Abstract
In order to study the influence of the replacement ratio of recycled aggregate and the volume of waste fiber on the fracture performance of concrete, the three-point bending test is carried out on the waste fiber recycled concrete precast beams. Calculate the waste recycled fiber concrete fracture parameters according to the double-K fracture model. The results show that the fracture indexes of recycled fiber are related to the recycled aggregate replacement ratio and the volume content of waste fiber. The larger the replacement rate of recycled aggregate is, the smaller the fracture indexes of the specimens are. The volume content of waste fiber is 0.12%, which has the most significant effect on the fracture performance. The study shows that waste fiber can improve the fracture properties of recycled aggregate concrete.
Highlights
As the environmental and resource issues have become increasingly prominent, the application of recycled concrete conforms to the development trend of green building
Before waste fiber recycled concrete cracking, cracks expand slowly in the concrete, waste fiber plays a role in the junction in preventing the development of cracks
When the fiber length is 19mm and the volume content is 0.16%, the recycled aggregate ratio of 0 and 50% of the crack mouth opening displacement (CMODc) increased by 5.1% ~ 8.2%, the crack tip opening displacement (CTODc) increase from 8.3% to 18.1% and the KCI improve the 11.6%~17.7%
Summary
As the environmental and resource issues have become increasingly prominent, the application of recycled concrete conforms to the development trend of green building. There are micro cracks in recycled concrete, and it has been found that the mechanical properties of recycled concrete are worse than ordinary concrete [1,2,3]. Fiber can improve the mechanical properties of recycled concrete. How to control the generation and propagation of cracks effectively is the most important problem of fiber-recycled concrete. The waste fibers can constrain the development of micro-cracks. The research on fiber recycled concrete is still in service behavior, basic mechanical function and durability [7,8,9]. In this paper, using threepoint bending fracture teststhe study is carried out on the fracture properties of waste fiber recycled concrete with diffident replacement ratio of recycled aggregate and fiber volume
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