The influence of hydrated lime on moisture susceptibility of asphalt mixture was assessed using a combination of surface energy measurements and modified saturation ageing and tensile stiffness test. Four aggregate types, which are commonly used for manufacturing asphalt mixtures in the UK have been selected. These aggregates were from various rocks across the UK which includes felsic intrusive, calcite

Research has been done to obtain a Porous Concrete (PC) mixture capable of bearing heavy traffic loads while maintaining sufficient air voids (AV) to percolate water into the ground. This research aims to establish several design parameters in PC mixture dosage in order to generate a multi-criteria methodology that helps to obtain a final product, which is beneficial for both citizens and environment

This study presents the analytical models to predict the compressive strength of roller-compacted concrete pavement (RCCP) containing steel slag aggregate and fly ash. Based on the experimental results, three models were established in this study including multiple regression analysis (MRA), artificial neural networks (ANN) and fuzzy logic (FL). In the RCCP mixtures, cement was partially substituted

The use of concrete overlays has long been recognised as a cost-effective pavement maintenance and rehabilitation strategy. However, the long-term performance of various types of concrete overlays has not been fully investigated since there has not been enough performance data available to conduct such an evaluation. Concrete overlays have been regularly constructed on Iowa roadways since the late

Skid resistance is a key factor in road safety. Surface friction characteristics of roads are dependent on the microtexture and macrotexture of the surface. The decay of skid resistance with time is a function of traffic level and aggregate characteristics. This study developed predictive models for skid resistance of asphalt pavements and seal coat surfaces. The researchers examined the surface friction

The cumulative permanent strain of subgrade soils plays an important role in the pavement structure design and long-term pavement performance maintenance. In Southern China, the hot and humid climate increases the risk of becoming a saturated condition for subgrade soils. The saturated subgrade soils will generate significant cumulative permanent strain under long-term cyclic loading compared with

Rural roads play a pivotal role in facilitating connectivity for the rural communities by providing access for their economic and social needs. Due to lack of funding and other resources, maintenance decision making is often done in an ad-hoc and subjective manner. Moreover, the inability to collect extensive data as needed to run most pavement management systems and technical expertise required has

Assessment of the pavement condition plays a significant role in pavement maintenance and driving comfort enhancement. Current evaluation methods primarily employ manual weights according to the geometric appearance of the distress, which makes it difficult to assess its depth or impact on passengers’ experience. This paper proposes a data fusion-based method for pavement distress evaluation, which

Unsealed roads are an important asset providing the necessary connections between regional and metropolitan regimes of a country. However, these roads are affected by severe moisture fluctuations and recurring traffic loads that result in excessive maintenance. Unsealed road pavements are generally partially saturated during their service life, resulting in distinct volume and strength changes subjected

ABSTRACT The adhesive bonding strength of the membrane layers between the asphalt concrete surface layers and the decks of steel bridges has a strong influence on the fatigue life of orthotropic steel deck bridges (OSDBs). The most important requirement for the application of membrane materials to orthotropic steel deck bridges is that the membrane adhesive layer is able to sufficiently bond to its

Since its inception in 2000, Mississippi’s pavement warranty programme has been used to manage the maintenance activities of the warranty pavement projects. To determine whether a specific maintenance treatment is required on a warranty pavement section, distress measurements are taken and compared against warranty distress thresholds for each distress type. Then, the decisions of what maintenance

ABSTRACT The adhesive bonding strength of the membrane layers between the asphalt concrete surface layers and the decks of steel bridges has a strong influence on the fatigue life of orthotropic steel deck bridges (OSDBs). The interfacial properties between the membrane and the layers bonded to it have not been extensively studied in the current orthotropic steel deck bridge system. For the adequate

The inert surface of Ground Tire Rubber (GTR) particles results in its weak compatibility with asphalt matrix and thus causes serious phase separation in rubberised asphalt. Meanwhile, plasma treatment is able to modify the polymer surface effectively. This study applied cold plasma to modify the surface of GTR particles for compatibility improvement in rubberised asphalt. The surface characteristics

This study evaluates the oxidation ageing properties of asphalt blends and mixtures combined with various percentages of RAP and SBS-modified binder, rejuvenator and neat binder. Four ageing methods were conducted in the laboratory on the asphalt blends and mixtures. The results showed that the G-R parameter, the ICO and the flexibility index increased, while the ΔTcr decreased with the RAP content

Ranking of asphalt binders based on the permanent deformation characteristics of the respective mixtures is important for designing mixtures for pavements. While various tests on binders and corresponding parameters have been suggested for ranking asphalt binders, their applicability is limited since many of these parameters fail to characterise the nonlinearity in the response of asphalt binders at

Using high contents of the RAP material in newly produced asphalt mixtures leads to a reduction in the crack resistance of the mixtures. This shortcoming can be compensated using some methods such as polymer modification, rejuvenation, fibre-reinforcement, etc. In this paper, the effect of Cyclogen as a rejuvenator and glass fibre was investigated on the cracking behaviour of recycled asphalt mixtures

Performance of asphalt concrete pavement significantly degrades during the aging of asphalt binders. The master curves of complex shear modulus and phase angle are recognised as useful tools to characterise the rheological properties of aging asphalt binders. The main shortcoming of existing master curves is that the effects of aging cannot be captured and predicted effectively. This study developed

Skid resistance markedly depends upon road surface texture. That texture is composed of a range of scales each of which contributes differently to the generation of friction at the tire-road interface. This work aims to contribute to understanding the role of these different scales. The method adopted deploys a signal processing technique, termed Empirical Mode Decomposition, to decompose the texture

Low-temperature reversible aging is one of the most important forms of asphalt hardening, especially for cold regions. However, there are few researches about the influence of wax-based warm additive on the low-temperature reversible aging of asphalt, especially under non-isothermal conditioning. For this reason, simplified extended bending beam rheometer (Ex-BBR) test, non-isothermal rheological analysis

Currently, Egypt is using the [AASHTO, 1993 AASHTO, 1993. Guide for design of pavement structure. Washington, DC: American Association of State Highway and Transportation Officials. [Google Scholar]. Guide for design of pavement structures. Washington, DC: American Association of State Highway and Transportation Officials] guide for the flexible pavement structural design. In this method the resilient

The Tensile Strength Ratio (TSR) test is commonly used to quantify the moisture susceptibility of asphalt mixtures. This test method is based on the indirect tensile strength, which is not a fundamental property and hence cannot be used in the asphalt mixture design process. Therefore, alternative test methods that use a fundamental property to quantify moisture sensitivity of asphalt mixtures are

Pavement roughness is one of the essential parameters of pavement quality affecting ride quality, driving safety, and fuel consumption. The International Roughness Index has been widely deployed to evaluate pavement surface roughness. A vibration-based system is developed by using a low-cost three-axis Micro-Electro-Mechanical Systems accelerometer and a Global Positioning System sensor, which are

ABSTRACT Aged road pavements and insufficient maintenance budgets, along with increasing concerns over the environmental issues related to transportation have introduced additional challenges to highway agencies. Multiobjective optimisation techniques can be used to account for those multiple aspects in the design of maintenance and rehabilitation (M&R) strategies. Contrary to the single-objective

This study aimed to investigate the effect of multi-wheel loading gear configuration on loading-induced failure potential of airfield flexible pavements. Field response testing was conducted in the National Airport Pavement Test Facility (NAPTF) using different multi-wheel gear configurations. Three-dimensional (3-D) finite element (FE) models were developed to simulate multi-wheel loading along with

Load transfer significantly affects the performance of a concrete pavement. Poor load transfer may result in faulting, transverse cracking, and pumping, as well as reducing the service life of the pavement. Because roller-compacted concrete pavement (RCCP) is constructed without dowel bars, load transfer at its joints or cracks mainly depends on shear transfer capabilities induced by aggregate interlocks

Asphalt pavement rut influences the durability of the pavement as well as traffic safety. The influence of a flexible and a semi-rigid base on asphalt pavement rut has not been researched in detail. Using theoretical and experimental research on asphalt pavement rut, the objective of this project is to determine the differences in asphalt pavement rut for different base types and the influence of the

The working temperature of a bituminous pavement can typically range from 75 ∘C to −20∘C. Bitumen shows a wide spectrum of mechanical behaviour in this temperature range and these include those of a viscoelastic fluid, a viscoelastic solid and an elastic solid. Due to the amorphous nature of the material, the transitions between such mechanical responses are gradual. This investigation focuses on the

The available methods for accelerated ageing simulation in laboratory of compacted bituminous mixtures are often not representative of the ageing mechanisms experienced in the field. The objective of this study was to develop an alternative ageing method, Tecnico accelerated ageing (TEAGE). The method is intended to simulate the ageing of bituminous mixtures under specific environmental conditions

Pavement infrastructure is experiencing unanticipated climate conditions due to global warming. Extreme weather events, such as excessive precipitations, are increasing in intensity and frequency under climate change, which pose a flood risk to pavement infrastructure. The impact of flooding on pavements has become a rising concern since pavements are designed based on historical data, which do not

Nowadays, the increasing urbanisation and the effect of climate change in cities has been a constant concern. In particular, the floods cause a significant increase in surface runoff, mostly on roads and parking areas. As an alternative to asphalt pavements, usually used in these areas, permeable pavements have been developed with Porous Asphalt (PA). These pavements allow the infiltration of water

Snow and ice pose a significant risk for aircraft ground operation safety. Ploughing and chemical treatment are used for snow removal, but yield long-term detrimental impacts to the airfield infrastructure and environment. A proof-of-concept airfield heated pavement system (AHPS) prototype using near-surface embedded heat wire for pavement anti-icing is presented in this paper. Surface-embedded wires

In this study, laboratory and field constructed Jointed Plain Concrete Pavements (JPCP) were evaluated with Fibre Reinforced Polymer (FRP) dowels and compared with JPCP consisting of steel dowels. Laboratory evaluations on representative concrete JPCP sections with FRP and steel dowels consisted of static and fatigue testing followed by analytical modelling. Laboratory testing of JPCP with FRP and

In this study, four different additives (Styrene–butadiene–styrene (SBS), Trinidad Lake Asphalt (TLA), Iranian Gilsonite (IG) and American Gilsonite (AG)) were used in bitumen modification. The rheological properties of bitumen were improved with the additive usage, and the desired performance grade (PG 70-34) was achieved by using additives in pure bitumen (PG 58-34) at the indicated ratios. Wheel

The introduction of modified asphalt binders provided transportation agencies an effective tool to design balanced mixtures that can resist conflicting distresses while maintaining good long-term durability. While conventional polymer modified asphalt mixtures have shown improved long-term performance, it is also believed that asphalt mixtures with high polymer (HP) content may offer additional advantages

The principles of sustainability dictate that construction materials should be recycled whenever possible. In the US, it is a common practice to crush old concrete pavements at the end of their service lives into recycled concrete aggregate (RCA) for use in the base course of new pavements but not to use the RCA in the new concrete pavement layer itself. In the 1980s, a number of trial projects were

A numerical model for the temperature field calculation of high-strength concrete pavement is developed in this paper. Cement hydration, solar radiation and atmospheric temperature changes are taken into consideration in the modelling. Temperature field of high-strength concrete pavement made by concrete with a compressive strength of 100 MPa at 28 days is simulated. Using the model, effects of internal

Nowadays, probabilistic prediction models commonly represented by Markov Chain Process (MCP) attract more attention in pavement management systems. Additionally, roughness condition indices provide a broad judgment. One element that contributes the most to the roughness progression is the initial roughness of pavements which has not been considered in the prediction models developed by MCP. On the

Fatigue cracking is one of the major distresses in asphalt pavements. Engineers have used many methods, from sophisticated numerical simulations to experience-based knowledge, to address fatigue cracking and deliver pavements that perform well. One strategy that has become increasingly widespread is the use of a fatigue index parameter that identifies the cracking potential of asphalt mixtures independent

Three-dimensional Finite Element (3D-FE) stress computations involved in the current rigid airport pavement design methodology, are time consuming when considering top-down cracking failure mode. In this study, Artificial Neural Network (ANN) models are integrated into a tool called ANNFAA to replace such 3D-FE computations. ANNFAA makes use of the best ANN models developed in MATLAB for 156 different

ABSTRACT Aggregate structure plays a significant role in the pavement performance of road materials. However, there is a lack of fundamental understanding of mechanical characteristics and evolution characteristics of the aggregate structure in the existing research. To understand this complex structure, laboratory tests and numerical simulations using the discrete element method were used to investigate

One of the key parts of a pavement management system is the maintenance and rehabilitation planning. The planning is usually developed under the assumption that all parameters are known with certainty. In practice, there are various parameters afflicted with large uncertainty. Ignoring the uncertainty may lead to a suboptimal plan adversely affecting the network conditions. The objective of this study

The use of index parameters to evaluate the performance of asphalt mixtures has become an important process for making informed pavement material decisions. These index parameters are indicators of asphalt mixture performance and thus are widely used in the asphalt paving industry. This paper presents a new rutting index parameter to assess the rutting resistance of asphalt mixtures using the stress

Macro-scale fractures of asphalt mixture usually exhibit multiple failure mechanisms including aggregate cracking, interfacial debonding between bitumen and aggregate, and binder tearing; however, damage modelling through conventional continuum mechanics fails to take into consideration the effects of the small-scale physical phenomena. This study aims to introduce a micromechanical damage model for

Industrial waste is an inevitable problem that is currently endured by most of the developing countries. Waste granite dust is one among the many detrimental industrial wastes originating from the granite manufacturing. The objective of the present study is to determine the optimum percentage of waste granite dust to be adopted in the manufacturing of Interlocking Concrete Block pavers (ICBP) by replacing

During the past few decades, the engineering and geotechnical properties of recycled concrete aggregate (RCA) has been investigated to evaluate its potential to use as a road construction material. This research studied the usage of polyvinyl alcohol (PVA) and cement for improving the mechanical strengths of RCA to be used as an alternative material in pavement base/subbase applications. The results

This study evaluates the effectiveness of dust treatments on gravel roads. Two dust suppressant types: CaCl2 and MgCl2 were used in this study on 26 gravel roadway segments. Two dust measuring devices: HAZ-DUST EPAM-5000 and Colorado State University (CSU) Dustometer were used to measure the fugitive dust emissions. The variables that might have an impact on the effectiveness of dust treatments were

The ability to measure traffic-speed tire-pavement noise in the laboratory is useful for predicting the tire-pavement noise performance of a design mix without conducting expensive and time-consuming field trials. This research developed an in-door high-speed test facility HTP2 for tire-pavement noise measurements. Housed in a semi-anechoic room, HTP2 has a circular test track of vertical wall, and

Asphalt aging is recognised as one of the important factors causing cracking related failures in asphalt pavements. Asphalt aging occurs during production, construction, and service life of the asphalt surfaced pavements. Since constituents of asphalt mixtures are continuously increasing (increased recycled asphalt pavement (RAP), rejuvenators, compaction aids, warm-mix additives, fibres, etc.) and

While precast cement mortar block has often been used in modular pavement, precast HMA (Hot Mix Asphalt) block has the advantages of flexible behaviour, no curing and recycling, etc. In this project, the mechanical characteristics of the precast HMA block were evaluated by comparing with precast cement mortar block. The objective of this project was to develop a method for the design of precast HMA

Prediction of the temperature development at an early age is a good starting point to assess the development of the restrained thermal stress and thermal cracking in rigid pavements. This paper presents a numerical early age concrete pavement temperature prediction model. It enables to evaluate the effect of various paving conditions, such as paving time, curing method, air temperature, wind speed

Performance of reclaimed asphalt pavement (RAP) reinforced with Bamboo geogrid and Bamboo geocells based on laboratory model tests are presented in this paper. RAP materials are obtained as waste materials during milling and/or full depth reconstruction of bituminous pavement. Generally, very high-quality uniform RAP is used in the preparation of hot mix asphalt (HMA). RAP materials not suitable for

ABSTRACT Existing pavement management systems (PMSs) aggregate short survey sections into long homogeneous sections (typically 1–5 km), aiming to reduce the amount of data and formulate a tractable optimisation problem. However, assuming that sections in a similar condition will undergo a similar deterioration of this condition is incorrect, resulting in imprecise predictions and violations of thresholds

Final and other layers of road structures and their corresponding elements significantly affect the generation of heat islands in areas in which they are located Air temperature increases in relation to the surrounding areas during the formation of heat islands. This paper presents the results of field research which measured the temperature of all elements of two road underpasses, which are integral

Oyster farming annually generates millions of empty hard seashells as by-product waste in municipal landfills worldwide. Using this waste as fine and coarse aggregates as construction materials offers a low energy consumption alternative to recycling and mining of virgin materials. This research explores the use of seashell as a cost-effective replacement of virgin fine aggregate in hot mix asphalt

This paper presents a laboratory study aiming to characterise the influences of aggregate micro-texture on the skid resistance under consideration of different wavelengths. To achieve this objective, 11 kinds of aggregates were used to prepare aggregate specimens. Micro-Deval (MD) and Aachen Polishing Machine (APM) were utilised to represent the changes in aggregate morphology which is caused by traffic

This paper focused on predicting the performance of asphalt mixes modified with nano-montmorillonite (NMMT) and nano silicon dioxide (NSD) using the Quality-Related Specifications Software (QRSS), which is a simplification to the Pavement ME Design. The nanomaterials were thoroughly mixed with the binder at a temperature of 145 ± 5°C. The conventional and the rheological properties were determined

Reliable assessment of asphalt binder aging is important for material selection and the prediction of asphalt property changes in field pavements. The apparent property changes of asphalt binder with aging, however, are affected by aging conditions. In this study, three aging treatment methods were applied to five types of asphalt binders, and the longest aging treatment period lasted for 1.5 years

In this study, optimum bitumen content (OBC), an important parameter on Marshall Design is described with a mathematical model by using statistical design method. The effects of independent variables such as number of blows, temperature, additive rate and bitumen content are analysed. The simultaneous optimisation of the dependent variables such as practical specific gravity, voids, voids of filled

Dynamic modulus ( |E∗|) of asphalt can be estimated using predictive models to avoid the time-taking and costly laboratory-based measurements. Several predictive models such as the Witczak model have been widely used by many researchers for the prediction of the |E∗|. Previously developed models have been widely reported to either overpredict or underpredict the values of |E∗|. In this study, to overcome

Resilient moduli are widely used in mechanistic analyses to predict distresses in pavement structures. The objective of this study is to develop an in-situ modulus detector (IMD) to evaluate the resilient moduli of subgrades based on various influencing factors. The IMD consists of a tip module, a driving rod, and a hammer-drop system. In the tip module, a load cell and an accelerometer are installed