Abstract
Experimental investigations on the mechanical properties of ultra-high performance concrete (UHPC) incorporating two types of recycled steel fiber processed from waste tires and three types of industrial steel fiber were carried out for comparison. Mechanical properties of UHPC include compressive strength, splitting tensile strength, fracture energy, and elastic modulus. Their explosive spalling behaviors under high temperatures were also investigated. The results show that all types of steel fiber exhibit a beneficial effect on the mechanical properties and the anti-spalling behavior of UHPC, except that recycled steel fiber with rubber attached (RSFR) has a slightly negative effect on the compressive strength of UHPC. Compared to industrial steel fibers, recycled steel fibers have a more significant influence on improving the splitting tensile strength and fracture energy of UHPC, and the improvement of RSFR was much higher than that of recycled steel fiber without rubber (RSF). UHPC that incorporates industrial hooked-end steel fiber (35 mm in length and 0.55 mm in diameter) exhibits the best resistance to explosive spalling, and the second is the RSF reinforced UHPC. The positive relationship between the fracture energy and the anti-spalling behavior of steel fiber reinforced UHPC can be presented. These results suggest that recycled steel fiber can be a toughening material and substitute for industrial steel fibers to be used in ultra-high performance concrete, especially RSFR.
Highlights
Environmental concerns associated with waste rubber tires have attracted significant attention in recent years
The positive relationship between the fracture energy and the anti-spalling behavior of steel fiber reinforced UHPC can be presented. These results suggest that recycled steel fiber can be a toughening material and substitute for industrial steel fibers to be used in ultra-high performance concrete, especially RSFR
The results indicate that the explosive spalling of plain UHPC was extremely severe, as specimens
Summary
Environmental concerns associated with waste rubber tires have attracted significant attention in recent years. A number of related associations and councils have been established in numerous countries, such as the Tire Industry Association and the Rubber Division of the American Chemical. In view of environmental protection and economic benefit, more and more attention has been paid to the recycling of waste rubber tires. Recycling of waste rubber tires has focused on extracting the rubbers and steel fibers. It has been confirmed that the mechanical properties of concrete reinforced with recycled steel fiber from tires are comparable to those of concrete with industrial steel fibers [10]. The thickness of concrete pavement could be reduced by up to 26% due to the addition of recycled steel fibers when only taking into account their effect on the fatigue property [11]
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