Effects of rejuvenators on high-RAP mixtures based on laboratory tests of asphalt concrete (AC) mixtures and fine aggregate matrix (FAM) mixtures

Nabizadeh, Hesamaddin; Haghshenas, Hamzeh F.; Kim, Yong-Rak; Aragão, Francisco Thiago Sacramento

doi:10.1016/j.conbuildmat.2017.06.101

Cited by 77 publications

(22 citation statements)

References 21 publications

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“…The results clearly show that the addition of rejuvenators decreases both high and low temperatures of VBR. This observation confirms that the rejuvenators soften the aged asphalt binder, as many other studies (e.g., 23 , 27 – 32 ) have shown. Figure 2 a demonstrates that the high-temperature PG controls the maximum allowable dosage of rejuvenator, and the low-temperature PG limits the minimum required dosage (Figure 2 b ).…”

Section: Laboratory Tests and Resultssupporting

confidence: 90%

Mechanical-Chemical Characterization of the Effects of Type, Dosage, and Treatment Methods of Rejuvenators in Aged Bituminous Materials

Nsengiyumva

Haghshenas

Kim

et al. 2020

Transportation Research Record

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Proper use of rejuvenators can improve the properties and performance of aged asphalt mixtures; however, there is currently a lack of understanding on how rejuvenator treatment details, such as type-dosage of rejuvenators and blending-curing of rejuvenation, affect properties and performance characteristics. This study aims to investigate the effects of type, dosage, and treatment methods of rejuvenators when added into aged bituminous materials. To meet the goal, three rejuvenators, categorized by their production technology, were selected to improve a high-recycled asphalt pavement mixture by conducting various binder-level and mixture-level tests. For the binder-level testing, the performance grading (PG) method was used to primarily determine proper dosages targeting desired binder grades, and two chemical tests (Fourier-transform infrared spectroscopy and Saturate, Aromatic, Resin and Asphaltene) were conducted to examine chemical characteristics altered by rejuvenation and the further aging process. The selected dosage levels from the binder testing were then applied to mixture-level performance evaluation by conducting two tests: flow number for rutting and semicircular bending fracture for cracking. Test-analysis results indicated that although it can successfully determine the proper dosage range of rejuvenators, PG binder testing is limited to only assessing the effects of rejuvenators on mechanical properties; this can be better aided by integrating chemical characterization that provides a more in-depth material-specific rejuvenation process. Moreover, it appears that rejuvenation methods can alter the performance of aged mixtures. Therefore, the selection of rejuvenators and their implementation into practice should be carried out considering multiple aspects, not only its PG recovery.

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Section: Laboratory Tests and Resultssupporting

confidence: 90%

Mechanical-Chemical Characterization of the Effects of Type, Dosage, and Treatment Methods of Rejuvenators in Aged Bituminous Materials

Nsengiyumva

Haghshenas

Kim

et al. 2020

Transportation Research Record

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“…These samples were not collected in consecutive days; collecting data in consecutive days might provide opportunity for happening the bias in data. In addition, the minimum number of data more than 30 for each sample could help that the sample set would be approximately normal [37][38][39][40][41]. Such data sets would be suitable to conduct statistical analysis with reliable results [42][43][44][45][46][47].…”

Section: Discussionmentioning

confidence: 99%

A Statistical-based Approach to Evaluate the Production of Crawler-type Dozer in Construction Projects

Rafsanjani¹,

Gholipour²,

Xue³

2018

AJCEA

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Estimating the actual production rate of construction machinery which clearly differs from nominal production provided by machinery manufacturers always is a critical challenge in construction projects execution. Studies indicate that true estimation of actual production is a key element in estimating the time and cost required to terminate construction operations. However, current literature shows that it is still a quite challenging to estimate actual production. In particular, there are various independent parameters that affect the actual production rate. Understanding the role and importance of each parameter could lead to an accurate estimation for production rates. To this end, this paper presents a statistical-based approach to find the discrepancies between the nominal and actual production rates of crawler-type dozers and to understand how various parameters could affects the actual production rates. The data for the actual production of machine were records from productivity measurement of 39 dozers. Working condition, type of materials, and ground slope are three main independent parameters considered and evaluated for each machine. The results obtained from statistical analyses on the data and a comparison between these results with the data provided by Caterpillar and Komatsu manufacturers show a) the discrepancies between the actual and nominal hourly production, b) the effect of individual parameters on actual production, and c) the relationship between machinery working age and discrepancies. The findings of this study could be a unique help for project managers in planning of machinery and equipment in a project site.

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“…Because of the importance of the viscoelastic property of FAM in the performance of asphalt pavement, various numerical and experimental studies have been conducted to evaluate the complex modulus of FAM (Arega et al, 2013;Nabizadeh et al, 2017;Suresha & Ningappa, 2018;Underwood & Kim, 2011, 2012Y. Zhang et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

An efficient model for predicting the dynamic performance of fine aggregate matrix

Leng

Tan

Cao

et al. 2021

Computer aided Civil Eng

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Fine aggregate matrix (FAM) refers to the mixture of asphalt binder and fine aggregate in asphalt mixture. The viscoelastic properties, such as the complex modulus of FAM, directly affect the performance of asphalt pavement. In this study, finite element (FE) simulation by coupling random aggregate distribution algorithm and steady-state dynamic (SSD) analysis was applied to predict the complex modulus of FAM. Both the dynamic moduli and phase angles of FAM were predicted and compared with those obtained from laboratory tests. The modeling and testing results indicated that the complex interface layer between asphalt mastic and aggregate can significantly affect the viscoelastic performance of FAMs. Considering the interface layer into the FE model can improve the prediction accuracy. Besides, the simulation results showed that the SSD method is 576 times more efficient in predicting the dynamic moduli and phase angles of FAMs than the conventional transient dynamic method, indicating its high potential for multi-scale modeling of asphalt mixture.

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Effects of rejuvenators on high-RAP mixtures based on laboratory tests of asphalt concrete (AC) mixtures and fine aggregate matrix (FAM) mixtures

Cited by 77 publications

References 21 publications

Mechanical-Chemical Characterization of the Effects of Type, Dosage, and Treatment Methods of Rejuvenators in Aged Bituminous Materials

Mechanical-Chemical Characterization of the Effects of Type, Dosage, and Treatment Methods of Rejuvenators in Aged Bituminous Materials

A Statistical-based Approach to Evaluate the Production of Crawler-type Dozer in Construction Projects

An efficient model for predicting the dynamic performance of fine aggregate matrix

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