Insight into the Fabrication of ZnAl Layered Double Hydroxides Intercalated with Organic Anions and Their Corrosion Protection of Steel Reinforced Concrete

2019 ◽  
Vol 166 (16) ◽  
pp. C617-C623 ◽  
Author(s):  
Yanhui Cao ◽  
Dajiang Zheng ◽  
Jingsong Luo ◽  
Fan Zhang ◽  
Shigang Dong ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Corrosion Protection ◽  
Layered Double Hydroxides ◽  
Organic Anions ◽  
Steel Reinforced Concrete ◽  
Double Hydroxides ◽  
Insight Into

scholarly journals Corrosion protection of reinforcing steel reinforced concrete structures of transport structures

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Alexander Bulkov ◽  
Michail Baev ◽  
Igor Ovchinnikov
Keyword(s):  
Reinforced Concrete ◽  
Corrosion Protection ◽  
Concrete Structures ◽  
Steel Corrosion ◽  
High Strength ◽  
Curing Temperature ◽  
Reinforced Concrete Structures ◽  
Reinforcing Steel ◽  
Steel Reinforced Concrete ◽  
Advantages And Disadvantages

The influence of reinforcing steel corrosion on the durability of reinforced concrete structures of transport structures and the degree of knowledge of this problem is considered. It is specified that the protection of reinforcing steel from corrosion is not able to completely replace the correct design and use of high-strength concrete. But it is able to extend the life of reinforced concrete structures. It is noted that corrosion of the reinforcement leads to a decrease in the structural strength due to wear and tear and by a third of the period of operation of reinforced concrete structures, as a result of which transport structures collapse. As an example of the detrimental effect of corrosion of reinforcing steel on the durability of transport structures, examples of accidents of bridges and overpasses caused by this type of corrosion are given. As a result, a conclusion is drawn on the advisability of ensuring a sufficient level of corrosion protection of reinforcing steel to achieve the required durability of reinforced concrete structures of transport structures. The types and causes of corrosion processes in reinforcing steel reinforced concrete structures are described. The compositions and technologies of anticorrosive protection are examined and analyzed. Comparison of the compositions of anticorrosive protection of reinforced concrete structures is carried out according to the following criteria: consumption, density, viability, curing temperature and the number of components of the composition. A comparison of anti-corrosion protection technologies is carried out on the basis of the following indicators: line dimensions, productivity and consumption of energy resources. A comparison is also made of the cost of using various anti-corrosion protection technologies. Based on the data obtained, the advantages and disadvantages of the considered compositions and technologies of corrosion protection are determined. As a result, the most effective and technologically advanced method of corrosion protection of steel reinforcement of reinforced concrete structures of transport structures is selected.

scholarly journals Structural insight into the photoinduced E→Z isomerisation of cinnamate embedded in ZnAl and MgAl layered double hydroxides

2020 ◽  
Vol 1219 ◽  
pp. 128561
Author(s):  
Zita Timár ◽  
Gábor Varga ◽  
Márton Szabados ◽  
Krisztián Csankó ◽  
Tünde Alapi ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
Structural Insight ◽  
Double Hydroxides ◽  
Insight Into

Insight into the adsorption mechanisms of aqueous hexavalent chromium by EDTA intercalated layered double hydroxides: XRD, FTIR, XPS, and zeta potential studies

2019 ◽  
Vol 43 (40) ◽  
pp. 15915-15923 ◽  
Author(s):  
Jing Li ◽  
Liangguo Yan ◽  
Yanting Yang ◽  
Xue Zhang ◽  
Rixin Zhu ◽  
...  
Keyword(s):  
Zeta Potential ◽  
Hexavalent Chromium ◽  
Layered Double Hydroxides ◽  
Batch Experiments ◽  
Adsorption Mechanisms ◽  
Adsorption Performance ◽  
Magnetic Product ◽  
Double Hydroxides ◽  
Insight Into

To understand the possible mechanisms of Cr(vi) adsorption on the surface of modified LDHs, we synthesized EDTA intercalated MgAl-LDH and its magnetic product, and evaluated their adsorption performance for Cr(vi) by batch experiments.

scholarly journals Numerical and Experimental Analysis of Self‐Protection in Reinforced Concrete due to Application of Mg–Al–NO 2 Layered Double Hydroxides

2020 ◽  
Vol 22 (11) ◽  
pp. 2000398 ◽  
Author(s):  
Zahid Mohammad Mir ◽  
Alexandre Bastos ◽  
Celestino Gomes ◽  
Urs Mueller ◽  
Maria Cruz Alonso ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Layered Double Hydroxides ◽  
Experimental Analysis ◽  
Double Hydroxides ◽  
Self Protection

scholarly journals Effect of Chain Length and Functional Group of Organic Anions on the Retention Ability of MgAl- Layered Double Hydroxides for Chlorinated Organic Solvents

2019 ◽  
Vol 3 (4) ◽  
pp. 89 ◽  
Author(s):  
Karen Maria Dietmann ◽  
Tobias Linke ◽  
Raquel Trujillano ◽  
Vicente Rives
Keyword(s):  
Chain Length ◽  
Organic Solvents ◽  
Layered Double Hydroxides ◽  
Functional Group ◽  
Interlayer Space ◽  
Organic Anions ◽  
Batch Experiments ◽  
Swelling Properties ◽  
Chlorinated Organic ◽  
Double Hydroxides

Nowadays, the contamination of groundwater and soils by chlorinated organic solvents is a severe and worldwide problem. Due to their swelling properties, Layered Double Hydroxides (LDHs) are potentially excellent compounds to retain chlorinated organic solvents from aquifers. By intercalating organic anions, the polarity of the interlayer space can be changed from hydrophilic to hydrophobic, enhancing the adsorption of chloro-organic molecules onto the alkyl chains of intercalated organic anions. In this study, organically modified LDHs were synthesized and their efficiency was tested in batch experiments with three different chlorinated organic solvents, namely trichloroethylene, 1,1,2-trichloroethane and trichloromethane (chloroform), to examine the influence of the chain length and the functional group of the intercalated organic anion upon the retention ability of a LDH due to different electronic interactions and different sizes of the interlayer space. All synthesized and used samples were characterized using powder X-ray diffraction, thermal analysis coupled with mass spectrometry and Fourier-transform infrared spectroscopy; freshly synthesized materials were additionally analyzed regarding their particle size distribution and specific surface area. Results of the batch experiments showed that only LDHs with intercalated long-chain organic anions could be efficient adsorbents for the removal of chlorinated organic solvents from contaminated water. A selective efficiency towards 1,1,2-trichloroethane and trichloromethane can be proposed for these reactants.

Ce-substituted Mg-Al layered double hydroxides to prolong the corrosion protection lifetime of aluminium alloys

2021 ◽  
pp. 151527
Author(s):  
Daniel E. L. Vieira ◽  
Andrei N. Salak ◽  
Mário G. S. Ferreira ◽  
Joaquim M. Vieira ◽  
Christopher M. A. Brett
Keyword(s):  
Corrosion Protection ◽  
Layered Double Hydroxides ◽  
Aluminium Alloys ◽  
Double Hydroxides

scholarly journals Polyelectrolyte-modified layered double hydroxide nanocontainers as vehicles for combined inhibitors

RSC Advances ◽  
2015 ◽  
Vol 5 (50) ◽  
pp. 39916-39929 ◽  
Author(s):  
Jorge Carneiro ◽  
Ana F. Caetano ◽  
Alena Kuznetsova ◽  
Frederico Maia ◽  
Andrei N. Salak ◽  
...  
Keyword(s):  
Corrosion Protection ◽  
Layered Double Hydroxide ◽  
Layered Double Hydroxides ◽  
Layer By Layer ◽  
Dual Release ◽  
Double Hydroxide ◽  
Double Hydroxides

The dual release of Ce3+ and 2-mercaptobenzothiazole from layered double hydroxides modified by the layer-by-layer leads to an improvement of corrosion protection when compared to unmodified layered double hydroxides.

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