Effect of temperature reduction, foaming water content, and aggregate moisture content on performance of foamed warm mix asphalt

Ali, Anum; Abbas, Ala; Nazzal, Munir D.; Alhasan, Ahmad; Roy, Arjun; Powers, David B.

doi:10.1016/j.conbuildmat.2013.07.081

Cited by 65 publications

(15 citation statements)

References 5 publications

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“…Moreover, this reduction in emission is also beneficial to workers who might suffer the negative effects of the emission due to long-term exposure to the fumes during asphalt paving process; the condition is even worse for paving projects done in a closed area such as during construction of tunnels [13]. Additionally, electric consumption in the mixing of the materials and in moving the materials throughout the plant is reduced due to the lower manufacturing temperature of WMA mixture [14,15].…”

Section: Introductionmentioning

confidence: 95%

Laboratory evaluation on the characteristics and pollutant emissions of nanoclay and chemical warm mix asphalt modified binders

Abdullah

Hainin

Yusoff

et al. 2016

Construction and Building Materials

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Section: Introductionmentioning

confidence: 95%

Laboratory evaluation on the characteristics and pollutant emissions of nanoclay and chemical warm mix asphalt modified binders

Abdullah

Hainin

Yusoff

et al. 2016

Construction and Building Materials

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“…It is believed that the stiff and aged binder from RAP would counteract with the softer WMA mix to balance the rutting resistance of WMA [18]. Another concern for WMA is the partially dried aggregates which can result from lower mixing and compaction temperatures [9,17,20]. Also, injection of water during the foaming process can result in higher susceptibility to moisture-induced damage for foamed WMA mixes [21].…”

Section: Introductionmentioning

confidence: 99%

Rutting and moisture-induced damage potential of foamed warm mix asphalt (WMA) containing RAP

Rahman

Ghabchi

Zaman

et al. 2021

Innov. Infrastruct. Solut.

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Despite significant economic and environmental benefits, performance of warm mix asphalt (WMA) containing reclaimed asphalt pavement (RAP) remains a matter of concern. Among the current WMA technologies, the plant foaming technique (called “foamed WMA” in this study) has gained the most attention, since it eliminates the need for chemical additives. In the present study, the laboratory performance, namely rutting and moisture-induced damage potential of foamed WMA containing RAP were evaluated and compared with those of similar hot mix asphalt (HMA) containing identical amount of RAP. Dynamic modulus, Hamburg wheel tracking (HWT) and flow number tests were performed to assess the rutting resistance of the mixes. Also, stripping inflection point from HWT tests and tensile strength ratio after AASHTO T 283 and moisture induced sensitivity test (MIST) conditioning were used to evaluate the moisture-induced damage of asphalt mixes. It was found that MIST conditioning effectively simulates the moisture-induced damage and can capture the propensity of asphalt mixes to moisture damage more distinctly compared to AASHTO T 283 method due to application of cyclic loadings. The foamed WMA was found to exhibit higher rutting and moisture-induced damage potential due to lower mixing and compaction temperatures compared to HMA. However, the increase in RAP content was found to reduce rutting and moisture-induced damage potential for WMA. Therefore, the lower stiffness of foamed WMA may be compensated with the addition of stiffer binder from RAP.

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“…This implies that foamed WMA mixtures are more vulnerable to moisture damage than traditional HMA mixtures. However, the test results from the research by Ali et al indicated that increasing the foaming water content (FWC) up to 2.6% did not seem to detrimentally affect the moisture damage and rutting resistance of foamed WMA mixtures [ 15 ].…”

Section: Introductionmentioning

confidence: 99%

Investigation of Moisture Dissipation of Water-Foamed Asphalt and Its Influence on the Viscosity

Tang

et al. 2020

Materials

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Water-foamed asphalt is capable of improving the workability of asphalt mixture. It has been extensively used for its energy-saving and emission-reducing features. Water plays an essential part in improving the workability of water-foamed asphalt mixture. However, there is still lack in profound studies of moisture dissipation of the water-foamed asphalt over time and its influence on workability. In this study, the evolutions of residual water content and rotational viscosity of the water-foamed asphalt with time were respectively measured by the analytical balance and modified rotational viscometer (RV). The atomic force microscopy (AFM) analysis was conducted to discuss the mechanism of viscosity reduction of water-foamed asphalt. The results showed that moisture evaporation is significantly influenced by the foaming water content and ambient temperature, which results in the different stabilizing time of water-foamed asphalt. When water-foamed asphalt was stabilized, the residual water inside the asphalt was less than 0.01% relative to the asphalt mass. The AFM analysis showed that the foaming process changed the distribution of wax in the water-foamed asphalt resulting in reduction of viscosity. The viscosity reduction of asphalt is highly related to the initial foaming water content. After the foaming process, the viscosity keeps stable and is independent of moisture dissipation.

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Effect of temperature reduction, foaming water content, and aggregate moisture content on performance of foamed warm mix asphalt

Cited by 65 publications

References 5 publications

Laboratory evaluation on the characteristics and pollutant emissions of nanoclay and chemical warm mix asphalt modified binders

Laboratory evaluation on the characteristics and pollutant emissions of nanoclay and chemical warm mix asphalt modified binders

Rutting and moisture-induced damage potential of foamed warm mix asphalt (WMA) containing RAP

Investigation of Moisture Dissipation of Water-Foamed Asphalt and Its Influence on the Viscosity

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