Quick setting property and hydration of Portland cement with accelerating agent based on calcium aluminate

Minoru Takehiro, Seishi Goto, Koji Ioku, Hirotaka Fujimori

Research output: Contribution to journalArticle

Abstract

The hydration of cement containing quick setting agents, where the setting agents were based on calcium aluminate, was investigated to discuss the relationship between quick setting properties and hydration characteristics of calcium aluminates. The calcium aluminate with different crystallinity and different CaO/Al2O3 molar ratio of 1.74 and 2.53 were synthesized by means of air quenching method. The following results were obtained. (1) A mixture of cement and calcium aluminate without additives did not have quick setting properties. (2) When a quick setter composed as a mixture of calcium aluminate with suitable amount of NaAlO2, Al(OH)3, CaO, Na2CO3 and CaSO4, the addition of 7% of the quick setter for cement mixture with W/C ratio of 0.6 resulted to set the paste within 30 s to 2 min. A mortar with W/C ratio of 0.6 and SO3/CaO ratio of 0.33 set within 10 min. (3) Non-crystallinity and high CaO/Al2O3 molar ratio were very important for quick setter based on calcium aluminate. (4) A cement paste with 7% of quick setter evolved a large amount of heat of initial stage of hydration, which corresponded to the amount of ettringite formed. The larger the heat of hydration, the faster the setting time. In a paste having a good quick setting property, ettringite with 5 to 10 μm in size were formed and these hydration products were well connected each other.

Original languageEnglish
Pages (from-to)209-214
Number of pages6
JournalZairyo/Journal of the Society of Materials Science, Japan
Volume49
Issue number2
Publication statusPublished - 2000 Feb
Externally publishedYes

Fingerprint

accelerating agents
Portland cement
cements
Hydration
hydration
calcium
Calcium
Cements
Ointments
aluminates
heat
Mortar
Quenching
calcium aluminate
crystallinity
quenching
Air
air

ASJC Scopus subject areas

  • Chemical Engineering (miscellaneous)
  • Metals and Alloys
  • Polymers and Plastics

Cite this

Quick setting property and hydration of Portland cement with accelerating agent based on calcium aluminate. / Takehiro, Minoru; Goto, Seishi; Ioku, Koji; Fujimori, Hirotaka.

In: Zairyo/Journal of the Society of Materials Science, Japan, Vol. 49, No. 2, 02.2000, p. 209-214.

Research output: Contribution to journalArticle

@article{a90dee368d3a4cb7b210d8d2092a2e57,
title = "Quick setting property and hydration of Portland cement with accelerating agent based on calcium aluminate",
abstract = "The hydration of cement containing quick setting agents, where the setting agents were based on calcium aluminate, was investigated to discuss the relationship between quick setting properties and hydration characteristics of calcium aluminates. The calcium aluminate with different crystallinity and different CaO/Al2O3 molar ratio of 1.74 and 2.53 were synthesized by means of air quenching method. The following results were obtained. (1) A mixture of cement and calcium aluminate without additives did not have quick setting properties. (2) When a quick setter composed as a mixture of calcium aluminate with suitable amount of NaAlO2, Al(OH)3, CaO, Na2CO3 and CaSO4, the addition of 7{\%} of the quick setter for cement mixture with W/C ratio of 0.6 resulted to set the paste within 30 s to 2 min. A mortar with W/C ratio of 0.6 and SO3/CaO ratio of 0.33 set within 10 min. (3) Non-crystallinity and high CaO/Al2O3 molar ratio were very important for quick setter based on calcium aluminate. (4) A cement paste with 7{\%} of quick setter evolved a large amount of heat of initial stage of hydration, which corresponded to the amount of ettringite formed. The larger the heat of hydration, the faster the setting time. In a paste having a good quick setting property, ettringite with 5 to 10 μm in size were formed and these hydration products were well connected each other.",
author = "Minoru Takehiro and Seishi Goto and Koji Ioku and Hirotaka Fujimori",
year = "2000",
month = "2",
language = "English",
volume = "49",
pages = "209--214",
journal = "Zairyo/Journal of the Society of Materials Science, Japan",
issn = "0514-5163",
publisher = "Society of Materials Science Japan",
number = "2",

}

TY - JOUR

T1 - Quick setting property and hydration of Portland cement with accelerating agent based on calcium aluminate

AU - Takehiro, Minoru

AU - Goto, Seishi

AU - Ioku, Koji

AU - Fujimori, Hirotaka

PY - 2000/2

Y1 - 2000/2

N2 - The hydration of cement containing quick setting agents, where the setting agents were based on calcium aluminate, was investigated to discuss the relationship between quick setting properties and hydration characteristics of calcium aluminates. The calcium aluminate with different crystallinity and different CaO/Al2O3 molar ratio of 1.74 and 2.53 were synthesized by means of air quenching method. The following results were obtained. (1) A mixture of cement and calcium aluminate without additives did not have quick setting properties. (2) When a quick setter composed as a mixture of calcium aluminate with suitable amount of NaAlO2, Al(OH)3, CaO, Na2CO3 and CaSO4, the addition of 7% of the quick setter for cement mixture with W/C ratio of 0.6 resulted to set the paste within 30 s to 2 min. A mortar with W/C ratio of 0.6 and SO3/CaO ratio of 0.33 set within 10 min. (3) Non-crystallinity and high CaO/Al2O3 molar ratio were very important for quick setter based on calcium aluminate. (4) A cement paste with 7% of quick setter evolved a large amount of heat of initial stage of hydration, which corresponded to the amount of ettringite formed. The larger the heat of hydration, the faster the setting time. In a paste having a good quick setting property, ettringite with 5 to 10 μm in size were formed and these hydration products were well connected each other.

AB - The hydration of cement containing quick setting agents, where the setting agents were based on calcium aluminate, was investigated to discuss the relationship between quick setting properties and hydration characteristics of calcium aluminates. The calcium aluminate with different crystallinity and different CaO/Al2O3 molar ratio of 1.74 and 2.53 were synthesized by means of air quenching method. The following results were obtained. (1) A mixture of cement and calcium aluminate without additives did not have quick setting properties. (2) When a quick setter composed as a mixture of calcium aluminate with suitable amount of NaAlO2, Al(OH)3, CaO, Na2CO3 and CaSO4, the addition of 7% of the quick setter for cement mixture with W/C ratio of 0.6 resulted to set the paste within 30 s to 2 min. A mortar with W/C ratio of 0.6 and SO3/CaO ratio of 0.33 set within 10 min. (3) Non-crystallinity and high CaO/Al2O3 molar ratio were very important for quick setter based on calcium aluminate. (4) A cement paste with 7% of quick setter evolved a large amount of heat of initial stage of hydration, which corresponded to the amount of ettringite formed. The larger the heat of hydration, the faster the setting time. In a paste having a good quick setting property, ettringite with 5 to 10 μm in size were formed and these hydration products were well connected each other.

UR - http://www.scopus.com/inward/record.url?scp=0033886725&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033886725&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0033886725

VL - 49

SP - 209

EP - 214

JO - Zairyo/Journal of the Society of Materials Science, Japan

JF - Zairyo/Journal of the Society of Materials Science, Japan

SN - 0514-5163

IS - 2

ER -