城市道路窨井沉陷病害成因分析及整治

城市道路是各类管线的重要载体,随着城市经济的快速发展,道路上各类管道的检查井越来越多,检查井产生的各类病害不仅影响景观,同时也给行车带来了安全隐患.本文分析了城市道路中窨井周围沥青混凝土路面产生凹陷、麻面、开裂、脱落、龟裂等病害的原因,结合自己工作实际从窨井的砌筑,路面的施工等方面阐述了消除上述病害的整治措施.     

路基工程技术对路面早期病害的影响

路基工程技术与路面早期病害之间存在较大联系，本文从路基工程的设计、施工和养护管理等方面分析了其对路面的影响，井提出相应的防治措施。     

试析水泥砼路面板真空灌浆技术应用

水泥混凝土路面在我国已有多年的使用历史,是我国公路路面主要形式之一,在我国公路网构成中占有较大比重.它具有强度高、刚度大、受温度影响小、使用寿命长等优点.但水泥混凝土路面接缝较多,对超载较为敏感,易发生脱空、唧泥、裂缝等先期病害,从而导致路面的破损.如何治理与预防脱空、唧泥等病害,搞好水泥混凝土路面的养护,延长公路的使用寿命,改善其通行能力,具有十分重要的意义.     

厂区砼道路的病害原因和防治

分析了厂区砼道路路面病害的产生原因，着重论述病害的防治措施，强调应重视厂区道路的日常养护工作，以减少维修费用，延长道路的使用寿命。     

浅谈沥青路面的预防性养护

作为高等级路面的沥青混凝土路面,长期在车辆行驶作用和自然影响下,会发生很多病害,最为常见的有:坑槽、车撤、波浪、松散、沉陷等,为了保持公路沥青路面良好的使用性能和最大限度地延长使用寿命.本文分析了沥青混凝土路面早期病害的表现,阐述了预防性养护的重要性和必要性,并概述了几种预防性养护机械的工作机理,进而说明了预防性养护的可行性.     

智能公路系统下的路面病害图像检测技术综述

本文梳理了国内外路面病害图像检测技术的研究进展。在智能公路系统的框架下,尝试提出路面病害检测的发展趋势。研究表明：路面病害检测已经历3个阶段,人工检测阶段、半自动化检测阶段、无损自动检测阶段。基于2D数字图像的路面检测具有数据采集便利、识别算法成熟的特点,尤其是近年深度神经网络在基于2D数据的病害检测上取得了高实时性和高鲁棒性的成果,适用于海量道路图像的自动化、实时化病害筛查;基于3D数字图像的路面检测具有识别精度高但采集效率有限的特点,适用于局部范围获取病害多维度信息。本文结合不同方法的现状与优势,尝试展望路面病害检测技术阶段4——多源分级检测阶段。该阶段依托高速物联网技术和人工智能技术,打破传统道路巡检车的局限,以大批量民用车辆为主要数据采集载体,分级利用深度神经网络的高实时性以及3D图像识别的高精度性,有针对性地实施道路监测与养护。     

浅谈旧水泥砼路面病害处治措施

对旧水泥砼路面病害进行了归类,分析了病害产生的原因,并提出了相应的处治措施．     

浅论沥青路面裂缝问题研究

路面裂缝作为沥青路面的常见病害，对于路面的行驶质量以及使用寿命具有极为不利的影响。沥青路面裂缝类型较多，裂缝形成的原因也各不相同，必须开展深入的研究。本文主要分析了沥青路面的不同类型及成因，并提出合理的预防处理措施，可以为沥青路面养护管理人员提供合理的参考。     

浅谈公路沥青路面裂缝的预防和处理

沥青路面具有表面平整、行车舒适、耐磨、噪音小、施工工期短、养护维修简便等优点,但由于受路面结构、气候、地形、地质条件、行车荷载等多种因素的影响,都会不同程度的产生裂缝,裂缝的存在不仅破坏了路面的连续性、整体性及美观,而且使自由水很容易进入沥青面层,使裂缝两侧的路面结构层和七路基的含水量增大,路基和路面强度降低,导致沥青路面产生各种病害,为了减少路面早期破坏,延长路面使用寿命,必须对沥青路面裂缝进行有效的维修.在当前公路建养资金尚不充裕的情况下,研究分析沥青路面裂缝产生的原因和防治措施具有十分重要的现实意义.     

沥青混凝土格栅层在城市水泥路面改造中的应用

以贵溪市建设大道、站前路、雄石路改造为例，介绍玻璃纤维格栅的技术性能指标及其施工工艺，旧路面防治处理，分析加铺沥青混凝土格栅层路面路用性能改善分析。     

武钢钢渣用作AC-10I型细粒沥青砼集料的研究

分析钢渣用作AC-10I型细粒沥青混凝土集料的性质以及其用于沥青混凝土路面的使用性能,发现钢渣具有良好的物理力学性能。与传统路面相比,钢渣沥青混凝土的路面性能优良,具有广阔的应用前景。     

南海大道东滨路以南段路面病害分析及改造

针对深圳市南海大道沥青混凝土路面出现的各种早期破坏的主要原因进行归类分析,从设计、施工、管理方面初步探讨应对措施和改进办法,以达到提高路面建设投资效能的目的。     

Successful Application of CLSM on a Weak Pavement Base/Subgrade for Heavy Truck Traffic

Lack of proper pavement base and subgrade compaction leads to premature failures that account for millions of dollars in damages. Controlled low-strength material (CLSM) concrete was introduced in this study as pavement base material near a manhole where proper compaction is unachievable. Rut-resistant stone matrix asphalt was placed on top of the CLSM as a wearing surface layer. Dynamic cone penetrometer (DCP) testing was used to monitor CLSM construction. One day after placing, the CLSM gained sufficient strength to support construction traffic. Further, DCP results indicated that the CLSM possessed uniform characteristics of concrete that could improve the load-bearing capacity and serviceability of the pavement near the manhole. After 18 months of heavy truck traffic, maximum rutting was 5?mm, well below the failure criteria of 12.5?mm. Based on cost and performance, CLSM concrete has the potential to improve problematic areas in pavement.     

钢渣SMA-13沥青混凝土及其服役性能研究

分析了钢渣SMA-13沥青混凝土集料的性质以及其用于沥青混凝土路面的服役性能,发现钢渣具有良好的物理力学性能。与传统SMA沥青混凝土路面相比,钢渣SMA-13沥青混凝土的路面性能较优良,具有广阔的应用前景。     

Performance of Geosynthetic-Reinforced Asphalt Pavements

This paper describes the performance of geosynthetic-reinforced asphalt pavement under monotonic, cyclic, and dynamic loading conditions. The study differed from current practice where geosynthetics are typically used as separators or to improve the bearing capacity of the subgrade. A geogrid layer was installed at the bottom of the asphalt concrete layer, along the asphalt-subgrade interface, to function as tensile reinforcement. The load was applied to the surface of the asphalt concrete layer using a rigid rectangular footing under plane strain conditions. The strains that developed along the geogrid over time and at different load levels were monitored. Two different types of geogrid reinforcements were used, and their restraining effects on the layered system were compared. The study showed that geosynthetic reinforcement increased the stiffness and bearing capacity of the asphalt concrete pavement. Under dynamic loading, the life of the asphalt concrete layer was prolonged in the presence of geosynthetic reinforcement. The stiffness of the geogrid and its interlocking with the asphalt concrete contributed to the restraining effect.     

NJTxtr—A Computer Program Based on LASER to Monitor Asphalt Segregation

Abstract: This paper describes the research funded by the New Jersey Department of Transportation to develop an automated technology to monitor segregation during construction of hot-mix asphalt concrete pavements. A Laser-based system was used to measure surface texture and to detect segregation. Two segregated test sections and a control test section were tested to evaluate the applicability of Laser texture method to detect and quantify segregation. Laser texture data were gathered from all three sections. Ratios of texture in segregated areas to that in nonsegregated areas were set as the basis for detection of different levels of segregation. By combining the level of segregation and extent of segregation, an AREA index was developed to determine the acceptability of a pavement section. Based on AREA index, pay adjustment factors were proposed to reduce the payment to account for loss of pavement life due to segregation. Further remedial actions were proposed to correct segregated pavement sections with acceptable AREA index. Based on the above concepts, Windows-based computer program NJTxtr was developed to detect and quantify segregation. This computer program uses the Laser-equipment-collected pavement texture data and determines whether the pavement section is acceptable or unacceptable based on the level of segregation within a pavement section, and provides bonus or penalties to the contractor. The paper describes a novel technology using laser and associated software for construction quality control of asphalt concrete pavements. The proposed methodology was applied to detect segregation in an interstate highway section in New Jersey, and this section was repaved based on visual observation and recommendation from this study.     

橡胶沥青应力吸收层在旧路面改造中的应用

分析了水泥混凝土路面沥青加铺层反射裂缝的产生机理,介绍橡胶沥青应力吸收层良好的抗反射裂缝效果及其路用性能.结合金溪县秀谷中大道改造工程的设计、施工情况,阐述了橡胶沥青应力吸收层在旧路面改造中的应用.     

Evaluation of Four Permeable Pavement Sites in Eastern North Carolina for Runoff Reduction and Water Quality Impacts

Four permeable pavement applications in North Carolina’s Coastal Plain were constructed and monitored to determine their effectiveness of reducing runoff quantity and improving water quality. Sites were either constructed of permeable interlocking concrete pavers (2), porous concrete (1), or concrete grid pavers (1). One site of each pavement type was monitored for runoff reduction for periods ranging from 10 to 26 months. Measured runoff depths from rainfall events over 50?mm were used to determine permeable pavement equivalent curve numbers for the sites, which ranged from 45 to 85. Only the two permeable interlocking concrete pavement (PICP) sites were monitored for water quality. Runoff and exfiltrate samples were intended to be collected, in addition to runoff monitoring, from the Swansboro PICP site. However, no runoff was produced during this study from the Swansboro PICP site for rainfall events up to 88?mm. From exfiltrate concentrations, nutrient retention was estimated to be 3.4 and 0.4?kg/ha/year for total nitrogen and total phosphorus, respectively. For the Goldsboro PICP site, water quality of asphalt runoff and PICP exfiltrate were compared. Analysis of water quality samples from the second site determined that concentrations of total Kjeldahl nitrogen, ammonia, total phosphorus, and zinc were significantly (p ? 0.05) lower in permeable pavement exfiltrate than asphalt runoff.     

Van Der Waals Force and Asphalt Concrete Strength and Cracking

Van der Waals force between neutral molecules is employed to characterize the interaction among molecules in asphalt cement. Several important consequences emerge from the consideration. The brittle strength of the asphalt binder is shown to be linked to the well depth of the Van der Waals potential and the mesoscopic cracks present within the asphalt binder. Moreover, the elastic modulus of asphalt binder is analytically related to the potential well depth. The strength of the asphalt concrete (AC) is estimated by considering aggregate surface characteristics and the adhesion strength between asphaltenes or resins and molecules of aggregates. These predictions can help design asphalt concrete pavement. Formulas for predicting the binder strength and the interfacial breaking strength between aggregates and binders are derived. These results are supported by reported data. Furthermore, an analytic expression for the strength of AC is given at temperature below the AC glass transition point.