OPTIMIZING MATERIAL REPLACEMENT STRATEGIES FOR ENHANCED STRENGTH PERFORMANCE OF SUSTAINABLE CONCRETE
DOI:
https://doi.org/10.67772/gq74r795Keywords:
sustainable concrete, material replacement, compressive strength, split tensile strength, recycled aggregatesAbstract
Sustainable concrete is an important pathway to decrease dependence on conventional cement and natural aggregates and to ensure adequate mechanical performance. This study compared various approaches for improving the strength performance of sustainable concrete by replacing materials. For the design, the experimental data consisted of five concrete conditions (conventional concrete, cement replacement, fine-aggregate replacement, coarse-aggregate replacement, and combined/all-material replacement), and a quantitative comparative design was used. The compressive strength and split tensile strength were obtained after 7, 14 and 28 days from three replicates for each curing age. The performance differences were analyzed using descriptive statistics, percentage improvement, one-way analysis of variance, post-hoc comparisons, and correlation analysis. The strength of all concrete groups was enhanced with the curing age. The combined material replacement gave the maximum compressive strength of 26.10 MPa at 28 days that shows a 24.26% improvement over the conventional concrete, and the split tensile strength of 4.46 MPa at 28 days that improves by 17.10% over the conventional concrete. There were significant differences in the compressive strength between replacement strategies at all curing ages, and significant differences in split tensile strength were also noted. The overall strength-performance index, which was normalized, also supported the condition of combined replacement as the strongest condition. These results show that it is possible to coordinate the replacement of several concrete constituents to improve the mechanical properties and allow more sustainable use of materials in the concrete industry.
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