Effect of accelerators on Ca(OH)2 activated ground granulated blast-furnace slag at low curing temperature
Effect of accelerators on Ca(OH)2 activated ground granulated blast-furnace slag at low curing temperature
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DOI：
10.1016/j.cemconcomp.2021.104272
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发表时间：
2021-11
影响因子：
10.5
通讯作者：
Qingwei Zhai;Kiyofumi Kurumisawa
中科院分区：
文献类型：
--
作者：
Qingwei Zhai;Kiyofumi Kurumisawa
研究了三种速凝剂对Ca（OH）2活化高炉矿渣粉胶凝材料在低温养护条件下的早期影响。采用等温量热法、X射线衍射法、压汞法、扫描电子显微镜和核磁共振法研究了水泥的抗压强度、水化动力学、水化产物和微观结构。结果表明，促凝剂在低温养护过程中继续促进浆体早期强度的发展，特别是硫酸钠的促凝效果更好，其早期强度和水化程度更高。然而，与20 °C时相比，促进剂不能有效改善低温固化时的孔结构，严重制约了强度的发展。此外，一个很好的相关性之间的初始强度发展和极限等效离子电导率（LEIC），表明LEIC影响反应加速高炉矿渣在早期的年龄。
The early effects of three accelerators on a Ca(OH)2activated 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 °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.