提高,孔径均匀分布,显著改善了混凝土的内部孔隙结构,但比标准养护条件下同等含气量混凝土的孔结构粗化。为更好地阐述混凝土实际强度受含气量的影响,由孔隙结构可进一步推算出3℃养护下混凝土的实际抗压强度,并与标准养护条件下实际抗压强度对比,显示两者之间的不同。
The strength, pore structure and freeze-thaw durability of concrete were studied by using intensity test, mercury intrusion method, stomatal analysis method and rapid freezing and thawing method, and the aerated concrete under the condition of low temperature (3 ± 0.2) ℃ was studied. The results show that under 3 ℃ curing, with the increase of gas content, the pore size distribution is uniform, which significantly improves the internal pore structure of concrete, but coarsens the pore structure of concrete with the same gas content under standard curing conditions. In order to better explain the actual strength of concrete influenced by the gas content, the actual compressive strength of concrete under 3 ℃ curing can be extrapolated from the pore structure and compared with the actual compressive strength under standard curing conditions, showing that different.