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(1) Ternary: 30% white Danish cement, 25% Lime (powder), 45% natural pozzolan Petr. (<45 |X m), superplas-ticer 1%, water 80% of the solid phase of the grout

(2) NHL5-based grout: 100% NHL5 (St Astier), superplas-ticer 1%, water 80% of the solid phase of the grout

(1) Ternary: 30% white Danish cement, 25% Lime (powder), 45% natural pozzolan Petr. (<45 |X m), superplas-ticer 1%, water 80% of the solid phase of the grout

(2) NHL5-based grout: 100% NHL5 (St Astier), superplas-ticer 1%, water 80% of the solid phase of the grout strength and durability requirements (Table 1). Therefore, they were selected to be applied to six three-leaf stone wallettes, simulating the masonry of the upper parts of the monument. It has to be noted however that the hydraulic lime based grout presented a better sulphate resistance than the ternary one (Miltiadou -Fezans et al. 2007).

9.2 Construction and testing of wallettes

In order to estimate in the best possible way the mechanical characteristics of the masonry before and after grouting, considerable effort was devoted to the identification of the construction type of masonry. For this purpose, radar and endoscopy were applied in a systematic way. The in-depth geometry of the perimeter stone masonry was rather accurately identified (Vintzileou et al., 2004). As anticipated, both the lower and upper parts of the perimeter walls belong to the three-leaf masonry type, with varying widths of the leaves. Although both regions were examined, the investigation was concentrated mainly on the upper (more vulnerable) zone of masonry. In Figure 21 characteristic examples of vertical sections of the lower and upper zone of perimeter masonry are shown.

The materials characteristics (stones, bricks and mortars) being determined in the Laboratory on samples taken from the monument and the type of masonry being determined in-situ, an attempt was made to

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Figure 21. Vertical sections of lower (a) and upper zone (b).

Table 2. Basic mechanical properties of Wallettes before and after grouting.

Figure 21. Vertical sections of lower (a) and upper zone (b).

Figure 22. The walletes prepared for grouting.

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