Abstract
Steel slag is regarded as one of the most widespread solid by-products of steel smelting with little commercial value. It can play a vital role in the construction industry especially in the field of transportation infrastructure construction. However, there are few evaluation systems established on the high-temperature deformation and low-temperature fracture behavior of steel slag rubber asphalt mixture (SSRAM). This study explores the performance of SSRAM by uniaxial penetration test, Semi-Circular Bending (SCB) test and evaluates test data through regression analysis. The uniaxial penetration test results shows that the failure deformation of SSRAM increases with the increase of steel slag content. According to the minimum allowable permanent deformation (RTS-min), the deformation of SSRAM should be controlled within 3 mm. Meanwhile, the cracking index of the SSRAM surface layer calculated at low temperature can meet the design requirements. The SCB test results show that the stress peak degradation rate (specimens with 10 mm notch are compared with 0 mm) of SSRAM with 40% steel slag content is 20.04%. That means proper steel slag content makes the stress peak degradation rate of SSRAM reaches the lowest value. The calculation results of fracture energy density (J1C) show that the steel slag additive reduced the fracture energy density of SSRAM. However, it is still proved that SSRAM with 40% steel slag has the best low-temperature fracture performance based on critical fracture toughness (K1C) and fracture stress peak. Furthermore, the crack propagation velocity parametric equation of SSRAM is proposed through fracture mechanics theory and the increase of velocity is exponential. Considering the high-temperature deformation resistance and low-temperature fracture property, the SSRAM surface layer with 40% steel slag content showed a batter application potential.
Highlights
Steel slag is regarded as one of the most widespread solid by-products of steel smelting, and it has been regarded as a challenge to environmental management in countries worldwide owing to the low recovery rate
In China, more than 90% of highways were constructed with asphalt pavements, which make the researches on steel slag asphalt mixture more important
Following the specification JTG D50-2017, the uniaxial penetration strength of the asphalt mixture should meet the requirements of Eq (1) when the base was stabilized by the inorganic binders
Summary
Steel slag is regarded as one of the most widespread solid by-products of steel smelting, and it has been regarded as a challenge to environmental management in countries worldwide owing to the low recovery rate (less than 50%). A series of environmental issues are caused, such as land occupation, and groundwater pollution, which in turn endangers human health [1]. Previous studies have extensively confirmed that the application of steel slag in the field of construction materials possesses considerable ecological benefits. Industrial by-products have played a crucial role in the road industry. Concrete with steel slag material can perform higher durability, mechanical properties. In China, more than 90% of highways were constructed with asphalt pavements, which make the researches on steel slag asphalt mixture more important
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