The assessment of the aggregate suitability for concrete pavements applies mainly to coarse aggregate. However, even fine aggregate can significantly affect the long-term durability of concrete when it is susceptible to alkali-silica reaction (ASR). The sustainable use of available fine aggregates for the production of concrete, while reducing the effects of ASR, requires special preventive measures

In terms of longer hardening time of emulsified asphalt seal mixture, a rapid hardening seal mixture was prepared by adding cement and carbon fibre to the Styrene–Butadiene-Rubber (SBR)-modified emulsified asphalt. The mix proportion of mixture was determined by testing the mixable time, consistency, wet track abrasion value, adhered sand content, cohesion force and the cracking rate. The microscopic

Fibres are added to asphalt surface mixes mainly due to technological reasons. The impact of loose glass fibre reinforcement on the performance characteristics of different asphalt mixes was investigated. On the one hand, the glass fibres were used at Stone Mastic Asphalts as a replacement for cellulose fibres. On the other hand, glass fibres were used as additives for asphalt concrete mixes. A constant

Applications of non-destructive testing devices such as Falling Weight Deflectometer (FWD) provide crucial estimates of pavement health that assist in the optimisation of pavement management systems. However, regularly conducting these tests at a network level and post-processing of the collected data is cumbersome, which requires technical expertise, significant time, funds, and other resources. Due

Thirteen hot asphalt mixtures were tested for fatigue in four-point beam configuration. Theresults were analysed using the MEPDG fatigue model and a modified version of it, which included binders’ thermal susceptibility as an additional forecasting variable. Seven mixtures were dense-graded, three were stone mastic asphalts and three were semi-open. Three mixtures used unmodified asphalt binders UB

Extensive laboratory performance testing and advanced statistical analyses led to the determination of a fatigue-based structural layer coefficient of 0.54 for high polymer-modified (HP) asphalt concrete (AC) mixtures in new pavements. The objective of this paper was to verify, using mechanistic-empirical (ME) analyses, the structural capacity of HP AC pavement sections designed using the 0.54 layer

The present research focused on the effect of freeze-thaw cycles on behaviour of roller-compacted concrete pavement (RCCP) reinforced with recycled polypropylene fibres. RCCP specimens were designed with dry aggregates, four water to cement ratios of 0.3, 0.4, 0.5 and 0.6 and four fibre dosages of 0, 1, 3 and 5 kg/m3. Experiments were performed before and after exposure to freeze-thaw cycles in the

This study investigated the effect of nano montmorillonite at different damage degree on the multiple self-healing properties of asphalt mixture by semicircular bending (SCB) test. Four kinds of asphalt binder were used to prepare the asphalt mixture. The cumulative fatigue life was measured and the multiple healing index (MHI) was proposed as an index to evaluate the multiple healing. The test results

The bonding of asphalt and aggregate is critical especially for permeable asphalt concrete (AC) pavement and ultra-thin overlay to avoid the ravelling. High viscosity asphalt (HVA) is desirable to provide firm bonding, thereby being commonly employed both for permeable AC pavement and ultra-thin overlay. Different from the traditional hot mix asphalt (HMA) which requires significant energy consumption

(2020). Correction. Road Materials and Pavement Design. Ahead of Print.

This project tested eight commonly used mixtures in Switzerland: three surface courses, three binder courses and two base courses. Three types of test methods for stiffness modulus EN 12697–26 and fatigue resistance EN 12697-24 were used: Namely, four Point Bending with prismatic sample (4PB-PR), Indirect Tensile test on cylindrical samples with pulse load form (IT-CY) and cyclic load form (CIT-CY)

Quality construction control requires ensuring that compacted fills are properly placed without any significant delay between mixing and compaction of the wet soil mixture. When chemical treatment is resorted to meet the shortcomings in the use of locally available materials, the delay in compaction (time elapsed between mixing and compaction of the wet soil mixture) plays a significant role as it

Utilisation of recycled construction and demolition waste (CDW) within pavements is a beneficial substitution technique towards sustainability. Following this approach, this research investigates the feasibility of using waste ceramic powder as an alternative filler in mastics. To evaluate the performance of the alternative ceramic filler, its physical and chemical properties were compared to a commonly

The present study explores the use of nano Al2O3 as a potential asphalt binder modifier. The study investigates the effects of different concentrations (0%,0.5%,1% and 2% by weight of the asphalt binder) of nano Al2O3 on various properties of the asphalt binders. XRD analysis is used to study the amorphous/crystalline nature of the base asphalt binder and nano Al2O3 modified asphalt binder. The influence

This study presents the results of a systematic investigation on enhancing the shear strength and bearing capacity of subgrade fill by blending the completely weathered phyllite (CWP) with locally won red clay at varying blending ratios. Many CWP soil samples were prepared at varying bended ratios for carrying out a compaction test, micro-penetration test and direct shear test. The effects of the red

Pavement demolition debris is one of the world’s major waste problems. Each year the United States produces about 100 million tons of reclaimed asphalt pavement (RAP), out of which more than 60% ends up in landfills or asphalt plants. Recent studies have shown that RAP can be considered a viable alternative to natural base course aggregates to resolve the problem of waste accumulation. In this study

The influence of different aggregate skeleton matrices, as well volumetric composition and mixture stiffness, on the resistance of SMA to permanent deformation was assessed. Nine SMA with different optimised aggregate skeleton matrices, studied elsewhere, were now evaluated to permanent deformation with wheel tracking. The results were statistically analysed concerning relationship with specimens’

Knowing the maximum safe driving speed on a pavement curve under wet condition is crucial in achieving safe driving in wet weather. This information is valuable for pavement engineers in paving materials selection, mix design, drainage design and pavement maintenance treatment design to meet the skid resistance requirements for the safe driving speed. Unfortunately, due to the complex variables involved

A three-dimensional finite element (3-D FE) modelling was conducted based on non-uniform distributed tire-pavement contact pressure, full interfacial layer bonding conditions, and viscoelastic characterisation of the asphalt layers. In general, high temperatures were observed to be beneficial to the bottom of the asphalt layer – both the tensile and shear stresses decreased as the temperature was increased

The current research is conducted to assess the effects of Nano-Al2O3-particles on the storage stability and high-temperature performance of polymer-modified bitumen (PMB). Nano-Al2O3-particles were mixed with PMB in five different contents. The high-temperature performance of obtained bitumen was evaluated by using the storage stability, viscosity and MSCR tests. The results of tests showed that

Dredged sediments excavated or removed from reservoirs are classified as waste materials. The reuse of dredged sediments as road materials is an interesting solution to environmental problems. However, only the compaction technique without treatment by admixtures is insufficient to improve the strength and stiffness of the dredged sediments for use as standard road materials. This research presents

To recycle reclaimed asphalt pavement (RAP) derived from porous asphalt (PA) surfacing into a new PA mix, a fundamental understanding of RAP binder properties is needed. In this paper, properties of two PA RAP binders, with and without rejuvenation, were evaluated using quantitative nanomechanical atomic force microscopy (QNM AFM) and performance grading (PG) testing. A model that describes the effect

Automobile exhaust gas discharged into the air not only pollutes the environment but also seriously harms human health. Although pure nano-TiO2 has a purified effect on exhaust gas, it has a wide band-gap, a narrow response range of visible light, and is prone to agglomerate, leading to the lower catalytic efficiency. In this study, Fe3+ doping and activated carbon loading were used to compositely

Asphalt pavement is inevitably exposed to sunlight and different water environment during the service life, and the environment changes have caused the asphalt to be aged under the more complex environment such as more severe ultraviolet (UV) radiations, acid rain, or deicing salt conditions, however, the ageing mechanism and impact of coupled water and UV radiation is still not clear. In order to

This study aims to (1) determine an optimum amount of Reclaimed Asphalt Pavement (RAP) such that its addition does not adversely impact the fracture resistance of asphalt mixtures, and (2) determine the amount of RAP binder that is active in the total mix. For this purpose, the asphalt mixtures containing three RAP contents (15, 25 and 35%) and their recovered binders were characterized. The binders

Resilient modulus (MR) is one of the key properties used to characterise and quantify the mechanical behaviour of soil materials for pavement design purposes. Standard MR test procedures are often complex, lengthy, and cost-prohibitive for most routine daily applications. Therefore, correlative models relating to easy-to-obtain basic soil index properties, such as the Atterberg limits, have been historically

Tyre/road noise is the main source of excessive noise from road traffic. This problem applies to both cement and asphalt pavements. This paper presents the results noisiness evaluation of exposed aggregate cement concrete (EACC) in comparison to portland cement concrete (PCC) textured by other methods and SMA asphalt pavement. Studies conducted in Poland, have shown that EACC8 is characterised by a

This contribution is about predicting maintenance alerts in roads and selecting the most appropriate type of interventions recommended for preventing the occurrence of future failures. The objective is aligned with that covered by pavement maintenance decision support systems (PMDSS), though the methodology presented can be applied to other non-pavement road linear assets. The purpose is to summarise

Implementation of the trending mechanistic-empirical pavement design guide for resilient modulus ( Mr) estimation, often requires the use of models. The present study proposes a multimodel approach for model performance assessment amongst various stress-based models, in order to identify the existence of a confidence set of models. The multimodel approach involves the use of Akaike information criterion

The horizontal tensile strain at the top of asphalt concrete (AC) layer is considered as the most appropriate response of pavement for analysing Top-down cracking (TDC). In this study, influence of vehicle speed, temperature and non-uniform aging modulus on TDC are explored according to tensile strain magnitudes at the pavement surface. Utilizing a new analysis approach, the responses are computed

Cold in-place recycling (CIR) is a pavement rehabilitation treatment which has shown promise in terms of environmental benefits, cost savings, and successful performance. Current procedures for asphalt emulsion CIR mix design, AASHTO PP86 and AASHTO MP31, address mixture proportion selection and final performance prediction but do not consider performance of the material during the construction process

For road construction on sulfate (saline) soil, whether cement stabilisation could be effectively used must be determined. This study improves understanding of strength reduction characteristics for cement-stabilised sulfate soil subjected to variations in water content, cement content, and curing time. A series of laboratory tests to examine soil properties and compressive strength characteristics

In this paper, the effectiveness of the group method of data handling (GMDH) and the adaptive neuro-fuzzy inference system (ANFIS) methods in modelling the fracture parameters of asphalt mixtures were studied. For this aim, the models were investigated on the fracture energy and J-integral results of hot mix asphalt in terms of temperature, RAP content and fibre content. It was found that the fibres

One of the main types of distress observed in Asphalt Concrete (AC) overlays is reflective cracking, and a reflective cracking model has been recently incorporated into the latest released version of AASHTOWare Pavement ME Design (PMED) software. This study documents the complete results of the sensitivity with respect to the design inputs and material properties of reflective cracking distress predicted

The methodology behind the current mechanistic-empirical design of jointed concrete pavements (JCP) is not very sensitive to the properties of the foundation layers of a pavement system. For this reason, it is essential to develop an analysis tool that is capable of accurately capturing the influence of these supporting layers. To address the limitations of utilising simplified models for the prediction

The objective of this study was to investigate the rheological and chemical properties of crumb rubber modified asphalt binder. Reacted and activated rubber (RAR) with different rubber contents were used to modify the asphalt binder, including 15%, 25%, 30%, 35% and 40% by mass of RAR modified asphalt binder. In general, the test results were favourable in rutting resistance performance, fatigue cracking

The study examined the use of two different types of glass fibres – Alkali Resistant (AR) Glass Fibre and Electronic Grade (E) Glass Fibre as reinforcement in soils to improve its strength. Glass fibre reinforcement causes a marginal change in the plastic nature and compaction behaviour of the reinforced soil. Also, the addition of fibres renders the soil less sensitive to moisture changes. Fibre inclusion

This study aimed to establish the chemical-rheological property relationships of asphalt binders subjected to oxidative aging. Five asphalt binders were aged in the oven at several different temperatures for various durations. The chemical characteristic in terms of carbonyl index and rheological characteristic in terms of complex shear modulus and phase angle. The aged asphalt binders were measured

The objectives of this study are to investigate the performance of recycled cement-stabilized macadam (i.e., open-graded cement-stabilized macadam containing recycled aggregates, RCSM) and to develop two surface treatment approaches for the enhancement of RCSMs. The unconfined compressive test, indirect tensile test, compressive resilience modulus test, and drying shrinkage test were applied to evaluate

Application of recycled concrete aggregates (RCA) and crushed bricks (CB) into pavement materials is an ideal waste management solution. By appropriate material design, the RCA and CB could be used in permeable concrete as the pavement base which meets the principle of ‘sponge city’. This study aims to evaluate the performance of cement treated permeable concrete containing RCA and CB as the road base

This study presents two approaches for evaluating damage and recovery characteristics of asphalt mixtures. The first approach focuses on determining damage by extracting recoverable viscoelastic strain that has no damage and comparing it with the strain response of a material that has damage. The second approach is based on identifying the capacity of asphalt mixtures to recover some of the damage

Ethylene–propylene–diene–monomer (EPDM) is a high-quality synthetic rubber widely used in non-tyre automotive parts. Waste EPDM rubber is generated at several industries, manufacturing units, and automobile repair/service stations. The present study aims at the evaluation of asphalt binders and mixes with waste EPDM as a modifier. Modification was attempted with four EPDM contents (2%, 4%, 6% and 8%

In recent years, there has been renewed interest in developing Moving Measurement Platforms (MMPs) to replace the Falling Weight Deflectometer (FWD) which currently serves as the industry standard for project-level pavement evaluation. The purpose of this study was to contribute to the transition efforts from FWD to MMPs. While focusing on a new MMP device (called Raptor) based on line profile sensing

Over the last few years, several researchers have employed computational methods to model and investigate the overall behaviour of asphalt mixture composites and different factors that influence this behaviour. Two-dimensional models, particularly those with computationally generated geometries, are commonly used in lieu of three-dimensional models due to their computational efficiency. When building

The chemical compositions of asphalt and mineral type are always related to interface adhesion performance, and further affect the field performance of asphalt mixture. This study aims to evaluate the effects of mineral type as well as bitumen types experiencing different ageing process on the adhesion property of interface. Adhesion energy and adhesion work of different bitumen and mineral combinations

The influence of the addition of Crumb Rubber (CR) by dry process on the tridimensional linear viscoelastic properties of bituminous mixtures was studied. Advanced complex modulus tests were performed on two bituminous mixtures: a classical one used as reference material and a similar bituminous mixture with 3% of CR (in the mass of the mixture). CR with a continuous 3/6 mm grain size distribution

In this work, the effect of ultraviolet (UV) radiation on samples of asphalt binder mixed with crumb rubber is studied. Two sets of samples are characterised using a PG 64-22 neat binder with different percentages of rubber particles being 0, 16.6, and 20.0 wt.%. One set of the samples was stored at ambient temperature (called the unaged set) and the other was inserted inside an accelerated weathering

Three-dimensional (3D) parameters are being increasingly used to characterise the pavement macrotexture. This study explores the influence of the evaluation area and sampling interval on the 3D macrotexture parameters. The point clouds of surfaces with different morphologies are captured by a 3D scanner, and is divided into non-overlapping rectangular areas with different sizes. The original point

In order to compare some innovative solutions of sustainable pavement surfaces containing crumb rubber modifier (CRM), a strengths, weaknesses, opportunities, and threats (SWOT) analysis of different technologies developed for production of low noise pavements (LNPs) has been carried out. CRM is one of the by-products obtained from end-of-life tyres (EOLT) that is currently recycled in asphalt pavements

Traffic loading has been associated with different main distresses occurring in the pavements. Fatigue cracking and rutting can be considered as the main distresses occurring in the pavement structure. Studies conducted in the past have shown improved mechanical performance of asphalt rubber mixtures, but only few of these studies are inclined in investigating the long-term mechanistic performance

Road traffic noise is the most common source of environmental pollution in urban areas, and therefore, the study of noise mitigation actions is fundamental for urban planning. The use of low noise road surfaces is one of the most widespread intervention since it acts directly on the source of road traffic noise, represented by tyre/road interaction. In this work, the interaction between texture and

This study investigated traditional and new approaches for predicting airfield pavement responses from surface deflections measured under Heavy Weight Deflectometer (HWD) testing conducted at National Airport Pavement Testing Facility (NAPTF). In the traditional approach, pavement layer moduli were backcalculated and then pavement responses were predicted based on the multilayer elastic (MLE) theory

The amount of produced asphalt mixtures incorporating reclaimed asphalt has been steadily increasing in the past years and so has the use of recycling agents. Some countries in Europe and elsewhere have already come into contact with repeatedly recycled materials. This study, therefore, investigated the influence of long-term ageing on multiple recycled binder blends and thereby simulated a repeated

The present investigation aimed at evaluating the permanent deformation responses of bitumens modified with low-density polyethylene - either with or without polyphosphoric acid (bitumen+PE and bitumen+PE+PPA) - and by considering bitumen tests (MSCR – multiple stress creep and recovery), rheological models and asphalt tests (FN – flow number). The formulations were graded as PG 76-xx and the standardised

Performance-based mixture tests were used to design 100% recycled mixtures while verifying the potential to use the test methods for routine design of highly recycled asphalt mixtures. Two different gradations of recycled mixtures were prepared, each with two different binder contents and a polymer modified bitumen for one of the mixtures. A bio-based rejuvenator was always applied to ensure the targeted

Different materials and compounds were used for improving mechanical and rheological properties of bitumen. Replacing the traditional bitumen by emulsion bitumen is increasing due to reduced environmental pollution. In recent years, emulsion bitumen modification has been considered to obtain higher efficiency bitumen with water-dispersible polymers. For this purpose, this study intends to investigate

This study developed discrete element models to simulate the dynamic repetitive load test using precision unbound material analyzer (PUMA). The simulated aggregate was created with the clump method simulating real particle shape. The parameters of the real particle shape were determined by the smoothness degree of particle shape and the required time-steps, which balanced the accuracy of particle shape

With the increase of solid wastes, officials in Ras Al Khaimah (RAK), United Arab Emirates (UAE) are evaluating reuses of these materials rather than being dumped in landfills. Furthermore, asphalt pavements in RAK are failing prematurely due to heavy and slow traffic accompanied with high temperatures during the summer. To assist in the efforts of solving these problems, this study was conducted to

Cement Grouted Bituminous Mix (CGBM) is a composite material, in which air voids present in the bituminous mix are grouted with a cementitious material. The main aim of this study is to develop and evaluate CGBM in the laboratory and field. A conventional dense graded Bituminous Concrete (BC) mix is also considered for comparison. This paper presents the details of different investigations carried

The forest road pavements ensure the transportation of wood from the primary platform to the public road. The traffic has seen a rapid development in terms of transportation capacity. Thus, the forest road pavements are subjected to increasing traffic pressures. To respond, the researchers come up with the optimisation of the road pavement by using geogrids. The main purpose of this study is to present