Technical Report 11-DEC/E-13This work is supported by FEDER funds through the Operational Programme for Competitiveness Factors – COMPETE and National Funds through FCT – Portuguese Foundation for Science and Technology under the project PTDC/ECM/74337/2006. The authors acknowledge the materials generously supplied by Hilti Portugal - Produtos e Serviços Lda., S&P Clever Reinforcement Ibérica Lda. and SECIL
