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Time-varying model for predicting the resistivity of coral aggregate concrete
Highlights An improved alternating current method is used to test the coral concrete resistivity. The coral concrete resistivity increases with the addition of admixture and the decrease of water-cement ratio. Porosity was used to analyze the difference of coral concrete resistivity from the micro respect. A time-varying resistivity model of coral concrete is established.
Abstract As a new type of cement-matrix composite material, coral aggregate concrete exhibits excellent properties, such as local material availability and enhanced efficiency, while being cost-effective. Coral aggregate concrete can be viable for construction on islands and reefs. Reinforced concrete structures generally exhibit low durability in marine environments, owing to long-term corrosion by chloride salts. Therefore, resistance to chloride ion attacks plays a significant role in improving the durability of concrete structures. As a non-destructive testing technique, resistivity is used for characterising the resistance of concrete to chloride ion penetration. In this study, the resistivity of coral aggregate concrete is measured using an improved alternating-current test method, and the improved method overcomes the limitations that is prone to polarization reaction and heating of the solution under exposure to voltage for an extended period. Porosity was used to analyze the reasons for the different resistivity values of coral concrete from micro-aspects. The resistivity model at 365 days was established considering the effects of temperature, humidity, admixture, and water-binder ratio on coral aggregate concrete. The hydration characteristics of cement and admixture were used to establish a time-varying model for predicting the resistivity of coral aggregate concrete.
Time-varying model for predicting the resistivity of coral aggregate concrete
Highlights An improved alternating current method is used to test the coral concrete resistivity. The coral concrete resistivity increases with the addition of admixture and the decrease of water-cement ratio. Porosity was used to analyze the difference of coral concrete resistivity from the micro respect. A time-varying resistivity model of coral concrete is established.
Abstract As a new type of cement-matrix composite material, coral aggregate concrete exhibits excellent properties, such as local material availability and enhanced efficiency, while being cost-effective. Coral aggregate concrete can be viable for construction on islands and reefs. Reinforced concrete structures generally exhibit low durability in marine environments, owing to long-term corrosion by chloride salts. Therefore, resistance to chloride ion attacks plays a significant role in improving the durability of concrete structures. As a non-destructive testing technique, resistivity is used for characterising the resistance of concrete to chloride ion penetration. In this study, the resistivity of coral aggregate concrete is measured using an improved alternating-current test method, and the improved method overcomes the limitations that is prone to polarization reaction and heating of the solution under exposure to voltage for an extended period. Porosity was used to analyze the reasons for the different resistivity values of coral concrete from micro-aspects. The resistivity model at 365 days was established considering the effects of temperature, humidity, admixture, and water-binder ratio on coral aggregate concrete. The hydration characteristics of cement and admixture were used to establish a time-varying model for predicting the resistivity of coral aggregate concrete.
Time-varying model for predicting the resistivity of coral aggregate concrete
Sun, Zhen (author) / Zhang, Lu (author) / Niu, Ditao (author) / Wen, Bo (author) / Luo, Daming (author)
2020-08-13
Article (Journal)
Electronic Resource
English
Coral aggregate modification method and modified coral aggregate vegetation concrete
| European Patent Office | 2024
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