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Cathode-ray-tube (CRT) is the ingredient of glass used in obsolescent televisions or computer monitors. CRT glass contains a considerable amount of heavy metals, and the landfilling of CRT glass is significantly harmful to the environment. In an effort to recycle waste CRT glass instead of landfilling it, recycled CRT glass powders were introduced to asphalt binders as a modifier in this preliminary investigation. The recycled CRT glass was processed to a particle size smaller than 0.075 mm and mixed with asphalt binder (PG 58–28) to produce asphalt mastics with four different concentrations (0, 5, 10, and 15 wt%). The rheological performance was characterized with the rotational viscosity (RV), dynamic shear rheometer (DSR), and multiple stress creep recovery (MSCR) tests. The fatigue performance was evaluated by linear amplitude sweep (LAS) test. Meanwhile, the low-temperature properties were measured by the asphalt binder cracking device (ABCD). The hazard materials leaching test was applied to evaluate the leaching potential of lead content into the external environment due to the high lead content in the modified asphalt. The test results revealed that the increase of CRT glass powder content improved the energy of activation compared with that of virgin binder, as well as the resistance of permanent deformation. Furthermore, the incorporation of CRT glass powder may slightly increase the fatigue life of asphalt because of the improved physicochemical interaction between glass and bitumen. The low-temperature cracking temperature first decreased with the increase of CRT glass powder content and then increased as the CRT content increased further. The leaching test demonstrated that the CRT glass powders incorporated into asphalt binders represented a lower lead leaching content than that of the original CRT glass powder, where the lead leaching amount of CRT glass modified asphalt binder is obviously lower than the specified level of 5 mg/L. Therefore, it is possibly acceptable to recycle CRT glass powders in asphalt binders as an additive as an environmental-friendly recycling method, in which the optimal addition content of CRT glass powders could be up to 10% (wt.).
Dongzhao Jin; Jiaqing Wang; Lingyun You; Dongdong Ge; Chaochao Liu; Hongfu Liu; Zhanping You. Waste cathode-ray-tube glass powder modified asphalt materials: Preparation and characterization. Journal of Cleaner Production 2021, 314, 127949 .
AMA StyleDongzhao Jin, Jiaqing Wang, Lingyun You, Dongdong Ge, Chaochao Liu, Hongfu Liu, Zhanping You. Waste cathode-ray-tube glass powder modified asphalt materials: Preparation and characterization. Journal of Cleaner Production. 2021; 314 ():127949.
Chicago/Turabian StyleDongzhao Jin; Jiaqing Wang; Lingyun You; Dongdong Ge; Chaochao Liu; Hongfu Liu; Zhanping You. 2021. "Waste cathode-ray-tube glass powder modified asphalt materials: Preparation and characterization." Journal of Cleaner Production 314, no. : 127949.
Cold in-place recycling (CIR) asphalt mixtures are an attractive eco-friendly method for rehabilitating asphalt pavement. However, the on-site CIR asphalt mixture generally has a high air void because of the moisture content during construction, and the moisture susceptibility is vital for estimating the road service life. Therefore, the main purpose of this research is to characterize the effect of moisture on the high-temperature and low-temperature performance of a CIR asphalt mixture to predict CIR pavement distress based on a mechanistic–empirical (M-E) pavement design. Moisture conditioning was simulated by the moisture-induced stress tester (MIST). The moisture susceptibility performance of the CIR asphalt mixture (pre-mist and post-mist) was estimated by a dynamic modulus test and a disk-shaped compact tension (DCT) test. In addition, the standard solvent extraction test was used to obtain the reclaimed asphalt pavement (RAP) and CIR asphalt. Asphalt binder performance, including higher temperature and medium temperature performance, was evaluated by dynamic shear rheometer (DSR) equipment and low-temperature properties were estimated by the asphalt binder cracking device (ABCD). Then the predicted pavement distresses were estimated based on the pavement M-E design method. The experimental results revealed that (1) DCT and dynamic modulus tests are sensitive to moisture conditioning. The dynamic modulus decreased by 13% to 43% at various temperatures and frequencies, and the low-temperature cracking energy decreased by 20%. (2) RAP asphalt incorporated with asphalt emulsion decreased the high-temperature rutting resistance but improved the low-temperature anti-cracking and the fatigue life. The M-E design results showed that the RAP incorporated with asphalt emulsion reduced the international roughness index (IRI) and AC bottom-up fatigue predictions, while increasing the total rutting and AC rutting predictions. The moisture damage in the CIR pavement layer also did not significantly affect the predicted distress with low traffic volume. In summary, the implementation of CIR technology in the project improved low-temperature cracking and fatigue performance in the asphalt pavement. Meanwhile, the moisture damage of the CIR asphalt mixture accelerated high-temperature rutting and low-temperature cracking, but it may be acceptable when used for low-volume roads.
Dongzhao Jin; Dongdong Ge; Siyu Chen; Tiankai Che; Hongfu Liu; Lance Malburg; Zhanping You. Cold In-Place Recycling Asphalt Mixtures: Laboratory Performance and Preliminary M-E Design Analysis. Materials 2021, 14, 2036 .
AMA StyleDongzhao Jin, Dongdong Ge, Siyu Chen, Tiankai Che, Hongfu Liu, Lance Malburg, Zhanping You. Cold In-Place Recycling Asphalt Mixtures: Laboratory Performance and Preliminary M-E Design Analysis. Materials. 2021; 14 (8):2036.
Chicago/Turabian StyleDongzhao Jin; Dongdong Ge; Siyu Chen; Tiankai Che; Hongfu Liu; Lance Malburg; Zhanping You. 2021. "Cold In-Place Recycling Asphalt Mixtures: Laboratory Performance and Preliminary M-E Design Analysis." Materials 14, no. 8: 2036.
It is known that the freezing of the road brings high risks to the traffic in winter. However, Traditional deicing technology has low deicing efficiency and severe damage to the road surface. Therefore, the new develop pavement conductive wearing surface with graphite heating film (PCWSG) could be one option to solve this problem. So the main objective of this paper is to investigate the road performance (high-temperature, low-temperature, moisture susceptibility, friction-resistance) of pavement conductive wearing surface with graphite heating film (PCWSG) and then evaluate its deicing potential. In this paper, several tests are conducted to evaluate the performance of PCWSG. The high-temperature performance is conducted by the laboratory wheel-tracking rut test. Low-temperature performance is characterized by the low-temperature bending test. Moisture susceptibility is studied by the freeze-thaw split test. Friction-resistance performance is estimated by the pendulum type friction coefficient measuring instrument and the small acceleration loading device. Furthermore, removing ice potential is studied by asphalt rutting slabs (various gradations) with graphite conductive wearing surface. The results show that pavement conductive wearing surface with graphite heating film (PCWSG) could improve the high-temperature, low-temperature, and friction-resistance compared with the original asphalt mixture. Although moisture susceptibility and wear performance decrease lightly but also satisfy the specification requirement. Moreover, removing ice potential of asphalt slabs with PCWSG results shows that AC-20 asphalt concrete with higher porosity has better deicing and snow removal effect. The PCWSG has lower heating and deicing cost and more effective deicing effects.
Zongyao Yan; Wenjiang Liu; Jie Chen; Dongzhao Jin. Pavement conductive wearing surface with graphite heating film de-icing potential and performance experimental study. International Journal of Pavement Research and Technology 2021, 14, 688 -696.
AMA StyleZongyao Yan, Wenjiang Liu, Jie Chen, Dongzhao Jin. Pavement conductive wearing surface with graphite heating film de-icing potential and performance experimental study. International Journal of Pavement Research and Technology. 2021; 14 (6):688-696.
Chicago/Turabian StyleZongyao Yan; Wenjiang Liu; Jie Chen; Dongzhao Jin. 2021. "Pavement conductive wearing surface with graphite heating film de-icing potential and performance experimental study." International Journal of Pavement Research and Technology 14, no. 6: 688-696.
Emulsified asphalt has been widely used in various surface treatment methods such as chip seal for low-volume road preservation. Using modified emulsified asphalt made it possible to use chip seal technology on medium- and even high-volume traffic pavements. The main objective of the study is to quantify the residue characteristics of rubber-modified emulsified asphalt and to assess the effectiveness of using crumb rubber to modify emulsified asphalt binder. The four emulsified asphalt residues used the distillation procedure. Then, the rheology characteristics of emulsified asphalt residue were evaluated. The Fourier transform infrared spectroscopy (FTIR) test analyzed the chemical change of emulsified asphalt during the aging procedure. The results indicate that the evaporation method cannot remove all the water in emulsified asphalt. The mass change during the rolling thin film oven (RTFO) process only represented the component change of emulsified asphalt binder residue. Both the high-temperature and low-temperature performance grade of the two emulsified asphalt binders with rubber were lower. The original asphalt binder adopted to emulsification had a crucial influence on the performance of emulsified asphalt. The rubber modification enhanced the property of the emulsified asphalt binder at low temperatures, and the improvement effect was enhanced as the rubber content in the emulsified asphalt was raised. The C=O band was more effective in quantifying the aging condition of the residue. The findings of this study may further advance the emulsified asphalt technology in pavement construction and maintenance.
Dongdong Ge; Xiaodong Zhou; Siyu Chen; Dongzhao Jin; Zhanping You. Laboratory Evaluation of the Residue of Rubber-Modified Emulsified Asphalt. Sustainability 2020, 12, 8383 .
AMA StyleDongdong Ge, Xiaodong Zhou, Siyu Chen, Dongzhao Jin, Zhanping You. Laboratory Evaluation of the Residue of Rubber-Modified Emulsified Asphalt. Sustainability. 2020; 12 (20):8383.
Chicago/Turabian StyleDongdong Ge; Xiaodong Zhou; Siyu Chen; Dongzhao Jin; Zhanping You. 2020. "Laboratory Evaluation of the Residue of Rubber-Modified Emulsified Asphalt." Sustainability 12, no. 20: 8383.
Stockpiles of waste tires pose concerns of potential contamination of local groundwater, and fire risk from the large amounts of tires. To sustainably use the waste tires, Ground Tire Rubber (GTR) that produced from waste tires has been used in the pavement industry for decades. The typical GTR content is approximately 1 to 3% by weight of the asphalt mixture. To utilize more waste tires, there is an increasing demanding of using higher amount of GTR in recent years. The objective of this study was to determine the high GTR content that can be used in the asphalt pavement without sacrificing performance. In this study, gap-graded mixtures modified with differing GTR contents were designed. These GTR contents were 2.6%, 3.4%, 3.7%, 4.1% and 4.5% by weight of the mixture. Statistical analysis was conducted to determine the influence of GTR content on the mixture performance. It was found that the fracture energy of the GTR modified mixture was two to three times higher than that of the control mixture. All of the mixtures seemed to provide adequate rutting resistance for low-volume traffic, signifying that after 5000 wheel passes, the rutting depth did not exceed the 12.5-mm. The GTR modified gap-graded mixtures had high resistance to low-temperature cracking and high-temperature rutting. This can partly be attributed to the addition of GTR and the skeleton structure from gap gradation. The result of multiple comparisons suggested that even though the addition of GTR in dense-graded mixtures did not significantly improve the high-temperature performance, the addition of GTR in asphalt mixtures significantly improved the low-temperature performance.
Siyu Chen; Dongdong Ge; Dongzhao Jin; Xiaodong Zhou; Chaochao Liu; Songtao Lv; Zhanping You. Investigation of hot mixture asphalt with high ground tire rubber content. Journal of Cleaner Production 2020, 277, 124037 .
AMA StyleSiyu Chen, Dongdong Ge, Dongzhao Jin, Xiaodong Zhou, Chaochao Liu, Songtao Lv, Zhanping You. Investigation of hot mixture asphalt with high ground tire rubber content. Journal of Cleaner Production. 2020; 277 ():124037.
Chicago/Turabian StyleSiyu Chen; Dongdong Ge; Dongzhao Jin; Xiaodong Zhou; Chaochao Liu; Songtao Lv; Zhanping You. 2020. "Investigation of hot mixture asphalt with high ground tire rubber content." Journal of Cleaner Production 277, no. : 124037.
This study intends to evaluate the feasibility of the use of recycled cathode ray tube (CRT) glass in water-foamed asphalt mixtures used in low volume roads. In the asphalt mixture samples, 21.5% (wt.) aggregates were replaced by the recycled CRT glass to evaluate the mechanical performance and leaching potential. First, the leaching test was used to characterize the leaching potential of the CRT mixes since there is high lead content in CRT glass, which may be harmful to the groundwater if the hazardous lead leaches from the CRT mixes. Second, the high-temperature rutting and the low-temperature cracking performance of the asphalt mixtures were measured via the Hamburg Wheel Tracking Test (HWTT) and the Disk-Shape Compact Tension (DCT) test, respectively. In addition, the Moisture-Induced Stress Tester (MIST) was used to simulate the pore pressure generated in a wet pavement under moving traffic loading. The experimental results showed that, although the measured lead leaching of the pure CRT glass particles was higher than the regulatory level of 5 mg/L, the coated asphalt could effectively insulate the contact between CRT glass and the external environment, resolving the leaching issues. In summary, from the view of the mechanical performance of the water-foamed asphalt mixtures containing recycled CRT glass, the performance is acceptable in various temperatures when used in low volume roads. Recycling CRT glass in asphalt mixture should be carried out with extreme caution because if not done correctly, the potential leaching may eliminate the benefits of recycling unwanted waste materials.
Lingyun You; Dongzhao Jin; Shuaicheng Guo; Jiaqing Wang; Qingli Dai; Zhanping You. Leaching evaluation and performance assessments of asphalt mixtures with recycled cathode ray tube glass: A preliminary study. Journal of Cleaner Production 2020, 279, 123716 .
AMA StyleLingyun You, Dongzhao Jin, Shuaicheng Guo, Jiaqing Wang, Qingli Dai, Zhanping You. Leaching evaluation and performance assessments of asphalt mixtures with recycled cathode ray tube glass: A preliminary study. Journal of Cleaner Production. 2020; 279 ():123716.
Chicago/Turabian StyleLingyun You; Dongzhao Jin; Shuaicheng Guo; Jiaqing Wang; Qingli Dai; Zhanping You. 2020. "Leaching evaluation and performance assessments of asphalt mixtures with recycled cathode ray tube glass: A preliminary study." Journal of Cleaner Production 279, no. : 123716.