Laboratory and Field Aging Effect on Bitumen Chemistry and Rheology in Porous Asphalt Mixture

Oxidative aging takes place in bituminous materials during the construction and service life of asphalt pavements and has a significant effect on their performance. In this study, porous asphalt cores were obtained from field test sections each year from 2014 to 2017. The evolution of the properties of the field cores and the recovered bitumen with time was investigated. Cyclic indirect tensile tests were performed to determine changes in the mechanical behavior of porous asphalt due to aging. Additionally, bitumen was extracted and recovered from 13 mm slices along the depth of the cores. The rheological and chemical properties of the recovered bitumen, as well as that of original bitumen aged in standard short- and long-term aging protocols, were investigated by means of dynamic shear rheometer and Fourier transform infrared spectrometer. The results show that the degree of aging is spatially dependent, resulting in a stiffness gradient within the asphalt layer. Moreover, the results demonstrate a weak relation between field aging and the standard laboratory aging protocols.

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Differences in the Ageing Behavior of Asphalt Pavements with Porous and Stone Mastic Asphalt Mixtures

Transportation Research Record Journal of the Transportation Research Board ◽

10.1177/03611981211032218 ◽

2021 ◽

pp. 036119812110322

Author(s):

Ruxin Jing ◽

Aikaterini Varveri ◽

Xueyan Liu ◽

Athanasios Scarpas ◽

Sandra Erkens

Keyword(s):

Asphalt Pavement ◽

Tensile Tests ◽

Asphalt Pavements ◽

Porous Asphalt ◽

Mastic Asphalt ◽

Stone Mastic Asphalt ◽

Aggregate Packing ◽

Indirect Tensile ◽

The Fourier Transform ◽

Air Void

The degradation of bituminous materials as a result of ageing has a significant effect on asphalt pavement performance. In this study, one porous asphalt (PA) section and one stone mastic asphalt (SMA) asphalt pavement section were designed and constructed in 2014 and exposed to the actual environmental condition. To study the change in the pavement’s mechanical properties, asphalt cores were collected from both test sections annually. The change in stiffness modulus was determined via cyclic indirect tensile tests. To investigate the ageing behavior across the pavement depth, the bitumen was extracted and recovered from 13 mm slices along the depths of the cores. The chemical composition and rheological properties of the field-recovered bitumen, and that of original bitumen aged in standard short- and long-term ageing protocols, were investigated by means of the Fourier Transform Infrared (FTIR) spectrometer and Dynamic Shear Rheometer. The results show that the effect of mineral aggregate packing, and therefore of air-void distribution and connectivity, on the ageing sensitivity of the pavements with time was significant, as the changes in the stiffness of the PA mixture were greater than that of SMA mixture. In addition, the results of field-recovered bitumen show that there is an ageing gradient inside the porous asphalt layer, however, the ageing of SMA mainly happens on the surface of the layer. Finally, the field-recovered and laboratory-aged bitumen results demonstrate a weak relation between field and standard laboratory ageing protocols.

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Preliminary Studies to Use Textile Fibers Obtained from Recycled Tires to Reinforce Asphalt Mixtures

Romanian Journal of Transport Infrastructure ◽

10.2478/rjti-2018-0009 ◽

2018 ◽

Vol 7 (2) ◽

pp. 14-30

Author(s):

Jorge C. Pais ◽

António Ferreira ◽

Caio Santos ◽

Paulo Pereira ◽

Davide Lo Presti

Keyword(s):

Asphalt Mixture ◽

Tensile Tests ◽

Crumb Rubber ◽

Asphalt Mixtures ◽

Asphalt Pavements ◽

Valuable Resource ◽

Scrap Tires ◽

Textile Fibers ◽

Asphalt Rubber ◽

Indirect Tensile

Abstract The use of crumb rubber in the modification of asphalt has occurred because of the problems related to disposal of scrap tires. However, the use of scrap tires in asphalt pavements, known as asphalt rubber pavements, can minimize environmental impacts and maximize conservation of natural resources. The textile fibers from recycled tires are typically disposed of in landfills or used in energetic valorization, but similar to other fibers, they can be used as a valuable resource in the reinforcement of engineering materials such as asphalt mixtures. Thus, this work aims at studying the use of textile fibers recycled from ground tires in the reinforcement of conventional asphalt mixtures. The application of textile fibers from ground tires was evaluated through laboratory tests on specimens extracted from slabs produced in the laboratory. Indirect tensile tests were performed on a series of nine asphalt mixtures with different fiber and asphalt contents and compared with a conventional mixture. The results obtained from a 50/70 pen asphalt were used to define three asphalt mixture configurations to be used with 35/50 pen asphalt. The results indicate that the textile fibers recycled from used tires can be a valuable resource in the reinforcement of asphalt mixtures.

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Investigating the Effects of Chopped Basalt Fiber on the Performance of Porous Asphalt Mixture

Advances in Materials Science and Engineering ◽

10.1155/2019/2323761 ◽

2019 ◽

Vol 2019 ◽

pp. 1-12 ◽

Cited By ~ 4

Author(s):

Sheng Wang ◽

Aihong Kang ◽

Peng Xiao ◽

Bo Li ◽

Weili Fu

Keyword(s):

Tensile Strength ◽

Fiber Length ◽

Asphalt Mixture ◽

Basalt Fiber ◽

Tensile Tests ◽

Asphalt Mixtures ◽

Basalt Fibers ◽

Strength Performance ◽

Porous Asphalt ◽

Indirect Tensile

Porous asphalt mixture is a type of asphalt mixture with good drainage. However, it has poor tensile strength performance and durability. Chopped basalt fibers (CBF) have been proved to be an effective additive to improve the mechanical and fatigue performance of asphalt mixtures, but little attention has been paid on porous asphalt mixture. This paper examined the effect of chopped basalt fibers with different lengths (nonfiber, 3 mm, 6 mm, 9 mm, and 12 mm) and contents (3% and 4%) on the performance of the porous asphalt mixture. A series of tests were conducted to figure out the optimum fiber length and content, including draindown test, cantabro abrasion test, freeze-thaw split tensile test, wheel tracking test, low-temperature cracking resistance test, and four-point bending beam test. Thereafter, indirect tensile tests at different temperatures were conducted to investigate the tensile strength properties of porous asphalt mixtures with optimum fiber length and content. Besides, the macroscopic and microscopic morphology of fracture sections of the samples after indirect tensile tests were studied by using a single-lens reflex (SLR) camera and scanning electron microscopy (SEM) so as to further explore the reinforced mechanism of chopped basalt fibers. The results show that the addition of chopped basalt fibers can generally improve the performance of porous asphalt mixture since chopped basalt fibers form a three-dimensional network structure in the porous asphalt mixture.

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Analysis of Adaptability of Porous Asphalt Mixture to Heavy-Duty Asphalt Pavements

CICTP 2020 ◽

10.1061/9780784482933.081 ◽

2020 ◽

Author(s):

Haoyang Wang

Keyword(s):

Asphalt Mixture ◽

Asphalt Pavements ◽

Heavy Duty ◽

Porous Asphalt

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Effect of aging on the physical-mechanical characteristics of an asphalt mixture with rubber

Journal of Physics Conference Series ◽

10.1088/1742-6596/2102/1/012020 ◽

2021 ◽

Vol 2102 (1) ◽

pp. 012020

Author(s):

J G Bastidas-Martínez ◽

J C Ruge ◽

R A G Zuluaga ◽

L Medina

Keyword(s):

Mechanical Characteristics ◽

Resilient Modulus ◽

Asphalt Mixture ◽

Asphalt Mixtures ◽

Asphalt Mix ◽

Aging Conditions ◽

Short And Long Term ◽

Indirect Tensile ◽

Recycled Rubber ◽

Monotonic Loads

Abstract This paper evaluated the physical-mechanical characteristics of two asphalt mixtures. One mix with conventional asphalt and the other with asphalt modified with recycled rubber grain. For this purpose, the asphalt mix designs were made by means of the Marshall methodology. Subsequently, asphalt mixtures were manufactured to analyze the action of monotonic loads (indirect tensile strength) and dynamic loads (resilient modulus). Previously, each type of asphalt mix was subjected to short- and long-term aging conditions, following Aastho guidelines. It is concluded that the incorporation of recycled rubber grain makes the changes in mechanical properties with aging not very noticeable in relation to mixtures without this material.

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A Review of Morphological and Chemical Properties of Porous Asphalt

CONSTRUCTION ◽

10.15282/construction.v1i2.6756 ◽

2021 ◽

Vol 1 (2) ◽

pp. 45-49

Author(s):

N.E. Jasni ◽

Khairil Azman Masri ◽

R.P. Jaya

Keyword(s):

Electron Microscopy ◽

Chemical Composition ◽

Asphalt Mixture ◽

Chemical Properties ◽

Fine Aggregate ◽

Air Voids ◽

Porous Asphalt ◽

X Ray ◽

Scanning Electron ◽

And Chemical Properties

Porous asphalt mixture is also known as gap graded mixture with less amount of fine aggregate has led the mixture contains high air voids, tends to make the mixture less durable and high porousity. Hence, past researchers has investigate on how to increase the strength of porous asphalt mixture by the addition of additive such as fiber and nanomaterials. The chemical and physical properties of porous asphalt mixture was highlighted in this paper to compare its structure, the bonding between the materials and its chemical composition that exist. This paper reviews on how additive affect the asphalt mixture in terms of Scanning Electron Microscopy (SEM), X-Ray Diffractions (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). These tests are selected to improve the asphalt mixture according to the morphological and chemical properties of porous asphalt. This study is expected to identify the morphological and chemical composition of the materials in asphalt mixture.

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Research of Mechanical Properties of Asphalt Pavement Materials with WMA and RAP

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.204-208.3934 ◽

2012 ◽

Vol 204-208 ◽

pp. 3934-3937 ◽

Cited By ~ 1

Author(s):

Bao Yang Yu ◽

Yu Wang ◽

Min Jiang Zhang

Keyword(s):

Mechanical Properties ◽

Tensile Strength ◽

Dynamic Modulus ◽

Asphalt Pavement ◽

Asphalt Mixture ◽

Asphalt Mixtures ◽

Indirect Tensile Strength ◽

Porous Asphalt ◽

Compaction Energy ◽

Indirect Tensile

The objectives of this paper are to characterize the mechanical properties of porous asphalt pavement mixtures containing RAP and a WMA additive using Super pave gyratory compactor and dynamic modulus testing. Four types of asphalt mixtures were evaluated in this study. This study evaluated compaction energy index, permeability, indirect tensile strength, and dynamic modulus for all types of porous asphalt mixtures. All of the asphalt mixtures meet the typical minimum coefficient of permeability in this study. In addition, only a slight decrease in was found when WMA additive was added to the porous asphalt mixture containing RAP. For indirect tensile strength testing, WMA containing RAP was found to have the highest tensile strength among all of the mixtures tested.

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The Effect of Compaction Temperatures and Numbers on the Air Void Level of Porous Asphalt Pavements

10.52460/issc.2021.014 ◽

2021 ◽

Author(s):

Ahmet Buğra İbiş ◽

Burak Şengöz ◽

Ali Topal ◽

Derya Kaya Özdemir

Keyword(s):

Heavy Traffic ◽

Experimental Studies ◽

Asphalt Mixture ◽

Hollow Structure ◽

Asphalt Pavements ◽

Void Content ◽

Porous Asphalt ◽

Compaction Energy ◽

Air Void ◽

Air Void Content

Porous asphalt pavement is defined as an asphalt concrete that is designed with open gradation aggregate which helps in removing the water with an air void content of about 20% by creating drainage channels. Open gradation consists of large amounts of coarse aggregates and small amounts of fine aggregates. The water is drained due to this hollow structure, this air void content in the porous asphalt mixture which inevitably decreases with time is the main parameter affecting the service life as well as the structural and functional performance. Moreover, the reduction in air void content is one of the main reasons for the loss of permeability in porous asphalt pavements and this lead to the increase in pavement density under heavy traffic conditions. Each country has its own technical asphalt specification involving the required compaction energy and temperature. This study involves the effect of compaction temperatures and numbers on the air void in porous asphalt pavements prepared with 50/70 penetration grade bitumen. As a result of experimental studies, it has been observed that the reduced compaction temperature and the number of compaction (energy) increase the air void level in porous asphalt pavements.

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