Formulation of an alkali-activated grout based on Callovo-Oxfordian argillite for an application in geological radioactive waste disposal

Dupuy, C.; Gharzouni, Ameni; Sobrados, I.; Tessier-Doyen, Nicolas; Texier-Mandoki, Nathalie; Bourbon, Xavier; Rossignol, Sylvie

doi:10.1016/j.conbuildmat.2019.117170

Cited by 15 publications

(8 citation statements)

References 62 publications

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“…After the F–T treatment, the main bands of samples M0 and M1 became wider, which could be related to the decalcification dissolution of C–A–S–H gels. 45 The main bands of samples M2, M3, E3, and T3 were narrowed. This is likely caused by the continuous increase of silicates or substitution of tetrahedral Al in the gel structure.…”

Section: Resultsmentioning

confidence: 92%

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Enhancing Freeze–Thaw Resistance of Alkali-Activated Slag by Metakaolin

Zhang

Cui

et al. 2023

ACS Omega

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Incorporating metakaolin (MK) into slag to prepare alkali-activated materials can reduce shrinkage and improve the durability of alkali-activated slag (AAS). But its durability under freeze–thaw conditions is unknown. In this paper, the effects of MK content on the freeze–thaw properties of AAS were investigated from the perspective of gel composition and pore solution. The experimental results showed that the addition of MK generates a gel mixture of C–A–S–H and N–A–S–H with a cross-linked structure and decreases the content of bound water and pore water absorption. With the increase of alkali dosage, water absorption decreased to 0.28% and then increased to 0.97%, and the leaching rate of ions was Ca2+ > Al3+ > Na+ > OH–. When the alkali dosage was 8 wt % and the MK content was 30 wt %, the compressive strength loss rate of AAS was 0.58% and the mass loss rate was 0.25% after 50 freeze–thaw cycles.

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Section: Resultsmentioning

confidence: 92%

“…The XRD pattern shows that the peak intensity at 29° 2Θ becomes lower. After the F–T treatment, the main bands of samples M0 and M1 became wider, which could be related to the decalcification dissolution of C–A–S–H gels . The main bands of samples M2, M3, E3, and T3 were narrowed.…”

Section: Resultsmentioning

confidence: 95%

Enhancing Freeze–Thaw Resistance of Alkali-Activated Slag by Metakaolin

Zhang

Cui

et al. 2023

ACS Omega

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“…The measured viscosity values were the average over a 1-min measurement, and the spindle's speed was set from 0.1 to 100 rpm, depending on the viscosity evolution. When viscosity reached the maximum measurable value (6,000 Pa.s), the measurements were stopped, indicating the consolidation of the material (Dupuy et al, 2020).…”

Section: Sample Characterizationmentioning

confidence: 99%

Geopolymer Composite Coatings Based on Moroccan Clay and Sands for Restoration Application

et al. 2021

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This study aims to explore geopolymer binders and mortars based on local Moroccan clays and sands as coatings for the restoration of historical monuments in Morocco. For this, five substrates, one geopolymer binder, and two geopolymer mortars were investigated. The characterization of substrates reveals differences in terms of pH value, capillarity, contact angle, and surface roughness. These differences affect the coating thickness, which also depends on the viscosity, liquid to solid ratio, and granular skeleton of the geopolymer coating. High adhesive strength values (up to 9 MPa) were obtained on limestones. However, these values decreased with the increase of relative humidity. In the case of Fez stone, a stable adhesive strength value (3 MPa) was evidenced for all the coating formulations and at different storage conditions confirming the suitability of coating based on metakaolin, Moroccan clays, and sands for restoration applications.

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“…Different thermal treatments were applied to COx argillite such as traditional calcination at different temperatures and flash calcination. Dupuy et al [21], used also COx argillite to produce alkali-activated materials with a pH close to 11 and presenting a wide range of setting time up to 24 h.…”

Section: Introductionmentioning

confidence: 99%

The Use of Callovo-Oxfordian Argillite as a Raw Material for Portland Cement Clinker Production

et al. 2022

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Excavated soils and rocks are materials obtained in construction works that could represent an ecological issue if a durable and efficient reuse process is not set. The radioactive waste disposal planned by the French National Radioactive Waste Management Agency will generate large quantities of excavated soil (mainly as Callovo-Oxfordian argillite). The re-use of excavated soils is a recent question. There is a lack in the literature concerning the recycling of such materials. Therefore, this paper aims to investigate the possibility of using Callovo-Oxfordian argillite (COx argillite from the French URL) as a raw material for Portland cement clinker production. COx argillite was first characterized by X-ray diffraction (XRD) and X-ray fluorescence (XRF) then a Portland cement clinker was synthesized at laboratory scale. The produced clinker was characterized to verify the chemical and mineralogical composition. After adding gypsum, the reactivity of the resulting cement was assessed by setting time and isothermal calorimetry measurements. The compressive strength was assessed on standard mortar prisms at 1, 14 and 28 days. The results show that a Portland cement clinker containing 64% C3S, 14% C2S, 10% C4AF, 7% C3A and 1% CaO can be produced when 22.24% of raw meal was substituted by the COx argillite. The setting time and isothermal calorimetry results show that the produced cement shows an equivalent reactivity to conventional ordinary Portland cement. The compressive strength at 28 days is 56 MPa, showing that the produced cement can be considered as CEM I 52.5 N Portland cement.

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Formulation of an alkali-activated grout based on Callovo-Oxfordian argillite for an application in geological radioactive waste disposal

Cited by 15 publications

References 62 publications

Enhancing Freeze–Thaw Resistance of Alkali-Activated Slag by Metakaolin

Enhancing Freeze–Thaw Resistance of Alkali-Activated Slag by Metakaolin

Geopolymer Composite Coatings Based on Moroccan Clay and Sands for Restoration Application

The Use of Callovo-Oxfordian Argillite as a Raw Material for Portland Cement Clinker Production

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