Effect of temperature and air void on mixed mode fracture toughness of modified asphalt mixtures

Aliha, M.R.M.; Fazaeli, H.; Aghajani, Somayeh; Nejad, Fereidoon Moghadas

doi:10.1016/j.conbuildmat.2015.07.165

Cited by 148 publications

(51 citation statements)

References 51 publications

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“…As mentioned before, the air void content affects the behaviour of the asphalt mix. Aliha et al (11) verified that the resistance to fracture at lower temperatures may be reduced by 20% when the air void content increases from 3% to 7%. Another study by Ma et al (12) reported that the creep behaviour of a bituminous mix at 60 °C deteriorated exponentially when the air void content increased from 4% to 8%.…”

Section: Discussionmentioning

confidence: 99%

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Volumetric characteristics and compactability of asphalt rubber mixtures with organic warm mix asphalt additives

Rodríguez-Alloza

Gallego

2017

Mater. construcc.

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Warm Mix Asphalt (WMA) refers to technologies that reduce manufacturing and compaction temperatures of asphalt mixtures allowing lower energy consumption and reducing greenhouse gas emissions from asphalt plants. These benefits, combined with the effective reuse of a solid waste product, make asphalt rubber (AR) mixtures with WMA additives an excellent environmentally-friendly material for road construction. The effect of WMA additives on rubberized mixtures has not yet been established in detail and the lower mixing/compaction temperatures of these mixtures may result in insufficient compaction. In this sense, the present study uses a series of laboratory tests to evaluate the volumetric characteristics and compactability of AR mixtures with organic additives when production/compaction temperatures are decreased. The results of this study indicate that the additives selected can decrease the mixing/compaction temperatures without compromising the volumetric characteristics and compactability. RESUMEN: Características volumétricas y compactabilidad de mezclas con caucho y aditivos de mezclas semicalientes orgánicos.Las mezclas semicalientes permiten reducir las temperaturas de fabricación y compactación de las mezclas asfálticas y disminuir el consumo de energía y emisión de gases de efecto invernadero en las plantas asfálticas. Estos beneficios, junto con la reutilización efectiva de un producto de desecho, harían de las mezclas con caucho y aditivos de mezclas semicalientes un excelente material para la construcción de carreteras respetuoso con el medio ambiente. En esta investigación se estudia, a través de una serie de ensayos de laboratorio, las características volumétricas y de compactabilidad de las mezclas con caucho y aditivos orgánicos de mezclas semicalientes, ya que se desconoce el efecto de estos aditivos al disminuir las temperaturas de producción/compactación, pudiendo tener lugar una compactación insuficiente. Los resultados han indicado que los aditivos seleccionados pueden disminuir las temperaturas de producción/compactación de las mezclas sin comprometer las características volumétricas y la compactabilidad.

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Section: Discussionmentioning

confidence: 99%

“…The reduction of production/compaction temperatures could lead to inadequate volumetric properties and, in consequence, to an impoverished mechanical performance of the mixtures (11,12). If these mixtures do not perform well, there will be no long-term energy savings or environmental benefits.…”

Section: Introductionmentioning

confidence: 99%

Volumetric characteristics and compactability of asphalt rubber mixtures with organic warm mix asphalt additives

Rodríguez-Alloza

Gallego

2017

Mater. construcc.

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“…Annually, a lot of money is spent for the design, construction, maintenance and rehabilitation of roads. [7][8][9][10][11][12][13][14][15][16][17] In some of the aforementioned experimental studies, the researchers have tried to obtain the critical stress intensity factors of asphalt mixtures using the SCB specimen. [4][5][6] Cracking mostly occurs in cold climates, where asphalt behaves as a linear elastic material.…”

Section: Introductionmentioning

confidence: 99%

Heterogeneity effects on mixed‐mode I/II stress intensity factors and fracture path of laboratory asphalt mixtures in the shape of SCB specimen

Aliha

Ziari

Mojaradi

et al. 2019

Fatigue Fract Eng Mat Struct

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Edge cracked semi-circular shape specimen subjected to three point bend loading is a favourite test specimen for determining fracture toughness of asphalt mixtures. However, in the vast majority of previous experimental works, the homogeneous medium assumption has been considered for determining the stress intensity factor and geometry factors of asphalt mixtures tested with this test configuration. As a more realistic model and in order to consider the effects of heterogeneity on corresponding values of stress intensity factors, the asphalt mixture was modelled as a two-phase aggregate/mastic heterogeneous mixture and its fracture behaviour was investigated using numerical models of asymmetric semi-circular bend (ASCB) specimens. The generation and packing algorithm was employed to randomly distribute the aggregates with different shapes and sizes inside the mastic part. The effect of the mechanical properties of asphalt mixture (elastic modulus and the Poisson's ratios of aggregates and mastic), coarse aggregates distribution and crack length were studied on modes I and II geometry factors by means of extensive twodimensional finite element analyses. Moreover, the effect of the elastic modulus of asphalt mixture components was evaluated on the fracture path using the maximum tangential stress criterion. It was shown that crack tip location, elastic modulus of aggregates and mastic are the most important affecting parameters on the magnitude of modes I and II geometry factors. It was also shown that the geometry factors are not sensitive to the Poisson's ratios of aggregates and mastic. In addition, fracture cracking path is affected by the elastic modulus of the asphalt mixture components such that, depending on the difference between the stiffness of stiffer coarse aggregates and softer NOMENCLATURE: K I , K II , stress intensity factors of modes I and II; K Ic , K IIc , critical stress intensity factors of modes I and II; Y I , Y II , geometry factors of modes I and II; P, applied load; P c , critical fracture load; R, radius of the SCB specimen; t, thickness of the SCB specimen; E, Young's modulus; E agg , Young's modulus of aggregates; E mastic , Young's modulus of mastic; E interface , Young's modulus of interface; D, distribution of aggregates in the SCB sample; Xi, Yi, Cartesian coordinate of new generated aggregate; R i , radius of new generated aggregate; X j , Y j , Cartesian coordinate of generated aggregate in the previous steps; R j , radius of generated aggregate in the previous steps; a, crack length; S 1 , S 2 , bottom support distances; S 1 /R, S 2 /R, bottom support distances over the radius ratios; A ij , area of aggregate j in group i; A i max , maximum summation area of aggregates in group i; A i min , minimum summation area of aggregates in group i; SCB, semicircular bending sample; MTS, maximum tangential stress; HMA, hot mix asphalt; SIF, stress intensity factor

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“…polyethylene (PE), polypropylene (PP), ethylene-vinyl acetate (EVA), ethylene-butyl acrylate (EBA)) and thermoplastic elastomers Garcia et al, 2007;Naskar et al, 2012); but none of them were initially designed for bitumen modification. These polymers have been suggested for improving the properties of bitumen, such as higher stiffness at high temperatures, higher cracking resistance at low temperatures, better moisture resistance or longer fatigue life (Alatas et al, 2007;Gorkem & Sengoz, 2009;Tayfur et al, 2013;Naskar et al, 2010, Aliha et al, 2015. These additives improved on one hand the characteristics of bitumen and on the other hand the mechanical performances of the asphalt mix (Moreno- Navarro et al, 2015;Brovellia et al, 2015;Navarro et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Rheology investigation of waste LDPE and crumb rubber modified bitumen

Farahani¹,

Palassi²,

Galooyak³

2018

10.5267/j.esm

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In this article, waste plastics (low-density polyethylene, LDPE) and crumb rubber have been utilized to solve one of the most important environmental issues and to improve bitumen performance properties by these low cost materials. At first, modified bitumen samples were made using high shear mixer, then classic and performance tests were performed on them. It has been observed that adding low-density polyethylene and crumb rubber to the bitumen leads to improvement of classical characteristics. Then, after conducting dynamic shear rheometer test on modified bitumen samples, it was found that the sample containing 3% LDPE and 3% crumb rubber has the best performance. Conducting short-term and long-term aging experiments on samples containing 3% LDPE showed improved performance at high temperature services. After BBR test, more appropriate performance grade is observed for the sample containing 3% LDPE 3% crumb rubber.

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Effect of temperature and air void on mixed mode fracture toughness of modified asphalt mixtures

Cited by 148 publications

References 51 publications

Volumetric characteristics and compactability of asphalt rubber mixtures with organic warm mix asphalt additives

Volumetric characteristics and compactability of asphalt rubber mixtures with organic warm mix asphalt additives

Heterogeneity effects on mixed‐mode I/II stress intensity factors and fracture path of laboratory asphalt mixtures in the shape of SCB specimen

Rheology investigation of waste LDPE and crumb rubber modified bitumen

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