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Alkanolamine-based chemically enhanced hydration reaction of ordinary Portland cement
https://orcid.org/0000-0003-3201-7686
https://orcid.org/0000-0003-2462-3133
https://orcid.org/0000-0002-7049-892X
Highlights Effect of alkanolamine-based grinding agent on OPC hydration has been revealed. It enhanced C4AF reaction with slight C3S acceleration, resulting in more ettringite formation. The C4AF reaction also led to more formation of amorphous phase and monocarboaluminate. Those effects increased compressive strength of OPC mortar in both initial and later stages.
Abstract This study aims to elucidate the origin of the improvement of mechanical properties of ordinary Portland cement (OPC) hydrates with the use of alkanolamine grinding agent (GA). It was found that the chemical activation induced by the use of 0.026 wt% GA led to improvements of the early strength as well as later strength. To be specific, GA predominantly enhanced ferrite (C4AF) hydration in both initial and later stages which resulted in more dissolution of calcite. As a result, the promoted ettringite formation at 1 day and monocarboaluminate (Mc) from 2 day were observed. Although the lower content of portlandite (CH) was found over the whole curing period due to the inhibition of CH crystal growth with GA, the amount of amorphous phase was higher from 1 day. More production of amorphous phase was most conspicuous during 7 to 28 days, which was possibly associated with more production of Fe-containing hydrates from the enhanced C4AF hydration.
Alkanolamine-based chemically enhanced hydration reaction of ordinary Portland cement
https://orcid.org/0000-0003-3201-7686
https://orcid.org/0000-0003-2462-3133
https://orcid.org/0000-0002-7049-892X
Highlights Effect of alkanolamine-based grinding agent on OPC hydration has been revealed. It enhanced C4AF reaction with slight C3S acceleration, resulting in more ettringite formation. The C4AF reaction also led to more formation of amorphous phase and monocarboaluminate. Those effects increased compressive strength of OPC mortar in both initial and later stages.
Abstract This study aims to elucidate the origin of the improvement of mechanical properties of ordinary Portland cement (OPC) hydrates with the use of alkanolamine grinding agent (GA). It was found that the chemical activation induced by the use of 0.026 wt% GA led to improvements of the early strength as well as later strength. To be specific, GA predominantly enhanced ferrite (C4AF) hydration in both initial and later stages which resulted in more dissolution of calcite. As a result, the promoted ettringite formation at 1 day and monocarboaluminate (Mc) from 2 day were observed. Although the lower content of portlandite (CH) was found over the whole curing period due to the inhibition of CH crystal growth with GA, the amount of amorphous phase was higher from 1 day. More production of amorphous phase was most conspicuous during 7 to 28 days, which was possibly associated with more production of Fe-containing hydrates from the enhanced C4AF hydration.
Alkanolamine-based chemically enhanced hydration reaction of ordinary Portland cement
https://orcid.org/0000-0003-3201-7686
https://orcid.org/0000-0003-2462-3133
https://orcid.org/0000-0002-7049-892X
Highlights Effect of alkanolamine-based grinding agent on OPC hydration has been revealed. It enhanced C4AF reaction with slight C3S acceleration, resulting in more ettringite formation. The C4AF reaction also led to more formation of amorphous phase and monocarboaluminate. Those effects increased compressive strength of OPC mortar in both initial and later stages.
Abstract This study aims to elucidate the origin of the improvement of mechanical properties of ordinary Portland cement (OPC) hydrates with the use of alkanolamine grinding agent (GA). It was found that the chemical activation induced by the use of 0.026 wt% GA led to improvements of the early strength as well as later strength. To be specific, GA predominantly enhanced ferrite (C4AF) hydration in both initial and later stages which resulted in more dissolution of calcite. As a result, the promoted ettringite formation at 1 day and monocarboaluminate (Mc) from 2 day were observed. Although the lower content of portlandite (CH) was found over the whole curing period due to the inhibition of CH crystal growth with GA, the amount of amorphous phase was higher from 1 day. More production of amorphous phase was most conspicuous during 7 to 28 days, which was possibly associated with more production of Fe-containing hydrates from the enhanced C4AF hydration.
Alkanolamine-based chemically enhanced hydration reaction of ordinary Portland cement
Jung, Sungjin (author) / Kang, Hyunuk (author) / Kang, Sung-Hoon (author) / Moon, Juhyuk (author)
2023-10-31
Article (Journal)
Electronic Resource
English
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