Читать книгу Monument Future - Siegfried Siegesmund - Страница 256

The marble statue of Soong Ching-ling stands in the memorial square of Soong Ching-ling cemetery in Shanghai, China. The statue has been inaugurated in 1984 and is a Chinese National Monument. Since 2014 many micro cracks appeared on the surface, especially on the head of the statue. To evaluate the deterioration 174condition of the statue and the depth of the cracks, non-destructive ultrasonic technology was applied. The deterioration state was tested by the USCT (Ultrasonic Computed Tomography) method and the depths of surface cracks were determined.

Based on the USCT, there were no penetrative severe cracks. The depth of the superficial cracks on top of the head was not more than 50 mm. However, a clearly deteriorated, shell-like zone with a thickness from 10 to 50 mm was found around the head. Fifteen micro cracks were detected and the depths of those cracks ranged from 0 to 68 mm. The results provided fundamental information to work out a preservation concept.

Keywords: Soong Ching-ling statue, dolomite marble, ultrasonic detection, USCT, cracks