Study of the Effect of Hemp Fibers and Brick Waste Powder on the Mechanical Characteristics of Mortar: Experimental and Statistical Analysis

• Published in: Journal of natural fibers 2025-12, Vol.22 (1)
• Main Authors: Chetbani, Yazid, Boumaaza, Messaouda, Zaitri, Rebih, Belaadi, Ahmed, Mahammed, Aissa Ben, Laouissi, Aissa, Alshaikh, Ibrahim M.H., Ghernaout, Djamel
• Format: Article
• Language: English
• Subjects: brick waste powder; flow time; hemp fibers; mechanical strength; Mortar; response surface methodology
• ISSN: 1544-0478; 1544-046X
• DOI: 10.1080/15440478.2024.2438900

This study aims to optimize the mechanical and rheological properties of cementitious mortar by incorporating hemp fibers (HF) and brick waste powder (BWP), with the goal of developing a more sustainable and eco-friendly construction material. Using response surface methodology (RSM), different proportions of HF (0, 0.25, 0.5%) and BWP (0, 10, 20%) were tested to optimize flowability, compressive and flexural strength. The experimental results indicate that the optimal composition, 0.25% HF and 10% BWP, significantly enhances mechanical performance while maintaining workability. Furthermore, the outcomes show that adding 10% BWP and around 0.5% HF considerably reduced the rheological characteristics, as seen by a longer flow time in comparison to other combinations. The ideal cement substitution rates, as determined by RSM, were 11.46% of BWP and 0.31% of HF. The study demonstrates the feasibility of using natural fibers and recycled materials in eco-friendly mortars, offering a sustainable alternative for construction. The predictive accuracy of the RSM model was validated through experimental verification, with results deviating by less than 5%. These findings contribute to the advancement of green building materials and sustainable construction practices.