Influence of concrete cover in the service life of a newly built reinforced concrete structure: a case study
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(2020) 5:9
RESEARCH ARTICLE
Influence of concrete cover in the service life of a newly built reinforced concrete structure: a case study Matheus Rocha da Silva1 · Abrahão Bernardo Rohden1 · Esequiel Fernandes Teixeira Mesquita2 · Monica Regina Garcez3 Received: 19 November 2019 / Accepted: 3 January 2020 © Springer Nature Switzerland AG 2020
Abstract 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. Keywords Lifetime · Durability · Concrete cover · Water/cement ratio · Slabs · Columns
1 Introduction In the past four decades, the owner requirements related to durability, service-life, and structural performance of reinforced concrete (RC) structures have increased significantly. Considering that compressive strength and other mechanical properties are not enough requirements to assess the structural performance, the concept of durability has been refreshed and now can be considered strictly connect with the concept of structural performance. Following, the time was also added to structural performance assessment methodology, making emerges the concept of service-life [1]. Indeed, a considerable number of approaches aiming to forecast the service life of RC structures have been reported * Monica Regina Garcez [email protected] 1
Regional University of Blumenau, Blumenau, Brazil
2
Federal University of Ceará, Russas Campus, Russas, Brazil
3
Federal University of Rio Grande Do Sul, Porto Alegre, Brazil
in the literature, including the probabilistic approach included [2-5]. On the other hand, different approaches such as factorial described in ISO 16686-1 [2] and forecast mathematic models to corrosion and carbonatation [6, 7] can also be used. The Brazilian Standard NBR 6118 [8], following t
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