Influence of reclaimed asphalt pavement content on complex modulus of asphalt binder blends and corresponding mixes: experimental results and modelling

2013 ◽  
Vol 14 (sup1) ◽  
pp. 132-148 ◽  
Author(s):  
S. Mangiafico ◽  
H. Di Benedetto ◽  
C. Sauzéat ◽  
F. Olard ◽  
S. Pouget ◽  
...  
Keyword(s):  
Complex Modulus ◽  
Asphalt Pavement ◽  
Asphalt Binder ◽  
Experimental Results ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt

scholarly journals Prediction of Dynamic Modulus of Hot Mix Asphalts with Reclaimed Asphalt Pavement

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Zahid Hossain ◽  
Musharraf Zaman
Keyword(s):  
Dynamic Modulus ◽  
Viscoelastic Properties ◽  
Complex Modulus ◽  
Asphalt Pavement ◽  
Asphalt Binder ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Performance Grade ◽  
Creep Stiffness ◽  
Rotational Viscosity

This study evaluated the viscoelastic properties of a performance grade (PG) binder blended with different percentages of binders recovered from reclaimed asphalt pavement (RAP) for conditions (materials, climate, and specifications) prevailing in Oklahoma. The viscoelastic properties of the blended binders were then used to estimate dynamic modulus ( E ∗ ) values of the new mixes with RAP by using the Witczak model through time-temperature superposition (TTS) principles. The recovered binder from RAP was found to be significantly stiffer than the virgin binder (PG 64-22). The addition of RAP increased the complex modulus ( G ∗ ) of the base binder, so did the E ∗ of the corresponding mix. The creep stiffness resistance of the asphalt binder at low service temperatures decreased with the addition of RAP. With up to 10% RAP binder, no notable changes were observed in the viscosity and PG grade of the virgin binder. With 25% and 40% RAP binder, the PGs of the blended binders were found to be PG 70-16 and PG 76-16, respectively. It was observed that the E ∗ master curves predicted from PGs of the blended binders were in close agreement with those estimated from the laboratory-measured E ∗ data. The dynamic shear rheometer (DSR) data of rotational thin film oven (RTFO)-aged blended binders predicted significantly lower E ∗ values compared to the measured ones. The E ∗ values predicted from rotational viscosity (RV) test data were found to be higher than the measured E ∗ values. The findings of this study are expected to provide transportation professionals with a better understanding of new mixes with high RAPs.

Rejuvenator Influence on Aged Binder Material Properties

2017 ◽  
Vol 730 ◽  
pp. 380-388 ◽  
Author(s):  
Michal Varaus ◽  
Tomas Koudelka ◽  
Pavel Sperka
Keyword(s):  
Asphalt Pavement ◽  
Asphalt Binder ◽  
Asphalt Mixtures ◽  
Reclaimed Asphalt Pavement ◽  
Optimum Amount ◽  
Bending Beam Rheometer ◽  
Reclaimed Asphalt ◽  
Binder Material ◽  
Aged Binder ◽  
Ball Test

As the amount of reclaimed asphalt pavement (RAP) material used in asphalt mixtures has increased recently, it is vital to address problems regarding aged binder incorporated in RAP. Asphalt binder hardens during its production process as well as during service life of pavements. External influences such as oxygen and ultraviolet radiation affect greatly bitumen characteristics. Thanks to adding rejuvenating agents, the original binder properties should be recovered and resulting asphalt binder parameters should become equal to those measured upon the reference material. In this study, four different rejuvenator agents and one neat soft binder were employed to rejuvenate the artificially aged binder by a complete blending between both constituents. Thereafter, empirical as well as performance based binder properties were examined with a dynamic shear rheometer (DSR) and with a bending beam rheometer (BBR). Three different dosages of each rejuvenator were added to evaluate the required amount for the original binder properties to be restored. Moreover, the softening efficiency of each agent was assessed by means of the Ring and Ball test. Finally, the optimum amount of each rejuvenator needed for the blend to achieve the target specification was determined. It can be concluded that the rejuvenators affect binder properties greatly, and mainly in a positive way. However, the data also indicate significant discrepancies between the types of the rejuvenator.

scholarly journals Desempenho de misturas asfálticas recicladas mornas e sua influência no dimensionamento do revestimento asfáltico

2020 ◽  
Vol 41 (2) ◽  
pp. 157
Author(s):  
Fernanda Gadler ◽  
Leonardo Fagundes Rosemback Miranda ◽  
Joe Villena
Keyword(s):  
Resilient Modulus ◽  
Asphalt Pavement ◽  
Asphalt Binder ◽  
Binder Content ◽  
Asphalt Mixtures ◽  
Recycled Concrete ◽  
Concrete Aggregate ◽  
Reclaimed Asphalt Pavement ◽  
Recycled Concrete Aggregate ◽  
Reclaimed Asphalt

The main purpose is to evaluate the performance of asphalt regarding resilient modulus and fatigue curve.The asphalt was produced with two wastes, reclaimed asphalt pavement (RAP) and recycled concrete aggregate (RCA), using the technique of warm mixtures. The evaluation includes, based on these parameters, the thickness differences in the design of asphalt layer for each mixture. Five asphalt mixtures were produced with incorporation of RAP and RCA, in different gradation fractions (fine and/or course), without adding any natural aggregate. In view of the aim of the article, the mixtures were evaluated through tests of resilient modulus and fatigue life, in order to support the design, establishing the necessary thickness to meet traffic demands of each mixture. The design was performed using MeDiNa software. Among all results, it is highlighted that asphalt binder content is the component that exerts the greatest influence on the resilient modulus of the mixtures. As for fatigue, in addition to the binder content, the possible anchoring of the asphalt binder in the pores of the RCA may have favored the performance of the GARC_MRAP mixture. Still, all mixtures with RAP, both in fine or course fraction, resulted in lower coating thicknesses compared to the REF, for the same load request, with better performance of the GARC_MRAP mixture produced with 100 % waste material and incorporation of only 3.1 % neat binder.

scholarly journals Characteristics of the complex modulus of recycled cold mix with foamed bitumen and recycled concrete aggregate

2019 ◽  
Vol 262 ◽  
pp. 05002 ◽  
Author(s):  
Przemysław Buczyński ◽  
Marek Iwański
Keyword(s):  
Phase Angle ◽  
Complex Modulus ◽  
Asphalt Pavement ◽  
Recycled Concrete ◽  
Time Range ◽  
Concrete Aggregate ◽  
Reclaimed Asphalt Pavement ◽  
Recycled Concrete Aggregate ◽  
Reclaimed Asphalt ◽  
Foamed Bitumen

This article presents research on recycled cold mix with foamed bitumen (MCAS) containing recycled concrete aggregate. The primary concept driving this research was to determine if recycled concrete aggregate (RC) could be used as a substitute for reclaimed asphalt pavement (RAP). Recycled concrete aggregate was used in the MCAS mix in amounts ranging from 20%, 60% and 80%. The reference mix was the MCAS mix containing 50% reclaimed asphalt pavement (RAP) and virgin aggregate. Identical 0/31.5-mm continuously graded dolomite virgin aggregate was used in all mixes. 2.5% foamed bitumen (FB) and 2.0% CEM I 42.5R Portland cement (PC) were used to increase the cohesion of the mineral mix. Foamed bitumen was produced from 50/70 penetration paving bitumen. The behaviour of the recycled base course was tested in the range of cyclic sinusoidal strain with amplitude εo = 25–50 με. The tests were carried out in the (-7°C, 5°C, 13°C, 25°C, 40°C) temperature and (0.1 Hz, 0.3 Hz, 1 Hz, 3 Hz, 10 Hz, 20 Hz) loading time range. The complex modulus was tested in a direct tension-compression test on cylindrical samples (DTC-CY) in accordance with EN 12697-26. The results of the tests were used to assess the complex modulus (E*), phase angle (φ) and complex modulus components (E1) and (E2).Tests of the mixes indicate that recycled concrete aggregate can be used in recycled cold mixes in amounts of up to 80%. Increasing the amount of recycled concrete aggregate does not cause excessive stiffness of the recycled mix in comparison with the reference mix. The tests did not demonstrate a significant difference in terms of the phase angle (φ), which indicates a similar content of the viscous part and elastic part in the obtained complex modulus for the reference mix (RAP + MCAS) and the mix containing recycled concrete aggregate (RC + MCAS).

Detection of Reclaimed Asphalt Pavement Presence in Asphalt Mixtures Using a Method of Successive Asphalt Binder Extraction

2021 ◽  
Vol 904 ◽  
pp. 458-463
Author(s):  
Jiří Sachr ◽  
Ondrej Dasek ◽  
Petr Hyzl
Keyword(s):  
Asphalt Pavement ◽  
Asphalt Binder ◽  
Asphalt Mixtures ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Needle Penetration ◽  
Successive Extraction ◽  
Complex Shear ◽  
Empirical Tests ◽  
Aged Binder

The work deals with the detection of presence of RAP (reclaimed asphalt pavement) in asphalt mixtures. Information about the presence of RAP in an asphalt layer can be technically advantageous, for example, when planning further recycling of the layer. The method described in the paper can also be used to verify the success of a treatment of an aged binder in RAP, which is dosed in the production of new asphalt mixtures. The asphalt binder was obtained by a method of successive extraction from asphalt mixtures with different RAP content. Basic empirical tests of the asphalt binder (needle penetration and softening point) were chosen to detect the presence of RAP. The complex shear modulus G* was further determined on the extracted binders using a dynamic shear rheometer (DSR).

Use of Rejuvenators to Rejuvenate Asphalt Binders in RAP

2017 ◽  
Vol 737 ◽  
pp. 547-553
Author(s):  
Iva Krcmova ◽  
Petr Hyzl ◽  
Pavla Nekulova ◽  
Pavel Coufalik ◽  
Ondrej Dasek
Keyword(s):  
Asphalt Pavement ◽  
Asphalt Binder ◽  
Chemical Properties ◽  
Asphalt Binders ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Aged Asphalt ◽  
Empirical Tests ◽  
The Individual ◽  
Physical And Chemical

With increased demand and limited aggregate and binder supply, hot mix asphalt (HMA) producers discovered that reclaimed asphalt pavement (RAP) is a valuable component in HMA. This paper is concerned with the current issue of higher using RAP (Reclaimed Asphalt Pavement) in asphalt mixtures for pavement wearing courses. It describes the effects of application of three types of rejuvenation additives on properties of aged asphalt binders made from a regular RAP. These rejuvenation additives restore the physical and chemical properties of aged binders. In addition, the aged asphalt binder with rejuvenators applied was subjected to a short-term laboratory aging using the RTFOT (Rolling Thin Film Oven Test). This method simulate aging asphalt binder during the manufacturing process and laying. To assess the binder properties, both the standard empirical tests and more advanced functional tests (dynamic shear rheometer and bending beam rheometer) have been performed. Last part of the paper provides an evaluation of the individual rejuvenation additives. Based on the results it can be concluded that a positive change in properties of aged asphalt binder after applying all the three rejuvenators has been proven.

scholarly journals PERFORMANCE PREDICTION OF WARM MIX ASPHALT PAVEMENT CONTAINING RECLAIMED ASPHALT PAVEMENT IN RHODE ISLAND

2019 ◽  
Author(s):  
◽  
Neha Shrestha ◽  
Keyword(s):  
Surface Layer ◽  
Asphalt Pavement ◽  
Asphalt Binder ◽  
Fatigue Cracking ◽  
Thermal Cracking ◽  
Creep Recovery ◽  
Reclaimed Asphalt Pavement ◽  
Cracking Resistance ◽  
Rutting Resistance ◽  
Reclaimed Asphalt

The warm mixed asphalt (WMA) technology has gained a lot of interests in the recent years in academia, state agencies and industries. WMA technology allows reductions in production and compaction temperatures guaranteeing relevant environmental and cost saving benefits. The purpose of the present study was to study and evaluate the performance of a typical additive in WMA pavement with Reclaimed Asphalt Pavement (RAP) on rutting, fatigue cracking and thermal cracking resistance on RI Route 102. In the present study, the asphalt binder was tested at different dosages of additive using Dynamic Shear Rheometer (DSR), Rolling Thin Film Oven (RTFO), Pressure Aging Vessel (PAV), Multiple Stress Creep Recovery (MSCR) and Bending Beam Rheometer (BBR). From the overall test, it was found that 0.7% additive would lessen pavement damage due to rutting, fatigue cracking and thermal cracking. Based on the results of binder test, Hot Mix Asphalt (HMA) and WMA specimens containing 20 % RAP were prepared using PG 58-28 asphalt binder and Superpave Gyratory Compactor (SGC). From the volumetric analysis of both HMA and WMA specimens, it was determined that the optimum binder content (OBC) for HMA with 20% RAP was 5.3 percent and the OBC for WMA (0.7% additive with RAP was 5.6%. It was found that the required amount of neat regular asphalt binder for WMA specimen was higher than the one required by HMA. HMA and WMA Specimens with each containing 20% RAP were prepared at OBC and indirect tensile (IDT) strength test were conducted on that specimen. The test indicated that the performance of HMA mixtures was better than WMA with same amount of RAP. RI Route 102 was used as case study in this research study. Route 102 was rehabilitated through Full Depth Reclamation (FDR) in 2015. First half road of RI Route 102 was built with HMA base and surface layer and the other half was built with WMA base and surface layer using a typical additive. It was found that both sections have similar value in Pavement Serviceability Index (PSI) and in International Roughness Index (IRI) at this time. Four specimens were prepared to predict the performance of asphalt pavement using the dynamic modulus and the master curve. Two HMA specimens each were prepared with and without RAP. Similarly, other two WMA specimens were prepared with and without RAP. These four specimens were tested with the Asphalt Mixture Performance Tester (AMPT) machine and developed the master curves for each specimen. The results of the material testing were used to predict the performance of each test sections by using AASHTOWare Pavement ME Design (PavementME) software. It was found that the WMA-RAP performed better in fatigue cracking resistance but was found to perform poor in rutting resistance than HMA and HMA-RAP. This indicated that fatigue cracking was not a problem with WMA-RAP mixtures whereas rutting resistance still requires further investigation and improvement.

Sign in / Sign up

Export Citation Format

Share Document