Experimental study on self-healing performance of siliceous self-healing materials

FANG Zhou; HOU Weihong

doi:10.3969/j.issn.1001-702X.2025.10.017

Abstract：Based on multi-ionic complexing agents and hydrated calcium silicate varieties,a siliceous self-healing material was prepared by combining active calcareous and siliceous materials.The study investigated the effects of the multi-ionic complexing a-gent,hydrated calcium silicate variety,and active nano-silica content in the formulation on the self-repair performance of the siliceous self-healing material.The results showed that the siliceous self-healing material could significantly improve the self-repair perfor-mance of concrete.The self-repair capacity ratio of concrete subjected to water pressure damage could reach up to 266.7％,that sub-jected to load damage could reach up to 133.1％,that subjected to freeze-thaw damage could reach up to 128.4％,and that subjected to crack damage could reach up to 158.5％.Considering both compressive strength and self-repair performance,the optimal formula-tion for the siliceous self-healing material is:5％sodium methylsilicate,10％calcium hydroxide,25％calcium-magnesium composite expansion thermal material,20％active nano-silica,20％multi-ionic complexing agent,and 20％hydrated calcium silicate seeds.The siliceous self-healing material prepared with 1％of the optimal formulation can repair cracks within 0.40 mm in concrete.