Study on Degradation Factor Adsorption Effect by Epoxy Resin with Functional Adsorbent

2020 ◽  
Vol 853 ◽  
pp. 187-192
Author(s):  
Naoki Yokokawa ◽  
Toshihiro Senga ◽  
Tadashi Yamauchi ◽  
Shigeyuki Date
Keyword(s):  
Reinforced Concrete ◽  
Epoxy Resin ◽  
Chloride Ion ◽  
Reinforced Concrete Structures ◽  
Ion Adsorption ◽  
Sulfate Ion ◽  
Adsorption Effect ◽  
Chemical Erosion ◽  
Salt Damage ◽  
Degradation Factor

As a countermeasure against deterioration of reinforced concrete structures that have suffered from salt damage, materials containing salt adsorbents have been developed. In this study, the basic properties of the “Hybrid Epoxy Resin Repair Agent” in which a functional adsorbent was added to an epoxy resin were grasped and verified. As a result, chloride ion adsorption effect assuming repair of salt damage and sulfate ion adsorption effect assuming chemical erosion repair was confirmed.

Use of Thermoplastic Polymer in Mortar Composites to Improve its Chloride Penetration Resistance

2016 ◽  
Vol 22 ◽  
pp. 33-44 ◽  
Author(s):  
M. Omrane ◽  
A.S. Benosman ◽  
M. Mouli ◽  
Y. Senhadji
Keyword(s):  
Reinforced Concrete ◽  
Flexural Strength ◽  
Portland Cement ◽  
Penetration Depth ◽  
Concrete Structures ◽  
Chloride Ion ◽  
Chloride Penetration ◽  
Partial Replacement ◽  
Total Charge ◽  
Reinforced Concrete Structures

This paper presents a study of the resistance to chloride penetration of blended Portland cement mortar containing thermoplastic waste polymer polyethylene terephthalate (TWPET). Composite TWPET-mortars are often presented as the materials of the future in reason of their potential for innovation and advantages that offer. In fact, the use of TWPET percentages as a cement substitution reduces energy costs; address problems related to environmental pollution by CO2 emissions and repairs various reinforced concrete structures. Blended Portland cement (CPJ) is partially replaced with TWPET at the amounts of 2%, 4% and 6% by weight of cementitious materials. Chloride penetration depth of full and partial immersions in 3% NaCl solution, rapid chloride permeability test (RCPT) after 28, 90 and 120 days, sorptivity, leaching test and flexural strength of thermoplastic-mortar composites (TMCs) were determined. Test results reveal that the resistance to chloride penetration of TMCs improves substantially with partial replacement of CPJ with TWPET and without significantly affecting the flexural strength in tap water. The chemical resistance is higher with an increase in the replacement level. So, sorptivity, the chloride ion penetration depth, apparent chloride ion diffusion coefficient, the total charge passed in coulombs and leached depth measurements of the TMCs are much smaller than those of reference mortar. The formations which appear such as different calcium salts were determined by X-ray diffraction. These results take into account the use of waste plastics in the manufacture of mortars modified which can be both recommended for preventing the chloride-induced corrosion of the steel in various reinforced concrete structures and participate greatly in the environment preservation.

New Water-Based Anti-Corrosion Chemical Materials in Engineering Repairing

2011 ◽  
Vol 287-290 ◽  
pp. 249-252
Author(s):  
Wei Chen ◽  
Chao Jun Xiao ◽  
Zhi Jian Xu ◽  
Xian Ning Jiang ◽  
Kai Fu Zhou ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Epoxy Resin ◽  
Environmental Protection ◽  
Concrete Structures ◽  
Raw Material ◽  
Reinforced Concrete Structures ◽  
Concrete Members ◽  
Water Based ◽  
Chemical Materials

The environmental protection water-based grafted whole propyl epoxy resin latex(AOW-201) as a basic raw material of the interface penetrant, waterproof pressure and anti-cracking putty, and anti-corrosion coatings and water-based with rust anti-corrosion paint,that are used for reinforced concrete members repair works.Therefore,that is a type of reinforced concrete structures worthy of restoration works to promote the application of new anti-corrosion chemical materials.

scholarly journals Autonomous Corrosion Assessment of Reinforced Concrete Structures: Feasibility Study

Sensors ◽  
2020 ◽  
Vol 20 (23) ◽  
pp. 6825
Author(s):  
Woubishet Zewdu Taffese ◽  
Ethiopia Nigussie
Keyword(s):  
Reinforced Concrete ◽  
Feasibility Study ◽  
Concrete Structures ◽  
Chloride Ion ◽  
High Sensitivity ◽  
Reinforced Concrete Structures ◽  
Corrosion Condition ◽  
Rc Structures ◽  
Corrosion Assessment ◽  
Use Of Internet

In this work, technological feasibility of autonomous corrosion assessment of reinforced concrete structures is studied. Corrosion of reinforcement bars (rebar), induced by carbonation or chloride penetration, is one of the leading causes for deterioration of concrete structures throughout the globe. Continuous nondestructive in-service monitoring of carbonation through pH and chloride ion (Cl−) concentration in concrete is indispensable for early detection of corrosion and making appropriate decisions, which ultimately make the lifecycle management of RC structures optimal from resources and safety perspectives. Critical state-of-the-art review of pH and Cl− sensors revealed that the majority of the sensors have high sensitivity, reliability, and stability in concrete environment, though the experiments were carried out for relatively short periods. Among the reviewed works, only three attempted to monitor Cl− wirelessly, albeit over a very short range. As part of the feasibility study, this work recommends the use of internet of things (IoT) and machine learning for autonomous corrosion condition assessment of RC structures.

scholarly journals Study on Adsorption Properties of Calcined Mg–Al Hydrotalcite for Sulfate Ion and Chloride Ion in Cement Paste

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 994
Author(s):  
Jun Wang ◽  
Bei Huang ◽  
Zhongyang Mao ◽  
Yu Wang
Keyword(s):  
Mechanical Properties ◽  
Cement Paste ◽  
Chloride Ion ◽  
Chloride Ions ◽  
Mixed Solution ◽  
Sulfate Ion ◽  
Adsorption Effect ◽  
Adsorption Time ◽  
Deformation Properties ◽  
Micro Analysis

In the marine environment, sulfate ions and chloride ions are abundant. Therefore, sulfate attack and chloride ion attack are common failure forms of marine concrete. Mg–Al hydrotalcite is a layered bimetallic hydroxide, which can be used as guest molecular adsorbent. In this experiment, we synthesized Mg–Al hydrotalcite, and the crystal state, surface morphology, and composition of this adsorbent were investigated by modern micro-analysis technology. Mg–Al hydrotalcite was added into the prepared target ion solution, to explore the influence of various factors on the adsorption performance of Mg–Al hydrotalcite, and then calcined Mg–Al hydrotalcite was added into cement paste, to study the mechanical properties and durability of the paste samples. The experimental results show that the optimum conditions for adsorption of chloride ions by calcined Mg–Al hydrotalcite are an adsorption time of 4 h, temperature of 35 °C, LDO (calcined Mg-Al hydrotalcite) dosage of 3.5 g/L, and a pH of 8. The adsorption effect of sulfate ion is best when the adsorption time is 6 h, the temperature is 35 °C, the dosage of LDO is 4 g/L, and the pH = 8. The optimal adsorption conditions of calcined Mg–Al hydrotalcite for chloride ion and sulfate ion are not completely the same, and the adsorption of these two ions in mixed solution shows competitive adsorption. Compared with the common paste specimens without Mg–Al hydrotalcite, the mechanical properties and deformation properties of cement specimens can be significantly improved by adding Mg–Al hydrotalcite.

scholarly journals Mechanism analysis and model calculation of chloride ion diffusion in reinforced concrete structure

2020 ◽  
Vol 198 ◽  
pp. 01035
Author(s):  
Faqiang Yu ◽  
Weiwei Gao ◽  
Wenchao Liu
Keyword(s):  
Reinforced Concrete ◽  
Diffusion Mechanism ◽  
Concrete Structures ◽  
Chloride Concentration ◽  
Chloride Ion ◽  
Chloride Ions ◽  
Cumulative Distribution ◽  
Reinforced Concrete Structures ◽  
Mechanism Analysis ◽  
Reinforced Concrete Structure

Chloride-induced corrosion of steel in reinforced concrete structures is one of the major causes of their deterioration over time. The analysis and research on the diffusion mechanism of chloride ions in reinforced concrete structures is still insufficient, and it is necessary to calculate the path of chloride ions based on theoretical models. In this paper, the fick’s second law was used to describe the free chloride concentration evolution in concrete. The Monte Carlo simulation was used to predict the cumulative distribution of corrosion initiation of reinforcing steel.The results show that the calculated results of the established model are in good agreement with the measured results.

Examining the Effect of Asphalt Plant Surplus Filler on Water and Chloride Ion Permeability of Cement Mortar

2018 ◽  
Vol 765 ◽  
pp. 383-390
Author(s):  
Hadi Vafaeinejad ◽  
Mahdi Kioumarsi
Keyword(s):  
Electrical Resistivity ◽  
Reinforced Concrete ◽  
Electrical Resistance ◽  
Cement Mortar ◽  
Concrete Structures ◽  
Chloride Ion ◽  
Partial Replacement ◽  
Reinforced Concrete Structures ◽  
Ion Permeability ◽  
Chloride Ion Penetration

The penetration of water and chloride ion into the concrete is of factors that cause rust and corrosion in rebars by reaching the existing reinforcement surface in reinforced concrete structures. In this study, effect of using Asphalt Plant Surplus Filler as a partial replacement of cement with replacement values of 0, 5, 10, 15 and 20% on permeability and electrical resistance of cement mortar were investigated with the aim of decreasing cement consumption. In order to determine the penetration of water, 10 cubic specimens with the size of 150 mm were made and tested. In order to determine chloride ion penetration, 20 cylindrical specimens with a length of 50 and a diameter of 100 mm were studied at the ages of 28 and 56 days. To test the electrical resistivity of cement mortar, 30 cubic specimens with the size of 100 mm were tested at the ages of 7, 28 and 56 days. According to the results of the experiments, adding filler to the cement mortar enhances the penetration of water and chloride ion. Electrical resistivity generally increases with the increase of specimen age. Furthermore, the filler increment indicates the reduction of electrical resistivity.

Improvement of Concrete Durability by Composite Cement

2009 ◽  
Vol 405-406 ◽  
pp. 14-18 ◽  
Author(s):  
Nai Qian Feng ◽  
Quan Lin Niu ◽  
Chong Zhi Li
Keyword(s):  
Reinforced Concrete ◽  
Fly Ash ◽  
Natural Zeolite ◽  
Composite Powder ◽  
Concrete Structures ◽  
Chloride Ion ◽  
Reinforced Concrete Structures ◽  
Concrete Durability ◽  
Positive Role ◽  
Composite Cement

Mineral powders play positive role in improving the durability of concrete subjected to alkaline and saline corrosion, where sulphate ion and chloride ion coexisted may cause serious deterioration to the reinforced concrete structures. Metakaolin, slag, fly ash and natural zeolite mixed in appropriate proportion were tested in inhibiting the deterioration. It is found that the composite powder might decreased AAR and the charge passed of concrete effectively，the while the 7d and 28d strength of cement and concrete are improved as well.

Review of Durability of Fiber Reinforced Polymer (FRP) Reinforced Concrete Structure

2014 ◽  
Vol 548-549 ◽  
pp. 1651-1654 ◽  
Author(s):  
Yao Hong Huang ◽  
Yong Chang Guo
Keyword(s):  
Reinforced Concrete ◽  
Epoxy Resin ◽  
Concrete Structure ◽  
Concrete Structures ◽  
Fiber Reinforced Polymer ◽  
Reinforced Concrete Structures ◽  
Fiber Reinforced ◽  
Reinforced Concrete Structure ◽  
Reinforced Polymer ◽  
Research Situation

With the wide application of FRP reinforced concrete structure, the durability of FRP reinforced concrete structure causing more and more attention . This paper introduce domestic and foreign research situation of durability of FRP reinforced concrete structure in three aspects including FRP material, epoxy resin and FRP reinforced concrete structures .

Numerical Analysis of the 2-Dimensional Diffusion Models of Choride Ions Based on the FDM with Alternating Direction Implicit Schemes

2014 ◽  
Vol 1020 ◽  
pp. 92-97
Author(s):  
Fei Hou ◽  
Yu Bai ◽  
Jun Dong
Keyword(s):  
Reinforced Concrete ◽  
Concrete Structures ◽  
Chloride Ion ◽  
Chloride Diffusion ◽  
Reinforced Concrete Structures ◽  
Two Dimensional ◽  
Ion Diffusion ◽  
Infinite Body ◽  
Diffusion Behavior ◽  
Coefficient Of Diffusion

Chloride ion etching is a significant reason for the damage of the reinforced concrete structures. Diffusion effect is considered to be the main form of which the chloride ion invades into the reinforced concrete structures. Assuming infinite diffusion medium, based on the Chlorine ion diffusion equation, and accounting for the effects of temperature and moisture, models of chloride diffusion in two-dimensional infinite body with consistent coefficient of diffusion and different coefficient of diffusion in both directions are formulated .Two-dimensional chloride ion diffusion behavior was simulated, which proved the diffusion coefficient has a larger effect on the diffusion behavior of the chloride ion. Through these comparisons, we can analysis that model with different coefficient of diffusion in both directions is more suitable for the actual conditions.

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