Influence of Reclaimed Asphalt Pavement (RAP) Aggregate Fraction on the Determination of Active Binder Content

2021 ◽  
Author(s):  
M. Thirumalavenkatesh ◽  
V. T. Thushara
Keyword(s):  
Asphalt Pavement ◽  
Binder Content ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Aggregate Fraction

scholarly journals A Method to Quantify Reclaimed Asphalt Pavement Binder Availability (Effective RAP Binder) in Recycled Asphalt Mixes

2019 ◽  
Vol 2673 (1) ◽  
pp. 205-216 ◽  
Author(s):  
Fawaz Kaseer ◽  
Edith Arámbula-Mercado ◽  
Amy Epps Martin
Keyword(s):  
Asphalt Pavement ◽  
Economic Benefits ◽  
Binder Content ◽  
Mix Design ◽  
Void Content ◽  
Reclaimed Asphalt Pavement ◽  
Asphalt Mixes ◽  
Reclaimed Asphalt ◽  
State Highway ◽  
Asphalt Mix

State highway agencies recognize the environmental and economic benefits of utilizing reclaimed asphalt pavement (RAP) in asphalt mixes. Currently, most agencies assume all of the RAP binder content is available for mix design purposes. However, the percentage of available or effective RAP binder in the asphalt mix is usually less than 100% and not quantified, which could yield dry asphalt mix with a high air void content, potentially leading to premature distress. The term available or effective RAP binder refers to the binder that is released from the RAP, becomes fluid, and blends with virgin binder under typical mixing temperatures. This study proposes a method to estimate the RAP binder availability factor (BAF) which can be used to adjust the virgin binder content in RAP mixes to ensure that the mix design optimum binder content is achieved. In this method, asphalt mixes were prepared so that, after mixing and conditioning, the RAP material can be separated from the virgin aggregate, which allows for a thorough evaluation of the extent of RAP binder availability in the asphalt mix. This method was verified in a preliminary experiment and then used to estimate the BAF of RAP from different sources, and a correlation between RAP BAF and the high temperature performance grade (PG) of each RAP source was established. Finally, factors affecting the RAP BAF were also evaluated such as mixing temperature, conditioning period, the use of recycling agents (or rejuvenators), and the method of adding the recycling agent to the mix.

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.

Evaluation of Recycled Aggregate (RAP) Presence Impact under Indirect Tensile Strength of Bitumen Stabilized Mix with Foamed Asphalt for a Base Layer

2020 ◽  
Vol 841 ◽  
pp. 108-113
Author(s):  
Marcos Ariel Villanueva Guzmán ◽  
Horacio Delgado Alamilla ◽  
Elia Mercedes Alonso Guzmán ◽  
Wilfrido Martínez Molina ◽  
Hugo Luis Chávez García ◽  
...  
Keyword(s):  
Asphalt Pavement ◽  
Recycled Aggregate ◽  
Base Layer ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Aggregate Fraction ◽  
Foamed Asphalt ◽  
Different Types ◽  
Indirect Tensile ◽  
Foamed Bitumen

Foamed bitumen improves the properties of base layer, increasing the number of equivalent axles allowed, as result of this is a durable pavement. To achieve this, base layer’s design must count with an amount of filler, to increase the stony aggregate fraction. This research consists with two different types of filler, lime and cement, 1% in dosage respect to the stony aggregate weight. Has been discovered now, that the RAP (reclaimed asphalt pavement) aggregate in addition to mitigate environmental problems, has a significant impact value on the mechanic resistance of the mix.

Effect of Partial Blending on High Content Reclaimed Asphalt Pavement (RAP) Mix Design and Mixture Properties

2018 ◽  
Vol 2672 (28) ◽  
pp. 79-87 ◽  
Author(s):  
Shuai Yu ◽  
Shihui Shen ◽  
Xuli Zhou ◽  
Xinghai Li
Keyword(s):  
Design Method ◽  
Asphalt Pavement ◽  
Binder Content ◽  
Reclaimed Asphalt Pavement ◽  
Reclaimed Asphalt ◽  
Blending Method ◽  
Cracking Performance ◽  
Pavement Construction ◽  
Wheel Tracking ◽  
The Impact

Reclaimed Asphalt Pavement (RAP) material, especially high RAP content mixture, is nowadays receiving more interest in asphalt pavement construction. When determining the optimum asphalt content (OAC) in RAP mixture design, RAP partial blending is sometimes neglected and total blending is assumed. Such an assumption influences the virgin binder content determination and can contribute to the poor fatigue and cracking performance of high RAP pavement in the field. This paper studied the impact of RAP partial blending on the OAC of mixtures with varied RAP content up to 40%. A Laboratory Hamburg Wheel Tracking Test, an IDT fracture test, and an SCB test were performed on mixtures designed by different methods to evaluate rutting and cracking performance. In particular, a partial blending design method was proposed to improve the mixture performance by adjusting the virgin binder content through the RAP blending ratio. It was found that the optimum virgin binder content decreased as the RAP content increased; the Superpave volumetric method required the lowest OAC while the partial blending method required the highest OAC. The rutting performance of the RAP mixtures considering partial blending was slightly lower than other mixtures. However, all RAP mixtures showed better rutting resistance than virgin mixtures. The cracking performance of the high RAP mixtures was significantly improved if the partial blending effect was considered in the design.

scholarly journals Combining Reclaimed Asphalt Pavement (RAP) and Recycled Concrete Aggregate (RCA) from Cuba to Obtain a Coarse Aggregate Fraction

2020 ◽  
Vol 12 (13) ◽  
pp. 5356 ◽  
Author(s):  
Jessika Morales Fournier ◽  
Debora Acosta Álvarez ◽  
Anadelys Alonso Aenlle ◽  
Antonio José Tenza-Abril ◽  
Salvador Ivorra
Keyword(s):  
Hot Mix Asphalt ◽  
Coarse Aggregate ◽  
Asphalt Pavement ◽  
Recycled Concrete ◽  
Construction And Demolition Waste ◽  
Reclaimed Asphalt Pavement ◽  
Demolition Waste ◽  
Reclaimed Asphalt ◽  
Aggregate Fraction ◽  
The Impact

In Cuba, tons of construction and demolition waste (CDW) are generated during urban construction and reconstruction activities every year. The use of CDW, such as recycled concrete aggregates (RCA) and reclaimed asphalt pavement (RAP), in pavement construction is a viable solution to preserve the consumption of natural aggregates (NA), and to minimize the impact of landfill. The main objective of this work is to obtain a 5–10 mm aggregate fraction of RCA and RAP, to obtain an appropriate recycled coarse aggregate for manufacturing hot mix asphalt (HMA). Each source of RCA, RAP and NA, and the combinations RCA/RAP (0/100, 25/75, 50/50, 75/25 and 100/0) were characterized (moisture, asphalt content of RAP, specific gravity, water absorption, and flakiness index) for determining a better combination. The results showed that the combination (RCA/RAP) that best meets the NA aggregates specifications used for hot mix asphalt were RCA/RAP: 25/75 and 50/50. The results show the possibility of combining both wastes to obtain a coarse aggregate fraction with a high environmental benefit, by reducing the use of natural resources.

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