Experiment Study on Concrete Resistance to Chloride Ion Penetration

2014 ◽  
Vol 716-717 ◽  
pp. 236-239
Author(s):  
Wei Hong Li ◽  
Ying Ying Xu ◽  
Yi Han Wang
Keyword(s):  
Chloride Ion ◽  
Concrete Block ◽  
Load Level ◽  
Diffusion Method ◽  
Environment Interaction ◽  
Ion Content ◽  
Chloride Ion Penetration ◽  
Conservation Condition ◽  
Ion Erosion ◽  
Permeability Of Chloride Ion

The influence law of permeability of chloride ion in concrete of load level, curing condition under the sustained pressure load and the corrosion environment interaction is researched in this article, which is through natural diffusion method. Experimental results show that as the load level increases, there is a tendency of the chloride ion content after the first increase and then decrease, the turning point in the middle remains to be further studied. Good conservation condition reduces large holes and harmful holes in concrete block, thereby reduce the porosity and improve resistance to chloride ion erosion.

The Law of Penetration Research of Chloride Ion in Concrete under Chloride Environment and Sustained Load

2014 ◽  
Vol 1079-1080 ◽  
pp. 374-378
Author(s):  
Wei Hong Li ◽  
Ying Ying Xu ◽  
Chang Long Wu
Keyword(s):  
Chloride Ion ◽  
Concrete Block ◽  
Load Level ◽  
Sustained Load ◽  
Test Time ◽  
Environment Interaction ◽  
Curing Conditions ◽  
Chloride Environment ◽  
Ion Erosion ◽  
Permeability Of Chloride Ion

This paper studies theinfluence law of permeability of chloride ion in concrete of experiment time,load level, curing condition under the sustained pressure load and thecorrosion environment interaction, which is through natural diffusion method.Experimental results show that with the extension of the test time, chlorideion permeability increases. As the load level increases, there is a tendency ofthe chloride ion content after the first increase and then decrease, theturning point in the middle remains to be further studied. Sufficient waterretention curing conditions, making holes in concrete block unhydratedparticles can continue to get the necessary hydration water, thus continuoushydration leads to increased porosity of roughness, but reduces the resistanceto chloride ion erosion.

Penetration of Chlorine Ion in Concrete under the Coupling Effect of the Continues Pressure Load and the Corrosion Environment

2014 ◽  
Vol 633 ◽  
pp. 140-144
Author(s):  
Wei Hong Li ◽  
Ying Ying Xu
Keyword(s):  
Penetration Depth ◽  
Coupling Effect ◽  
Chloride Ion ◽  
Load Level ◽  
Chloride Ions ◽  
Diffusion Method ◽  
Test Time ◽  
Environment Interaction ◽  
Concrete Durability ◽  
Pressure Load

This paper studies the influence law of experiment time, load level under sustained pressure load and the corrosion environment interaction on the permeability of chloride ion in concrete,which is through natural diffusion method. Experimental results show that with the increase of the test time, the penetration depth of chloride ions in concrete and the content of chloride ions in the same penetration depth is growing. As the load level increases, there is a tendency of the chloride ion content after the first increase and then decrease, the turning point in the middle remains to be studied. The research results have a certain significance for concrete durability design and life prediction in corrosion environment.

The Experimental Research on the Anti-Corrosion Performance of Concrete with Different Mineral Admixtures under Sulfate and Chloride Environment

2014 ◽  
Vol 638-640 ◽  
pp. 1431-1435
Author(s):  
Wen Xun Qian ◽  
Yan Chi Zhang ◽  
Xun Jie Chen ◽  
You Lin Ouyang
Keyword(s):  
Loss Rate ◽  
Chloride Ion ◽  
Strength Loss ◽  
Sulfate Attack ◽  
Mineral Admixtures ◽  
Corrosion Performance ◽  
Chloride Ion Penetration ◽  
Initial Stage ◽  
Chloride Environment ◽  
Permeability Of Chloride Ion

The performance of resistance to sulfate attack and permeability of chloride ion on concrete with different mineral admixtures (fly ash, slag single or both adding) under sulfate and chloride environment were discussed. The results indicated the performance of resistance to salt attack on concrete with appropriate mineral admixtures was improved. Under chloride environment, the resistance to sulfate attack coefficient of testing mortars descended, and compressive strength loss rate of concrete was raised after dry-wet cycles. Therefore, the performance of resistance to salt attack on concrete was decreased in this environment. Besides, on the initial stage of corrosion, the ability to resist chloride ion penetration of concrete was improved under sulfate environment, while the penetrating of chloride ion was accelerated on the later stage.

scholarly journals Sulfate and Chloride Resistance Properties of Portland Cement Blends

2021 ◽  
Vol 12 (1) ◽  
pp. 69-75
Author(s):  
Abu Zakir Morshed ◽  
Suraiya Hashi ◽  
Nitai Biswas ◽  
Miftaul Sadik
Keyword(s):  
Linear Expansion ◽  
Chloride Ion ◽  
Sulfate Solution ◽  
Engineering Science ◽  
Penetration Test ◽  
Cylinder Test ◽  
Chloride Ion Penetration ◽  
Chloride Resistance ◽  
Mortar Bar ◽  
Permeability Of Chloride Ion

About 53% area of Bangladesh is alluvial deposited and affected by sulfate, salinity and chloride in water and soil. Existing sulfate and chloride can severely damage the building in coastal regions. In this paper durability of cement is evaluated on the basis of strength of mortar cube, concrete cylinder test. Besides the sulfate resistance is measured by change of length of the mortar bar specimens during exposure to sulfate solution and the attacking chloride properties by Rapid chloride ion penetration test using OPC, PCC, 20% FA, 30% FA and 40% FA. The strength was observed in cube sample about 40.65, 37.2MPa after 13 weeks in sulfate solution and linear expansion was obtained about 0.28% and 0.133% for OPC and PCC cement with reference to the water. The compressive strength of the cylindrical specimens was about 16.96, 18.34 MPa for OPC and PCC, respectively at the age of 28 days. The permeability of chloride ion of OPC sample was 22.8% higher than the PCC at this age. Journal of Engineering Science 12(1), 2021, 69-75

Chloride Ion Erosion in Concrete under Sustained Axial Pressure

2016 ◽  
Vol 680 ◽  
pp. 402-405
Author(s):  
Zong Ming Yang ◽  
Wei Hong Li ◽  
Yi Han Wang
Keyword(s):  
Axial Compression ◽  
Concrete Structure ◽  
Chloride Ion ◽  
Chloride Ions ◽  
Reinforcement Corrosion ◽  
Compression Load ◽  
Durability Design ◽  
Chloride Ion Penetration ◽  
Chloride Environment ◽  
Ion Erosion

As one of the leading causes of influencing the durability of concrete structure, reinforcement corrosion has been a central issue. Erosion of chloride ions on the concrete structure is influenced by many factors. This is not only concerned with its own structural properties, but also to its environment, to withstand the load and other factors. This article has carried on an experiment which researches on the rules of chloride ion penetration in the sustained axial compression after different corrosive time, when the concrete is corroded under the joint action of axial compression load and chlorine salt circulation. The results prove that, with the increase of Intensity of load and the cycle time of chlorine salt, the number of Chloride ion ingress in concrete continues to increase. The experimental results may provide a reference to the durability design of concrete in chloride environment.

Penetration Behavior of Chloride Ions into Concrete in Coastal Areas

2006 ◽  
Vol 302-303 ◽  
pp. 584-590
Author(s):  
Yoshihiro Masuda ◽  
F.-R. Wu ◽  
S. Nakamura ◽  
S. Sato
Keyword(s):  
Chloride Ion ◽  
Concrete Specimen ◽  
Chloride Ions ◽  
Ion Content ◽  
Exposure Test ◽  
Total Chloride ◽  
Chloride Ion Penetration ◽  
Apparent Diffusion ◽  
Penetration Behavior ◽  
Ion Penetration

Exposure test on chloride ion penetration behavior into Concrete in coastal area was implemented. The distances between concrete specimens and coast were changed in the range from 50 to 150 meters, and water-cement ratios (W/C) were 45, 55, 60 and 65 %. The total chloride ion content at each different depth from surface of concrete specimen was measured at the age of 1, 2, 3, 5, 7, 8 and 10 years. In this paper, apparent diffusion coefficient (D) and chloride ion content on surface of concrete (C0) were calculated by inverse analyses from the measured total chloride ion content, and the chloride ion penetration behavior was simulated using the calculated D and C0. As a result, the chloride ion penetrated in concrete with a W/C of 60 % at a point 50 m from the sea for 10 years was estimated approximately 0.2 kg/m3.

Chloride Ion Diffusion Model of the Concrete under Multiple Factors

2016 ◽  
Vol 866 ◽  
pp. 43-48
Author(s):  
Cheng Fang Yuan ◽  
Di Tao Niu
Keyword(s):  
Factor Model ◽  
Chloride Ion ◽  
Actual Situation ◽  
Ion Diffusion ◽  
Ion Content ◽  
Multiple Factors ◽  
Main Indicator ◽  
Chloride Environment ◽  
Permeability Of Chloride Ion ◽  
Chloride Ion Diffusion

Durable life of concrete structures under the chloride environment depends on the permeability of chloride ion, and the chloride ion diffusion coefficient is the main indicator that reflects the permeability of chloride ion. Based on the Fick’s second law, a multi-factor model of the chloride ion diffusion is established. In this model, the influences of temperature, humidity, age of the concrete, fly ash and carbonation are taken into consideration. And the model is verified by engineering test data from the concrete structure under the wet and dry areas of marine. The results show that the calculated and measured values of the chloride ion content agree well, the actual situation of the project could be basically reflected. The multi-factor model of the chloride ion diffusion is practical.

scholarly journals The Chloride Ion Penetration Mechanism in Basalt Fiber Reinforced Concrete under Compression after Elevated Temperatures

2021 ◽  
Vol 11 (21) ◽  
pp. 10137
Author(s):  
Limin Lu ◽  
Shaohua Wu ◽  
Yuwen Qin ◽  
Guanglin Yuan ◽  
Qingli Zhao ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Elevated Temperatures ◽  
Coupling Effect ◽  
Basalt Fiber ◽  
Chloride Ion ◽  
Fiber Reinforced Concrete ◽  
Ion Permeability ◽  
Ion Content ◽  
Chloride Ion Penetration ◽  
Ion Penetration

Chloride ion penetration frequently leads to steel corrosion and reduces the durability of reinforced concrete. Although previous studies have investigated the chloride ion permeability of some fiber concrete, the chloride ion permeability of the basalt fiber reinforced concrete (BFRC) has not been widely investigated. Considering that BFRC may be subjected to various exposure environments, this paper focused on exploring the chloride ion permeability of BFRC under the coupling effect of elevated temperatures and compression. Results demonstrated that the chloride ion content in concrete increased linearly with temperature. After exposure to different elevated temperatures, the chloride ion content in BFRC varied greatly with increasing stress. The compressive stress ratio threshold for the chloride ion penetration was measured. A calculation model of BFRC chloride ion diffusion coefficient under the coupling effect of elevated temperatures and mechanical damage (loading test) was proposed.

The Durability Failure of Pre-Damaged Concrete Induced by Mechanical Load

2012 ◽  
Vol 594-597 ◽  
pp. 1061-1065
Author(s):  
Fang Zhi Zhu ◽  
Fu Xiang Jiang ◽  
Jun Shang ◽  
Zhong Hua Bi
Keyword(s):  
Chloride Ion ◽  
Load Level ◽  
Uniaxial Tensile ◽  
Chloride Diffusion Coefficient ◽  
Freezing And Thawing ◽  
Chloride Ion Penetration ◽  
Negative Effect ◽  
The Impact ◽  
Durability Of Concrete ◽  
Ion Penetration

Chloride ion penetration and freezing and thawing damage are the two main factors that affect the durability of concrete structures. Through the chloride ion penetration test and freezing and thawing test of concrete specimens after tensile and compressive loading, the influence of load-induced damage on the long-term durability of concrete was studied. The results showed that the apparent chloride diffusion coefficient of concrete increased by 6.4% and 34%, and the surface chloride concentration increased 10% and 40%, respectively, both of which showed the "negative effect" when the uniaxial tensile load level reached the 65% and 75% of the ultimate capacity. However, with the increasing uniaxial compressive load level, the impact on the frost resistance of concrete experienced a transformation from the "positive effect" to the "negative effect".

Performance of Polyaspartic Ester Polyurea in Marine Engineering Protection

2011 ◽  
Vol 66-68 ◽  
pp. 1533-1538
Author(s):  
Lin Yang ◽  
Ping Lu
Keyword(s):  
Permeability Coefficient ◽  
Microscopic Analysis ◽  
Chloride Ion ◽  
Diffusion Method ◽  
Ion Permeability ◽  
Marine Structures ◽  
Chloride Ion Penetration ◽  
Marine Concrete ◽  
Marine Engineering ◽  
Engineering Protection

In this work, the natural diffusion method and rapid chloride ion penetration method (RCM) are used to study the performance of polyaspartic aster (PAE) coating in marine structures protection. The ability of concrete resistance chloride ion permeability in marine environment is tested by such two methods. The results obtained by the two methods are compared, they agree well. The paper also study the change chloride ion permeability coefficient of marine concrete with different coating thickness and use scanning electron microscopy (SEM) to microscopic analysis. From microscopic research, only a few tiny holes appear in the sample section after 6 months corrosion. Compared with the samples without corrosion, the PAE coating still remains homogeneous and dense.

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