Fatigue Life Assessment of Modified Asphalt Concrete

Sarsam, Saad Issa; Al-Lamy, A.

doi:10.12983/ijsrk-2015-p0030-0041

Cited by 16 publications

(16 citation statements)

References 9 publications

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“…On the other hand, when the strain level decline from 250 to 400 and 750, the fatigue life declines by (83.2, and 96.5), (75.2, and 96.6), (72.3, and 97) for control, modified mixture with 2 % silica fumes and modified mixture with 4 % fly ash respectively. Such behavior agrees well with Sarsam and AL-Lamy,[12].…”

supporting

confidence: 88%

“…The optimum percentages of fly ash and Silica fumes are (4 and 2) % by weight of binder respectively. Details of the mixing procedure and selection of the optimum percentages could be found in Sarsam and Al-Lamy, [12].…”

Section: Preparation Of Modified Asphalt Cementmentioning

confidence: 99%

“…The stiffness is susceptible to the testing temperature and asphalt content, lower testing temperature of 5º C exhibits higher stiffness value, while higher binder content has a negative impact on the stiffness. Sarsam and AL-Lamy, [12] revealed that the Fatigue life of asphalt concrete increased with the use of silica fumes and fly ash by (50% and 111%) and stiffness increased by (124% and 155%), respectively, as compared with conventional mix. Estimation of fatigue lives of bituminous mixtures using artificial neural networks was conducted by Tapkin, [13].…”

Section: Introductionmentioning

confidence: 99%

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Assessment of Fatigue Life and Stiffness of Asphalt Concrete After Implementation of Additives

Sarsam¹

2021

CEBEL

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Modifying asphalt binder with additives can enhance the overall physical properties of asphalt concrete. In the present investigation, an attempt has been made to use 2 % of silica fumes and 4 % of fly ash class F for modification of asphalt binder in wet process. Asphalt concrete wearing course slab samples have been prepared under roller compaction. The beam specimens of 400 mm length and 50 mm height and 63 mm width were extracted from the slab samples. The beam specimens were subjected to the four-point repeated flexural bending beam test. The flexural stiffness was calculated under three constant micro strain levels of (250, 400, and 750). The fatigue life was monitored in terms the number of load repetitions to reach the required reduction in stiffness of 50 %. It was concluded that the flexural stiffness increases by (11, and 15) %, (17.7, and 63.6) %, (57.2, and 65) % when 2% of silica fumes or 4 % of fly ash are implemented and the specimen’s practices 750, 400, and 250 micro strain levels respectively. However, the fatigue life increases by (40, and 72.8) %, (115, and 220.6) %, (46, and 94.6) % when 2% of silica fumes or 4 % of fly ash are implemented and the specimen’s practices 750, 400, and 250 micro strain levels respectively. It is recommended to use modified binder with silica fumes and fly ash in asphalt concrete to enhance the fatigue life and stiffness.

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confidence: 88%

Section: Preparation Of Modified Asphalt Cementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Assessment of Fatigue Life and Stiffness of Asphalt Concrete After Implementation of Additives

Sarsam¹

2021

CEBEL

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“…Generally, higher resilient modulus indicates greater resistance to deformation, while the higher resilient deformation indicates more flexibility of the pavement. Resilient modulus can be determined at moderate temperature of 25°C and stress level of (138Kpa), [2]. Additives and modifiers such as liquid anti-strip (LAS), styrene butadiene styrene (SBS), poly phosphoric acid (PPA), and hydrated lime have been investigated by [3] to evaluate the influence of polymer modified bitumen in pavements.…”

Section: Introductionmentioning

confidence: 99%

Resilient Behavior of Modified Asphalt Concrete Mixture

Sarsam¹

2018

AJTTE

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Asphalt concrete pavement is designed to exhibit elastic behavior under loading at cold weather condition and a combination of elastic, plastic and viscous behavior at hot weather condition. Distress of the pavement usually starts with initiation of micro cracking due to load repetition, while such cracks can heal by themselves in slow process under repeated loading, external or internal heating, and provision of rest period at ambient temperature. The aim of this work was to assess the resilient behavior of modified asphalt concrete using three types of polymer additives such as starien-butadien-stairen (SBS), low density poluetheline (LDPE), and scrap tire rubber. Beam specimens of 381.0 mm length, 76.2 mm width, and 76.2mm thickness have been prepared with optimum asphalt content requirement and with extra 0.5% asphalt above and below the optimum. Beam specimens were tested under repeated flexure stress. The applied stress level was 138 kPa at 25°C. The loading cycle consist of 0.1 second loading application followed by 0.9 seconds of rest period. The test was conducted for 660 load repetitions using the Pneumatic repeated load system (RPLS) to allow for the initiation of micro cracks. After the specified loading cycles, the test was stopped and the Specimens have been withdrawn from the testing chamber of PRLS and stored in the oven for two hours at 60°C environment to allow for possible micro crack healing. The specimens were then subjected to another loading cycle. Permanent, total and resilient deformations were captured through LVDT. The resilient modulus was calculated and compared among various conditions. Test results showed that the implemented polymer additives and the process of micro crack healing have positive influence on resilient modulus and deformation variables of asphalt concrete.

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“…The standard used for the beam fatigue is (AASHTO T 321, 2007) and (SHRP M-008, 1994). The number of cycles at 50% of its initial stiffness can be considered as the fatigue life of the asphalt mixture for that particular tested strain or stress level (Sarsam and AL-Lamy, 2015). (Hartman and Gikhrist, 2004) evaluated the fatigue of Asphalt Concrete Mix by using the four point bending test; beam samples of (305 mm long, 50 mm wide and 45 mm deep) were constructed.…”

Section: Introductionmentioning

confidence: 99%

Impact of Gradation and Filler Type on Fatigue Behavior of Asphalt Concrete

Sarsam¹,

Al-Delfi²

2015

IJSRK

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Abstract. Fatigue cracking is a common mode of distress in asphalt pavement. The main objective of this work is to determine the impact of variation in aggregate gradations and mineral filler types, on fatigue cracking potential at different testing temperatures. Roller compacted asphalt concrete slab samples were prepared in the laboratory, beam specimens were sawed from the slabs and subjected to Repeated Flexural Beam Fatigue Testing with the following variables: two testing temperature (20 and 5) °C, three percentages of asphalt content (OAC ± 0.5), two types of aggregate gradation representing SCRB, 2003 wearing course, and Road Note 31 (1993). Two types of mineral filler, limestone dust and coal fly ash. It was concluded that Fatigue life was reduced by 73.70%, 72.78%, 76.13% and 77.49 % when the testing temperatures changed from 20 to 5° C at OAC for mixture type I, type II, type III and type IV, respectively. Aggregate gradation according to SCRB specification was more resistant to fatigue cracking than Road Note 31 gradation at different testing conditions. Fatigue life was reduced by 15.28% and 23.11% when the aggregate gradation changed from SCRB specification to Road Note 31specfication for OAC at 20 and 5 ˚C testing temperature, respectively. Coal fly ash exhibit more resistant to fatigue cracking than limestone dust when used as a mineral filler at different testing conditions. When the testing temperature was 20 ˚C and aggregate gradation was SCRB, fatigue life was increased by 13.25% when filler type was changed from limestone dust to coal fly ash at OAC.

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Fatigue Life Assessment of Modified Asphalt Concrete

Cited by 16 publications

References 9 publications

Assessment of Fatigue Life and Stiffness of Asphalt Concrete After Implementation of Additives

Assessment of Fatigue Life and Stiffness of Asphalt Concrete After Implementation of Additives

Resilient Behavior of Modified Asphalt Concrete Mixture

Impact of Gradation and Filler Type on Fatigue Behavior of Asphalt Concrete

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