Compatibility of hydrogarnet,Ca3Al2(SiO4)x(OH)4(3 ? x), with sulfate and carbonate-bearing cement phases: 5–85 °C |
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| Affiliation: | 1. Department of Chemistry, University of Aberdeen, Meston Building, Meston Walk, Old Aberdeen, AB24 3UE Scotland, UK;2. Department of Pure and Industrial Chemistry, Abia State University, P.M.B 2000 Uturu, Abia State, Nigeria;1. Innovation, Holcim Technology Ltd., CH-5113 Holderbank, Switzerland;2. Laboratory of Construction Materials, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland;3. Building Materials, Lund University, Box 124, 221 000 Lund, Sweden;1. Innovation, Holcim Technology Ltd., CH-5113 Holderbank, Switzerland;2. Laboratory of Construction Materials, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland |
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| Abstract: | The stable existence of hydrogarnet in Portland cement compositions cured at temperatures below 55 °C has long been predicted from application of equilibrium thermodynamics. However hydrogarnet is not often reported in hydrated commercial Portland cements. The substitutions (SO4–CO3–OH) in AFm have previously been shown to stabilise AFm to higher temperatures and raise the temperature at which AFm converts to Si-free hydrogarnet, C3AH6. But unanswered question remains about the compatibility of AFm and AFm solid solutions with Si-substituted hydrogarnet, Ca3Al2(SiO4)x(OH)4(3 ? x). Phase relations of C3AH6 and Ca3Al2(SiO4)x(OH)4(3 ? x) at sulfate and carbonate activities conditioned respectively by (gypsum and SO4-AFt) and (calcite and CO3-AFt) have been determined experimentally in the range 5–85 °C. The results confirm the instability of Si-free hydrogarnet with carbonate and sulfate-bearing cement phases, but do indicate that a range of silica-substituted hydrogarnet solid solutions are stable under conditions likely to be encountered in blended cement systems. |
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