Hydration of calcium sulfoaluminate cement blended with blast-furnace slag

Yoon, H.N.; Seo, Joonho; Kim, Seonhyeok; Lee, Haeng‐Ki; Park, Solmoi

doi:10.1016/j.conbuildmat.2020.121214

Cited by 59 publications

(22 citation statements)

References 55 publications

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“…YFC'nin XRD analizinde en belirgin piklerin gehlenit ve anhidrit olduğu izlenmekte olup Tablo 1'deki kimyasal bileşime uygun oksit ve bileşiklere rastlanmıştır. Aynı zamanda YFC'nin camsı fazının 2'nın 20-38 derece arasında maksimum duruma geldiği ve SiO2, CaO ve Al2O3 den oluşan yoğun bir amorf yapı şeklinde kendini gösterdiği izlenmektedir (Şekil 1b) [42], [45], [46]. Camsı faz miktarı YFC'nin hidrolik özelliklerini belirleyici en önemli unsurlardan birisi olup, camsı faz miktarıyla dayanım arasında, kabaca da olsa doğrusal bir ilişkinin olabileceği belirtilmektedir [42].…”

Section: Mi̇neroloji̇k Anali̇zlerunclassified

Investigation of Structural and Mechanical Properties of Blast Furnace Slag Substituted Cements

ŞAHİN¹,

Koçak

2022

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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Gerek doğal gerekse yapay puzolanik malzemeler çimento ve beton teknolojisinde yoğun olarak kullanılmaktadır. Özellikle yapay puzolanların kullanımının atık değerlemesi, çevre kirliliğinin azaltılması, enerji kaynaklarının korunması, dayanım ve dayanıklılığa katkısı nedeniyle giderek yaygınlaştığı görülmektedir. Bu amaçla yapılan çalışmanın ilk aşamasında Portland çimento ve yüksek fırın cürufunun fiziksel, kimyasal, mineralojik, termal özellikleri ve bağ yapıları gibi yapısal özellikleri belirlenmiştir. İkinci aşamada yüksek fırın cürufu ağırlıkça %0, %5, %10, %15 ve %20 oranlarında Portland çimento yerine ikame edilerek 5 tipte çimento elde edilmiştir. Üçüncü aşamada ise bu çimentolarla üretilen çimento hamur ve harç örnekleri üzerinde su ihtiyacı, genleşmesi, priz süresi ve basınç dayanımı değerleri belirlenmiştir. Sonuç olarak yapılan deneyler neticesinde elde edilen veriler, Portland çimento ve yüksek fırın cürufunun fiziksel, kimyasal, mineralojik özellikleri ile bağ yapılarına göre su ihtiyacında, priz sürelerinde ve basınç dayanımlarında farklılıklar olduğunu göstermiştir. Nihayetinde endüstriyel bir atık olan yüksek fırın cürufunun çimento ve beton teknolojisinde kullanılmasıyla ekonomik ve ekolojik yarar sağlanabileceği düşünülmektedir.

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Section: Mi̇neroloji̇k Anali̇zlerunclassified

Investigation of Structural and Mechanical Properties of Blast Furnace Slag Substituted Cements

ŞAHİN¹,

Koçak

2022

Düzce Üniversitesi Bilim Ve Teknoloji Dergisi

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“…The development and utilization of a new cementitious binder is an effective method to decrease the carbon footprint of the cement industry [ 3 , 4 ]. At present, non-tradition cementitious materials have received extensive attention, such as calcium sulphoaluminate (CSA) cement, alkali-activated materials [ 5 , 6 , 7 , 8 ], etc. The carbon emissions from manufacturing CSA cement are about 25% less than those from producing traditional Portland cement [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Limestone Powder on the Early Hydration Behavior of Ye’elimite: Experimental Research and Thermodynamic Modelling

Wang

Shi

et al. 2022

Materials

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To investigate the effects of limestone powder and gypsum on the early hydration of ye’elimite, the hydration behavior of C4A3S¯-LP-CaSO4·2H2O-H2O systems are researched. The hydration behavior of systems are researched by employing isothermal calorimetry, XRD technique and chemical shrinkage. The thermodynamic modelling method is employed to predict the equilibrium phase assemblages. The results show that the system with 5 wt.% LP has a comparable hydration heat evolution to limestone powder-free systems. Limestone powder can take part in the reaction to produce monocarboaluminate in the system with M-value (molar ratio of gypsum to ye’elimite) of 1, but monocarboaluminate is not found in the system with M-value of 2. The level off time of chemical shrinkage shortens with the increase of limestone powder dosage. Thermodynamic modelling results show that monocarboaluminate is no longer formed in all systems when M-value exceeds 1.27, which corresponds to the XRD results. This study can provide theoretical guidance for the rational utilization of limestone powder in calcium sulphoaluminate cement.

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“…For example, artificial cementation has been applied for soil stabilization, for column-type reinforcement in soft soils, in gravity composite structures, for liquefaction mitigation, and as in-place barriers for cutting off seepage [12][13][14]. Cement-based stabilization is the most common method for enhancing the performance of soft soils used in construction projects, in which ordinary Portland cement (OPC) is always chosen as the binder owing to its easy availability, and extensive literature is available for reference [15][16][17][18][19]. OPC-treated soil has improved bearing capacity and reduced permeability and compressibility [20,21].…”

Section: Introductionmentioning

confidence: 99%

Strength Performance and Microstructure of Calcium Sulfoaluminate Cement-Stabilized Soft Soil

et al. 2021

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Calcium sulfoaluminate cement (CSA) was used to stabilize a type of marine soft soil in Dalian China. Unconfined compressive strength (UCS) of CSA-stabilized soil was tested and compared to ordinary Portland cement (OPC); meanwhile the influence of amounts of gypsum in CSA and cement contents in stabilized soils on the strength of stabilized soils were investigated. X-ray diffraction (XRD) tests were employed to detect generated hydration products, and scanning electron microscopy (SEM) was conducted to analyze microstructures of CSA-stabilized soils. The results showed that UCS of CSA-stabilized soils at 1, 3, and 28 d firstly increased and then decreased with contents of gypsum increasing from 0 to 40 wt.%, and CSA-stabilized soils exhibited the highest UCS when the content of gypsum equaled 25 wt.%. When the mixing amounts of OPC and CSA were the same, CSA-stabilized soils had a significantly higher early strength (1 and 3 d) than OPC. For CSA-stabilized soil with 0 wt.% gypsum, monosulfate (AFm) was detected as a major hydration product. As for CSA-stabilized soil with certain amounts of gypsum, the intensity of ettringite (Aft) was significantly higher than that in the sample hydrating without gypsum, but a tiny peak of AFm also could be detected in the sample with 15 wt.% gypsum at 28 d. Additionally, the intensity of AFt increased with the contents of gypsum increasing from 0 to 25 wt.%. When contents of gypsum increased from 25 to 40 wt.%, the intensity of AFt tended to decrease slightly, and residual gypsum could be detected in the sample with 40 wt.% gypsum at 28 d. In the microstructure of OPC-stabilized soils, hexagonal plate-shaped calcium hydroxide (CH) constituted skeleton structures, and clusters of hydrated calcium silicates (C-S-H) gel adhered to particles of soils. In the microstructure of CSA-stabilized soils, AFt constituted skeleton structures, and the crystalline sizes of ettringite increased with contents of gypsum increasing; meanwhile, clusters of the aluminum hydroxide (AH3) phase could be observed to adhere to particles of soils and strengthen the interaction.

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Hydration of calcium sulfoaluminate cement blended with blast-furnace slag

Cited by 59 publications

References 55 publications

Investigation of Structural and Mechanical Properties of Blast Furnace Slag Substituted Cements

Investigation of Structural and Mechanical Properties of Blast Furnace Slag Substituted Cements

Effects of Limestone Powder on the Early Hydration Behavior of Ye’elimite: Experimental Research and Thermodynamic Modelling

Strength Performance and Microstructure of Calcium Sulfoaluminate Cement-Stabilized Soft Soil

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