Mechanical Properties and Seismic Behavior of RC Members Containing High Volume Coal Ash

燃煤电厂产生的煤灰的回收利用是近年来环境保护的一个非常重要的目标。为了解决粉煤灰的大量消耗问题，提出了粉煤灰和苹果灰在建筑结构钢筋混凝土构件中的应用。进行了下述实验研究，以评估真实的尺寸的混凝土和含有高体积粉煤灰的RC构件的力学和抗震特性。试验结果表明，大掺量粉煤灰混凝土用于钢筋混凝土建筑结构具有很大的可能性.大掺量粉煤灰混凝土圆柱体材料性能的分布为了估算真实的尺寸圆柱体的力学性能分布，对从大掺量粉煤灰混凝土圆柱体中取样的混凝土圆柱体进行了材料试验。并与标准养护混凝土柱的试验结果进行了比较.大掺量粉煤灰钢筋混凝土柱足尺试验本研究制作了三根足尺钢筋混凝土柱，考虑的参数为粉煤灰掺量和混凝土强度。截面为800mm2、高为2.4m的柱按现行抗震规范设计为弯曲破坏。轴向加载试验表明，无论煤灰含量如何，这些柱的压缩特性相似。试验结果表明，大掺量粉煤灰混凝土柱具有足够的抗震性能，如抗侧承载力、延性和耗能能力。

Recycling of coal ash produced by coal-fired power plants is recently a very significant objective for the environmental conservation. Utilization of coal ash, including both fly ash and cider ash, to reinforced concrete (RC) members for building structures was proposed in this research, in order to consume the large quantity of this product. Experimental studies mentioned below were carried out to estimate mechanical and seismic characteristics of real size concrete and RC members containing high volume coal ash. Test results indicated that there was strong possibility of using concrete containing high volume coal ash for RC building structures.1. Distributions of material properties in a full-scale concrete column containing high volume coal ashMaterial tests of concrete cylinders sampled from a full-scale concrete column containing high volume coal ash by core borings were executed in order to estimate the distributions of mechanical properties in a real size column. Those results were compared with test results of concrete cylinders cured in standard procedures.2. Full-scale tests of RC columns containing high volume coal ashThree full-scale RC columns were constructed for this study, while considered parameters were coal ash content and concrete strength. Those columns, of which the section was 800mm square and the height was 2.4m, were designed as flexural failure types according to the current seismic code. Axial loading tests revealed that compressive characteristics of those columns were similar regardless of coal ash content. Test results of lateral loading tests confirmed that full-scale RC columns containing high volume coal ash had sufficient seismic performances, such as lateral strength, ductility and energy dissipation capacity.