Influence of fire on temperature gradient and physical-mechanical properties of macro-synthetic fiber reinforced concrete for tunnel linings

Autor(es)

Serafini, Ramoel ^{[1, 2]} ; Dantas, Sergio R. A. ^[1] ; Salvador, Renan P. ^{[3, 1]} ; Agra, Ronney R. ^{[1, 2]} ; Rambo, Dimas A. S. ^[3] ; Berto, Antonio F. ^[2] ; de Figueiredo, Antonio D. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Polytech Sch, Dept Civil Construct Engn, Ave Prof Almeida Prado, Travessa 2, 83, BR-05424970 Sao Paulo - Brazil

^[2] Inst Technol Res, Ave Prof Almeida Prado 532, BR-05508901 Sao Paulo - Brazil

^[3] Univ Sao Judas Tadeu, Dept Civil Engn, Rua Taquari 546, BR-03166000 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CONSTRUCTION AND BUILDING MATERIALS; v. 214, p. 254-268, JUL 30 2019.
• Citações Web of Science: 1

Resumo

This study aims to evaluate the effect of fire on the physical, mechanical, and microstructural properties of macro-synthetic fiber reinforced concrete. Results demonstrated that internal heating rate is constant through time and is a function of the distance from the fire. Temperature gradient values are nonlinear, reduce at greater distances from the heated surface and with the duration of the fire. Microstructural analysis shows the severe dehydration of hydrated products, which negatively influences the mechanical properties of the composite. Above 205 degrees C the formation of nesosilicates is verified. Residual flexural strength values reduce by over 85% after the fire exposure due to deterioration of the reinforcing mechanism. Compressive strength and elastic modulus drastically reduce with temperature increase. The present study contributes to the absent literature on the post-fire mechanical behavior of MSFRC, suggests an alternative approach to the post-fire evaluation of tunnel structures, and aids in the definition of post-fire safety parameters. (C) 2019 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 17/00125-9 - Caracterização de propriedades químicas, desempenho mecânico e durabilidade de concreto projetado
• Beneficiário: Renan Pícolo Salvador
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 15/25457-9 - Efeito da temperatura na resistência in-situ e residual de segmentos de túneis reforçados com fibras por meio do ensaio Barcelona simplificado
• Beneficiário: Dimas Alan Strauss Rambo
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado