Behaviour of arched hybrid sustainable precast deep beams including green Concrete

Abstract

In recent years, the use of waste construction materials in the production of sustainable and cost-effective structural members such as deep beams has become more interesting. In the present work, a new sustainable model of a hybrid deep beam has been proposed and compared with the Horizontally hybrid model. Nine specimens have been tested experimentally under mid-span static loading up to failure. The arch region of the proposed model is made of steel fiber concrete (SFC), while other regions are made of concrete with recycled coarse aggregate (RCA) with three ratios of replacement (0%, 50%, and 100%). The specimens are grouped in three sets, each with three specimens representing the conventional model, the proposed model (ARC1), and the modified model (ARC2). The response has been studied in terms of cracking load, failure load, crack width, cracking pattern, and toughness. Results revealed that the proposed model ARC1 enhanced capacity by 6.7%, 6.8%, and 9.4% compared to the conventional hybrid model for the three value of RCA. While for the model ARC2 capacity improved by 13.5%, 19.6%, and 19.1. Regarding the toughness, enhancements of 12.5%, 18.7%, and 32.9% were obtained for the model ARC1 compared to the traditional hybrid model. While for model ARC2, it is enhanced by 25.2%, 51.1%, and 62.1% respectively. The proposed hybrid models may contribute in reduction the cost of construction and reduce the environmental effects of the waste of construction materials.

Keywords

• green (sustainable) concrete
• recycled-concrete aggregate
• arched hybrid model
• inclined stirrups