Durability of sisal fiber-reinforced mortar with glass powder as cement substitute in aggressive environment
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Date
2025
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Abstract
Mortar plays a crucial role in construction, serving as a binder in masonry, plastering,
and repairs. However, durability remains a key challenge, especially under harsh
environmental conditions. This study investigates the durability and mechanical
performance of sisal fiber reinforced-mortar (FR-M) incorporating waste glass powder
(GP) as a partial cement replacement. Mortar mixes with 0–20% GP and 1% sisal fiber
were prepared, and their properties were evaluated under exposure to magnesium
sulfate (MgSO₄). Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD)
analyses revealed that GP enhanced the formation of C–S–H gel, reduced porosity,
and promoted a denser matrix, which correlated with improved strength and
sulfate resistance. The results demonstrated that the balanced mix, which is 7.5%
GP with 1% fiber, showed the highest compressive strength (18 MPa) and flexural
strength (6.7 MPa) after 90 days of curing. Furthermore, this mix exhibited superior
sulfate resistance, with only 13.8% and 14.8% loss in compressive and flexural
strengths, respectively, and minimal expansion (0.096 mm). In contrast, higher GP
levels (15% and 22.5%) led to reduced strength and durability. This study highlights
the combined effect of GP and sisal fiber in improving both the mechanical
properties and sulfate resistance of mortar, offering a sustainable solution for durable
construction materials