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Development and road performance of clear asphalt with high transparency and adhesion

《结构与土木工程前沿（英文）》 2023年第17卷第2期页码 238-255 doi: 10.1007/s11709-022-0898-x

摘要： Clear asphalt (CA) currently used in light-colored asphalt mixtures (LCAM) exhibits poor transparency and adhesion. Therefore, a highly transparent CA (HCA) modified using a silane coupling agent (KH550) was prepared. Furthermore, LCAM was prepared by mixing CA and limestone aggregates. The properties of the HCA and ordinary CA (OCA) were characterized using conventional asphalt tests, optical tests, pull-off tests, ultraviolet aging tests, dynamic shear rheometry, Fourier-transform infrared spectroscopy, differential scanning calorimetry, and scanning electron microscopy. Whereas Marshall, moisture resistance, wheel tracking, trabecular bending, and British pendulum tests were employed for the LCAM. The transmittance and spectral reflectance of the HCA were 123.30 and 3.74 times greater than those of the OCA, respectively. The complex modulus and viscosity-aging index of the HCA were 48% and 53% less than those of the OCA, respectively. After modification with KH550, the Marshall stability ratio, tensile strength ratio, and flexural strain of the HCA-prepared LCAM increased by 12.92%, 25.06%, and 23.90%, respectively. However, the rutting resistance of the HCA-prepared LCAM was 14.3% less than that of the OCA-prepared LCAM. The comprehensive performances of the HCA and HCA-prepared LCAM were 49.2% and 10.3% greater than those of the OCA and OCA-prepared LCAM, respectively, indicating a high application value in the future.

关键词： light-colored asphalt pavement orthogonal test road performance spectral reflectance silane-coupling agent

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Connection of the prefabricated updeck of road tunnels by a short lap-spliced joint using ultra-high-performance

《结构与土木工程前沿（英文）》页码 870-883 doi: 10.1007/s11709-023-0977-7

摘要： Prefabricated internal structures of road tunnels, consisting of precast elements and the connections between them, provide advantages in terms of quality control and manufacturing costs. However, the limited construction space in tunnels creates challenges for on-site assembly. To identify feasible connecting joints, flexural tests of precast straight beams connected by welding-spliced or lap-spliced reinforcements embedded in normal concrete or ultra-high-performance fiber-reinforced concrete (UHPFRC) are first performed and analyzed. With an improvement in the strength grade of the closure concrete for the lap-spliced joint, the failure of the beam transforms from a brittle splitting mode to a ductile flexural mode. The beam connected by UHPFRC100 with short lap-spliced reinforcements can achieve almost equivalent mechanical performance in terms of the bearing capacity, ductility, and stiffness as the beam connected by normal concrete with welding-spliced reinforcements. This favorable solution is then applied to the connection of neighboring updeck slabs resting on columns in a double-deck tunnel. The applicability is validated by flexural tests of T-shaped joints, which, fail in a ductile fashion dominated by the ultimate bearing capacity of the precast elements, similar to the corresponding straight beam. The utilization of UHPFRC significantly reduces the required lap-splice length of reinforcements owing to its strong bonding strength.

关键词： UHPFRC prefabricated updeck road tunnel lap-spliced rebars flexural tests

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无损检测技术评估和检测道路性能

郭成超,许朋飞,钟燕辉

《中国工程科学》 2017年第19卷第6期页码 72-79 doi: 10.15302/J-SSCAE-2017.06.011

摘要：

目前，在我国的基础设施管理方面，存在维修工作安排不当、养护维修不及时、维修预算支出庞大等问题。因此，为了保障道路安全，防止发生灾难性的破坏，需要采取快速、有效的养护管理方法，以提高道路的使用寿命。根据美国材料与试验协会（ASTM）路面状况评价标准，本文介绍了五种道路无损检测技术和设备：落锤式弯沉仪、探地雷达、宏观构造深度、国际平整度指数和面波的频谱分析，并分别介绍了每种检测技术的工作原理和运用方法，以指导相关人员结合实际合理选用。运用这几种检测方法将会在不封闭交通的情况下加快评估速度，并为搭建一个高效、智能的路网监测系统提供技术支持，为道路的可持续发展、资金的高效利用提供切实可行的方法。

关键词：道路检测道路病害无损检测

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An investigation on modification mechanism of CH

Qiang XIN, Shanghong HUANG

《结构与土木工程前沿（英文）》 2017年第11卷第3期页码 293-300 doi: 10.1007/s11709-017-0403-0

摘要： Rising oil price has brought huge cost pressure for low grade highway construction, and it is urgent to find alternative resources. At the same time, there are nearly 50000–60000 tons of low temperature coal output in inner Mongolia region, China, which has high toxicity and high polluting. To make the low temperature coal be applicable for road constructions, the formaldehyde is used as cross linking agent, the concentrated sulfuric acid is used as catalyst, and the chemical modification of low temperature coal tar pitch in Inner Mongolia region is investigated. The road performance (softening point, penetration and ductility) of modified low temperature coal are tested. Results shown that the road performance of modified low temperature coal is increased significantly. Modification mechanism of low temperature coal is studied by Scanning Electron Microscopy and other analytical tools. Results show that, in the modified low temperature coal, resin content increases and the resin fiber diameter becomes larger with the increasing of formaldehyde content.

关键词： low temperature coal tar pitch modification road performance

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北斗“一带一路”服务性能增强技术研究

周建华,陈俊平,张晶宇

《中国工程科学》 2019年第21卷第4期页码 69-75 doi: 10.15302/J-SSCAE-2019.04.005

摘要：

为了破解北斗应用“走出去”的难题，本文结合卫星导航应用及产业发展的整体趋势，对北斗卫星导航系统（以下简称“北斗”）的服务性能、应用现状进行了总体评估和分析。针对北斗应用“走出去”，分别从系统服务、特色服务、应用产业三个层面上分析了“一带一路”沿线北斗应用推广存在的主要难题，论证说明提升北斗差异化的竞争力是破解北斗“走出去”的重要途径。基于以上分析，针对北斗星基增强和短报文服务，设计两种特色服务在“一带一路”沿线推广应用的初步技术途径和方案。通过在“一带一路”沿线国家设置十多个海外监测站，可满足“一带一路”国家和地区高精度位置服务的绝大部分需求；通过研制建设北斗短报文海外服务系统，可为海量的“一带一路”沿线用户提供性能更优、体验更好的短报文通信服务；针对性给出了北斗特色服务的示范应用推广构想。最后，从政策层面提出了加快推进北斗在“一带一路”沿线国家应用的保障建议。

关键词：卫星导航，北斗，“一带一路”，应用推广，示范应用

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长大公路隧道火灾安全疏散性能化设计与分析

陈长坤,徐志胜

《中国工程科学》 2007年第9卷第9期页码 78-83

摘要：

基于性能化防火设计方法，分析火灾条件下长大公路隧道内人员疏散行为的特点，给出隧道内人员疏散的安全判据，并结合某隧道的结构及车流特征对人员疏散过程进行了数值模拟研究，分析隧道在正常通车和局部行车堵塞时，不同火源位置、横通道间距与横通道宽度对人员疏散时间及安全状态的影响。结果表明,与建筑内人员疏散不同，长大公路隧道内火灾的可用安全疏散时间(ASET)与需要的安全疏散时间(RSET)均为沿隧道长度方向位置的函数。隧道内人员安全疏散的时间曲线在各横通道疏散口出现峰值，这主要是受到横通道通行能力的限制，各疏散口人员集聚等待所致。当隧道发生局部堵塞时，横通道口需要的安全疏散时间显著增加，危险性也急剧增大。隧道内人员疏散的性能化防火设计应综合考虑火源位置对人员载荷及疏散口位置可用安全疏散时间的影响。该研究为公路隧道火灾安全疏散设施的优化设计提供依据。

关键词：疏散火灾隧道横通道性能化防火设计

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Characteristics and application of road absorbing solar energy

Zhihua ZHOU, Shan HU, Xiaoyan ZHANG, Jian ZUO

《能源前沿（英文）》 2013年第7卷第4期页码 525-534 doi: 10.1007/s11708-013-0278-2

摘要： If the heat of road surface can be stored in summer, the road surface temperature will be decreased to prevent permanent deformation of pavement. Besides, if the heat stored is released, it can supply heat for buildings or raise the road surface temperature for snow melting in winter. A road-solar energy system was built in this study, and the heat transfer mechanism and effect of the system were analyzed according to the monitored solar radiant heat, the solar energy absorbed by road and the heat stored by soil. The results showed that the road surface temperature was mainly affected by solar radiation, but the effect is hysteretic in nature. The temperature of the solar road surface was 3°C–6°C lower than that of the ordinary road surface. The temperature of the solar road along the vertical direction was 2°C–5°C lower than that of the ordinary road. The temperature difference increased as the distance to the heat transfer tubes decreased. The average solar collector efficiency of the system was 14.4%, and the average solar absorptivity of road surface was 36%.

关键词： solar energy road-solar energy system road surface temperature solar absorptivity of road surface solar collector efficiency of system

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新型高黏度改性沥青的研发和应用

杨林江

《中国工程科学》 2008年第10卷第12期页码 92-96

摘要：

针对杭州湾大桥桥面铺装对高黏度改性沥青的技术要求，研发了一种新型高黏度改性沥青［1］。通过分析基质沥青、SBS、化学助剂的红外光谱，在研究沥青改性过程中微观结构变化规律的基础上，提出了采用SBS加化学接枝反应剂（增黏剂）TW-1和增容剂TW-2的沥青改性配伍设计，使改性沥青在提高低温延度、弹性恢复能力的同时，大幅度提升了60 ℃动力黏度，而施工和易性不受影响，产品在杭州湾大桥工程中得到了成功的应用。

关键词：杭州湾大桥高黏度改性沥青配伍机理红外光谱分析路用性能施工性能

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Special issue: Management of road and railway traffic and transportation engineering

Yongfu SUN, Ziyou GAO

《工程管理前沿（英文）》 2017年第4卷第4期页码 385-387 doi: 10.15302/J-FEM-2017110

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Rational Understanding about Renaissance Path of China's Road and Bridge Engineering

Mao-run Feng,Zheng-song Zhao

《工程管理前沿（英文）》 2014年第1卷第1期页码 42-51 doi: 10.15302/J-FEM-2014013

摘要： At the turn of this century, China began the largest road and bridge development in the world, which has virtuously interacted with the social and economic development and has elevated the engineering technology to world-class level. Surveying the development of world transportation, and comparing the road and bridge construction efforts of Europe, U.S.A, Japan and China, general experiences of success can be derived as follows: It is greatly beneficial to give priority to transportation for economic development; it takes national strategy and social action to build up a transportation network; demand and innovation are the driving forces to upgrade road and bridge technology; management innovation and quality assurance can greatly improve development caliber. While rationally acknowledging China's transportation infrastructure achievements, we should reflect on issues with Chinese characteristics that have affected quality and efficiency, expose all construction practices that violate scientific law, overall management defects in road and bridge construction and maintenance, and search for new ways to strengthen social management and the creation of a healthy soft environment.

关键词： road network expressway bridge project technological innovation construction management social management

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Quantification of emission variability for off-road equipment in China based on real-world measurements

《环境科学与工程前沿（英文）》 2022年第16卷第2期 doi: 10.1007/s11783-021-1455-x

摘要：

• Emissions from 53 in-use diesel-fueled off-road equipment were measured.

关键词： Off-road equipment Portable emission measurement system (PEMS) Real-world emissions Diesel engine

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“Heavenly Road”: The Qinghai–Tibet Railway

Yongfu SUN

《工程管理前沿（英文）》 2020年第7卷第2期页码 304-307 doi: 10.1007/s42524-019-0079-3

摘要： Xiaobo WANG. [J]. Front. Eng, 2019, 6(1): 131-137.Peter REDFERN, Hua ZHONG. [J]. Front. Eng, 2017, 4(2): 193-200.Qixiang FAN. [J]. Front. Eng, 2017, 4(2): 231-237.Ming-zhou Liu,Cong-hu Liu,Mao-gen Ge,Yuan Zhang,Qing-hua Zhu. [J]. Front. Eng, 2016, 3(2): 144-146.Yu Zhao,Sheng-quan Wang,Ke-chao Zhu. [J]. Front. Eng, 2015, 2(1): 35-38.Ru-gui Chen,Jia-meng Chen. [J]. Front. Eng, 2014, 1(1): 52-61.An Wang. [J]. Front. Eng, 2014, 1(1): 13-17.

关键词： permafrost protection sustainable development health guarantee system

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Impacts of opening baffle of city road tunnels on natural ventilation performance

Weixiao YANG, Jincheng XING, Jianxing LI, Jihong LING, Haixian HAO, Zhiqiang YAN

《结构与土木工程前沿（英文）》 2013年第7卷第1期页码 55-61 doi: 10.1007/s11709-013-0194-x

摘要： Based on the opening baffle mode for natural ventilation of city road tunnels, this paper studies the impacts of opening baffle on natural ventilation performance by verifying numerical simulation through model tests. By analyzing the impacts of installation angle, dimension, location, and quantity of opening baffle on ventilation performance, the paper reached the conclusions as follows: 1) When installation angle is larger than 45° and tunnel ventilation is well operated, the baffle exhaust could increase by at least 30% compared to when there is no baffle. 2) The baffle reaches its optimal performance when the length of the baffle is equal to the width of the city road tunnels. 3) Baffle exhaust could increase by 30% when it is installed in the downstream of openings. 4) The performance of a single baffle is better than that of multiple baffles.

关键词： city road tunnel numerical simulation baffle top opening natural ventilation

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Green Road Construction Technologies in Guangzhou

Guan-feng An,Wen-yuan Huang,Jing-feng Zhang

《工程管理前沿（英文）》 2016年第3卷第1期页码 80-86 doi: 10.15302/J-FEM-2016002

摘要： Total road pavement in Guangzhou reaches 77 ×10 m . Its huge maintenance and potential rehabilitation calls for a green road system. This paper presents a discussion, first about green road construction technologies together with their applications and development like reclaimed asphalt pavement, rubberized asphalt pavement, and warm mix asphalt; and then, about the key obstacles for promotion and activities, primarily for green road promotion, in the perspectives of the current technical and application situations in China and separately in Guangzhou. Based on environmental and conditional analysis, as well as a development expectation from an industrial viewpoint, this paper creates a development trend of green road technologies.

关键词： road green construction recycling of waste asphalt rubber asphalt

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浇筑式沥青混凝土性能影响因素研究

王宏畅,李国芬,章登精

《中国工程科学》 2013年第15卷第8期页码 70-74

摘要：

浇筑式沥青混凝土具有较高的变形随从性而在钢桥面铺装上得到了很多的应用，为研究浇筑式沥青混凝土的性能影响因素，采用4种合成级配、3种沥青用量，系统评价了各因素对浇筑式沥青混凝土性能的影响。通过流动度试验和贯入度试验确定最佳含油量，由高温车辙试验和低温弯曲试验进行路用性能检验。研究表明，级配形式和沥青含油量变化对混合料的性能指标的影响较大，因此，实际施工时应严格控制混合料的级配和沥青用量。

关键词：道路工程钢桥面铺装浇筑沥青混凝土流动度贯入度车辙