MATERIALS

TEST SETUP

TEST SAMPLES

THERMAL TREATMENT

INVESTIGATION TECHNIQUE

REF.

Michelangelo’s David in Florance

5.16 m high nearly 6 ton three different path lengths of 60 mm, 70 mm and 80 mm

Natural Temperature variations and wetting-drying cycles

Ultrasonic (55 kHz) maximum depth 20 mm

[88]

Proconnesus marbleThasos Island/Greece

Graeco-Roman style and date to the Roman period

The piece is 99.1 cm high, 35 cm wide and 31.5 cm thick.

The height of the piece is 79 cm, width 56 cm, thickness39 cm.

The hight of the piece is 97 cm, width 41 cm, thickness 37 cm. 130 cm high, 63 cm wide and 33 cm thick.

89 high, 41 cm wide, 31 cm thick.

visible surface cracks

Ultrasonic (250 kHz)

Optical Microscopy

X-ray diffraction

for distances up to 20 cm

[89]

Neuer Garten, Potsdam/Germany, Prie born Marble obelisk

Square ground plan and narrows from the bottom up, height: 5.2 m, the faces of the profiled plinth are within 1.2 degrees off the vertical.

Prieborn marble cube 65 mm, to analyzer the progressive deterioration of this marble subsequently 60˚C, 90˚C, 150˚C, 200˚C heated and cooled down.

Ultrasonic (46 kHz)

Analyzer Microscope

[90]

The sculpture Mercury and Psyche from Reinhold Begas, Berlin/Germany

Marble cube edge length of 10 cm

Ultrasound Image, maximal penetration depth of 50 cm

X-Ray Diffraction, maximal penetration depth of 20 cm

[91]

Naturally sugaring marbles from Monumental Cemetery in Bologna/Italy

And Carrara marble

12 × 9 × 3 cm Rectangular

30 × 30 × 10 mm Prismatic

Samples were produced at 400˚C for 1 h.

Electron Microscopy

Mercury Intrusion Porosimetry

Ultrasonic (55 kHz)

[92]