Microstructure analysis and mechanical performance of crumb rubber modified asphalt concrete using the dry process

Rodríguez-Fernández, Israel; Baheri, F. Tarpoudi; Cavalli, Maria Chiara; Poulikakos, Lily D.; Bueno, Moisés

doi:10.1016/j.conbuildmat.2020.119662

Cited by 61 publications

(20 citation statements)

References 28 publications

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“…From the environmental stand point, this alternative has been seen to be attractive, yet, it has not been extensively adopted because its implications on road life cycle cost and performance have not been conclusively established (Ganiron, 2014). The two different techniques adopted in incorporating these wastes are: 1) the wet process and 2) the dry process (Rodríguez-Fern andez et al, 2020;Tahami et al, 2019). In the wet process, CR play the role of a binder modifier, whereas in the dry process, CR and/or granulated rubber is utilized in the replacement of the fines (Sun et al, 2020).…”

Section: Waste Rubber Tire Utilizationmentioning

confidence: 99%

Waste materials in highway applications: An overview on generation and utilization implications on sustainability

Bamigboye

Bassey

Olukanni

et al. 2021

Journal of Cleaner Production

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The rate at which the construction industry explores and consumes non-renewable natural aggregates and other industrial products such as bitumen, lime, and cement during construction and rehabilitation of road pavements has over time proven to be environmentally degrading and non-sustainable. This, alongside the issues of high solid waste generation and inadequate disposal, has led to series of studies by various researchers to find methods to integrate these solid wastes as alternative materials in road construction and maintenance. This paper provides a simple yet detailed review of recent relevant studies conducted to understand the alarming rate of generation and the effects of reusing these waste materials in both flexible and rigid pavements. The review further outlines the advantages and disadvantages of the selected waste materials and compare the results with that of conventional materials in accordance with relevant standards while highlighting the performance, and life cycle environmental and economic sustainability implications. The study shows that the adoption of these materials offers efficiency in waste disposal while reducing the demand for natural aggregates and consequently, significantly reducing life cycle impacts and costs. The challenges limiting the effective practical implementation of these waste recycling techniques in the construction industry were discussed and possible solutions were suggested to encourage and ensure its utilization in road construction.

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Section: Waste Rubber Tire Utilizationmentioning

confidence: 99%

Waste materials in highway applications: An overview on generation and utilization implications on sustainability

Bamigboye

Bassey

Olukanni

et al. 2021

Journal of Cleaner Production

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“…Further, the water in the air-water film attached to the rubber particles was found to participate in the hydration reaction with the cementitious materials, thereby contributing towards the optimization of the pore structure of the concrete [41]. Moreover, the random distribution of the hybrid fibers in the cement matrix effectively reduces the penetrating cracks before they harden, preventing the formation of communication pores.…”

Section: Mesostructure Analysismentioning

confidence: 99%

Study on Mechanical Properties and Pore Structure of Hybrid Fiber Reinforced Rubber Concrete

et al. 2021

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In this work, to reduce the probability of brittle failure in the support structure of deeply buried high-stress soft rock roadways, hybrid-fiber reinforced rubber concrete (HFRRC) was investigated using the orthogonal test, and the effects of various factors on the performance were studied. The mechanical properties, pore structure, and microstructure of rubber concrete reinforced by basalt fiber (BF) and polyvinyl alcohol fiber (PF) were studied from macroscale, mesoscale, and microscale perspectives. The results revealed that the content of the rubber particles has a significant impact on strength. Further, the addition of the hybrid fibers to the concrete was found to have a positive effect on the splitting tensile strength and the flexural strength. However, no significant effect was observed on the compressive strength. Furthermore, it was found that the content of BF and PF have a significant impact on the energy dissipation capacity and ductility, and the influence of the PF content is greater than that of the BF content. The concrete with 10% rubber particles of 1–3 mm, a volume fraction 0.3% basalt fiber, and a volume fraction 0.2% polyvinyl alcohol fiber was obtained as the optimal mix proportions. Moreover, it was found that the random distribution of the rubber particles and the hybrid fibers optimized the pore structure, inhibited the expansion of the cracks, and reduced the brittleness of the concrete. The findings of this study can provide a useful reference for the application of an environmentally friendly material with recycled rubber aggregate and hybrid fiber.

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“…Then, the preheated binder (160 • C) was added and mixed with the aggregates and CR for another 2 min. The loose mixture was then placed in the oven at 165 • C for 120 min (conditioning time) [33]. Afterwards, cylindrical samples were produced by Marshall compaction at 155 • C.…”

Section: Asphalt Mixture Preparation and Aging Proceduresmentioning

confidence: 99%

“…In order to assess the performance of the different asphalt mixtures, a developed experimental protocol [33] was selected. The laboratory tests carried out were as follows:…”

Section: Characterization Testsmentioning

confidence: 99%

Recyclability of Asphalt Mixtures with Crumb Rubber Incorporated by Dry Process: A Laboratory Investigation

et al. 2020

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Semi-Dense Asphalt (SDA) mixtures are nowadays recommended for the surface layer of low noise roads in urban areas due to their optimal functional characteristics. Moreover, the use of polymer-modified bitumen (PmB) in its design results in high mechanical performance. However, this type of highly modified bitumen implies significant economic and environmental disadvantages. The polymer modification increases the production cost, involves higher mixing temperatures, and makes the recycling process of the asphalt mixtures challenging. As a potential alternative to PmB in SDA mixtures, this experimental work analyses the dry process for the incorporation of crumb rubber (CR) from waste tires. Particularly, the main objective was to study the aging effect and the recyclability of asphalt mixtures prepared in the laboratory with two different types of CR. The volumetric properties and mechanical performance of the mixtures artificially aged and rejuvenated were evaluated. The results obtained show that mixtures with CR have adequate performance, being less susceptible to aging than a conventional polymer-modified mixture. Furthermore, the rheological response of asphalt binder samples recovered from the mixtures at different aging states was analyzed. It was observed that the effect of the rejuvenator depended on the CR type, but this fact did not negatively influence the performance of the recycled mixtures.

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Microstructure analysis and mechanical performance of crumb rubber modified asphalt concrete using the dry process

Cited by 61 publications

References 28 publications

Waste materials in highway applications: An overview on generation and utilization implications on sustainability

Waste materials in highway applications: An overview on generation and utilization implications on sustainability

Study on Mechanical Properties and Pore Structure of Hybrid Fiber Reinforced Rubber Concrete

Recyclability of Asphalt Mixtures with Crumb Rubber Incorporated by Dry Process: A Laboratory Investigation

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