scholarly journals Opuntia Ficus-Indica (OFI) Mucilage as Corrosion Inhibitor of Steel in CO2-Contaminated Mortar

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1316
Author(s):  
Andrés A. Torres-Acosta ◽  
Paola Y. González-Calderón
Keyword(s):  
Corrosion Inhibitor ◽  
Water Mass ◽  
Construction Materials ◽  
Opuntia Ficus Indica ◽  
Linear Polarization Resistance ◽  
Inhibiting Effect ◽  
Corrosion Rates ◽  
Hazardous Environments ◽  
Cement Based Materials ◽  
Experimental Findings

The present investigation is directed to determine if a natural/botanical addition, from Opuntia ficus-indica (OFI) cactus, increases durability for cement-based materials exposed to CO2-laden environments (urban and industrial). The use of this botanical addition in cement-based material applications has shown good performance when these materials are exposed to chloride-laden environments, but no investigations to date have shown the performance of this addition in urban/industrial environments. Therefore, the aim of this investigation is to complement OFI mucilage performance in the most hazardous environments where most of these construction materials are naturally exposed: marine, urban, and industrial. Steel-reinforced mortar prisms, containing OFI mucilage at different addition levels (0%, 1.5%, 4%, 8%, 42%, and 95%, by water mass replacement concentration), were exposed for 14 years (5110 days) in a natural CO2-laden environment. Linear polarization resistance measurements were performed in a wet–dry cycle (between 5020 and 5110 days of age, after mortar fabrication) to determine the possible corrosion-inhibiting effect of OFI mucilage additions. Little corrosion-induced cracking was observed in carbonated mortars with OFI mucilage additions, compared with the carbonated control mortar that showed high corrosion-induced cracking. The electrochemical results showed corrosion-inhibiting efficiencies for steel in carbonated mortar with OFI mucilage additions of 40–70% for low OFI mucilage concentrations (1.5% and 4%), and 70–90% for medium and high OFI mucilage concentrations (8%, 42%, and 95%). Experimental findings suggest that adding OFI mucilage might be useful as a corrosion inhibitor for steel in carbonated cement-based materials (i.e., mortar) because corrosion rates and cracking initiation/propagation were decreased.

An improved multipurpose field robot for installing construction materials

Robotica ◽  
2010 ◽  
Vol 28 (7) ◽  
pp. 945-957 ◽  
Author(s):  
Seungyeol Lee ◽  
Seungnam Yu ◽  
Seokjong Yu ◽  
Changsoo Han
Keyword(s):  
Force Feedback ◽  
Construction Materials ◽  
Human Robot Interaction ◽  
Work Environments ◽  
National Defense ◽  
Construction Sites ◽  
Robot Interaction ◽  
Hazardous Environments ◽  
Remote Sites ◽  
Field Robot

SUMMARYRecently, there has been a lot of interest concerning remote-controlled robot manipulation in hazardous environments including construction sites, national defense areas, and disaster areas. However, there are problems involving the method of remote control in unstructured work environments such as construction sites. In a previous study, to address these problems, a multipurpose field robot (MFR) system was described. Though the case studies on construction, to which “MFR for installing construction materials” was applied, however, we found some factors to be improved. In this paper, we introduce a prototype of improved multipurpose field robot (IMFR) for construction work. This prototype robot helps a human operator easily install construction materials in remote sites through an upgraded additional module. This module consists of a force feedback joystick and a monitoring device. The human–robot interaction and bilateral communication for strategic control is also described. To evaluate the proposed IMFR, the installation of construction materials was simulated. We simulated the process of installing construction materials, in this case a glass panel. The IMFR was expected to do more accurate work, safely, at construction sites as well as at environmentally hazardous areas that are difficult for humans to approach.

Correlating Corrosion Field Data With Experimental Findings for the Development of Pipeline Mitigation Strategies

2014 ◽  
Author(s):  
Karina Chevil ◽  
Weixing Chen ◽  
Greg Van Boven ◽  
Richard Kania ◽  
Jenny Been
Keyword(s):  
Field Data ◽  
Pipeline Steel ◽  
Experimental Studies ◽  
Mitigation Strategies ◽  
General Corrosion ◽  
Common Phenomenon ◽  
Corrosion Rates ◽  
Report Data ◽  
Anaerobic Corrosion ◽  
Experimental Findings

Coating disbondment on pipelines is a common phenomenon that leads to exposure of the pipeline metal to ground water solutions, promoting a corrosive environment which is associated with stress corrosion cracking (SCC). This investigation aims to understand the corrosion behavior and rate of pipeline steel under coating disbondments of varying sizes based on field data and experimental studies. In the analysis of the field data, dig reports provided by a Canadian gas transportation company were analyzed for cases of anaerobic corrosion under tape coatings. The analyzed field data provided a correlation between the tape coating disbondment size and corrosion rate found under the coating. The experimental studies aimed to understand the field findings. The analyses were performed on X-65 pipeline steel coupons placed in a vertical coupon holder with a PMMA shielding. To imitate the variation in the disbondment size, the gap size between the metal coupons and the shielding was varied (2 mm, 5 mm, and 10 mm, and infinite). The general corrosion rates were obtained through weight loss calculations. The experimental results were compared and correlated with dig-report data from the field for a development of cathodic protection and pipeline mitigation strategies.

Nickel Corrosion Inhibition in Sulfuric Acid—Electrochemical Studies, Morphologies, and Theoretical Approach

CORROSION ◽  
10.5006/0508 ◽  
2012 ◽  
Vol 68 (8) ◽  
pp. 699-712 ◽  
Author(s):  
M.A. Amin ◽  
H. Shokry ◽  
E.M. Mabrouk
Keyword(s):  
Sulfuric Acid ◽  
Electrochemical Impedance ◽  
Theoretical Studies ◽  
Electrochemical Studies ◽  
X Ray ◽  
Linear Polarization Resistance ◽  
Tafel Polarization ◽  
Inhibition Performance ◽  
Experimental Findings ◽  
Good Agreement

The inhibition performance of three selected dihydrazide derivatives, namely, malonic acid (MAD), succinic acid (SAD), and adipic acid (AAD) dihydrazide, was tested in relation to nickel corrosion in 1.0 M sulfuric acid (H2SO4) solution. Electrochemical methods (Tafel polarization, linear polarization resistance [LPR], and electrochemical impedance spectroscopy [EIS]) were used, complemented with scanning electron microscopy/energy-dispersive x-ray (SEM/EDX) examinations. Computational studies were also used to confirm experimental findings and to optimize the adsorption structures of dihydrazide derivatives. Results showed that the three tested dihydrazides inhibited Ni corrosion (mixed-type inhibitors) to an extent, depending on the type and concentration of the introduced inhibitor. SEM studies revealed that the corroded areas on the surface were decreased in the presence of additives to an extent, depending on the type and concentration of the tested inhibitor. Results obtained from electrochemical measurements are in good agreement with theoretical studies.

Computational Calculations, Gravimetrical, and Surface Morphological Investigations of Corrosion Inhibition Effect of Triazole Derivative on Mild Steel in HCl

2020 ◽  
Vol 17 (7) ◽  
pp. 2897-2904
Author(s):  
Shaimaa B. Al-Baghdadi ◽  
Ahmed A. Al-Amiery ◽  
Abdul A. Kadhum ◽  
Mohd Sobri Takriff
Keyword(s):  
Adsorption Isotherm ◽  
Mild Steel ◽  
Corrosion Inhibitor ◽  
Inhibition Efficiency ◽  
The Novel ◽  
Langmuir Adsorption ◽  
Computational Calculations ◽  
Acid Environment ◽  
Experimental Findings ◽  
High Inhibition

The inhibition efficiency of the novel synthesized corrosion inhibitor namely, 5,5’-(1,4-phenylene)bis(3-mercapto-4-methyl-1,2,4-triazole) (PBMMT) have been studied for mild steel in 1 M hydrochloric acid environment by using gravimetric techniques. PBMMT show high inhibition efficiency at 0.5 mM. The adsorption isotherm of the investigated inhibitor on the surface of mild steel obeys Langmuir adsorption isotherm. The surface morphology was tested by scanning electron microscopy (SEM) in the absence and presence of PBMMT as corrosion inhibitor. The results show that the mild steel surface in presence of PBMMT 0.5 mM was smooth and uncorroded in 1 M HCl solution. Quantum chemical calculations were quite fitted with the experimental findings.

Kombinierte experimentelle und numerische Studie zur schwindinduzierten Rissbildung zementgebundener Werkstoffe / Combined Experimental and Numerical Study to assess Shrinkage Cracking of Cement-Based Materials

1998 ◽  
Vol 4 (5) ◽  
pp. 479-506 ◽  
Author(s):  
G. Martinola ◽  
H. Sadouki
Keyword(s):  
Numerical Study ◽  
Decisive Role ◽  
Shrinkage Cracking ◽  
Nonlinear Fracture Mechanics ◽  
Material Parameters ◽  
Nonlinear Fracture ◽  
Cement Based Materials ◽  
Different Types ◽  
Experimental Findings ◽  
Relevant Material

Abstract In this contribution, a combined experimental and numerical study to assess the cracking resistance of cement-based materials subjected to desiccation is outlined. Experimentally, the tendency to hygral cracking is determined by means of mortar ring specimens exposed to drying atmosphere. A numerical model based on the nonlinear theory of diffusion and nonlinear fracture mechanics is developed. The relevant hygral and mechanical parameters and laws needed for the model have been determined by means of adequate experiments analyzed by inverse analyses. The hygro-mechanical behaviour of two different types of mortar is studied. Numerical results have been compared to experimental findings. Furthermore, a parametric study has been carried out with the aim to characterize the relevant material parameters influencing shrinkage cracking. It can be concluded that a combination of experimental and numerical methods can play a decisive role in optimizing mortars or concretes with respect to predefined and required material properties. In this way, the durability of concrete structures can be significantly enhanced.

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