南疆盐渍土地区混凝土抗冻性能研究

发布时间：2018-04-02 06:12

  本文选题：盐渍土　切入点：混凝土　出处：《长江科学院院报》2017年05期

【摘要】：通过实地调研发现,新疆南疆盐渍土地区许多混凝土建(构)筑物均不同程度地存在由盐蚀-冻融引起的混凝土表面剥蚀、开裂和疏松、粗骨料大面积裸露、盐结晶析出等病害。引起该地区混凝土产生盐蚀-冻融病害的主要原因有3个方面:(1)混凝土表层和内部的孔隙水冻结产生的拉应力;(2)渗入混凝土内部的盐类结晶产生的拉应力;(3)硫酸盐与水泥水化产物发生化学反应产生的拉应力。这些因素综合作用造成混凝土由表及里逐渐损伤、破坏和解体。通过调整混凝土水胶比、优化含气量和搅拌时间、优选骨料、使用抗硫酸盐水泥、增厚混凝土表面沥青胶泥防腐涂层厚度等工程措施,可有效提升南疆盐渍土地区混凝土结构抵抗盐蚀和冻融破坏的能力。
[Abstract]:Through field investigation, it is found that many concrete structures in the saline soil area of southern Xinjiang exist, in varying degrees, the surface erosion, cracking and loosening of concrete caused by salt corrosion and freeze-thaw, and extensive exposure of coarse aggregate. The main causes of salt corrosion-freeze-thaw disease of concrete in this area are three aspects: 1) tensile stress caused by freezing pore water in surface and interior of concrete) salt crystallization infiltrating into concrete interior. The tensile stress caused by the chemical reaction between the sulfate and the hydration product of cement caused by the combined action of these factors resulted in the gradual damage of concrete from the outside to the inside. By adjusting the water / binder ratio of concrete, optimizing air content and stirring time, selecting aggregates, using sulphate resistant cement, increasing the thickness of asphalt cement coating on concrete surface, etc. It can effectively enhance the ability of resisting salt corrosion and freeze-thaw damage of concrete structure in saline soil area of southern Xinjiang.
【作者单位】： 塔里木大学水利与建筑工程学院;武汉大学土木建筑工程学院;第一师阿拉尔市建筑材料检测中心;
【基金】：兵团应用基础研究计划项目(2016AG017) 塔里木大学校长基金重大培育项目(TDZKPY201401);塔里木大学校长基金青年项目(TDZKQN201612)
【分类号】：TU528
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本文编号：1699126