Experimental validation of a framework for hygro-mechanical simulation of self-induced stresses in concrete
| Autor: | Luís Leitão, Miguel Azenha, Rui Faria, Joaquim A. O. Barros, Christoph Fernandes Sousa, José Luís Duarte Granja |
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| Přispěvatelé: | Universidade do Minho |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Work (thermodynamics)
Materials science 0211 other engineering and technologies Experimental research 020101 civil engineering 02 engineering and technology 0201 civil engineering Hygro-mechanical simulation 021105 building & construction General Materials Science Shrinkage Science & Technology Moisture business.industry Experimental data Building and Construction Structural engineering Internal humidity Characterization (materials science) Compressive strength Creep Internal heating business Concrete |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | An accurate simulation of the internal stresses that develop in concrete structures in service demands the explicit consideration of the internal heat and moisture movements that induce strains, which in turn have the potential to cause relevant internal stresses. Following a previous exploratory work from the authors, in which a thermo-hygro-mechanical simulation framework had been proposed, the present paper focuses on the validation of the proposed methodology through an experimental program targeted to assist prediction of the evolution of bulk drying shrinkage (and the corresponding internal stresses) in three specimens of different sizes. This paper presents the entire experimental program, which involved extensive concrete characterization using three distinct sizes of specimens, namely: moisture diffusion with internal humidity sensors, compressive strength, E-modulus, creep and shrinkage on three distinct specimen sizes. The program also included characterization of cement paste shrinkage, which was accomplished employing a newly proposed methodology based on the use of very thin specimens monitored with a handheld microscope. Finally, the obtained experimental data was used for partial validation of predictive capacities of the above mentioned simulation framework, mostly in regard to the prediction of bulk shrinkage. It is noted that the validation does not focus on thermal modelling, since this is a matter that has been addressed by the authors in previous works. Funding provided by the Portuguese Foundation for Science and Technology (FCT) to the Research Projects PTDC/ECM/099250/ 2008, EXPL/ECM-EST/1323/2013 and PTDC/ECM-EST/1056/2014 (POCI-01-0145-FEDER-016841), as well to the Research Units ISISE (POCI-01-0145-FEDER-007633) and CONSTRUCT (POCI-01-0145-FEDER-007457) is gratefully acknowledged. The second, third and fourth authors also acknowledge the PhD grants SFRH/BD/76183/ 2011, SFRH/BD/80682/2011 and PD/BD/52657/2014, respectively, provided by FCT. A word of acknowledgment is also given to the help provided by Margarida Vieira, who assisted the experimental work in the course of her MSc thesis. info:eu-repo/semantics/publishedVersion |
| Databáze: | OpenAIRE |
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