蒸养混凝土的表层伤损效应

发布时间：2018-05-03 05:30

本文选题：蒸养混凝土 + 毛细吸水性　；参考：《建筑材料学报》2014年06期

【摘要】：通过试验研究蒸养混凝土的毛细吸水性和氯离子扩散性能,分析蒸养混凝土表层与内部微观结构特征的差异,探讨了蒸养混凝土的表层伤损效应及其机理.结果表明:相对于标养混凝土,蒸养混凝土表层位置处(由表及里约10mm范围)的毛细吸水性及氯离子扩散速率均基本较大;蒸养过程会对混凝土表层微观结构造成显著的伤损,且这种伤损主要集中在混凝土由表及里约10mm范围;蒸养混凝土表层区较大的温度梯度及肿胀变形是蒸养混凝土产生表层伤损效应的根本原因;粉煤灰和矿渣掺入可在一定程度上降低蒸养作用对混凝土表层造成的伤损程度,有效提高蒸养混凝土抵抗水及氯离子迁移的能力.
[Abstract]:The capillary absorptivity and chloride ion diffusion properties of steamed concrete are studied through experiments. The differences between the microstructure of the surface layer and the internal microstructure of steamed concrete are analyzed. The surface damage effect and its mechanism of steamed concrete are discussed. The results show that the capillary absorptivity and chloride ion diffusion rate at the surface of the steaming concrete (from the surface to the 10mm range) are relatively large compared with the standard concrete, and the steaming process will cause significant damage to the microstructure of the surface layer of the concrete. This kind of damage is mainly concentrated in the range of concrete from surface to inside about 10mm, and the large temperature gradient and swelling deformation in the surface area of steaming concrete are the fundamental reasons for the surface damage effect of steaming concrete. The addition of fly ash and slag can reduce the damage caused by steaming on the surface of concrete to a certain extent and effectively improve the ability of steaming concrete to resist the migration of water and chloride ions.
【作者单位】：宁波大学建筑工程与环境学院;中南大学土木工程学院;
【基金】：国家重点基础研究发展计划(973计划)项目(2013CB036201) 国家自然科学基金资助项目(51278255,51478227) 浙江省自然科学基金资助项目(LY12E08006) 高速铁路建造技术国家工程实验室开放课题资助项目(HSR2013033)
【分类号】：TU528

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