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Submitted
26 May 2025
Accepted
10 June 2025
Published
23 June 2025
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Abstract

Concrete is a key material in Indonesia’s infrastructure development, with growing interest in sustainable alternatives to natural aggregates. This study evaluates the mechanical performance of high-strength concrete incorporating bauxite sand as a partial replacement for fine aggregate. The control mix (BMT-0) was designed with a water–cement ratio of 0.3 and a cement content of 550 kg/m³, using natural sand and crushed coarse aggregate, without any chemical admixtures. Four additional mixes (BMT-1 to BMT-4) included bauxite sand at replacement levels of 2.5%, 5%, 7.5%, and 10% by weight of fine aggregate. A total of 30 specimens were tested to assess compressive strength, splitting tensile strength, and modulus of elasticity. All mixes exceeded the minimum compressive strength requirement for high-strength concrete (41.4 MPa). The mix with 5% bauxite sand replacement (BMT-2) demonstrated the highest compressive strength (49.33 MPa) and tensile strength (3.46 MPa), while the 7.5% mix (BMT-3) achieved the highest modulus of elasticity (38,877.32 MPa). The results suggest that partial replacement of fine aggregate with 5% bauxite sand enhances concrete quality without compromising mechanical performance.

Keywords

High-strength concrete Bauxite sand Compressive strength Tensile strength Modulus of elasticity

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Copyright (c) 2025 Putri Yasmin Azzahra, Prof. Ir. Mochamad Teguh, MSCE., Ph.D.

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Author Biography

Mochamad Teguh, Department of Civil Engineering, Faculty of Civil Engineering and Planning, Islamic University of Indonesia, Indonesia

Scopus ID : 16032101000

https://www.scopus.com/authid/detail.uri?authorId=16032101000

 

Sinta ID : 5974348

http://sinta.ristekbrin.go.id/authors/detail?id=5974348&view=overview

How to Cite
Azzahra, P. Y., & Teguh, M. (2025). Mechanical properties of High-Strength concrete with bauxite sand as partial fine aggregate replacement. Teknisia, 30(1), 13–22. https://doi.org/10.20885/teknisia.vol30.iss1.art2
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