چكيده به لاتين
Considering the essential role of the road network in creating connections between different regions and the economic and social development of every country, the issue of their maintenance and repair becomes one of the most important and vital issues of road organizations. Microsurfacing as a protective asphalt, as an environmentally friendly method, is considered as one of the most important preventive maintenance methods. The use of microsurfacing delays the occurrence of pavement damage; reduces energy consumption and maintenance costs in the long term. In recent years, increasing environmental awareness and attention to sustainable development has prioritized the use of recycled materials in order to save the consumption of non-renewable resources. Therefore, this research has been carried out with the aim of evaluating the feasibility of using waste marble powder filler in the microsurfacing mixing plan and evaluating its performance and reducing its surface temperature. In this regard, after examining the physical and chemical characteristics of stone materials and fillers, marble powder at five different levels of zero, 25, 50, 75 and 100% was replaced with the existing filler in the granulation of stone materials (passed through sieve number 200). Also each of them were evaluated at three different levels of 6, 6.5 and 7 percent of emulsion according to ISSA A143 standard. This evaluation was done by Wet Cohesion Test, Loaded Wheel Test and Wet Track Abrasion Test. In general, the results of the tests showed that the mixtures containing waste marble powder filler not only meet the requirements of the regulation, but also clearly showed that the use of marble powder is compatible due to its favorable physical and chemical characteristics, It has good compatibility with emulsion and improves the performance of microsurfacing.
So that the results of Wet Cohesion Test in 30 and 60 minutes, Wet Track Abrasion Test, vertical and lateral displacement of samples under loading for sample containing 100%marble filler for 7%bitumen, respectively, 27.7%, 31.8%, 47.98%, 33.33% and 34.58% improved recovery compared to the control sample. Also in evaluating the thermal performance of microficing mixtures containing marble powder in different colors, although red marble powder does not make much temperature difference compared to the control sample; But other samples, between 1.15% to 6.48 %, have seen for the Green and White samples, respectively, Which are , respectively equivalent to 0.8 and 4.5 degrees reduction in the mean of maximum temperature of the sample compared to the control sample.This result confirms the effect of the mastic effect on the amount of energy absorption, energy disposal and reducing the temperature of the mixture compared to the control sample.
