Laboratory Evaluation of Warm-Mix Open Graded Friction Course Mixtures with Sasobit

2013 ◽  
Vol 779-780 ◽  
pp. 311-314
Author(s):  
Qi Yang Zhu ◽  
Guang Wei Hu ◽  
Ye Mao Zhang ◽  
Yuan Zhuang
Keyword(s):  
Field Trial ◽  
Warm Mix Asphalt ◽  
Laboratory Evaluation ◽  
Moisture Susceptibility ◽  
Rutting Resistance ◽  
Open Graded Friction Course ◽  
Road Project ◽  
Pavement Construction

This paper is to evaluate the feasibility of using warm mix asphalt (WMA) technology to produce quality open graded friction course (OGFC) mixtures. In the summer of 2012, a field trial project using Sasobit-OGFC was established in the Huanhu East Road project, Changzhou city. In line with the trail field project, the performances of raveling, draindown, rutting resistance and moisture susceptibility are conducted between Sasobit-OGFC mixtures and traditional HMA-OGFC mixtures. The results indicate that the mixing temperature of Sasobit-OGFC mixtures can be reduced by 20°Cwhen compared with that of HMA-OGFC mixtures. The performances of Sasobit-WMA mixtures are no worse than these of HMA-OGFC mixtures. A wider range of paving temperature is found when adding Sasobit into OGFC mixtures, which effectively enhances the quality of pavement construction.

Laboratory Investigation of Pavement Performance of Warm Mix Asphalt with Different Addition Methods

2013 ◽  
Vol 734-737 ◽  
pp. 2292-2297
Author(s):  
Qi Yang Zhu ◽  
Ye Mao Zhang ◽  
Guang Wei Hu ◽  
Yuan Zhuang
Keyword(s):  
Warm Mix Asphalt ◽  
Slight Reduction ◽  
Water Stability ◽  
Moisture Susceptibility ◽  
Rutting Resistance ◽  
Dry Process ◽  
Significant Difference ◽  
Low Temperature Cracking ◽  
Road Project ◽  
Pavement Construction

Warm Mix Asphalt (WMA) technology is increasingly popular in pavement construction. In the summer of 2012, a field trial project using Sasobit-WMA was established in the Huanhu East Road project, Changzhou city. In line with this trail field project, two addition ways of Sasobit were discussed to evaluate pavement performances in terms of workability, rutting resistance, low-temperature cracking and moisture susceptibility. Results identifies that the Sasobit-WMA has benefits of the workability, rutting resistance over the HMA. Although reduced anti-cracking and water stability performances occurred for the WMA, there is no significant difference between them. For Sasobit addition ways, the dry process has an easier workability and a better anti-rutting performance than those of the wet processes. Compared with the wet processes, the dry process has a slight reduction on anti-cracking and water stability performances. However, these reduction are under the control of specifications and also suitable for pavement construction.

Experimental Evaluation of Moisture Damage and Rutting Resistance for SBS Modified Warm Mix Asphalt Incorporating Recycled Asphalt Concrete

2021 ◽  
Vol 904 ◽  
pp. 464-469
Author(s):  
Mohammed Qadir Ismael
Keyword(s):  
Tensile Strength ◽  
Asphalt Concrete ◽  
Experimental Evaluation ◽  
Asphalt Binder ◽  
Stability Index ◽  
Warm Mix Asphalt ◽  
Recycled Asphalt ◽  
Moisture Susceptibility ◽  
Rutting Resistance ◽  
Styrene Butadiene

The efforts embedded in this paper have been devoted to designing, preparing, and testing warm mix asphalt (WMA) mixtures and comparing their behavior against traditional hot mix asphalt mixtures. For WMA preparation, the Sasobit wax additive has been added to a 40/50 asphalt binder with a concentration of 3%. An experimental evaluation has been performed by conducting the Marshall together with volumetric properties, indirect tensile strength, and wheel tracking tests to acquire the tensile strength ratio (TSR), retained stability index (RSI), and rut depth. It was found that the gained benefit of reduction in mixing and compaction temperatures was reversely associated with a noticeable decline in Marshall properties and moisture susceptibility indices designated by TSR, and RSI, and even the rut resistance was adversely affected. Modification of WMA mixtures by 3% of Styrene-Butadiene-Styrene (SBS) polymer coupled with replacement of virgin ingredient by 50% of recycled asphalt concrete granted a 20% and 15% growth in Marshall stability and tensile strength, respectively. Moreover, both TSR and IRS indices have risen to 87% and 90%, respectively associated with a 39% increase in rutting resistance ability.

scholarly journals Evaluation of warm mix asphalt performance incorporating high RAP content

2016 ◽  
Vol 43 (4) ◽  
pp. 343-350 ◽  
Author(s):  
Xuan Dai Lu ◽  
Mofreh Saleh
Keyword(s):  
Asphalt Pavement ◽  
Warm Mix Asphalt ◽  
Asphalt Mixtures ◽  
Reclaimed Asphalt Pavement ◽  
Test Results ◽  
Moisture Susceptibility ◽  
Rutting Resistance ◽  
Reclaimed Asphalt ◽  
Asphalt Performance ◽  
Characterization Test

Using reclaimed asphalt pavement (RAP) increases the sustainability benefits and can enhance the performance of warm mix asphalt (WMA) compared to traditional hot mix asphalt (HMA). However, the RAP content is generally limited in WMA because adding high RAP content may reduce the performance of WMA. In this paper, the authors studied the possibility of incorporating high RAP content from 25 to 70% by mass of WMA by using Evotherm as an additive. Laboratory performance of WMA–RAP mixtures was characterized and compared to a control HMA in terms of moisture susceptibility, rutting resistance, and fatigue characterization. Test results showed that Evotherm greatly improved the moisture resistance of WMA–RAP mixtures compared to HMA. Increasing RAP content made WMA–RAP mixtures stiffer and enhanced the rutting resistance, but decreased the fatigue resistance of the mixtures. Therefore, the maximum RAP content needs to be determined to ensure balance between the fatigue and rutting characteristics of asphalt mixtures.

Effects of Asphalt Foaming on Damage Characteristics of Foamed Warm Mix Asphalt

2021 ◽  
pp. 036119812199782
Author(s):  
Biswajit K. Bairgi ◽  
Md Amanul Hasan ◽  
Rafiqul A. Tarefder
Keyword(s):  
Permanent Deformation ◽  
Warm Mix Asphalt ◽  
Creep Recovery ◽  
Deformation Model ◽  
Contact Method ◽  
Moisture Susceptibility ◽  
Viscoelastic Continuum Damage ◽  
Foamed Asphalt ◽  
Flexural Beam ◽  
Wheel Tracking

In the asphalt foaming process, the foaming water content (FWC) controls the formation and characteristics of water bubbles. These water bubbles are expected to be expelled from the foamed warm mix asphalt (WMA) during mixing and compaction. However, foaming water may not be completely expelled, rather some of the microbubbles may be trapped in the foamed WMA even after compaction. These microbubbles, or undissipated water, can diffuse over time and cause damage to the foamed WMA. To this end, this study has determined the effects of foaming on the fatigue, moisture damage, and permanent deformation characteristics of foamed WMA. Foamed asphalt and mixtures were designed with varying FWCs and they were tested using linear amplitude sweep, multiple stress creep recovery, four-point flexural beam, and Hamburg wheel tracking tests. Primarily, asphalt foaming dynamics were assessed with a laser-based non-contact method. A simplified viscoelastic continuum damage concept and a three-phase permanent deformation model were used for damage evaluation. The study reveals that foaming softens the binder, which results in slightly higher rutting and moisture susceptibility, though an equivalent or slightly improved fatigue characteristic compared with the regular hot mix asphalt.

Evaluation of Moisture Susceptibility Minimization Strategies for Warm-Mix Asphalt: Case Study

2016 ◽  
Vol 28 (2) ◽  
pp. 05015002 ◽  
Author(s):  
Lorena Garcia Cucalon ◽  
Fan Yin ◽  
Amy Epps Martin ◽  
Edith Arambula ◽  
Cindy Estakhri ◽  
...  
Keyword(s):  
Warm Mix Asphalt ◽  
Moisture Susceptibility
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