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Long-term performance of recycled asphalt mixtures containing high RAP and RAS

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Journal of Road Engineering 2024年第1期4卷 36-53页

作者： Jiangmiao Yu Zengyao Lin Guilian Zou Huayang Yu zhen leng Yuan Zhang School of Civil Engineering and Transportation South China University of TechnologyGuangzhou 510641China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina State Key Laboratory of Subtropical Building and Urban Science South China University of TechnologyGuangzhou 510640China

The application of reclaimed asphalt pavement(RAP)and reclaimed asphalt shingles(RAS)on asphalt pavement can reduce the asphalt paving cost,conserve energy and protect the environment.However,the use of high contents of RAP and RAS in asphalt pavement may lead to durability issues,especially the fatigue cracking and thermal cracking.It is necessary to conduct a series of analyses on asphalt mixtures containing high RAP and RAS,and seek methods to enhance their long-term performance.This paper provides a comprehensive over-view of the long-term performance of recycled asphalt mixtures containing high contents of RAP and RAS.The findings in this research show that rutting resistance of high recycled asphalt mixtures is not a concern,whereas their resistance to fatigue and thermal cracking is not conclusive.Recycling agents can be used to improve the thermal cracking resistance of high recycled asphalt mixtures.An optimum decision on recycling agents will improve the durability properties of high recycled asphalt mixtures.It is recommended that to use a balanced mixture design approach with testing of the blended asphalt binders will provide better understanding of long-term performance of recycled asphalt mixtures containing high RAP and RAS.

关键词： Recycled asphalt mixture Recycling agents Long-term performance Cracking

考虑加载次序影响的沥青非线性疲劳损伤累积研究

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工程力学 2024年第5期41卷 68-76页

作者：房辰泽冷真郭乃胜李辉蒋继望陆国阳王昊鹏大连海事大学交通运输工程学院辽宁大连116026 香港理工大学土木及环境工程学系中国香港九龙999077 诺丁汉大学诺丁汉交通工程中心英国诺丁汉NG72RD

变幅加载下沥青的疲劳损伤累积具有明显的非线性特征,传统的Miner’s线性疲劳损伤累积准则无法表征不同变幅加载次序下沥青的非线性疲劳损伤累积(NLFDA)。该研究旨在建立考虑加载次序影响的NLFDA模型,准确表征加载次序对沥青疲劳损伤累... 详细信息

变幅加载下沥青的疲劳损伤累积具有明显的非线性特征,传统的Miner’s线性疲劳损伤累积准则无法表征不同变幅加载次序下沥青的非线性疲劳损伤累积(NLFDA)。该研究旨在建立考虑加载次序影响的NLFDA模型,准确表征加载次序对沥青疲劳损伤累积的影响。通过开展应力控制的沥青恒幅加载疲劳试验,采用耗散伪应变能(DPSE)表征沥青疲劳损伤,分析恒幅加载下沥青的疲劳损伤累积规律;采用低-高和高-低两种加载次序,开展应力控制的沥青变幅加载疲劳试验,分析变幅加载下沥青的疲劳损伤累积规律;基于损伤等效准则,建立考虑加载次序影响的NLFDA模型,分析加载次序对疲劳损伤累积的影响。结果表明:应力控制模式下的沥青疲劳损伤,呈先缓慢后急剧的非线性增加演化趋势;恒幅加载下沥青疲劳损伤服从Miner’s准则发生线性累积,且累积寿命分数等于1;变幅加载下沥青疲劳损伤不服从Miner’s准则而发生非线性累积。低-高和高-低变幅加载次序下,沥青累积疲劳寿命随一级寿命分数的增大而分别增加和减小,累积寿命分数分别大于1和小于1;建立的NLFDA模型可克服Miner’s准则缺陷,并较为准确地表征加载次序对沥青疲劳损伤累积的影响。

关键词：道路工程沥青材料非线性疲劳损伤累积加载次序耗散伪应变能疲劳寿命

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袋装螺蛳粉自动化包装生产线设计

机械工程师 2024年第3期 59-64页

作者：杨新新林贤坤冷臻广西科技大学机械与汽车工程学院广西柳州545000

随着袋装螺蛳粉销量与日俱增,已有的自动化程度较低的袋装螺蛳粉自动化生产线难以满足越来越多的订单需求,为了实现更高产量、更高效率,设计了一条袋装螺蛳粉自动化包装生产线,该生产线采用模块化设计,设计了各模块的机械机构,使用PLC... 详细信息

随着袋装螺蛳粉销量与日俱增,已有的自动化程度较低的袋装螺蛳粉自动化生产线难以满足越来越多的订单需求,为了实现更高产量、更高效率,设计了一条袋装螺蛳粉自动化包装生产线,该生产线采用模块化设计,设计了各模块的机械机构,使用PLC设计生产线的控制系统。该自动化包装生产线可实现袋装螺蛳粉的自动化上料、分拣、包装等环节。

关键词：自动化产线 PLC 螺蛳粉包装

A critical review of carbon materials engineered electrically conductive cement concrete and its potential applications

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International Journal of Smart and Nano Materials 2023年第2期14卷 189-215页

作者： Dong Lu zhen leng Guoyang Lu Daiyu Wang Yanlin Huo School of Civil Engineering Harbin Institute of TechnologyHarbinP.R.China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongP.R.China Department of Architecture and Civil Engineering City University of Hong KongHong KongP.R.China

Carbon materials engineered electrically conductive cement concrete(ECCC)is typically prepared by directly adding carbon-based conductive filler into the cement matrix and then mixing cement with aggregates.With such a strategy,ECCC possesses a high conductivity and strain/stress sensitivity and thus can be used for snow and ice melting,ohmic heating,cathodic protection system,electromagnetic shielding,structural health monitoring,and traffic detection.This paper aims to provide a systematic review on the development and applications of ECCC,especially the progress made in the past decade(from 2012 to 2022).The composition and manufacture of ECCC are first introduced.Then,the electrical performance of ECCC and its potential applications are reviewed.Finally,the remaining challenges for future work are discussed.

关键词： Carbon-based materials electrically conductive cement concrete(ECCC) structural health monitoring(SHM) electromagnetic shielding(EMI) pavement detection

Texturing and evaluation of concrete pavement surface:A state-of-the-art review

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道路工程学报(英文) 2023年第3期3卷 252-265页

作者： zhen leng Zepeng Fan Pengfei Liu Jonas Kollmann Markus Oeser Dawei Wang Xi Jiang Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina School of Transportation Science and Engineering Harbin Institute of TechnologyHarbin 150090China Institute of Highway Engineering RWTH Aachen UniversityAachen D52074Germany

Concrete pavement is accompanied by two major functional properties,namely noise emission and friction,which are closely related to pavement surface texture.While several technologies have been developed to mitigate tirepavement noise and improve driving friction by surface texturization,limited information is available to compare the advantages and disadvantages of different surface textures.In this study,a state-of-the-art and state-of-thepractice review is conducted to investigate the noise reduction and friction improvement technologies for concrete pavement surfaces.The commonly used tests for characterizing the surface texture,skid resistance,and noise emission of concrete pavement were first summarized.Then,the texturing methods for both fresh and hardened concrete pavement surfaces were discussed,and the friction,noise emission and durability performances of various surface textures were compared.It is found that the next generation concrete surface(NGCS)texture generally provides the best noise emission performance and excellent friction properties.The exposed aggregate concrete(EAC)and optimized diamond grinding textures are also promising alternatives.Lastly,the technical parameters for the application of both diamond grinding and diamond grinding&grooving textures were recommended based on the authors'research and practical experience in Germany and the US.This study offers a convenient reference to the pavement researchers and engineers who seek to quickly understand relevant knowledge and choose the most appropriate surface textures for concrete pavements.

关键词： Concrete pavement Surface texture Friction Noise emission Diamond grinding&grooving

Virtual strain loading method for low temperature cohesive failure of asphalt binder

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道路工程学报(英文) 2023年第3期3卷 300-314页

作者： Heyang Ding Hainian Wang Ziye Ma zhen leng Ponan Feng Tangjie Wang Xin Qu School of Highway Chang'an UniversityXi'an 710064China Institute of Highway Engineering RWTH Aachen UniversityAachen D52074Germany Department of Civil and Architectural Engineering KTH Royal Institute of TechnologyStockholm 10044Sweden Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina

Cohesive failure is one of the primary reasons for low-temperature cracking in asphalt pavements.Understanding the micro-level mechanism is crucial for comprehending cohesive failure behavior.However,previous literature has not fully reported on this aspect.Moreover,there has been insufficient attention given to the correlation between macroscopic and microscopic failures.To address these issues,this study employed molecular dynamics simulation to investigate the low-temperature tensile behavior of asphalt binder.By applying virtual strain,the separation work during asphalt binder tensile failure was calculated.Additionally,a correlation between macroscopic and microscopic tensile behaviors was established.Specifically,a quadrilateral asphalt binder model was generated based on SARA fractions.By applying various combinations of virtual strain loading,the separation work at tensile failure was determined.Furthermore,the impact of strain loading combinations on separation work was analyzed.Normalization was employed to establish the correlation between macroscopic and microscopic tensile behaviors.The results indicated that thermodynamic and classical mechanical indicators validated the reliability of the tetragonal asphalt binder model.The strain loading combination consists of strain rate and loading number.All strain loading combinations exhibited the similar tensile failure characteristic.The critical separation strain was hardly influenced by strain loading combination.However,increasing strain rate significantly enhanced both the maximum traction stress and separation work of the asphalt binder.An increment in the loading number led to a decrease in separation work.The virtual strain combination of 0.5%-80 provided a more accurate representation of the actual asphalt's tensile behavior trend.

关键词： Asphalt binder Cohesive failure Virtual strain load Molecular dynamics Maximum cohesive stress

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交通基础设施智能化研究进展

Engineering 2023年第5期24卷 239-252,I0007页

作者： Yan-Liang Du Ting-Hua Yi Xiao-Jun Li Xiao-Li Rong Long-Jun Dong Da-Wei Wang Yang Gao zhen leng College of Civil and Transportation Engineering Shenzhen UniversityShenzhen 518061China School of Civil Engineering Dalian University of TechnologyDalian 116023China School of Civil and Transportation Engineering Beijing University of Civil Engineering and ArchitectureBeijing 102616China Department of Geotechnical Engineering College of Civil EngineeringTongji UniversityShanghai 200092China School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing 210094China School of Resources and Safety Engineering Central South UniversityChangsha 410083China School of Transportation Science and Engineering Harbin Institute of TechnologyHarbin 150090China School of Safety Engineering and Emergency Management Shijiazhuang Tiedao UniversityShijiazhuang 050043China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China

受最新材料科学、计算机技术、人工智能和自动控制技术的启发,新一代交通基础设施正在走向数字化和智能化。世界上许多主要发达国家都在因地制宜,积极推动智能创新技术在交通基础设施中的应用。本文首先简要介绍了交通基础设施智能化的... 详细信息

受最新材料科学、计算机技术、人工智能和自动控制技术的启发,新一代交通基础设施正在走向数字化和智能化。世界上许多主要发达国家都在因地制宜,积极推动智能创新技术在交通基础设施中的应用。本文首先简要介绍了交通基础设施智能化的基本概念、科学依据和发展历程。然后,按照设计、施工、运维、淘汰的全生命周期链条,系统分析了智能化技术的研究现状和面临的主要挑战。随后,以世界上第一条基于智能建设理念建设的铁路——北京-张家口高铁为例,全面介绍了智能技术的最新成就。最后,从标准体系、理论方法和人才培养三个维度对交通基础设施智能化的未来发展进行了探讨。

关键词：交通基础设施自动控制技术人工智能计算机技术全生命周期智能技术智能化技术人才培养

Sustainable Practice in Pavement Engineering through Value-Added Collective Recycling of Waste Plastic and Waste Tyre Rubber

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Engineering 2021年第6期7卷 857-867页

作者： Xiong Xu zhen leng Jingting Lan Wei Wang Jiangmiao Yu Yawei Bai Anand Sreeram Jing Hu Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong Kong 999077China School of Civil Engineering and Architecture Wuhan Institute of TechnologyWuhan 430073China Henan Province Highway Management Center of Toll and Loan Zhengzhou 450000China School of Civil Engineering and Transportation South China University of TechnologyGuangzhou 510641China Key Laboratory of Road and Traffic Engineering Tongji UniversityShanghai 201804China

Waste plastics,such as waste polyethylene terephthalate(PET)beverage bottles and waste rubber tyres are major municipal solid wastes,which may lead to various environmental problems if they are not appropriately recycled.In this study,the feasibility of collectively recycling the two types of waste into performance-increasing modifiers for asphalt pavements was analyzed.This study aimed to investigate the recycling mechanisms of waste PET-derived additives under the treatment of two amines,triethylenetetramine(TETA)and ethanolamine(EA),and characterize the performances of these additives in modifying rubberized bitumen,a bitumen modified by waste tyre rubber.To this end,infrared spectroscopy and thermal analyses were carried out on the two PET-derived additives(PET–TETA and PET–EA).In addition,infrared spectroscopy,viscosity,dynamic shear rheology,and multiple stress creep recovery tests were performed on the rubberized bitumen samples modified by the two PET-derived additives.We concluded that waste PET can be chemically upcycled into functional additives,which can increase the overall performance of the rubberized bitumen.The recycling method developed in this study not only helps alleviate the landfilling problems of both waste PET plastic and scrap tyres,but also turns these wastes into value-added new materials for building durable pavements.

关键词： Waste polyethylene terephthalate Waste tyre rubber Rubberized bitumen Recycling mechanism Sustainability

Neural network study of the nuclear ground-state spin distribution within a random interaction ensemble

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Nuclear Science and Techniques 2024年第3期35卷 216-227页

作者： Deng Liu Alam Noor A zhen-zhen Qin Yang Lei School of Mathematics and Physics Southwest University of Science and TechnologyMianyang 621010China School of Nuclear Science and Technology Southwest University of Science and TechnologyMianyang 621010China

The distribution of the nuclear ground-state spin in a two-body random ensemble(TBRE)was studied using a general classification neural network(NN)model with two-body interaction matrix elements as input features and the corresponding ground-state spins as labels or output predictions.The quantum many-body system problem exceeds the capability of our optimized NNs in terms of accurately predicting the ground-state spin of each sample within the TBRE.However,our NN model effectively captured the statistical properties of the ground-state spin because it learned the empirical regularity of the ground-state spin distribution in TBRE,as discovered by physicists.

关键词： Neural network Two-body random ensemble Spin distribution of nuclear ground state