پرستو محسني لياسي

The most suitable material used for road paving is asphalt. Because it is cheaper than other materials, it is stable against changes in weather conditions, it has elasticity, it is available in abundance and everywhere, and it can be used in any weather with the necessary modifications. Until several decades ago, asphalt was used in its usual form (a mixture of bitumen and aggregate). But today, engineers are trying to improve the properties of asphalt due to the following reasons: Asphalt is facing problems such as cracking, rutting, lizard skin cracks due to fatigue, low temperature cracks, reduced useful life, etc. Is. In order to preserve the environment and reduce energy consumption, the use of semi-warm asphalt technology has increased significantly in recent years. There are different technologies for making semi-warm asphalt. In this research, Eutherm nano material as a new chemical additive and Sasobit as the most common organic wax are two examples of semi-warm asphalt manufacturing technologies that were eva‎luated and compared. Despite the many advantages of semi-heated asphalt, moisture sensitivity and rutting are two of the main concerns related to this technology that have been investigated in this research. In this research, glass and Kevlar fibers have been used with the aim of improving the performance and covering the weaknesses of semi-heated asphalt. The results of this research show that if these two types of fibers are used, it is possible to see an increase in the resistance against moisture sensitivity in semi-warm and warm samples. In the best case, adding 0.15% of Kevlar fibers to warm, semi-warm samples containing Sasobit and semi-warm containing Eutherm lead to an increase of 13, 15 and 10% in TSR, respectively. Also, in general, by adding fibers to the asphalt samples, the resistance to fatigue cracks increases in the middle temperature, and the highest increase is observed when using 0.3% of Kevlar fibers in all three types of asphalt, so that this amount is respectively in all three types. Hot, semi-hot asphalt containing Eutherm and semi-hot asphalt containing sasubite increases more than twice. On the other hand, the addition of fibers causes an increase in the mental value, so that this parameter is about 200 for the control sample, and in case of using 0.15% of Kevlar fibers, it has reached 490 with an increase of about 1.45 times. In semi-heated samples containing Eutherm and Sasobit, with the addition of 0.15% of Kevlar fibers, the mental number has increased by about 19% and 40%, respectively, and has improved the resistance of the samples against rutting.

آسفالت نيمه گرم , اووترم , ساسوبيت

warm mix asphalt , evotherm , sasobit

parastoo mohseni liasi

dr mahmoud ameri