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Escola Engenharia, P. Pós-graduação (2001)
CONTRIBUIÇÃO À PREVISÃO DA VIDA ÚTIL DAS ESTRUTURAS DE CONCRETO ARMADO ATACADAS PELA CORROSÃO DE ARMADURAS: INICIAÇÃO POR CLORETOS
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14 – Specification and achievement of cover to reinforcement
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Edificações habitacionais—desempenho
Structural collapse of civil engineering structures at an early age, as for instance bridges, tunnels and buildings, can present a high impact on economic issues of cities around the world, which emerges the necessity of early corrective maintenance and deep interventions. In this context, recent years, new studies and strategies focused on the durability of reinforced concrete structures have been developed. This case study aims to estimate the residual service life of a newly constructed reinforced concrete structure based on in-situ measurements of concrete cover, performed in 1662 points of columns and slabs to assess the impact of possible divergences between designed and as-built structural elements. Results show that a combination of concrete cover lower than the minimal and water/cement ratio higher than the maximum specified by Brazilian standards resulted in service life under 50 years in 53.8% of the inspected points of columns and 100% of the inspected points of waffle slabs. Even inspected points with concrete cover higher than the minimum requirement of the Brazilian design standard resulted in residual service life under 50 years. In critical points, the estimated residual service life resulted in 9.5 years for columns and 20 years for waffle slabs, which is far below the expected performance for a newly built reinforced concrete structure.
Journal of Building Pathology and Rehabilitation – Springer Journals
Published: Jan 8, 2020
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