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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Creep Behavior of High-Strength Concrete with Polypropylene Fibers at Elevated Temperatures
Author(s): Bo Wu, Eddie Siu-Shu Lam, Qun Liu, Wilson Yuk-ming Chung, and Ivy Fung-yuen Ho
Publication: Materials Journal
Appears on pages(s): 176-184
Keywords: creep; high-performance concrete; polypropylene fibers; strain; temperature.
Abstract:Experimental studies have been conducted to examine the creep behavior of high-strength concrete (HSC) with polypropylene (PP) fibers of 2 kg/m3 (0.125 lb/ft3) when exposed to elevated temperature. Various types of heating and loading schemes are considered, including transient temperature and stepwise loading paths. Tests are carried out at temperatures up to 700°C (1292°F) and a stress ratio up to 0.6. HSC with PP fibers performs better than normalstrength concrete (NSC) at temperatures below 500°C (932°F) and shows an obvious increase in creep behavior at 700°C (1292°F). At the same stress ratio and duration of 120 minutes, the creep strain developed at 700°C (1292°F) was approximately 10 times more than that developed at 500°C (932°F). There was no abrupt change in creep behavior at or approximately 2200°C (428°F) when the PP fibers evaporated. It is likely that the markedly different response at 7000°C (1292°F) was related to the change in the microstructure of HSC at high temperatures. Increasing the stress ratio at constant temperature will lead to an abrupt increase in creep strain rate. HSC with PP fibers showed a large transient creep strain, and this phenomenon becomes obvious at higher temperatures. Finally, fitting equations are proposed to represent the creep behavior of HSC with PP fibers.
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