Residual compressive strength of fire exposed fibre reinforced concrete

Author(s): G.L. Balázs, E. Lublóy
Paper category: Conference
Book title: 8th RILEM International Symposium on Fiber Reinforced Concrete: challenges and opportunities (BEFIB 2012)
Editor(s): Joaquim A.O. Barros
Print ISBN: 978-2-35158-132-2
e-ISBN: 978-2-35158-133-9
Publisher: RILEM Publications SARL
Pages: 279 - 288
Total Pages: 9
Language: English

Abstract: 
n case of tunnel fires, in addition to the reduction of load bearing capacity, spalling of concrete cover makes additional difficulties. The danger of spalling of concrete cover increases by using high strength concrete. Spalling of concrete cover can be decreased by the application of fibers. Purpose of our experimental study was to analyze the effectiveness of polypropylene and steel fibres in surface cracking and in reduction of compressive strength owing to high temperatures. Compressive strength tests have been carried out on cubes of 150 mm sides. The experimental strength range was 60 to 70 N/mm2. Concrete composition and temperature (20°C, 50°C, 150°C, 200°C, 300°C, 400°C, 500°C, 600°C, 800°C) were the test variables. Specimens were tested at room temperature after the heating process and a 2-hour exposure to temperature. Test variables were: temperature and fibre type. Our test results suggest, if steel fibers are applied thin and short fibers contributed to the residual compressive strength after high temperatures. In case of steel fibre reinforced concrete with fiber 4 (Ø 0,75 mm, ℓ=35 mm) and fiber 5 (Ø 0.3 mm, ℓ=12,5 mm) surface cracks were practically not observed up to 800°C.

Online publication: 2013
Publication Type: full_text
Public price (Euros): 0.00