scholarly journals Use of recycled asphalt in the bituminous base course

2012 ◽  
Vol 64 (5) ◽  
pp. 395-401 ◽  
Keyword(s):  
Recycled Asphalt ◽  
Base Course

scholarly journals Long-Term Performance of Pavement Structures with Cold In-Place Recycled Base Course

2021 ◽  
Vol 16 (2) ◽  
pp. 48-65
Author(s):  
Audrius Vaitkus ◽  
Judita Gražulytė ◽  
Andrius Baltrušaitis ◽  
Jurgita Židanavičiūtė ◽  
Donatas Čygas
Keyword(s):  
Asphalt Pavement ◽  
Asphalt Mixture ◽  
Asphalt Pavements ◽  
Recycled Asphalt ◽  
Binding Agents ◽  
Pavement Structure ◽  
Pavement Structures ◽  
Base Course ◽  
Surface Distress ◽  
Foamed Bitumen

Properly designed and maintained asphalt pavements operate for ten to twenty-five years and have to be rehabilitated after that period. Cold in-place recycling has priority over all other rehabilitation methods since it is done without preheating and transportation of reclaimed asphalt pavement. Multiple researches on the performance of cold recycled mixtures have been done; however, it is unclear how the entire pavement structure (cold recycled asphalt pavement overlaid with asphalt mixture) performs depending on binding agents. The main objective of this research was to evaluate the performance of cold in-place recycled asphalt pavements considering binding agents (foamed bitumen in combination with cement or only cement) and figure out which binder leads to the best pavement performance. Three road sections rehabilitated in 2000, 2003, and 2005 were analysed. The performance of the entire pavement structure was evaluated in terms of the International Roughness Index, rut depth, and pavement surface distress in 2013 and 2017.

scholarly journals Case Study on the Effect of Recycled Asphalt Layer Parameters on the Bearing Capacity of the Pavement

2020 ◽  
Vol 15 (5) ◽  
pp. 45-58
Author(s):  
Atis Zariņš
Keyword(s):  
Structural Parameters ◽  
Economic Benefits ◽  
Design Stage ◽  
Recycled Asphalt ◽  
Reclaimed Asphalt ◽  
The Road ◽  
Base Course ◽  
Artificial Neural Network Ann ◽  
Analytical Approaches

Numerous ways to use recycled asphalt (RA) in the road base course will provide both environmental and economic benefits, allowing to recycle and utilise this initially waste material in road or pavement reconstruction projects. However, the properties and parameters of RA necessary for the application of reclaimed asphalt pavement (RAP) in a new pavement structure in most cases are not detectable in the design stage, which complicates design and construction process. The purpose of this paper is to study possibilities for evaluating the performance and parameters of RA, as well as to review the possibilities, methods and applications for RA testing. Data for this case study were obtained from recently completed road structures in the form of FWD measurements, together with lab explored parameters of drilled pavement cores. Based on that data, the relationships between the main pavement structural parameters, such as modulus on the surface of the pavement, compressive strength of RA core segment, thickness of bound layers and back calculated modulus were examined. On the way to exploring different analytical approaches, two approximation models were developed and compared, using the obtained data: by directly approximating the obtained data and after processing them with artificial neural network (ANN).

Research on Shrinking Performance of Recycled Asphalt Pavement Material Stabilized with Inorganic Binder

2015 ◽  
Vol 727-728 ◽  
pp. 25-29
Author(s):  
Bo Peng ◽  
Wen Ying Li ◽  
Guang Kai Yin ◽  
Zhi Hao Cheng
Keyword(s):  
Fly Ash ◽  
Asphalt Pavement ◽  
Recycled Asphalt Pavement ◽  
Recycled Asphalt ◽  
Inorganic Binder ◽  
Different Types ◽  
Dry Shrinkage ◽  
Erosion Properties ◽  
Base Course ◽  
Test Result

This paper studies on shrinkage performance of recycled asphalt pavement (RAP) material blended with inorganic binder such as cement, lime-fly ash (lime and fly ash) and three ashes (cement, lime and fly ash), with certain intensity used as base course. The erosion, dry shrinkage and temperature shrinkage tests were conducted on the recycled asphalt pavement (RAP) material blended with the three kinds of inorganic binder, to evaluate and compare different types of cold recycled inorganic material shrinkage resistance capability and anti-erosion properties. After analyzing the fatigue test result of three-additives-stabilized recycled mixture, it showed that the recycled pavement mixture owned preferable anti-erosion properties, anti-temperature shrinkage resistance and anti-dry shrinkage performance.

scholarly journals Investigation of the Effect of Recycled Asphalt Pavement Material on Permeability and Bearing Capacity in the Base Layer

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Ayşegül Güneş Seferoğlu ◽  
Mehmet Tevfik Seferoğlu ◽  
Muhammet Vefa Akpınar
Keyword(s):  
Bearing Capacity ◽  
Asphalt Pavement ◽  
Linear Increase ◽  
Base Layer ◽  
Sieve Analysis ◽  
Recycled Asphalt Pavement ◽  
Recycled Asphalt ◽  
Suitable Material ◽  
Base Course ◽  
Aggregate Base

The purpose of this research was to investigate the effects of recycled asphalt pavement (RAP) and cement content on the permeability and bearing capacity characteristics of aggregate base courses. Mixtures containing untreated RAP ranging between 0 and 100 percent and 1, 2, and 3% cement-treated RAP were subjected to laboratory tests (bitumen content, sieve analysis, modified proctor, soaked California bearing ratio (CBR), and constant-level permeability tests). The results showed that, as the RAP percentage in the mixture increased, CBR values decreased considerably. Moreover, there is a linear increase in the CBR values with cement treatment. Optimum moisture contents (OMC) and maximum dry densities (MDD) showed a decreasing trend. Increasing the cement percentages in 100% RAP blend increases the OMC and MDD values. The permeability of RAP showed a decrease as the percentage of RAP and cement increased in blends. The study showed that the CBR value of the 20% RAP blend is also obtained in the 100% RAP/3% cement-treated blend. Thus, it has been understood that cement is a suitable material in order to increase the use of RAP. In addition, the increase in the percentage of RAP and cement made the base course more impermeable.

scholarly journals Cold Recycled Asphalt Mixture using 100% RAP with Emulsified Asphalt-Recycling Agent as a New Pavement Base Course

2020 ◽  
Vol 2020 ◽  
pp. 1-11 ◽  
Author(s):  
Wilson Unger Filho ◽  
Luis Miguel Gutiérrez Klinsky ◽  
Rosângela Motta ◽  
Liedi Légi Bariani Bernucci
Keyword(s):  
Tensile Strength ◽  
Heavy Traffic ◽  
Curing Time ◽  
Recycled Asphalt ◽  
Promising Alternative ◽  
Asphalt Mix ◽  
Recycling Agent ◽  
Base Course ◽  
Pavement Base ◽  
Emulsified Asphalt

The rehabilitation process of asphalt pavements using the technique of milling and filling can cause several environmental problems due to either the disposal of the milled asphalt mix or the exploration of natural resources. One alternative to mitigate these impacts is to reuse this milled material, known as reclaimed asphalt pavement (RAP), in the construction of new pavement layers. Within the several available techniques to reuse the RAP, cold recycling using an emulsified asphalt-recycling agent has shown great potential. The aim of this study is to evaluate the application of a cold recycled asphalt mix using 100% RAP with an emulsified asphalt-recycling agent as a new pavement base course. A trial section was built employing this material as a pavement base course in a heavy traffic highway in Brazil, and its structural behavior was monitored for 12 months using a Falling Weight Deflectometer (FWD) to assess its performance over time. Furthermore, a laboratory-testing program was performed to evaluate the recycled mixture stiffness and strength through resilient modulus and indirect tensile strength tests. These tests were used to investigate the influence of the storage interval (7, 14, and 28 days) considering the time between mixing and compaction of the mixture. The effect of the curing time after compaction (1, 3, 7, 26, and 56 days) was also assessed. It was verified in laboratory and in the trial section that the stiffness increases with curing time. Furthermore, the backcalculated elastic resilient moduli indicated values in the same order of magnitude to those obtained in the laboratory tests. In addition to the laboratory test findings, it was also observed that the longer the period of storage, the higher the values of stiffness and tensile strength for short periods of curing. This behavior was not verified when longer curing periods were used. In general, the use of cold recycled asphalt mixtures as base course of new pavements proved to be a promising alternative to reuse RAP.

Louisiana Experience with Foamed Recycled Asphalt Pavement Base Materials

2003 ◽  
Vol 1832 (1) ◽  
pp. 17-24 ◽  
Author(s):  
Louay N. Mohammad ◽  
Murad Y. Abu-Farsakh ◽  
Zhong Wu ◽  
Chris Abadie
Keyword(s):  
Asphalt Pavement ◽  
Construction Materials ◽  
Field Tests ◽  
Field Evaluation ◽  
Concrete Pavement ◽  
Recycled Asphalt Pavement ◽  
Recycled Asphalt ◽  
Base Course Material ◽  
Experimental Base ◽  
Base Course

Utilization of existing recyclable materials has always been key to more efficient and economical highway construction. Use of the foamed-asphalt (FA) technique to stabilize recycled asphalt pavement (RAP) is one strategy for an efficient use of salvaged construction materials. The main objective of this study is to investigate the potential use of FA-treated RAP as a base course material in lieu of a crushed-limestone base beneath a concrete pavement layer. Test sections were constructed at US-190 near Baton Rouge, Louisiana, and used for field evaluation of the FA RAP base. The laboratory mixture design of the FA RAP, the construction of the experimental base section, and the field evaluation of the stiffness of the FA RAP base layers using different in situ testing devices are presented. Preliminary results of both laboratory and field tests showed that the FA-treated RAP mixtures are very promising and can be used as an alternative to the traditional limestone base beneath a concrete pavement layer.

Cement Content of Durability Cement Stabilized Macadam Base Course in Seasonal Freezing Zone

CICTP 2020 ◽  
2020 ◽  
Author(s):  
Junchen Ma ◽  
Chunyu Liang ◽  
Ying Wang ◽  
Lidong Zhang ◽  
Weiwu Cui ◽  
...  
Keyword(s):  
Cement Content ◽  
Seasonal Freezing ◽  
Base Course
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