New scientific evidence of the effect of high temperatures and long curing times on MK-blended cement paste mineralogy

Frı́as, Moisés; Martínez-Ramírez, S.; Villa, Raquel Vigil de la; García-Giménez, Rosario; Rojas, M.I. Sánchez de

doi:10.1016/j.cemconres.2021.106657

Cited by 20 publications

(5 citation statements)

References 45 publications

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“…The generated phases (CSHs, CH) are attributed to hydration of unreacted di/tri-calcium silicates (β-C 2 S and C 3 S). The shape of CSHs (needles, fibers, rods, sheets, stacked plates) mainly depends on curing conditions (time, temperature, pressure, curing medium) as well as starting materials [96]. Almost, needle crystals appears in the first month as in case of OPC hydration and this observation is in line with the investigation of Hashem et al, 2021 [77].…”

Section: Morphologysupporting

confidence: 79%

De-aluminated metakaolin-cement composite modified with commercial titania as a new green building material for gamma-ray shielding applications

Ramadan

Kohail²,

Abadel³

et al. 2022

Case Studies in Construction Materials

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Section: Morphologysupporting

confidence: 79%

De-aluminated metakaolin-cement composite modified with commercial titania as a new green building material for gamma-ray shielding applications

Ramadan

Kohail²,

Abadel³

et al. 2022

Case Studies in Construction Materials

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“…SEM/EDX exploration identified non-crystalline phases in all the pastes associated with fibrous C-S-H gels which, once formed, served as a growth substrate for ettringite fibres and portlandite plates (Figure 1). All the phases at issue grew in size with time [28]. The 7% HsT/glass sample (Figure 2, left) was observed to be denser, more compact, and less porous than 7% HcG/glass paste (Figure 2, right), which was more porous, particularly between the portlandite plates and ettringite fibres, with the appearance of many interphase voids.…”

Section: Sem/edx Morphological Analysismentioning

confidence: 99%

Section: Sem/edx Morphological Analysismentioning

confidence: 99%

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Concrete/Glass Construction and Demolition Waste (CDW) Synergies in Ternary Eco-Cement-Paste Mineralogy

et al. 2022

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The study described sought further understanding of the synergies in a mix of CDW pozzolans, containing (calcareous and siliceous) concrete and glass waste, used to prepare ternary eco-cement paste bearing 7% of the binary blend at concrete/glass ratios of 2:1 and 1:2. The mineralogical phases in the 2-day, 28-day, and 90-day cement matrices were identified and monitored using XRF, XRD-Rietveld, SEM-EDX, FT-IR, and NMR. The findings showed that changes in the reaction kinetics in the ternary blended pastes relative to OPC pastes depended on the nature of the recycled concrete and the glass content. Adding the binary mix bearing calcareous concrete (at a ratio of 2:1) favoured ettringite, portlandite, and amorphous phase formation, whilst the blends with siliceous concrete favoured C-S-H gel formation. Monocarboaluminate was detected in the 90-day siliceous concrete and glass pastes in amounts similar to those found in the reference OPC paste.

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“…At present, domestic and foreign scholars studied cementing slurry systems suitable for heavy oil thermal recovery, mainly in the following two directions: one is the optimization of the chemical composition of cement to increase the relative content of high-temperature resistant hydration products in cement hydration products (Dener et al, 2021;Yang et al, 2021;Frías et al, 2022); the other is the introduction of materials with high strength and high thermal conductivity at high temperatures to optimize the internal microstructure of cement paste (Jiang et al, 2021a;Jiang et al, 2021b;Zhang et al, 2021c). However, most of the existing studies focused on addressing the problem of strength decline at high temperatures, but ignored the damage to the cement sheath caused by CO 2 corrosion.…”

Section: Introductionmentioning

confidence: 99%

Effect of CO2 on the Hydration of Aluminate Cement Under Conditions of Burning Reservoir in Heavy Oil Thermal Recovery

Wu¹,

Wu²,

Xing³

et al. 2022

Front. Mater.

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Under conditions of heavy oil thermal recovery, cement sheaths often suffer high-temperature performance degradation and CO2 corrosion. The performance of Class G oil well cement commonly used for cementing, deteriorates significantly at high temperatures and in CO2 environments, which can easily cause accidents. By contrast aluminate cement (CAC), at the same time, has good high-temperature resistance and corrosion resistance. Therefore, this study explored the mechanical properties and permeability of CAC with a high-temperature stabiliser cement slurry system (C1), pure CAC slurry system (C2) and Portland cement with sand cement slurry system (C3) before and after corrosion at 50, 300, 400, 500, and 600°C. The micromorphology, hydration products and pore structure of the cement paste before and after corrosion were analyzed using scanning electron microscopy, X-ray diffraction, thermogravimetry and nitrogen adsorption specific surface area and pore diameter analysis; additionally, the hydration mechanism of CAC under high temperatures and in CO2 environments was explored. The results show that the degree of degradation of the mechanical properties of C1 cement slurry system at high temperatures and under CO2 corrosive environments is significantly lower than that of the C3 cement slurry system. At a curing high temperature of 400°C, the maximum strength of the C1 cement paste reached 36.39 ± 0.37 MPa. The addition of a high-temperature stabiliser improved the mechanical properties of CAC at low temperatures, reduced the formation of C3ASH4 in the cement paste at high temperatures, and improved the strength of the cement paste after high-temperature curing. Compared with the C3 cement slurry system, the C1 cement slurry system had better high-temperature resistance and corrosion resistance and was more suitable for application under conditions of a burning reservoir in heavy oil thermal recovery.

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New scientific evidence of the effect of high temperatures and long curing times on MK-blended cement paste mineralogy

Cited by 20 publications

References 45 publications

De-aluminated metakaolin-cement composite modified with commercial titania as a new green building material for gamma-ray shielding applications

De-aluminated metakaolin-cement composite modified with commercial titania as a new green building material for gamma-ray shielding applications

Concrete/Glass Construction and Demolition Waste (CDW) Synergies in Ternary Eco-Cement-Paste Mineralogy

Effect of CO2 on the Hydration of Aluminate Cement Under Conditions of Burning Reservoir in Heavy Oil Thermal Recovery

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