Читать книгу Monument Future - Siegfried Siegesmund - Страница 382

The stone samples used in this research come from a Gallo-Roman temple which is part of the greater archaeological complex of Vaux-de-la-Celle located in the bottom of a valley at 60 km at the north west of Paris.

Figure 1: Archaeological site location.

The main structures of this archaeological site (theatre, sanctuary, basins…) were erected during the 2nd century A. D. (Vermeersch, 2009). The particular hydrogeological context characterizing this archaeological site is the presence of a water table that appears to be at or near the ground surface level in the lower topographical area of the valley where the sanctuary complex is erected (BRGM, 2531974). Since the foundations of the Temple might be in direct contact with the ground water, the erected parts of the structure are affected by capillary rise phenomena. Thus, from all major structures it has been chosen to analyze the limestone material from the Temple, which is the most representative building material of the walls from the architectural complex constituting the sacred area.

In order to understand the flow properties of the water through the porous media the petrophysical properties have been characterized (porosity, permeability and pore size distribution). Obtained results are presented in the table 1 and in the figure 2.

Table 1: Limestone petrophysical properties results.

Limestone petrophysical properties
Total porosity	41.9 ± 2.4 %
48 h porosity	33.3 ± 2.8 %
Hg porosity	40.1 ± 2.8 %
Air permeability	2.5 ± 0.6 × 10–12 m2
Water permeability	5 ± 3.8 × 10–13 m2
Water absorption	1.83 kg/m2min0.5

Figure 2: Pore size distribution of the limestone sample.

The limestone samples from the temple are characterized by a high porosity and permeability and a bimodal pore size distribution showing a major peak corresponding to a macropore radius of 10 µm.