The Study on the Evaluation of Soundness in Concrete Structure Damaged by Alkali-Aggregate Reaction

碱骨料反应损伤混凝土结构的安全性评价研究

基本信息

批准号：
61302059
负责人：
NISHIBAYASHI Shinzo
金额：
$ 8.64万
依托单位：
Tottori University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Co-operative Research (A)
财政年份：
1986
资助国家：
日本
起止时间：
1986 至 1987
项目状态：
已结题

项目摘要

This study was planned to clarify the mechanism of alkali-aggregate reaction (A.A.R.), to develop the testing method of determining the potential reactivity of aggregate, and to evaluate the soundness of damaged concrete structure due to A.A.R.In the mechanism of A.A.R., the effect of preventing for reaction of slag and flyash was mainly studied.In the study on testing method, the behaviors of concrete prism specimen using the reactive aggregate cured in autoclave and treated with the repeating dry and wet condition were clarified and the new rapid testing methods were proposed.In the evaluation of the soundness, the model reinforced concrete beams were fablicated by the reactive aggregate, and the effect of steel ratio and arrengement of steel bars on expansion and deterioration due to A.A.R., and the static and dynamic behaviors of the deteriorated beams were investigated. In the tests for RC beams, the some interesting results were obtaind as follow;A decrease of the static load bearing capacity due to A.A.R. was not observed.Compressive stress of 20-40 kgf/cm^2 were introduced to the concrete of the A.A.R. RC beam by constraint of expansion due to reinforcement. The diagonal cracks observed in the normal RC beam could not be clearly observed in the A.A.R. RC beam. Fatigue failure was caused by breaking of main reinforceing bars in all RC beams and the fatigue life was not affected by A.A.R.

该研究计划澄清碱性凝集反应（A.A.R.）的机制，以开发确定骨料的潜在反应性的测试方法，并评估A.A.R. a.a.r.r. a.a.r. a.a.r的机制的损坏的混凝土结构的健全性，该方法是防止Slag and Flyash distied of STECIENIDERIGETING的效果，该方法的构成了构成的研究，该方法是构成的，该方法是构成的，该方法是构成的，该方法是构成了研究的方法，该方法是构成了研究的方法，该方法是在A.A.R.中的作用。阐明了使用高压釜中固化并用重复干燥和潮湿条件处理的反应骨料的样品，并提出了新的快速测试方法。在评估声音时，通过反应性骨料进行了模型增强的混凝土束，并通过反应性骨料和钢制的钢制效果和钢制的效果和钢制的效果和均匀的膨胀效果和均应为A.AA.AA.AA.AA。研究了横梁恶化。在对RC梁的测试中，获得了一些有趣的结果，如下所示；由于A.A.R.未观察到。将20-40 kgf/cm^2的压力应引入A.A.R.的混凝土。 rc梁按限制因增强而构成的限制。在正常RC梁中观察到的对角线裂纹在A.A.R.中无法清楚地观察到。 RC梁。疲劳失败是由于所有RC梁中的主要加强杆破坏引起的，并且疲劳寿命不受A.A.R.的影响。