Study of warm mix asphalt using reclaimed asphalt pavement and copper slag: a review

2020 ◽  
Vol 47 (4) ◽  
pp. 355-362 ◽  
Author(s):  
Ishfaq Mohi ud Din ◽  
Mohammad Shafi Mir
Keyword(s):  
Asphalt Pavement ◽  
Road Construction ◽  
Copper Slag ◽  
Warm Mix Asphalt ◽  
Environmental Benefits ◽  
Engineering Properties ◽  
Asphalt Pavements ◽  
Construction Sector ◽  
Pavement Construction ◽  
Work Done

The incorporation of copper slag (CS) in asphalt pavements proves to be a good substitute in replacing the natural aggregates. This reduces pavement construction cost and plays a key role in protecting the environment. The CS can be used with recycled asphalt pavement (RAP) material especially in warm mix asphalt pavements. The use of RAP not only leads to environmental benefits but also considerably saves natural resources and decreases the requirement to use virgin bitumen. The use of CS in pavement construction sector eliminates the disposal as well as leaching problems associated with it. This paper focuses on the review of studies carried out on the use of CS along with RAP in road construction. It presents and discusses the work done on the use of CS in the pavement construction sector and the use of RAP in providing the necessary stiffening effect to the asphalt pavements. It analyzes the requirement and advantage of using CS with RAP in asphalt pavements in light of previous research findings and its influence on various engineering properties in pavements. This paper also reviews the work done to study the environmental impact of using CS in asphalt mixes.

Production, Construction, Properties, and Performance of a Test Road with High Reclaimed Asphalt Pavement Content

2017 ◽  
Vol 2633 (1) ◽  
pp. 37-45
Author(s):  
Jian-Shiuh Chen ◽  
Han-Chang Ho ◽  
Yen-Yu Lin
Keyword(s):  
Asphalt Pavement ◽  
Asphalt Mixtures ◽  
Environmental Benefits ◽  
Engineering Properties ◽  
Asphalt Pavements ◽  
Pavement Performance ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Test Road ◽  
And Performance

The two primary factors that drive the use of reclaimed asphalt pavement (RAP) are economic savings and environmental benefits. However, highway agencies are concerned about the use of a high percentage of RAP in asphalt pavements. This study addressed issues related to the production, construction, properties, and performance of asphalt pavements that contain high percentages of RAP. Mixtures that contained up to 40% RAP were successfully designed, produced, and constructed after proper procedures were followed and attention to detail was paid during design, production, and construction. A separate drum for drying and heating RAP, called a parallel heating system, was used to produce high RAP content asphalt mixtures in a batch plant. Rejuvenating agents were mixed directly in a surge bin to allow the rejuvenator enough time to diffuse into aged RAP binder. Comprehensive laboratory tests were performed to evaluate the air voids, the resilient modulus, the rut depth, and the Cantabro weight loss of asphalt mixtures with high RAP content. A test road was constructed in 2014 to monitor how high RAP asphalt pavements would perform under real traffic and environmental conditions. An in-depth investigation was conducted of pavement performance, including cracking, friction, and rutting. The engineering properties of plant-produced mixtures and field cores were well correlated with the pavement performance of the test road. Test results indicated that high RAP content asphalt mixtures could perform as satisfactorily as those produced with virgin materials to meet in-service requirements.

scholarly journals Utilisation of Waste-Based Geopolymer in Asphalt Pavement Modification and Construction—A Review

2021 ◽  
Vol 13 (6) ◽  
pp. 3330
Author(s):  
Abdalrhman Milad ◽  
Ahmed Suliman B. Ali ◽  
Ali Mohammed Babalghaith ◽  
Zubair Ahmed Memon ◽  
Nuha S. Mashaan ◽  
...  
Keyword(s):  
Asphalt Pavement ◽  
Mine Waste ◽  
Asphalt Mixture ◽  
Environmental Benefits ◽  
Engineering Properties ◽  
Asphalt Binders ◽  
Modified Asphalt ◽  
Low Temperature Cracking ◽  
Pavement Construction ◽  
By Products

The use of geopolymer in pavement constructions is strongly encouraged. Many studies have demonstrated the vast potential of using industrial-by-products-based geopolymers. This paper discusses the modification of asphalt binders with geopolymers, namely geopolymer-modified asphalt (GMA) and geopolymer-modified asphalt mixture (GMAM). In addition, curing geopolymer materials, engineering properties, production techniques, and prospective utilisation in the pavement construction, such as durability and sustainability, are also discussed. The literature review showed that many industrial by-products, including red mud, blast furnace slag, fly ash, and mine waste, are used to produce geopolymers because of the metal components such as silicon and aluminium in these materials. The geopolymers from these materials influence the rheological and physical properties of asphalt binders. Geopolymers can enhance asphalt mixture performance, such as stability, fatigue, rutting, and low-temperature cracking. The use of geopolymers in asphalt pavement has beneficial impacts on sustainability and economic and environmental benefits.

Laboratory Investigation Effect of Warm Mix Additives on the Viscosity of SBS Modified Asphalt

2013 ◽  
Vol 448-453 ◽  
pp. 1329-1332
Author(s):  
Qi Yang Zhu ◽  
Yuan Zhuang ◽  
Guang Wei Hu ◽  
Ye Mao Zhang
Keyword(s):  
Working Conditions ◽  
Warm Mix Asphalt ◽  
Environmental Benefits ◽  
Viscosity Reduction ◽  
Engineering Properties ◽  
Mixing Performance ◽  
Modified Asphalt ◽  
Warm Mix Additives ◽  
Pavement Construction ◽  
Sbs Modified Asphalt

Warm Mix Asphalt (WMA) technology has become increasingly popular in pavement construction because of its environmental benefits and its fine engineering properties. In order to optimize mixing performance of WMA, four kinds of warm mix additives used in China were evulated by viscosity testing. Thus, this paper is mainly to reduce bitumen viscosity, which in turn improves mix workability, produces fewer emissions, and generally creates better working conditions. Results identified that the Sasobit additive has a large viscosity reduction and has a fine workability, and is appropriate for pavement construction.

Prediction of Stiffness of Asphalt Treated with Surfactant-Based Warm-Mix Additive

2012 ◽  
Vol 2293 (1) ◽  
pp. 89-95 ◽  
Author(s):  
Everett Crews ◽  
David T. Newton ◽  
Tejash Gandhi ◽  
Courtney A. Rice
Keyword(s):  
Asphalt Pavement ◽  
Laboratory Data ◽  
The United States ◽  
Warm Mix Asphalt ◽  
Asphalt Binders ◽  
Asphalt Pavements ◽  
Regression Analyses ◽  
Process Variables ◽  
Production Temperature ◽  
Pavement Construction

Although the tonnage of asphalt pavements constructed with warm-mix technologies has increased rapidly in the United States in recent years, some practical aspects of warm-mix asphalt pavement construction remain incompletely defined. For example, compaction temperatures for many warm-mix technologies cannot be estimated with the standard equiviscous methods common to hot-mix asphalt. This paper reports the preliminary results of research to develop a method for predicting the stiffness (G*/sin δ) of binder treated with a surfactant-based warm-mix additive as a function of mix production temperature, mix storage and haul time, and warm-mix additive dosage. Asphalt binders were treated in the laboratory with 0.0%, 0.5%, and 1.0% of surfactant-based warm-mix additive and were heated in a rolling thin-film oven at 130°C, 145°C, and 163°C for 0, 25, 55, 85, and 115 min. Regression analyses of the laboratory data yielded equations that with good fit correlated binder stiffness with the formulation (dosage) and process variables (aging temperature and time). The predictive value of these laboratory-developed equations was found to be good when the measured stiffness of binder extracted from field mix obtained at the paver was compared with binder stiffness calculated with the laboratory-developed equations by using the plant mix temperature, total storage and haul time, and surfactant dosage.

scholarly journals Rutting and moisture-induced damage potential of foamed warm mix asphalt (WMA) containing RAP

2021 ◽  
Vol 6 (3) ◽  
Author(s):  
Mohammad Ashiqur Rahman ◽  
Rouzbeh Ghabchi ◽  
Musharraf Zaman ◽  
Syed Ashik Ali
Keyword(s):  
Asphalt Pavement ◽  
Warm Mix Asphalt ◽  
Environmental Benefits ◽  
Reclaimed Asphalt Pavement ◽  
Chemical Additives ◽  
Flow Number ◽  
Damage Potential ◽  
Asphalt Mixes ◽  
Reclaimed Asphalt ◽  
Wheel Tracking

AbstractDespite significant economic and environmental benefits, performance of warm mix asphalt (WMA) containing reclaimed asphalt pavement (RAP) remains a matter of concern. Among the current WMA technologies, the plant foaming technique (called “foamed WMA” in this study) has gained the most attention, since it eliminates the need for chemical additives. In the present study, the laboratory performance, namely rutting and moisture-induced damage potential of foamed WMA containing RAP were evaluated and compared with those of similar hot mix asphalt (HMA) containing identical amount of RAP. Dynamic modulus, Hamburg wheel tracking (HWT) and flow number tests were performed to assess the rutting resistance of the mixes. Also, stripping inflection point from HWT tests and tensile strength ratio after AASHTO T 283 and moisture induced sensitivity test (MIST) conditioning were used to evaluate the moisture-induced damage of asphalt mixes. It was found that MIST conditioning effectively simulates the moisture-induced damage and can capture the propensity of asphalt mixes to moisture damage more distinctly compared to AASHTO T 283 method due to application of cyclic loadings. The foamed WMA was found to exhibit higher rutting and moisture-induced damage potential due to lower mixing and compaction temperatures compared to HMA. However, the increase in RAP content was found to reduce rutting and moisture-induced damage potential for WMA. Therefore, the lower stiffness of foamed WMA may be compensated with the addition of stiffer binder from RAP.

scholarly journals Recycling Tire Rubber in Asphalt Pavements: State of the Art

2020 ◽  
Vol 12 (21) ◽  
pp. 9076
Author(s):  
Saud A. Alfayez ◽  
Ahmed R. Suleiman ◽  
Moncef L. Nehdi
Keyword(s):  
State Of The Art ◽  
Permanent Deformation ◽  
Engineering Properties ◽  
Asphalt Pavements ◽  
Future Research ◽  
Tire Rubber ◽  
Durability Assessment ◽  
Overall Performance ◽  
Pavement Construction ◽  
Critical Overview

The use of recycled tire rubber in asphalt pavements to improve the overall performance, economy, and sustainability of pavements has gained considerable attention over the last few decades. Several studies have indicated that recycled tire rubber can reduce the permanent deformation of flexible pavements and enhance its resistance to rutting, reduce pavement construction and maintenance costs, and improve the resistance to fatigue damage. This paper provides a systematic and critical overview of the research on and practice of using recycled tire rubber in asphalt pavements in terms of engineering properties, performance, and durability assessment. This critical analysis of the state-of-the-art should enhance the understanding of using recycled tire rubber in asphalt pavements, define pertinent recommendations, identify knowledge gaps, and highlight the need for concerted future research.

Featuring Reclaimed Asphalt Pavement Integration in Warm Mix Asphalt towards Roads Sustainable Development

2013 ◽  
Vol 649 ◽  
pp. 242-245 ◽  
Author(s):  
Alina Mihaela Nicuţă
Keyword(s):  
Sustainable Development ◽  
Energy Saving ◽  
Asphalt Pavement ◽  
Warm Mix Asphalt ◽  
Environmental Benefits ◽  
Transport Infrastructure ◽  
Reclaimed Asphalt Pavement ◽  
Life Cycle Assessment Methodology ◽  
Road Asphalt ◽  
Reclaimed Asphalt

The evaluation of energy savings in the area of transport infrastructure entails a complex characterization of factors, attitudes and consequences. In the frame of energy saving approach, must be identified sustainable alternatives and solutions for road asphalt pavements production and exploitation. Finding innovative materials is one major objective in this process. In the present paper has been carried out an evaluation of the energetically and environmental benefits of warm mix asphalt (WMA) compositions that incorporate reclaimed asphalt pavement (RAP) and their contribution to roads sustainable development. For a proper analysis and reliable results, have been used the Life Cycle Assessment methodology and asPECT software. WMA integrating RAP are known as energy – saving and environmentally friendly asphalt roads pavements. Analyzed in a comparative perspective with hot mix asphalt (HMA) incorporating RAP, WMA would gain in results due to the decrease in mixing and compaction temperature, energy consumption and emissions but also to the increase in durability, quality and performance. The results of this comparison intended to point out an alternative that would provide an increase in the sustainability of the transport infrastructure sector.

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