Optimisation of hot mix asphalt performance based on aggregate selection

Behiry, Ahmed Ebrahim Abu El-Maaty

doi:10.1080/10298436.2015.1043634

Cited by 20 publications

(2 citation statements)

References 15 publications

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“…The particle size distribution of a pavement aggregate has a significant effect on the overall performance of the pavement; therefore, local road authorities identify allowable gradation limits for pavement materials. A pavement aggregate must have a particle gradation within these set limits as aggregates with gradations beyond such limits lead to poor compaction and increased void ratios, thus having detrimental effects on both the performance and longevity of the pavement structure [39].…”

Section: Particle Size Distribution (Psd) Curvementioning

confidence: 99%

Application of Glass in Subsurface Pavement Layers: A Comprehensive Review

et al. 2021

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Glass-based goods are produced and consumed in relative abundance, making glass a material that is found in most households, thereby leading to its accumulation in alarming quantities throughout the globe and posing an environmental challenge. This being said, glass has been widely acknowledged to possess a variety of desirable physiochemical properties, making it suitable for utilisation as an engineering aggregate. The properties include its non-biodegradable nature, resistance to chemical attack, low water absorption, hydraulic conductivity, temperature-dependent ductility, alterable particle gradation, and its availability in a multitude of forms/chemical compositions. Owing to these properties, glass has been employed in a myriad of civil engineering studies and field trials to assess its efficacy as an engineering aggregate and to provide sustainable management schemes for waste glass. These studies/trials have incorporated glass in many forms, including fine recycled glass (FRG), medium recycled glass (MRG), coarse recycled glass (CRG), glass powder, glass fibres, foamed glass, and glass-based geopolymers. Although the beneficial properties of glass can be exploited in numerous engineering endeavours, this review paper focuses on the possible application of glass to subsurface layers of pavements. In turn, the current study centres on research studies/trials presenting results on the physicochemical, mechanical, and durability aspects of pavement layers (base, subbase, and subgrade) containing pure glass samples or glass as percentage replacements in materials, including but not limited to unbound granular materials (i.e., recycled concrete aggregate (RCA) and crushed rock (CR)) and clay soils. Through the knowledge compiled in this review article, it is reasonable to state that glass shows solid potential as a road pavement material.

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Section: Particle Size Distribution (Psd) Curvementioning

confidence: 99%

Application of Glass in Subsurface Pavement Layers: A Comprehensive Review

et al. 2021

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“…It is therefore of great significance to study the skid resistance characteristics of coarse aggregate and derive a PSV attenuation law to facilitate better-informed material selection for pavement design and construction and also predict the service life of aggregate materials in practical settings. Numerous research efforts have been reported on the pavement skid resistance problem; these studies investigated the influence of aggregate type [9][10][11], mineral composition [12], particle gradation [13,14], and surface morphology [15,16] on pavement skid resistance. While important advances have been made through these studies, the dynamics of PSV attenuation in coarse aggregate have rarely been reported.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Model of Polished Stone Value Attenuation in Coarse Aggregate

et al. 2020

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The polished stone value (PSV) of coarse aggregate is closely related to pavement skid resistance and traffic safety. However, the determination of the PSV of coarse aggregate is conventionally a time- and energy-intensive process. To facilitate the test process of PSV in materials selection and pavement design and for the prediction of the service life of aggregate materials in practical service, here a new mathematical model of PSV attenuation in coarse aggregate, which employs a physical polishing process analysis, is proposed. The PSVs of four types of coarse aggregates (calcined bauxite, granite, basalt, and limestone) were analyzed through a polishing experiment, and the corresponding mechanism was investigated via scanning electron microscopy analysis. The modeling results are in good agreement with experimental results. The aggregate PSV is affected by both the macrotexture and microtexture of the aggregate surface. The PSV due to the macrotexture exhibits a strong negative correlation with the Vickers hardness of the aggregates and decreases exponentially as the polishing time increases. The attenuation rate decreases as the fractal box dimension in the aggregate surface morphology increases. The primary factor influencing the macrotexture service life and the half-life is the aggregate surface morphology. The PSV due to the microtexture exhibits a strong positive correlation with the Vickers hardness of the aggregates, whereas there is a poor correlation with the aggregate surface morphology and polishing time. The proportion of the aggregate PSV due to the microtexture increases as the aggregate hardness increases. These results highlight the effectiveness of a new modeling approach that may potentially assist in predicting the anti-slip performance and durability of coarse aggregates.

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