Effect of Steel Slag Aggregate on Pavement and Flame-Retardant Performance of Warm-Mixed Flame-Retardant Asphalt Concrete

Ren, Yanfei; Chen, Meizhu; Yang, Tong; Wu, Shaopeng; Wang, Kaifeng

doi:10.3390/ma14030635

Cited by 17 publications

(10 citation statements)

References 12 publications

(12 reference statements)

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“…The added steel slag raises the ignition temperature and delays the ignition time of the asphalt mixture. 4 The optimal contents of magnesium hydroxide (MH), phosphorus, and decabromodiphenyl ethane in asphalt have been identified to decrease its flammability. The incorporation of these flame retardants has positive influences on the flammability of asphalt.…”

Section: ■ Introductionmentioning

confidence: 99%

Suppressing Actions of Inorganic Flame Retardants on the Pyrolysis Behavior of Asphalt

Wang,

Xia,

2023

Langmuir

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To understand the suppressing actions of inorganic compound flame retardant (CFR) on the pyrolysis behavior of asphalt, five halogen-free flame retardants, such as expanded graphite, aluminum hydroxide, magnesium hydrate, calcium hydroxide, and microencapsulated red phosphorus, were selected to match the pyrolysis temperature ranges of four asphalt components, respectively. The pyrolysis behaviors, volatile emissions, and pyrolysis residues from asphalt and CFR-modified asphalt (FR asphalt) were compared. Also, the effects of CFR on the microscopic morphology, microstructures, and micromechanical performance of asphalt were analyzed. The high-temperature stability of asphalt is increased by the presence of CFR, and there is a flame-retardant constituent in CFR that suppresses the pyrolysis of each component in the overall asphalt pyrolysis process. Additionally, the FR asphalt pyrolysis process is endothermic. The added CFR retards the asphalt pyrolysis process. The formation of the surface carbon layer impedes heat transfer. Also, the volatile emissions during asphalt pyrolysis are reduced by the presence of CFR. The added CFR promotes an increase in the size of the asphalt microstructure. The surface of FR asphalt becomes rougher and more rugged than that of asphalt. Finally, the elastic modulus, deformation resistance, and micromechanical performance of asphalt are increased as the level of FR presence is increased. FR asphalt has a higher adhesive force, which is conducive to increasing the adhesivity of FR asphalt with mineral aggregate in the FR asphalt mixture.

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Section: ■ Introductionmentioning

confidence: 99%

Suppressing Actions of Inorganic Flame Retardants on the Pyrolysis Behavior of Asphalt

Wang,

Xia,

2023

Langmuir

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“…Numerous studies were conducted on steel slag which used in asphalt mixture, Ziaee et al selected Electric Arc Furnace Slag (EAFS) as coarse aggregates in Warm Mix Asphalt (WMA) mixtures, and their test results showed that EAFS can improve the mechanical properties of WMA mixtures [3]. Ren et al [4] proposed a method to characterize the combustion degree and evaluate the flame-retardant performance of the steel slag asphalt concrete, it was found that steel slag asphalt concrete has excellent flame-retardant performance and is a suitable choice for tunnel pavement. The proper content of steel slag would improve the indirect tensile strength [5], high-temperature performance [6], low-temperature fatigue life [7,8], and it is far from that.…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Deformation and Low-Temperature Fracture Behavior of Steel Slag Rubber Asphalt Mixture Surface Layer

Shu¹,

Wu²,

Chen³

et al. 2022

Journal of Renewable Materials

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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 (R TS-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 (J 1C ) 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 lowtemperature fracture performance based on critical fracture toughness (K 1C ) 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.

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“…Along with the rapid development of the transportation industry, the traffic volume has been growing rapidly. The ratio of overloaded vehicles is large, which leads to serious ruts and other diseases at highway intersections and uphill sections, and seriously affects the comfort and safety of driving [ 1 , 2 , 3 , 4 ]. Qingchuan rock asphalt (QRA) is not only rich in reserves but also has the advantages of high nitrogen content, good durability, and good compatibility with base asphalt.…”

Section: Introductionmentioning

confidence: 99%

Research on High-Temperature Evaluation Indexes and Performance of Qingchuan Rock-SBS Composite Modified Asphalt

Hao

Zhuang

et al. 2022

Materials

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The phenomenon of structural destabilization damage to asphalt pavement is becoming increasingly serious as a result of high temperatures and heavy traffic. Considering the advantages of Qingchuan rock asphalt (QRA) in its durability, high-temperature rutting resistance, and good compatibility with asphalt, it was proposed to compound rock asphalt with SBS to ameliorate the high-temperature performance of asphalt. In this study, DSR and BBR were used to determine the rheological properties of Qingchuan rock-modified asphalt (QRMA) and Qingchuan rock–SBS-modified asphalt (QRA-SBSMA), and the optimum blending amount of rock asphalt was determined based on the PG classification results. Secondly, four different structures of ‘30 mm AC-10 upper layer (70-A, QRMA, SBSMA, QRA-SBSMA) + 50 mm AC-16 lower layer (70-A)’ double-layer composite specimens were prepared. Multiple high-temperature performance evaluation indexes (G*/sinδ, Ds, rutting depth, micro-strain, Fn, modulus) were used to assess the improvement effect of QRA. Finally, using a 1/3 scale accelerated loading testing machine, we simulated high-temperature, water, and high-temperature coupled environments to assess the impact of high temperature and water on the performance of QRMA and QRA-SBSMA, respectively. The findings demonstrated that QRA can increase the PG classification of 70-A and SBSMA as well as its resistance to high-temperature deformation. Multi-index comprehensive evaluation methods were used to consummate the asphalt high-temperature evaluation system. The QRA-SBSMA had the smallest rutting depth and creep rate and the largest dynamic modulus, characterizing its ability to optimally resist high-temperature rutting and deformation.

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Effect of Steel Slag Aggregate on Pavement and Flame-Retardant Performance of Warm-Mixed Flame-Retardant Asphalt Concrete

Cited by 17 publications

References 12 publications

Suppressing Actions of Inorganic Flame Retardants on the Pyrolysis Behavior of Asphalt

Suppressing Actions of Inorganic Flame Retardants on the Pyrolysis Behavior of Asphalt

High-Temperature Deformation and Low-Temperature Fracture Behavior of Steel Slag Rubber Asphalt Mixture Surface Layer

Research on High-Temperature Evaluation Indexes and Performance of Qingchuan Rock-SBS Composite Modified Asphalt

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