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.

PERFORMANCE OF STEEL MICRO FIBER REINFORCED MORTAR MIXTURES CONTAINING PLAIN, BINARY AND TERNARY CEMENTITIOUS SYSTEMS

2016 ◽  
Vol 11 (4) ◽  
pp. 109-130 ◽  
Author(s):  
Ali Mardani-Aghabaglou ◽  
Cihat Yüksel ◽  
Hojjat Hosseinnezhad ◽  
Kambiz Ramyar
Keyword(s):  
Total Mass ◽  
Drying Shrinkage ◽  
Chloride Ion ◽  
Mineral Admixtures ◽  
Impact Loads ◽  
Test Results ◽  
Chloride Ion Penetration ◽  
Micro Cracks ◽  
The Matrix ◽  
Cementitious Systems

Steel micro fibers provide strengthening, toughening and durability improvement mechanisms in cementitious composites. However, there is not much data in the literature regarding how the extent of their effectiveness changes depending on the type of matrix being reinforced. For clarifying this point, the influence of a constant volumetric ratio (1%) of 6 mm long steel micro fibers on the performance of 5 mortar mixtures was investigated and were prepared using plain, binary and ternary cementitious systems. A total of 10 mixtures were cast. The mineral admixtures used in the study include silica fume (SF), metakaolin (MK) and a Class C fly ash (FA). While the replacement levels of SF and MK were 10% by weight of the total mass of the binder, this ratio was chosen as 30% for FA. In addition to the behavior of the mixtures under compressive, flexural and impact loads, abrasion, water absorption, chloride ion penetration, freezing-thawing resistance and drying shrinkage characteristics of the mixtures were determined. Test results indicate that generally the refinement in the pore structure of the matrix provided by mineral admixtures and the increase in resistance against growth and coalescence of micro-cracks provided by fibers produce a synergistic effect and improve the investigated performances of the mixtures.

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.

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

Effect of Mineral Admixtures on Durability of Concrete Structure Subjected to Alkaline Saline Corrosions

2006 ◽  
Vol 302-303 ◽  
pp. 68-72
Author(s):  
Quan Lin Niu ◽  
Nai Qian Feng
Keyword(s):  
Chloride Ion ◽  
Sulfate Attack ◽  
Mineral Admixtures ◽  
Alkali Silica Reaction ◽  
Sulfate Ion ◽  
Diffusion Test ◽  
Alkali Ions ◽  
Furnace Slag ◽  
Drying Test ◽  
Durability Of Concrete

Effect of a combination of alkali ions, sulfate ion and chloride ion on durability of concrete structures was analyzed, and the effect of different mineral admixtures on deterioration caused by Cl- penetration, sulfate attack and alkali-silica reaction was investigated. It is shown from wetting-drying test that sulfate attack on concrete was greatly relieved in high Cl- concentration solution, but diffusion test showed that Cl- diffusion was accelerated by SO4 2- ion existence as SO4 2- may incorporate with aluminum phase prior to Cl- ion. Replacement of cement with mineral admixtures such as ground blast furnace slag (SL) and metalaolin (MK) were beneficial for absorption of Cl- ion penetrated into paste, while ASTM C441 showed that fly ash (FA), metakaolin and natural zeolite (NZ) exhibited effectiveness in controlling Alkali-silica reaction (ASR).

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.

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.

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