Performance of Concrete and Composite Beams Based on Stiffness-Regulated Solid Waste Coarse Aggregates
LI Chao
ZHOU Mei
YU Yanfu
ZHANG Kai
LI Yang
Abstract：To reduce the cracking risk of the flexural composite interface in solid waste coarse aggregate composite beams,hybrid solid waste coarse aggregates(HWCA)were prepared by combining high-stiffness iron ore waste coarse aggregates(IRCA)and low-stiffness spontaneous combustion coal gangue coarse aggregates(SGCA),and the corresponding HWCA concretes were made.The mechanical properties of HWCA concretes and flexural performance of composite beams were investigated,and the elastic ratio of aggregate to mortar was proposed as a criterion for determining the extreme values in the elastic modulus and Poisson's ratio of concretes.The results indicate that when the volume fraction of IRCA is 60%,the stiffness of HWCA is equivalent to that of natural coarse aggregate(NCA),and the difference in the elastic modulus of HWCA concretes decreases from 28.03%to 2.44%.When the volume fraction of IRCA is 68%and 92%,the compressive strength and elastic modulus of HWCA concretes begin to decrease from the peak values,respectively.The composite beams prepared with HWCA concretes can effectively mitigate the stress concentration at the composite interface and improve the crack resistance of the composite interface.
Keywords：solid waste coarse aggregateelastic moduluselastic ratio of aggregate to mortarconcretePoisson's ratiocomposite beam
Publication Date：2025-11-30
Online Publishing Date：2025-12-09(First online date of this platform, not the publication date of the document)
Pages：8( 1069-1076 )