Functional, structural and road safety performance of a road pavement built with recycled slate waste over three years
DOI:
https://doi.org/10.6008/CBPC2179-6858.2021.004.0029Keywords:
Slate residues, Environmental sustainability, Pavement mechanics, MeDiNaAbstract
The following article aims to present the functional, structural and road safety performance of an experimental 263m long stretch of road, built in the Vargem Grande District, municipality of Papagaios, MG. The pavement was built with crushed slate aggregates, an alternative material, environmentally inert, used in the reinforcement layers of the subgrade, sub-base, base and covering, and with special attention to the last one, in asphalt concrete (AC), as it is the most noble. The performance of the track of the experimental section was based on methodological basis of functional, structural, mechanical and safety against skidding assessments. The functional evaluation was performed by determining the Global Severity Index (IGG). For structural, non-destructive evaluation, the FWD equipment was used to estimate the resilient module of each pavement layers. And for structural, destructive evaluation, the rotary probe equipment was used, which allowed the removal of specimens from the coating layer, and from which the structure of the mineral skeleton of the asphalt mixtures researched and applied in the field was observed. Road safety was verified through field tests that evaluate the micro and macro texture of the asphalt coating. Regarding crushed slate aggregates, the results of the characterization tests were promising, as they did not suffer breakage, crushing or cracking due to traffic, although they have a lamellar nature; they also showed good adhesion for use in hot asphalt mix (asphalt concrete). The condition of the track as a whole, due to the low number of defects found, had an evaluation corresponding to the “excellentâ€, according to the IGG (General Severity Index), with no impairment of the track for the user regarding skidding. In view of the results obtained, the use of recycled slate residues used in this research has presented satisfactory results and it is expected that its use will be increasingly encouraged in paving works, due to its high consumption of aggregates (waste), it contributes to environmental sustainability and foster employment and income for the rock extraction region.
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