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57. Fire resistance of hybrid fiber reinforced high strength concrete

Title: 57. Fire resistance of hybrid fiber reinforced high strength concrete
Author(s): T. Horiguchi, T. Sugawara, N. Saeki
Paper category : conference
Book title: 6th International RILEM Symposium on Fibre Reinforced Concretes
Editor(s): M. di Prisco, R. Felicetti and G.A. Plizzari
Print-ISBN: 2-912143-51-9
e-ISBN: 2912143748
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 669 - 678
Total Pages: 10
Nb references: 18
Language: English

Abstract: High-strength concrete shows particular characteristic behavior at elevated temperatures, such as explosive spalling, that is rarely observed in normal-strength concrete. This behavior has been attributed to the very dense concrete matrix usually associated with high-strength concrete. Recently the addition of polypropylene fibers into high-strength concrete was reported to be very effective against the explosive spalling. As heating increases, the fibers in the cement matrix start to melt at about 170 °C and increase the total pore area. This melting effect mitigates the explosive spalling as it provides pore space in which moisture vapor can accumulate at lower vapor pressures. However, it is hopeless to maintain the fracture toughness when the fibers melt. Steel fiber reinforcement can help to maintain the fracture toughness after heated. In this paper, hybrid fiber reinforcement with the combination of polypropylene and steel fibers is proposed for improving the strength as well as the fracture characteristics after heating. Tests results of hybrid fiber reinforced concrete showed significant improvement on the residual strength and residual fracture energy after high temperature (200 and 400 °C).

Online publication: 2004-08-30
Publication type : full_text
Public price (Euros): 0.00

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