Abstract
The pore structure is one of the major factors affecting the mechanical properties of waste fiber recycled concrete. In this article, the pore structure and strength performance of waste fiber recycled concrete are experimentally studied. The design variables are water–cement ratio, recycled aggregate replacement rate, waste fiber length, and volume fraction of waste fibers. The pore structure characteristic parameters of waste fiber recycled concrete are investigated using mercury intrusion porosimetry test and fractal theory. The complex distribution of pore structure in space is quantitatively described by fractal dimension, and the pore structure is comprehensively evaluated. The results show that the water–cement ratio has the largest influence on the pore structure, and the fiber length has the least influence. The optimum volume fraction of waste fibers is 0.12%. There is an obvious linear relationship between the pore volume fractal dimension and strength. With the increase in the fractal dimensions, the compressive and splitting tensile strengths increase. Macroscopic mechanical properties of waste fiber recycled concrete can be predicted by the pore structure.
Highlights
Concrete is one of the most widely used building materials in the world
The pore structure of waste fiber recycled concrete can be affected by water–cement ratio, recycled aggregate replacement ratio, and the addition of waste fibers
The concept of fractal dimension in fractal theory can be applied to the study of pore structure of concrete
Summary
Concrete is one of the most widely used building materials in the world. the concrete production consumes a lot of natural resources.[1,2] The application of recycled concrete is one of the most effective measures to develop green concrete and to realize the coordinated development of architecture, resources, and environment.[3]. Xiao et al.[4] proposed that the source of the original concrete had a greater impact on the recycled concrete than the age, and the strength performance of the recycled concrete came from different sources will be lower than that of the single source. The separate recovery of different-strength abandoned concrete can effectively improve the strength of recycled coarse aggregates and expand the application scope of recycled concrete. On this foundation, many researchers have carried out experimental research on the performance of recycled concrete. Scholars suggested that the properties of recycled aggregates were inferior to those of natural coarse aggregates, so the mechanical properties of recycled concrete were lower than those of ordinary concrete.[5,6,7]
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