Leaching of CEM III paste by demineralised or mineralised water at pH 7 in relation with aluminium release in drinking water network

Berthomier, M.; Lors, Christine; Damidot, D.; Larrard, Thomas de; Guerandel, Cyril; Bertron, Alexandra

doi:10.1016/j.cemconres.2021.106399

Cited by 6 publications

(5 citation statements)

References 40 publications

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“…5 allows to compare the degree of leaching of the geopolymer pastes (MK_Na, MK_K, MI_Na and MI_K). In the present paper, the leaching coefficients were calculated according to [41,42] and considering the total volume of samples submerged in the sulfuric acid solution and thus, the initial molar concentrations of Si, Al, Ca, Fe, Na, K, Mg and Ti present in the solid fraction of the geopolymers (cf. Table 1) as well as the additional Si, K, and Na amount coming from the activators (cf.…”

Section: Chemical Evolution Of the Immersion Solutionmentioning

confidence: 99%

See 1 more Smart Citation

Behavior of calcined clay based geopolymers under sulfuric acid attack: Meta-illite and metakaolin

Caselles

Balsamo

Benavent

et al. 2023

Construction and Building Materials

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Section: Chemical Evolution Of the Immersion Solutionmentioning

confidence: 99%

“…3). To compare the leaching degree of geopolymers, total leaching coefficients (Lc) were calculated according to [41,42] and presented in Table 7. Lc values are relative to the initial volume of samples, which was about 0.21 L per formulation, which explains the low values of the coefficients determined per leached element and per formulation.…”

Section: 2mentioning

confidence: 99%

Behavior of calcined clay based geopolymers under sulfuric acid attack: Meta-illite and metakaolin

Caselles

Balsamo

Benavent

et al. 2023

Construction and Building Materials

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“…Many numerical and experimental studies have focused on leaching by demineralised water or acid attack [4][5][6][7][8]. However, degradation by mineral water still requires efforts for a better understanding of the physicochemical phenomena at stake [9,10], as ion leaching kinetics may be particularly complex [11]. In recent years, concrete tank deterioration has been observed in several drinking water treatment plants.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation on the Effects of Mineral Water Composition on the Leaching of Cement-Based Materials

Pouyanne,

Boudache,

Hilloulin

et al. 2024

Materials

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The common phenomenon observed for concrete in aggressive water is leaching, which involves the dissolution of cement hydration products. Many studies have focused on leaching in demineralised water or acid attacks, but mineral water still deserves further investigation. In most standards, the aggressiveness of a given water body is determined by its pH and not its composition. The effect of the calcium content of the water on degradation is yet to be determined. In this paper, the leaching of Portland cement-based mortar was induced by two types of drinking water with different calcium contents and buffer capacity in controlled conditions. The Langelier saturation index (LSI) was used to describe water aggressiveness based on the calco-carbonic equilibrium. The studied waters had the same pH but LSIs of +0.5 and −1.0 corresponding to scaling with respect to aggressive water; demineralised water was used as a reference. Microstructural damage was checked by TGA and X-ray microtomography. Macroscopic measurements were used to monitor global degradation. The soft water caused a 53% deeper deterioration of the mortar sample than the hard water. Soft water-induced leaching was found to be similar yet slower to leaching via demineralised water (with a mass loss of −2.01% and −2.16% after 200 days, respectively). In contrast, hard water induced strongly time-dependent leaching, and the damage was located close to the surface. The roughness of leached specimens was 18% higher in hard water than in soft water. The formation of calcite on the sample surface not only affects the leaching rate by creating a protective surface layer, but it could also act as a calcium ion pump.

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“…From an environmental point of view, the efficient use of SCMs not only significantly reduces clinker content in cement but also solves the disposal issue for the storage of some industrial residual products. From a technical point of view, a remarkable improvement in the mechanical and durability properties has been observed, especially for concrete containing GBFS and fly ash [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Efficient Multi-Composite Cement Made of Granulated Blast Furnace Slag (GBFS) and Flash-calcined Sediment

Benzerzour,

Chu,

Amar

et al. 2023

Civ Eng J

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The objectives of this study were to find out in detail how well granulated blast furnace slag (GBFS) could be replaced by flash-calcined sediment (SF sediment) in terms of hydration kinetics and mechanical-microstructural properties when developing an eco-friendly cement binder. The results indicated that the SF sediment substitution with a rate of 25% wt significantly improved the hydration kinetics of cement compared to the reference. This contributed to a considerable enhancement of the mechanical-microstructural properties of the mortar containing the SF sediment. By comparison with the reference, the strength of multi-composite cement-based mortar increased by 33% at 2 days and by 4.5% at 28 days, whereas its porosity decreased by 16.32% and by 12.44% for the same period. The SEM-EDS result showed that the SF sediment substitution did not significantly modify the chemical composition of the C-S-H phase, with a Ca/Si ratio range of 1.82 to 2.84 for both cement pastes. Moreover, Mg2+ and Al3+ions were two principal elements incorporated in C-S-H gels, with different ratios depending on the Ca/Si ratio of C-S-H gels. A novel model established from a combination of the curve fitting method and Power’s approach allowed for accurate prediction of the strength development of multi-composite cement-based mortars. Overall, the SF sediment substitution could be considered a promising option to develop a more eco-friendly cement binder, while the novel approach could be used as a reliable model for the strength prediction of blended cement. Doi: 10.28991/CEJ-2023-09-11-02 Full Text: PDF

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Leaching of CEM III paste by demineralised or mineralised water at pH 7 in relation with aluminium release in drinking water network

Cited by 6 publications

References 40 publications

Behavior of calcined clay based geopolymers under sulfuric acid attack: Meta-illite and metakaolin

Behavior of calcined clay based geopolymers under sulfuric acid attack: Meta-illite and metakaolin

Experimental Investigation on the Effects of Mineral Water Composition on the Leaching of Cement-Based Materials

Efficient Multi-Composite Cement Made of Granulated Blast Furnace Slag (GBFS) and Flash-calcined Sediment

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