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On the quantitative thermogravimetric analysis of calcite content in hydrated cementitious systems

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Abstract
Calcite is a compound that is present in hydrated cementitious materials when carbonation of portlandite occurs or when limestone constituents are used. The quantification of its content in cementitious systems is then frequently necessary. Thermogravimetry (TG) measures the change in mass of a material (as a function of time) over a temperature range using a predetermined heating rate. It can be applied to estimate calcite content in the hydrated cement system, considering the temperature range at which it decomposes and releases carbon dioxide. However, the quantification is not easy because the onset of this decomposition is a function of many variables. The tangential method over the TG signal or the integration method over the derivative TG curve (DTG) are usually used to discount the background over the temperature range at which calcite decomposes. However, consistent underestimation of compounds is frequently described. The reasons for this are unclear and some hypothesis are discussed in this paper. Additionally, experimental quantitative TG of cement paste and aggregate containing calcite and diluted with low contents of analytical calcite are compared with the expected contents, as a calibration method regarding calcite content in the samples is given to improve the reliability of the results.
Keywords
Quantitative analysis, thermogravimetry, calcite

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Chicago
Villagran Zaccardi, Yury, Hugo Eguez Alava, Klaartje De Buysser, and Nele De Belie. 2017. “On the Quantitative Thermogravimetric Analysis of Calcite Content in Hydrated Cementitious Systems.” In Durability of Building Materials and Components (XIV DBMC), ed. Geert De Schutter, Nele De Belie, Arnold Janssens, and Nathan Van Den Bossche, 1–6. Paris (France): RILEM Publications.
APA
Villagran Zaccardi, Y., Eguez Alava, H., De Buysser, K., & De Belie, N. (2017). On the quantitative thermogravimetric analysis of calcite content in hydrated cementitious systems. In Geert De Schutter, N. De Belie, A. Janssens, & N. Van Den Bossche (Eds.), Durability of Building Materials and Components (XIV DBMC) (pp. 1–6). Presented at the 14th International Conference on Durability of Building Materials and Components (XIV DBMC), Paris (France): RILEM Publications.
Vancouver
1.
Villagran Zaccardi Y, Eguez Alava H, De Buysser K, De Belie N. On the quantitative thermogravimetric analysis of calcite content in hydrated cementitious systems. In: De Schutter G, De Belie N, Janssens A, Van Den Bossche N, editors. Durability of Building Materials and Components (XIV DBMC). Paris (France): RILEM Publications; 2017. p. 1–6.
MLA
Villagran Zaccardi, Yury, Hugo Eguez Alava, Klaartje De Buysser, et al. “On the Quantitative Thermogravimetric Analysis of Calcite Content in Hydrated Cementitious Systems.” Durability of Building Materials and Components (XIV DBMC). Ed. Geert De Schutter et al. Paris (France): RILEM Publications, 2017. 1–6. Print.
@inproceedings{8557593,
  abstract     = {Calcite is a compound that is present in hydrated cementitious materials when
carbonation of portlandite occurs or when limestone constituents are used. The quantification of its
content in cementitious systems is then frequently necessary.
Thermogravimetry (TG) measures the change in mass of a material (as a function of time) over a
temperature range using a predetermined heating rate. It can be applied to estimate calcite content in
the hydrated cement system, considering the temperature range at which it decomposes and releases
carbon dioxide. However, the quantification is not easy because the onset of this decomposition is a
function of many variables. The tangential method over the TG signal or the integration method
over the derivative TG curve (DTG) are usually used to discount the background over the
temperature range at which calcite decomposes.
However, consistent underestimation of compounds is frequently described. The reasons for this are
unclear and some hypothesis are discussed in this paper. Additionally, experimental quantitative TG
of cement paste and aggregate containing calcite and diluted with low contents of analytical calcite
are compared with the expected contents, as a calibration method regarding calcite content in the
samples is given to improve the reliability of the results.},
  author       = {Villagran Zaccardi, Yury and Eguez Alava, Hugo and De Buysser, Klaartje and De Belie, Nele},
  booktitle    = {Durability of Building Materials and Components (XIV DBMC)},
  editor       = {De Schutter, Geert and De Belie, Nele and Janssens, Arnold and Van Den Bossche, Nathan},
  isbn         = {978-2-35158-159-9},
  keyword      = {Quantitative analysis,thermogravimetry,calcite},
  language     = {ace},
  location     = {Ghent},
  pages        = {1--6},
  publisher    = {RILEM Publications},
  title        = {On the quantitative thermogravimetric analysis of calcite content in hydrated cementitious systems},
  year         = {2017},
}