Design and evaluation of UHPP steel bridge deck pavement for high-temperature and rainy regions

To enhance the serviceability of steel bridge deck pavement(SBDP)in high-temperature and rainy regions,a concept of rigid bottom and flexible top was summarized using engineering practices,which led to the proposal of a three-layer ultra-high-performance pavement(UHPP).The high-temperature rutting resistance and wet-weather skid resistance of UHPP were evaluated through composite structure tests.The internal temperature distribution within the pavement under typical high-temperature conditions was analyzed using a temperature field model.Additionally,a temperature-stress coupling model was employed to investigate the key load positions and stress response characteristics of the UHPP.The results indicate that compared with the traditional guss asphalt+stone mastic asphalt structure,the dynamic stability of the UHPP composite structure can be improved by up to 20.4%.Even under cyclic loading,UHPP still exhibits superior surface skid resistance compared to two traditional SBDPs.The thickness composition of UHPP significantly impacts its rutting resistance and skid resistance.UHPP exhibits relatively low tensile stress but higher shear stress levels,with the highest shear stress occurring between the UHPP and the steel plate.This suggests that the potential risk of damage for UHPP primarily lies within the interlayer of the pavement.Based on engineering examples,introducing interlayer gravel and optimizing the amount of bonding layer are advised to ensure that UHPP possesses sufficient interlayer shear resistance.

Paving Materials and Engineering Applications of Permeable Pavement

The stability of roads in cities directly affects the safety of traffic and transportation.In the process of pavement laying,relevant personnel should use permeable paving materials in the process of construction.Based on the analysis of road drainage requirements,traditional paving materials have relatively poor water permeability,which leads to ponding problems during road use[1].Within this frame of reference,beginning with the characteristics of permeable paving materials,this paper makes an in-depth exploration on practical application measures.

Rubblization: A Practical, Cost Effective and Sustainable Option for Repairing Deteriorated Airfield Pavement in the Empty Quarter Desert of Saudi Arabia

Rubblization technique has been extensively used to repair the damaged concrete pavement and has proven successful in developed countries like the US and Europe. It has not been fully adopted in developing region like the Middle East and this paper presents the design and construction challenges posed while assessing damaged concrete runway in empty quarter of Saudi Arabia. A number of design options for repairs for runway pavement were considered and rubblization was chosen as a preferred option for repair. This paper includes the consideration for the assessment and adoption of the concrete rubblized modulus value using the falling weight deflectometer, optimization of the tests for the whole runway using the Heavy Weight Deflectometer HWD testing to replace pits, safely working around the utilities, reasonable assumption of drop height of the pavement and installation of utility conduits in the rubblized layer. Findings of the paper demonstrates resolving technical issues which are not very well covered in the Federal Aviation Authority (FAA) EB-66 such as the additional test strips, minimum areas of rubblization for assessment using test pits, drop in the height of concrete surface and fixing of utilities in rubblized pavement. The case study demonstrates that the rubblization can be successfully carried out in remote locations like empty quarter of Saudi Arabia with carefully carried out detailed site investigations, adopting correct assumed design rubblization modulus, quality control using HWD, protection of utilities while rubblizing and use of polymer modified asphalt for successful project deployment.

Pavement structure and materials design for sea-crossing bridges and tunnel:Case study of the Hong Kong-Zhuhai-Macao Bridge

With the continuous development of bridge and tunnel construction technologies,large-scale sea-crossing bridges and tunnels have gradually become the preferred choice for regional traffic.The construction technology of Hong Kong-Zhuhai-Macao Bridge(HZMB),one of the most representative sea-crossing passageways,is instructive for the construction of other large sea-crossing infrastructures.At present,the pavement design method of sea-crossing passageways lacks pertinence as it still refers to specifications for design of common pavement.Therefore,it is necessary to consider the bridge and tunnel pavement of HZMB as a typical example to analyze key technical problems encountered in its design,construction and operation.Novel solutions for material selection and structural design built upon the analysis of such critical problems should thus follow up.Based on comprehensive literature research,it can be found that environmental variability,tunnel closure,structural differential settlement and expansion deformation are the key technical problems faced by pavement of sea-crossing passageways.In view of the environmental variability,the steel deck-paving material and structure design of GMA-10 t SMA-13 is innovatively proposed.As for the closure of immersed tube tunnel,warm-mix flame retardant asphalt mixture is used to control pavement design through key indexes such as temperature and limit oxygen index.Regarding the deformation of immersed pipe joints,BJ200 asphalt seamless expansion joint material is introduced,which effectively satisfies the multi-directional deformation between pipe joints and ensures the smoothness of the road surface and driving comfort.For segmental joints,double-layer waterproof-coiled material is used to effectively prevent reflective cracks while ensuring the continuity of asphalt concrete pavement.Therefore,this paper provides a panel of ideas and methods for the pavement design of the same type of sea-crossing passageways.

Influences of Used Parameters of Screw Distributor upon Mixture Paving Segregation

The paving segregation of asphalt mixture was closely related to the structure size and using parameters for the screw distributor of paver,and the paving uniformity of the mixture was determined by the screw blade diameter,pitch,and the position of the mixture in the screw distributor.Through researching the kinematics of the mixture in the screw distributor,the mathematical model was established,and the mathematical model was related with structural parameters,used parameters and material parameters.Through the mathematical model,the various parameters on the screw distributor job performance were analyzed,and the unstable area,meta-stable area and stable area were determined.In the project,the full-scale test in actual project was conducted by using the AC25 mixture.By changing the using parameters compare the paving operations,the results show that,the reasonable parameter will greatly improve the uniformity of paving,and the surface proportion of structural depth of mixture decrease from the 2.13 to 1.60.

谈Trupave聚酯玻纤布在改扩建路面防裂中的应用

介绍了Trupave聚酯玻纤布的特性和应用范围,阐述了Trupave聚酯玻纤布在路面改扩建工程中的施工技术及材料设备,指出Trupave聚酯玻纤布是解决路面裂缝及水损坏问题的首选方案,应用前景广阔。

Application of Millimeter 3D Automatic Paving System in Highway Engineering Construction

In the construction of asphalt mixture pavement,there are many paving construction procedures,high requirements for machinery and personnel,unreasonable technology and so on.In this paper,the millimeter-scale 3D automatic paving control technology of asphalt mixture pavement is studied with an engineering example.From the analysis of the test results in the later stage of construction,it can be seen that the technology has achieved the goal of high precision paving,and the successful application of the technology provides valuable reference experience for similar asphalt concrete pavement construction in the future.

3D摊铺技术在沥青路面施工中的应用研究

为解决传统沥青面层摊铺过程中摊铺平整度、厚度及坡度不满足技术要求等问题,通过引入3D摊铺智能控制技术,不仅使沥青面层摊铺后的平整度、厚度及坡度得到了精准控制,同时也节约了施工成本。结合工程实例,简要介绍了3D摊铺技术原理,通过分析工程检测数据,结果表明:与传统路面摊铺技术相比,3D摊铺智能控制技术的运用使沥青路面平整度合格率达到90%以上、压实面横坡度波动范围较小、路面厚度偏差处于8%设计厚度之内,解决了传统施工摊铺过程中高程控制精度不良及面层平整度提升效果不明显问题,可在后续高等级沥青路面摊铺施工中继续推广。

混凝土公路路面施工质量问题及施工策略研究

对混凝土公路路面施工中的技术性要点与质量控制要点进行探究。阐述混凝土公路路面的施工策略,并介绍施工前期准备工作,对混凝土公路路面质量问题及其施工策略进行分析,重点对前期工作和原材料质量把控两方面的公路路面施工质量把控要点进行探讨。

3D摊铺系统在路面高程与横坡控制中的应用

为解决传统2D摊铺技术缺陷的问题,山西省静兴高速公路项目采用新型工艺激光测量高精度控制系统进行路面摊铺,研究表明,激光测量高精度控制系统毫米级的流动站可便捷地实现整个摊铺作业的全过程控制,可预先对道路设计的数字化模型进行检查,实现摊铺过程实时检测和摊铺后的复检验收,从而达到施工全过程质量控制、实时掌控摊铺工作质量的目的。

公路沥青路面施工中的铣刨摊铺施工技术探讨

铣刨摊铺施工是公路工程沥青路面施工中的关键技术,具有操作便捷、占道时间少以及质量较高等优势,在提高公路工程路面施工质量方面起到了积极的促进作用,不仅可以对道路表层进行及时修补,还可以提高路面施工的平整度,对现有的路面结构可以进行翻修,科学处理路面施工中出现的不同病害问题,提高了路面行车的安全性能,保证了路面美观性和良好的路况,为路面行车安全提供了充分保障。对此,本文将主要介绍公路沥青路面铣刨摊铺技术的应用流程和具体方式,并提出技术质量控制要点。

水泥稳定碎石基层双层连续摊铺层间性能影响因素分析

为分析水泥稳定碎石基层层间界面强度的影响因素,通过直接剪切试验和直接拉伸试验,对不同的水灰比及水泥浆剂量进行分析,得到层间最佳水泥浆剂量及水灰比。基于层间嵌挤接触咬合作用,分析了下层压实度及混合料级配对层间界面结合强度的影响。结果表明,当水泥浆撒布量为0.315g/cm 2、水灰比为1∶1.5时,层间粘结强度提升最大;下基层压实度为94%时摊铺上层,上、下层之间能形成良好的嵌挤结构;粗集料含量的增加可进一步提高上、下层之间的嵌挤作用,提高上、下层之间的约束作用。通过实体工程对室内试验结果进行验证,发现水灰比对水泥稳定碎石层间性能的影响更加显著。

公路路面施工过程中的沥青摊铺施工技术研究

公路系统的建设和维护对社会经济发展和人们生活质量的提升至关重要。而作为公路路面施工的核心环节之一,沥青摊铺施工质量直接关系着公路的使用寿命和行车安全。随着交通运输需求的不断增长和公路建设规模的扩大,如何有效地应用先进的沥青摊铺施工技术成为当前亟待解决的问题。因此,深入研究沥青摊铺施工技术,探索其在公路建设中的应用和发展,具有重要的理论和实践意义。首先对沥青路面及摊铺机的组成进行介绍,其次重点分析公路沥青路面摊铺施工技术要点,希望能对该技术的应用有所帮助。

重庆山区桥梁面层应用3D摊铺技术的适用性研究

当前3D摊铺技术由于其高精度、无人化和高效率等优势,在道路铺装得到广泛应用。然而,目前3D摊铺技术在桥面铺装的案例较少,在重庆这多山区地区的应用更少,限制3D摊铺技术在桥面沥青路面的发展。该文首先介绍3D摊铺技术的原理及核心技术,其次通过3D摊铺技术与传统摊铺在重庆在建五布河特大桥的应用对比,对2种摊铺方式的摊铺质量进行多尺度分析。结果表明,应用3D摊铺技术的路面均符合规范要求,其平整度、纵断高程差、横坡度和摊铺厚度又均优于传统摊铺路面,3D摊铺技术在重庆地区桥面沥青面层铺装具有良好的适用性。

公路工程中沥青混凝土摊铺技术分析

公路工程的沥青路面摊铺施工技术在现代交通建设中扮演着至关重要的角色。随着高速公路建设进程的加速和交通需求的不断增长,对道路的质量和安全性要求也日益提高。因此,有效地应用沥青路面摊铺施工技术成为确保道路质量、延长使用寿命以及提升交通运输效率的关键。首先对沥青路面的组成及结构进行介绍,其次具体介绍公路沥青混凝土摊铺施工中摊铺机参数的设置措施,并分析摊铺施工技术的要点,希望能对该技术的应用有所帮助。

公路路面施工中沥青摊铺施工技术质量管理研究

公路路面施工中沥青摊铺是保障道路使用寿命和行车安全的关键环节。其施工技术质量直接影响着道路的平整度、耐久性、使用性能。为确保施工质量,提高道路服务水平,该文将深入探讨沥青摊铺施工技术的质量管理。通过对施工过程中关键环节的规范、监控及优化手段的研究,旨在推动施工质量的提升,降低维护成本,最终实现公路交通运输的安全、高效、可持续发展,为公路工程从业者提供科学指导,推动公路建设行业的不断创新与发展。

国产大功率摊铺设备对沥青路面平整度影响分析

为分析国产大功率摊铺设备对沥青路面平整度的影响,依托吴圩至大塘高速公路,利用国产大功率摊铺设备及进口摊铺设备铺筑沥青路面试验段,对不同摊铺设备沥青路面各结构层平整度结果进行分析。结果表明:采用国产大功率摊铺设备可以提高横向摊铺均匀性,提升沥青路面平整度;大功率摊铺设备整机输出功率、整机质量及料斗容量越大,路面平整度水平越高。

复合橡胶沥青的性能影响因素分析

为进一步推进公路建设绿色发展,缓解废旧轮胎带来的环境压力,促进废旧轮胎胶粉改性沥青的推广应用,梳理了废胶粉改性沥青及其沥青混合料的相关研究成果,以橡胶粉、活化剂、芳烃油等多种材料,以不同的制备工艺和改变胶粉、改性剂掺量制备得到复合橡胶沥青,并进行了相关的沥青性能试验。通过不同发育时间的橡胶沥青性能,本着性能要求和节约能源的角度,确定了发育时间为0.5 h;活化剂掺量越多,对性能的影响越大,为了保证一定的延展性和弹性恢复率,建议活化剂掺量为0.7%;不同胶粉掺量对橡胶沥青的性能存在一定程度的影响,对比不同的指标,推荐胶粉掺量为18%。为了增加橡胶粉与基质沥青的相容性,可以适当地添加芳烃油,试验表明:芳烃油的添加可促进胶粉与沥青相容,降低黏度,有利于橡胶沥青混合料的制备。

TLA改性沥青路面施工质量控制技术研究

从TLA改性沥青拌和质量控制、TLA改性沥青混合料拌和质量控制以及改性沥青混合料运输质量控制等方面分析了沥青混合料质量控制的关键措施。通过摊铺底层质量、摊铺温度控制以及摊铺设备选择等方面对改性沥青路面摊铺质量控制关键措施进行了研究;通过有效压实时间和压路机合理组合以及压路机振幅选择策略等方面对TLA改性沥青路面压实质量进行了分析研究。

格林纳达圣乔治国际机场跑道沥青盖被不停航全断面摊铺施工工艺

结合格林纳达圣乔治国际机场跑道升级改造项目,针对跑道盖被工程中不停航施工的要求,从沥青混合料设计、盖被宽度、横坡度及机械数量等方面对无冷纵缝全断面摊铺施工工艺进行了分析研究,确定了机场道面沥青盖被不停航全断面摊铺施工工艺。实践表明,该工艺可在满足机场不停航施工条件下保证施工质量满足设计要求。