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In order to accelerate the heat flow in asphalt pavement, two types of steel fiber, curved hook steel fiber and long sawtooth steel fiber, were used to prepare steel fiber asphalt mixture (SFAM). The results show that all the SFAM specimens presented higher air voids contents at the two ends, compared with control asphalt mixture. From the results of dynamic modulus and creep test it is found that the deformation resistance of SFAMs gradually reduced with the increase of steel fiber content, which could be explained by the air voids distribution characteristics of SFAM specimens. On the contrary, SFAM showed excellent low-temperature cracking resistance and fatigue performance. Combining the above results, it is recommended to use 1.0% curved hook steel fiber to reinforce asphalt mixture for improving the thermal conductivity and road performances of asphalt mixture. Because of the reduced deformation resistance of SFAM, the cooling performance of SFAM asphalt pavement needs to be investigated in future studies, based on which the rutting depth can be simulated by means of finite element analysis to determine the actual influence of steel fiber on the rutting resistance of asphalt pavement.
Yinfei Du; Jiacheng Wang; Haibin Deng; Yingchen Liu; Jun Tian; Xiaowei Wu. Using steel fibers to accelerate the heat conduction in asphalt mixture and its performance evaluation. Construction and Building Materials 2021, 282, 122637 .
AMA StyleYinfei Du, Jiacheng Wang, Haibin Deng, Yingchen Liu, Jun Tian, Xiaowei Wu. Using steel fibers to accelerate the heat conduction in asphalt mixture and its performance evaluation. Construction and Building Materials. 2021; 282 ():122637.
Chicago/Turabian StyleYinfei Du; Jiacheng Wang; Haibin Deng; Yingchen Liu; Jun Tian; Xiaowei Wu. 2021. "Using steel fibers to accelerate the heat conduction in asphalt mixture and its performance evaluation." Construction and Building Materials 282, no. : 122637.
The work aims at investigating on interface fracture properties and nonlinear fracture model between ECC and concrete under salt freeze-thaw cycles. Based on the interface nonlinear fracture mechanism, a three-parameter nonlinear fracture model was proposed to comprehensive and accurately reflect the degradation law of interface fracture properties under salt freeze-thaw cycles. The experimental results showed that the salt freeze-thaw erosion had a very negative effect on interface fracture properties. Moreover, the occurrence of interface fracture under salt freeze-thaw cycles was affected remarkably by ECC strength grade, and the higher ECC strength always leads to later occurrences of interface fracture. Regardless of cycles, the fracture propagation process of all specimens included three phases: initial crack, stable crack propagation, and instability failure. Moreover, the three phases all occurred at the interface, and the crack did not extend to ECC or concrete substrate. Meanwhile, the fibers bridging effect was very significant at the phases of crack stable propagation and instability failure. Only one kind of wedge-splitting load-crack mouth opening displacement (CMOD) curve was observed. As number of cycles increased, slope of rising section curve and ultimate wedge-splitting loads all gradually decreased, while the CMOD corresponding to ultimate splitting load had little change. The salt freeze-thaw erosion had a very negative effect on three fracture parameters. Moreover, the three fracture parameters all decreased continuously with the increasing number of cycles.
Xiaowei Wu; Jun Tian; Hongwei Ma; Yu Zheng; ShaoWei Hu; Wenwei Wang; Yinfei Du; Wentong Huang; Can Sun; Zhongfeng Zhu. Investigation on interface fracture properties and nonlinear fracture model between ECC and concrete subjected to salt freeze-thaw cycles. Construction and Building Materials 2020, 259, 119785 .
AMA StyleXiaowei Wu, Jun Tian, Hongwei Ma, Yu Zheng, ShaoWei Hu, Wenwei Wang, Yinfei Du, Wentong Huang, Can Sun, Zhongfeng Zhu. Investigation on interface fracture properties and nonlinear fracture model between ECC and concrete subjected to salt freeze-thaw cycles. Construction and Building Materials. 2020; 259 ():119785.
Chicago/Turabian StyleXiaowei Wu; Jun Tian; Hongwei Ma; Yu Zheng; ShaoWei Hu; Wenwei Wang; Yinfei Du; Wentong Huang; Can Sun; Zhongfeng Zhu. 2020. "Investigation on interface fracture properties and nonlinear fracture model between ECC and concrete subjected to salt freeze-thaw cycles." Construction and Building Materials 259, no. : 119785.
The skeleton-stabilized gradation based on discrete element model was used to design a warm mix rich asphalt concrete, and its fatigue and fracture performance were studied. The main findings of this study include that: (1) adding warm mix additive could effectively reduce the viscosity of rubberized asphalt and improve the mixing of rubberized asphalt mixture; (2) the splitting strength and the fatigue life of warm mix rubberized asphalt concrete were better than warm mix raw asphalt concrete; (3) critical stress intensity factor was a suitable index to evaluate anti-crack performance of warm mix rich asphalt concrete.
Wentong Huang; Peiyong He; Xiang Long; Jun Tian; Yu Zheng; Hongwei Ma; ShaoWei Hu; Xiaowei Wu. Design of a skeleton-stabilized warm mix asphalt mixture and investigation of its fatigue and fracture performance. Construction and Building Materials 2020, 248, 118618 .
AMA StyleWentong Huang, Peiyong He, Xiang Long, Jun Tian, Yu Zheng, Hongwei Ma, ShaoWei Hu, Xiaowei Wu. Design of a skeleton-stabilized warm mix asphalt mixture and investigation of its fatigue and fracture performance. Construction and Building Materials. 2020; 248 ():118618.
Chicago/Turabian StyleWentong Huang; Peiyong He; Xiang Long; Jun Tian; Yu Zheng; Hongwei Ma; ShaoWei Hu; Xiaowei Wu. 2020. "Design of a skeleton-stabilized warm mix asphalt mixture and investigation of its fatigue and fracture performance." Construction and Building Materials 248, no. : 118618.
Polyethylene glycol (PEG) has been used as a phase change material in asphalt mixture to cool asphalt pavement in summer. However, the PEG is much likely to leak and then influence its performance. This study aimed at studying the interaction between PEG and asphalt for phase change effect. Laboratory tests were conducted to evaluate the influence of PCM on asphalt/asphalt mixture performance, including microscopic test, dynamic shear rheometer test, indoor irradiation test and shear strength test. The results showed that the measured phase change enthalpy of PEG/asphalt composite was lower than theoretical results. Based on the observed FTIR spectra and fluorescence images, the PEG was found evenly distributed in the asphalt at a low content. The results of frequency and temperature sweep tests indicated that the liquid state of PEG could improve the elastic property of PAC. Furthermore, the zero shear viscosity at 40–60 °C and the non-recoverable compliance at 3.2 kPa and 12.8 kPa both increased due to the addition of PEG. The peak temperature of the PEG/asphalt mixture with 20% PEG was 3.3 °C lower than control asphalt mixture. However, the shear strength of PEG/asphalt mixture decreased by 20.3%, compared with control asphalt mixture. The study findings indicate that it is desired to propose an effective method to incorporate phase change material in asphalt mixture in order to reduce the influences of PCM leakage on performance.
Yinfei Du; Pusheng Liu; Jiacheng Wang; Hao Wang; ShaoWei Hu; Jun Tian; Yingtao Li. Laboratory investigation of phase change effect of polyethylene glycolon on asphalt binder and mixture performance. Construction and Building Materials 2019, 212, 1 -9.
AMA StyleYinfei Du, Pusheng Liu, Jiacheng Wang, Hao Wang, ShaoWei Hu, Jun Tian, Yingtao Li. Laboratory investigation of phase change effect of polyethylene glycolon on asphalt binder and mixture performance. Construction and Building Materials. 2019; 212 ():1-9.
Chicago/Turabian StyleYinfei Du; Pusheng Liu; Jiacheng Wang; Hao Wang; ShaoWei Hu; Jun Tian; Yingtao Li. 2019. "Laboratory investigation of phase change effect of polyethylene glycolon on asphalt binder and mixture performance." Construction and Building Materials 212, no. : 1-9.
Previous studies have showed that rock asphalt (RA) or diatomite were used to modify the petroleum bitumen. This paper presents the findings from a study conducted to evaluate the potential impact of RA and diatomite on the rheological characteristics of bitumen composites. RA and diatomite with three different dosages were added into the petroleum bitumen: 18% RA, 13% RA+7% diatomite, and 16% RA+9% diatomite by weight. The rheological characteristics of the RA and diatomite modified bitumens were evaluated in this study. The tests conducted included temperature sweep and frequency sweep tests with a dynamic shear rheometer (DSR), a Brookfield rotation viscosity test, and a scanning electron microscope test. The research showed that the addition of RA and diatomite to petroleum bitumen considerably increased the apparent viscosity, dynamic shear modulus, and rutting resistance in bitumen specimens. However, the DSR test indicated a slight reduction in the fatigue performance of composites made of RA and diatomite modified bitumens. Overall, RA and diatomite are good modifiers for petroleum bitumen for a performance improvement.
Wentong Huang; Duanyi Wang; Peiyong He; Xiang Long; Bing Tong; Jun Tian; Peng Yu. Rheological Characteristics Evaluation of Bitumen Composites Containing Rock Asphalt and Diatomite. Applied Sciences 2019, 9, 1023 .
AMA StyleWentong Huang, Duanyi Wang, Peiyong He, Xiang Long, Bing Tong, Jun Tian, Peng Yu. Rheological Characteristics Evaluation of Bitumen Composites Containing Rock Asphalt and Diatomite. Applied Sciences. 2019; 9 (5):1023.
Chicago/Turabian StyleWentong Huang; Duanyi Wang; Peiyong He; Xiang Long; Bing Tong; Jun Tian; Peng Yu. 2019. "Rheological Characteristics Evaluation of Bitumen Composites Containing Rock Asphalt and Diatomite." Applied Sciences 9, no. 5: 1023.
Cement-treated aggregate mixture (CTAM) is widely used in many countries. To design this mixture using the vibration compaction method brings about many problems, such as serious inconsistencies in key parameters and strong vibration energy and noise imposed on adjacent buildings and people. This work presents a preliminary investigation of the use of Superpave gyratory compactor, which has been widely used to compact hot mix asphalt in the laboratory, to design CTAM. The 3-2-2 mode of the locking point was used to determine that the gyration compaction number Ndesign should be 105. The performances of the CTAM specimens prepared using gyration compaction were compared with those prepared using the Proctor and vibration compaction methods. Compared with Proctor and vibration compaction, gyration compaction had a smaller influence on aggregate degradation. Also, the optimal moisture content after gyration compaction was the minimum. The index values for maximum dry density, unconfined compressive strength and dry/temperature shrinkage coefficient after gyration compaction were between those for Proctor compaction and vibration compaction. It can be concluded that it is feasible to design CTAM by using a Superpave gyratory compactor to compact the mixture for 105 cycles.
Yinfei Du; Pusheng Liu; Jun Tian; Jian Zhang; Yu Zheng. Preliminary Investigation of the Feasibility of Using a Superpave Gyratory Compactor to Design Cement-Treated Aggregate Mixture. Applied Sciences 2018, 8, 946 .
AMA StyleYinfei Du, Pusheng Liu, Jun Tian, Jian Zhang, Yu Zheng. Preliminary Investigation of the Feasibility of Using a Superpave Gyratory Compactor to Design Cement-Treated Aggregate Mixture. Applied Sciences. 2018; 8 (6):946.
Chicago/Turabian StyleYinfei Du; Pusheng Liu; Jun Tian; Jian Zhang; Yu Zheng. 2018. "Preliminary Investigation of the Feasibility of Using a Superpave Gyratory Compactor to Design Cement-Treated Aggregate Mixture." Applied Sciences 8, no. 6: 946.