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Simulation of hygral crack growth in concrete repair systems
Abstract In this paper, results of numerical simulations of a repaired concrete structure are presented. A repair layer of mortar was cast on top of a substrate of old concrete. The repair mortar was staturated with water, and allowed to dry at the top surface. The moisture distribution was determined using the finite element code DIANA. The moisture gradients lead to shrinkage cracking. Using the smeared crack model available in DIANA, and from the effect of decreasing the thickness of the overlay of repair mortar (from 60 to 15 mm), and by decreasing the bond strength between repair mortar and substrate from 3 to 1 MPa, it is shown that the number of hygral shrinkage cracks depends largely on the thickness of the repair layer. Moreover, in analyses with high interfacial strength, the cracks were found to propagate into the substrate. However, at lower bond strength, debonding was observed. The analyses show that hygral strains may cause severe damage in a repaired concrete system. Problems may decrease when the overlay thickness increases or when the bond between substrate and overlay is improved. In addition, applying reinforcement in the repair layer, either as discrete bars or as distributed fibres, may decrease the spacing and width of the shrinkage cracks, thereby reducing the probability of delamination. The numerical programme is shown to be a viable tool for damage analyses not only under mechanical load, but also under hygral gradients (and thermal gradients).
Simulation of hygral crack growth in concrete repair systems
Abstract In this paper, results of numerical simulations of a repaired concrete structure are presented. A repair layer of mortar was cast on top of a substrate of old concrete. The repair mortar was staturated with water, and allowed to dry at the top surface. The moisture distribution was determined using the finite element code DIANA. The moisture gradients lead to shrinkage cracking. Using the smeared crack model available in DIANA, and from the effect of decreasing the thickness of the overlay of repair mortar (from 60 to 15 mm), and by decreasing the bond strength between repair mortar and substrate from 3 to 1 MPa, it is shown that the number of hygral shrinkage cracks depends largely on the thickness of the repair layer. Moreover, in analyses with high interfacial strength, the cracks were found to propagate into the substrate. However, at lower bond strength, debonding was observed. The analyses show that hygral strains may cause severe damage in a repaired concrete system. Problems may decrease when the overlay thickness increases or when the bond between substrate and overlay is improved. In addition, applying reinforcement in the repair layer, either as discrete bars or as distributed fibres, may decrease the spacing and width of the shrinkage cracks, thereby reducing the probability of delamination. The numerical programme is shown to be a viable tool for damage analyses not only under mechanical load, but also under hygral gradients (and thermal gradients).
Simulation of hygral crack growth in concrete repair systems
Sadouki, H. (author) / van Mier, J. G. M. (author)
1997
Article (Journal)
Electronic Resource
English
SIMULATION OF HYGRAL CRACK GROWTH IN CONCRETE REPAIR SYSTEMS
| Online Contents | 1997
Simulation of hygral crack growth in concrete repair systems
| Springer Verlag | 1997
Simulation of Hygral Crack Growth in Concrete Repair Systems
| British Library Online Contents | 1997
Simulation of hygral crack growth in concrete repair systems
| Online Contents | 1997
"Analysis of hygral induced crack growth in multiphase materials"
| British Library Online Contents | 1996