PSI - Issue 70

Available online at www.sciencedirect.com

ScienceDirect

Procedia Structural Integrity 70 (2025) 327–334

Structural Integrity and Interactions of Materials in Civil Engineering Structures (SIIMCES-2025) Effect of Nano-Al 2 O 3 , Nano-SiO 2 , and Nano-CaCO 3 on the

Properties of Cementitious Composites Suresh Kumar Verma a , Md Daniyal b, *, Dulal Goldar a a Department of Civil Engineering Lingaya’s Vidyapeeth, Faridabad, India-121002 b Department of Civil Engineering, Sandip University, Madhubani-847235, India

Abstract This study investigates the effects of nano-alumina (Al 2 O 3 ), nano-silica (SiO 2 ), and nano-calcium carbonate (CaCO 3 ) as partial substitutes for Ordinary Portland Cement (OPC) at 1%, 3%, and 5% replacement levels by weight. Due to their ultra-fine particle size and high reactivity, these nanoparticles influence cement hydration kinetics, refine microstructure, and improve the durability of cementitious composites. Nano-silica significantly enhances long-term compressive strength through its pozzolanic activity, while nano-alumina boosts early-age strength by accelerating hydration. Nano-CaCO 3 contributes mainly through a filler effect, promoting particle packing and providing nucleation sites for hydration products. The results indicate that 3% replacement level yields optimal performance across strength and durability parameters. Higher dosages beyond 3% lead to a reduction in workability and marginal improvement or even decline in mechanical properties, likely due to nanoparticle agglomeration and excessive water demand. This research underscores the potential of nanomaterials in improving sustainable and high performance cementitious systems. © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of International Conference on Structural Integrity Organizers

Keywords: Nano-Alumina; Nano-Silica; Nano-Calcium Carbonate; Cementitious Composites;

* Corresponding author. Tel.: +91-7417246066. E-mail address: daniyalzhcet@gmail.com

2452-3216 © 2025 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under the responsibility of International Conference on Structural Integrity Organizers 10.1016/j.prostr.2025.07.060