ABSTRACT A new asphalt pavement heat reflective coating was prepared with epoxy resin emulsion as the coating subs-trate, titanium dioxide, silicon dioxide, diatomite and hollow glass bead as the functional fillers, added fumed silica and other materials as the additives after surface modification. The color and optimum brushing quan-tity of the coating was determined by comparative experiments, and

ABSTRACT This article aims to outline the established Ground Penetrating Radar (GPR) applications for concrete pavements that are currently under development or not yet commonly applied. GPR is a non-destructive method that detects variations in the electromagnetic properties of materials, primarily the permittivity. The principles of GPR systems operation, including signal processing and data interpretation

ABSTRACT Engineered Cementitious Composites (ECC) are considered a promising alternative for the construction of durable pavements. The objective of this study was to evaluate the effects of plasticity and flexural fatigue behaviour of ECC on pavement performance. A low-cost ECC using low fibre content (1.5% volume fraction), locally-available river sand and a high level of cement replacement with

ABSTRACT Vehicle overweighting has been one of the key driving forces of deteriorated pavements. The overweighting characteristics that dominate the pavement performance deterioration have been inadequately investigated. This study filled such a gap by analyzing the survival time of pavement under different overweighting scenarios. The survival model was based on the accelerated failure time (AFT)

ABSTRACT Roads, due to use and time, become aged and as a result, they require maintenance. This paper presents a promising technology to compensate ageing. The method uses porous aggregates as capsules containing rejuvenator. The rejuvenator will be released during the asphalt pavement's service life, reversing the impact of ageing on asphalt performance, properties and, thus, extending pavement's

ABSTRACT Traffic loading is considered one of the main factors contributing to pavement deterioration. Large illegal loads in the form of vehicles traveling with axle loads above the permissible legal limits and/or overall overweight magnify the traffic impact on the performance of pavements. These overloads contribute to the deterioration of pavement sections which leads to substantial maintenance

ABSTRACT X-ray micro-computed tomography (micro-CT) is an advanced technique able to provide a comprehensive examination of the volumetric characteristics of asphalt mixtures. A key step for the air void (AV) quantification using micro-CT images is the segmentation, which is a stage of the digital image processing. The most common segmentation technique, the manual threshold (TH) selection, depends

ABSTRACT Cement stabilised unpaved roads have been implemented worldwide in both developed and developing countries. In this research project, natural rubber latex (NRL) was used to improve the durability against wetting and drying (w-d) cycles of cement stabilised soil, under cyclic tensile loads. The influences of NRL replacement ratio on the indirect tensile strength (ITS), indirect tensile resilient

ABSTRACT Asphalt binder and mineral filler are mixed together to bond fine and coarse aggregates of asphalt mixture. The interaction between asphalt and filler plays an important role in deciding the rheological responses of asphalt mixture. Significant efforts have been devoted over the years to studying the asphalt–filler interaction in terms of mechanisms, evaluation methods and influence factors

ABSTRACT In this paper, fatigue response under cyclic loading of a high-modulus asphalt mixture (EME14) is numerically investigated based on a coupling approach between damage mechanics and visco-elastoplasticity. The DBN (Di Benedetto-Neifar) model along, an isotropic damage, and a fatigue damage law are adopted to implement both visco-elastoplastic and damage constitutive equations. A set of laboratory

ABSTRACT The transit of superheavy vehicles on the road network requires a specific authorisation, which results from a critical analysis of the vehicle's effect on the pavement and other road infrastructure. The assessment of the damage caused by these atypical loading conditions is based on the mechanistic-empirical approach to pavement analysis. In practice, two critical behaviours are taken as

ABSTRACT Mechanistic and microstructural characteristics of roller-compacted concrete (RCC) produced from recycled asphalt pavement (RAP) and geopolymer cement binder (GPC) were evaluated and compared with mixtures produced from ordinary Portland cement (OPC). It was found that RCC using geopolymer binder exhibited higher unconfined compressive strength, modulus of elasticity, and flexural strength

ABSTRACT Rutting prediction models are essential elements of efficient pavement management systems. Accuracy of commonly used predictive models necessitates knowledge of the input parameters that they incorporate and local calibration of the model coefficients. This study aims at developing a rutting prediction model that incorporates a limited number of inputs, yet is able to accommodate, with sufficient

ABSTRACT The increasing amount of waste vehicle tyres has already proved to be hard to dispose of properly and lead to environmental problems, such as soil contamination and toxic blazes. This study aimed to use recycled tyre rubber material (crumb rubber - CR) and combine it with well-known polymers in road engineering, such as styrene–butadiene-styrene (SBS) and/or a combination of SBS and ethylene-vinyl

ABSTRACT The use of reclaimed asphalt pavement (RAP) is believed to contribute significantly towards overall energy conservation and environmental protection efforts. However, the recycling of aged binder from RAP requires a fundamental understanding of the interaction mechanism between such rejuvenators with recycled and unmodified binders. This study quantitatively investigated the impact of such

ABSTRACT In this work, a phase field approach to modelling fracture in asphalt mixtures is presented. More specifically, a cohesive zone-based phase field model is used. The crack in the material is modelled as a regularised damage, smeared over a region of finite length, using a damage phase field variable. The damage variable takes on the value of 1 for a fully damaged surface to 0 for an intact

ABSTRACT Rural roads play an essential part in a country’s road network providing connectivity between the rural communities and the national roads. However, most of these roads are not maintained efficiently and safety issues are often not prioritised since pavement conditions are prioritised, especially in developing countries. Lack of reliable crash data, road condition monitoring regime are often

ABSTRACT This paper proposes a novel pavement transverse crack detection model based on time–frequency analysis and convolutional neural networks. The accelerometer and smartphone installed in the vehicle collect the vibration response between the wheel and the road, such as pavement transverse cracks, manholes, and normal pavement. Since the original vibration signal can only contain a one-dimensional

ABSTRACT The main task of this study is to introduce an applied methodology using terrestrial laser scanner for facilitating the process of detecting, measuring defects and evaluating the condition assessment of rigid pavement instead of traditional visual inspection methods which cause waste of time, high cost and work to disrupt traffic. Terrestrial laser scanner (TLS) was used to create a three-dimensional

ABSTRACT Reasonable establishment of maintenance prediction mechanism plays an important role in service performance and long-term performance of asphalt pavement. The presented study proposed a comprehensive maintenance evaluation system framework of asphalt pavement based on the full-cycle. Firstly, Pavement maintenance cycle was divided into five stages and three important maintenance opportunities

ABSTRACT Automated truck platooning may cause up to 85% reduction in truck following distance compared to conventional vehicles and therefore reduces rest periods between loading cycles on pavement materials. Fatigue cracking is one of the major distresses in asphalt pavement structures, and pavement fatigue life is highly dependent on rest periods between loading cycles. In this paper, Artificial

ABSTRACT Cracks in the asphalt are the first and most common deterioration type of roads that generally threaten the safety of roads and highways. In recent years, automated inspection has been considered due to the high cost and error of manual methods. For this purpose, different machine learning techniques have been developed. In this study, an integrated model is proposed, which involves the following

ABSTRACT Regular inspection of pavement cracks is an important task to ensure the safety of the transportation system. At present, many pavement crack detection methods still rely on the manual way. These methods are usually time-consuming and subjective. Moreover, although the automatic crack detection method has made great progress recently, there are still difficulties such as poor anti-interference

ABSTRACT This paper presents a new approach for calibration of Mechanistic-Empirical Pavement Design Guide (MEPDG) permanent deformation models using the Hamburg Wheel Rut Tester (HWRT) Data. The approach was applied on two Ontario mixes tested in HWRT to calibrate and validate the asphalt concrete (AC) rut models. Data from one Long-Term Pavement Performance (LTPP) programme test section in Ontario

ABSTRACT This study comparatively investigated and evaluated three volumetric methods for vertical porosity distribution measurement of pervious concrete pavement: the incremental water displacement method (IWDM), slice-water displacement method (SWDM) with nondemoulding cutting, and computed tomography (CT) scanning method (CTSM). The regional porosity in pervious concrete consolidated by surface

ABSTRACT This paper presents a new asphalt mixture design framework for predictive performance-engineered mix design (PEMD) and the theory and procedures that underlie the proposed design method. This method allows pavement engineers to determine an optimized mix design based on the predicted pavement/mixture performance for all possible combinations of a given set of component materials (i.e. aggregate

ABSTRACT Permeable concrete pavement is greatly beneficial and is required for parking lot and pedestrian walk in urban areas. Permeable concrete is a low density concrete that consists of more air voids which help in the infiltration of storm water. The present study, after examining many research works reviewed critically, proposes an enhanced permeable concrete with various mix proportions by conducting

ABSTRACT This study proposes a portable measurement system (PS) for pavement surface macrotexture, which improves the current detection technology and provides the necessary support for maintenance and evaluation works on urban roads, newly built roads, parking, footpath, tunnels, bicycle lanes, and short distance roads. The system can obtain the elevation values through a high precision laser sensor

ABSTRACT Over the recent years, considerable attention has been drawn to intelligent driving technologies and particularly to automated vehicles (AVs). The deployment of AVs would provide the opportunity to have more control over the dynamics of the vehicle, including its lateral movement, which can affect the pavement's long-term rutting performance. The controlled lateral movement of the AVs may

ABSTRACT Blending charts are widely used in the design of recycled asphalt mixes. The amount of recycled binder in the total blend (R/T) can be enhanced by the addition of rejuvenator. The present study investigated two methods of blending approaches. In approach 1, different levels of rejuvenator were added to the recycled binder and R/T was determined for a selected virgin and target binder grade

ABSTRACT Perpetual pavement has become an important research area of highway development in China. Ensuring the durability of materials is an essential measure to achieve the goal of perpetual pavement construction. This paper documents a study on how to prepare SBS modifier/crumb rubber composite-modified asphalt (SRA) by testing based on an orthogonal experimental design to obtain the optimum proportion

ABSTRACT Thermoreversible aging is an important factor that affects the durability of asphalt pavement in cold and high altitude areas. Although there has been increasing attention to the significance of thermoreversible aging in recent years, the contribution of asphalt components to thermoreversible aging remains unclear in the existing literature. To this end, potential components that may affect

ABSTRACT As a high-efficiency non-contact heating technology, induction heating has shown great application prospect in melting snow and de-icing of asphalt pavement and induced self-healing of damage of asphalt mixture. In this research, 4 lengths of steel fiber and three fiber contents were adopted. The effect of different lengths and contents of steel fiber on the performances, including optimum

ABSTRACT To explore the fatigue characteristics of self-compacting rubberized concrete (SCRC) pavement, notched slabs with a 10% rubber content were fabricated. Monotonic and fatigue tests were carried out, including incremental amplitude tests controlled by crack mouth opening displacement (CMOD), load, and alternative constant and incremental amplitude loads. Meanwhile, the fracture process was dynamically

ABSTRACT The traditional practice for pavement structural capacity evaluation is mostly dependent on the falling weight deflectometer (FWD) measurements. However, this practice has several challenges due to its stationary nature. Recently, a Rolling Weight Deflectometer (RWD), capable of measuring the pavement deflections at regular traffic speeds, has been introduced into the market. This research

ABSTRACT The pavement distress information is essential for evaluating the pavement. Automatic pavement inspection systems can be so beneficial in providing needed information on pavement conditions. The bleeding is one of the asphalt pavement distresses and directly affects the pavement skid resistance and road safety. This study aims to develop an image-based system for the comprehensive evaluation

ABSTRACT To ensure the effective bonding of each structural layer of pavement and improve the service quality and durability of pavement, the waterborne epoxy resin (WER) emulsified asphalt (WEREA) tack coat binders were prepared by using polyurethane-epoxy resin. The basic properties of WEREA, such as tensile strength, adhesion to aggregate, high temperature heat resistance and low temperature impact

ABSTRACT Owing to a reasonable correlation with field performance, dynamic modulus ( |E∗|) has been used as an input in pavement design specifications. With experimental determination of |E∗| issues, researchers have resorted to the use of predictive models. This study evaluates the underlying patterns in prediction error in these models using |E∗| database developed during NCHRP 1-40D study. The significant

ABSTRACT Porous asphalt concrete (PAC) constitutes large air voids and coarse aggregate, forming a unique aggregate structure. The open pore structure is advantageous in creating space for stormwater runoff to infiltrate into an underground basin and reduce tyre-road noise. However, this aggregate structure compromises the load-carrying capacity and deformation resistance of the mixture. Achieving

ABSTRACT This study seeks to examine the physical and high-temperature rheological performance of crude palm oil (CPO)/tire pyrolysis oil (TPO) composite asphalt to develop a more sustainable bio-rubberized asphalt (BRA) binder. The study uses the penetration, softening point, and dynamic viscosity tests to evaluate binder consistency and dynamic shear rheometer (DSR) tests to determine the linear

ABSTRACT This study describes the findings of an experimental work conducted on asphalt mixtures incorporated with copper slag (CS) and reclaimed asphalt pavement (RAP). CS and RAP are considered waste materials and these waste materials create enormous environmental issues. Their use in the highway construction sector will resolve the landfill problems associated with them. In this study, nine types

ABSTRACT The surface pavement infiltration is one of the main routes for the water to enter into a pavement structure. This infiltration must be measured since it produces damage to the pavement surface and the soil layers of the pavement. To measure the surface infiltration rates of pavements, a field infiltrometer was designed and instrumented. Using this equipment, several in-situ tests were conducted

ABSTRACT Transverse joint faulting is a common distress that develops in unbonded concrete overlays (UBOLs). In the previous predictive faulting model for UBOLs, artificial neural networks (ANNs) were trained to predict the critical response (deflections) resulting from traffic and environmental loads. These ANNs were trained using an extensive factorial of finite element runs of a field-validated

ABSTRACT Polyethylene (PE) and polyethylene glycol (PEG) with three different molecular weights are employed to modify bitumen, which is denoted as the polymer-modified bitumen (PMB). The samples, PMB-L, PMB-M and PMB-H, indicate PE/PEG modified bitumen in which PEG molecular weight is from low to high. PEGs and PMBs exhibit different crystallisation and melting behaviours measured by a differential

ABSTRACT The paper presents a comparison of friction coefficients and MPD (Mean Profile Depth) parameters of EAC (Exposed Aggregate Concrete) pavements with a maximum aggregate size of 8, 11 and 14 mm. In order to obtain for all tested EAC pavements the same conditions that simulate the phenomenon of polishing, tests were performed using a FAP (Friction After Polishing) machine in laboratory conditions

ABSTRACT This paper presents a concise approach for calibrating the damage models in the TxME, a mechanistic–empirical flexible pavement design model developed for Texas. The models calibrated are rutting, bottom-up fatigue cracking and transverse (thermal) cracking. Pavement performance observations from the Texas Department of Transportation (TxDOT) maintained Data Storage System (DSS) were used

ABSTRACT To solve the problems of insufficient flexibility and low-temperature cracking resistance of epoxy asphalt binders in steel bridge deck-paving, a segmented linear polyurethane (PU) asphalt binder with thermoplasticity was synthesised via a chain extension reaction between a PU pre-polymer and chain extender in asphalt matrix. Successful synthesis was confirmed through Fourier transform infrared

ABSTRACT The ageing of asphalt mixes catalyses the occurrence of several pavement distresses. This study assessed the influence of the nature and quantity of the filler on the ageing susceptibility of asphalt concrete. The designed asphalt mixes containing control filler (stone dust) and four industrial wastes (copper tailing, glass powder, Kota stone dust, and red mud) were added in different amounts

ABSTRACT Asphalt concrete (AC) is a composite material that exhibits time and temperature-dependent properties, and it is generally accepted that AC behaves as a linear viscoelastic solid at small strain levels. Nevertheless, different mechanisms and the damage evolution can change its behaviour from the linear viscoelasticity. This study was focused on identifying the causes of the deviation of AC

ABSTRACT Pavement structures must guarantee safety, trafficability and comfort to highways users during its service life. The quality of these parameters is related to distresses that may occur as surface distortions, that might be caused by mechanical behaviour problems and to surface texture, which also affect highway safety. The surface texture is evaluated by parameters such as microtexture and

ABSTRACT AASHTOWare Pavement ME Design software was developed as an advanced pavement design tool based on the mechanistic-empirical pavement design guide. Existing performance prediction models utilised in this design guide are nationally calibrated, and it is essential to calibrate these models based on the specific local materials and environmental conditions, and pavement performance information

ABSTRACT The purpose of this study is to compare the mechanical properties of continuous and discontinuous paving base mixtures. Two groups of different types of mixtures of upper and lower layers are designed. Two different forming methods are used for each type to simulate the construction process of double layer continuous and discontinuous paving. Then, unconfined compressive strength, splitting

ABSTRACT Though several attempts have been made in the past to develop performance prediction models for flexible road pavement in Nigeria, insufficient dataset remained the major problem of using such models. This study used Fuzzy logic theory which is capable of handling the challenge of imprecise dataset to develop a framework for performance prediction of flexible road pavement in Nigeria. A Fuzzy

ABSTRACT This paper represents the results of a comprehensive experimental work on developing high performance concrete mixes containing different percentages of electric arc furnace steel slag (EAFSS) coarse aggregate (0, 25, 50, 75, and 100% by weight) for sustainable pavements. The use of steel slag powder (SSP) and silica fume (SF) as a mineral filler was also investigated. Mechanical properties

ABSTRACT Gravel roads management systems (GRMS) are in need of an integrated and cost-effective approach for condition data collection. In order to fulfil this need, this paper validates the practicality of utilising deep learning and image classifiers in collecting corrugation data from gravel roads. The used image classifier in this study was developed using the TensorFlow framework. This classifier

ABSTRACT The pore-water pressure generated by intermittent dynamic vehicle loading under various saturation states is recognized as a critical factor influencing the behaviour of permeable pavement structures, especially the behaviour of UGB layer. However, the underlying mechanisms of hydro-mechanical interaction in the UGB layer and the influence on the pavement structure are still unclear. This

ABSTRACT Silty soil as a rich reserved subgrade fills in seasonally frozen regions of northern China, experienced at least one freeze-thaw (F-T) cycle each year. Many damages will occur after F-T cycles. In general, using cement to stabilise can alleviate that situation. Hence, a series of unconsolidated and undrained triaxial compression tests were conducted to evaluate the static properties (i.e

ABSTRACT Lime-cement stabilisation of clayey soils has been successfully used for many years. However, limited published studies have investigated the influence of varying mellowing period for two-stage lime-cement stabilisation on the secant elastic and resilient moduli of subgrade soils. The two-stage stabilisation starts with mixing the soil with lime, allow it to mellow for a specific period to

ABSTRACT Airport runway roughness can be characterised by power spectral density (PSD) and two spectrum parameters, namely, the unevenness index and waviness. In order to find suitable spectrum parameters for airport runway roughness, seven runway profiles in China were measured to expand the current database of runway profiles. The statistical distributions of the spectrum parameters for runway roughness

ABSTRACT This study aims to use traditional regression model and machine learning method to analyse the impact of traffic loading on pavement performance. Pavement condition data were obtained from pavement management systems (PMS) and axle loads of truck traffic were collected at weigh-in-motion (WIM) stations. Support vector regression (SVR) method was selected for modelling pavement performance