Precipitation mechanism of soluble phosphates in mortar

Published on Oct 3, 2019in European Journal of Environmental and Civil Engineering2.516
· DOI :10.1080/19648189.2017.1363663
Maria Criado27
Estimated H-index: 27
(University of Sheffield),
David M. Bastidas2
Estimated H-index: 2
(CSIC: Spanish National Research Council)
+ 2 AuthorsJ. M. Bastidas33
Estimated H-index: 33
(CSIC: Spanish National Research Council)
Sources
Abstract
AbstractThe penetration of three phosphate compounds in mortar bulk matrix, sodium monofluorophosphate (Na2FPO3) (MFP), disodium hydrogen phosphate (Na2HPO4) (DHP) and trisodium phosphate (Na3PO4) ...
📖 Papers frequently viewed together
References11
Newest
#1David M. Bastidas (CSIC: Spanish National Research Council)H-Index: 22
#2Maria Criado (CSIC: Spanish National Research Council)H-Index: 27
Last. J. M. Bastidas (CSIC: Spanish National Research Council)H-Index: 33
view all 5 authors...
A study was performed on the corrosion-inhibition mechanism of three phosphate compounds (sodium monofluorophosphate, disodium hydrogen phosphate and trisodium phosphate) for steel rebars embedded in ordinary Portland cement (OPC) mortar exposed to 3% NaCl solutions. The corrosion inhibitors were deployed in two different ways: by migration after the curing period, through the immersion of mortar specimens in aqueous solutions containing the soluble phosphates; and by initial admixture of the ph...
Source
#2Weifeng Sun (SEU: Southeast University)H-Index: 19
Abstract The influence of phosphate as a corrosion inhibitor on the corrosion behavior of as-received and pre-rusted reinforcing steels in mortar specimens was investigated after 360 days exposure in 3.5% NaCl solution. This involved the use of electrochemical techniques for studying the steel surface reactions and microscopic observations of the steel–mortar interface. The electrochemical methods, including electrochemical impedance spectroscopy (EIS) and measurements of corrosion potential ( E...
Source
#1David M. Bastidas (CSIC: Spanish National Research Council)H-Index: 22
#2Maria Criado (CSIC: Spanish National Research Council)H-Index: 27
Last. J. M. Bastidas (CSIC: Spanish National Research Council)H-Index: 33
view all 6 authors...
A comparative study was performed on the inhibition of steel reinforcement corrosion using three soluble phosphates: sodium monofluorophosphate (Na2PO3F), disodium hydrogen phosphate (Na2HPO4) and trisodium phosphate (Na3PO4). Tests were carried out using ordinary Portland cement (OPC) paste specimens and OPC mortar specimens with embedded steel reinforcements. The corrosion inhibitors were deployed in two different ways: by immersion of OPC specimens in aqueous solutions containing the soluble ...
Source
#1A. La Iglesia (CSIC: Spanish National Research Council)H-Index: 12
#2V.M. La Iglesia (CSIC: Spanish National Research Council)H-Index: 6
Last. J. M. Bastidas (CSIC: Spanish National Research Council)H-Index: 33
view all 5 authors...
Abstract The chemical products generated in the reaction between sodium monofluorophosphate and cement paste, simulated by a calcium hydroxide solution, were analysed using X-ray diffraction and transmission electron microscopy with energy dispersive X-ray analysis. Portlandite, apatite, fluorite, calcite and amorphous products were identified as the main synthesized phases. Nanoparticles of hydroxyfluoroapatite (Ca5(PO4)3(OH,F)) were also profiled. In a medium of high alkalinity such as the tes...
Source
#1David M. Bastidas (CSIC: Spanish National Research Council)H-Index: 22
#2V.M. La Iglesia (CSIC: Spanish National Research Council)H-Index: 6
Last. J. M. Bastidas (CSIC: Spanish National Research Council)H-Index: 33
view all 6 authors...
Abstract The entrapment ability of phosphates containing OH − , such as hydroxyapatite (HAP) (Ca 5 (PO 4 ) 3 (OH)), was investigated as a means for chloride removal from a concrete pore network solution. The chloride uptake by HAP was found to be very low, of the order of 32–44 ppm after 28 days immersion in a 0.5 M sodium chloride (NaCl) solution at pH 9. A thermodynamic study was performed on the chemical equilibrium of HAP, whitlockite (Ca 3 (PO 4 ) 2 ), and hilgenstockite (Ca 4 O(PO 4 ) 2 ),...
Source
#1Florica Simescu (INSA Lyon: Institut national des sciences Appliquées de Lyon)H-Index: 3
#2Hassane Idrissi (INSA Lyon: Institut national des sciences Appliquées de Lyon)H-Index: 16
Abstract The present work evaluated the ability of zinc phosphate coating, obtained by cathodic electrochemical treatment, to protect mild steel rebar against the localized attack generated by chloride ions in alkaline medium. The corrosion behaviour of coated steel was assessed by open circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy. The chemical composition and the morphology of the coated surfaces were evaluated by X-ray diffraction and scanning elec...
Source
#1T.A. SöylevH-Index: 5
#2Mark G. Richardson (UCD: University College Dublin)H-Index: 16
Abstract This state-of-the-art report is focused on corrosion inhibitors used in concrete and is based on published studies in the last decade. Emphasis was given to the most commonly used inhibitors such as aminoalcohols (AMAs), calcium nitrites (CN) and sodium monofluorophosphates (MFPs). The report presents information related to (a) basic mechanism study, which gives information about the mechanism of protection provided by inhibitors, (b) effectiveness of inhibitors against corrosion in chl...
Source
#1T.A. SöylevH-Index: 5
#2Ciaran McNally (UCD: University College Dublin)H-Index: 17
Last. Mark G. Richardson (UCD: University College Dublin)H-Index: 16
view all 3 authors...
Abstract The influence of a new organic surface-applied corrosion inhibitor (SACI) on selected concrete properties is studied including compressive strength, tensile strength, steel–concrete bond strength, permeability, drying shrinkage, and freeze–thaw resistance. The inhibitor is an aminoalcohol-based (AMA) corrosion inhibitor and it is applied on the hardened concrete surface. The results show that the inhibitor can be used safely and it does not have any significant harmful effect on the pro...
Source
#1Thierry ChaussadentH-Index: 16
Last. Christian Fiaud (ENSCP: Chimie ParisTech)H-Index: 3
view all 5 authors...
Abstract Among the array of protection and repair methods for reinforced concrete structures when steel reinforcements undergo corrosion, the use of migrating corrosion inhibitors could prove to be an attractive alternative. These products, applied to the concrete surface, are intended to diffuse into the concrete in order to reach the reinforcement and stop or delay corrosion. Some key aspects on the use of monofluorophosphate (MFP) as an inhibitor for concrete reinforcements are presented firs...
Source
#1Oladis de Rincón (University of Zulia)H-Index: 8
#2Orlando Pérez (University of Zulia)H-Index: 2
Last. Isabel Sandoval (University of Zulia)H-Index: 1
view all 6 authors...
Abstract This paper compares the action of ZnO with Ca(NO2)2, examines the effect of the w/c ratio on the performance of both inhibitors and how they affect the physical–chemical properties of concrete. To study that effect, 244 probes were prepared with tap water and water from Maracaibo lake (≅3000 ppm Cl−), and exposed to saline environment for more than two years. Water/cement ratios were 0.45, 0.5 and 0.6, with inhibitor concentrations of 2%, 3% and 4% and a mixture of both at 2%, all by ce...
Source
Cited By1
Newest
#1David M. Bastidas (University of Akron)H-Index: 22
#2Ulises Martin (University of Akron)H-Index: 4
Last. Jacob Ress (University of Akron)H-Index: 5
view all 4 authors...
The corrosion inhibition mechanism of soluble phosphates on steel reinforcement embedded in mortar fabricated with ordinary Portland cement (OPC) are reviewed. This review focuses soluble phosphate compounds, sodium monofluorophosphate (Na2PO3F) (MFP), disodium hydrogen phosphate (Na2HPO4) (DHP) and trisodium phosphate (Na3PO4) (TSP), embedded in mortar. Phosphate corrosion inhibitors have been deployed in two different ways, as migrating corrosion inhibitors (MCI), or as admixed corrosion inhib...
Source
#1Jacob RessH-Index: 5
#2Ulises MartinH-Index: 4
Last. David M. BastidasH-Index: 22
view all 4 authors...
Herein, pH sensitive microcapsules containing NaNO2 corrosion inhibitors for protection of steel reinforced concrete were synthesized via water-in-oil-in-water (W/O/W) double emulsion using colopho...
Source
This website uses cookies.
We use cookies to improve your online experience. By continuing to use our website we assume you agree to the placement of these cookies.
To learn more, you can find in our Privacy Policy.