Improvement on SIFCON Performance by Fiber Orientation and High-Volume Mineral Admixtures
Halit Yazici, Serdar Aydin, Hueseyin Yigiter, Giray Alptuna, Mert Yuecel Yardimci
article (Uluslararası, Hakemli) | Yazar(lar): Halit Yazici, Serdar Aydin, Hueseyin Yigiter, Giray Alptuna, Mert Yuecel Yardimci | Yıl: 2010 | Dergi/Kurum: JOURNAL OF MATERIALS IN CIVIL ENGINEERING | İndeks: WOS.SCI | DOI: 10.1061/(asce)mt.1943-5533.0000114 | Anahtar Kelimeler: Fiber-reinforced composites, Fly ash, Slag
The effects of steel fiber alignment and high-volume mineral admixture replacement [Class C fly ash (FA) and ground granulated blast furnace slag (GGBS)] on the mechanical properties of SIFCON (Slurry Infiltrated Fiber Concrete) have been investigated. Ordinary portland cement was replaced with 50% (by weight) FA or GGBS in SIFCON slurries, and two different steel fiber alignments (random and oriented in one direction) were used. Test results showed that FA and GGBS replacement positively affected mechanical properties (compressive and flexural strength and fracture energy) and fiber alignment is an important factor for superior performance. Binary combination of improved matrices (low water/binder ratio and mineral admixture replacement) and proper fiber orientation enhances mechanical performance, particularly flexural properties of SIFCON. Flexural strength and fracture energy of this composite are 138 MPa and 195,815 N/m, respectively. Scanning electron microscope investigations revealed tobermorite-like structures having different morphology such as foiled, fibrous, and honeycomb with low Ca/Si ratio after autoclaving. Mercury porosimeter tests showed the decreasing of total porosity and pore refinement with FA or GGBS.