摘要：
The comprehensive properties evaluation index of asphalt mixture has the characteristics of multilevel and multifactor. The weight of each road performance index is the key factor to assess the comprehensive properties of the asphalt mixture. However, how to determine the weight objectively is a very key problem in the performance evaluation model. In this study, the comparison matrix method was used to determine the performance weight objectively of rock asphalt modified bio-asphalt mixture (RABAM). First, the neat asphalt mixture (NAM), bio-asphalt mixture (BAM), rock asphalt modified asphalt mixture (RAM), and RABAM were prepared. Second, the high-temperature and low-temperature properties, water damage resistance, and fatigue characteristics of the different asphalt mixtures was analyzed. Finally, the comprehensive properties were evaluated under different climate zones in China. The results indicated that the rock asphalt improves the comprehensive performance of BAM. Applying the comparison matrix method to the field of road materials can effectively evaluate the applicability of road materials in different regions.
关键词：
Information technology (IT) innovations;Knowledge sharing (KS);Team creativity;Construction project
摘要：
Knowledge sharing (KS) and team creativity are crucial to achieving complex goals in a construction project. However, in the information age, there is a lack of research on exploring the influencing mechanisms among two dimensions of information technology (IT) innovations (i.e., intra- and interorganizational IT innovations) and two types of KS (i.e., tacit and explicit KS), along with team creativity in construction projects. Therefore, this paper builds a theoretical model of the relationships among the aforementioned variables. To validate the feasibility of this model, 289 valid questionnaires from the construction industry in China are analyzed. Results indicate that the influence of interorganizational IT innovation on team creativity is significant, and the influence is partially mediated by tacit and explicit KS. The influence of intraorganizational IT innovation on team creativity is significant, and the influence is partially mediated by explicit KS but not tacit KS. This study addresses the controversial issue of whether or how IT can promote tacit KS. This study also provides fresh insights into the influencing mechanisms of team creativity in construction projects owing to changes in the KS level affected by organizational IT innovations. There are also important practical implications relating to how project managers may rationally use IT to enhance KS and team creativity.
摘要：
To address issues related to the limited improvement in the performance of phase-change material (PCMs) modified asphalt and the unclear underlying mechanisms, this study developed two structurally stable and thermally efficient coal gangue composite phase-change agents. The impact on enhancing the properties of asphalt was systematically investigated. The study revealed that when the dosage of the phase-change agent is below 20%, there was a pronounced interactive effect between the agent and asphalt. This interaction had the capability to regulate both the non-polar and polar components within the asphalt colloid system. By controlling the dosage of the PCMs agent, it was possible to enhance the high-temperature rheological properties, high-temperature shear resistance and low-temperature flexibility of the asphalt. Additionally, this control improved the adhesion and moisture sensitivity of the PCMs modified asphalt and aggregate system. The maximum temperature-regulating effect of PCMs modified asphalt could reach up to 8.3 degrees C, with the functional attribute strongly correlated with the low-temperature performance of the asphalt. This research contributes to the promotion and application of PCMs in road engineering.
通讯机构：
[Jian Xiang; Zhaolei Zhang] K;Key Laboratory of Highway Engineering of Ministry of Education, Changsha University of Science and Technology, Changsha, China
摘要：
The emergence of connected autonomous vehicles (CAVs) has the potential to dramatically increase road capacity, and the provision of dedicated lanes for CAVs is a common management strategy to ensure that CAVs take appropriate priority over other vehicles. However, existing models of CAV lane management do not perform well at low CAV market penetration rates. Therefore, a novel model is proposed to address this shortcoming in this paper, and qualified human-driven vehicles (HDVs) are allowed to enter the CAV priority lane when there is a low CAV penetration rate. A theoretical model is proposed to examine the impacts of three managed lane strategies under mixed traffic and then compare three lane management strategies under different CAV penetration rates and traffic demands. The results show that these lane management strategies can improve throughput, reduce travel time, increase speed, and reduce the variance of the distribution of vehicle speeds under different penetration rates and traffic demands.
摘要：
Carbon Neutrality goals and Sustainable Development Goals (SDGs), as new requirements for global development at this stage, have raised higher requirements for achieving the coordination of economic efficiency and ecological development of transportation infrastructure, especially highways. To promote the achievement of Carbon neutrality goals and SDGs, this research intends to study the effect of highways on the efficiency of carbon unlocking in each province. In this paper, we take China as an example, use the data of 18 listed highway companies and their provinces from 2010–2021 to conduct the study, measure the static carbon unlocking efficiency by using the super-efficiency SBM model with undesirable outputs, combine with the Malmquist index model for the decomposition of the efficiency and the dynamic analysis, and use the Tobit regression model to analyze the factors affecting the carbon unlocking efficiency. The results show that (1) From a static perspective, the carbon unlocking efficiency shows a steady upward trend, and the carbon unlocking efficiency has been in a state of low efficiency in general, with obvious regional differences. (2) From a dynamic perspective, carbon unlocking efficiency changes are relatively flat, and the carbon unlocking efficiency change index is in the rising stage, relying on technical efficiency can effectively improve the level of carbon unlocking efficiency. (3) The regional economic level, industrial structure, and urbanization level have a significant positive correlation with carbon unlocking efficiency, while the level of scientific and technological development and the level of opening up have a negative effect.
关键词：
failure definition;failure criterion;bitumen fatigue cracking performance;bitumen fatigue failure point
摘要：
A full understanding of bitumen fatigue cracking behavior is extremely important as this phenomenon has a considerable influence on bituminous pavement performance. The current framework for assessing this asphalt binder property is inconsistent in ranking bitumen fatigue performance in terms of the failure definition and damage characteristic curve (DCC) analysis. This study used four different types of asphalt binders: neat asphalt (NA), self-healing thermoplastic polyurethane (STP)-modified bitumen, self-healing poly (dimethyl siloxane) crosslinked with urea bond (IPA1w)-modified bitumen, and styrene-butadiene-styrene (SBS)-modified bitumen (SBSB). All the bitumens were subjected to short-term and long-term aging, and they were also tested by utilizing the linear amplitude sweep (LAS) test and the simplified viscoelastic continuum damage (S-VECD) model. LAS and S-VECD procedures were used to apply the newly proposed and current frameworks in order to analyze bitumen performance. The current framework showed that the bitumens that used a higher number of loading cycles (N) to reach their failure points (Nf) failed to exhibit greater fatigue performances in terms of DCC analysis. The developed framework (mainly based on the damage intensity [S] instead of N) was used to solve the inconsistency between the failure definition and DCC assessment in ranking bitumen performance. Additionally, the current framework (failure criterion) presented two R2 values below 0.1, but the developed framework (failure criterion) showed that all R2 values were greater than 0.9. The developed framework represents a turning point because, for the first time, this type of procedure is mainly being based on S instead of N. Although further tests are needed to confirm its efficiency, it eliminates the inconsistency between the failure definition and DCC assessment.
通讯机构：
[Hu, C ] C;Changsha Univ Sci & Technol, Sch Traff & Transportat Engn, Key Lab Rd Struct & Mat Transportat Minist, 960,Sect 2,Wanjiali South Rd, Changsha 410114, Hunan, Peoples R China.
关键词：
sisal fiber;different length;cement emulsified asphalt mixture;mechanism of action
摘要：
In order to explore the suitable length of sisal fibers used in cement emulsified asphalt mixtures, this paper refers to the AC-20 gradation of hot mix asphalt mixture, and adds 3 mm, 6 mm, 9 mm, 12 mm, 15 mm, and 18 mm sisal fibers to cement emulsified asphalt mixture. The effects of different sisal fiber lengths on the performance of cement emulsified asphalt mixture were investigated by low temperature splitting tests, high temperature stability tests, and water stability tests. The influence of different fiber lengths on the performance of cement emulsified asphalt mixture was investigated by grey correlation theory. The results show that there is a correlation between the length of the sisal fiber and the performance of the cement emulsified asphalt mixture. The length of sisal fiber has the greatest influence on the splitting tensile strength of cement emulsified asphalt mixture, followed by dynamic stability, freeze thaw splitting strength ratio, immersion Marshall residual stability, vacuum saturation residual stability, and permeability coefficient. The enhancement mechanism of sisal fiber on cement emulsified asphalt mixture was explored by means of infrared spectroscopy and electron microscope scanning. The results show that after adding sisal fiber to cement emulsified asphalt mixture, the overall stability of cement emulsified asphalt mixture is increased under the action of "pulling anchor" of sisal fiber. According to the research results of this paper, it is suggested that sisal fiber with a length of 9 mm is added to cement emulsified asphalt mixture under AC-20 gradation.
摘要：
To study asphalt aging and its anti-aging mechanism, the Frontier Orbital theory, Fukui Function, and Density Functional Theory are applied.The data reveals that 65 nm UV light can dissociate O2 into O radicals during UV aging. Among the resin components, sulfur (S) exhibits the highest radical attack index (f0) of 0.131. Resin molecules absorb UV light at 344 nm and 311 nm, leading to pi electron transitions in S with a 28% probability. This result aligns with f0, indicating that f0 adequately reflects chemical reactivity. Resin molecules with electron transitions in S can form sulfoxide by creating a new delocalized pi bond with unpaired electrons from oxygen radicals. Thermal oxidative aging at a temperature of 241 K has the potential to form carbonyl, hydroxyl, and peroxide bridge bonds. Ageing-resistant agents with a high f0 value on their outer layer compete with resin molecules in radical reactions, thereby exhibiting anti-aging effects. Calculation results indicate a slight increase in the number of carbonyl and peroxide bridge bonds after short-term aging, which becomes more prominent under pressure aging. UV aging is expected to result in a significant increase in sulfoxide, carbonyl, and ether bonds. The combination of experimental and calculated findings suggests that using quantum chemistry for qualitative analysis of aging mechanisms is a feasible approach. This method aids the investigation of asphalt anti-aging measures and enhances the efficiency of optimizing asphalt anti-aging agents.
关键词：
life cycle assessment (LCA);ecological slope treatment;carbon emission;environmental management;sustainable development
摘要：
Life cycle assessment (LCA) plays an increasingly important role in environmental management, particularly in promoting energy and carbon-conscious practices across various disciplines. This review provides an overview of the latest innovations and potential benefits of integrating LCA into ecological slope treatment strategies. This study explores new developments in LCA methodology and its application to slope treatment, aiming to improve the integration of infrastructure development and environmental stewardship. Through an extensive review of over 120 peer-reviewed journal articles and a critical analysis of the intersection of LCA with slope treatment, this paper identifies innovative techniques that have the potential to significantly reduce the environmental impact of slope management. The review emphasizes advanced LCA practices that quantify and mitigate carbon emissions throughout the life cycle stages of slope treatments. Key findings demonstrate that LCA enhances the methodological rigor in assessing ecosystem services and impacts, and reveals new strategies that emphasize the importance of ecological considerations in infrastructure projects. Future research directions focus on refining LCA data acquisition and promoting a standardized knowledge base to support precision in ecological impact assessments. In conclusion, the adoption of LCA in slope treatment is imperative for aligning industry practices with global sustainability targets, emphasizing the importance of integrating uncertainty analysis and long-term impact assessments to bolster the credibility of LCA outcomes.
摘要：
Offshore monopiles subjected to waves and wind-induced cyclic lateral loading have been frequently located in complex terrains, such as sloping ground, thus demonstrating quite complicated response characteristics. To this end, this study experimentally investigated the pile responses in the sloping ground under cyclic lateral loading, focusing on the effects of slope and loading characteristics (i.e., loading direction and loading pattern). The measured responses indicated that the slope effect should be particularly considered under downslope loading because it would further amplify the cyclic response of piles. This amplification is related to the slope angle and rarely depends on the loading pattern. In addition, the relative magnitude of ultimate lateral capacity Pu with the maximum cyclic load may determine the elastic and plastic shakedown of piles in sloping ground. The maximum accumulated displacement is sensitive to the cyclic loading ratio (CLR) instead of the static load ratio (SLR), while the bending moment is reversed. The secant stiffness increases with the number of cycles and is greater in the upslope loading case, while it is reversed for the hysteresis loop area. Both secant stiffness and the hysteresis loop area, however, are sensitive to CLR rather than SLR, and closely related.
摘要：
To promote the resource utilization of steel slag and improve the production process of steel slag in steelmaking plants, this research studied the characteristics of three different processed steel slags from four steelmaking plants. The physical and mechanical characteristics and volume stability of steel slags were analyzed through density, water absorption, and expansion tests. The main mineral phases, morphological characteristics, and thermal stability of the original steel slag and the steel slag after the expansion test are analyzed with X-ray diffractometer (XRD), scanning electron microscope (SEM), and thermogravimetric analysis (TG) tests. The results show that the composition of steel slag produced by different processes is similar. The main active substances of other processed steel slags are dicalcium silicate (C2S), tricalcium silicate (C3S), CaO, and MgO. After the expansion test, the main chemical products of steel slag are CaCO3, MgCO3, and calcium silicate hydrate (C-S-H). Noticeable mineral crystals appeared on the surface of the steel slag after the expansion test, presenting tetrahedral or cigar-like protrusions. The drum slag had the highest density and water stability. The drum slag had the lowest porosity and the densest microstructure surface, compared with steel slags that other methods produce. The thermal stability of steel slag treated by the hot splashing method was relatively higher than that of steel slag treated by the other two methods.
摘要：
Good anti-skid performance was the basis for road safety, and it was discovered that the texture abrasion of pavement in service can directly affect its anti-skid performance. To analyze the influence mechanism of abrasion on the surface texture and anti-skid performance of asphalt pavement, this research collected high-precision texture data of different types of asphalt pavements with different degrees of abrasion. The macro and micro texture evaluation indexes were obtained after data filtering and separation, and correlation analysis was conducted with anti-skid performance indexes. The results showed that: the mean profile depth MPD-1 of asphalt pavement could characterize the macro texture abrasion properties well, and the root mean square deviation R-q-2 could characterize the micro texture abrasion well. Simultaneously, it was discovered that the skid resistance attenuation rate was AC > SMA > OGFC, and the larger the nominal maximum size of the same gradation, the lower the attenuation rate. It also found that enhancing the nominal maximum size of the asphalt mixture can effectively increase the macro texture, which in turn improved the anti-skid performance. The attenuation pattern of the macro texture index MPD-1 was consistent with the skid resistance, while the micro texture index R-q-2 decreased quickly in the early stage and was remain in the later stage. The research verified the feasibility of characterizing the skid resistance of asphalt pavements by macro and micro texture.
摘要：
The unique traffic situation at roundabouts causes complex interactions between merging vehicles, thereby increasing the likelihood of conflicts. Reliable prediction of conflict risk contributes to active safety improvement, but few studies have investigated the merge risk of roundabouts at a microscopic level. In light of this, this study develops a hybrid deep learning framework for predicting potential conflict risks in complex merging scenarios at roundabouts. Specifically, a roundabout coordinate system is devised to define vehicle characteristics based on trajectory data. Then, an improved 2D-TTC (time-to-collision) indicator is employed to identify two-dimensional merge conflicts. Since the surrounding vehicles may change as vehicles merge into a roundabout, this study analyzes several merging scenarios involving different vehicle groups and conflict durations in order to provide a comprehensive understanding of the conflict mechanism. For these scenarios, a hybrid model consisting of a convolutional neural network (CNN) and a long short-term memory network (LSTM) integrated with the convolutional block attention module (CBAM) is utilized to identify key features. The superiority of the proposed prediction method is demonstrated in comparisons with benchmark models. Results showed that segmental predictions were more accurate than overall predictions in terms of conflict duration. Furthermore, it is possible that a specific vehicle group has a decisive effect on the merging conflict risk, as indicated by the fact that information from multiple vehicle groups does not significantly improve the prediction performance. Another finding is that the driving state of vehicles merging at the roundabout varies considerably, but rarely with consecutive or multiple changes. The study provides novel insights into roundabout conflict prediction, which could serve as a tool for enhancing safety management involving complex traffic scenarios.
摘要：
This study focused on how aging affected the properties of steel slag. Steel slag was treated using hydrothermal aging and pressure steaming aging techniques to improve its bulk stability. Physical and mechanical characteristics, alkalinity, and mineral constituents, as well as micromorphology of steel slag, were investigated. The results demonstrated that water absorption, crushing value, and abrasion value were all decreased by hydrothermal and pressure steam aging. The f-CaO particle size, total slag hydration time, and slag alkalinity were all lowered by two aging procedures. At 90 degrees C aging for 2 days and 0.6 MPa pressure steaming for 3 h, the Ca(OH)2 and CaCO3 diffraction peaks were strengthened, whereas the f-CaO and f-MgO diffraction peaks were diminished. The f-CaO concentration and compaction pulverization rate steadily dropped as hydrothermal days and steaming pressure increased. The water immersion swelling rate was significantly reduced, which enhanced the slag's bulk stability. After ageing, scanning electron microscopy revealed increased CaCO3 production and enhanced steel slag stability. The optimal processes are recommended as hydrothermal treatment at 90 degrees C for 2 days and pressure steaming at 0.6 MPa for 3 h.
摘要：
Deicing agents may compromise the performance of asphalt mixture. This article aims to study the feasibility of using styrene-butadiene-styrene (SBS)/crumb rubber (CR) modifier to prepare a deicing asphalt mixture with satisfactory performance for ultra-thin wearing course. High/low-temperature performance, water stability and deicing-related performances of the asphalt mixture were evaluated by conducting a series of laboratory tests from micro to macro level considering different incorporation rates of anti-freezing agent and SBS/CR modifier. The results find that SBS/CR modification enhances the high and low-temperature properties of the binder, and optimal incorporation ratios are 2% and 16%, respectively. The addition of anti-freezing agents as the filling material improves the high-temperature performance of the mortar, but negatively affects low-temperature performance. For asphalt mixtures, anti-freezing agents can enhance high-temperature performance by up to 56%, with only a minor impact on anti-sliding properties. However, they harm the low-temperature performance and water stability. A recommended maximum replacement ratio of 80% achieves satisfactory results in dynamic stability (11,053 times/mm), flexural strength (8.41 MPa), tensile strain (3011.08E-6), Marshall stability (9.61 MPa), Marshall residual stability ratio (81.28%), and free-thaw splitting ratio (80.30%), meeting the engineering standards. An Anti-freezing agent replacement ratio from 20% to 100% correlates linearly with a snow-melting rate of 16.3%- 96.8% and a deicing rate of 9.4%- 57.0%. The conductivity of soaking solution has been identified as a valuable indicator for predicting the asphalt functionality. This research can provide valuable insights into the mixture design and facilitate the practical implementation of this innovative functional material.
摘要：
Due to viscoelastic characteristics, the strength values of the high-modulus asphalt mixtures (HMAM) obtained under different conditions (temperatures, loading rates, and stress states) are quite different, and the serving conditions of asphalt pavements are also varied. Thus, the strength under fixed conditions cannot reflect the mechanical performances of materials under real serving conditions, which leads to inaccuracies in the asphalt pavement structural design. To develop a precise strength evaluating method for high-modulus asphalt mixtures, the strength tests of high-modulus asphalt mixtures were implemented under different conditions (temperatures, loading rates, and stress states) in this study. The test results indicated that for each stress state, the variation of strength with loading rates under different temperatures can be characterized by power functions, and the variation of strength with temperatures under different loading rates can be characterized by exponential functions. The uniform characterizing model of strength under different conditions was established through the dimensionless method and the sigmoidal function. With the effects of temperature, loading rates, and stress states included, the strength obtained can better reflect the mechanical performances in actual pavement serving conditions. The research results contribute to the improvement of the structural resistance design of the asphalt pavement with high-modulus asphalt mixtures.
