@conference {13379, title = {Influ{\^e}ncia da Variabilidade de Agregados Reciclados de Bet{\~a}o na Fiabilidade de Estruturas de Bet{\~a}o}, booktitle = {3{\textordmasculine} Congresso Luso-Brasileiro Materiais de Constru{\c c}{\~a}o Sustent{\'a}veis}, year = {2018}, note = {

REFER{\^E}NCIAS [1] NKB/SAKO, NKB1999:01E Basis of design of structures. Proposals for modification of partial safety factors in Eurocodes, I.-B. 1999, Nordic Committee on Building Regulations (NBK): Oslo, Norway, 90 pages. [2] Holick{\'y}, M., J. Retief, and J. Wium, Partial factors for selected reinforced concrete members: background to a revision of SANS 10100-1. Journal of the South African Institution of Civil Engineering, 2010. 52: pp. 36-44. [3] Sedlacek, G., J. Brozzetti, and G. Hanswillle, Relationship between Eurocode 1 and the {\guillemotleft}material{\guillemotright} oriented Eurocodes. IABSE reports, 1996. 74: pp. 121-140. [4] BRE, Client report 210297. An independent technical expert review of the SAKO Report, H. Gulvanessian, J.A. Calgaro, P. Spehl, and B. Jensen, 2003, BRE: Watford, United Kingdom, 222 pages. [5] Gulvanessian, H., P. Formichi, and J.A. Calgaro, Designers{\textquoteright} guide to Eurocode 1: Actions on buildings. Designers{\textquoteright} Guide to the Eurocodes. 2009, London, United Kingdom: Thomas Telford, 266 pages. [6] EN-1990, Eurocode 0: Basis of structural design. 2002, Comit{\'e} Europ{\'e}en de Normalisation (CEN): Brussels, Belgium, 87 pages.[7] Mehta, P.K. and P.J. Monteiro, Concrete: microstructure, properties and materials (3rd edition). 2006: McGraw-Hill 684 pages. [8] Xiao, J., J. Li, and C. Zhang, On statistical characteristics of the compressive strength of recycled aggregate concrete. Structural Concrete, 2005. 6(4): pp. 149-153. [9] Etxeberria, M., E. Vazquez, A. Mari, and M. Barra, Influence of amount of recycled coarse aggregates and production process on properties of recycled aggregate concrete. Cement and Concrete Research, 2007. 37(5): pp. 735-742. [10] Xiao, J., K. Zhang, and Q. Xie, Reliability Analysis for Flexural Capacity of Recycled Aggregate Concrete Beams. Structural Engineering International, 2016. 26(2): pp. 121-129. [11] Henry, M., K. Hagiwara, T. Nishimura, and Y. Kato, Effect of recycled aggregate quality on variation and estimation of concrete strength. Proceedings of the Japan Concrete Institute, 2011. 33(1): pp. 1535-1540. [12] JCSS, Probabilistic Model Code, in Part 3: Material properties. 2001. [13] ACI, ACI 214R-11: Guide to evaluation of strength test results of concrete. 2011: Farmington Hills, Michigan, 20 pages. [14] Foster, S.J., M.G. Stewart, M. Loo, M. Ahammed, and V. Sirivivatnanon, Calibration of Australian Standard AS3600 Concrete Structures: part I statistical analysis of material properties and model error. Australian Journal of Structural Engineering, 2016. 17(4): pp. 242-253. [15] Nowak, A.S. and M. Szerszen, Calibration of Design Code for Buildings (ACI 318): Part 1{\textemdash}Statistical Models for Resistance. ACI Structural Journal, 2003. 100(3). [16] EN-1097-6, Tests for mechanical and physical properties of aggregates. Determination of particle density and water absorption. 2013, Comit{\'e} Europ{\'e}en de Normalisation (CEN): Brussels, Belgium, 54 pages. [17] Rodrigues, F., L. Evangelista, and J. de Brito, A new method to determine the density and water absorption of fine recycled aggregates. Materials Research, 2013. 16: pp. 1045-1051. [18] EN-12390-3, Testing hardened concrete. Compressive strength of test specimens. 2009, Comit{\'e} Europ{\'e}en de Normalisation (CEN): Brussels, Belgium, 22 pages. [19] EN-12390-6, Testing hardened concrete: Tensile splitting strength of test specimens. 2009, Comit{\'e} Europ{\'e}en de Normalisation (CEN): Brussels, Belgium, 14 pages. [20] Silva, R., J. De Brito, and R. Dhir, Tensile strength behaviour of recycled aggregate concrete. Construction and Building Materials, 2015. 83: pp. 108-118. [21] Silva, R., J. De Brito, and R. Dhir, The influence of the use of recycled aggregates on the compressive strength of concrete: a review. 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}, month = {14-16 de feverei}, address = {Coimbra, Portugal}, abstract = {

A produ{\c c}{\~a}o de bet{\~a}o com substitui{\c c}{\~a}o de agregados naturais por agregados reciclados minimiza os impactes da ind{\'u}stria da constru{\c c}{\~a}o. Contudo, o recurso a este tipo de agregado {\'e} limitado devido a d{\'u}vidas dos diferentes agentes da ind{\'u}stria da constru{\c c}{\~a}o e {\`a} aus{\^e}ncia de regulamenta{\c c}{\~a}o espec{\'\i}fica para o projecto de bet{\~a}o com agregados reciclados. A percep{\c c}{\~a}o de bet{\~o}es com agregados reciclados como um material heterog{\'e}neo com comportamento imprevis{\'\i}vel {\'e} o principal entrave, quer para a aceita{\c c}{\~a}o da ind{\'u}stria, quer para o desenvolvimento de regulamenta{\c c}{\~a}o. Diferentes aspectos relacionados com o efeitos da variabilidade das propriedades de bet{\~a}o com agregados reciclados na regulamenta{\c c}{\~a}o de estruturas s{\~a}o abordados conceptualmente: a heterogeneidade dos agregados reciclados, o efeito desta heterogeneidade nas propriedades mec{\^a}nicas de bet{\~a}o e os efeitos da variabilidade das propriedades de bet{\~a}o na sua fiabilidade estrutural. Os primeiros resultados de uma campanha experimental desenvolvida especificamente para abordar o efeito de agregados grossos reciclados na fiabilidade s{\~a}o apresentados e as suas implica{\c c}{\~o}es no projecto de estruturas discutidas. S{\~a}o apresentadas sugest{\~o}es de desenvolvimentos futuros que visam a calibra{\c c}{\~a}o de coeficientes parciais de seguran{\c c}a que possibilitem o projecto de estruturas de bet{\~a}o armado dimensionadas segundo o formato do Euroc{\'o}digo 2 e mantendo os mesmos n{\'\i}veis de seguran{\c c}a de bet{\~a}o convencional.

}, keywords = {Bet{\~a}o com agregados reciclados, Regulamenta{\c c}{\~a}o, Fiabilidade estrutural}, author = {Pacheco, Jo{\~a}o Nuno and Jorge de Brito and Chastre, Carlos and Evangelista, Lu{\'\i}s} }