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Updated: Jan 18, 2026
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Preparation of Aligned Steel Fiber Reinforced Cementitious Composite and Its Flexural Behavior
Published on: June 27, 2018
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Research on Optimizing the Steel Fiber/CSH Interface Performance Based on Ca/Si Ratio
Yalin Luan1,2, Yongmei Wu1, Runan Wang2
1The Seventh Engineering Co., Ltd. of CCCC First Highway Engineering Co., Ltd., Zhengzhou 451452, China.
Materials (Basel, Switzerland)
|September 13, 2025
Summary
Optimizing the calcium-to-silicon (Ca/Si) ratio in concrete enhances interfacial bonding and reduces permeability. This improves the marine durability of steel fiber reinforced concrete by resisting seawater and ion transport.
Area of Science:
- Materials Science
- Civil Engineering
- Corrosion Science
Background:
- Marine environments pose significant challenges to steel fiber reinforced concrete (SFRC) due to stress corrosion coupling.
- Mechanical loading induces cracks, increasing susceptibility to seawater penetration and interfacial degradation, compromising structural integrity.
Purpose of the Study:
- To investigate the impact of varying calcium-to-silicon (Ca/Si) ratios on the interfacial properties of γ-FeOOH/CSH systems.
- To understand how Ca/Si ratios influence bonding strength and the transport of water and ions within concrete nanopores.
Main Methods:
- Utilized molecular dynamics simulations to model the γ-FeOOH/CSH system.
- Analyzed the effects of different Ca/Si ratios on ionic bonding, interfacial adhesion, and molecular/ionic transport.
Main Results:
- Higher Ca/Si ratios were found to strengthen ionic bonding between CSH and γ-FeOOH, enhancing interfacial adhesion.
- Increased Ca/Si ratios significantly inhibited the transport of water molecules and aggressive ions (Na+, Cl-, SO42-) within nanopores.
- Pronounced filtration effects for chloride (Cl-) and sulfate (SO42-) ions were observed at a Ca/Si ratio of 2.0.
Conclusions:
- Optimizing the Ca/Si ratio in concrete offers a dual benefit of improved interfacial strength and reduced permeability.
- This strategy presents an effective approach to enhance the marine erosion resistance of steel fiber reinforced concrete structures.
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