Experimental Study on Creep Behaviour of Glass Fibre-Reinforced Concrete
摘要
Creep is a critical phenomenon in tunnel construction as excessive time-dependent deformation can compromise the integrity of concrete lining. In order to resist such deformations and improve the tensile strength of concrete, fibres are added to it. In this study, an attempt has been made to evaluate the creep characteristics of glass fibre-reinforced concrete (GFRC). Initially, a concrete mix of M25 grade was prepared as per IS code guidelines. The concrete specimens were prepared with an addition of 0, 0.5, 1, 1.5, and 2% of fibre. Mechanical tests such as Uniaxial Compressive Strength (UCS) Test and Split-tensile test were conducted on the specimens to evaluate the optimum percentage of fibre. Experimental results indicated that addition of 0.5% and 1% glass fibre enhanced the compressive and tensile strength of the concrete specimen, whereas higher fibre content (1.5% and 2.0%) reduced its strength compared to the conventional concrete. Moreover, in order to study the creep behaviour of Glass Fibre Reinforced Concrete (GFRC), the mix design associated with maximum strength gain (1% glass fibre) was chosen to conduct the cantilever-type creep test. The investigation focused on the comparison of creep deformation characteristics between ordinary cement concrete and glass fibre reinforced concrete (GFRC) with 1% fibre content. It was found that the glass fibre effectively reduces the creep deformations in concrete.