EH-pH- and main element analyses of Blast Furnace Slag Cement paste pore solutions activated with sodium monofluorophosphate – Implications for carbonation and self-healing

Kempl, J.; Çopuroğlu, Oğuzhan

doi:10.1016/j.cemconcomp.2016.05.004

Cited by 14 publications

(5 citation statements)

References 32 publications

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“…Procedure for pore solution extraction from alkali-activated FA/GBFS pastes is adopted from [29]. The pore solutions were pressed out from the pastes (type A sample size with 35 mm diameter and 70 mm height) with a high-pressure apparatus MacBen-type, with an oilhydraulic end-load capacity of 5000 kN and a cylinder assembly with an inner diameter of 34 mm and a height of 115 mm fitting the size of the paste cylinders (A).…”

Section: Pore Solution Composition and Ph Measurementsmentioning

confidence: 99%

Effect of curing conditions on the pore solution and carbonation resistance of alkali-activated fly ash and slag pastes

Nedeljković

Ghiassi

Laan

et al. 2019

Cement and Concrete Research

114

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The effect of curing conditions (sealed and unsealed) on the pore solution composition and carbonation resistance of different binary alkali-activated fly ash (FA) and ground granulated blast furnace slag (GBFS) pastes is investigated in this study. The studied mixtures were with FA/GBFS ratios of 100:0, 70:30; 50:50, 30:70, 0:100. Ordinary Portland cement (OPC) and Cement III/B (70 wt.% of GBFS and 30 wt.% OPC) pastes with the same precursor content were also studied to provide a baseline for comparison. Accelerated carbonation conditions (1% (v/v) CO2, 60% RH for 500 days) were considered for evaluating the carbonation resistance of the pastes.

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Section: Pore Solution Composition and Ph Measurementsmentioning

confidence: 99%

Effect of curing conditions on the pore solution and carbonation resistance of alkali-activated fly ash and slag pastes

Nedeljković

Ghiassi

Laan

et al. 2019

Cement and Concrete Research

114

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“…Figure 10 shows Pourbaix diagrams with the stability fields for phosphoric ions as well as E H −pH values of pore solution of two OPC pastes labelled CEM I and CEM III/B [72]. The use of sodium monofluorophosphate (Na 2 PO 3 F, MFP) dual inhibitor and self-healing agent was found to recover 98.85% and 79.82% of the pH of the carbonated cement pastes compared to the untreated paste for CEM I and CEM III/B, respectively.…”

Section: Introductionmentioning

confidence: 99%

Corrosion Inhibition Mechanism of Steel Reinforcements in Mortar Using Soluble Phosphates: A Critical Review

et al. 2021

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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 inhibitors (ACI). The chemical stability of phosphate corrosion inhibitors depends on the pH of the solution, H2PO4− ions being stable in the pH range of 3–6, the HPO42− in the pH range of 8–12, while the PO43− ions are stable above pH 12. The formation of iron phosphate compounds is a thermodynamically favored spontaneous reaction. Phosphate ions promote ferrous phosphate precipitation due to the higher solubility of ferric phosphate, thus producing a protective barrier layer that hinders corrosion. Therefore, the MFP as well as the DHP and TSP compounds are considered anodic corrosion inhibitors. Both types of application (MCI and ACI) of phosphate corrosion inhibitors found MFP to present the higher inhibition efficiency in the following order MFP > DHP > TSP.

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“…The procedure for pore solution extraction from AAS pastes is adopted from [27]. Pressures of up to 750 MPa were used to extract pore fluid from the samples.…”

Section: Experimental Programmentioning

confidence: 99%

Carbonation Resistance of Alkali-Activated Slag Under Natural and Accelerated Conditions

Nedeljković

Zuo

Arbi

et al. 2018

J. Sustain. Metall.

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In this paper, carbonation resistance of alkali-activated slag (AAS) pastes exposed to natural and accelerated conditions up to 1 year was investigated. Two aspects of carbonation mechanism were evaluated. The first was the potential carbonation of the main binding phases in finely powdered AAS pastes. The second was the reactivity and diffusivity of CO 2 within the bulk AAS paste. From Fourier transform infrared spectroscopy and thermogravimetric analysis coupled with mass spectroscopy time-series measurements, it was found that powdered AAS was largely carbonated within 28 days with a CO 2 uptake of 14 wt%. The main carbonation products were calcium carbonates. Nevertheless, the bulk paste samples were highly resistant to carbonation, regardless of the exposure conditions. The findings showed that the pH value (initial pH [ 12) and strength of the samples did not decrease under accelerated carbonation compared to those of the samples exposed under natural conditions. The mineralogy of the samples in these two carbonation exposures did not alter either, except for outdoor conditions. The gel pores were dominant in the pastes (pore size in range of 2-15 nm). The dense microstructure was the main barrier for CO 2 to diffuse and further react with binding phases.

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EH-pH- and main element analyses of Blast Furnace Slag Cement paste pore solutions activated with sodium monofluorophosphate – Implications for carbonation and self-healing

Cited by 14 publications

References 32 publications

Effect of curing conditions on the pore solution and carbonation resistance of alkali-activated fly ash and slag pastes

Effect of curing conditions on the pore solution and carbonation resistance of alkali-activated fly ash and slag pastes

Corrosion Inhibition Mechanism of Steel Reinforcements in Mortar Using Soluble Phosphates: A Critical Review

Carbonation Resistance of Alkali-Activated Slag Under Natural and Accelerated Conditions

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