BEHAVIOUR OF MECHANICAL PROPERTIES OF ULTRA-HIGH PERFORMANCE CONCRETE WITH STEEL FIBRES AND MINERAL ADMIXTURES

Manoj V, Shiva Kumar K S, Santhosh K

Abstract: The present experimental work is taken to study the strength properties of UHP-FRC. The locally available materials are used for making UHPC with steel fibers from manufacturer and low water binder ratio is adopted with hyper-plasticizer as admixture. The effect of presence of coarse aggregates on strength of UHPFRC is evaluated in comparison with UHPFRC without coarse aggregates. The present work also studies the effect of using mineral admixtures namely GGBS – Ground Granulated Blast Furnace Slag and Silica fumes replacing the cement by weight. The fine aggregate content of the mix is replaced with Manufactured Sand (M-Sand) and Quartz sand. The steel fibers are used in both the mixes that are mix with without coarse aggregates. The strength characteristics of the mixes are studied, adopting particle packing density approach. The characteristic of the materials determined using the standard procedure as per relevant codes of practice. The design mix is arrived by taking a reference mix from the literature, revalidating its properties and modifying the mix suitably. The workability of mixes is evaluated as per EFNARC 2005. The compressive strength, flexural strength and spilt tensile strength of UHFRC with and without coarse aggregates are assessed.

Keywords: Steel Fibers, Rheology of UHPC, High Strength, Mineral Admixtures

DOI: https://doi.org/10.15623/ijret.2016.0509046