Evaluación del efecto rejuvenecedor de bio-materiales sobre ligantes para mezclas con alto contenido de asfalto recuperado

Abstract

ABSTRACT:The interest in using bio-materials in pavement engineering has grown significantly over the last decades due to environmental concerns about the use of non-recoverable natural resources. In this paper, biomaterials are used together with Reclaimed Asphalt (RA) to restore some of the properties of the aged bitumen present in mixtures with high RA content. For this purpose, two bio-materials are studied and compared to conventional and polymer modified bitumens. Blends of these materials with RA bitumen were produced and studied to simulate a 50% RA mixture. The rejuvenating effect of the two bio-materials on RA has been assessed and compared with the effect of the conventional binders. Apparent Molecular Weight Distribution of the samples (obtained by the δ-method) and different rheological parameters were used for this purpose. Results revealed the power of bio-materials to rejuvenate RA bitumen, showing their capability to be used as fresh binders in high-RA content mixtures. RESUMEN:Evaluación del efecto rejuvenecedor de bio-materiales sobre ligantes para mezclas con alto contenido de asfalto recuperado. El interés en la utilización de bio-materiales en ingeniería de pavimentos ha crecido significantemente en las últimas décadas debido a la conciencia ambiental sobre el uso de recursos naturales no renovables. En este artículo, se utilizan bio-materiales para recuperar las propiedades iniciales del betún envejecido presente en mezclas con alto contenido de asfalto reciclado (RA). Para ello, se ha estudiado y comparado el comportamiento de dos bio-materiales con betunes convencionales y betunes modificados con polímeros. Con este objetivo, se fabricaron mezclas de bio-materiales y betún reciclado simulando mezclas asfálticas con 50% de contenido de reciclado. El efecto rejuvenecedor de los bio-materiales se ha evaluado y comparado con el efecto rejuvenecedor de ligantes convencionales mediante el cálculo de las distribuciones de peso molecular aparente y diferentes pará-metro reológicos. Los resultados muestran el poder rejuvenecedor de los bio-materiales, poniendo de manifiesto su potencial para usarse como ligantes vírgenes en mezclas asfálticas con alto contenido de reciclado.

Dose Methodology and Rejuvenating Effect of a Plant-Based Biobinder in Aged Asphalt Binders

“…More than 90% of its composition corresponds to by-products from the forestry industry, and the remaining percentage consists of petroleum-based elastomeric polymers. This biobinder was used in previous studies as a total replacement for asphalt binder in asphalt mixtures without RAP ( 22 ), and with high RAP content (50%) ( 18 , 19 ); its standard characterization is presented in Table 1. In the current study, Biophalt was used as a substitute for the virgin asphalt binder to be incorporated in the recycled asphalt mixture.…”

“…This type of biomaterial tends to reduce the viscosity of the aged binder present in RAP ( 7 ), allowing incorporation of higher amounts of the recycled material in the mixtures ( 17 ). For rutting critical temperature, fatigue resistance, and rejuvenating effects, recycled mixtures using plant-based biobinders have produced results that are as good as those of recycled materials using softer asphalt binders ( 7 , 18 , 19 ).…”

Black Space Rheological Assessment of Asphalt Material Behavior

“…37,38 Further examples are bio-oils obtained from vegetable oils and biomass such as soy, linseed, and rapeseed. Other sources of bio-binders include algae, 39 wood residues, [40][41][42] and swine manure. 43 Another aspect to be considered is the complexity of the treatment before the employment of these renewable materials.…”

Biocomponent-Based Quality Improvement Opportunities of Binders for Road Construction

“…Peralta et al examined the application of red oak residues as direct alternative binders and to reduce the environmental impact of bituminous binders [17][18][19]. Grilli et al used pinewood biooil [20], Jiménez del Barco-Carrión et al used pine resin [21,22] and Lei et al used bio-oil derived from wood as a rejuvenator [23]. Raouf and Williams investigated the utilisation options of oak wood bio-oil [24].…”