Details

Autor(en) / Beteiligte

• Liang, Dong
• Fang, Ke-Wei
• Zhang, Jin-Qiu
• Huang, Hai-Bin
• Huang, Ming-Jian
• Du, Peng

Titel

Electrical behavior analysis of the cementitious capillary crystalline conductive coatings for monitoring concrete strains and cracks

Ist Teil von

• Construction & building materials, 2024-08, Vol.438, p.137294, Article 137294

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2024

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Cementitious material is used to make conductive coatings for structural health monitoring of concrete structures with the advantages of low cost, good durability, similar properties to concrete, and easy replacement. In this paper, the feasibility of using cementitious capillary crystalline conductive coating to monitor surface strains and cracks in concrete structures is verified through a series of experiments and simulations. At first, the conductive coating was fabricated and its resistivity was measured. The relationship between the resistivity of the coating and the proportion of conductive particles was investigated through experiments. The experimental results showed that all types of coatings exhibit significant percolation phenomena and the resistivity stabilizes after 72 hours of curing of the coating. Then, an aggregate placement generation program suitable for the coating was developed, and numerical simulations were performed based on the microscopic cells of the coating generated by the program. The effect of conductive particles on the conductive properties of the coating was analyzed by simulating the resulting cross-section images of current density. The formation of conductive pathways is therefore explained on a microscopic level. And finally, based on the experimental and simulation results, a loading experiment was designed to measure the changes in electrical resistivity of surface coatings on concrete specimens during the loading process. The experimental results proved that this type of coating has a good sensing ability for strains and cracks of concrete surfaces. •Conductive coatings exhibit significant percolation and coating with flake graphite can have better conductivity.•An aggregate placement generation program is developed for different types of particles.•Formation of conductive pathways within coatings analyzed by COMSOL Multiphysics.•Sensing small cracks successfully through resistivity changes.