Abstract
Today the use of Construction and Demolition Materials (CDM) can be considered as a suitable solution for the construction or the rehabilitation of road pavements. In this context, it is central to minimizing waste production, favoring the reuse through new production cycles to replace virgin natural raw materials. As illustrated in this study, steel slag has mechanical properties that justify its use as aggregate in the manufacture of bituminous mixes. In road construction, their use is focused on the substitution of fine aggregate and filler in bituminous mixtures. Mechanical characterizations, Marshall stability and indirect tensile resilient modulus (ITSM) tests were used to evaluate the laboratory performance of the mixtures. The research aims are to provide the use of these materials for the construction of the entire road pavement structure; in this study authors used these materials both in the characterization of cementitious layers and in those with bituminous conglomerate. In both cases, the use of steel slag has favored an increase of stiffness in the mixtures.
Highlights
The growing demand for raw materials has focused attention in the field of civil engineering toward the use of constructive modalities with alternative materials
The results showed that the addition of steel slag into asphalt mixtures had high resistance to permanent deformation and moisture-induced damage
The analysis of the flow and the value of CTI confirms what is seen in the previous paragraph about the increase in stiffness given by the slag to the mixture, with consequent reduction of deformability
Summary
The growing demand for raw materials has focused attention in the field of civil engineering toward the use of constructive modalities with alternative materials. The infrastructure sector has started to invest research resources on waste materials in order to reuse them in the construction of roads. Materials coming from the demolition of existing structures are a valuable resource, as they limit the use of raw materials reducing environmental impact. The construction of road pavements requires a high amount of energy and nonrenewable materials. For this reason, over recent decades, the use of recycled and/or reused materials is increased to develop sustainable products in this field. The most commonly used recycling materials are derived from the demolition and steel industry waste, which can be reused in different percentages as aggregates in asphalt mixtures (RAP, steel slag, ceramics) in place of the virgin mineral aggregates [1]
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