Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Green Material For Road Pavement: Low Energy, Warm Mix Asphalt With High Recycled Material Content

10.06.2014

The use of Reclaimed Asphalt Pavement (RAP),a recycled material obtained from deteriorated roads is a suitable way to conserve non-renewable resources that is aggregates and bitumen used for asphalt mixes. This invention received a Gold award in the Invention Innovation and Design Exposition 2014.

The scarcity of resources especially in the energy sector (eg. oil sector) and the shortage of new supplies of natural materials have affected the road building industry. There is a need for a reduction in temperature in the production of hot mix asphalt (HMA) to conserve energy and the need to conserve scarce resources such as virgin aggregates to produce HMA.

With the dwindling supply of new resources and spiraling cost of materials, the use of Reclaimed Asphalt Pavement (RAP),a recycled material obtained from deteriorated roads is a suitable way to conserve non-renewable resources that is aggregates and bitumen used for asphalt mixes. Most road authorities allow the incorporation of not more than 30% of RAP in hot mix asphalt to avoid any detrimental effects on the mix properties.

The increase in asphalt materials prices encouraged the road construction industry to strive for the use of higher percentages of RAP to reduce the cost of road projects. A higher addition of RAP should enhance the value of the recycled pavements and have the potential for reducing the quantity of waste materials. However, the use of RAP in HMA still requires mixing and compaction temperatures similar to the conventional HMA.

Recent advances in technology has allowed the temperature for mixing and compaction of asphaltic concrete mixes to be lowered compared to the mixing and compaction temperatures for conventional hot mix asphalt. Warm Mix Asphalt (WMA) allows a reduction in the mixing and compaction temperatures by using additives such as sasobit, which is a paraffin wax derived from coal gasification process.

The chemical composition of sasobit can be described as fine crystalline materials in long -chain hydrocarbons, composed from 40 to 115 carbon atoms. The melting point of sasobit is about 100 degree celcius and it is completely dissolved in bitumen at temperature above 115 degree Celsius. Mixing temperature for WMA is reduces to a range of about 115 to 135 degree Celsius, which is substantially lower than the mixing temperature of 150 to 160 degree Celsius used for conventional hot mix asphalt.

Therefore, there are enormous benefits of incorporating high percentages of RAP in WMA mixes, namely the reduction of energy to produce HMA and conservation of non-renewable resources (aggregates and bitumen) used for asphalt mixes.

This research investigated and compared the performance of WMA containing 30%, 40% and 50% of RAP by weight of the mix with the conventional asphaltic concrete. The performance of the mixes was compared by measuring the stiffness value, moisture susceptibility and rutting depth.

It was found that the warm mix asphalt using sasobit-additive and containing high percentage of RAP could produce mix with similar performance to the conventional HMA mix and complied to all Public Work Department of Malaysia's specification requirement. This shows that WMA added with up to 50% RAP has the potential to save production costs in terms of lower energy requirements and also savings in terms of raw materials used (due to high amount of recycled material added in the mix), without compromising the performance of the mix as it adheres to all requirements and specifications.

This study/invention received a Gold award in the Invention Innovation and Design Exposition 2014 UiTM Shah Alam.

Darmarajah Nadarajah | Research SEA News
Further information:
http://inforec.uitm.edu.my
http://www.researchsea.com

Further reports about: Asphalt Energy Green Mix Pavement UiTM aggregates bitumen conventional degree hot mix asphalt materials mixing reduction temperature temperatures

More articles from Materials Sciences:

nachricht Metamaterials Shine Bright as New Terahertz Source
24.04.2015 | Department of Energy, Office of Science

nachricht Connecting Three Atomic Layers Puts Semiconducting Science on Its Edge
24.04.2015 | Department of Energy, Office of Science

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Fast and Accurate 3-D Imaging Technique to Track Optically-Trapped Particles

KAIST researchers published an article on the development of a novel technique to precisely track the 3-D positions of optically-trapped particles having complicated geometry in high speed in the April 2015 issue of Optica.

Daejeon, Republic of Korea, April 23, 2015--Optical tweezers have been used as an invaluable tool for exerting micro-scale force on microscopic particles and...

Im Focus: NOAA, Tulane identify second possible specimen of 'pocket shark' ever found

Pocket sharks are among the world's rarest finds

A very small and rare species of shark is swimming its way through scientific literature. But don't worry, the chances of this inches-long vertebrate biting...

Im Focus: Drexel materials scientists putting a new spin on computing memory

Ever since computers have been small enough to be fixtures on desks and laps, their central processing has functioned something like an atomic Etch A Sketch, with electromagnetic fields pushing data bits into place to encode data.

Unfortunately, the same drawbacks and perils of the mechanical sketch board have been just as pervasive in computing: making a change often requires starting...

Im Focus: Exploding stars help to understand thunderclouds on Earth

How is lightning initiated in thunderclouds? This is difficult to answer - how do you measure electric fields inside large, dangerously charged clouds? It was discovered, more or less by coincidence, that cosmic rays provide suitable probes to measure electric fields within thunderclouds. This surprising finding is published in Physical Review Letters on April 24th. The measurements were performed with the LOFAR radio telescope located in the Netherlands.

How is lightning initiated in thunderclouds? This is difficult to answer - how do you measure electric fields inside large, dangerously charged clouds? It was...

Im Focus: On the trail of a trace gas

Max Planck researcher Buhalqem Mamtimin determines how much nitrogen oxide is released into the atmosphere from agriculturally used oases.

In order to make statements about current and future air pollution, scientists use models which simulate the Earth’s atmosphere. A lot of information such as...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

HHL Energy Conference on May 11/12, 2015: Students Discuss about Decentralized Energy

23.04.2015 | Event News

“Developing our cities, preserving our planet”: Nobel Laureates gather for the first time in Asia

23.04.2015 | Event News

HHL's Entrepreneurship Conference on FinTech

13.04.2015 | Event News

 
Latest News

Electrons Move Like Light in Three-Dimensional Solid

24.04.2015 | Materials Sciences

Connecting Three Atomic Layers Puts Semiconducting Science on Its Edge

24.04.2015 | Materials Sciences

Understanding the Body’s Response to Worms and Allergies

24.04.2015 | Health and Medicine

VideoLinks
B2B-VideoLinks
More VideoLinks >>>