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Journal ArticleDOI: 10.1016/J.JHAZMAT.2020.124441

Environmental performance and functional analysis of chip seals with recycled basic oxygen furnace slag as aggregate.

05 Mar 2021-Journal of Hazardous Materials (Elsevier)-Vol. 405, pp 124441-124441
Abstract: Resource utilization of industrial waste is a significant global challenge. Steel slag, a typical industrial by-product in the steel-making process, pollutes the environment and causes ecological deterioration. In this study, steel slag was recycled in chip seals as the aggregate, and the functional and environmental performance of the chip seal with recycled steel slag was determined. Economic costs were also discussed and compared with conventional surface layers. The results indicated that recycling steel slag as the aggregate in chip seal has a lower pollution risk and higher environmental benefits compared with those used for landfilling and dumping. Steel slag can significantly increase the heating and de-icing efficiencies of chip seal compared with basalt, particularly for microwave heating. The self-bonded function represented by the durability of aggregate retention can be enhanced by steel slag. The cost of the chip seal containing steel slag and steel fiber is only increased by 0.14 USD/m2 than that of ordinary chip seal, indicating a remarkable economic efficiency of chip seal with de-icing and self-bonded functions.

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Topics: Slag (58%), Basic oxygen steelmaking (53%)

10 results found

Open accessJournal ArticleDOI: 10.3390/MA14040869
Minghua Wei1, Shaopeng Wu1, Haiqin Xu1, Hechuan Li2  +1 moreInstitutions (2)
11 Feb 2021-Materials
Abstract: Steel slag is the by-product of the steelmaking industry, the negative influences of which prompt more investigation into the recycling methods of steel slag The purpose of this study is to characterize steel slag filler and study its feasibility of replacing limestone filler in asphalt concrete by evaluating the resistance of asphalt mastic under various aging methods Firstly, steel slag filler, limestone filler, virgin asphalt, steel slag filler asphalt mastic and limestone filler asphalt mastic were prepared Subsequently, particle size distribution, surface characterization and pore characterization of the fillers were evaluated Finally, rheological property, self-healing property and chemical functional groups of the asphalt mastics with various aging methods were tested via dynamic shear rheometer and Fourier transform infrared spectrometer The results show that there are similar particle size distributions, however, different surface characterization and pore characterization in the fillers The analysis to asphalt mastics demonstrates how the addition of steel slag filler contributes to the resistance of asphalt mastic under the environment of acid and alkaline but is harmful under UV radiation especially In addition, the pore structure in steel slag filler should be a potential explanation for the changing resistance of the asphalt mastics In conclusion, steel slag filler is suggested to replace limestone filler under the environment of acid and alkaline, and environmental factor should be taken into consideration when steel slag filler is applied to replace natural fillers in asphalt mastic

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Topics: Asphalt concrete (57%), Dynamic shear rheometer (56%), Filler (packaging) (53%) ... show more

1 Citations

Journal ArticleDOI: 10.1016/J.CONBUILDMAT.2021.123691
Qi Jiang1, Na Li1, Fei Yang, Ren Yanfei1  +4 moreInstitutions (2)
Abstract: Warm-mix flame retardant asphalt (WF-A) is widely used in tunnel pavement owing to its positive construction and workability, as well as excellent flame retardant performance. When flame retardant (FR) improves the flame retardancy of asphalt binders and warm mix agent reduces the construction temperatures, the combined effects of the two additives on asphalt binders’ performances need to be studied. In this study, through orthogonal experimental design, limiting oxygen index (LOI) test and viscosity test, the optimum WF-A was selected. Afterward, the service performances of WF-A were comparative analyzed with warm mixing asphalt, SBS modified asphalt and flame retardant asphalt, including construction temperatures, high-temperature rheological property and aging resistance. Additionally, the characteristics of volatile organic compounds (VOC) emission are assessed by gas chromatography mass spectrometry (GC–MS). The results show that the optimum WF-A is that with the content ratio of 3.5% EC-120 and 8% FRMAX under the mixing temperature of 150 °C, and warm mix agent (EC-120) can obviously reduce the high-temperature viscosity of SBS modified asphalt binder, and increase the high-temperature fluidity; flame retardant (FRMAX) adversely affects the viscosity reducing effect of EC-120. The additions of the two additives are not conductive to the aging resistance of asphalt. Besides, both EC-120 and FRMAX have the effect of reducing asphalt fumes, and the optimum WF-A can reduce VOC emissions by 45.5% compared with SBS modified asphalt binder. The study provides significant references for further applying WF-A in the sustainable and safe construction of road networks.

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Topics: Asphalt (52%), Fire retardant (52%)

Journal ArticleDOI: 10.1016/J.CONBUILDMAT.2021.125133
Ming Cheng1, Meizhu Chen1, Shaopeng Wu1, Tianyuan Yang1  +2 moreInstitutions (1)
Abstract: Huge amounts of waste glass are produced every year in China, which brings great pressure on the environment. Meanwhile, a large number of natural aggregates are required for highway construction every year. In this study, it is intended to prepare asphalt micro-surfacing materials using waste glass as aggregate and evaluate their performance. The morphology of basalt and waste glass was quantitatively analyzed through aggregate image measurement system to characterize the morphological differences. In addition, the wet stripping test, wet track abrasion test, wheel load test, sand patch test and British pendulum test were used to investigate the resistance to the action of water, the wear performance, rutting resistance and skid resistance of asphalt micro-surfacing mixtures. The results indicate that the two-dimensional (2D) form of waste glass is more abundant than that of basalt, and as the content of waste glass increases, the British pendulum number (BPN) value and the texture depth (TD) value of micro-surfacing mixtures increase, which means that the addition of waste glass can improve the skid resistance ability of micro-surfacing mixtures to some extent. The abrasion loss, lateral and vertical displacement are all increased after replacing basalt with waste glass due to its brittleness and weak bonding. Considering the feasibility of mechanical properties, it is recommended that the maximum volume amount of fine waste glass and coarse waste glass should be less than 15% and 10%, respectively. The potential use of waste glass can alleviate the overconsumption of natural resources and is a good choice for applying in micro-surfacing pavement materials.

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36 results found

Open accessJournal Article
01 Jan 2001-NCHRP Report
Abstract: This report documents the results of a study on the applicability of Superpave specification (AASHTO MP1, "Standard Specification for Performance Graded Asphalt Binder") and protocols developed for asphalt cements to modified asphalt binders. A survey indicated that, although the majority of state agencies intend to increase future use of modified binders, very little is known about the binders' behavior. In addition, there are serious concerns regarding their storage stability, aging, and mixing and compaction temperatures. Using advanced rheological characterization of a selected set of binders and mixtures, it was found that the binder specification parameters in the current AASHTO MP1 are not adequate to rank the modified binders according to their contribution to mixture damage. The concepts of viscous flow and energy dissipation were explored in an effort to derive binder parameters that more effectively relate binder to mixture behavior. Suggested test protocols and specification parameters were developed to integrate the new concepts into a future specification. A direct measure of the glass transition behavior and the use of a design-cooling rate were identified as reliable estimators of the binders' role in thermal cracking. Also, a storage stability test and a particulate additive test were developed and proposed as standard tests. The concept of low shear viscosity was introduced for the determination of laboratory mixing and compaction temperatures to avoid excessive heating and to consider the shear-rate dependency of modified binders. Revisions to the binder grading system are recommended to include a three-level grading scheme. A field validation plan is proposed to test the validity of these concepts and to derive reliable specification criteria and limits.

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504 Citations

Journal ArticleDOI: 10.1016/J.JHAZMAT.2008.09.105
Perviz Ahmedzade1, Burak Sengoz2Institutions (2)
Abstract: This paper presents the influences of the utilization of steel slag as a coarse aggregate on the properties of hot mix asphalt. Four different asphalt mixtures containing two types of asphalt cement (AC-5; AC-10) and coarse aggregate (limestone; steel slag) were used to prepare Marshall specimens and to determine optimum bitumen content. Mechanical characteristics of all mixtures were evaluated by Marshall stability, indirect tensile stiffness modulus, creep stiffness, and indirect tensile strength tests. The electrical sensitivity of the specimens were also investigated in accordance with ASTM D257-91. It was observed that steel slag used as a coarse aggregate improved the mechanical properties of asphalt mixtures. Moreover, volume resistivity values demonstrated that the electrical conductivity of steel slag mixtures were better than that of limestone mixtures.

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Topics: Aggregate (composite) (57%), Asphalt (53%), Cement (52%)

323 Citations

Journal ArticleDOI: 10.1016/J.CONBUILDMAT.2009.12.019
Abstract: In this research, an electrically conductive porous asphalt concrete, used for induction heating, was prepared by adding electrically conductive filler (steel fibers and steel wool) to the mixture. The main purpose of this paper is to examine the electrical conductivity and the indirect tensile strength of this conductive porous asphalt concrete and prove that it can be heated via induction heating. It was found that, to make porous asphalt concrete electrically conductive, long steel wool with small diameter is better than short steel fibers with bigger diameter. However, steel fibers with short length and big diameter have better strength reinforcement capability than steel wool with long length and small diameter. It was also proved that conductive porous asphalt concrete containing steel wool can be easily heated via induction heating. Finally, 10% (by volume of bitumen) of steel wool type 000 was proposed as an optimal content in porous asphalt concrete to obtain an optimal conductivity, a good induction heating rate and an acceptable indirect tensile strength. It is expected that the autogenous healing capacity of asphalt concrete will be enhanced with the increase of temperature during induction heating.

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Topics: Steel wool (65%), Asphalt concrete (59%), Induction heating (55%) ... show more

174 Citations

Journal ArticleDOI: 10.1016/J.MATDES.2016.05.095
15 Sep 2016-Materials & Design
Abstract: This paper aims to evaluate the effect of microwave and induction heating on the self-healing of asphalt mixture test samples. With this purpose, dense asphalt mixtures with four different percentages of steel wool fibres have been prepared to build semi-circular asphalt test samples. Asphalt self-healing has been characterised as the three-point bending strength of test samples before and after healing. This process was repeated ten times in every test sample. Moreover, self-healing was induced in the semi-circular test samples by heating them under microwave and induction. Besides, the chemical degradation of asphalt mixture under microwave and induction heating was monitored by measuring the mass of test samples before and after the heating process. It was found that microwave technology is more effective than induction heating to heal cracks in asphalt roads. Furthermore, the healing level of asphalt mixtures reduced with every healing cycle, until the test specimens could not resist more damage-healing cycles. It could be seen that microwave heating degrades bitumen, and increases the porosity of asphalt mixture. Finally, it was hypothesised that air voids in mixture play an important role in asphalt self-healing by increasing the internal pressure and mobility of bitumen during the heating process.

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Topics: Asphalt (52%), Induction heating (52%), Steel wool (52%)

147 Citations

Journal ArticleDOI: 10.1016/J.CONBUILDMAT.2012.12.007
Abstract: This paper presents the results of a research into the technical viability of heating asphalt mixtures with microwaves and how the microwaves influence the heating process of the different variables involved. Various past studies have established that elevated temperatures during rest periods of an asphalt mixture promote self-healing. In addition, recent investigations have been done regarding the heating of asphalt mixtures by means of electromagnetic induction: steel wool and graphite additives where introduced to the mixtures, improving their conductivity and thus increasing their susceptibility to electromagnetic induction. In this study, heating to promote self-healing is achieved with microwaves. The optimal steel wool content established for this study is around ten times less than that recommended for heating by electromagnetic induction, which in practice could mean an important reduction in costs. Additionally, the amount of electricity used by microwave devices is much less than that required to produce a similar effect by electromagnetic induction.

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Topics: Steel wool (55%)

128 Citations

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