Use of Blended Binder Tests to Estimate Performance of Mixtures with High Reclaimed Asphalt Pavement/Recycled Asphalt Shingles Content

2021 ◽  
pp. 036119812199742
Author(s):  
Yuan Zhang ◽  
Daniel Swiertz ◽  
Hussain U. Bahia
Keyword(s):  
Asphalt Pavement ◽  
Effective Means ◽  
Creep Recovery ◽  
Reclaimed Asphalt Pavement ◽  
Recycled Asphalt ◽  
Performance Properties ◽  
Reclaimed Asphalt ◽  
Recycled Asphalt Shingles ◽  
Asphalt Shingles

The purpose of this study is to assess the use of blended binder tests to estimate mixture performance properties of high reclaimed asphalt pavement (RAP)/recycled asphalt shingles (RAS) mixtures utilizing recycling agents as a means to evaluate different recycling agents and estimate their doses for a given mixture. Blended binder properties are measured by using standard performance grading (PG) and PG+ test methods and correlating the results with corresponding performance properties of mixtures. Blended binders consisting of virgin and recovered binders and recycling agents were prepared and tested for PG grading properties, multiple stress creep recovery grades, and linear amplitude sweep fatigue life after the rolling thin-film oven and pressure aging vessel aging. Mixtures were tested for rutting resistance and cracking resistance at intermediate temperature and at low temperatures after being subjected to short-term oven aging and long-term oven aging. The correlation between the blended binder properties and mixture performance properties is used to identify the binder test parameters that can be used to predict the long-term performance of high RAP/RAS mixtures and the effects of various recycling agents. Results generally indicate that use of direct testing of recovered binders with recycling agents is an effective means to estimate required initial dose for recycling agent, and testing actual blended binders can be used to predict mixture performance-related properties for the testing conditions used in this study.

Utilizing Network and Project-Level Data to Evaluate Impact of Reclaimed Asphalt Pavement and Recycled Asphalt Shingles on Laboratory and Field Performance in Texas

2018 ◽  
Vol 2672 (28) ◽  
pp. 52-58
Author(s):  
Berenice Salaices ◽  
David Teutli ◽  
Imad Abdallah ◽  
Anjan Kumar Siddagangaiah ◽  
Soheil Nazarian
Keyword(s):  
Asphalt Pavement ◽  
Field Performance ◽  
Reclaimed Asphalt Pavement ◽  
Recycled Asphalt ◽  
Asphalt Mixes ◽  
Reclaimed Asphalt ◽  
Level Data ◽  
Recycled Asphalt Shingles ◽  
Performance Patterns ◽  
Project Level

The incorporation of reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS) in asphalt mixes is encouraged as long as the modified mix exhibits equal or improved performance. Through the integration and data mining from several statewide databases, and extensive laboratory and field testing, this paper investigates the performance of asphalt mixes containing RAP, RAS, or both relative to similar mixes with virgin components. The integration of several databases permitted a network-level investigation of performance patterns. The reasonableness of the observed performance patterns was assessed using the results from the Hamburg wheel tracking tests (HWTT) and indirect tensile strength tests performed on specimens from several sites included in a network-level database. Furthermore, the retrieved network-level data were cross-referenced to the results from a historical performance database. At project level, HWTT and the overlay tester tests were performed on samples from several dozen sites to characterize laboratory performance. Field performance of these sites was also documented through periodic cracking and rutting surveys. From the network-level assessment, the impact of RAP, RAS, or both on the performance of the mixes was found to be mix-dependent. The combination of RAP and RAS seems to negatively affect cracking resistance. Further, dense-graded and Superpave mixes with RAP, RAS, or both exhibit higher cracking potential with minimal impact on rutting resistance. The project-level field performance evaluation shows that fatigue cracking propagates at a higher rate for sections with RAP and RAS than for sections with only RAP.

scholarly journals Effect of Rejuvenated Binder on the Pavement Rutting Performance at Different Aging Levels

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Hesham A. Ali ◽  
Farshad Haddadi ◽  
Mojtaba Mohammadafzali ◽  
Greg Sholar ◽  
Howard Moseley
Keyword(s):  
Asphalt Pavement ◽  
Effective Means ◽  
Reclaimed Asphalt Pavement ◽  
Test Results ◽  
Short Term ◽  
Moisture Susceptibility ◽  
Reclaimed Asphalt ◽  
Performance Grading ◽  
Determining Factor

The use of Reclaimed Asphalt Pavement (RAP) in virgin mixtures is an effective means of promoting sustainability. The objective of this research was to investigate the effect of rejuvenated binder on the rutting performance and moisture susceptibility of high RAP content mixtures. All mixtures were tested at three aging levels, one short-term aging level, and two long-term aging levels. The performance of the specimens and the level of diffusion were measured and compared, and the correlation between binder test and rutting test results was evaluated. Based on the results, the degree of diffusion is not a determining factor in the performance of the mixture. However, the amount of the rejuvenator and Superpave performance grading (PG) of the rejuvenated binder is the most effective parameter. Results indicate that the short-term aged recycled mix exhibits a better rutting resistance than the virgin mix when its HTPG is 6°C higher than the virgin mix.

Performance Evaluation of Asphalt Mixtures with Reclaimed Asphalt Pavement and Recycled Asphalt Shingles in Missouri

2019 ◽  
Vol 2673 (2) ◽  
pp. 392-403 ◽  
Author(s):  
Behnam Jahangiri ◽  
Hamed Majidifard ◽  
James Meister ◽  
William G. Buttlar
Keyword(s):  
Low Temperature ◽  
Fracture Energy ◽  
Asphalt Pavement ◽  
Asphalt Mixtures ◽  
Reclaimed Asphalt Pavement ◽  
Performance Tests ◽  
Recycled Asphalt ◽  
Reclaimed Asphalt ◽  
Recycled Asphalt Shingles ◽  
Flexibility Index

This study investigates the performance of eighteen different dense-graded asphalt mixtures paved in Missouri. The sections contain a wide range of reclaimed asphalt pavement (RAP) and recycled asphalt shingles (RAS), and different types of additives. The large number of sections investigated and the associated breadth of asphalt mixtures tested provided a robust data set to evaluate the range, repeatability, and relative values provided by modern mixture performance tests. As cracking is one of the most prevalent distresses in Missouri, performance tests such as the disk-shaped compact tension test (DC[T]) and Illinois flexibility index test (I-FIT) were used to evaluate the cracking potential of the sampled field cores. In addition, the Hamburg wheel tracking test (HWTT) was employed to assess rutting and stripping potential. Asphalt binder replacement (ABR) and binder grade bumping at low temperature were found to be critical factors in low-temperature cracking resistance as assessed by the DC(T) fracture energy test. Six sections were found to perform well in the DC(T) test, likely as a result of binder grade bumping (softer grade selection) or because of low recycling content. However, all of the sections were characterized as having brittle behavior by the I-FIT flexibility index. Service life and ABR were key factors in the I-FIT test. Finally, a performance-space diagram including DC(T) fracture energy and HWTT rut depth was used to identify mixtures with higher usable temperature interval (UTImix), some of which contained significant amounts of recycled material.

Characterization of binder and mix properties to detect reclaimed asphalt pavement content in bituminous mixtures

2007 ◽  
Vol 34 (5) ◽  
pp. 581-588 ◽  
Author(s):  
J S Chen ◽  
P Y Chu ◽  
Y Y Lin ◽  
K Y Lin
Keyword(s):  
Energy Loss ◽  
Asphalt Pavement ◽  
Testing Procedure ◽  
Relative Energy ◽  
Engineering Properties ◽  
Reclaimed Asphalt Pavement ◽  
Recycled Asphalt ◽  
Reclaimed Asphalt ◽  
Bituminous Mixtures ◽  
Noticeable Increase

Abstract: The purpose of this study was to recommend a testing procedure to detect the content of reclaimed asphalt pavement (RAP) used in hot-mix asphalt mixtures. Asphalt was extracted from RAP for use in blending with new binder and aggregate. The recovered binders were blended with virgin asphalt (AC-10) at 10 different concentrations. A concept called relative energy loss was proposed to determine the engineering properties of recycled asphalt concrete (RAC). The relative energy loss was found to be directly related to the resistance of RAC to moisture-induced damage. A noticeable increase in relative energy loss with as much as 50% RAP was observed. At 20% RAP, there was not enough RAP to change binder or mixture properties. The predicted performance of mixtures containing up to 40% RAP by weight was shown to be similar to that of virgin material mixtures. A model was developed to estimate the RAP content in terms of penetration, viscosity, and relative energy loss. Key words: reclaimed asphalt pavement, relative energy loss, moisture sensitivity.

Sign in / Sign up

Export Citation Format

Share Document