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.
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22.09.2016 | National Institute for Materials Science
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21.09.2016 | Eberhard Karls Universität Tübingen
The Fraunhofer Institute for Organic Electronics, Electron Beam and Plasma Technology FEP has been developing various applications for OLED microdisplays based on organic semiconductors. By integrating the capabilities of an image sensor directly into the microdisplay, eye movements can be recorded by the smart glasses and utilized for guidance and control functions, as one example. The new design will be debuted at Augmented World Expo Europe (AWE) in Berlin at Booth B25, October 18th – 19th.
“Augmented-reality” and “wearables” have become terms we encounter almost daily. Both can make daily life a little simpler and provide valuable assistance for...
With the help of artificial intelligence, chemists from the University of Basel in Switzerland have computed the characteristics of about two million crystals made up of four chemical elements. The researchers were able to identify 90 previously unknown thermodynamically stable crystals that can be regarded as new materials. They report on their findings in the scientific journal Physical Review Letters.
Elpasolite is a glassy, transparent, shiny and soft mineral with a cubic crystal structure. First discovered in El Paso County (Colorado, USA), it can also be...
For the first time, Fraunhofer IKTS shows additively manufactured hardmetal tools at WorldPM 2016 in Hamburg. Mechanical, chemical as well as a high heat resistance and extreme hardness are required from tools that are used in mechanical and automotive engineering or in plastics and building materials industry. Researchers at the Fraunhofer Institute for Ceramic Technologies and Systems IKTS in Dresden managed the production of complex hardmetal tools via 3D printing in a quality that are in no way inferior to conventionally produced high-performance tools.
Fraunhofer IKTS counts decades of proven expertise in the development of hardmetals. To date, reliable cutting, drilling, pressing and stamping tools made of...
At AKL’16, the International Laser Technology Congress held in May this year, interest in the topic of process control was greater than expected. Appropriately, the event was also used to launch the Industry Working Group for Process Control in Laser Material Processing. The group provides a forum for representatives from industry and research to initiate pre-competitive projects and discuss issues such as standards, potential cost savings and feasibility.
In the age of industry 4.0, laser technology is firmly established within manufacturing. A wide variety of laser techniques – from USP ablation and additive...
Every three years, the plastics industry gathers at K, the international trade fair for plastics and rubber in Düsseldorf. The Fraunhofer Institute for Laser Technology ILT will also be attending again and presenting many innovative technologies, such as for joining plastics and metals using ultrashort pulse lasers. From October 19 to 26, you can find the Fraunhofer ILT at the joint Fraunhofer booth SC01 in Hall 7.
K is the world’s largest trade fair for the plastics and rubber industry. As in previous years, the organizers are expecting 3,000 exhibitors and more than...
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23.09.2016 | Life Sciences
23.09.2016 | Health and Medicine
23.09.2016 | Life Sciences