Research Article
Mechanical Performance and Reliability Assessment of Nanosilica-Modified High-Strength Concrete Beams
Ooye Steeve Tobi,
John Wasiu,
Ibrahim Abdulrazaq Olayinka*
,
Osegbowa Douglas Enoguan
Issue:
Volume 15, Issue 3, September 2026
Pages:
80-90
Received:
15 June 2026
Accepted:
26 June 2026
Published:
17 July 2026
DOI:
10.11648/j.am.20261503.11
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Views:
Abstract: The growing demand for high-performance and durable construction materials has led to increasing interest in nanotechnology applications in concrete. This study investigates the mechanical properties, microstructural behavior, and structural reliability of high-strength concrete beams (HSCBs) incorporating nanosilica as a partial cement replacement. Experimental investigations were conducted on concrete mixes containing 0%, 3%, 5%, and 7% nanosilica by weight of cement. Material characterization included sieve analysis, specific gravity, water absorption, and density tests for aggregates, while nanosilica was evaluated using SEM/EDX and FTIR to examine its morphology and chemical interactions. Compressive strength tests were performed at 7, 14, 21, and 35 days, and flexural strength tests were conducted on reinforced concrete beams. Results showed significant improvements in both compressive and flexural strengths with nanosilica incorporation, with the optimum performance observed at 5% replacement, achieving up to 18% higher compressive strength than the control mix. Microstructural analysis confirmed enhanced formation of calcium silicate hydrate (C–S–H) gel and pore refinement due to nanosilica’s pozzolanic reactivity and filler effect. Furthermore, structural performance was evaluated using both deterministic design methods and reliability-based analysis (FORM), demonstrating that nanosilica-modified beams achieved higher reliability indices and reduced probabilities of failure. The study concludes that controlled incorporation of nanosilica significantly enhances the strength, durability potential, and structural safety of high-strength concrete beams.
Abstract: The growing demand for high-performance and durable construction materials has led to increasing interest in nanotechnology applications in concrete. This study investigates the mechanical properties, microstructural behavior, and structural reliability of high-strength concrete beams (HSCBs) incorporating nanosilica as a partial cement replacement...
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