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<p><i>Dolomia Policroma</i> (or <i>Breccia di Poggiorsini</i>) is a sequence of microcrystalline dolomites from the Murge region (Apulia, Southern Italy). It is characterized by a distinctive brecciated pattern and a wide chromatic range (from red to yellow, yellow-brown, and olive-brown) defining four commercial varieties: <i>Rosso Pompeiano</i>, <i>Giallo Antico</i>, <i>Mélange</i>, and <i>Morato</i>. These varieties are composed of approximately 95 wt% carbonates, of which about 86% is dolomite. Their vivid coloration, ornamental appeal, and resemblance to rare decorative stones support their application in both historical monuments and contemporary high-end architecture. In Mediterranean urban coastal environments, colored “marbles” such as <i>Dolomia Policroma</i> are subject to complex degradation driven by the synergistic action of acid deposition, salt crystallization due to marine aerosol, and thermally induced stresses from temperature fluctuations. This study presents an in-depth characterization of <i>Dolomia Policroma</i>, focusing on its petrophysical and mechanical performance for use in conservation and architectural applications. Standard and advanced destructive and non-destructive techniques were employed. Thermal conductivity, diffusivity, and specific heat were measured on dry samples from 20&#xa0;°C to 200&#xa0;°C using the experimental “cut-core” transient method. Uniaxial compressive strength, indirect tensile strength, flexural strength, and secant modulus were obtained via hydraulic testing devices and correlated with Schmidt hammer rebound values. Key findings reveal that despite their mechanical strength, all varieties show marked structural susceptibility to damage from thermo-hydric cycling, notably associated with pore size distribution and effective porosity. The material should therefore be utilized primarily in indoor settings to mitigate damage caused by salt crystallization and cyclical exposure.</p>

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Petrophysical and mechanical properties of Dolomia policroma, a precious stone from the Murge region (Apulia, Southern Italy)

  • 期刊论文

  • 发表日期：

    2025年11月26日

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  • Gioacchino Francesco Andriani

摘要

Dolomia Policroma (or Breccia di Poggiorsini) is a sequence of microcrystalline dolomites from the Murge region (Apulia, Southern Italy). It is characterized by a distinctive brecciated pattern and a wide chromatic range (from red to yellow, yellow-brown, and olive-brown) defining four commercial varieties: Rosso Pompeiano, Giallo Antico, Mélange, and Morato. These varieties are composed of approximately 95 wt% carbonates, of which about 86% is dolomite. Their vivid coloration, ornamental appeal, and resemblance to rare decorative stones support their application in both historical monuments and contemporary high-end architecture. In Mediterranean urban coastal environments, colored “marbles” such as Dolomia Policroma are subject to complex degradation driven by the synergistic action of acid deposition, salt crystallization due to marine aerosol, and thermally induced stresses from temperature fluctuations. This study presents an in-depth characterization of Dolomia Policroma, focusing on its petrophysical and mechanical performance for use in conservation and architectural applications. Standard and advanced destructive and non-destructive techniques were employed. Thermal conductivity, diffusivity, and specific heat were measured on dry samples from 20 °C to 200 °C using the experimental “cut-core” transient method. Uniaxial compressive strength, indirect tensile strength, flexural strength, and secant modulus were obtained via hydraulic testing devices and correlated with Schmidt hammer rebound values. Key findings reveal that despite their mechanical strength, all varieties show marked structural susceptibility to damage from thermo-hydric cycling, notably associated with pore size distribution and effective porosity. The material should therefore be utilized primarily in indoor settings to mitigate damage caused by salt crystallization and cyclical exposure.