Title: Experimental study on the microstructure of nano TiO₂ concrete under carbonisation freeze-thaw conditions

Authors: Xiangming Han

Addresses: School of Engineering Management, Shanxi Vocational University of Engineering Science and Technology, Jinzhong, 030600, China

Abstract: The experimental study on the microstructure of nano TiO₂ concrete under carbonation and freeze-thaw conditions can provide in-depth understanding of the material's performance changes, assess its resistance to carbonation, analyse its durability, and seek optimisation solutions. Therefore, this study conducted experimental study on the microstructure of nano TiO₂ concrete under carbonisation freeze-thaw conditions. Relevant test piece were prepared using cement, nano TiO₂, coarse aggregates, and fine aggregates as experimental materials. Carbonation and freeze-thaw tests were conducted using a carbonation box and a freeze-thaw box. Test results indicate that there are significant pores, microcracks, and cracks in the specimens after carbonisation and freeze-thaw. There is a significant positive correlation between the number of carbonisation freeze-thaw cycles and the permeability and particle aggregation index of the specimen. The maximum porosity is 1.19%, the optimal content of nano TiO₂ is 4.49%, indicating that nano TiO₂ can improve the distribution of concrete pore structure.

Keywords: carbonisation freeze-thaw; nano TiO₂ concrete; microstructure; coarse aggregates; fine aggregates; porosity; permeability; particle clustering index.

DOI: 10.1504/IJMMP.2024.137980

International Journal of Microstructure and Materials Properties, 2024 Vol.17 No.2/3, pp.233 - 248

Received: 18 Jul 2023
Accepted: 08 Nov 2023
Published online: 15 Apr 2024 *

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