Researchers of Pyongyang University of Architecture have recently developed a new kind of asphalt emulsion for road restoration which can save much more materials and energy than ever before.
It is important to well repair and maintain roads because asphalt roads are broken or damaged due to different factors in the course of using them for a long time.
To this end, the restoration of asphalt roads is done by taking out damaged parts of roads and applying heat to them so as to pave again. But the smoke coming from asphalt heating pollutes the environment and gives much negative influence on human body.
It is a cationic asphalt emulsion to overcome such shortcomings. Asphalt emulsion is a thick liquid mixture emulsified by using emulsion, and is divided into two, cationic and anionic asphalt emulsions, according to physical properties.
Paek Nam Hyok, PhD, associate professor and director of the green environment technology exchange centre of the university, and his research group developed the cationic asphalt emulsion by relying on domestic materials.
The previous mixture for repair, which was used in the past to pave roads, was required to ensure over five centimetres of thickness of pavement surface since it was charged with negative electricity. The damage and abrasion of road can be overcome even when 1 cm of thickness is ensured, as the use of the new asphalt emulsion enables the mixture to take the electropositive charge while improving the combining power with the pavement surface.
When road repair is made with the help of hot asphalt mixture, it requires 170-180℃ of high heat and no small quantity of fuel.
“According to information available, much fuel (a ton of coal or two cubic metres of wood) is used to heat five tons of mixture. In case of repairing pavement road by using cationic asphalt emulsion, it can be done properly if 5℃ of temperature is ensured, while saving a large quantity of fuel,” said Paek.
This cationic asphalt emulsion mixture, which won the certificate of products of advanced techniques last year, can be used effectively for wearing course and waterproof blocking layer of foundation course.
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