Correlating the Chloride Diffusion Coefficient and Pore Structure of Cement-Based Materials Using Modified Noncontact Electrical Resistivity Measurement

2019 ◽  
Vol 31 (3) ◽  
pp. 04019006 ◽  
Author(s):  
Rui He ◽  
Hailong Ye ◽  
Hongyan Ma ◽  
Chuanqing Fu ◽  
Xianyu Jin ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Diffusion Coefficient ◽  
Pore Structure ◽  
Resistivity Measurement ◽  
Chloride Diffusion ◽  
Electrical Resistivity Measurement ◽  
Chloride Diffusion Coefficient ◽  
Cement Based Materials

Influence of Stone Dust in Manufactured Sand on Resisting Chloride Penetration in Marine Concretes

2012 ◽  
Vol 174-177 ◽  
pp. 1419-1423
Author(s):  
Jian Bo Xiong ◽  
Peng Ping Li ◽  
Sheng Nian Wang
Keyword(s):  
Diffusion Coefficient ◽  
Pore Structure ◽  
Binding Capacity ◽  
Chloride Penetration ◽  
Dust Content ◽  
Chloride Diffusion ◽  
Fine Aggregate ◽  
Chloride Diffusion Coefficient ◽  
Manufactured Sand ◽  
Stone Dust

In China, manufactured sand has been widely used as fine aggregate in concrete. Therefore, it is necessary to investigate the effect of manufactured sand on durability of concrete. This research studies the influence of stone dust content in manufactured sand on resisting chloride penetration in marine concrete by strength and other physical mechanical tests, XRD, TGA and pore structure analysis. Test results have shown that the chloride diffusion coefficient increased with increasing the stone dust content in manufactured sand when the stone dust content increasing from 3% to 13%. The stone dust in fine aggregate was participated in hydration procedure of cementitious, which will promote the hydration degree of cementitious and increase the chloride binding capacity of hydration product. The influence of stone dust in fine aggregate on chloride diffusion coefficient were the combined effects of concrete pore structure and cementitious hydration products, and the porosity and pore size distribution were the main factors that influence the changes of diffusion coefficient.

scholarly journals Assessment of Electrical Resistivity and Oxygen Diffusion Coefficient of Cementitious Materials from Microstructure Features

Materials ◽  
2021 ◽  
Vol 14 (12) ◽  
pp. 3141
Author(s):  
Renzhan Zhou ◽  
Qiang Li ◽  
Jiandong Wang ◽  
Kewen Zhou ◽  
Rui He ◽  
...  
Keyword(s):  
Electrical Resistivity ◽  
Diffusion Coefficient ◽  
Oxygen Diffusion ◽  
Cement Mortar ◽  
Resistivity Measurement ◽  
Cementitious Materials ◽  
Gas Diffusion ◽  
Electrical Resistivity Measurement ◽  
Capillary Porosity ◽  
Oxygen Diffusion Coefficient

A newly proposed modified non-contact electrical resistivity measurement was used to test the resistivity of concrete and cement mortar. The oxygen diffusion coefficients of concrete and mortar were determined by a gas diffusion measurement, and the capillary porosity of concrete and cement mortar was measured by mercury intrusion porosimetry (MIP) measurement. The obtained electrical resistivity and capillary porosity results were verified with other researchers’ data, the measured electrical resistivity results can be estimated by a simple equation from the capillary porosity results. The obtained oxygen diffusion coefficient results were quantitatively correlated with capillary porosity and electrical resistivity measurement results. The proposed equations can be practically used to assess the electrical resistivity and oxygen diffusion coefficient.

Correlation Test between Chloride Diffusion Coefficient and Microcosmic Pore Structure of Mineral Admixture Concrete

2013 ◽  
Vol 438-439 ◽  
pp. 81-86
Author(s):  
Yun Dong Zhu ◽  
Yang Li ◽  
Zhuo Zhao
Keyword(s):  
Diffusion Coefficient ◽  
Pore Structure ◽  
Nonlinear Regression ◽  
Mineral Admixture ◽  
Raw Material ◽  
Chloride Diffusion ◽  
Index Test ◽  
Chloride Diffusion Coefficient ◽  
Regression Relationship ◽  
Structure Index

Cube crushing strength, resistance to chloride penetration and gas adsorption analysis of mineral admixture concrete are tested to analyze the effect of raw material on chloride diffusion coefficient and its regression relationship with concrete microcosmic pore structure index. Test results show that chloride diffusion coefficient at different age increased with the increase of water-binding material ratio, decreased with the increase of cement dosage and both appeared a good nonlinear regression relationship. Chloride diffusion coefficient at different age increased with the increase of concrete microcosmic pore structure index. 56d chloride diffusion coefficient has a good linear correlation with microcosmic pore structure index, and 84d chloride diffusion coefficient has a good nonlinear regression relationship with microcosmic pore structure index.

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