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采用单边冻融和一维碳化的方法,在冻融循环和碳化交替作用下,研究混凝土耐久性能的演变规律及其与气孔结构变化的关系.结果表明,在交替作用早期,碳化能够阻止部分冻融产生的气孔结构衰变,但随着交替作用周期的延长,碳化不断消耗孔壁周围的钙电子层,破坏气孔体系的稳定.在交替作用早期,碳化有利于提高混凝土的抗冻耐久性,但到后期,碳化反而加速混凝土的冻融破坏.在实际工程中进行混凝土结构抗冻耐久性设计和使用寿命预测时,必须考虑和引进碳化与冻融的交替作用.
The uniaxial freeze-thaw and one-dimensional carbonation method was used to study the evolution of concrete durability and its relationship with the stomatal structure under the action of freeze-thaw cycles and carbonization alternation.The results show that in the early stage of alternation carbonation can prevent some The stomatal structure decayed by freezing and thawing, however, carbonation continued to consume the calcium electron layer around the pore wall and ruptured the stomatal stability because of the alternating period of action.Carbonation was beneficial to improve the antifreezing durability of the concrete in the early stage of alternating action, However, carbonization will accelerate the freeze-thaw damage of concrete in the later period.In the practical project, the design of antifreeze durability and prediction of service life of concrete structures must take into account and introduce the alternation of carbonization and freeze-thaw.