Performance Evaluation of Fibre-Reinforced Cementitious Grout for Structural Rehabilitation

Abstract

In order to improve the mechanical performance of cementitious grout matrices in relation to structural rehabilitation and repair projects, this
study investigates cementitious grout matrices reinforced with polyolefin fiber (Mape fiber BG55). Three distinct phases comprised the
experiment program: (1) optimization of grout composition by experimenting with non-shrink admixtures; (2) testing of Polyolefin fiber
configurations with different aspect ratios at a constant fiber dosage; and (3) combined evaluation of optimized grout-fibre systems.
Compressive strength and flexural strength were evaluated during different curing times (3, 7, and 28 days). Findings showed that better
performance at 28 days with Quarter length fibres (aspect ratio 17.19) with optimized grout (50.15 N/mm2 compressive strength (11.72%
increase) and 5.82 N/mm2
flexural strength (34.72% increase)) was attained relative to Control Specimen. These findings show that there is a
relationship between optimised grout composition and optimal fibre geometry. These improvements can be attributed to enhanced fibre–matrix
bonding, effective crack-arresting mechanisms, and a refined microstructural framework. The findings provide empirical evidence that a wellbalanced combination of grout composition and fibre geometry leads to the development of high-performance cementitious materials, making
them particularly suitable for durable structural repair and rehabilitation applications.