A viscoelastic-based model for predicting the strength of asphalt concrete in direct tension

Keshavarzi, Behrooz; Kim, Youngsoo Richard

doi:10.1016/j.conbuildmat.2016.06.089

Cited by 31 publications

(7 citation statements)

References 15 publications

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“…24 Error percentage for m-value As can be seen in these tables, the rheological test results of the modified asphalt binders with optimum dosage of additives were close to the results of the rheological test of the virgin asphalt binder. However, in general, additive 1 made the modified asphalt binder softer than virgin binder and additive 2 made it harder.…”

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confidence: 63%

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Laboratory evaluation of eco-friendly additives for warm in- place recycling technology

Bozorgzad¹

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are thanked for their dedicated assistance and support in the course of the study. The advice and comments of Dr. Scott Schram of the Iowa DOT is much appreciated. My deepest gratitude goes to my advisor Prof. Hosin (David) Lee for his guidance, support, and mentorship throughout the development of this study. Special thanks are expressed to other members of the doctoral committee, Paul Hanley, M. Asghar Bhatti, Salam Rahmatalla, and Aixin Tan. Last but not least, I would like to sincerely thank my parents and my younger brother for their endless support, motivation, encouragement, and love. This dissertation is dedicated to them! iv ABSTRACT Hot and cold in-place recycling are two of the economical and well-known pavement rehabilitation strategies that can be used to recycle existing pavements. Two main limitations of hot in-place recycling (HIR) are high mixing and compaction temperatures, and a low percentage of using recycling materials in new mixtures. For cold in-place recycling (CIR), damaging the aggregate gradation of milled mixtures and low quality of final mixtures are major restrictions.In this study, eco-friendly additives to be used for warm in-place recycling technology (WIR) are proposed. To make this mix, two WIR additives were developed to decrease the mixing and compaction temperature while increasing increase the RAP percentage in Warm in-place recycling (WIR) process.In order to evaluate the products, the mixing and compaction temperatures of mixture were measured and the performance of three different mixture types with three different percentages of RAP were evaluated. The Superpave test was conducted to identify the optimum dosage of two WIR additives and for additive 1 and 2, 3.99% and 7.77% were identified as optimum dosages respectively. To verify this optimum dosage, the second group of Superpave tests were conducted on modified asphalt binder sample and the results had acceptable correlation with first set of rheological tests. The Multiple Stress Creep Recovery (MSCR) and Fourier Transform Infrared (FTIR) Spectroscopy tests were done on modified asphalt binder with WIR additives to better understand the effects of additives on recoverability, rutting resistance and aging mechanism of modified asphalt binder.The performance properties of mixtures containing 30, 70 and 100 percent RAP material which modified with optimum percentage of two different additives were v investigated. Hamburg Wheel Tracking test (HWT) was conducted to evaluate the moisture susceptibility and rutting performance of modified mixture. According to this test results, none of the modified mixtures with additives did not have the moisture susceptibility and rutting problems. Although, additive 2 made the mixture softer than additive 1, but it did not have a significant effect on rutting. Disc-Shaped Compacted Tension (DCT) test was considered to evaluate the fracture properties of mixture at low temperature. Test result showed that additive 2 was more effective in lowering the low-temperature cracking and modified...

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confidence: 63%

“…Pavements with stable and adequate base are suitable for this process. The most common scarification depth starts from 20mm or 25mm to 50mm that can be achieved [22]- [24]. If a hot mix asphalt is separately placed after the surface recycling, the process is considered to be a two-pass method.…”

Section: Surface Recycling Methods and Equipmentmentioning

confidence: 99%

Laboratory evaluation of eco-friendly additives for warm in- place recycling technology

Bozorgzad¹

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“…With regard to asphalt concrete, various quasi-static tests and dynamic tests are designed to characterize its rheological behavior. According to AASHTO TP79 [10] and TP107 [11], the visco-elastic and damage parameters can be determined via dynamic modulus tests and cyclic direct tension tests on the Asphalt Material Performance Tester (AMPT), respectively [12,13]. Besides, quasi-static and dynamic uniaxial tests in both tension and compression can be conducted by using the MTS machine [14].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of Compression-Tension asymmetry in asphalt matrix under Quasi-static and dynamic loads via an integrated DMA-based approach

Dai

Laheri

Zhu

et al. 2021

Construction and Building Materials

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“…In fact, the linear viscoelastic theory is widely used to predict the fundamental properties of asphalt mixture. For example, Keshavarzi et al [7] proposed a new method for studying the viscoelastic behavior of asphalt mixture in uniaxial tension. Gudmarsson et al [8] compared the complex modulus and complex Poisson's ratio determined through modal testing with cyclic tension-compression measured complex moduli and complex Poisson's ratio of asphalt mixture to further apply the simpler and more economic modal testing for characterizing the linear viscoelastic properties of asphalt mixture.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Microstructural Damage Properties of Asphalt Mixture Using Linear and Damage-Coupled Viscoelastic Model

et al. 2019

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This paper presents an image-based micromechanical modeling approach for simulating the damage-couple viscoelastic response of asphalt mixture. Details of the numerical damage-couple viscoelastic constitutive formulation implemented in a finite element code are presented and illustrated by using the ABAQUS user material subroutine (UMAT). Then, an experimental procedure based on the Linear Amplitude Sweep test for obtaining the viscoelastic and damage parameters at a given temperature was conducted. An improved morphological multi-scale algorithm was employed to segment the adhesive coarse aggregate images. We developed a pixel-based digital reconstruction model of asphalt mixture with the X-ray CT image after being processed. Finally, the image-based FE model incorporated with damage-coupled viscoelastic asphalt mastic phase and elastic aggregates was used for the compressive test simulations successfully in this study. Simulation results showed that the damaged simulation results have a larger stress distribution compared with the undamaged simulation due to the irregularity of the coarse aggregates. The von Mises stress distribution is smaller as the loading time increases due to the viscoelastic behavior of asphalt mastic. It can also provide insight on the damaged mechanisms and the possible location in asphalt mixture where microscopic cracking would most likely occur.

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A viscoelastic-based model for predicting the strength of asphalt concrete in direct tension

Cited by 31 publications

References 15 publications

Laboratory evaluation of eco-friendly additives for warm in- place recycling technology

Laboratory evaluation of eco-friendly additives for warm in- place recycling technology

Experimental study of Compression-Tension asymmetry in asphalt matrix under Quasi-static and dynamic loads via an integrated DMA-based approach

Investigation on Microstructural Damage Properties of Asphalt Mixture Using Linear and Damage-Coupled Viscoelastic Model

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