Abstract
Various works have been carried out on both the physical and mechanical properties of rubberized concrete in previous research. But the chemical composition of rubberized concrete has not been fully investigated. The scanning electron microscopy (SEM) and energy-dispersive x-ray spectrum (EDX) analysis were used to determine the element composition and the peak intensity of chemical elements in the waste rubber concrete. The SEM and EDX analysis results showed that, ferrous iron, oxygen, calcium, and silicon were the dominant elements, and these elements reduced as more waste rubber were added to the concrete. Carbon and sulphur elements increased as rubber crumbs were added to the rubberized concrete. The work concluded that the presence of rubber crumb in the concrete samples contributed to both mechanical and chemical changes in the property of rubberized concrete.
Highlights
Rubberized concrete is a product of the replacement of some concrete raw materials with rubber, many work have been carried out in the area of rubberized concrete where, fine and coarse aggregates were fully or partially replaced by rubber waste in concrete
0 0 7 14 21 28 35 42 49 56 63 70 Test days. It was not the same case for all the samples that contained rubber crumb, the difference between the 28 and 70 days strength for C4 sample was 7.19 N/mm2, and that of C8 was 2.92 N/mm2, specimen C12 has a difference of 3.70 N/mm2 while that of C16 was 3.9 N/ mm2. These results imply that concrete samples with rubber crumb in it have a higher rate of strength increments than the control sample after the 28 days test
The investigation into the effect of rubber crumb on the mechanical and chemical properties has revealed that: 1. There was a general reduction in concrete strength as more rubber crumbs were added to the concrete and these results support the findings of previous research on the mechanical properties of rubberized concrete
Summary
Rubberized concrete is a product of the replacement of some concrete raw materials with rubber, many work have been carried out in the area of rubberized concrete where, fine and coarse aggregates were fully or partially replaced by rubber waste in concrete. Most of these researchers have focused majorly on the effect of rubber or sometimes plastic waste on the physical and mechanical properties of concrete, the aim of these past researched works cannot be disputed because it is believed that the most important characteristic of concrete is the mechanical properties. The study concluded that waste rubber fiber can be conveniently used as a material to improve the ductility and impact resistance of concrete, and demonstrates that the silica fume improved the impact resistance and reduces the ductility of rubberized concrete
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