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学者姓名：戴逸清
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Abstract ：
This study explores the performance of asphalt mixtures modified with North American rock asphalt and desulfurized rubber particles at varying rubber-to-asphalt ratios ranging from 18% to 36% by weight. A comprehensive set of laboratory tests, including high-temperature rutting tests, low-temperature bending tests, indirect tensile tests, and freeze–thaw splitting tests, were conducted to evaluate the modified mixtures. The results indicate that both wet and dry blending methods produce mixtures that meet technical requirements, with the optimal asphalt-to-aggregate ratio determined to be 7.1%. At a rubber-to-asphalt ratio of 18%, the wet blending method slightly improves high-temperature rutting resistance compared to the dry method. However, an increase in rubber content generally enhances rutting resistance regardless of the blending technique. The wet blending method excels in low-temperature crack resistance, possibly due to better rubber dispersion, while an increase in rubber content diminishes crack resistance due to a thinning asphalt film. In terms of fatigue performance, the dry blending method results in significantly longer fatigue life, with a 27% rubber-to-asphalt ratio exhibiting optimal balance. The dry method consistently outperforms the wet method in water stability, and the resistance to water damage increases with rubber content. In conclusion, this study provides valuable insights into optimizing rubber-to-asphalt ratios and blending methods for various application needs, showcasing the benefits of rock asphalt and desulfurized rubber particles in asphalt modification. © 2024 by the authors.
Keyword ：
Asphalt mixtures Asphalt mixtures Bending tests Bending tests Cracks Cracks Fracture mechanics Fracture mechanics Low temperature testing Low temperature testing Rubber films Rubber films Tensile testing Tensile testing Thermal fatigue Thermal fatigue
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| GB/T 7714 | Xie, Shengjia , Cheng, Zhiqiang , Zhou, Yue et al. Performance of Asphalt Mixtures Modified with Desulfurized Rubber and Rock Asphalt Composites [J]. | Buildings , 2024 , 14 (9) . |
| MLA | Xie, Shengjia et al. "Performance of Asphalt Mixtures Modified with Desulfurized Rubber and Rock Asphalt Composites" . | Buildings 14 . 9 (2024) . |
| APA | Xie, Shengjia , Cheng, Zhiqiang , Zhou, Yue , Cao, Yadong , Wang, Tao , Zhang, Zhiqiang et al. Performance of Asphalt Mixtures Modified with Desulfurized Rubber and Rock Asphalt Composites . | Buildings , 2024 , 14 (9) . |
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Coal-bearing soil slopes are associated with a high risk of landslides when subjected to high soil water content. Steel bars have been used as soil nailing for slope stabilization; however, corrosion may occur in an aggressive environment. Glass fiber reinforced polymer (GFRP) and basalt fiber reinforced polymer (BFRP) bars have higher resistance to corrosion and could be alternatives to steel bars, but their elastic modulus and bonding strength with cement concrete are inferior to steel bars, which may result in lower reinforcement effects against landslides and hence require further investigation. In this study, the mechanical properties of different types of bars were investigated using tensile tests. The mineral composition of the soil samples was analyzed. Subsequently, pull-out tests were conducted on three types of bars (steel, GFRP, and BFRP) embedded in grouts in the soil. Up to 38 test scenarios were investigated, and the results were statistically analyzed using an analysis of variance test. The effects of several factors were studied, including the bar type, water content, soil compaction degree, and soil surcharge. The results showed that the bar type had an insignificant effect on the maximum pull-out loads, indicating the feasibility of using GFRP and BFRP bars as alternatives to steel bars for soil nailing in coal-bearing soil slopes. The reinforcement effect can be weakened by rainfall or drought events and enhanced by higher compaction energy and surcharge loads.
Keyword ：
coal-bearing soil slopes coal-bearing soil slopes fiber reinforced fiber reinforced highway and expressway engineering highway and expressway engineering polymer polymer pull-out tests pull-out tests soil nailing soil nailing
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| GB/T 7714 | Que, Yun , Dai, Yiqing , Hong, Qifeng et al. Pull-Out Tests for GFRP/BFRP/Steel Bars Used as Nailing for Coal-Bearing Soil Slopes in Humid Regions [J]. | JOURNAL OF TESTING AND EVALUATION , 2023 , 52 (1) : 491-510 . |
| MLA | Que, Yun et al. "Pull-Out Tests for GFRP/BFRP/Steel Bars Used as Nailing for Coal-Bearing Soil Slopes in Humid Regions" . | JOURNAL OF TESTING AND EVALUATION 52 . 1 (2023) : 491-510 . |
| APA | Que, Yun , Dai, Yiqing , Hong, Qifeng , Fang, Lei , Zhang, Canlin . Pull-Out Tests for GFRP/BFRP/Steel Bars Used as Nailing for Coal-Bearing Soil Slopes in Humid Regions . | JOURNAL OF TESTING AND EVALUATION , 2023 , 52 (1) , 491-510 . |
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Nanosilica (NS) may be obtained as a by-product in several industrial processes and is associated with high availability and affordability among other nanoadditives. NS has been used for asphalt modification, and improvement in high-temperature performance and several other physical properties has been reported. However, due to the wide varieties and intrinsic variability of asphalt materials, concerns have been raised about the reproducibility of some conclusions, and therefore, a review was conducted. According to the results, NS additives with a purity of over 99% were usually used for modification and the specific surface area was over 100 m(2)/g, leading to the superior absorption of asphalt and thus improvement in rutting resistance of the mixtures. Due to a lack of guidance for the blending procedures, inconsistency exists among studies in the shear speed, blending duration, and temperature, leading to possible excessive blending and unnecessary energy and time consumption. Rises in NS concentration would cause higher softening point and rotational viscosity, and therefore elevated temperatures for mixing and paving, but penetration would be reduced. According to rheological evaluations, with the rise of NS concentration, the rutting parameter would increase, indicating an improvement in the high-temperature performance, but the low-temperature performance may deteriorate.
Keyword ：
asphalt binders asphalt binders dynamic shear rheometer test dynamic shear rheometer test modification modification nanosilica nanosilica rheological property rheological property
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| GB/T 7714 | Dai, Yiqing , Liang, Wei , Ye, Danwang et al. Modification effects of nanosilica on asphalt binders: A review [J]. | NANOTECHNOLOGY REVIEWS , 2023 , 12 (1) . |
| MLA | Dai, Yiqing et al. "Modification effects of nanosilica on asphalt binders: A review" . | NANOTECHNOLOGY REVIEWS 12 . 1 (2023) . |
| APA | Dai, Yiqing , Liang, Wei , Ye, Danwang , Xie, Shengjia , Sang, Yuan , Li, Dong . Modification effects of nanosilica on asphalt binders: A review . | NANOTECHNOLOGY REVIEWS , 2023 , 12 (1) . |
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Applications of photovoltaic (PV) cells in buildings are often excluded from locations with major mechanical strains because of their brittleness and possible damages at small mechanical strains. Combinations of glass fibre reinforced polymer (GFRP) components and amorphous silicon (a-Si) photovoltaic cells show potentials, while the effects from elevated temperatures and mechanical loads on the electrical performance of the integrated PV cells need to be well understood. In this study, specimens were fabricated by adhesively bonding a-Si PV cells to GFRP sandwich structures. The specimens were then exposed to outdoor natural sunlight. The sunlight intensities and the temperature responses at different locations of the specimens were continuously monitored and their correlation was quantified. An approach was proposed to calculate the sunlight intensities received by the integrated PV cells and their temperature responses based on geographic information (e.g. longitude, latitude and altitude) of such applications. The electrical performance of the integrated PV cells was then investigated under four-point bending until structural failure. Two loading scenarios were considered where non-uniformly distributed tensile or compressive strains were introduced into the integrated PV cells. Reductions in voltage of the integrated PV cells were highlighted due to non-uniform distribution of strains.
Keyword ：
Amorphous silicon photovoltaic cells Amorphous silicon photovoltaic cells Building-integrated photovoltaics Building-integrated photovoltaics Glass fibre reinforced polymer Glass fibre reinforced polymer Mechanical performance Mechanical performance Sandwich structure Sandwich structure Thermal performance Thermal performance
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| GB/T 7714 | Dai, Yiqing , Bai, Yu , Keller, Thomas . Thermal and mechanical performances of GFRP sandwich structures with integrated amorphous silicon photovoltaic cells [J]. | COMPOSITE STRUCTURES , 2022 , 290 . |
| MLA | Dai, Yiqing et al. "Thermal and mechanical performances of GFRP sandwich structures with integrated amorphous silicon photovoltaic cells" . | COMPOSITE STRUCTURES 290 (2022) . |
| APA | Dai, Yiqing , Bai, Yu , Keller, Thomas . Thermal and mechanical performances of GFRP sandwich structures with integrated amorphous silicon photovoltaic cells . | COMPOSITE STRUCTURES , 2022 , 290 . |
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The unsaturated seepage field coupled with heavy rainfall-induced surface flow mainly accounts for the slope instability. If the slope contains macropores, the coupled model and solution process significantly differ from the traditional one (without macropores). Most of the studies on the variation of the water field under the coupled effect of runoff and seepage on the slope did not consider the macropore structure. In this paper, two coupled Richards equations were used to describe the MF (Macropore Flow), and along with the kinematic wave equation, they were applied to establish a coupled model of SR (Slope Runoff) and MF. The numerical solving of the coupled model was realized by the COMSOL PDE finite element method, and an innovative laboratory test was conducted to verify the numerical results. The effects of different factors (i.e., rainfall intensity, rainfall duration, saturated conductivity, and slope roughness coefficient) on water content and ponding depth with and without macropores were compared and analyzed. The results show that infiltration is more likely to happen in MF than UF (Unsaturated Flow, without macropore). The depths of the saturation zone and the wetting front of MF are obviously greater than those of UF. When SR occurs, rainfall duration has the most significant influence on infiltration. When macropores are considered, the ponding depth is smaller at the beginning of rainfall, while the effects are not obvious in the later period. Rain intensity and roughness coefficient have significant influences on the ponding depth. Therefore, macropores should not be ignored in the analysis of the slope seepage field.
Keyword ：
finite element method finite element method heavy rainfall heavy rainfall Macropore Flow Macropore Flow ponding depth ponding depth Slope Runoff Slope Runoff
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| GB/T 7714 | Li, Shanghui , Jiang, Zhenliang , Que, Yun et al. Water Field Distribution Characteristics under Slope Runoff and Seepage Coupled Effect Based on the Finite Element Method [J]. | WATER , 2021 , 13 (24) . |
| MLA | Li, Shanghui et al. "Water Field Distribution Characteristics under Slope Runoff and Seepage Coupled Effect Based on the Finite Element Method" . | WATER 13 . 24 (2021) . |
| APA | Li, Shanghui , Jiang, Zhenliang , Que, Yun , Chen, Xian , Ding, Hui , Liu, Yi et al. Water Field Distribution Characteristics under Slope Runoff and Seepage Coupled Effect Based on the Finite Element Method . | WATER , 2021 , 13 (24) . |
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Photovoltaic (PV) facilities are sustainable and promising approaches for energy harvesting, but their applications usually require adequate spaces. Road structures account for a considerable proportion of urban and suburban areas and may be feasible for incorporation with photovoltaic facilities, and thereby have attracted research interests. One solution for such applications is to take advantage of the spare ground in road facilities without traffic load, where the solar panels are mounted as their conventional applications. Such practices have been applied in medians and slopes of roads and open spaces in interchanges. Applications in accessory buildings and facilities including noise/wind barriers, parking lots, and lightings have also been reported. More efforts in existing researches have been paid to PV applications in load-bearing pavement structures, possibly because the pavement structures cover the major area of road structures. Current strategies are encapsulating PV cells by transparent coverings to different substrates to prefabricate modular PV panels in factories for onsite installation. Test road sections with such modular solar panels have been reported, where inferior cost-effectiveness and difficulties in maintenance have been evidenced, suggesting more challenges exist than expected. In order to enhance the power output of the integrated PV facilities, experiences from building-integrated PVs may be helpful, including a selection of proper PV technologies, an optimized inclination of PV panels, and mitigating the operational temperature of PV cells. Novel integrations of amorphous silicon PV cells and glass fiber reinforced polymer profiles are proposed in this research for multi-scenario applications, and their mechanical robustness was evaluated by bending experiments.
Keyword ：
energy harvesting energy harvesting experimental investigation experimental investigation highway highway photovoltaics photovoltaics solar panel solar panel urban street urban street
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| GB/T 7714 | Dai, Yiqing , Yin, Yan , Lu, Yundi . Strategies to Facilitate Photovoltaic Applications in Road Structures for Energy Harvesting [J]. | ENERGIES , 2021 , 14 (21) . |
| MLA | Dai, Yiqing et al. "Strategies to Facilitate Photovoltaic Applications in Road Structures for Energy Harvesting" . | ENERGIES 14 . 21 (2021) . |
| APA | Dai, Yiqing , Yin, Yan , Lu, Yundi . Strategies to Facilitate Photovoltaic Applications in Road Structures for Energy Harvesting . | ENERGIES , 2021 , 14 (21) . |
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