Long term performance of warm mix asphalt versus hot mix asphalt

Generally, the warm mix asphalt (WMA) technology can reduce the mixing and paving temperature effectively as compared with that of hot mix asphalt (HMA), which is considered more environment-friendly. In this study, the environmental impacts and resource consumptions of WMA and HMA pavements were analyzed comparatively using the life cycle assessment (LCA) method. A LCA model of pavement was built; meanwhile, the relevant life cycle inventory (LCI) of WMA and HMA pavements was also collected and analyzed. The midpoint impact categories including Global Warming Potential (GWP), Chinese Abiotic Depletion Potential (CADP), and Particulate Matter Formation (PMF) were assessed for five cases. The assessment results showed that the resource consumptions of both WMA and HMA pavements in entire life were almost at the same level, while the environmental impacts of WMA pavement related to greenhouse gases and PM2.5 emissions were significantly less than that of HMA pavement, except for the case where the long-term performance of WMA pavement is much worse than that of HMA pavement. In final, it could be concluded that WMA pavement is more environment-friendly compared with HMA pavement although they have the same-level resource consumptions.

Download Full-text

Research of Rigid Pavement on Structure Combination of HMA Overlays

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.477-478.765 ◽

2013 ◽

Vol 477-478 ◽

pp. 765-769

Author(s):

Tao Liu ◽

Guang Wei Hu ◽

Ying Chun Gu

Keyword(s):

Sandwich Structure ◽

Hot Mix Asphalt ◽

Reflective Cracking ◽

Rigid Pavement ◽

Asphalt Overlays ◽

Long Term Performance ◽

Term Performance

To study the influence of structure combination on performance of rigid pavement hot-mix asphalt (HMA) overlays, four Hot-mix asphalt overlays are prepared for the research at the base of long-term performance of experimental roads. The results indicate that the SMA +AC+SMA sandwich structure can effectively restrain reflective cracking and rut. In addition, the structure can reduce the thickness and cost of pavement.

Download Full-text

Rheological Evaluation of Short- and Long-Term Performance for Warm Mix Asphalt (WMA) Binders

RILEM Bookseries - 8th RILEM International Symposium on Testing and Characterization of Sustainable and Innovative Bituminous Materials ◽

10.1007/978-94-017-7342-3_11 ◽

2015 ◽

pp. 129-139 ◽

Cited By ~ 4

Author(s):

Mohammed Sadeq ◽

Eyad Masad ◽

Hussain Al-Khalid ◽

Okan Sirin ◽

Dallas Little

Keyword(s):

Warm Mix Asphalt ◽

Short And Long Term ◽

Long Term Performance ◽

Term Performance

Download Full-text

Influence of Different Warm Mix Additives on Characteristics of Warm Mix Asphalt

Materials ◽

10.3390/ma14133534 ◽

2021 ◽

Vol 14 (13) ◽

pp. 3534

Author(s):

Anda Ligia Belc ◽

Erdem Coleri ◽

Florin Belc ◽

Ciprian Costescu

Keyword(s):

Asphalt Mixture ◽

Warm Mix Asphalt ◽

Organic Additive ◽

Climatic Conditions ◽

Organic Additives ◽

Chemical Additive ◽

Warm Mix Additives ◽

Long Term Performance ◽

Term Performance

The interest in minimising fuel consumption and greenhouse gas emissions among road specialists is increasing. Thus, methods for reducing asphalt concrete mixing and compaction temperatures by a few tens of degrees Celsius without compromising the long-term performance has become a topic of significant interest. This study is focused on the analysis of warm mix asphalt (WMA) prepared with locally available materials in order to determine the suitable technology applicable to the specific traffic and climatic conditions of Romania. WMA was prepared using different warm mix additives (organic additives, chemical additive, and synthetic zeolite) at different mixing and compaction temperatures, and bitumen blends with these additives were analysed by carrying out the dynamic shear rheometer test and evaluating the penetration index. In conclusion it was noted that most additives did not lead to a significant change of bitumen`s characteristics, but the organic additive had a big influence on the bitumen`s properties. The characteristics of WMA are very similar to those of HMA. The mixing and compaction temperatures could be reduced by approximately 40 °C when WMA was blended with the additives without compromising the performance of the asphalt mixture, compared to hot mix asphalt.

Download Full-text

Influence of Selected Warm Mix Asphalt Additives on Cracking Susceptibility of Asphalt Mixtures

Materials ◽

10.3390/ma13010202 ◽

2020 ◽

Vol 13 (1) ◽

pp. 202 ◽

Cited By ~ 2

Author(s):

Marcin Stienss ◽

Cezary Szydlowski

Keyword(s):

Low Temperature ◽

Warm Mix Asphalt ◽

Asphalt Mixtures ◽

Asphalt Binders ◽

Test Results ◽

Specimen Test ◽

Low Temperature Cracking ◽

Long Term Performance ◽

Term Performance

Warm mix asphalt (WMA) has been widely accepted as a future asphalt paving technology. Besides clear advantages, there are still some concerns regarding durability and long-term performance of pavements made with this type of asphalt mixtures. One of the most important issues is low temperature behaviour of WMA because certain additives used for temperature reduction can affect bitumen properties. This paper presents the evaluation of low-temperature properties of laboratory-produced asphalt concrete for wearing course with selected WMA additives. One type of bitumen with paving grade 50/70 and five WMA additives of different nature (organic, surface tension reducer and combination of both) were used in this study. The production and compaction temperature of mixtures containing WMA additives was 25 °C lower in comparison with the temperature of the reference mix. To assess the susceptibility of WMA to low-temperature cracking, Semi-Circular Bending (SCB) and Thermal Stress Restrained Specimen Test (TSRST) were used. Supplementary rating was made by analysing Bending Beam Rheometer (BBR) test results of asphalt binders.

Download Full-text