Study of ancient dolomitic mortars of the church of Santa Maria de Zamarce in Navarra (Spain): comparison with simulated standards

被引：33

作者：

Montoya, C ^{[1
]}

Lanas, J ^{[1
]}

Arandigoyen, M ^{[1
]}

Navarro, I ^{[1
]}

Casado, PJG ^{[1
]}

Alvarez, JI ^{[1
]}

机构：

[1] Univ Navarra, Dept Chem & Soil Sci, E-31080 Pamplona, Spain

来源：

THERMOCHIMICA ACTA | 2003年 / 398卷 / 1-2期

关键词：

dolomitic mortars; thermal analysis; hydromagnesite; self-generated atmosphere; X-ray diffraction;

D O I：

10.1016/S0040-6031(02)00321-0

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Ten ancient mortars from the Church of Santa Maria de Zamarce (Navarra, Spain) have been studied by means of chemical analysis, X-ray diffraction and simultaneous thermogravimetric and differential thermal analysis (TGA-DTA). All the studied samples have shown to be dolomitic mortars. Sixteen simulated standards of typically present compounds in dolomitic mortars were prepared and studied. Particularly the occurrence of hydrated magnesium carbonate hydroxide (hydromagnesite (HY), Mg-5(CO3)(4)(OH)(2).4H(2)O) as result of the setting of dolomitic mortars is discussed. No HY has been checked in mortars from Santa Maria de Zamarce. However, TGA-DTA studies have clearly shown the thermal decomposition of HY in the prepared mixtures, specially the exothermic peak at 500degreesC. The experimental conditions in TGA-DTA, with a high CO2 pressure around the sample, seem to play an important role in the occurrence of this phenomenon. Suitable experimental conditions for thermal studies of these materials have been indicated. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：107 / 122

页数：16

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