Abstract
Crystalline admixtures (CAs), categorized as permeability-reducing admixtures, are commercial products employed in low contents in cement-based materials either to improve concrete durability or to stimulate autogenous healing of cracks. This study investigated the effects on crystal formation promoted by CA presence in cementitious pastes by thermal analysis. X-ray diffraction was used as a complementary technique to identify the formed phases. The results indicated that the increment in CA content increased calcium hydroxide (CH) and monocarboaluminate contents. However, it did not change the total combined water and calcium carbonate (CaCO3) contents. In fact, the increment in CA content prolonged the retarding of hydration reactions and decreased the dehydroxylation temperature of CH, suggesting the decrease in crystallinity and purity degree. The primary action mechanisms of CA confirmed were the long-term ability for further hydration to occur, the CH recrystallization, and the conversion of lower to higher thermal stability phases. Chemical and physical mechanisms of CAs are related to their surface area increase and their chemical nature, mainly composed of limestone. These characteristics confer with CA, the ability to act as a nucleation and precipitation stimulator to form new products.
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Abbreviations
- C:
-
CaO
- S:
-
SiO2
- A:
-
Al2O3
- F:
-
Fe2O3
- \({\bar{\text{S}}}\) :
-
SO3
- \({\bar{\text{C}}}\) :
-
CO2
- H:
-
H2O
- ACH:
-
Aluminate calcium hydrate
- AFm:
-
Monosulfoaluminate (C4A\({\bar{\text{S}}}\)H12)
- AFt:
-
Ettringite (C6A\({\bar{\text{S}}}\)3H22)
- CaCO3 :
-
Calcium carbonate
- C–A–S–H:
-
Calcium–aluminosilicate–hydrate
- CH:
-
Portlandite or calcium hydroxide
- C–S–H:
-
Calcium–silicate–hydrate
- Hca:
-
Hemicarboaluminate (C4A\({\bar{\text{C}}}\)0.5H12)
- Mca:
-
Monocarboaluminate (C4A\({\bar{\text{C}}}\)H11)
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Acknowledgements
This study was financed in part by the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—Brasil (CAPES)—Finance Code 001. The support of Brazilian funding agencies CNPq—Conselho Nacional de Desenvolvimento Cientifico e Tecnológico, FAPERJ—Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, and FINEP—Empresa Brasileira de Inovação e Pesquisa is also gratefully acknowledged. The authors would also like to thank Dr. Reiner Neumann (CETEM and National Museum/UFRJ, Brazil) for the quantitative XRD analyses and the anonymous reviewers for their careful review of the paper.
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de Souza Oliveira, A., Dweck, J., de Moraes Rego Fairbairn, E. et al. Crystalline admixture effects on crystal formation phenomena during cement pastes’ hydration. J Therm Anal Calorim 139, 3361–3375 (2020). https://doi.org/10.1007/s10973-019-08745-0
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DOI: https://doi.org/10.1007/s10973-019-08745-0