Effect of clinkering conditions on phase evolution and microstructure of Belite Calcium-Sulpho-Aluminate cement clinker

Koumpouri, D; Karatasios, Ioannis; Psycharis, V.; Giannakopoulos, Ioannis; Katsiotis, Marios S.; Kilikoglou, Vassilis

doi:10.1016/j.cemconres.2021.106529

Cited by 27 publications

(7 citation statements)

References 39 publications

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“…It has fracture surfaces that develop directly through the C 2 AS crystals rather than from the grain boundaries because of its laminar crystal structure, 35 which gives C 2 AS particle a more angular particle shape. Most of the CA particles are present in broken flakes reflecting their good fragility, but some of them exhibit a microstructure with fine pores arranged on the surface, which is different from the typical ellipsoidal shape with good crystalline morphology reported for clinkers of common $‐A systems 47 . The large single‐phase particles of C 12 A 7 are difficult to be discovered, and in large particles, it mostly exists as a compound with C 2 S, whereas its single‐phase particles are mostly found in small sizes as blocks with no regular shape.…”

Section: Resultsmentioning

confidence: 99%

“…Most of the CA particles are present in broken flakes reflecting their good fragility, but some of them exhibit a microstructure with fine pores arranged on the surface, which is different from the typical ellipsoidal shape with good crystalline morphology reported for clinkers of common $-A systems. 47 The large single-phase particles of C 12 A 7 are difficult to be discovered, and in large particles, it mostly exists as a compound with C 2 S, whereas its single-phase particles are mostly found in small sizes as blocks with no regular shape. This suggests that C 12 A 7 is susceptible to breakage with the internal stresses brought about by the crystal transformation.…”

Section: S-c 2 As-ca-c 3 Amentioning

confidence: 99%

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Phase evolution and pulverization mechanism of self‐pulverizing carbonatable clinkers

Liu

Wang

et al. 2022

J Am Ceram Soc.

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This paper investigates the phase evolution and pulverization mechanism of a self‐pulverizing carbonatable clinker (SPCC) with a variety of raw material compositions. The particle size, mineral phases, and microstructure of SPCC, produced by sintering at 1400°C for 3 h, were systematically studied by laser particle size testing, XRD/QXRD and SEM/EDS. Results show that clinkers sintered by raw materials with low‐Ca/low‐Al (Ca/Si < 1.6; Al2O3 < 10 wt.%) or high‐Ca/medium‐Al (Ca/Si > 2.6; Al2O3 ≈ 10 wt.%) are non‐pulverized after cooling. The mineral phases of C2AS, CA, and C12A7 are considered to facilitate clinker pulverization at low γ‐C2S contents. With the increase of Al2O3 content in raw materials, SPCC is refined in particle size, accompanied by the significant decrease in the content of calcium silicates. Based on the results, guidelines for producing SPCC are proposed.

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Section: Resultsmentioning

confidence: 99%

Section: S-c 2 As-ca-c 3 Amentioning

confidence: 99%

Phase evolution and pulverization mechanism of self‐pulverizing carbonatable clinkers

Liu

Wang

et al. 2022

J Am Ceram Soc.

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“…There, the amount of C 4 A 3 Ś decreases because SO 3 2is used to form alkali sulfate and not as a replacement ion in the C 2 S lattice as in samples with Na 2 O addition. In the alkali incorporated samples, regardless of the type of alkali, C 3 A 4 Ś never reached the target value, which could be due to the formation of alkali sulfates or to the partial volatilization of sulfur from unreacted anhydrite or its partial decomposition in C 3 A and the release of SO 2 [35] (Table 2). In general, the decrease of the calcium sulfoaluminate phase is higher in Na 2 O-incorporated clinkers due to the formation of haüyn, the endmember of the sodalite solid solution, where Ca 2+ and Al 3+ are replaced by Na + and Si 4+ [36].…”

Section: X-ray Powder Diffractionmentioning

confidence: 99%

Influence of Alkalis on the Phase Development of Belite-Sulfoaluminate Clinkers

Ceplak¹

2022

Ceramics - Silikaty

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This paper presents a study on the influence of different amounts of alkalis (K 2 O and Na 2 O) on clinker phase formation, microstructure, phase composition and reactivity of belite-sulfoaluminate cement clinker. Using X-ray powder diffraction and scanning electron microscopy with energy dispersive spectrometry, it was found that the amount of C 2 S and C 4 AF increases with the incorporation of alkalis, while the amount of C 4 A 3 Ś and CŚ decreases. In addition to the major phases, the samples with alkalis also consist of minor phases such as C 3 A (tricalcium aluminate), KŚ (arcanite), and KC 2 Ś 3 (Ca-langbeinite). The major ions in the major phases were substituted by alkali cations and some other ions (Ca 2+ , Al 3+ , Fe 3+ , S 2-, S 6+ , Si 4+ ). The alkalis also affect the microstructure of the clinker, e.g., the shape of the grains. Consequently, isothermal calorimetry was used to detect differences in hydration kinetics. The clinker with 2 wt. % K 2 O content was the most reactive, while the sample with 0.5 wt. % Na content was the least reactive. The latter was primarily influenced by the content of the main and minor phases of the clinker.

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“…These crystals can still be observed in large quantities after curing at 220 °C. This is also one of the main reasons contributing to the decline of the strength of the HBC cement stone (Koumpouri et al, 2021).…”

Section: Pore Size Analysis Of Hbcmentioning

confidence: 99%

“…The CaO/SiO 2 molecular ratio in this cement material is significantly higher than that of the class G oil well cement, thus, retaining the high temperature cement strength to a certain extent (Jiang et al, 2021a). The clinker system of HBC can be easily grinded and possesses a low firing temperature (Koumpouri et al, 2021). It also exhibits significant advantages such as low heat of hydration and high later strength (Sui et al, 2015;Cuesta et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

High-Temperature Mechanical Properties and Microstructure of High Belite Cement

Xie²,

Yang

et al. 2022

Front. Mater.

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The use of the class G oil well cement for cementing in high-temperature deep-seated oil and gas wells declines its mechanical properties, which limit its application under high-temperature conditions. The high belite cement (HBC), a new class of energy-saving and environmentally friendly cement, has been widely used in recent years. In this study, the mechanical properties, phase composition and microstructure of HBC and quartz sand have been analyzed at high temperature, so as to optimize the amount of sand and provide guidelines for further exploring the application of HBC in the high-temperature oil and gas well cementing. The experimental results show that the high-temperature mechanical properties of the cement stone mixed with 40% quartz sand are the highest, thus, delaying the decline in the strength to the greatest extent. The microscopic analysis reveals that HBC produces dicalcium silicate hydrate and hydroxyl silicon calcium stone at high temperature. On mixing the quartz sand, xonotlite is observed to appear in the cement hydrate phase. These products are observed to be small in size and dense in structure, thus, leading to a delay in the decline of the high-temperature mechanical properties of the cement stone.

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Effect of clinkering conditions on phase evolution and microstructure of Belite Calcium-Sulpho-Aluminate cement clinker

Cited by 27 publications

References 39 publications

Phase evolution and pulverization mechanism of self‐pulverizing carbonatable clinkers

Phase evolution and pulverization mechanism of self‐pulverizing carbonatable clinkers

Influence of Alkalis on the Phase Development of Belite-Sulfoaluminate Clinkers

High-Temperature Mechanical Properties and Microstructure of High Belite Cement

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