Title: Life prediction of steel fibre reinforced concrete structures under chloride corrosion

Authors: Qunxing Bai

Addresses: College of Urban Construction, Hainan Vocational University of Science and Technology, Haikou, 571126, China

Abstract: The prediction error of the lifespan of concrete structures is relatively large, so a method for predicting the lifespan of steel fibre reinforced concrete structures under chloride salt corrosion is proposed. The mechanism of chloride ion intrusion into steel fibre reinforced concrete structures is analysed. Steel fibre reinforced concrete structural specimens is prepared, and a life prediction function for steel fibre reinforced concrete structures is constructed by integrating initial corrosion time, mass loss rate, relative dynamic modulus of elasticity, and corrosion rate. The experimental results show that under low NaCl concentration conditions, the service life of concrete structures can reach 35 years, quality loss rate of steel fibre reinforced concrete structure under chloride corrosion condition 1 > chloride corrosion condition 2 > chloride corrosion condition 3. The relative dynamic elastic modulus decreases with the increase of NaCl concentration and number of cycles, reaching a minimum of 40 GPa.

Keywords: chloride corrosion; reinforced concrete structure; diffusion theory; life prediction; steel fibre.

DOI: 10.1504/IJMMP.2024.142798

International Journal of Microstructure and Materials Properties, 2024 Vol.17 No.4, pp.307 - 321

Received: 01 Aug 2023
Accepted: 07 Feb 2024
Published online: 22 Nov 2024 *

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