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 A new tool for discovering nanoporous materials
23.05.2017 | Ecole Polytechnique Fédérale de Lausanne

nachricht Did you know that packaging is becoming intelligent through flash systems?
23.05.2017 | Heraeus Noblelight GmbH

All articles from Materials Sciences >>>

The most recent press releases about innovation >>>

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

Im Focus: Can the immune system be boosted against Staphylococcus aureus by delivery of messenger RNA?

Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.

Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....

Im Focus: A quantum walk of photons

Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.

The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....

Im Focus: Turmoil in sluggish electrons’ existence

An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.

We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...

Im Focus: Wafer-thin Magnetic Materials Developed for Future Quantum Technologies

Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.

Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...

Im Focus: World's thinnest hologram paves path to new 3-D world

Nano-hologram paves way for integration of 3-D holography into everyday electronics

An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...

All Focus news of the innovation-report >>>

Anzeige

Anzeige

Event News

Marine Conservation: IASS Contributes to UN Ocean Conference in New York on 5-9 June

24.05.2017 | Event News

AWK Aachen Machine Tool Colloquium 2017: Internet of Production for Agile Enterprises

23.05.2017 | Event News

Dortmund MST Conference presents Individualized Healthcare Solutions with micro and nanotechnology

22.05.2017 | Event News

 
Latest News

How herpesviruses win the footrace against the immune system

26.05.2017 | Life Sciences

Water forms 'spine of hydration' around DNA, group finds

26.05.2017 | Life Sciences

First Juno science results supported by University of Leicester's Jupiter 'forecast'

26.05.2017 | Physics and Astronomy

VideoLinks
B2B-VideoLinks
More VideoLinks >>>