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Saturday, 20 July 2019
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Raw materials & technologies, Technologies

Developments in the application of chemical approaches to rubberised asphalt

Friday, 25 November 2016

Although rubberised asphalt has more than a 50-year history, it has not been widely adopted due to difficulties with its processability, unstable properties and high initial cost.

Rubberised asphalt consists of regular asphalt concrete mixed with crumb rubber made from recycled tires. Source: Thorsten Jutzie/pixelio.de

Rubberised asphalt consists of regular asphalt concrete mixed with crumb rubber made from recycled tires. Source: Thorsten Jutzie/pixelio.de

Chemical approaches, including chemical characterisation and the addition of chemical additives to rubberised asphalt, are useful tools to promote the applications of this technology. Chemical characterisation techniques such as infrared spectroscopy, thermogravimetric analysis, gel permeation chromatography, and sol-gel analysis are used to analyse the chemical composition of rubberised asphalt.

Rubberised asphalt with stable properties

The development of chemical characterisation for rubberised asphalt is described in terms of chemical degradation and stabilisation of rubber in asphalt. The evolution of the chemical composition has been evaluated and correlated for dry and wet processing, and indoor and outdoor aging. Following this, high performance rubberised asphalt realised by modification with different chemical additives is also discussed. The additives are categorised into polymers, inorganic filler, plasticiser and others. Finally, methods that combine several types of different additives that can be used to produce rubberised asphalt with stable properties and in an environmentally friendly manner are described.

The study is published in: Construction and Building Materials, Volume 131, 30 January 2017, Pages 101–113

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