Chloride diffusivity accounting for shortening strain effects in RC structures

  1. Enrico Zacchei 1
  2. Caio G. Nogueira 1
  1. 1 Universidade Estadual Paulista
    info

    Universidade Estadual Paulista

    São Paulo, Brasil

    ROR https://ror.org/00987cb86

Actes de conférence:
Proceedings 3rd International Conference on Recent Advances in Nonlinear Design Resilience and Rehabilitation of Structures
  1. Helena Barros (ed. lit.)
  2. Carla Ferreira (ed. lit.)
  3. José M. Adam (ed. lit.)
  4. Norb Delatte (ed. lit.)

ISBN: 9789892098371,  9789892098388

Année de publication: 2019

Pages: 302-310

Congreso: 3rd International Conference on Recent Advances in Nonlinear Design Resilience and Rehabilitation of Structures (16-18 October 2019, Coimbra)

Type: Communication dans un congrès

GOOGLE SCHOLAR

Résumé

In the last decade, Reinforced Concrete (RC) (steel bar + concrete, and/or additives)in structures has been widely studied. Structures are subjected to internal and external actionsaffecting their performance, serviceability and safety. Moreover, RC structures are subjected todegradations by chemical (e.g. corrosion), physical and/or mechanical processes (e.g. diffusionof chloride ions). The aim of this study is to investigate the chloride ions diffusion in sound andcracked concrete under compressive loads in accordance to Eurocode. The governing equationsare modified to account for the non-constant chloride diffusion coefficient. With this conditionit is possible to define several terms in the time-domain to predict the service life of structures.The considered material is a saturated and hardened cement paste under non-steady-stateconditions. Loads are studied for linear and non-linear states, whereas the model is developedby analytical and computational analyses. A satisfactory calibration between the observationsand modelling output has been obtained. Results show that the predicted values at the depth ofthe steel reinforcement ranges from 0.1% to 0.3% of concrete weight in 7-20 years; the ratio ofthe chloride diffusion coefficient under loading and no-loading is about 9, whereas the chloridediffusivity coefficient in cracks is 0.9-1.3 times the chloride diffusion coefficient under loading.

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