Abstract

The recycling process of construction and demolition wastes gained momentum with increasing ma-chinery, knowledge, and experience. The construction and demolition wastes contain a large amount of waste concrete. Many experimental and analytical studies have exhibited that recycled aggregate concrete (green concrete) is alternative to conventional concrete (natural concrete). In this study, the structural design of reinforced green concrete deep beams with four different recycled concrete aggre-gate ratios (25%, 50%, 75%, and 100%) was executed with the strut and tie method using the suggest-ed procedures by modern structural design codes. The analysis results of reinforced green concrete deep beams were compared with the reinforced conventional concrete deep beam results. Based on this study, the analysis result revealed that the structural behavior of the deep beam containing 25% recycled concrete aggregate agreed well with the conventional concrete deep beam. However, the rein-forced green concrete deep beams behaved differently from the conventional concrete deep beam as the recycled concrete aggregate increased. In addition, while the present code equations are valid for the deep beam with a 25% recycled concrete aggregate ratio, it was observed that using existing equa-tions in deep beams with 50%, 75%, and 100% recycled concrete aggregate ratios is inconvenient.

References

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