Latest revision as of 16:17, 30 November 2021

Abstract

The urban development of Lota city (Chile) was strongly influenced by the coal-mining industry during 19th and 20th century. Virtually, the entire city was built, initially, by Matias Cousiño’s Coal Company and, later, by the National Coal Company of Chile (ENACAR). At the beginning of the 21st century, the city began to experience a decline because of the closure of coal mines. This situation affected not only the economy and employment of the city, but also the maintenance of its infrastructure and the conservation of historical buildings. The “Anibal Pinto Building” is a 5 stories reinforced concrete and masonry structure, built in 1966. Besides of an aggressive coastal environment and poor maintenance, this building has experienced one major earthquake (Mw 8.8 in 2010). As a consequence, cracks, concrete spalding and reinforcement corrosion is observed in several structural elements. To evaluate the current state of the building and determine it remaining operation life, a structural assessment procedure was implemented based on field explorations, laboratory analysis and numerical modeling. Field explorations considered tests to identify carbonation, humidity, porosity, concrete hardness. While, laboratory analysis included compression test of concrete cores extracted from the building. These investigations were developed with the aim of determine the mechanical properties of buildings materials and for identifying pathologies that affects reinforced concrete. The experimental data was used to elaborate a finite element model in SAP 2000 to estimate building performance compared to the current seismic regulation in Chile.

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References

[1] Mark G. Stewart, Xiaoming Wang, Minh N. Nguyen. Climate change adaptation for corrosion control of concrete infrastructure. Structural Safety 35 (2012) 29–39

[2] Seung-Jun Kwon, Ha-Won Song. Analysis of carbonation behavior in concrete using neural network algorithm and carbonation modeling. Cement and Concrete Research 40 (2010) 119–127.

[3] I. Monteiro, F.A. Branco, J. de Brito, R. Neves. Statistical analysis of the carbonation coefficient in open air concrete structures. Construction and Building Materials 29 (2012) 263–269

[4] P.F. Marques, A. Costa. Service life of RC structures: Carbonation induced corrosion. Prescriptive vs. performance-based methodologies. Construction and Building Materials 24 (2010) 258–265

[5] Sang-Hun Han, Woo-Sun Park, Eun-Ik Yang. Evaluation of concrete durability due to carbonation in harbor concrete structures. Construction and Building Materials 48 (2013) 1045–1049

[6] Anna V. Saetta, Renato V. Vitaliani. Experimental investigation and numerical modeling of carbonation process in reinforced concrete structures Part I: Theoretical formulation. Cement and Concrete Research 34 (2004) 571–579

[7] H. Kuosa, R.M. Ferreira, E. Holt, M. Leivo, E. Vesikari. Effect of coupled deterioration by freeze–thaw, carbonation and chlorides on concrete service life. Cement & Concrete Composites 47 (2014) 32–40

[8]Dodge Woodson, R. (2009). Concrete Structures: Protection, Repair and Rehabilitation.Burlington, USA: Butterworth-Heinemann imprint of Elsevier.

[9] Talakokula, S. Bhalla, R.J. Ball, C.R. Bowen, G.L. Pesce, R. Kurchania, B. Bhattacharjee, A. Gupta, K. Paine. Diagnosis of carbonation induced corrosion initiation and progressionin reinforced concrete structures using piezo-impedance transducers. Sensors and Actuators A 242 (2016) 79–91

[10] Alexander Steffens, Dieter Dinkler, Hermann Ahrens. Modeling carbonation for corrosion risk prediction of concrete structures. Cement and Concrete Research 32 (2002) 935–941

[11] Astroza M., S. Ruiz and R. Astroza, 2012, Damage Assessment and Seismic Intensity Analysis of the 2010 (Mw8.8) Maule Earthquake, Submitted to Earthquake Spectra.

[12] CYTED. (2006). “4ta Edición del Manual de inspección, evaluación y diagnóstico de corrosión en estructuras de hormigón armado”. Programa Iberoamericano de ciencia y tecnología para el desarrollo.

[13] Ha-Won Song, Seung-Jun Kwon. Permeability characteristics of carbonated concrete considering capillary pore structure. Cement and Concrete Research 37 (2007) 909–915

[14] M.A. Peter, A. Muntean, S.A. Meier, M. Böhm. Competition of several carbonation reactions in concrete: A parametric study. Cement and Concrete Research 38 (2008) 1385–1393

[15] J. Khunthongkeaw , S. Tangtermsirikul , T. Leelawat. A study on carbonation depth prediction for fly ash concrete. Construction and Building Materials 20 (2006) 744–753.

[16] W. Aperador, R. Mejía de Gutiérrez, D.M. Bastidas. Steel corrosion behaviour in carbonated alkali-activated slag concrete. Corrosion Science 51 (2009) 2027–2033

[17] In-Seok Yoon, Oguzhan C- opuroglu, Ki-Bong Park. Effect of global climatic change on carbonation progress of concrete. Atmospheric Environment 41 (2007) 7274–7285

[18] B.G. Salvoldi, H. Beushausen, M.G. Alexander. Oxygen permeability of concrete and its relation to carbonation. Construction and Building Materials 85 (2015) 30–37

[19] Cheng-Feng Chang, Jing-Wen Chen. The experimental investigation of concrete carbonation depth. Cement and Concrete Research 36 (2006) 1760– 1767