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How to assess the efficiency of a stone consolidant ?. -The example of the Bologna Cocktail-. Claire Moreau University of Reims, France. Products. Bologna Cocktail (Nonfarmale, 1976) (BC): Paraloid B72 Dry Film 104 Solvent mixture ( Acetone, Butanone, Toluene, Butanol )
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How to assess the efficiency of a stone consolidant? -The example of the Bologna Cocktail- Claire Moreau University of Reims, France
Products • Bologna Cocktail (Nonfarmale, 1976) (BC): Paraloid B72 Dry Film 104 Solvent mixture (Acetone, Butanone, Toluene, Butanol) • Silicic Acid Ester (SAE): Remmers 300E
Before ageing (km/s) After ageing (km/s) Width 5.7 2.2 Length 6.4 2.5 Height 5.8 2.1 Ultrasonic velocities Artificial weathering Marble after thermal ageing (500ºC)
Methods for the evaluation of the penetration depth of a consolidant Iodine staining Microprobe analysis Microdrop test Ultrasonic velocity measurement Drilling resistance measurement Bi-axial flexural strength measurement
Bologna Cocktail -> 2.7 mm SAE -> 12.5 mm Iodine Staining(Kumar and Ginell, 1997)
BC: Hydrophobic surface SAE: Less hydrophobic, presence in depth (~12.5mm) Untreated range Microdrop test
Untreated range Ultrasonic Profiles Decrease of the velocity along the depth Better penetration of SAE than BC
Derivative of the velocity on depth(DV/Dx)as a function of depth BCC, BC5+SV, SAE: Homogeneous profiles
Drilling Resistance(Tiano and al., 2000) SAE: Higher drill resistance in the first 10mm
Load F Slice (thickness h, radius R) Bi-axial flexural strength(Wittmann and Prim, 1983)
Untreated range Bi-axial flexural strength profiles Better penetration of SAE than BC
Derivative of biaxial flexural strengthsbzon depth(Dsbz/Dx) (N/mm³) as a function of depth Non-homogeneous profiles
Strength – E-modulus Linear correlation for a substrate