Paper Key : IRJ************758
Author: Sheeraz Ahmad Phulpoto,Muhammad Jaffar Memon,Manthar Ali Keerio,Dildar Ali Mangnejo
Date Published: 13 Oct 2023
Abstract
Concrete is the most extensively used building material around the globe. After water, concrete is the second most used material in terms of its usage and production due to its unique characteristics, like its affordability, availability, and adaptability in relation to its Strength and durability. Cement, a binder used in concrete, is the chief responsible for carbon emissions. The cement industry is responsible for around 8-10% of carbon emissions globally. Supplementary cementing materials (SCMs) have been used over the years not only to improve the properties and efficacy of concrete but also to help reduce the carbon emissions due to cement production. These materials are industrial by-products or waste materials with cementitious properties that can partially replace or supplement Portland cement. SCMS includes fly ash, pulverized granulated blast furnace slag, silica fume, rice husk ash, and metakaolin. Etc. This research study involves Silica Fume as SCM to supplement the cement and Nylon Fiber as a reinforcing material. The research conducted on fresh properties (workability), hardening properties (compressive Strength), with and without incorporation of Silica Fume and Nylon Fiber and their effect on the properties of concrete is investigated at 28days of curing ages. The cement content is replaced with 5%, 10%, and 15% with SF by weight. Nylon Fiber, having 20cm length and 0.5mm diameter with dosages of 0.5%, 0.75%, and 1% by volume of concrete, is used as a reinforcing material. Based on the results. It was observed that the workability of concrete decreases as the percentage replacement of cement with silica fume increases. Compressive Strength increases when cement is replaced up to 10% with silica fume. Strength starts to decrease with further replacement. Therefore, maximum compressive strength is achieved at 10% cement replacement with Silica Fume i.e. 29.5 MPA and 2.7 MPA, which is 11.95% and 12.5% more than the control mix. The inclusion of Nylon Fiber also has a negative effect on the workability of concrete as the dosage of Nylon Fiber increases. Compressive Strength has improved significantly with the increase in the dosage of Nylon Fiber. Maximum compressive and splitting tensile Strength was observed at 1% dosage of Nylon Fiber, i.e., 33.4 MPA and 3.28 MPA, which is 26.75% and 36.66% more than the control mix. When each Silica fume proportion was reinforced with each Nylon Fiber dosage, the workability of the concrete was diminished with their combined effect. However, an increase in compressive Strength was observed at 5% cement replacement with Silica Fume reinforced with 0.5% Nylon fiber dosage. Further increase in Silica Fume and Nylon Fiber % decreases the Strength. Maximum compressive strength observed at 5% replacement of cement and 0.5% inclusion of Nylon fiber i,e. 34.6 MPa and 2.75 MPa, which is 31.3% and 14.6% more than the control mix. The research concludes that 5% cement replacement with Silica Fume and 0.5% inclusion of Nylon fiber by volume fraction can certainly enhance the concrete properties.Keywords: Nylon Fiber (NF), Silica Fume (SF), Compressive strength, Workability.