| Download | - View accepted manuscript: The Thermal decomposition of Ca(OH)2 polymorphs (PDF, 368 KiB)
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| Author | Search for: Beaudoin, J. J.1; Search for: Sato, T.1; Search for: Tumidajski, P. J. |
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| Affiliation | - National Research Council of Canada. NRC Institute for Research in Construction
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| Format | Text, Article |
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| Conference | RILEM - 2nd International Symposium on Advances in Concrete Through Science and Engineering: 11 September 2006, Québec City |
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| Subject | thermal decomposition, calcium hydroxide, crystallinity, thermodynamics; Concrete |
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| Abstract | The thermal decomposition of different polymorphs of Ca(OH)2 with varying degrees of crystallinity and surface area was investigated. The nitrogen surface area values ranged from 3.7 to 31.1 m2/g. The presence of two separate and distinct thermal decomposition events was observed depending on the degree of crystallinity. Binary mixtures of Ca(OH)2 with substantially different degrees of crystallinity exhibited well defined thermal decomposition doublets. In addition Differential Scanning Calorimetry (DSC) experiments (for cycles of heating and cooling) performed in controlled environments pre-conditioned to various relative humidities (RH) also indicated the presence of two distinct endothermal doublets. The endothermic peak temperatures were dependent on the RH and temperature history of the Ca(OH)2 samples. An assessment of factors affecting the observed thermal behavior included: investigation of particle size and degree of crystallinity; observation of combined strain and particle size broadening (Williamson-Hall X-ray plots); heat capacity-temperature characteristics. A thermodynamic analysis of the thermal decomposition process is presented. |
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| Publication date | 2006-09-01 |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NRC number | NRCC 46310
NRC-IRC-18019 |
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| NPARC number | 20377090 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | bedec8af-029a-4fe9-96e3-55790cfbb648 |
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| Record created | 2012-07-24 |
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| Record modified | 2020-04-22 |
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