Nonrecoverable Behavior of Polymer Modified and Reclaimed Asphalt Pavement Modified Binder under Different Multiple Stress Creep Recovery Tests

2018 ◽  
Vol 2672 (28) ◽  
pp. 324-336 ◽  
Author(s):  
Zhou Zhou ◽  
Xingyu Gu ◽  
Jiwang Jiang ◽  
Fujian Ni ◽  
Yanxu Jiang
Keyword(s):  
Asphalt Pavement ◽  
Test Method ◽  
Creep Recovery ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Multiple Stress ◽  
Stress Levels ◽  
Multiple Stress Creep Recovery ◽  
Modified Binder ◽  
Recovery Cycles

Chinese transportation agencies usually use the styrene–butadiene–styrene (SBS) modified binder and rejuvenators when applying higher reclaimed asphalt pavement (RAP) in surface courses. However, the rutting performance of RAP binder containing SBS binder and rejuvenators remains a problem. In order to better evaluate the rutting performance of asphalt binder, recently, a multiple stress creep recovery (MSCR) test (AASHTO T 350) was proposed and approved. This paper critically reviewed the AASHTO T 350 test method and AASHTO M 332 specification by carrying out a series of MSCR tests. A total of 18 types of SBS modified and modified RAP binders were tested. The effect of a rejuvenator on the rutting performance was analyzed. Three different MSCR tests were conducted considering different stress levels and creep recovery cycles, including test conditions of AASHTO T 350. The results indicated that AASHTO T 350 can grade the binders based on the nonrecoverable creep compliance and stress sensitivity parameters. Since SBS modified binders always have lower Jnr values at lower stress levels, higher stress levels and more creep recovery cycles are recommended to better evaluate the rutting resistance of binder. The addition of RAP decreased the Jnr values while the addition of rejuvenator had the opposite effect. The added SBS modified binder and rejuvenator have a negligible effect on the percentage recovery. It is suggested that a suitable rejuvenator dosage and virgin binder type should be chosen carefully to guarantee the rutting performance of RAP binder.

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.

scholarly journals Multiple Stress Creep Recovery (MSCR) Test for Determination of Waste Engine Oil Modified Asphalt Binder as Pavement Material

2022 ◽  
pp. 8-14
Author(s):  
Biruk Tadele ◽  
Emer T Quezon
Keyword(s):  
Asphalt Binder ◽  
Engine Oil ◽  
Creep Recovery ◽  
Multiple Stress ◽  
Modified Asphalt ◽  
Waste Engine Oil ◽  
Modified Asphalt Binder ◽  
Multiple Stress Creep Recovery ◽  
Modified Binder ◽  
Pavement Material

Engineers have been using modified binders to improve the quality of flexible pavements. The use of waste material is one of the solutions taken in this direction. It is for this ground that the studies emphasis on the evaluation of waste engine oil as a modifier for asphalt binder as a pavement material. In the study uses four samples extracted from 80/100 penetration grade bitumen. From four sample first sample was checked for weather requirements of asphalt binder meet or not and the three were modified with different content of engine oil (3,6 and 9%). The behaviors of both unmodified and modified binder were checked for rheological properties. Dynamic shear rheometer (DSR) was used to determine high temperature performance grade (PG) and multiple stress creep recovery tests to determine rutting resistance properties of the binder. PG analysis indicates that both aged and un-aged 3% and 6% modified binder have similar higher PG grade with the unmodified one and 9% modified to have lower PG vale. Jnr3.2 value of modified asphalt binder is lower than unmodified binder indicating that modification had improved the rutting resistance and design traffic load (ESALS). The study shows that it is possible to use waste engine oil-modified binder as a pavement material.

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.

scholarly journals Use of Plastic Wastes and Reclaimed Asphalt for Sustainable Development

2020 ◽  
Vol 15 (2) ◽  
pp. 182-196
Author(s):  
Umar Hayat ◽  
Abdur Rahim ◽  
Ammad Hassan Khan ◽  
Zia Ur Rehman
Keyword(s):  
Polyethylene Terephthalate ◽  
Asphalt Pavement ◽  
Reclaimed Asphalt Pavement ◽  
Gravimetric Analysis ◽  
Reclaimed Asphalt ◽  
Air Voids ◽  
Plastic Wastes ◽  
The Face ◽  
Modified Binder ◽  
Marshall Stability

The increased cost of virgin material, declining resources and increasing plastic wastes have turned the research momentum towards sustainable and green pavements. Reclaimed Asphalt Pavement (RAP) from the construction industry and plastic wastes disposal is the main problem for Pakistan as well as other developing countries in the face of fewer funds for the construction, repair, and rehabilitation of the extensive road network. In this research, the attempt has been made to study the use of Reclaimed Asphalt Pavement and plastic wastes to counter these issues. Virgin binder was modified with three different contents (2%, 4%, and 6%) of Polyethylene Terephthalate and three contents (20%, 30%, and 40%) of Reclaimed Asphalt Pavement. Conventional properties of the modified binder were determined by penetration and softening point. At the same time, thermal stability was checked by Thermal Gravimetric Analysis, and resistance against rutting was evaluated with the help of Dynamic Shear Rheometer. It is observed that modified binder remains stable up to a temperature of 470 °C and showed improved resistance against rutting. Marshall mix properties were determined and compared to specifications of the National Highway Authority of Pakistan. Optimum Marshall stability was observed with 4% Polyethylene Terephthalate, and 30% Reclaimed Asphalt Pavement, while flow and air voids remained in limits. As per the results, utilisation of plastic wastes in asphalt pavements enhances the performance and helps to reduce the environmental pollution and landfill problems due to Reclaimed Asphalt Pavement and plastic wastes.

scholarly journals The use of multiple stress creep recovery test to characterize polymer modified bitumen

2020 ◽  
Vol 66 (3) ◽  
pp. 23-31
Author(s):  
Andrija GraŠić ◽  
Marko Orešković ◽  
Goran Mladenović
Keyword(s):  
High Temperatures ◽  
Creep Recovery ◽  
Modified Bitumen ◽  
Rutting Resistance ◽  
Recovery Test ◽  
Multiple Stress ◽  
Stress Levels ◽  
Multiple Stress Creep Recovery ◽  
Polymer Modified Bitumen

The paper analyzes the performance of polymer modified bitumen due to multiple stress creep recovery (MSCR). This phenomenon is of great importance when considering binder’s performance related to rutting resistance on high temperatures during exploitation period. The paper presents testing results of five polymer modified bitumen samples, obtained by two producers, tested under same temperature and stress levels. Finally, bitumen samples are classified under new MSCR specification, according to SUPERPAVE methodology.

scholarly journals Interactions between RAP and virgin asphalt binders in field, plant, and lab mixes

2022 ◽  
Vol 13 (1) ◽  
pp. 231-249
Author(s):  
Eslam Deef-Allah ◽  
Magdy Abdelrahman
Keyword(s):  
Asphalt Binder ◽  
Chemical Properties ◽  
The United States ◽  
Asphalt Binders ◽  
Creep Recovery ◽  
Reclaimed Asphalt Pavement ◽  
Asphalt Mixes ◽  
Reclaimed Asphalt ◽  
Multiple Stress Creep Recovery ◽  
Materials Used

Reclaimed asphalt pavement (RAP) has been used in asphalt mixes for several years in the United States. However, the interactions between the RAP binder and the virgin asphalt binder (VAB) need further investigations. Thus, the main objective of this study was to explore the rheological and chemical properties of extracted asphalt binders (EABs) from plant, field, and lab mixes. The plant mixes were collected from behind the paver, reheated to the compaction temperature, and compacted in the lab. The field mixes were collected as cores within two weeks after the end of the construction process. The lab mixes were fabricated in the lab using the same materials used in the plant and field mixes. The mixes contained high asphalt binder replacement percentages by RAP, which were greater than 30%. The EABs were treated as rolling thin film oven aged VABs (RTFO AVABs). The rheological properties of EABs and RTFO AVABs were analyzed using temperature sweep, frequency sweep, and multiple stress creep recovery tests. Chemical investigations of EABs and RTFO AVABs were carried out using Fourier transform infrared spectroscopy and thermogravimetric analysis. The EABs from plant or lab mixes showed higher stiffnesses than EABs from field mixes. This occurred because of the extra heating that was implemented for the plant mixes before the compaction in the lab, which caused more interactions between the RAP binder and VABs. The fabrication mechanism, mixing and short-term aging processes, used in lab mixes caused more interactions between RAP binder and VABs than in the field mixes.

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