Research on the Durability of Reinforced Chemically Bonded Ceramics-Based Concrete Structural Members in Marine Environment

2014 ◽  
Vol 1044-1045 ◽  
pp. 189-194
Author(s):  
Zhong Xin Li ◽  
Qi Dong ◽  
Zhuo Bin Wei
Keyword(s):  
Marine Environment ◽  
Accumulation Rate ◽  
Chloride Ion ◽  
Structural Members ◽  
Ion Permeability ◽  
Chloride Ion Penetration ◽  
Corrosion Experiment ◽  
Electric Flux ◽  
Astm C1202 ◽  
Weight Loss Ratio

In order to study the durability of reinforced chemically bonded ceramics-based concrete structural members in marine environment, both the experiment of chloride ion permeability-resistance and rapid corrosion experiment of rebar in the CBC concrete were conducted. The methods of ASTM C1202,RCM and NEL were used to comprehensively assess the ability of chloride ion permeability-resistance of CBC concrete, electric flux and unsteady migration coefficients were taken as estimate indexes, while in the rapid corrosion experiment of rebar under the condition of immersing-drying circulating, rusty accumulation rate and weight loss ratio were taken as estimate indexes. The results of experiments indicate that CBC concrete has strong resistibility for chloride ion penetration, however, it cannot protect the internal rebar effectively, for the reason that the rebar in this test has been seriously corroded.

Effect of Metakaolin-Based Modifier on the Permeability of Concrete Structure in the Marine Environment

2013 ◽  
Vol 438-439 ◽  
pp. 117-120
Author(s):  
Jun Tao Ma ◽  
Liang Yan ◽  
Yu Ping Tong ◽  
Hui Xian Wang
Keyword(s):  
Fly Ash ◽  
Marine Environment ◽  
Concrete Structure ◽  
Chloride Ion ◽  
Penetration Resistance ◽  
Chloride Ion Penetration ◽  
Working Performance ◽  
Electric Flux ◽  
Penetration Behavior ◽  
Strength And Durability

Corrosion of the steel reinforcement in the concrete structure caused by chloride ion penetration becomes more serious in the marine environment. Metakaolin has been widely used in the concrete structure to improve the strength and durability. The combination of metakaolin (MK) and fine fly ash (FA) was studied in the article and the penetration behavior of concrete with various contents of metakaolin-based modifier is investigated. The penetration resistance of concrete was tested in combination of electric flux test. The improving mechanism was studied with mercury intrusion porosimetry analysis (MIP). The experiment results indicate that metakaolin-based modifier improved the penetration resistance of concrete obviously. The combination of fine fly ash weakened the water sucking action of metakaolin and preserved the working performance of concrete. The pore size distribution of concrete containing metakaolin-based modifier has been optimized to improve the microstructure and enhance the penetration resistance of concrete.

The Chloride Ion Penetration Model Coupled with Temperature and Moisture Transfer in Marine Environment

2012 ◽  
Vol 591-593 ◽  
pp. 2422-2427
Author(s):  
Juan Zhao
Keyword(s):  
Marine Environment ◽  
Moisture Transfer ◽  
Regional Climate ◽  
Chloride Ion ◽  
Chloride Penetration ◽  
Chloride Diffusion ◽  
Tidal Zone ◽  
Analog Simulation ◽  
Chloride Ion Penetration ◽  
Ion Penetration

Considering the complexity of the chloride ion penetration in concrete exposed to marine environment, an integrated chloride penetration model coupled with temperature and moisture transfer is proposed. The governing equations and parameters embody fully the cross-impacts among thermal conduction, moisture transfer and chloride ion penetration. Furthermore, the four exposure conditions are classified based on the different contact with the aggressive marine environment, and then the micro-climate condition on the concrete surface is investigated according to the regional climate characteristics, therefore, a comprehensive analog simulation to the chloride penetration process is proposed. To demonstrate that the proposed numerical model can correctly simulate the chloride diffusion in concrete, the integrated chloride diffusion model is applied in reproducing a real experiment, finally the model gives good agreement with the experimental profiles, and it is proved the tidal zone exposure results in a more severe attack on the reinforcement

Ultra-Low Cement Dosage Hill Sand Concrete’s Electric Flux and Carbonization Performance Study

2014 ◽  
Vol 584-586 ◽  
pp. 1332-1336
Author(s):  
Wei Wei Hu ◽  
Li Bin Xu ◽  
Yi Dong ◽  
Xiao Peng Nie
Keyword(s):  
Materials Science ◽  
Chloride Ion ◽  
Social Stability ◽  
Concrete Durability ◽  
Test Results ◽  
Performance Study ◽  
Chloride Ion Penetration ◽  
Concrete Materials ◽  
Electric Flux ◽  
Low Dosage

Concrete durability is closely related to the national economy and social stability, environmental protection, sustainable development is a major research topic concrete materials science, engineering and technological problems are a major concern. This paper studies resistance to chloride Ion penetration performance and anti-carbonation of low cement concrete sand hill. And combined with the test results analysis and discussion the low dosage of cement to sand concrete electric flux and the influence of carbonization resistance.

Study on the Corrosion Performance of Reinforced Concrete by Using the Seawater Hot Rain Testing Equipment

2013 ◽  
Vol 699 ◽  
pp. 173-178
Author(s):  
Yue Li ◽  
Zhong Wei Gu ◽  
Xian Ming Qin
Keyword(s):  
Reinforced Concrete ◽  
Marine Environment ◽  
Rust Resistance ◽  
Chloride Ion ◽  
Crystalline Material ◽  
Test Results ◽  
Ion Permeability ◽  
Corrosion Performance ◽  
Different Types ◽  
Rust Inhibitor

In order to investigate the corrosion performance of reinforced concrete in the marine environment, the seawater hot rain testing (SHRT) equipment was used to imitate the marine environment and accelerate corrosion rate by circularly spraying seawater to the samples under high temperatures which can attain 70°C. The test results show that SHRT can accelerate the chloride ion permeability which can quickly investigate the corrosion performance of reinforced concrete. Different types of material admixtures have different influences on the corrosion performance of reinforcement concrete, and rust inhibitor and cementitious capillary crystalline material can improve the anti-rust resistance of reinforced concrete effectively.

Effects of Compositions on the Chloride Ion Permeability of Geopolymer Concrete

2012 ◽  
Vol 450-451 ◽  
pp. 428-432
Author(s):  
Qing Wang ◽  
Jing Da ◽  
Cun Bao Zhang ◽  
Zhao Yang Ding ◽  
Zhi Tong Sui
Keyword(s):  
Chloride Ion ◽  
Cementitious Material ◽  
Molar Ratio ◽  
Geopolymer Concrete ◽  
Ion Permeability ◽  
Flux Method ◽  
Molar Ratios ◽  
Electric Flux ◽  
Better Than

The three key oxide molar ratios of geopolymer concrete were studied in this paper: n(SiO2)/n(Al2O3)，n(Na2O)/n(Al2O3) and n(H2O)/n(Na2O). The effect of each oxide molar ratio was assessed by electric flux method. It was found that resistance to chloride ion of geopolymer was increased with increasing n(SiO2)/n(Al2O3).However, there was a limit beyond which this performance improved; it performed better with the increasing of n(Na2O)/n(Al2O3) but worse with the increasing of n(H2O)/n(Na2O). With the same amount of cementitious material, resistance to chloride ion of geopolymer concrete was better than that of common concrete.

The Relationship between Concrete Road Performance and Salt Frost

2013 ◽  
Vol 857 ◽  
pp. 271-276
Author(s):  
Sheng Bo Zhou ◽  
Ai Qin Shen
Keyword(s):  
Abrasion Resistance ◽  
Chloride Ion ◽  
Ion Permeability ◽  
Mixture Ratio ◽  
Tensile Strength Test ◽  
Flexural Tensile Strength ◽  
Chloride Ion Penetration ◽  
Road Performance ◽  
Chlorine Ion ◽  
The Relationship

To carry out frost resistance, resistance to chlorine ion permeability, abrasion resistance and flexural tensile strength test for different mixture ratio of concrete, the influence of salt frost was systematically analyzed on the other concrete road performance. The results show that the salt frost made the decrease of strength of concrete, resistance to chloride ion penetration reduce, but had a little effects on abrasion resistance.

Rheological Property and Durability of High Strength Concrete Using Zeolite Powder and Microsphere

2014 ◽  
Vol 1030-1032 ◽  
pp. 1003-1009
Author(s):  
Yu Xin Gao ◽  
Jia Chao Lin ◽  
Bao Jun Cheng ◽  
Xiong Wu ◽  
Yuan Peng ◽  
...  
Keyword(s):  
Rheological Property ◽  
High Strength Concrete ◽  
Composite Powder ◽  
Chloride Ion ◽  
High Strength ◽  
The Self ◽  
Ion Permeability ◽  
Strength Concrete ◽  
Closest Packing ◽  
Electric Flux

The rheological property of fresh high-strength concrete (HSC) and mechanical properties, self-shrinkage and resistance to chloride ion permeability of hydrated HSC were studied on the basis of the closest packing theory. Results showed that the packing density of composite powder was the highest when the content of microsphere was 30.0%; when the content of zeolite powder added to concrete varied from 0.0% to 4.0%, the rheological and discontinuous property of concrete would be improved and its viscosity would be increased; meanwhile, compared to the standard concrete, the self-shrinkage of concrete with 2.0% zeolite powder at 1d, 3d, 7d and 28d was decreased by 77.1%, 49.6%, 44.0% and 38.1% respectively; finally, the resistance to chloride ion permeability of hydrated HSC with zeolite powder was improved with a result of 18.5% reduction of electric flux at 28d.

scholarly journals A Study on the Evaluation of Chloride-Ion Penetration into the Concretes Under a Marine Environment.

1997 ◽  
pp. 91-104 ◽  
Author(s):  
Teruhiko Sasatani ◽  
Kazuyuki Torii ◽  
Kenichi Sato ◽  
Mitsunori Kawamura
Keyword(s):  
Marine Environment ◽  
Chloride Ion ◽  
Chloride Ion Penetration ◽  
Ion Penetration
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