The main objectives of the European road administrations are to develop long-term bituminous pave... more The main objectives of the European road administrations are to develop long-term bituminous pavements and guarantee the environmental preservation. These objectives include the development of new solutions, technically and environmentally sustainable, which can be reached simultaneously through the promotion of the use of recycled polymers in bituminous mixtures, in order to improve its performance and the durability of the pavement. Thus, this work will contribute to the improvement of life quality through the integration of recycled polymers in bituminous mixtures, mainly when its use is more difficult or not so viable in other industries. In fact, many recycled polymers are sent to landfill, incinerated or used as reducing agents in furnaces. They could be applied with larger technical, economic and environmental advantages in the construction of road pavements. These residues can work as additives to be introduced in bituminous binders (polyethylene, PE) or as aggregates in bit...
International Journal of Pavement Research and Technology, 2020
Road paving recycling has been acquiring more relevance in society, especially within the paradig... more Road paving recycling has been acquiring more relevance in society, especially within the paradigm of a circular economy. The addition of waste materials in asphalt mixtures is an excellent solution to face the gradual emergence of a great diversity of waste materials and reduce the production costs. This study aims to evaluate the addition of commercial and laboratory-produced polymer modified binders as rejuvenators in recycled asphalt mixtures with high contents of reclaimed asphalt pavement material (RAP). A commercial polymer modified binder (PMB) and a conventional bitumen modified with 5% of styrene-butadiene-styrene (SBS) or 4% of Regefalt were added to RAP aged bitumen and compared with a rejuvenated binder. Fatigue, permanent deformation and water sensitivity tests carried out on recycled mixtures produced with those binders showed that polymer modified binders could be used as rejuvenators to improve their performance significantly. The recycled asphalt mixture produced w...
Various researchers are developing efforts to integrate waste and by-products as alternative mate... more Various researchers are developing efforts to integrate waste and by-products as alternative materials in road construction and maintenance, reducing environmental impacts and promoting a circular economy. Among the alternative materials that several authors have studied regarding their use as partial or total substitutes for natural aggregates in the asphalt paving industry, the steel slag aggregate (SSA) and recycled concrete aggregate (RCA) from construction demolition waste (CDW) stand out. This paper reviews and discusses the characteristics and performance of these materials when used as aggregates in asphalt mixtures. Based on the various studies analyzed, it was possible to conclude that incorporating SSA or RCA in asphalt mixtures for road pavements has functional, mechanical, and environmental advantages. However, it is essential to consider some possible drawbacks of these aggregates that are discussed in this paper, to define the acceptable uses of SSA and RCA as sustain...
The mechanical performance of a typical surface course mixture, modified with two different plast... more The mechanical performance of a typical surface course mixture, modified with two different plastic wastes, both via the wet and dry processes, was evaluated in this study. Water sensitivity, rutting resistance, stiffness modulus, and fatigue cracking resistance tests were used. The results obtained indicated that the polymer-modified mixtures showed similar or improved performance when compared with that of a conventional control mixture produced with a harder virgin grade bitumen, not always available, or available at higher costs, in several countries. Thus, modifying asphalt mixtures with these plastic wastes can be an economical and ecological alternative for paving works. Moreover, the mixtures produced via the dry process showed increased water sensitivity and stiffness modulus properties. This holds out new possibilities for use of polymer-modified mixtures, especially in developing countries, because it widens the possibility of using locally available bitumen, of variable quality, for producing mixtures with higher performance. This can be achieved at real scale with no major extra costs because the dry process does not require modification of typical asphalt plants.
ABSTRACT Asphalt rubber (AR) mixtures are currently a material with an increasing use in road pav... more ABSTRACT Asphalt rubber (AR) mixtures are currently a material with an increasing use in road pavements due to their improved performance and environmental benefit of recycling rubber from used tires. AR binders have been widely applied, but the bitumen and rubber interactions remain poorly understood. The aim of this work is to quantify and correlate the changes in bitumen and rubber during AR binders’ production, in order to characterize the interactions between the AR constituent materials, e.g. residual bitumen and recovered rubber. A good correlation between the rheological and physical changes in the properties of rubber, bitumen and AR binder was observed.
Hugo Silva * Research Assistant, Department of Civil Engineering, University of Minho, Guimarães,... more Hugo Silva * Research Assistant, Department of Civil Engineering, University of Minho, Guimarães, Portugal * University of Minho, Department of Civil Engineering, Campus de Azurém, 4800-058 Guimarães, Portugal hugo@civil.uminho.pt ... Jorge Pais Assistant ...
... Paulo AA Pereira1†, Jorge C. Pais, Elisabete F. Freitas, Hugo MD Silva, Joel RM Oliveira2 ...... more ... Paulo AA Pereira1†, Jorge C. Pais, Elisabete F. Freitas, Hugo MD Silva, Joel RM Oliveira2 ... A seguir apresentam-se dois casos de estudo de reciclagem de pavimentos, na reabilitação de pavimentos (Pereira & Picado-Santos, 2006): i) reciclagem a quente em central; ii ...
The main objectives of the European road administrations are to develop long-term bituminous pave... more The main objectives of the European road administrations are to develop long-term bituminous pavements and guarantee the environmental preservation. These objectives include the development of new solutions, technically and environmentally sustainable, which can be reached simultaneously through the promotion of the use of recycled polymers in bituminous mixtures, in order to improve its performance and the durability of the pavement. Thus, this work will contribute to the improvement of life quality through the integration of recycled polymers in bituminous mixtures, mainly when its use is more difficult or not so viable in other industries. In fact, many recycled polymers are sent to landfill, incinerated or used as reducing agents in furnaces. They could be applied with larger technical, economic and environmental advantages in the construction of road pavements. These residues can work as additives to be introduced in bituminous binders (polyethylene, PE) or as aggregates in bit...
International Journal of Pavement Research and Technology, 2020
Road paving recycling has been acquiring more relevance in society, especially within the paradig... more Road paving recycling has been acquiring more relevance in society, especially within the paradigm of a circular economy. The addition of waste materials in asphalt mixtures is an excellent solution to face the gradual emergence of a great diversity of waste materials and reduce the production costs. This study aims to evaluate the addition of commercial and laboratory-produced polymer modified binders as rejuvenators in recycled asphalt mixtures with high contents of reclaimed asphalt pavement material (RAP). A commercial polymer modified binder (PMB) and a conventional bitumen modified with 5% of styrene-butadiene-styrene (SBS) or 4% of Regefalt were added to RAP aged bitumen and compared with a rejuvenated binder. Fatigue, permanent deformation and water sensitivity tests carried out on recycled mixtures produced with those binders showed that polymer modified binders could be used as rejuvenators to improve their performance significantly. The recycled asphalt mixture produced w...
Various researchers are developing efforts to integrate waste and by-products as alternative mate... more Various researchers are developing efforts to integrate waste and by-products as alternative materials in road construction and maintenance, reducing environmental impacts and promoting a circular economy. Among the alternative materials that several authors have studied regarding their use as partial or total substitutes for natural aggregates in the asphalt paving industry, the steel slag aggregate (SSA) and recycled concrete aggregate (RCA) from construction demolition waste (CDW) stand out. This paper reviews and discusses the characteristics and performance of these materials when used as aggregates in asphalt mixtures. Based on the various studies analyzed, it was possible to conclude that incorporating SSA or RCA in asphalt mixtures for road pavements has functional, mechanical, and environmental advantages. However, it is essential to consider some possible drawbacks of these aggregates that are discussed in this paper, to define the acceptable uses of SSA and RCA as sustain...
The mechanical performance of a typical surface course mixture, modified with two different plast... more The mechanical performance of a typical surface course mixture, modified with two different plastic wastes, both via the wet and dry processes, was evaluated in this study. Water sensitivity, rutting resistance, stiffness modulus, and fatigue cracking resistance tests were used. The results obtained indicated that the polymer-modified mixtures showed similar or improved performance when compared with that of a conventional control mixture produced with a harder virgin grade bitumen, not always available, or available at higher costs, in several countries. Thus, modifying asphalt mixtures with these plastic wastes can be an economical and ecological alternative for paving works. Moreover, the mixtures produced via the dry process showed increased water sensitivity and stiffness modulus properties. This holds out new possibilities for use of polymer-modified mixtures, especially in developing countries, because it widens the possibility of using locally available bitumen, of variable quality, for producing mixtures with higher performance. This can be achieved at real scale with no major extra costs because the dry process does not require modification of typical asphalt plants.
ABSTRACT Asphalt rubber (AR) mixtures are currently a material with an increasing use in road pav... more ABSTRACT Asphalt rubber (AR) mixtures are currently a material with an increasing use in road pavements due to their improved performance and environmental benefit of recycling rubber from used tires. AR binders have been widely applied, but the bitumen and rubber interactions remain poorly understood. The aim of this work is to quantify and correlate the changes in bitumen and rubber during AR binders’ production, in order to characterize the interactions between the AR constituent materials, e.g. residual bitumen and recovered rubber. A good correlation between the rheological and physical changes in the properties of rubber, bitumen and AR binder was observed.
Hugo Silva * Research Assistant, Department of Civil Engineering, University of Minho, Guimarães,... more Hugo Silva * Research Assistant, Department of Civil Engineering, University of Minho, Guimarães, Portugal * University of Minho, Department of Civil Engineering, Campus de Azurém, 4800-058 Guimarães, Portugal hugo@civil.uminho.pt ... Jorge Pais Assistant ...
... Paulo AA Pereira1†, Jorge C. Pais, Elisabete F. Freitas, Hugo MD Silva, Joel RM Oliveira2 ...... more ... Paulo AA Pereira1†, Jorge C. Pais, Elisabete F. Freitas, Hugo MD Silva, Joel RM Oliveira2 ... A seguir apresentam-se dois casos de estudo de reciclagem de pavimentos, na reabilitação de pavimentos (Pereira & Picado-Santos, 2006): i) reciclagem a quente em central; ii ...
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