Title:
Mechanical Properties and Chloride Penetration Resistance Studies on Fiber Reinforced Semi-Light Weight Concrete
Author(s):
Singh
Publication:
Web Session
Volume:
ws_S24_Singh.pdf
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
3/23/2024
Abstract:
The research work done focused on the development of a cost-effective and environmentally friendly solution for Semi-Lightweight Fiber-Reinforced Concrete with improved tensile strength compared to traditional concrete. Discarded PET bottles collected from wasteyard of our university were utilized as fibers to enhance tensile strength, ensuring optimal fiber orientation and structural integrity. The study involved uniform incorporation of fibers with varying content (0% to 1%) while maintaining consistent aspect ratios. To achieve a semi-lightweight structure, artificial aggregates in pellet form were produced through a cold-bonded process using a Pelletizing disc. Optimal parameter, including a disc angle of 54 degrees and a speed of 20 rpm, were determined through experimentation. The pellet composition included calcite powder (60%), Class-F fly ash (20%), OPC53 Cement (20%), and stone chips (2%). Mechanical and durability characteristics were evaluated through various prepared mixes with varying fiber content. Fresh properties were determined using a slump cone test, while compressive strength tests were conducted at 7 and 28 days. Split tensile, flexural, and shear strength tests were performed at 28 days. Durability assessments included water absorption, Rapid Chloride Permeability Test (RCPT), Ultrasonic Pulse Velocity (UPV), and Sorptivity after 28 days. Electrical resistivity measurements were taken at intervals from 7 to 28 days. The research findings revealed a 43% reduction in slump value with the addition of fibers, and the density of the semi-lightweight fiber-reinforced concrete mix ranged from 1900 to 2100 kg/m3. Hardened properties exhibited marginal increases of 3-5% in split tensile and flexural strength, with a significant 48.6% increase in shear strength.