Effects of Reclaimed Asphalt Pavement aggregates and mineral admixtures on pore structure, mechanical and durability properties of cement mortar

Abraham, Sarah Mariam

doi:10.1016/j.conbuildmat.2019.05.011

Cited by 28 publications

(5 citation statements)

References 38 publications

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“…This can be interpreted by the weakness of the interfacial zone transition that occurred due to the existence of the aged epoxy RAP binder film around the aggregate particles. In addition, although silica fume has been used to provide cement mixes with high compressive strength based on ACI, it does not significantly affect the strength of concrete mixes that contain regular RAP, based on several previous studies [1,4,41]. In this study, utilizing 5% silica fume in epoxy RAP did not significantly affect the compressive strength, which is consistent with including silica fume in concrete mixes with regular RAP.…”

Section: Compressive Strength Test Resultssupporting

confidence: 86%

The Effect of Incorporating 100% of Undiluted and Diluted Reclaimed Epoxy Asphalt Materials into Pervious Cement Mixes

Alamri

Elmagarhe

et al. 2023

Coatings

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In order to improve the sustainability of road pavements, transportation agencies should consider designing pavements with recycled materials such as reclaimed epoxy asphalt pavement. Epoxy asphalt has recently attracted significant attention from the pavement community as a superior-performing binder that can help achieve long-lasting pavements. The recyclability of a proven long-life pavement material, such as epoxy asphalt, has now become one concern in promoting the use of epoxy asphalt binder in road pavements. Due to its thermosetting nature, the usual process of reclaiming asphalt pavement cannot be performed on epoxy asphalt pavement. Recent studies have investigated utilizing reclaimed epoxy asphalt materials in asphalt mixtures as black rock. In light of this, examining the use of reclaimed epoxy materials in cement-concrete mixes is important. The use of reclaimed epoxy asphalt materials in pavement construction is expected to gain more popularity and become a new sustainable construction option in various sustainable pavement applications in the near future. The main objective of this study is to investigate the effects of incorporating 100% reclaimed epoxy asphalt (hereinafter referred to as “epoxy RAP”) and reclaimed diluted epoxy asphalt materials (hereinafter referred to as “diluted epoxy RAP”) into cement-concrete mixes on the performance of the mixtures. The study also examined the effects of replacing cement with 5% silica fume on the performance of reclaimed mixtures. Five different mixtures were fabricated and tested in terms of density, void content, permeability, and compressive strength. Results of the density test revealed that replacing 100% natural aggregates with epoxy RAP and diluted epoxy RAP materials reduced density by an average of 10%. However, void content was found to increase with the incorporation of epoxy RAP, even when replacing Portland cement with silica fume. Regarding permeability, mixtures containing 100% epoxy RAP and diluted epoxy RAP materials have significantly higher permeability values compared with the natural mix value. However, adding 5% silica fume significantly reduced the permeability. Compressive test results indicated that substituting 100% of aggregates with epoxy RAP or diluted epoxy RAP materials would reduce compressive strength by 55% on average. Furthermore, adding silica fume to reclaimed mixes was found to have no apparent effect on compressive strength.

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Section: Compressive Strength Test Resultssupporting

confidence: 86%

The Effect of Incorporating 100% of Undiluted and Diluted Reclaimed Epoxy Asphalt Materials into Pervious Cement Mixes

Alamri

Elmagarhe

et al. 2023

Coatings

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“…To further elucidate the effect of industrial solid waste inclusion on the pore structure, the pore volume proportions, which mean the volume percentages of the pores within specified ranges, are listed in Table 6. In accordance with the study by Abraham and Ransinchung ( 39 ), the pores can be divided into small capillary pores (pores with a size of 2.5 nm to 10 nm), medium capillary pores (pores with a size of 10 nm to 50 nm), large capillary pores (pores with a size of 50 nm to 1000 nm), and entrained air pores (pores with a size of >10000 nm). It is clear that there is limited noticeable difference in the pore proportions between these test specimens.…”

Section: Resultssupporting

confidence: 78%

Mechanical Properties and Durability of Sustainable Concrete Containing Various Industrial Solid Wastes

Zhang

Tang

et al. 2021

Transportation Research Record: Journal of the Transportation R

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Benefits of replacing ordinary Portland cement with industrial solid wastes are promising for reducing cement production and solving environmental problems associated with industrial solid wastes. In this study, an experimental investigation was conducted to evaluate the performance of sustainable concrete containing different industrial solid wastes (e.g., waste glass, coal gangue, fly ash, and slag), with the attention on the mechanical strength, chloride transport property, and pore structure characteristics. Three water to binder ratios (i.e., 0.38, 0.48, and 0.65) and three replacement levels (i.e., 10%, 20%, and 30%) were considered in this work. The test results show that regardless of the content and type of industrial solid wastes, the inclusion of industrial solid wastes generally exerts a negative influence on the mechanical properties, especially under high water to binder ratios. However, acceptable mechanical strength can still be achieved in these sustainable concretes. In addition, the inclusion of industrial solid wastes could enhance the chloride diffusion resistance of concrete, and also the concrete with waste glass powder showed the best performance. Furthermore, the incorporation of industrial solid wastes has a refinement effect on the microstructure of the matrix, manifesting as decreased cumulative pore volume and compacted microstructural morphology.

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“…At all ages, the ratio was 43% ~ 46%. This outcome underlined the findings of (Sola & Ozyazgan, 2017;Brand & Roesler, 2017a;2017b;Abraham & Ransinchung, 2018;2019a;Shi et al, 2020), where natural aggregates were gradually substituted by RAA. The findings of (Qiang et al, 2011) suggested that the asphalt film had a negative effect on the cement hydration process within the time frame of 80 hours, however, the data presented in Table 1 demonstrates that this effect had stabilized after 7 days.…”

Section: Compression and Tensile Strengthsupporting

confidence: 84%

Pyrolysis of Reclaimed Asphalt Aggregates in Mortar

Setiadji¹,

Wibowo²,

Jonkers³

et al. 2022

IJTech

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Asphalt pavement consists of aggregates resulting in a waste material at end of its life. The aggregates can be reused as basic material for asphalt or cementitious binding agents. In both scenarios, the recycled aggregates should provide a good bond with the binder to achieve strength. This study focuses on reusing recycled asphalt aggregates (RAA) in mortar. The major weakness of RAA is the thin oily film originating from the asphalt residue, weakening the bond with cement. The pyrolysis method is accessed in an attempt to overcome this weakness. Three scenarios were investigated; the use of virgin aggregates (VA), RAA, and pyrolysis recycled asphalt aggregate (PRAA) as constituent in mortar. All variables were set a constant except for the aggregate type, the VA mortar function as controlling element. This research is methodologically based on experimental data conducted in the laboratory, while aggregate samples were taken from the field. To analyze the influence of pyrolysis to the aggregate-to-cement bond behaviour, qualitative and quantitative data were collected. The quantitative data were the mechanical properties, the mortar tensile, and compression strength. The qualitative data were obtained from scanning electron microscope readings to visually observe the aggregate surface roughness and voids, including the aggregates cross-section and pre-existing micro-cracks in the aggregate-to-cement interface. Supporting data were the aggregates' abrasion rate and absorption. The RAA resulted in a significant mortar strength decrease. This conclusion was supported by the findings of pre-existing cracks in the interfacial transition zone. The pyrolysis method improved the compression strength but negligibly affected the tensile behavior. The compression and tensile strength increased as a function of time for both RAA and PRAA, and a strength convergence was reached at 28 days. The PRAA is considered an option for reuse in mortar, supporting nature conservation.

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Effects of Reclaimed Asphalt Pavement aggregates and mineral admixtures on pore structure, mechanical and durability properties of cement mortar

Cited by 28 publications

References 38 publications

The Effect of Incorporating 100% of Undiluted and Diluted Reclaimed Epoxy Asphalt Materials into Pervious Cement Mixes

The Effect of Incorporating 100% of Undiluted and Diluted Reclaimed Epoxy Asphalt Materials into Pervious Cement Mixes

Mechanical Properties and Durability of Sustainable Concrete Containing Various Industrial Solid Wastes

Pyrolysis of Reclaimed Asphalt Aggregates in Mortar

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