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Effect of accelerators on Ca(OH)2 activated ground granulated blast-furnace slag at low curing temperature

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Title: Effect of accelerators on Ca(OH)2 activated ground granulated blast-furnace slag at low curing temperature
Authors: Zhai, Qi Browse this author
Kurumisawa, Kiyofumi Browse this author →KAKEN DB
Keywords: GGBFS
Low curing temperature
Issue Date: Nov-2021
Publisher: Elsevier
Journal Title: Cement & concrete composites
Volume: 124
Start Page: 104272
Publisher DOI: 10.1016/j.cemconcomp.2021.104272
Abstract: The early effects of three accelerators on a Ca(OH)2 activated ground granulated blast-furnace slag binder at low curing temperatures are discussed. The compressive strength, hydration kinetics, hydration products, and microstructures were investigated by isothermal calorimetry, X-ray diffraction, mercury intrusion porosimetry, scanning electron microscopy, and nuclear magnetic resonance. Results show that accelerators continue to promote the strength development of pastes in the early stage during low-temperature curing, especially with sodium sulfate, which exhibits a higher strength and hydration degree in the early stage. However, accelerators cannot effectively improve the pore structure at low-temperature curing, which severely restricts the development of strength, compared with that at 20 degrees C. Furthermore, a good correlation was found between the initial strength development and the limit equivalent ionic conductivity (LEIC), suggesting that LEIC influences the reaction acceleration of blast-furnace slag at an early age.
Rights: © <2021>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
Type: article (author version)
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 胡桃澤 清文

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