Effect of CaSO4 on hydration and phase conversion of calcium aluminate cement

H. M. Son; Solmoi Park; H. Y. Kim; J. H. Seo; H. K. Lee

doi:10.1016/j.conbuildmat.2019.07.004

Effect of CaSO₄ on hydration and phase conversion of calcium aluminate cement

H. M. Son
, Solmoi Park
, H. Y. Kim
, J. H. Seo
, H. K. Lee

Korea Advanced Institute of Science and Technology

Research output: Contribution to journal › Article › peer-review

59 Scopus citations

Abstract

Conversion from metastable phase to stable phase in calcium aluminate cement (CAC) causes volumetric instability, resulting in loss of compressive strength. This study investigated the effect of CaSO₄ on the phase conversion of calcium aluminate cement. The specimens with different dosage of CaSO₄ were exposed to 60 °C to trigger the phase conversion of CAC after curing at 20 °C for 7 days. Analysis with X-ray diffraction, thermogravimetry, mercury intrusion porosimetry, and scanning electron microscopy were conducted. The incorporation of CaSO₄ inhibited the formation of unstable CAH₁₀ by direct precipitation of ettringite. As a result, the reduction of strength of CAC specimens due to the increased pore volume by conversion was inhibited by ettringite and monosulfate formation.

Original language	English
Pages (from-to)	40-47
Number of pages	8
Journal	Construction and Building Materials
Volume	224
DOIs	https://doi.org/10.1016/j.conbuildmat.2019.07.004
State	Published - 10 Nov 2019
Externally published	Yes

Keywords

Calcium aluminate cement
CaSO
Conversion
Ettringite
Metastable phase

Access to Document

10.1016/j.conbuildmat.2019.07.004

Cite this

@article{176fcbbef98544d4ab0e27da91dd0bd4,

title = "Effect of CaSO4 on hydration and phase conversion of calcium aluminate cement",

abstract = "Conversion from metastable phase to stable phase in calcium aluminate cement (CAC) causes volumetric instability, resulting in loss of compressive strength. This study investigated the effect of CaSO4 on the phase conversion of calcium aluminate cement. The specimens with different dosage of CaSO4 were exposed to 60 °C to trigger the phase conversion of CAC after curing at 20 °C for 7 days. Analysis with X-ray diffraction, thermogravimetry, mercury intrusion porosimetry, and scanning electron microscopy were conducted. The incorporation of CaSO4 inhibited the formation of unstable CAH10 by direct precipitation of ettringite. As a result, the reduction of strength of CAC specimens due to the increased pore volume by conversion was inhibited by ettringite and monosulfate formation.",

keywords = "Calcium aluminate cement, CaSO, Conversion, Ettringite, Metastable phase",

author = "Son, \{H. M.\} and Solmoi Park and Kim, \{H. Y.\} and Seo, \{J. H.\} and Lee, \{H. K.\}",

note = "Publisher Copyright: {\textcopyright} 2019",

year = "2019",

month = nov,

day = "10",

doi = "10.1016/j.conbuildmat.2019.07.004",

language = "English",

volume = "224",

pages = "40--47",

journal = "Construction and Building Materials",

issn = "0950-0618",

publisher = "Elsevier Ltd",

}

TY - JOUR

T1 - Effect of CaSO4 on hydration and phase conversion of calcium aluminate cement

AU - Son, H. M.

AU - Park, Solmoi

AU - Kim, H. Y.

AU - Seo, J. H.

AU - Lee, H. K.

PY - 2019/11/10

Y1 - 2019/11/10

N2 - Conversion from metastable phase to stable phase in calcium aluminate cement (CAC) causes volumetric instability, resulting in loss of compressive strength. This study investigated the effect of CaSO4 on the phase conversion of calcium aluminate cement. The specimens with different dosage of CaSO4 were exposed to 60 °C to trigger the phase conversion of CAC after curing at 20 °C for 7 days. Analysis with X-ray diffraction, thermogravimetry, mercury intrusion porosimetry, and scanning electron microscopy were conducted. The incorporation of CaSO4 inhibited the formation of unstable CAH10 by direct precipitation of ettringite. As a result, the reduction of strength of CAC specimens due to the increased pore volume by conversion was inhibited by ettringite and monosulfate formation.

AB - Conversion from metastable phase to stable phase in calcium aluminate cement (CAC) causes volumetric instability, resulting in loss of compressive strength. This study investigated the effect of CaSO4 on the phase conversion of calcium aluminate cement. The specimens with different dosage of CaSO4 were exposed to 60 °C to trigger the phase conversion of CAC after curing at 20 °C for 7 days. Analysis with X-ray diffraction, thermogravimetry, mercury intrusion porosimetry, and scanning electron microscopy were conducted. The incorporation of CaSO4 inhibited the formation of unstable CAH10 by direct precipitation of ettringite. As a result, the reduction of strength of CAC specimens due to the increased pore volume by conversion was inhibited by ettringite and monosulfate formation.

KW - Calcium aluminate cement

KW - CaSO

KW - Conversion

KW - Ettringite

KW - Metastable phase

UR - https://www.scopus.com/pages/publications/85068914685

U2 - 10.1016/j.conbuildmat.2019.07.004

DO - 10.1016/j.conbuildmat.2019.07.004

M3 - Article

AN - SCOPUS:85068914685

SN - 0950-0618

VL - 224

SP - 40

EP - 47

JO - Construction and Building Materials

JF - Construction and Building Materials

ER -

Effect of CaSO₄ on hydration and phase conversion of calcium aluminate cement

Abstract

Keywords

Access to Document

Other files and links

Fingerprint

Cite this