Experimental investigation on existing precast prc elements strengthened with cementitious composites

Carlos Pellegrino, Giorgio Giacomin, Rafael Alberto Perlo

Resumen


A number of experimental investigations on fibre reinforced polymer (FRP), with the aim of understanding their behaviour when applied as strengthening of reinforced concrete elements, are available in the literature but very few information is available on strengthening real-scale elements with cementitious composites. In particular design code formulations are scanty or non-existent.
In this study the behaviour of four precast pre-stressed TT beams taken from an existing industrial building was investigated. One of them was considered as control unstrengthened TT beam, whereas the others were strengthened with different techniques, namely with FRP laminates (glued with epoxy resin), carbon fibres with cementitious matrix and steel fibres with cementitious matrix. Each material involved in this study was also mechanically characterized to obtain the main physical properties. Adequate specimens were obtained from the existing TT beam to characterize the concrete and the reinforcing steel bars.

Palabras clave


cementitious composite; existing precast prc elements; carbon fibres; steel fibres.

Texto completo:

PDF

Referencias


AMERICAN CONCRETE INSTITUTE (ACI), “Guide for the design and construction of externally bonded FRP systems for strengthening of concrete structure”, ACI 440.2R-08, Farmington Hill, Mich., 2008.

fib BULLETIN 14, “Externally bonded FRP reinforcement for RC structures”, CH-1015, Lausanne, 2001.

CONSIGLIO NAZIONALE DELLE RICERCHE (CNR), “Instructions for design, execution and control of strengthening interventions through fiber-reinforced composites.” CNR-DT 200- 04, Consiglio Nazionale delle Ricerche, Rome, Italy, 2004.

PELLEGRINO C., MODENA C. “Flexural strengthening of real-scale RC and PRC beams with end-anchored pre-tensioned FRP laminates”, ACI Structural Journal, Vol. 106, N. 3, 2009, pp. 319-328.

JESSE, F., SCHICKTANZ, K., CURBACH, M., “Obtaining Characteristic Material Strength of Textile Reinforced Concrete (TRC) from Laboratory Tests”, 9th International Symposium on Ferrocement (Ferro9), Bali, May 18-20, 2009, pp. 305-318.

JESSE, F., WEILAND, S. AND CURBACH, M. “Flexural strengthening of rc-structures with textile reinforced concrete, Textile Reinforced Concrete (TRC) -- German/International Experience”, Proceedings of ACI Fall Convention. Kansas City, November 2005, A. Dubey editors, ACI Special Publication, SP-250CD-4.

HÄUßLER-COMBE, U., HARTIG, J. “Bond and failure mechanisms of textile reinforced concrete (TRC) under uniaxial tensile loading”, Cement and Concrete Composites, Vol. 2, N. 4, 2007, pp. 279-289.

BRUCKNER A., ORTLEPP R., CURBACH M. “Textile Reinforced Concrete for strengthening in bending and shear”, Materials and Structures, Vol. 39, N. 8, 2006, pp. 741–748.

HEGGER J., WILL N., BRUCKERMANN O., VOSS S. “Load- bearing behaviour and simulation of Textile Reinforced Concrete”, Materials and Structures, Vol. 39, 2006, pp. 765– 776.

PELLEGRINO C., DA PORTO F., MODENA C. “Rehabilitation of reinforced concrete axially loaded elements with polymer-modified cementitious mortar", Construction and Building Materials, Vol. 23, N. 10, 2009, pp. 3129-3137.

PELLEGRINO C., DA PORTO F., MODENA C. “Experimental behaviour of reinforced concrete elements repaired with polymer-modified cementitious mortar”, Materials and Structures, Vol. 44, N. 2, 2011, pp. 517-527.

ASTM, “Standard test method for obtaining and testing drilled cores and sawed beams of concrete”, ASTM C42/C42M-11, American society for testing and materials, 2011.

CEN, “Eurocode 2: Design of Concrete Structures - Part 1-1: General Rules and Rules for Buildings,” ENV 1992-1-1 2004, Comité Européen de Normalisation, Brussels, Belgium, 2004.

UNI, “Methods of test for mortar for masonry - Part 11: Determination of flexural and compressive strength of hardened mortar”, UNI EN 1015-11:2007, Ente Nazionale Italiano di Unificazione, 2007.




DOI: https://doi.org/10.23878/alternativas.v17i3.214

© Universidad Católica de Santiago de Guayaquil