Showing papers in "Road Materials and Pavement Design in 2019"
TL;DR: In this article, a surface treatment method Abrasion and attrition (AB&AT) was employed for removing contaminants, such as dust, asphalt film and agglomerated particles.
Abstract: The presence of dust, asphalt film and agglomerated particles is considered to be the primary reason for reducing the properties of Reclaimed Asphalt Pavement (RAP)-inclusive concrete. A surface treatment method Abrasion and Attrition (AB&AT) was employed for removing these contaminants. Gaps were identified from the available literatures and efforts have been made to bridge them in order to increase the usage of RAP aggregates in concrete pavements. Six mixes were prepared by partly replacing the Natural Aggregates (NA) with RAP aggregates in different proportions. It was learnt that processing Dirty RAP (DRAP) aggregates by the AB&AT method could remove contaminants considerably as a result of which stronger bonding is exhibited at the interface of the aggregate and hydrated mortar matrix. Incorporation of beneficiated RAP aggregates in concrete improved the workability considerably but it was found to have reduced hardened concrete properties. However, the results were found to lie within the permissib...
64 citations
TL;DR: In this paper, the authors focused the attention of the society on the possible re-use of different agricultural and industrial wastes in road construction and proposed a method to deal with this problem.
Abstract: Ever-growing concern to protect the environment concentrated the attention of the society on the possible re-use of different agricultural and industrial wastes in road construction. This research ...
58 citations
TL;DR: In this paper, the strength and microstructural properties of a geopolymer stabilised soft soil (SS) using palm oil fuel ash (POFA) as a precursor were presented.
Abstract: This paper presents the strength and microstructural properties of a geopolymer stabilised soft soil (SS) using palm oil fuel ash (POFA) as a precursor. The liquid alkaline activator, L used was a mixture of sodium silicate solution (Na2SiO3) and sodium hydroxide solution (NaOH). Compressive strengths were measured to assess the viability of POFA-SS geopolymer as a stabilised subgrade. Specialised tests were undertaken on POFA-SS geopolymers to investigate the geopolymerisation mechanisms under various Na2SiO3:NaOH ratio, L content and POFA:SS ratio. These specialised tests included; X-ray diffraction, scanning electron microscope with energy dispersive X-ray spectroscopy (SEM/EDX) and Fourier transform infrared (FTIR) spectroscopy tests. The lower POFA:SS ratios required more NaOH and L to be absorbed by both external and internal negative layer surfaces of SS to develop the stabilised soil structure. The optimum Na2SiO3:NaOH ratios providing the highest strength were at 40:60, 50:50, and 60:40 for POFA:...
55 citations
TL;DR: In this article, the use of glass powder (GP) as a possible surrogate to limestone filler in recycled dens has been investigated using both bituminous mastics and mixtures tests.
Abstract: This paper presents laboratory study results, including both bituminous mastics and mixtures tests, to assess the use of glass powder (GP) as possible surrogate to limestone filler in recycled dens...
55 citations
TL;DR: In this article, the use of construction and demolition (C&D) materials with clay, and a comparative study on the C&D and natural aggregate (NA) utilisation for road pavement subgrade.
Abstract: This paper presents the use of construction and demolition (C&D) materials with clay, and a comparative study on the C&D and natural aggregate (NA) utilisation for road pavement subgrade. Californi...
49 citations
TL;DR: In this paper, the effect of lime and discrete plastic fiber on the strength and stiffness behaviour of clayey soil was investigated using a series of unconfined compressive strength (UCS), split-tensile strength (S...
Abstract: This paper studies the effect of lime and discrete plastic fibre on the strength and stiffness behaviour of clayey soil. A series of unconfined compressive strength (UCS), split-tensile strength (S...
47 citations
TL;DR: In this paper, the authors describe bitumens as complex materials, produced mainly from crude oil as a byproduct of petroleum refineries, but may also be obtained from bio-oils or solid hydrocarbons.
Abstract: Bitumens are complex materials, produced mainly from crude oil as a by-product of petroleum refineries, but may also be obtained from bio-oils or solid hydrocarbons. Bitumen specifications have bec...
47 citations
TL;DR: In this article, the effect of waste toner on fatigue resistance of asphalt binder was examined and the linear amplitude sweep test was used to evaluate the fatigue of asphalt binders.
Abstract: This paper examines the effect of waste toner on fatigue resistance of asphalt binder. Fatigue resistance of toner-modified asphalt binders was studied implementing the linear amplitude sweep test,...
38 citations
TL;DR: In this article, the storage stability of styrene-butadiene-styrene (SBS)-modified asphalt is addressed by incorporating nanoclay into SBS-modified asphalt.
Abstract: Storage stability at high temperature is one of the major concerns of styrene–butadiene–styrene (SBS)-modified asphalt. This study aims to address this concern by incorporating nanoclay into SBS-mo...
38 citations
TL;DR: A review of the literature shows that limited work has been conducted on polyethylene terephthalate (PET)-modified asphaltic materials with inconsistent results, missing the investigation of some asp... as mentioned in this paper.
Abstract: Reviewing the literature shows that limited work has been conducted on polyethylene terephthalate (PET)-modified asphaltic materials with inconsistent results, missing the investigation of some asp...
37 citations
TL;DR: In this paper, a growing need to improve the performance properties of asphalt binders in order to minimize the occurrence of failure mechanisms such as permanent deformation, fatigue, adhesiveness and m...
Abstract: There is a growing need to improve the performance properties of asphalt binders in order to minimise the occurrence of failure mechanisms such as permanent deformation, fatigue, adhesiveness and m...
TL;DR: In this paper, the effect of reclaimed asphalt pavement (RAP) on the rheological properties of a hybrid binder and the fracture properties and cracking performance of resultant mixtures was investigated.
Abstract: This study investigated the effect of reclaimed asphalt pavement (RAP) on the rheological properties of a hybrid binder and the fracture properties and cracking performance of resultant mixtures. F...
TL;DR: In this article, the authors describe the behavior of asphalt mixture compaction during compaction and show that loads in the material are mainly transferred through contact between the stones and the interaction between the stone and the binder.
Abstract: During asphalt mixture compaction, loads in the material are mainly transferred through contact between the stones and the interaction between the stones and the binder. The behaviour of such mater...
TL;DR: In this paper, the combined effect of aging temperatures and cooling medium on the rheological properties of asphalt binder was experimentally investigated and evaluated and two 70/100 penetration gra...
Abstract: In this paper, the combined effect of aging temperatures and cooling medium on the rheological properties of asphalt binder was experimentally investigated and evaluated. Two 70/100 penetration gra...
TL;DR: In this paper, the glue-sphered ellipsoid particles were used to create cylinder samples, and triaxial tests were simulated using the triaxials using the...
Abstract: In order to study the effects of aggregate shape on the strength of mixtures, the glue-sphered ellipsoid particles were used to create cylinder samples, and triaxial tests were simulated using the ...
TL;DR: In this article, self-healing asphalt by increasing bitumen temperature using microwave radiation is an effective technique for crack healing on asphalt mixtures, however, it is not suitable for road surface.
Abstract: Self-healing asphalt by increasing bitumen temperature using microwave radiation is an effective technique for crack-healing on asphalt mixtures. Normally, these types of asphalt mixtures contain m...
TL;DR: In this article, the use of traditional binders such as cement or lime has been investigated for the improvement of geotechnical properties of road surface. But, the usage of such binders implies a considerable financial and environmental cost.
Abstract: The improvement of geotechnical properties is often achieved by the addition of traditional binders, such as cement or lime. However, the use of such binders implies a considerable financial and en...
TL;DR: It was found that the variability of pavement layer thickness and stiffness has a significant impact on pavement performance and pavement condition cannot be described by the mean values of the indicators but by the probability distribution function which can describe pavement condition at any reliability level.
Abstract: Variability of pavement design parameters has always been a concern to pavement designers and highway agencies. A robust pavement design should take into account the variability of the design input...
TL;DR: Warm mix asphalt (WMA) is a high-speed emerging technology of producing asphalt mixture at lower temperature with equivalent performance of hot mix asphalt as discussed by the authors, which offers benefits such as energy saving and energy efficiency.
Abstract: Warm mix asphalt (WMA) is a high-speed emerging technology of producing asphalt mixture at lower temperature with equivalent performance of hot mix asphalt (HMA). It offers benefits such as energy ...
TL;DR: Unlike the ground transportation, the underground road or subway are directly constructed in the soft soil layer without a subgrade and foundation system to reduce the influence of traffic loading as discussed by the authors, which is called tunneling.
Abstract: Unlike the ground transportation, the underground road or subway are directly constructed in the soft soil layer without a subgrade and foundation system to reduce the influence of traffic loading....
TL;DR: Nanoclay/bitumen nanocomposites have been prepared using a commercial organically modified nanoclay (Nanomer), and two different penetration grade bitumens under a range of different blending condi...
Abstract: Nanoclay/bitumen nanocomposites have been prepared using a commercial organically modified nanoclay (Nanomer), and two different penetration grade bitumens under a range of different blending condi...
TL;DR: In this article, the authors investigated the effects of crumb crumbs on the air voids of porous asphalt (PA) pavement, which possesses frictional, environmental and safety benefits owing to its high content of VV.
Abstract: Porous asphalt (PA) pavement possesses frictional, environmental and safety benefits owing to its high content of air voids (VV). The objective of this study is to investigate the effects of crumb ...
TL;DR: In this paper, the experimental analysis of the thermal conductivity of semi-rigid asphalt pavement was performed using an experiment device. But, because of the lacking of a proper experiment device, the experimental results were limited.
Abstract: Thermal conductivity is an important feature of asphalt pavement. However, because of the lacking of a proper experiment device, the experimental analysis of the thermal conductivity of semi-rigid ...
TL;DR: In order to improve the performance of epoxy asphalt concrete (EAC), EAC modified with glass fibre (FEAC) was designed as mentioned in this paper, and the properties of EAC with glass fiber (FEA) under differe...
Abstract: In order to improve the performance of epoxy asphalt concrete (EAC), EAC modified with glass fibre (FEAC) was designed. The properties of epoxy asphalt modified with glass fibre (FEA) under differe...
TL;DR: In this article, the reuse of waste materials in asphalt mixtures has been investigated, in order to develop new sustainable solutions for the road-paving industry, such materials should improve the mechanization.
Abstract: The reuse of waste materials in asphalt mixtures has been recently investigated, in order to develop new sustainable solutions for the road-paving industry. Such materials should improve the mechan...
TL;DR: The Integrated Value Model for Structural Assessment (MIVES) incorporates the Value Function (VF) concept in an Analytic Hierarchy Process (AHP), combining both Multi-criteria Decision Making and Multi-Attribute Utility Theory.
Abstract: There are very few methods that can be used for the assessment of pavement conditions. Their application to urban networks tends to be complex, given the wide variety of urban pavement types (concr...
TL;DR: In this article, a one-third scale accelerated pavement testing device is used to simulate the cyclic traffic loading on two geometrically scaled flexible pavements representing typical collector roadways and interstate highways.
Abstract: Pavement structure typically consists of an asphalt concrete or concrete surface layer, underlying granular layers (subbase and/or base) and compacted subgrade soil layer. During wet seasons when the subgrade becomes saturated, cyclic traffic loading may result in pumping of fine particles from the subgrade up into the granular layer, which may lead to failure of the pavement. The objective of this research is to investigate occurrence of migration of fines and to determine the magnitude and rate of such migration. A one-third scale accelerated pavement testing device is utilised to simulate the cyclic traffic loading on two geometrically scaled flexible pavements representing typical collector roadways and interstate highways. The pavement sections are constructed on partially saturated aggregate subbase overlying non-plastic saturated silt as subgrade. The lab testing reveals that, under cyclic loading conditions, a considerable amount of fines migrated into the subbase. The subgrade fines migration in ...
TL;DR: In this article, the authors proposed a method to prevent the freezing and rutting of bridge deck pavement in high and low-temperature environments, such as bridge decks and road surface.
Abstract: Asphalt bridge deck pavement subjected to high- and low-temperature environments is easily damaged (e.g. freezing in the winter and rutting in the summer). To prevent the freezing and rutting of as...
TL;DR: In this paper, the effects of RAP as a constituent in RCA, on its characteristic properties as an unbound pavement material were investigated and the results showed that the presence of the RAP up to 15% was not significantly affected on the physical properties of RCA.
Abstract: The use of recycled concrete aggregates (RCAs) as an unbound pavement material is a perfect alternative to effectively manage the construction and demolition (C&D) wastes. However, the presence of constituents in RCA is led for inconsistent properties. The reclaimed asphalt pavement (RAP) material is one of the major constituents that can be mixed at the recycling process of demolished concrete. Therefore, this study aims to investigate the effects of RAP as a constituent in RCA, on its characteristic properties as an unbound pavement material. To achieve the objectives of the study, five RCA samples were produced by mixing different percentages of RAP by weight. A series of standard laboratory tests were conducted on each sample. The results were then compared with the properties of standard granular pavement materials specified by Queensland Department of Transport and Main Roads (QDTMR), Australia. The analysis depicted that the presence of RAP as a constituent in RCA up to 15% was not significantly affected on the physical properties of RCA as an unbound pavement material.
TL;DR: In this paper, the authors investigated the impact of the specimen fabrication method on the performance of asphalt mixtures and found that one of the most influential variables in determining the performance-based properties of the asphalt mixture is the fabrication method.
Abstract: One of the most influential variables in determining the performance-based properties of the asphalt mixtures is the specimen fabrication method. This study investigates the impact of specimen fabr...