Flat and Elongated Aggregates in Superpave Regime

Oduroh, Paul K.; Mahboub, Kamyar C.; Anderson, R M

doi:10.1061/(asce)0899-1561(2000)12:2(124)

Cited by 29 publications

(21 citation statements)

References 2 publications

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“…Ishai & Gellber (1982) observed a significant increase in the stability of the mixture with an increasing irregularity of aggregates, similar to the one obtained by Oduroh et al (2000), who concluded that increased crushed particles in the mixture have a significant effect in the resistance to permanent deformation, showing that a higher percentage of crushed particles leads to a higher resistance to permanent deformation. Moreno and Rubio (2013) also concluded that the nature of coarse aggregate has an important effect in the fatigue-cracking life in asphalt mixes and should be considered in mix design.…”

Section: Introductionmentioning

confidence: 48%

Evaluation of the durability of asphalt mixtures depending on the physical properties of aggregates

Vidal

Calabi-Floody

Sánchez-Alonso

2017

rdlc

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This study aims to assess the durability of asphalt mixtures through their performance versus damage by aging and water sensibility, depending on the physical properties of aggregates. Twelve types of asphalt mixtures were analyzed, using 3 types of aggregates (different shape and mineralogy), and 4 types of asphalt binders (2 conventional, 1 high modulus and 1 modified). The characterization of the aggregates is carried out following the protocol proposed by Zingg and the particle index (PI) according to ASTM-D3398. Both parameters have been correlated with the performance of the aggregate in the mixture. The performance of the mixtures is analyzed by the parameters of FENIX test, such as peak tensile load, stiffness rate and deformation capacity in 3 aging conditions and under wet conditions. The water sensitivity was also evaluated according to the UNE-EN12697-12. The results show that the physical characterization of the aggregates through Zingg method is not enough to predict the behavior of the mixtures studied because it considers only the coarse fraction. In turn, the results show that the angularity and surface texture of the fine fraction aggregates, analyzed through the PI parameter, has a significant effect on the performance versus moisture damage and aging of the asphalt mixtures tested.Key words: Aggregates, physical properties, durability, asphalt mixtures, aging, moisture. ResumenEste estudio propone evaluar la durabilidad de mezclas asfálticas respecto de su desempeño frente al daño por envejecimiento y susceptibilidad al agua, en función de las propiedades físicas de los áridos. Se evaluaron 12 mezclas asfálticas, empleando 3 tipos de áridos (diferente forma y mineralogía), y 4 tipos de asfaltos (2 convencionales, 1 de alto módulo y 1 modificado con polímeros). La caracterización de los áridos se realiza siguiendo el protocolo propuesto por Zingg y de acuerdo al Índice de Partícula (PI) según el protocolo ASTM-D3398, parámetros que han sido correlacionados con el desempeño del árido en la mezcla. La evaluación del desempeño de las mezclas se hace a través del ensayo FENIX analizando parámetros como la carga máxima a tracción, el índice de rigidez y la capacidad de deformación; en 3 condiciones de envejecimiento y un tratamiento de inmersión. Se analizó también la sensibilidad al agua según la norma UNE-EN12697-12. Los resultados muestran que la caracterización física de los áridos por el método Zingg no es suficiente para predecir el comportamiento de las mezclas estudiadas, ya que considera sólo la fracción gruesa. A su vez, este estudio se observó que la angularidad y textura superficial de la fracción fina de los áridos, analizada a través del parámetro PI, tiene un efecto importante en el desempeño frente al daño por humedad y al envejecimiento de las mezclas evaluadas.

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Section: Introductionmentioning

confidence: 48%

Evaluation of the durability of asphalt mixtures depending on the physical properties of aggregates

Vidal

Calabi-Floody

Sánchez-Alonso

2017

rdlc

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“…Since the coarse aggregate properties are identified by current research as the second most important parameter after gradation for the performance of HMA [49], therefore, in this research, attempts were made to assess the properties of RCA for use in asphalt mixture as coarse aggregate, and this paper presented the summary results of a comprehensive set of preliminary tests on RCA, RAP and basalt as well as different mixes of these aggregates to evaluate their basic mechanical and physical properties. It was argued that information on these fundamental properties were paramount in designing a durable and sustainable asphalt mixtures.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Mechanical Properties of Recycled Material for Utilization in Asphalt Mixtures

et al. 2017

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Abstract:With an expanding world, the demand for extensive road networks is increasing. As natural resources become scarce, the necessity of finding alternative resources has led to the idea of applying recycled material to pavement construction including asphalt pavements. Amongst all asphalt components, aggregate constitutes the largest part of asphalt mixtures. Therefore, the utilization of recycled material for aggregate will represent an important opportunity to save virgin material and divert material away from landfills. Because of the large amount of construction waste generation around the world, using recycled construction aggregate (RCA) in asphalt mixtures appears to be an effective utilization of RCA. However, as aggregate plays an important role in the final performance of the asphalt mixture, an understanding of their properties is essential in designing an asphalt mixture. Therefore, in this research, the properties of RCA have been evaluated through laboratory investigations. Based on the test results, it is required that combination of RCA with some other targeted waste materials be considered in asphalt mixture. This paper presents the results of an experimental study to evaluate the RCA properties as an alternative for virgin aggregate in asphalt mixture under different percentages and combination with other aggregates, such as reclaimed asphalt pavement (RAP) and basalt.

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“…Surface textures are typically classified as either rough or smooth and will influence the tenacity with which the cement paste adheres to the coarse aggregate. Aggregates with rough surface texture bond more firmly with cement paste than relatively smooth rounded materials [3]. While these characteristics are important for a quality concrete mixture, it should be noted that good adhesion properties are primarily associated with a certain grade of aggregates [3].…”

Section: Surface Texturementioning

confidence: 99%

“…Mechanically ground by machines, crushed aggregates from the parent rock on the other hand are commonly angular in shape and have a rough surface texture. The shape of the aggregate usually affects both the strength and workability of concrete [3].…”

Section: Shapementioning

confidence: 99%

An Examination of the Physio-mechanical Properties of Rock Lump and Aggregates in Three Leading Quarry Sites Near Accra

Buertey¹,

Atsrim²,

Offei³

2016

AJCE

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Abstract:In recent times, there has been an increasing indiscrimination in the choice of aggregate for the casting of concrete in the construction industry. The nearest available material is used without looking into its properties and strength. The source of aggregates and its physio-mechanical properties have an effect on the final product depending on the design mix. This study focusses on the determination of dry density, water content of rock materials, porosity, compressive strength of parent rock lumps material, rock aggregates and the grading of aggregates. Samples were picked from three leading quarries near Accra, Ghana and were tested quantitatively at the laboratory. Analysis shows that air spaces in rock lump samples with valued percentages varied from 29% to 34% and 41% for igneous, sedimentary and metamorphic rocks respectively, with a direct proportional effect on the water content of the rock lump. Invariably, the dry density for sampled igneous, sedimentary and metamorphic rocks lump varied from 1.12g/cm 3 to 1.57g/cm 3 and 2.03g/cm 3 respectively. There was a direct correlation between the impact resistance and load resistance results of the samples. Igneous rock recorded the highest impact resistance of 802 mm followed by sedimentary and then metamorphic rocks with 602mm and 201mm respectively with a corresponding load resistance of 57kn, 29kn and 13kn. The studies revealed rock aggregate moisture contents as 8.1%, 7.6% and 10.7% translating into its water absorption and porosity of 10.25%, 14.11% and 7.55% for igneous, sedimentary and metamorphic rocks respectively. The laboratory results with respect to grading of the aggregates for particle size distribution shows that sedimentary crush rocks showed a well graded particle size distribution, best suited for concrete works. Based on comparative laboratory analysis of the physio-mechanical properties of the three rocks, igneous rocks showed properties best suited for concrete mix design, whilst metamorphic rock samples proved to be the poorest.

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Flat and Elongated Aggregates in Superpave Regime

Cited by 29 publications

References 2 publications

Evaluation of the durability of asphalt mixtures depending on the physical properties of aggregates

Evaluation of the durability of asphalt mixtures depending on the physical properties of aggregates

Evaluation of Mechanical Properties of Recycled Material for Utilization in Asphalt Mixtures

An Examination of the Physio-mechanical Properties of Rock Lump and Aggregates in Three Leading Quarry Sites Near Accra

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