Abstract
The main objective of this work is to evaluate the properties of hot asphalt mixtures that have been manufactured with different recycled concrete aggregate (RCA) percentages (0%, 20%, 40%, 60% and 80% of the fraction 5–13 mm) and asphalt (4%, 4.5% and 5%). Dense asphalt mixtures were made; partially replacing the natural aggregate (NA) fraction between 5 and 13 mm. Marshall specimens were manufactured to determine the main properties of the asphalt concrete (AC) in terms of density, voids, stability and deformation. Additionally, the optimal asphalt content (OAC) was determined, and measured the water sensibility, the stiffness modulus and the permanent deformation. The results corroborate the potential for using these sources of construction and demolition waste (CDW) as a RCA in asphalt concrete and show that the hot asphalt mixtures with up to 40% substitution of natural aggregate by recycled aggregate in the fraction 5–13 mm present good behavior.
Highlights
Due to the constant evolution in construction, tons of solid waste are generated resulting from new construction, remodeling, or the demolition of structures [1,2]
The analysis of variance (ANOVA) analysis carried out showed that the percentage of recycled aggregate has a significant influence on the density of the mixtures (p-value = 0.0023) while the percentage of asphalt does not have a significant influence on the density of the mixtures (p-value = 0.156)
Hot asphalt concrete mixtures manufactured with recycled aggregate from demolition waste were evaluated
Summary
Due to the constant evolution in construction, tons of solid waste are generated resulting from new construction, remodeling, or the demolition of structures [1,2]. The global impacts of solid waste are growing fast. The indiscriminate use of non-renewable natural resources generates waste without adequate final disposal causing enormous impacts on health, environment and economy. The quantities of waste materials are growing. The lack of natural resources and the shortage of landfill spaces [4] represent the importance of finding innovative ways of reusing and recycling waste materials [5]. Conserve natural resources, reduce costs and make rational use of energy, several countries are managing the recycling and reuse of construction and demolition waste (CDW) [6,7]
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