<![CDATA[The utilization of natural fibers and recycled materials in cement-based composites has gained increasing attention as a sustainable approach to improving material performance while reducing environmental impacts. This study aimed to investigate the effects of bamboo micro-cellulose, cocopeat micro-cellulose, and recycled red brick aggregate on the characteristics of pozzolanic mortar. Mortar specimens were prepared using Portland Composite Cement (PCC), fly ash, lime, metakaolin, superplasticizer, bamboo micro-cellulose, cocopeat micro-cellulose, and recycled red brick aggregate. Compressive strength, flexural strength, and porosity tests were conducted at curing ages of 7 and 28 days. The results showed that the compressive strength increased with curing age, reaching a maximum value of 20.1 MPa at 28 days. The highest flexural strength (6.3 MPa) was achieved by the pozzolanic mortar containing 1.5% bamboo micro-cellulose without recycled aggregate, whereas the incorporation of recycled red brick aggregate tended to reduce flexural strength due to its higher water absorption and the lower quality of the Interfacial Transition Zone (ITZ). In addition, all mortar mixtures exhibited lower porosity at 28 days than at 7 days, indicating the formation of a denser cementitious matrix through hydration and pozzolanic reactions. Overall, the combination of pozzolanic materials, micro-cellulose, and recycled red brick aggregate demonstrates potential as an environmentally friendly alternative mortar through the utilization of biomass and construction wastes while maintaining satisfactory mechanical and physical properties.]]>
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