Impacts of anisotropy coefficient and porosity on the thermal conductivity and P-wave velocity of calcarenites used as building materials of historical monuments in Morocco
Abstract
It is essential to study the porosity, thermal conductivity, and P-wave velocity of calcarenites, as well as
the anisotropy coefficients of the thermal conductivity and P-wave velocity, for civil engineering, and
conservation and restoration of historical monuments. This study focuses on measuring the thermal
conductivity using the thermal conductivity scanning (TCS) technique and measuring the P-wave ve-
locity using portable equipment. This was applied for some dry and saturated calcarenite samples in the
horizontal and vertical directions (parallel and perpendicular to the bedding plane, respectively). The
calcarenites were selected from some historical monuments in Morocco. These physical properties were
measured in the laboratory to find a reliable relationship between all of these properties. As a result of
the statistical analysis of the obtained data, excellent linear relationships were observed between the
porosity and both the thermal conductivity and porosity. These relationships are characterized by
relatively high coefficients of determination for the horizontal and vertical samples. Based on the
thermal conductivity and P-wave velocity values in these two directions, the anisotropy coefficients of
these two properties were calculated. The internal structure and the pore fabric of the calcarenite
samples were delineated using scanning electron microscopy (SEM), while their chemical and mineral
compositions were studied using the energy dispersive X-ray analysis (EDXA) and X-ray diffraction (XRD)
techniques.
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