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<p>To investigate sodium silicate slurry curing mechanisms and sandstone interactions during crack restoration, an in-situ fiber Bragg grating (FBG) sensor system was established to monitor temperature, humidity, and micro-strain during curing. The surface morphology and material composition of sodium silicate slurry at different temperatures were also investigated. The results indicated that CH<sub>3</sub>COOH from CH<sub>3</sub>COOCH<sub>2</sub>CH<sub>2</sub>OOCCH<sub>3</sub> hydrolysis reacted with Na<sub>2</sub>O<sub>•</sub>nSiO<sub>2</sub>, generating heat (max heating rate: 0.42 °C/h at 35 °C), reducing humidity (max dehumidification rate: 0.79% RH/h at 35 °C), and inducing shrinkage strain (peak at −115.23 με at 35 °C). The grout achieved optimal curing, forming a densified structure with small CH<sub>3</sub>COONa migration, inducing only 31.62 με micro-strain on the sandstone surface at 35 °C. Smaller fissures reduced sandstone strain and damage, confirming sodium silicate is more suitable for small fissures at 35 °C. This study advances heritage conservation and fiber optic sensing via intelligent relic preservation technologies.</p>

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In situ continuous decoding of temperature humidity and micro strain during sandstone fracture hole restoration

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年6月6日

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  • Ruoxu Zhao,
  • Yang Liu,
  • Quanhua Xie,
  • Yuanyuan He,
  • Nianbing Zhong

摘要

To investigate sodium silicate slurry curing mechanisms and sandstone interactions during crack restoration, an in-situ fiber Bragg grating (FBG) sensor system was established to monitor temperature, humidity, and micro-strain during curing. The surface morphology and material composition of sodium silicate slurry at different temperatures were also investigated. The results indicated that CH3COOH from CH3COOCH2CH2OOCCH3 hydrolysis reacted with Na2O•nSiO2, generating heat (max heating rate: 0.42 °C/h at 35 °C), reducing humidity (max dehumidification rate: 0.79% RH/h at 35 °C), and inducing shrinkage strain (peak at −115.23 με at 35 °C). The grout achieved optimal curing, forming a densified structure with small CH3COONa migration, inducing only 31.62 με micro-strain on the sandstone surface at 35 °C. Smaller fissures reduced sandstone strain and damage, confirming sodium silicate is more suitable for small fissures at 35 °C. This study advances heritage conservation and fiber optic sensing via intelligent relic preservation technologies.