High performance cementitious compounds and their application as transition substrate for beams
Abstract
High performance cementitious compounds and their application as transition substrate for beams
ABSTRACT
This study presents the development and analysis of the behavior of high performance cementitious compounds reinforced with fibers. The material described was specifically developed for its application as a transition substrate, meaning, a repair layer that forms the tensed span of the flexion reinforced concrete beams with carbon fiber reinforced polymers (CFRP). Nineteen different compounds were produced by the hybridization process. The volume of the short fibers and of the steel microfibers varied. To analyze the behavior of the flexural material, tests were done in three points in tests tubes with their notches. The response of the material was analyzed considering the tenacity parameters (to flexion and fracture). The high performance of the compounds through the behavior of pseudo-hardening was confirmed.
Keywords:Â cementitious compounds; concrete beams; transition substrate.
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Compuestos cementÃceos de alto desempeño para su aplicación como sustrato de transición en vigas
RESUMEN
Este estudio muestra el desarrollo y análisis del comportamiento de los materiales compuestos de cemento reforzado con fibras de alto rendimiento. El material descrito se desarrolló especÃficamente para su aplicación como sustrato de transición, o capa de reparación de la formación de la brida tensada vigas de hormigón reforzado con polÃmeros de flexión reforzado con fibras de carbono (PRFC). Diecinueve compuestos diferentes fueron producidos por el proceso de hibridación. Se varió la cantidad de fibras cortas y microfibras de acero. Para analizar el comportamiento de los ensayos de flexión en tres puntos materiales prismas se realizaron Jagged. La respuesta del material se analizó teniendo en cuenta parámetros de tenacidad a la flexión y (fractura). Materiales compuestos de alto rendimiento evidencia a través de un comportamiento pseudo- endurecimiento.
Palabras clave: compuestos cementÃceos; vigas de concreto; sustrato de transición.
Compósitos cimentÃcios de alto desempenho para aplicação como substrato de transição em vigas
RESUMO
Neste estudo apresenta-se o desenvolvimento e a análise do comportamiento de compuestos cementÃceos de elevado desempeño reforzados com fibras. O material descrito foi especificamente desarrollado para aplicación como um sustrato de transición, ou seja, camada de reparo que forma o banzo traccionado de vigas de concreto reforçadas à flexão com polÃmeros reforzados com fibras de carbono (PRFC). Dezenove diferentes compuestos foram produzidos pelo processo de hibridização. Variou-se o volume de fibras curtas e de microfibras de aço. Para analisar o comportamiento do material à flexão, ensaios em três pontos em prismas entalhados foram realizados. A resposta do material foi analisada considerando-se parâmetros de tenacidade (flexional e ao fraturamento). Ficou evidenciado o elevado desempeño dos compuestos através de comportamiento de pseudo-encruamento.
Palavras-chave: compuestos cementÃceos; vigas de concreto; sustrato de transición.
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References
Ferreira, L. E. T.; Bittencourt, T. N.; Souza, J. L. A. O.; Gettu, R. (2012), “R-Curve behavior in notched beam tests of rocksâ€, Engineering Fracture Mechanics, N. 32, pp 27-40.
Ferrari, V. J.; Hanai, J. B. (2012), “Flexural strengthening of reinforced concrete beams with carbon fibers reinforced polymer (CFRP) sheet bonded to a transition layer of high performance cement-based compositeâ€, Ibracon Structures and Materials Journal, Vol. 5, N. 5, pp 596-626.
Arquez, A. P. (2010), Dissertação mestrado, “Aplicação de laminado de polÃmero reforçado com fibras de carbono (PRFC) inserido em substrato de microconcreto com fibras de aço para reforço à flexão de vigas de concreto armadoâ€, Escola de Engenharia de São Carlos, Universidade de São Paulo.
Rilem TC 162-TDF (2002). Test and design methods for steel fibre reinforced concrete. Bending test, Materials and Structures, Vol. 35, pp 579-582.
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