Comparison of the air voids characteristics of different hot mix asphalt (HMA) mixture types

The internal structure of the hot mix asphalt (HMA) mixtures plays an important role in the response and performance of these paving mixtures. The objective of this paper is to conduct a quantitative comparison of the differences in internal structure -evaluated in terms of the air voids (AV) charac...

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Autores principales:	Alvarez-Lugo,Allex E, Carvajal-Muñoz,Juan S, Walubita,Lubinda F
Lenguaje:	English
Publicado:	Universidad de Tarapacá. 2014
Materias:	Hot mix asphalt (HMA) mixture mixture internal structure X-ray computed tomography (X ray CT air voids pavements
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-33052014000100008
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spelling	oai:scielo:S0718-330520140001000082014-09-02Comparison of the air voids characteristics of different hot mix asphalt (HMA) mixture typesAlvarez-Lugo,Allex ECarvajal-Muñoz,Juan SWalubita,Lubinda F Hot mix asphalt (HMA) mixture mixture internal structure X-ray computed tomography (X ray CT air voids pavements The internal structure of the hot mix asphalt (HMA) mixtures plays an important role in the response and performance of these paving mixtures. The objective of this paper is to conduct a quantitative comparison of the differences in internal structure -evaluated in terms of the air voids (AV) characteristics- of four HMA mixture types. Although the performance assessment of the HMA mixtures analyzed is out of the scope of this paper, the comparison conducted is useful to improve the understanding of the differences exhibited, at the macroscopic level, by different HMA mixture types. The AVcharacteristics (i.e., content, distribution, and size) were computed based on analysis of X-ray Computed Tomography images obtained from specimens compacted using the Superpave gyratory compactor (SGC). Corresponding results and analysis suggested that the mixtures studied presented irregular vertical distributions of total AV content and AV size, with a degree of heterogeneity that is mixture dependent, but not specimen dependent. Consequently, the specific laboratory procedure used to obtain SGC compacted specimens should be designed based on both the specimen height and mixture type. In addition, the comparative analysis also indicated that the mixtures considered as "difficult to handle" in the laboratory (i.e., PFC mixtures fabricated with asphalt rubber) did not exhibit the highest degree of heterogeneity in their internal structure. This conclusion suggests the need for proper handling of all types of HMA mixtures to get true replicate specimens.info:eu-repo/semantics/openAccessUniversidad de Tarapacá.Ingeniare. Revista chilena de ingeniería v.22 n.1 20142014-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-33052014000100008en10.4067/S0718-33052014000100008
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Hot mix asphalt (HMA) mixture mixture internal structure X-ray computed tomography (X ray CT air voids pavements
spellingShingle	Hot mix asphalt (HMA) mixture mixture internal structure X-ray computed tomography (X ray CT air voids pavements Alvarez-Lugo,Allex E Carvajal-Muñoz,Juan S Walubita,Lubinda F Comparison of the air voids characteristics of different hot mix asphalt (HMA) mixture types
description	The internal structure of the hot mix asphalt (HMA) mixtures plays an important role in the response and performance of these paving mixtures. The objective of this paper is to conduct a quantitative comparison of the differences in internal structure -evaluated in terms of the air voids (AV) characteristics- of four HMA mixture types. Although the performance assessment of the HMA mixtures analyzed is out of the scope of this paper, the comparison conducted is useful to improve the understanding of the differences exhibited, at the macroscopic level, by different HMA mixture types. The AVcharacteristics (i.e., content, distribution, and size) were computed based on analysis of X-ray Computed Tomography images obtained from specimens compacted using the Superpave gyratory compactor (SGC). Corresponding results and analysis suggested that the mixtures studied presented irregular vertical distributions of total AV content and AV size, with a degree of heterogeneity that is mixture dependent, but not specimen dependent. Consequently, the specific laboratory procedure used to obtain SGC compacted specimens should be designed based on both the specimen height and mixture type. In addition, the comparative analysis also indicated that the mixtures considered as "difficult to handle" in the laboratory (i.e., PFC mixtures fabricated with asphalt rubber) did not exhibit the highest degree of heterogeneity in their internal structure. This conclusion suggests the need for proper handling of all types of HMA mixtures to get true replicate specimens.
author	Alvarez-Lugo,Allex E Carvajal-Muñoz,Juan S Walubita,Lubinda F
author_facet	Alvarez-Lugo,Allex E Carvajal-Muñoz,Juan S Walubita,Lubinda F
author_sort	Alvarez-Lugo,Allex E
title	Comparison of the air voids characteristics of different hot mix asphalt (HMA) mixture types
title_short	Comparison of the air voids characteristics of different hot mix asphalt (HMA) mixture types
title_full	Comparison of the air voids characteristics of different hot mix asphalt (HMA) mixture types
title_fullStr	Comparison of the air voids characteristics of different hot mix asphalt (HMA) mixture types
title_full_unstemmed	Comparison of the air voids characteristics of different hot mix asphalt (HMA) mixture types
title_sort	comparison of the air voids characteristics of different hot mix asphalt (hma) mixture types
publisher	Universidad de Tarapacá.
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-33052014000100008
work_keys_str_mv	AT alvarezlugoallexe comparisonoftheairvoidscharacteristicsofdifferenthotmixasphalthmamixturetypes AT carvajalmunozjuans comparisonoftheairvoidscharacteristicsofdifferenthotmixasphalthmamixturetypes AT walubitalubindaf comparisonoftheairvoidscharacteristicsofdifferenthotmixasphalthmamixturetypes
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Comparison of the air voids characteristics of different hot mix asphalt (HMA) mixture types

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