Title: Experimental study on the effect of composite nano-SiO₂ on the durability of concrete

Authors: Guangjuan Gu; Hongling Song

Addresses: Key Laboratory of Building Structure of Anhui Higher Education Institutes (Anhui Xinhua University), Hefei, 230088, Anhui, China; Urban Construction College, Anhui Xinhua University, Hefei, 230088, Anhui, China ' Key Laboratory of Building Structure of Anhui Higher Education Institutes (Anhui Xinhua University), Hefei, 230088, Anhui, China; Urban Construction College, Anhui Xinhua University, Hefei, 230088, Anhui, China

Abstract: To verify the effect of composite nano-SiO₂ on the durability of concrete, this article first analyses the composition of experimental materials and instruments and conducts the preparation of nano-SiO₂ concrete. By conducting experiments on different dosages of nano-SiO₂ and concrete, the effects on concrete strength, impermeability, and carbonation resistance were analysed. The experiment adopts an orthogonal design method, with the dosage of nano-SiO₂, water-cement ratio, and curing time as the main variables, and selects concrete samples with similar physical properties for testing. Through experiments, it is known that adding nano-SiO₂ in concrete can effectively improve the durability of concrete, reaching the highest value at a dosage of 0.1% or 0.15%, improving compressive strength. Concrete with a fly ash content of 30% has the highest working performance. This study provides a strong reference basis for further optimising the concrete mix ratio and improving durability performance.

Keywords: nano-SiO₂; concrete; durability performance; carbonisation resistance; orthogonal design.

DOI: 10.1504/IJMMP.2024.137978

International Journal of Microstructure and Materials Properties, 2024 Vol.17 No.2/3, pp.191 - 205

Received: 17 Jul 2023
Accepted: 08 Nov 2023
Published online: 15 Apr 2024 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article