Author(s): T. Chandra Sekhara Reddy, A. Ravitheja, and C. Sashidhar

Abstract

The study aimed at examining the capacity of diverse add-ons in improving the self-healing ability of fiber-reinforced concrete through low water-cement ratios (w/c) and exposure to wide cracks.

The self-healing capacities of crystalline admixture (CA) and silica fume (SF) were assessed by mechanical and durability performance. The effect of various exposure periods (7 to 42 days) in four different exposure conditions—namely, water immersion, wetting-and-drying cycles, water contact, and air exposure (AE)—on self-healing was evaluated by application of through-crack compressive stress.

Compressive strength and durability analysis showed that CA with 10% SF was excellent in all four environments. Fourier transform infrared spectroscopy and scanning electron microscope results showed significant bond formation contributing to the self-healing property of the CAs. Therefore, concrete mixture with CA and 10% SF is recommended for use to increase the self-healing of concrete.

Keywords: calcium carbonate (CaCO3); crystalline admixtures; durability properties; Fourier-transform infrared spectroscopy (FTIR); mechanical properties; pH; scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS); self-healing; silica fu

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