The COMPRESSIVE STRENGTH OF ULTRA HIGHPERFORMANCE FIBER-REINFORCED CONCRETE USING NANO-SILICA
Abstract
Ultra High Performance Fiber Reinforced Concrete (UHPFRC) was developed to meet the tripartite requirement of strength, durability and ductility. To achieve this, Nano-silica was used to replace cement partially and also glass fiber was incorporated at various inclusion levels. The Particle Packing Method of mix design was adopted for the design of UHPFRC in order to reduce void volume. The popular use of steel fibers in Reinforce concrete structure situated hostile environment causes corrosion. However, other corrosion resistant fibers such as glass fibers was adopted. To evaluate workability, slump test was conducted on fresh concrete while compressive and tensile strength tests were carried out on hardened concrete specimens at water-cement ratios of 0.2 and 0.22 and the inclusion of glass fibers at varying percentages ( 0.5, 1.0, 1.5 %). was investigated. The results showed increase in compressive and split tensile strength of the concrete as the incorporation of Nanosilica (5%, 10%, and 15%) and glass fiber (0.5%, 1.0%, and 1.5%) increases. Maximum compressive strength of 152.3 MPa was measured at 15% replacement of cement with Nanosilica and 1.5% inclusion of glass fiber. Results showed that nanosilica, a superior supplementary cementitious material can be used to produce UHPFRC.
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