TY - JOUR
T1 - Early age hydration of calcium sulfoaluminate (synthetic ye'elimite, ) in the presence of gypsum and varying amounts of calcium hydroxide
AU - Hargis, Craig W.
AU - Kirchheim, Ana Paula
AU - Monteiro, Paulo J. M.
AU - Gartner, Ellis M.
N1 - KAUST Repository Item: Exported on 2020-10-01
Acknowledged KAUST grant number(s): KUS-l1-004021
Acknowledgements: C.W. Hargis was supported by the Berkeley Fellowship for Graduate Study and the Carlson-Polivka Fellowship. A.P. Kirchheim acknowledges the financial support of CAPES (Fundacao Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Ministerio da Educacao - Brasil) and CNPq (National Counsel of Technological and Scientific Development). Research at XM-1 is supported by the Director, Office of Science, Office of Basic Energy Sciences, of the U.S. Department of Energy under contract no. DE-AC02-05CH11231. We thank Peter Fischer and Mi-Young Im for assisting the XM-1 users and maintaining the beamline. This publication was based on work supported in part by award no. KUS-l1-004021, made by King Abdullah University of Science and Technology (KAUST).
This publication acknowledges KAUST support, but has no KAUST affiliated authors.
PY - 2013/6
Y1 - 2013/6
N2 - Suspensions of synthetic ye'elimite (C4A3S̄) in a saturated gypsum (CS̄H2) and calcium hydroxide (CH) solution were examined in-situ in a wet cell by soft X-ray transmission microscopy and ex-situ by scanning electron microscopy. The most voluminous hydration product observed was ettringite. Ettringite commonly displayed acicular, filiform, reticulated, and stellate crystal habits. Additionally, pastes with C 4A3S̄, 15% CS̄H2, and varying amounts of CH were prepared and examined with X-ray diffraction (XRD) and isothermal calorimetry. The XRD experiments showed that increasing CH content caused more solid solution (SO4 2 -/OH-) AFm phases to form at early ages (< 1 d) and more monosulfate to form at later ages (> 1 d). Calorimetry indicated that the increased production of solid solution AFm was accompanied with an increase in the initial (< 30 min) rate of heat evolution, and increasing CH generally reduced the time till the second maximum rate of heat evolution due to the formation of ettringite and monosulfate. © 2013 Elsevier Ltd.
AB - Suspensions of synthetic ye'elimite (C4A3S̄) in a saturated gypsum (CS̄H2) and calcium hydroxide (CH) solution were examined in-situ in a wet cell by soft X-ray transmission microscopy and ex-situ by scanning electron microscopy. The most voluminous hydration product observed was ettringite. Ettringite commonly displayed acicular, filiform, reticulated, and stellate crystal habits. Additionally, pastes with C 4A3S̄, 15% CS̄H2, and varying amounts of CH were prepared and examined with X-ray diffraction (XRD) and isothermal calorimetry. The XRD experiments showed that increasing CH content caused more solid solution (SO4 2 -/OH-) AFm phases to form at early ages (< 1 d) and more monosulfate to form at later ages (> 1 d). Calorimetry indicated that the increased production of solid solution AFm was accompanied with an increase in the initial (< 30 min) rate of heat evolution, and increasing CH generally reduced the time till the second maximum rate of heat evolution due to the formation of ettringite and monosulfate. © 2013 Elsevier Ltd.
UR - http://hdl.handle.net/10754/598044
UR - https://linkinghub.elsevier.com/retrieve/pii/S0008884613000550
UR - http://www.scopus.com/inward/record.url?scp=84876145919&partnerID=8YFLogxK
U2 - 10.1016/j.cemconres.2013.03.001
DO - 10.1016/j.cemconres.2013.03.001
M3 - Article
SN - 0008-8846
VL - 48
SP - 105
EP - 115
JO - Cement and Concrete Research
JF - Cement and Concrete Research
ER -