Gonzalo Valdés

Optimized phenolic-rich bio-oil from Kraft lignin pyrolysis as a sustainable additive for asphalt binders

José R. Colina, Cristina Segura, Alex Ariel Fernández-Andrade, José L. Concha et autres

Technical lignin represents an abundant industrial by-product with significant potential for valorization into sustainable functional materials. In this study, Kraft lignin was selectively converted into phenolic-rich bio-oils through optimized slow pyrolysis and subsequently upgraded into a bio-based antioxidant additive for asphalt binders. …

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Enhancing rheological and ageing performance of asphalt binders using hazelnut shell biochar additives

Camila Martínez-Toledo, Gonzalo Valdés, Alejandra Calabi-Floody, María Eugenia González et autres

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Industrial Validation and Mechanical Characterization of SMA Mixtures Stabilized with Recycled Polymeric Fibers from Waste Tires

Alejandra Calabi-Floody, Gonzalo Valdés, Cristian Mignolet-Garrido, Cristian Díaz-Montecinos et autres

This study investigates the industrial validation of a granular additive derived from waste tire textile fibers (WTTF) developed to replace the conventional cellulose stabilizing additive in stone mastic asphalt (SMA) mixtures while enhancing their mechanical performance. Building on previous laboratory-scale findings, this …

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Determination of the Social Contribution of Sustainable Additives for Asphalt Mixes Through Fuzzy Cognitive Mapping

Leonardo A. Sierra, Alejandra Calabi-Floody, Gonzalo Valdés, Víctor Yepes et autres

Assessing infrastructure sustainability requires an evaluation of technical, economic, environmental, and social dimensions, with the latter often being overlooked. Asphalt mixtures incorporating end-of-life tire textile fiber additives in Chile have emerged as a sustainable alternative to conventional fibers. However, the social sustainability …

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Optimising slow pyrolysis parameters to enhance biochar European hazelnut shell as a biobased asphalt modifier

Camila Martínez-Toledo, Gonzalo Valdés, Alejandra Calabi-Floody, María Eugenia González et autres

This paper evaluated the impact of operational conditions during slow pyrolysis on the physicochemical and antioxidant properties of biochar derived from European hazelnut shells (BH), with the aim of assessing its potential as a modifier for asphalt binder . The study employed …

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Optimised biopolymer-based capsules for enhancing the mechanical and self-healing properties of asphalt mixtures

José Norambuena-Contreras, José L. Concha, Gonzalo Valdés, Clare Wood

Abstract The growing need to enhance our road infrastructure has driven the development of several innovative techniques in recent years. Among these advancements, encapsulated rejuvenator solutions for extrinsic self-healing asphalt have emerged as a significant topic of interest. This paper evaluates the …

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Evaluation of Rheological Properties of Asphalt Binder Modified with Biochar from Oat Hulls

Camila Martínez-Toledo, Gonzalo Valdés, Alejandra Calabi-Floody, María Eugenia González et autres

In this study, the effect of biochar from oat hulls (BO) on the rheological properties of a PG 64-22 asphalt binder was evaluated using a full factorial design, which included the following factors: pyrolysis temperature (PT) (300 °C and 500 °C), BO …

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Enhancing Fatigue Resistance in Asphalt Mixtures with a Novel Additive Derived from Recycled Polymeric Fibers from End-of-Life Tyres (ELTs)

Gonzalo Valdés, Alejandra Calabi-Floody, Cristian Mignolet-Garrido, Cristobal Bravo-Espinoza

Waste-tire textile fibers (WTTF) represent a challenge for the recycling industry since there are currently very few alternatives for their use. In this study, an evaluation of the effect of a new additive developed in two granular formats from WTTF on the …

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Determination of the Social Contribution of Sustainable Asphalt Mixes

Leonardo A. Sierra, Gonzalo Valdés, Alejandra Calabi-Floody, Leonardo Lleuful-Cruz et autres

The social contribution that infrastructure components contribute to a territory tends to be underestimated. Indeed, few studies referring to asphalt pavements take social impact into account in their evaluation. This study proposes and evaluates a method to estimate the social contribution of …

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Effect of a New Additive Based on Textile Fibres from End-of-Life Tyres (ELT) on the Mechanical Properties of Stone Mastic Asphalt

Gonzalo Valdés, Alejandra Calabi-Floody, Cristian Mignolet-Garrido, Cristian Díaz-Montecinos

Stone Mastic Asphalts (SMA) are asphalt mixes with discontinuous granulometry and a high content of asphalt binder. In order to prevent draindown of the asphalt binder and ensure good performance, these mixes must be strengthened with cellulose or mineral fibres and/or polymer …

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Life Cycle Assessment of Natural Zeolite-Based Warm Mix Asphalt and Reclaimed Asphalt Pavement

Aner Martínez-Soto, Alejandra Calabi-Floody, Gonzalo Valdés, Andrea Hucke et autres

Today, an important part of paved surfaces in the world uses asphalt mixtures. This practice increases the use of aggregates and fossil fuels, the availability of which is limited. Most of the studies referring to asphalt mixtures reported and compared the mechanical …

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Evaluation of the effects of textile fibre derived from end-of-life tyres (TFELT) on the rheological behaviour of asphalt binders

Alejandra Calabi-Floody, Cristian Mignolet-Garrido, Gonzalo Valdés

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