resumo
This work addresses the preparation of bitumen blends using asphaltic residue, vacuum residue, and three aromatic extracts (by-products) from the refining process of base oils. A constrained mixture design was adopted to guide bitumen formulation. The measured responses were fitted to Scheffe polynomial models, namely a quadratic model for the penetration value and a linear model for the softening point. Both models were validated using ANOVA. In a second stage the quadratic model was used to design formulations with a precise penetration value. The predicted and measured responses demonstrate the accuracy of both models with average deviations of only 4.67% and 1,53% for penetration and softening point, respectively. In the whole, mixture design has been shown to be a successful and essential tool for bitumen formulation especially if the blends involve a large number of components. (C) 2017 Elsevier Ltd. All rights reserved.
palavras-chave
RESPONSE-SURFACE METHODOLOGY; POLYPHOSPHORIC ACID PPA; WARM MIX ASPHALT; CHEMICAL-COMPOSITION; PERFORMANCE; MODEL
categoria
Construction & Building Technology; Engineering; Materials Science
autores
Varanda, C; Portugal, I; Ribeiro, J; Silva, AMS; Silva, CM
nossos autores
Carlos Manuel Silva
Professor associado
Catarina Varanda
Estudante de doutoramento
Inês Portugal
Professor Auxiliaragradecimentos
This work was developed within the scope of the projects CICECO-Aveiro Institute of Materials (Ref. FCT UID/CTM /50011/2013) and UI QOPNA (Ref. FCT UID/QUI/00062/2013), financed by national funds through the FCT/MEC (Portugal) and when appropriate co-financed by FEDER (European Union) under the PT2020 Partnership Agreement and the Portuguese National NMR Network (RNRMN). Catarina Varanda also thanks the FCT/MEC (Portugal) for a PhD grant (SFRH/BDE/51420/2011).