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

Materials ◽  
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.

scholarly journals Environmental Impact Assessment of Different Warm Mix Asphalts

2021 ◽  
Vol 13 (21) ◽  
pp. 11869
Author(s):  
Anda Ligia Belc ◽  
Adrian Ciutina ◽  
Raluca Buzatu ◽  
Florin Belc ◽  
Ciprian Costescu
Keyword(s):  
Environmental Impact ◽  
Hot Mix Asphalt ◽  
Raw Materials ◽  
Asphalt Mixture ◽  
Warm Mix Asphalt ◽  
Organic Additive ◽  
Asphalt Mixtures ◽  
Organic Additives ◽  
Chemical Additive ◽  
Production Phase

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.

Long term performance of warm mix asphalt versus hot mix asphalt

2013 ◽  
Vol 20 (1) ◽  
pp. 256-266 ◽  
Author(s):  
Ziari Hasan ◽  
Behbahani Hamid ◽  
Izadi Amir ◽  
Nasr Danial
Keyword(s):  
Hot Mix Asphalt ◽  
Warm Mix Asphalt ◽  
Long Term Performance ◽  
Term Performance

Selection of External Coatings for Northern Pipelines: Laboratory Methodologies for Evaluation and Qualification of Coatings

2004 ◽  
Author(s):  
Sankara Papavinasam ◽  
R. Winston Revie ◽  
Michael Attard
Keyword(s):  
Standardized Tests ◽  
Protective Coatings ◽  
Climatic Conditions ◽  
Operational Conditions ◽  
The North ◽  
Long Term Performance ◽  
Term Performance ◽  
Near Future ◽  
Selection Of

In the near future, the construction of northern pipelines for transmission of natural gas will begin in North America. Construction in the harsh northern climate, with temperatures as low as −45°C, and remote location will impose unique challenges with respect to protective coatings. It is critical that the design of coatings be adequate to protect the pipelines under long-term, severe environmental conditions, including the extreme climatic conditions that will apply in the North before the pipe is installed and operation begins. There are many quality coatings from which to choose for application on new pipelines. The main issue is in understanding how to select and use coatings on pipelines in new regimes (e.g. Northern pipelines), which may operate in a different environment than do existing pipelines. Uniform, standardized tests that would simulate the conditions during construction and operation of Northern pipelines will allow external pipeline coatings to be selected with confidence regarding anticipated long-term performance under operational conditions. Selection of mainline coatings is important, but there is also a need to focus on field-applied coatings for both repairs and joints. Methodologies and standards that are available to evaluate coatings are reviewed in this paper.

scholarly journals Long-term performance and life cycle assessment of energy piles in three different climatic conditions

2020 ◽  
Vol 146 ◽  
pp. 1177-1191 ◽  
Author(s):  
Melis Sutman ◽  
Gianluca Speranza ◽  
Alessio Ferrari ◽  
Pyrène Larrey-Lassalle ◽  
Lyesse Laloui
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Climatic Conditions ◽  
Energy Piles ◽  
Long Term Performance ◽  
Term Performance
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