PARTIE 2 - Icomos

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Theme 2 Session 3 TABLE 3. Mortar components and fresh mortar compositions Eco-plasters revive the plasterwork techniques of the past Mortar/Author Components Weight (g) W/B Ratio (*) B/Aggreg. Ratio Cennini’s Render Rondelet’s Stucco III Leitão’s Stucco I (Floating Coat) Leitão’s Setting Coat Leitão’s Escaiola Lime Putty 1046 0,82 1 Lime Putty : White River Sand Fines 2370 2 River Sand Water - Lime Putty 2092 1,03 1 Lime Putty: Marble Dust 643 1 Marble Dust Water 250 Lime Putty 448 0,80 1 Lime Putty: Browning Plaster 239 1 Browning Plaster: 4 Limestone Fines
Theme 2 Session 3 Eco-plasters revive the plasterwork techniques of the past EN 1015-3:1999, with the reference 175 mm ± 10 mm. The value found was 185 mm. This proposal mortar was inspired on the “Escaiola” mortar, with substitution of 100% of river sand by limestone filler. A minimum of six prisms of 4x4x16cm for every seven mortars (Cennini’s Render; Rondelet’s Stucco III; Leitão’s Stucco I / Floating Coat; Leitão’s Setting Coat; Leitão’s Escaiola; Leitão’s Scagliola; Stucco II/ Proposal), were submitted to laboratory tests. After 90 days, mechanical tests such as flexural and compressive strength and dynamic modulus of elasticity according EN 1015-11:1999 or EN 13279-2:2004, and also resistance to capillary water absorption using EN 1015-18:2002 were performed. The dimensional and weight variations were measured 90 days after demoulding. Table 3 shows the mortar components and the mortar composition. 3.2.1. Shrinkage and Bulk Density Shrinkage and expansion were measured in the three axial dimensions and in volume of 90 days age prisms. The average values of seven specimens are shown in Table 4 and Figure 8. The maximum shrinkage observed is in mortars with marble dust and limestone fines (essentially Rondelet’s Stucco III and Leitão’s Escaiola) and the lowest shrinkage in mortars with sand (Cennini’s Render). The Stucco II, with substitution of 100% of river sand fines of Leitão’s Escaiola by limestone filler, has inferior shrinkage values. The expansion is observed in mortars with gypsum (Leitão’s Setting Coat and Scagliola). Regarding bulk density (Fig. 9), the superior values are of those mortars with standard sand (Cennini’s Render and Leitão’s Escaiola), in comparison with the mortars with marble or limestone fillers (Stucco I (Floating Coat), Stucco II (Proposal), Rondelet’s Stucco III). Scagliola and Setting Coat, with gypsum, are the lightest - in weight. TABLE 4. Experimental results at 90 days (in 16 cm x 4 cm x 4 cm prismatic specimens) Mortar Water / Binder Ratio Bulk Density (Kg/m3) Volume Variations (%) Dynamic E-Modulus (MPa) Flexural Strength (N/mm2) Compres. Strength (N/mm2) Coefficient of Water Absorb. (Kg/ m2.min0,5) 10-90 min Cennini’s Render W/B = 0,82 1.651,5 Shrinkage 97,4 3.538,4 0,46 1,18 1,41 Rondelet’s Stucco III W/B = 1,03 1.280,6 Shrinkage 66,9 7.910,8 0,15 2,15 3,13 Leitão’s Stucco I (Floating Coat) W/B = 0,80 1.548,6 Shrinkage 95,2 3.162,7 0,93 2,1 2,43 Leitão’s Setting Coat W/B = 0,81 780,5 Expansion 101,7 1.537,0 1,47 2,54 8,18 Leitão’s Escaiola W/B = 1,25 1.663,3 Shrinkage 87,1 4.484,5 0,73 1,77 1,97 Leitão’s Scagliola W/B = 0,74 754,2 Expansion 109,5 1.705,7 1,9 1,3 2,93 Stucco II/ Proposal W/B = 1,25 1.537,7 Shrinkage 91 3.361,1 0,87 2,2 2,42 448 LE PATRIMOINE, MOTEUR DE DÉVELOPPEMENT HERITAGE, DRIVER OF DEVELOPMENT
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THEME 2 introduction Président de
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Theme 2 Session 1 ARTISANAT, METIER
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Theme 2 Session 2 La pierre naturel
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Theme 2 Session 2 Le patrimoine bâ
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PARTIE 2 - Icomos

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