Calorimetry

doi:10.1201/b19074-2

Cited by 5 publications

(5 citation statements)

References 35 publications

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“…The absence of ettringite peaks in some of the pastes is expected to have resulted from its sensitivity to grinding, as well as to prolonged storage in isopropanol [ 50 ]. In general, calcite may have resulted from carbonation occurred during the milling and storage processes.…”

Section: Resultsmentioning

confidence: 99%

Influence of the Treatment Temperature on the Microstructure and Hydration Behavior of Thermoactivated Recycled Cement

et al. 2020

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This paper intends to contribute to a better knowledge of the production and rehydration of thermoactivated recycled cement and its incorporation in cement-based materials. To this end, the influence of the treatment temperature on the properties of recycled cements and recycled cement pastes was assessed by means of a wide array of tests. Anhydrous recycled cement as well as the resulting pastes were characterized through density and particle size, water demand and setting time, thermogravimetry, X-ray diffraction, field emission gun scanning electron microscopy, isothermal calorimetry, 29Si nuclear magnetic resonance spectroscopy, flowability, mechanical strength, mercury intrusion porosimetry and scanning electron microscopy. The treatment temperature had a significant influence on the dehydration and hydration of recycled cement, essentially resulting in the formation of C2S polymorphs of varying reactivity, which led to pastes of different fresh and hardened behaviors. The high water demand and the pre-hydration of recycled cement resulted in high setting times and low compressive strengths. The highest mechanical strength was obtained for a treatment temperature of 650 °C.

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Section: Resultsmentioning

confidence: 99%

Influence of the Treatment Temperature on the Microstructure and Hydration Behavior of Thermoactivated Recycled Cement

et al. 2020

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“…At specific ages, small pieces were firstly sawed off from the paste specimens, and then ground into fine particles (<63 µm) in a CO 2 -free chamber. Hydration was arrested using isopropanol [solvent exchange (Winnefeld et al, 2016)] for 15 min followed by ether flushing. After drying, about 40 mg of the resulting powder sample was analyzed by recording the weight while heating the sample up from room temperature to 1,000 • C at 10 • C/min, in a TGA 5500 (TA Instruments).…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

Hydration of Binary Portland Cement Blends Containing Silica Fume: A Decoupling Method to Estimate Degrees of Hydration and Pozzolanic Reaction

et al. 2019

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“…Rapid gypsum depletion and early hemicarboaluminate formation are both indicative for undersulfation of the DCP cements. Undersulfation is well known to affect the hydration of C 3 S, the nucleation and growth of C-S-H [ 41 , 42 ] and reduced strength development [ 43 ]. In the case sulfate depletion occurs before the main hydration peak, the C 3 S hydration peak becomes lower and broader [ 44 ].…”

Section: Resultsmentioning

confidence: 99%

Thermal Reactivation of Hydrated Cement Paste: Properties and Impact on Cement Hydration

Gholizadeh-Vayghan,

Meza Hernandez,

Kingne

et al. 2024

Materials

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In this research, the properties and cementitious performance of thermally activated cement pastes (referred to as DCPs) are investigated. Hydrated pastes prepared from Portland cement and slag blended cement were subjected to different thermal treatments: 350 °C for 2 h, 550 °C for 2 h, 550 °C for 24 h and 750 °C for 2 h. The properties and the reactivity as SCM of the DCPs were characterised as well as their effect on the mechanical performance and hydration of new blended cements incorporating the DCPs as supplementary cementitious materials (SCMs). It was observed that the temperature and duration of the thermal treatment increased the grindability and BET specific surface area of the DCP, as well as the formation of C2S phases and the reactivity as SCM. In contrast, the mechanical strength results for the blended cements indicated that thermal treatment at 350 °C for 2 h provided better performance. The hydration study results showed that highly reactive DCP interfered with the early hydration of the main clinker phases in Portland cement, leading to early setting and slow strength gain. The effect on blended cement hydration was most marked for binary Portland cement–DCP blends. In contrast, in the case of ternary slag cement–DCP blends the use of reactive DCP as SCM enabled to significantly increase early age strength.

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Calorimetry

Cited by 5 publications

References 35 publications

Influence of the Treatment Temperature on the Microstructure and Hydration Behavior of Thermoactivated Recycled Cement

Influence of the Treatment Temperature on the Microstructure and Hydration Behavior of Thermoactivated Recycled Cement

Hydration of Binary Portland Cement Blends Containing Silica Fume: A Decoupling Method to Estimate Degrees of Hydration and Pozzolanic Reaction

Thermal Reactivation of Hydrated Cement Paste: Properties and Impact on Cement Hydration

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