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Thermal analysis of the chemical weathering of chalk stone materials

S.-F. POP1,* , R.-M. ION1,2

Affiliation

  1. Department of Analysis, National Research & Development Institute for Chemistry and Petrochemistry ICECHIM, Spl. Independentei, 202, sect. 6, Bucharest, Romania
  2. Valahia University, Targoviste, 18-20 Blvd. Unirii., Targoviste, Romania

Abstract

Crystallization of soluble salts in the building materials, is considered today one of the most important decay process. The soluble salts are responsible for the crystallization process within the pores causing the stone damage. By DSC techniques is possible to detect the soluble salts arising from the chalk stone degradation, because the soluble salts are usually hydrated, so they undergo changes at low temperatures, less than 100 OC. Also, the sulphates, as the most aggreesive salts undergo phase transition under 600 OC. Taking into account the degradation temperature of soluble salts, in this paper it has been identified by DSC techniques: MgSO4 • 7H2O, MgSO4 • 6H2O, MgSO4 • H2O, Na2SO4, Na2SO4 • 10H2O, Na2SO4 • 7H2O. Can be observed that the Mg and Na sulphates are present in the chalk material, both in salt efflorescences and scarcely in patinas and crusts..

Keywords

Thermal analysis, Chalk stone, Weathering.

Submitted at: March 25, 2013
Accepted at: July 11, 2013

Citation

S.-F. POP, R.-M. ION, Thermal analysis of the chemical weathering of chalk stone materials, Journal of Optoelectronics and Advanced Materials Vol. 15, Iss. 7-8, pp. 888-892 (2013)