Compressive Behaviors of Prisms Made of Demolished Concrete Lumps and Fresh Concrete

Applied Sciences

Zongping Chen¹  Bo Wu²  Yong Yu² 

[1] College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China;State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou 510640, China;

关键词: demolished concrete lumps;    fresh concrete;    prisms;    compressive behaviors;    size effects;    shape effects;   

DOI  :  10.3390/app8050743

来源: DOAJ

【 摘 要 】

Directly adopting coarsely crushed demolished concrete lumps (DCLs) with pouring concrete (referred to as fresh concrete, FC) in new structural members has been demonstrated to be more efficient and environmental than the traditional approach of recycling waste concrete as coarse aggregate particles. In this study, 45 prisms made of FC and DCLs were tested under axial compressive loading up to failure. The varied parameters included the dimensions of the prisms, the replacement ratio of DCLs, and the characteristic size of the lumps. The compressive performance of 36 cubes and cylinders was also experimentally examined for comparison. A formula was developed to predict the strength of compound concrete prisms filled with DCLs. Empirical formulas were also established relating a prism’s strength with its elastic modulus and peak strain. It was found that: (a) when the replacement ratio is between 20% and 40%, the strength of a prism is about 1.13 that of a cylinder, due to the casting direction of the prism being different from that of the cylinder; (b) as the size of filler lumps increases relative to the size of the specimen, the strength of prisms decreases faster than that of cylinders, which weaken faster than cubes; and (c) due to the coupling effect of the aggregate size of FC and the specimen size, the compressive strength of prisms first increases with their size and then declines gradually.

【 授权许可】

Unknown