Diffusion of chloride ion in coral aggregate seawater concrete under marine environment

2021 ◽  
Vol 284 ◽  
pp. 122821
Author(s):  
Gang Wang ◽  
Qing Wu ◽  
Hao Zhou ◽  
Chen Peng ◽  
Wei Chen
Keyword(s):  
Marine Environment ◽  
Chloride Ion

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

Research on FRP-Reinforced Concrete Exposure Test

2011 ◽  
Vol 250-253 ◽  
pp. 1177-1182 ◽  
Author(s):  
Ye Fan Chen ◽  
Chao He Chen ◽  
Hong Wang ◽  
Chuan Min Zhang
Keyword(s):  
Reinforced Concrete ◽  
Marine Environment ◽  
Chloride Ion ◽  
Ultimate Capacity ◽  
Endurance Test ◽  
Ion Content ◽  
Exposure Test ◽  
The Real ◽  
Different Depths ◽  
Selected Location

The paper makes an analysis of the selected location and feasibility of the exposure test ground in the real marine environment, and the endurance test of the FRP- reinforced concrete built-up beam has been carried out on the exposure test ground. After 6 month and 12 month’s exposure test, the beams' mechanic performance and the chloride ion content in different depths have been determined. The results show that after the exposure test, the beams' ultimate capacity has been greatly decreased to a certain extent, and the FRP board can effectively prevent chloride from penetrating.

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.

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.

scholarly journals Utilization of Industrial Waste in Cement in a Marine Environment with a Tropical Climate

2019 ◽  
Vol 7 (8) ◽  
pp. 245 ◽  
Author(s):  
Thi Chu ◽  
Jinhai Zheng ◽  
Da Chen ◽  
Thi Nguyen ◽  
Elsafi Elbashiry ◽  
...  
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
Cement Paste ◽  
Marine Environment ◽  
Industrial Waste ◽  
Building Materials ◽  
Rapid Development ◽  
Chloride Ion ◽  
Tropical Climate ◽  
Test Results

This novel study on cement paste material was conducted with the aim of keeping up with the rapid development of urban construction and contributing to the continuous improvement of building materials to overcome environmental issues. In this study, several kinds of industrial waste were used to enhance the properties of cement paste for application in a marine environment with a tropical climate, such as in Vietnam. This study focuses on evaluating the properties of cement paste containing cement replacement combining 0–30% fly ash, 0–10% silica fume, and plasticizer accounting for 0.3% and 0.4% of the binder by mass. Water demand, chloride ion and sulfate ion permeability, and microstructural properties of the cement paste were determined by thermogravimetric analysis (TGA), X-ray diffraction (XRD), and scanning electron microscope (SEM) and they were investigated after 28 and 56 days. The test results show that an optimum mixture could be obtained with the use of 20% fly ash, 10% silica fume (replacing Portland cement), and 0.4% plasticizer. The application of such materials to sea dikes affected by a tropical climate (characterized by heat, humidity, salty seawater, many big storms, large waves, and strong tides) was investigated for four years on the Vietnamese coast. The test results indicate that fly ash and silica fume can improve the corrosion and abrasion resistance of concrete in coastal areas with a tropical climate, such as in Vietnam.

Experimental Study on Influence of Bending Load on Chloride Ion Concentration of Concrete in Marine Environment

2014 ◽  
Vol 919-921 ◽  
pp. 460-464
Author(s):  
Han Yang Jin ◽  
Hua Xia Zhuang ◽  
Ru Tai Liu ◽  
Jia Le Shi ◽  
Jun Zhi Zhang
Keyword(s):  
Marine Environment ◽  
Concrete Beams ◽  
Chloride Ion ◽  
Load Level ◽  
Ion Concentration ◽  
Tension Zone ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Free Chloride ◽  
Bending Load

This paper mainly determined free chloride ion concentration of concrete beams of two kinds of water cement ratio (0.45and0.60) and bending load (0.00Fmax, 0.30Fmax, 0.45Fmax and 0.60Fmax) after 240 d in marine environment and compared the effect of different load conditions in the same water cement ratio on the free chloride ion concentration. The results show that the concentration of free chloride ion in tension zone of concrete increases with the increase of load level, the concentration of free chloride ion in compressed zone of concrete decreases with the increase of load level; under the same bending load level, the concentration of free chloride ion in concrete increases with water cement ratio.

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.

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