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

燃煤电厂产生的灰渣回收利用是当前环境保护的一个重要目标。针对建筑结构钢筋混凝土(RC)构件用量大的问题，提出了利用包括粉煤灰和苹果灰在内的粉煤灰进行建筑结构钢筋混凝土构件的资源化利用。为评估实际尺寸混凝土和高掺量粉煤灰混凝土构件的力学性能和抗震性能，进行了以下试验研究。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的可能性很大。大体积掺灰混凝土柱中材料性能的分布为了估算实际尺寸柱的力学性能分布，对大体积掺灰混凝土柱进行了芯孔取样的混凝土圆柱体材料试验。将这些结果与用标准程序养护的混凝土圆筒的试验结果进行了比较。高掺量煤粉混凝土柱足尺试验研究设计了三个足尺钢筋混凝土柱，考虑的参数为灰分掺量和混凝土强度。这些柱截面为800 mm方形，高度为2.4m，按现行抗震规范设计为受弯破坏类型。轴心受压试验表明，不同灰分含量的柱的受压特性相似。水平加载试验结果表明，大掺量粉煤灰足尺混凝土柱具有良好的抗震性能，如抗侧强度、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.