Chloride Ions Penetration Resistance of Steam-Cured Concrete for Railway Precast Elements

2011 ◽  
Vol 219-220 ◽  
pp. 1419-1422
Author(s):  
Zhi Min He ◽  
Jun Zhe Liu ◽  
Tian Hong Wang
Keyword(s):  
Blast Furnace Slag ◽  
High Performance ◽  
Penetration Resistance ◽  
Chloride Ions ◽  
Mineral Admixtures ◽  
Concrete Mix ◽  
Binder Type ◽  
Precast Elements ◽  
Astm C1202 ◽  
Furnace Slag

By use of ASTM C1202, this paper studied the influence of mineral admixtures on the chloride ions penetration resistance of the steam-cured concrete. The experimental results indicated that mineral admixtures improved the permeability properties of high-performance concretes, but at different rates depending on the binder type. FA required a relatively longer time to get its beneficial effect. For each 10%~40% replacement of OPC by FA in a concrete mix, the values of coulomb charge of steam-cured and standard curing concrete reduces by 8%~17% at180 days. When 30% weight of the OPC were replaced by FA and ground blast furnace slag(GBFS), the inclusion of 30% mineral admixtures provided a significant improvement to the chloride ions penetration resistance properties of steam-cured and standard curing concrete at 28 days and 180 days, especially for the combination of 10% FA and 20% GBFS (double adding).

Chloride Ions Penetration Resistance of New-Old Concrete

2011 ◽  
Vol 366 ◽  
pp. 518-521
Author(s):  
Zhi Min He ◽  
Jun Zhe Liu
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Beneficial Effect ◽  
Blast Furnace Slag ◽  
Penetration Resistance ◽  
Chloride Ions ◽  
Mineral Admixtures ◽  
Compound System ◽  
Astm C1202 ◽  
Furnace Slag

By use of ASTM C1202, this paper studied the influence of mineral admixtures on the chloride ions penetration resistance of the new-old concrete compound system. The results indicate that the performance of new-old concrete exert significant influence on the new-old concrete compound system. The addition of mineral admixtures improve the permeability properties of new-old concrete. Adding fly ash(FA) require a relatively longer time to get its beneficial effect. When 30% weight of cement is replaced by 10% FA and 20% ground blast furnace slag(GGBFS), the inclusion of 30% mineral admixtures significantly improve the chloride ions penetration resistance properties of the new-old concrete compound system at 28 days and 180 days.

Effect of Mineral Admixtures and Water/Binder Ratios on the Resistance to the Chloride Ions Penetration into Concrete

2011 ◽  
Vol 99-100 ◽  
pp. 758-761
Author(s):  
Yan Jun Hu ◽  
Yan Liang Du
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Silica Fume ◽  
Blast Furnace Slag ◽  
Chloride Ion ◽  
Test Methods ◽  
Chloride Ions ◽  
Mineral Admixtures ◽  
Chloride Permeability ◽  
Furnace Slag

In this study, concrete prisms were made with three mineral admixtures: fly ash, blast furnace slag or silica fume and with three water-to-binder ratios(w/b). Chloride penetration was measured by the rapid chloride permeability test (RCPT)-ASTM C1202, 150-days ponding test and alternate wetting and drying test by cyclic loading with salt solution and oven drying, and the results by the three test methods were compared. This paper discussed the effects of mineral admixtures and w/b on the concrete chloride permeability. Blending concrete with blast furnace slag, fly ash or silica fume was beneficial with regard to the resistance against chloride ion penetration. Concrete specimens with lower w/b showed lower chloride permeability.

The Influence of Blast Furnace Slag Content on Durability of High Performance Concrete

2014 ◽  
Vol 600 ◽  
pp. 514-519
Author(s):  
Aissa Talah ◽  
F. Kharchi
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
High Performance ◽  
Mechanical Characteristics ◽  
High Performance Concrete ◽  
Chloride Ions ◽  
Granulated Blast Furnace Slag ◽  
And Migration ◽  
Chloride Environment ◽  
Furnace Slag

This paper reports an experimental study of the influence of finely ground-granulated blast-furnace slag (GGBS) used as partial substitute for Portland cement (PC) on the mechanical properties and durability of high performance concretes. The analysis of the experimental results on concrete at 17.5% content of blast furnace slag with a fineness modulus of 8500 cm2/g, in a chloride environment, showed that it contributes positively to the perfection of its mechanical characteristics, its durability with respect to water absorption and migration of chloride ions. On the basis of the experiments performed, it can be concluded that the GGBS is suitable for formulation of high performance concretes (HPC) and their properties are significantly better compared to the reference concrete (RC).

scholarly journals Chloride Diffusion and Induced Reinforcement Corrosion in Concrete with Fly Ash and Ground-Granulated Blast-Furnace Slag Exposed to Marine Submerged Zone1

2020 ◽  
Vol 2020 ◽  
pp. 1-17
Author(s):  
Rui Zhao ◽  
Zuquan Jin ◽  
Guangyan Feng ◽  
Jianqiang Li
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Chloride Ions ◽  
Test Method ◽  
Mineral Admixtures ◽  
Granulated Blast Furnace Slag ◽  
Wire Beam Electrode ◽  
Furnace Slag ◽  
Test Result

This paper investigates the influence of mineral admixtures fly ash (FA) and ground-granulated blast-furnace slag (GGBS), the byproducts of industry, on chloride ions migration and corrosion resistance performance. A novel preparation method of wire beam electrode (WEB) was also introduced to explore the excellent corrosion-resistant capacity of concrete with mineral admixtures. By comparing concrete specimens with and without FA and GGBS, the test result of wire beam electrode, rapid chloride migration (RCM), and electrochemical tests highlight the positive impact of fly ash and GGBS against chloride ions migration, respectively. Concrete with fly ash and GGBS supplies an advanced protection effect of ordinary Portland cement; meanwhile, CO2 emission amount can be significantly reduced. Moreover, homemade wire beam electrode was proved to be a novel and reliable test method against corrosion, which has agreement with the test result of an electrochemical device.

scholarly journals Influence of the Type of Cement and the Addition of an Air-Entraining Agent on the Effectiveness of Concrete Cover in the Protection of Reinforcement against Corrosion

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4657
Author(s):  
Wioletta Raczkiewicz ◽  
Peter Koteš ◽  
Petr Konečný
Keyword(s):  
Blast Furnace Slag ◽  
Concrete Cover ◽  
Chloride Ions ◽  
Corrosion Process ◽  
Simultaneous Action ◽  
Freezing And Thawing ◽  
Pulse Technique ◽  
Concrete Admixtures ◽  
Concrete Mix ◽  
Furnace Slag

The concrete cover is the basic protection of the reinforcement against the influence of external factors that may lead to its corrosion. Its effectiveness depends mainly on the composition of the concrete mix, including the cement used. Depending on external environmental factors that may aggressively affect the structure, various types of cements and concrete admixtures are recommended. The paper presents the results of tests that allow us to assess the effect of the type of cement used and the air-entraining agent on the effectiveness of the concrete cover as a layer protecting the reinforcement against corrosion. In order to initiate the corrosion process, the reinforced concrete specimens were subjected to cycles of freezing and thawing in a sodium chloride solution. The degree of advancement of the corrosion process was investigated using the electrochemical galvanostatic pulse technique. Additionally, the microstructure of specimens taken from the cover was observed under a scanning electron microscope. The research has shown that in the situation of simultaneous action of chloride ions and freezing cycles, in order to effectively protect the reinforcement against corrosion, the application of both blast-furnace slag cement and an air-entraining agent performed the best.

Workability and Strength Characteristics of High Performance Concrete with Steel Slag Admixture

2008 ◽  
Vol 400-402 ◽  
pp. 415-419 ◽  
Author(s):  
Yun Feng Li ◽  
Ling Wang ◽  
Yan Yao ◽  
Hui Lin
Keyword(s):  
Mechanical Properties ◽  
Blast Furnace Slag ◽  
High Performance ◽  
High Performance Concrete ◽  
Steel Slag ◽  
Mineral Admixtures ◽  
Slag Powder ◽  
Steel Slag Powder ◽  
Different Types ◽  
Furnace Slag

Workability, mechanical properties and durability of concrete can be greatly improved with the advanced mineral admixtures such as steel slag powder. The workability and mechanical properties of steel slag concrete with different types of steel slag and different dosage of admixtures are studied. The experimental results showed the effect of steel slag powder on concrete performance. When compound mineral admixtures with steel slag powder and blast-furnace slag powder are mixed into concrete, the performance of concrete can be improved further due to the synergistic effect and mutual activation.

Influence of Blast Furnace Slag Content on High Performance Concrete Behavior

2014 ◽  
Vol 911 ◽  
pp. 428-432
Author(s):  
Aissa Talah ◽  
F. Kharchi
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
High Performance ◽  
High Performance Concrete ◽  
Chloride Ions ◽  
Partial Replacement ◽  
Granulated Blast Furnace Slag ◽  
And Migration ◽  
Chloride Environment ◽  
Furnace Slag

This paper reports an experimental study of influence of finely ground-granulated blast-furnace slag (GGBS) used as partial replacement of Portland cement (PC) on the mechanical properties and durability of high performance concretes. The analysis of the experimental results on concrete at 17.5% content of blast furnace slag with a fineness modulus of 8500 cm2/g, in a chloride environment, showed that it contributes positively to the perfection of its mechanical characteristics, its durability with respect to water absorption and migration of chloride ions. On the basis of the experiments performed, it can be concluded that the GGBS is suitable for formulation of high performance concretes (HPC) and their properties are significantly better compared to the reference concrete (RC).

scholarly journals Effect of Assembly Unit of Expansive Agents on the Mechanical Performance and Durability of Cement-Based Materials

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 731
Author(s):  
Lin Wang ◽  
Chunxue Shu ◽  
Tiantian Jiao ◽  
Yong Han ◽  
Hui Wang
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Chloride Ion ◽  
Penetration Resistance ◽  
Mineral Admixtures ◽  
Expansion Rate ◽  
Chloride Ion Penetration ◽  
Assembly Unit ◽  
Furnace Slag

This paper studies the influence of assembly unit of expansive agents (CaO and calcium sulphoaluminate) on the limited and free compressive strengths, the limited expansion rate, carbonation resistance, chloride ion penetration resistance and corrosion resistance of reinforcement concrete. The dosages of expansive agent were 0%, 3%, 6%, 9%, and 12% by the total amount of cementitious materials. Two kinds of mineral admixture (blast furnace slag and fly ash) were applied in this study. Results show that suitable dosage (lower than or equal to 9%) of double expansion agent with a large amount of mineral admixtures can improve the limited and free compressive strengths. However, when the dosage of the double expansion agent is higher than 9%, the addition of the double expansion agent leads to the reduction of limited and free compressive strengths. The variation of the limit expansion rate reaches the maximum value when the curing age is 14 days. The increasing addition of expansive agents and lower water-binder ratio demonstrate positive effect on the limited expansion rate. Concrete with 60% mineral admixtures (fly ash and ground granulated blast furnace slag) shows lower limited expansion rate and higher compressive strength than the concrete with 50% mineral admixtures. Finally, the incorporation of double expansion agent can improve the resistance to carbonation, chloride ion penetration resistance, anti-corrosion of steel bars and mechanical strengths (the limited and free compressive strengths).

scholarly journals Study on the Durability of Road Concrete with Blast Furnace Slag Affected by the Corrosion Initiated by Chloride

2021 ◽  
Vol 2021 ◽  
pp. 1-16
Author(s):  
Liliana Maria Nicula ◽  
Ofelia Corbu ◽  
Mihai Iliescu ◽  
Andrei Victor Sandu ◽  
Andreea Hegyi
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Rapid Test ◽  
Chloride Ions ◽  
The Road ◽  
Concrete Mixtures ◽  
Chlorine Ions ◽  
Astm C1202 ◽  
Furnace Slag ◽  
Physical And Mechanical Characteristics

In order to assess the resistance of the road concrete to the penetration of the chloride ions, we used the rapid test RCPT in compliance with ASTM C1202. But, in order to increase the reliability of the rapid test of assessing the resistance of chloride ions’ permeability through measurements of the electrical conductivity, after finishing the RCPT test, we have also measured the depth of the chloride front migrating in the concrete. Road concrete mixtures were prepared in which blast furnace slag (GGBS) was incorporated as a binder and blast furnace slag (ABS) as crushed slag aggregate to the size of 0/4 mm. The effect of the blast furnace slag on the RCPT results was investigated and correlated with porosity trends, carbonatation layer depth, and with the compression strength values, by comparison with the level of results obtained on concrete mixtures made with conventional materials. The measurement of the migrated chlorine front in the concrete together with the determined physical and mechanical characteristics confirms the efficiency of the blast furnace slag incorporated in the concrete and supports the reliability of the rapid penetration test of chlorine ions RCPT using the procedure from ASTM C 1202.

scholarly journals Effect of Mineral Admixtures on the Performance of Low-Quality Recycled Aggregate Concrete

Crystals ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 596
Author(s):  
Yasuhiro Dosho
Keyword(s):  
Blast Furnace ◽  
Fly Ash ◽  
Blast Furnace Slag ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Mineral Admixtures ◽  
Structural Concrete ◽  
Aggregate Concrete ◽  
Granulated Blast Furnace Slag ◽  
Furnace Slag

To improve the application of low-quality aggregates in structural concrete, this study investigated the effect of multi-purpose mineral admixtures, such as fly ash and ground granulated blast-furnace slag, on the performance of concrete. Accordingly, the primary performance of low-quality recycled aggregate concrete could be improved by varying the replacement ratio of the recycled aggregate and using appropriate mineral admixtures such as fly ash and ground granulated blast-furnace slag. The results show the potential for the use of low-quality aggregate in structural concrete.

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