Investigation of Foamed Bitumen Mixes Using Reclaimed Asphalt Pavement Materials for Cold Recycling Technology

Bangi, Mugume Rodgers

doi:10.1007/s42947-021-00014-4

Cited by 5 publications

(13 citation statements)

References 13 publications

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“…It should be noted from Figure 9 that the Marshall stability of emulsified and foamed asphalt CRM with RAP before and after water immersion would decrease with the increase in asphalt content, and the residual Marshall stability (M 0 ) would linearly decrease with the rise in asphalt content. This phenomenon could be explained by the fact that the increase in asphalt content would result in more free asphalt which leads to instability of CRM due to the lubricating effect of the excess asphalt causing a lower angle of friction [34].…”

Section: Water Immersion Marshall Stability Test Resultsmentioning

confidence: 99%

“…High temperature stability is used to evaluate the durability and ascertain the structural capacity of HMA [34]. Rutting tests were conducted to reflect the resistance of CRMs to deformation at high temperatures.…”

Section: High Temperature Rutting Test Resultsmentioning

confidence: 99%

“…The most common stabilization agents include emulsified asphalt, foamed asphalt, and cement [14,20,21]. Factors influencing the volumetric and mechanical properties of CRM were intensively investigated by many researchers, e.g., curing time and temperature [22][23][24], compacting method [25], cement content and type [26][27][28][29][30], RAP source and content [31,32], asphalt content [27,[33][34][35], gradation [21,25,36], water content [28,37], rejuvenator content [38], additive or active fillers [18,19,39,40], asphalt type, and extra aggregates [41]. At the same time, the effect of RAI or composite RAP/RAI on the performance, mechanical behavior, and small strain characteristic of CRM stabilized by emulsified asphalt or cement has been studied by many scholars [42,43].…”

Section: Introductionmentioning

confidence: 99%

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Study on Cold Recycled Asphalt Mixtures with Emulsified/Foamed Asphalt in the Laboratory and On-Site

Zhao

Su²,

Su³

et al. 2022

Coatings

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Millions of tons of reclaimed asphalt pavement (RAP) and reclaimed aggregate or reclaimed inorganic binder stabilized aggregate (RAI) is produced every year in China. The cold recycled mixture (CRM) technology reduces fuel consumption, emissions, and cost and utilizes the high content of RAP. In this paper, six types of CRM with varying RAP/RAI composition and asphalt binders were investigated. The laboratory tests included strength indicators, high temperature stability, low temperature crack resistance, water stability, and dynamic modulus. A full-scale trial section was constructed after the laboratory tests. Except for low temperature failure strain without secondary compaction in the mixture design, test results illustrated that the performances of different CRMs met the specifications. The cement addition limited the thermo-viscoelastic behavior of the CRM. The RAI contents had reduced the water sensitivity of CRM, and the emulsified asphalt CRM had better performance than the foamed asphalt CRM. The performances of samples cored from the test section in the field met the specifications and were lower than that in the laboratory. The curing conditions in the field were not as effective as in the laboratory. The curing conditions and compaction method should simulate the conditions in the field to guide the CRM selection and mixture design.

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Section: Water Immersion Marshall Stability Test Resultsmentioning

confidence: 99%

Section: High Temperature Rutting Test Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Study on Cold Recycled Asphalt Mixtures with Emulsified/Foamed Asphalt in the Laboratory and On-Site

Zhao

Su²,

Su³

et al. 2022

Coatings

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“…The reason for this choice is that once the remaining layers of the pavement are strengthened to provide structural stability, any type of future and/or regular interventions can be focused on the upper pavement layers to restore serviceability, an approach that considers feasibility and cost effectiveness. Indeed, there is literature evidence that for severely damaged pavements requiring extensive rehabilitation, FA can be considered as a promising option to stabilize the base course [3,14,15].…”

Section: Introductionmentioning

confidence: 99%

“…In addition, the incorporation of cement as filler into the FA mixtures has been considered as necessary to reduce the moisture susceptibility. Mugume [15] reported that cement rates lower than 0.5% are in general non-preferable. Therefore, it can be stated that the reduced susceptibility to frost and moisture damage of properly designed mixtures coupled with the stabilization contribution of FA raise the sustainability and the suitability of the FDR-FA technique versus a non-stabilized FDR technique.…”

Section: Introductionmentioning

confidence: 99%

Structural Performance of Foamed Asphalt Base in a Full Depth Reclaimed and Sustainable Pavement

2023

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Environmental awareness and budgetary constraints in road construction and rehabilitation require innovative and at the same time environmentally friendly solutions in favor of resource conservation, in any type of pavement intervention. In the meantime, surface interventions in severely deteriorated pavements are insufficient, increasing as such the recycling potential of existing materials in Full Depth Reclamation (FDR). This study addresses the efficiency of an FDR process in which the recycled base course of an existing semi-rigid pavement is stabilized with Foamed Asphalt (FA). The adverse effects of FA curing, which have a significant impact on pavement evaluation, particularly in the early stages of a pavement’s life cycle, prompted the conduct of a comprehensive testing campaign at two different periods, shortly after pavement rehabilitation and five years thereafter. The campaign included nondestructive testing at the aforementioned periods using Ground Penetrating Radar (GPR) and the Falling Weight Deflectometer (FWD), which facilitate the structural evaluation of the FA base. Using the collected nondestructive testing data, the principles of Multi-Layer Elastic Theory (MLET) and Genetic Algorithms (GA) are used to investigate the performance of the FA base. Both analysis tools captured the FA strength increase in the second period, but an increased variance of the FA modulus was observed mainly in the first test period, probably due to the curing effect. In addition, GA showed an advantage over other, more conventional tools for back-analysis of pavement stiffness, resulting in an interesting correlation potential of FA modulus to a deflection-based parameter reflecting the condition of the FA layer. Overall, the study contributes to the development of a practical methodology suitable for the evaluation of non-conventional and sustainable pavement structures.

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A review of full-depth reclamation of pavements with Portland cement: Brazil and abroad

Fedrigo

Núñez

Visser

2020

Construction and Building Materials

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Investigation of Foamed Bitumen Mixes Using Reclaimed Asphalt Pavement Materials for Cold Recycling Technology

Cited by 5 publications

References 13 publications

Study on Cold Recycled Asphalt Mixtures with Emulsified/Foamed Asphalt in the Laboratory and On-Site

Study on Cold Recycled Asphalt Mixtures with Emulsified/Foamed Asphalt in the Laboratory and On-Site

Structural Performance of Foamed Asphalt Base in a Full Depth Reclaimed and Sustainable Pavement

A review of full-depth reclamation of pavements with Portland cement: Brazil and abroad

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