Influence of warm mix additives on the low-temperature behavior of bitumen using the Bending Beam Rheometer (BBR)

Belc, Anda Ligia; Pop, Ion Octavian; Belc, Florin; Costescu, Ciprian; Tehrani, Fateh Fakhari

doi:10.1016/j.conbuildmat.2020.121682

Cited by 17 publications

(3 citation statements)

References 14 publications

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“…Figure 7 presents the stress relaxation ability of bitumen versus the aging method at −12 and −18 °C. The higher the m-value, the stronger the stress relaxation ability [ 36 ]. It could be found that the m-value of bitumen at −12 °C was higher than that at −18 °C, which indicates that bitumen tends to relax more stress at higher temperatures.…”

Section: Resultsmentioning

confidence: 99%

Comparative Study of Thermal-Oxidative Aging and Salt Solution Aging on Bitumen Performance

Zhang

Hoff

2021

Materials

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The aging of bitumen is detrimental to the durability and service life of asphalt pavement. Previous studies found that bitumen was suspected to be aged by not only thermal oxidation but also solution immersion. This research aims to compare the effect of thermal-oxidative aging and salt solution aging on bitumen performance. For this purpose, a thin film oven test (TFOT) and pressure aging vessel aging (PAV) were selected as thermal-oxidative aging, and 10% NaCl aging and 10% CaCl2 aging were selected as salt solution aging. The morphology, oxygen content, physical properties, low-temperature properties, and high-temperature properties of bitumen were analysed by employing scanning electron microscopy with an energy dispersive spectrometer (SEM-EDS), physical tests, a bending beam rheometer (BBR), and a dynamic shear rheometer (DSR). Test results show that both thermal-oxidative aging and salt solution aging had similar influencing trends in the oxygen content, physical, low-temperature, and high-temperature properties of bitumen but had different changes in morphology. The aging degrees caused by four kinds of aging methods were obtained based on the summed values of the absolute aging factor of all parameters: PAV > 10% NaCl > TFOT > 10% CaCl2. The conclusions could provide a theoretical basis to establish a standard for the solution aging of bitumen.

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Section: Resultsmentioning

confidence: 99%

Comparative Study of Thermal-Oxidative Aging and Salt Solution Aging on Bitumen Performance

Zhang

Hoff

2021

Materials

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“…The percentages of additives and synthetic zeolite were recommended by suppliers. The asphalt mixture dosage and the efficiency of additives used were confirmed by laboratory tests on binders and asphalt mixtures [36,37].…”

Section: Analysed Asphalt Mixture Casesmentioning

confidence: 91%

Environmental Impact Assessment of Different Warm Mix Asphalts

et al. 2021

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Within the last decade, much attention has been focused on determining viable techniques for producing sustainable asphalt mixtures and minimizing fuel use and greenhouse gas emissions. Thus, warm mix asphalt (WMA) has become a topic of significant interest among road specialists as it offers a potential solution for reducing the environmental impact of the asphalt mixtures due to the decreased temperatures they require for mixing and compaction compared to hot mix asphalt (HMA). The present study is focused on the Life Cycle Assessment (LCA), according to a “Cradle-to-Gate” approach, of hot mix asphalt and warm mix asphalt prepared with locally available materials and different warm mix additives such as organic additives, chemical additive, and synthetic zeolite. For the analysis of the environmental impact of the warm mix asphalts was used a dedicated software for modeling and evaluating the LCA. The WMA prepared with chemical additive or organic additive led to a decrease of the environmental impact, in the production phase, compared to HMA. The study reveals that the raw materials extraction has the greatest impact on the environment in all studied cases, followed by the actual production phase of the asphalt mixture. For WMA produced with additives there was a decrease in the global impact on the environment compared to HMA.

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“…The bituminous layers may crack if the binder is low-temperature sensitive. The flexural creep stiffness of the low-temperature mastic does not seem to be affected by the chemical make-up or shape of the filler, according to research of the effectiveness of bituminous mastic under freezing conditions [1]. We can draw the conclusion that, with a slower loading rate, the BBR strength test has been utilised to determine the rheological characteristics of asphalt binders.…”

Section: Introductionmentioning

confidence: 99%

To study the Effect of Organophilic Nano-clay on Creep Stiffness of Asphalt Binder at Low Temperatures

Waqas¹,

Hafeez²,

Saadat³

2022

IJRASET

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The asphalt binder must be modified to extend the service life of flexible pavements. As the temperature outside drops, the pavements shrink and develop internal stresses. The pavement may break if this contraction happens quickly enough because it won't have time to relax these stresses. Due to the cracking's orientation with respect to the flow of traffic, this form of fracture is frequently referred to as a "thermal crack" or a "transverse crack.". The purpose of this article is to assess how adding nanoclay to asphalt binder changes its performance at low temperatures. The stiffness and stress relaxation time of a material can be measured with a Bending Beam Rheometer (BBR). It is ideal for asphalt binders to be able to release built-up tensions and not become overly stiff at low temperatures. The BBR test was carried out to investigate the low-temperature behaviour of asphalt binder. Test samples were prepared by adding varying nanoclay content and test temperatures were defined. Three small beams of each percentage were prepared and tested after conditioning at defined test temperatures. Results of modified asphalt binder were assessed and contrasted to unmodified asphalt binder to optimize the nanoclay content. The study revealed that increment in nanoclay amount increased the creep stiffness of asphalt binder. İt was concluded from the study that improvement of creep stiffness played a key role towards the low-temperature performance. The maximum increase in creep stiffness was found by the addition of 5 % nanoclay at -16 °C

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Influence of warm mix additives on the low-temperature behavior of bitumen using the Bending Beam Rheometer (BBR)

Cited by 17 publications

References 14 publications

Comparative Study of Thermal-Oxidative Aging and Salt Solution Aging on Bitumen Performance

Comparative Study of Thermal-Oxidative Aging and Salt Solution Aging on Bitumen Performance

Environmental Impact Assessment of Different Warm Mix Asphalts

To study the Effect of Organophilic Nano-clay on Creep Stiffness of Asphalt Binder at Low Temperatures

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