Effect of Deoxyribonucleic Acid on the Chloride Diffusion Behavior of Cement Mortar
Publication: Journal of Materials in Civil Engineering
Volume 36, Issue 8
Abstract
Corrosion of reinforcement bar caused by chloride ions diffusion is a crucial durability problem for concrete structures. Deoxyribonucleic acid (DNA) is a new type of corrosion inhibitor. Previous research has concentrated primarily on the influence of DNA on the corrosion of reinforcement bar caused by chloride salts in simulated concrete pore solution and cement-based materials, with scant attention to the chloride diffusion behavior of cement-based materials with DNA. In this work, the chloride diffusion behavior of cement-based materials with DNA was studied using chloride binding isotherm, chloride rapid migration (RCM), and natural diffusion tests. The composition, content, and morphology of the hydration products and pore structure were monitored using X-ray diffraction (XRD), thermogravimetry (TG), scanning electron microscopy (SEM), and mercury intrusion porosimetry (MIP) tests. The results show that DNA can improve the chloride-binding capacity and enhance the chloride diffusion resistance in cement-based materials. The lowest chloride migration coefficient and chloride diffusion coefficient were found in cement mortar with 4% by weight DNA, which were 45.58% and 42.36% lower than those of the reference group, respectively. DNA can stimulate the cement hydration reaction to produce more C-S-H gels and can increase the ratio of C-S-H. This is conducive to physical chloride adsorption. DNA can be combined with calcium ions to form insoluble aggregates that can fill the pore structure of mortar. Mortar with 4% by weight DNA maintained the lowest porosity, which effectively enhanced the chloride diffusion resistance.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This work is supported by the National Natural Science Foundation of China (No. 52078183) and Water Science and Technology project of Zhejiang Province (No. RB2217).
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Published In
Journal of Materials in Civil Engineering
Volume 36 • Issue 8 • August 2024
Copyright
© 2024 American Society of Civil Engineers.
History
Received: Sep 4, 2023
Accepted: Jan 12, 2024
Published online: May 16, 2024
Published in print: Aug 1, 2024
Discussion open until: Oct 16, 2024
ASCE Technical Topics:
- Building materials
- Cement
- Chemical compounds
- Chemicals
- Chemistry
- Chloride
- Concrete
- Diffusion
- Diffusion (chemical)
- Diffusion (porous media)
- Engineering materials (by type)
- Engineering mechanics
- Environmental engineering
- Material mechanics
- Material properties
- Materials engineering
- Mortars
- Reinforced concrete
- Salts
- Thermodynamics
- Transport phenomena
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