Novel Testing Procedure for Assessment of Quality of Foamed Warm Mix Asphalt Binders

Öztürk, Hande İşık; Kutay, M. Emin

doi:10.1061/(asce)mt.1943-5533.0000924

Cited by 20 publications

(11 citation statements)

References 6 publications

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“…A higher expansion ratio promises larger surface area to coat the aggregates and a longer half-life will provide lower viscosity for a longer period ensuring enough workability of the mixture (Ozturk and Kutay 2013).…”

Section: Foaming Technologiesmentioning

confidence: 99%

Warm Mix Asphalt

Zaumanis

2014

Climate Change, Energy, Sustainability and Pavements

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Section: Foaming Technologiesmentioning

confidence: 99%

Warm Mix Asphalt

Zaumanis

2014

Climate Change, Energy, Sustainability and Pavements

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“…More than 94% of the 2.7 million miles of paved roads in the United States are surfaced with asphalt [4,5]. In terms of existing asphalt pavement construction technology, hot mix asphalt (HMA) is a main technology [6][7][8]. During the production of hot mix asphalt, a large amount of fuel was consumed, and the massive toxic gases and dust was released [9,10].…”

Section: Introductionmentioning

confidence: 99%

Laboratory Investigation on Physical, Rheological Thermal and Microscopic Characteristics of Water-Foamed Asphalt under Three Environmental Conditions

Guo

Li³

et al. 2020

Coatings

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Applications of water-foamed binders have received widespread attention due to its environmental and economic benefits. This study aims to evaluate the properties of water-foamed asphalt under three environmental conditions (high-temperature evaporation, low-temperature frozen and the freeze–thaw cycle). Conventional physical properties tests, dynamic shear rheometer test (DSR), differential scanning calorimetry test (DSC) and scanning electron microscope test (SEM) are employed to assess the physical, rheological thermal and microscopic characteristics of samples. Conventional physical properties test results showed that the performance of a foamed binder had declined under three environmental processes and the foamed asphalt gradually returned to the characteristics before being foamed, with the increase of process time. A comprehensive evaluation index, deterioration degree was proposed based on the test results and entropy theory, and the deterioration process of the foamed binder under three environmental conditions was quantified. Moreover, freeze–thaw (F–T) cycles had been proved to have the most significant influence on the performance of a foamed binder among three environmental factors, which was a key issue that limits the application and promotion of foamed asphalt in seasonal frozen regions. The DSR test showed that the resistance to high-temperature permanent deformation of the foamed binder was improved after F–T cycles, and the fatigue resistance became worse. The sensitivity analysis of complex modulus and frequency illustrated that foamed asphalt after F–T cycles were more sensitive to the loading frequency and less sensitive to the temperature. The DSC test indicated that the thermal stability of foamed asphalt was improved after F–T cycles. The disappearance of circular “cavitation” observed through SEM test revealed that moisture of foamed asphalt was gradually precipitated and self-healing phenomenon occurred during F–T cycles.

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“…The WMA technology produces bituminous mixtures at temperatures of about 120 °C. A technology that allows lowering the mix production temperature even further to around 100 °C is labelled half warm mix asphalt (HWA) and makes use of bitumen foamed with water [26,27,28]. The foaming process involves injecting cold water into hot bitumen at high pressure in an expansion chamber [19,29].…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Active Agent (SAA) on 50/70 Bitumen Foaming Characteristics

2019

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To ensure the standard properties of half-warm asphalt (HWA) mixes produced with foamed bitumen, the binder needs to have the best possible characteristics. One way to attain this is to modify the bitumen before it is foamed. The 50/70 penetration bitumen used in this study, was modified with a surface active agent (SAA) at different rates (0.2%, 0.4%, and 0.6% by wt.). The effect of the modifier on the bitumen properties (penetration, softening point, the Fraass breaking point, dynamic viscosity at 60 °C, 90 °C, and 135 °C) and on the binder foaming parameters (expansion ratio - ER, half-life - HL, foam index - FI) was investigated and the optimum quantity of foaming water was determined. Statistical analysis of the results showed that the addition of 0.6% SAA had the most beneficial effect on the set of 50/70 bitumen standard properties and foaming characteristics.

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Novel Testing Procedure for Assessment of Quality of Foamed Warm Mix Asphalt Binders

Cited by 20 publications

References 6 publications

Warm Mix Asphalt

Warm Mix Asphalt

Laboratory Investigation on Physical, Rheological Thermal and Microscopic Characteristics of Water-Foamed Asphalt under Three Environmental Conditions

Effect of Surface Active Agent (SAA) on 50/70 Bitumen Foaming Characteristics

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