论文部分内容阅读
1940年首先于美国证实,由于碱骨料反应导致混凝土破坏,而英国还是最近对此有所认识。本文讨论了这种反应的性质,产生的原因及可能采取的防护措施。碱骨料反应是混凝土破坏的一种特殊原因。由于水泥中的碱金属氢氧化物溶液侵蚀某种硅质骨料生成一种碱金属硅酸钙肢体,后者遇水后发生膨胀使混凝土开裂。混凝土的碱骨料反应主要与水泥中的碱氧化物含量和硅质骨料的活性有关,一般认为当量Na_2O含量低于0.6％时,即使骨料活性较大也不会引起碱骨料反应。此外,混凝土结构的使用条件也
In the United States in 1940, it was first confirmed in the United Kingdom that the concrete was destroyed due to the reaction of alkali aggregates. This article discusses the nature of this reaction, the reasons for it, and possible protective measures. Alkaline aggregate reaction is a special cause of concrete damage. Since the alkali metal hydroxide solution in the cement erodes a siliceous aggregate, an alkali metal calcium silicate limb is generated, and the latter swells after the water contacts to crack the concrete. The alkali-aggregate reaction of concrete is mainly related to the content of alkali oxide in cement and the activity of siliceous aggregates. It is generally believed that when the equivalent Na2O content is less than 0.6%, alkali aggregate reaction will not be caused even if the aggregate activity is large. In addition, the conditions of use of the concrete structure are also