Effects of the restoration mortar on chalk stone buildings

International Conference on Innovative Research - ICIR Euroinvent 2016

Ion, R.M.^1,2 ; Teodorescu, S.^3 ; Stirbescu, R.M.^3 ; Dulam, I.D.^3 ; Suic-Bunghez, I.R.^2 ; Bucuric, I.A.^3 ; Fierscu, R.C.^2 ; Fierscu, I.^2 ; Ion, M.L.^4

Valahia University, Materials Engineering Department, 13 Aleea Sinaia, Targoviste, Romania^1

ICECHIM, 202 Splaiul Independentei, Bucharest

060021, Romania^2

Multidisciplinary Scientific and Technologic Research Institute, 13 Aleea Sinaia, Targoviste, Romania^3

Valahia University of Targoviste, History Department, 13 Aleea Sinaia, Targoviste, Romania^4

关键词: Cement based material;    Combined techniques;    Cultural heritages;    FT-IR and Raman;    Mechanical degradation;    Natural cement;    Restoration mortars;    Stone buildings;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/133/1/012038/pdf
DOI  :  10.1088/1757-899X/133/1/012038

来源: IOP

【 摘 要 】

The monument buildings as components of cultural heritage are exposed to degradation of surfaces and chemical and mechanical degradation, often associated to soiling and irreversible deterioration of the building. In many conservative and restorative works, a cement-based mortar was used without knowing all the adverse effects of this material on the building. This paper deals with the study of the effects of natural cement used in restorative works in the particular case of the Basarabi-Murfatlar Churches Ensemble. Cement-based materials exposed to sulfate present in the chalk stone - gypsum (CaSO4.2H2O), can induce signs of deterioration, due to ettringite ([Ca3Al (OH)612H2O]2(SO4)32H2O) or thaumasite (Ca3[Si(OH)612H2O](CO3)SO4) formation. These phases contribute to strain within the material, inducing expansion, strength loss, spalling and severe degradation. Several combined techniques (XRD, EDXRF, ICP-AES, SEM, EDS, sulphates content, FT-IR and Raman analysis were carried out to put into evidence the effects of them on the building walls.