Impact of the coupled substitution of CaCO3 and CaSO4·2H2O on chloride binding behavior in hydrated C3A pastes

Guo, Muxing; Xiao, Jia; Wang, Jialei

doi:10.1016/j.conbuildmat.2019.05.111

Cited by 10 publications

(4 citation statements)

References 45 publications

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“…The diffraction peak of strätlingite is obvious in sample C after curing for 90 days. It should be noted that a small diffraction peak of Friedel's salt appears around 11.2 • within 3 days in C-2, which indicates that chloride ions had been mixed into the paste and chemically combined with AFm phase [42]. The XRD patterns of CSA cement mixed with CaCO 3, or gypsum are shown in Figure 7.…”

Section: X-ray Diffraction Analyses and Phasequantitative Analyze By ...mentioning

confidence: 98%

Hydration and Mechanical Properties of Calcium Sulphoaluminate Cement Containing Calcium Carbonate and Gypsum under NaCl Solutions

et al. 2022

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Hydration characteristics and mechanical properties of calcium sulphoaluminate (CSA) cement with different contents of CaCO3 and gypsum under NaCl solutions were studied, using the testing methods of isothermal calorimetry, X-ray diffraction (XRD), mercury intrusion porosimetry (MIP), linear shrinkage, and compressive strength. Results show that CaCO3 can promote hydration and reduce the hydration heat of CSA cement. The reaction between gypsum and C4A3S(_) releases a large quantity of heat in the initial hydration period; however, over 3 days of accumulation, the level of hydration heat is reduced. Under NaCl solutions, the aluminate phase has difficulty reacting with CaCO3 to form carbonate phase but combines with chloride ions to form Friedel’s salt. On the contrary, gypsum reduces aluminate phase, and the content of Friedel’s salt is also reduced. Furthermore, CaCO3 and gypsum both increase the total porosity of the CSA cement paste under NaCl solutions during the early curing phase, and over the long-term, pore structure is also optimized. CaCO3 and gypsum reduce the linear shrinkage of CSA cement paste under NaCl solutions. Overall, the compressive strength of CSA cement is reduced with the addition of CaCO3, and the trend will be sharper with the increase in CaCO3. However, when it comes to gypsum, the compressive strength is almost the same during early curing, but in the long-term, compressive strength improves. Essentially, the compressive strength of CSA cement mortar with CaCO3 and gypsum will improve under NaCl solutions.

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Section: X-ray Diffraction Analyses and Phasequantitative Analyze By ...mentioning

confidence: 98%

Hydration and Mechanical Properties of Calcium Sulphoaluminate Cement Containing Calcium Carbonate and Gypsum under NaCl Solutions

et al. 2022

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“…These interactions depend on the CaCO 3 size particles. Guo et al [79] recently reported that C 3 A hydrated (e.g., 3CaO.Al 2 O 3 .6H 2 O) reacts with both chloride ions and CaCO 3 acidifying local limited cement paste and the chloride binding capacity decreased [79][80][81]. This can be simplified by Equations ( 3) and (4) (not stoichiometric balanced), respectively [79]:…”

Section: Eis Analyses: Corrosion Performance Among Distinctive Concre...mentioning

confidence: 99%

“…Guo et al [79] recently reported that C3A hydrated (e.g., 3CaO.Al2O3.6H2O) reacts with both chloride ions and CaCO3 acidifying local limited cement paste and the chloride binding capacity decreased [79][80][81]. This can be simplified by Equations ( 3) and ( 4) (not stoichiometric balanced), respectively [79]: In this initial stage, the CaCO 3 content modifies pH-neighboring rebar and different species to constitute the double layer are formed. With this, a passivation and resistance to chloride penetration is provided [79].…”

Section: Eis Analyses: Corrosion Performance Among Distinctive Concre...mentioning

confidence: 99%

“…This can be simplified by Equations ( 3) and ( 4) (not stoichiometric balanced), respectively [79]: In this initial stage, the CaCO 3 content modifies pH-neighboring rebar and different species to constitute the double layer are formed. With this, a passivation and resistance to chloride penetration is provided [79]. Considering a simplified Fe/water Pourbaix diagram, the corrosion and passivation domains corresponding to the CC sample and the SAND and the CEM samples were relatively different when compared.…”

Section: Eis Analyses: Corrosion Performance Among Distinctive Concre...mentioning

confidence: 99%

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EIS Investigation of the Corrosion Behavior of Steel Bars Embedded into Modified Concretes with Eggshell Contents

Meyer

Menezes

Bonatti

et al. 2022

Metals

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This investigation is focused on evaluation of the corrosion behavior of embedded steel bars (SB) into concretes. Conventional and modified concretes with eggshell are prepared. Although the effect of calcium carbonate on mechanical behavior is recognized and reported, their effects as eggshell (ES) particles replacing portions of sand and cement contents are reasonably scarce. Corrosion behavior is evaluated by electrochemical impedance spectroscopy (EIS) and the potentiodynamic polarization technique. Equivalent circuit and porous electrode behavior are also considered. The novelty concerns a promising use of concrete with ES content to maintain corrosion resistance concatenated with reasonable structural properties. For this purpose, three distinct concrete mixtures are proposed, i.e., a reference and two modified concretes. One replaces 10 wt.% with cement and another 10 wt.% with sand content. It is found that porous electrode behavior helps to predict the corrosion mechanism. Finer ES particles in concrete mixture provides a rapidly passivation on rebar. This reflects positively in corrosion current density after long-term immersion. Additionally, an environmentally friendly aspect associated with economical factor constitutes a promise use of the concrete.

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Effect of Nanoparticle-Incorporated Cementitious Coating on the Corrosion Resistance of Rebars in Chloride Medium

Sofia,

Vanithakumari,

Philip

2023

J. of Materi Eng and Perform

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Impact of the coupled substitution of CaCO3 and CaSO4·2H2O on chloride binding behavior in hydrated C3A pastes

Cited by 10 publications

References 45 publications

Hydration and Mechanical Properties of Calcium Sulphoaluminate Cement Containing Calcium Carbonate and Gypsum under NaCl Solutions

Hydration and Mechanical Properties of Calcium Sulphoaluminate Cement Containing Calcium Carbonate and Gypsum under NaCl Solutions

EIS Investigation of the Corrosion Behavior of Steel Bars Embedded into Modified Concretes with Eggshell Contents

Effect of Nanoparticle-Incorporated Cementitious Coating on the Corrosion Resistance of Rebars in Chloride Medium

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