A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Use of sonic and GPR tests to control the effectiveness of grout injections of stone masonry
Several NDT methods were used before and after the injections to test the potential of these methods in validating the effectiveness of the repair interventions. Sonic velocity was measured horizontally in transmission mode between the shortest sides. Surface measurements were also performed both horizontally and vertically on one of the longer sides to compare this testing geometry with the more conventional transmission geometry (not always applicable on real situations). According to the results, sonic measures turned out to be sensitive to the effects of grout injection on multiple leaf stone masonry. Applying them before and after the injection allows to estimate whether the grout is diffused inside the masonry. As expected, a remarkable velocity increase was generally observed as a result of the injections. The tests showed the importance of these measures to improve the injection technique and to control the penetration and diffusion of the grout during the works on site. In fact, they are enough simple to carry out and allow to gain data nearly immediately; therefore they can be used on site to determine how an injection is being developed and try to correct when some anomalies are evidenced. High frequency radar measurements can be used in order to qualify the material that constitutes the wall in order to optimize the choice of the position of the points of injection. It helps in discriminating between the zones of the masonry interested by macro fractures and voids, those characterized by smaller, diffuse fractures and areas of compact material so to better program the drilling positions.
Use of sonic and GPR tests to control the effectiveness of grout injections of stone masonry
Several NDT methods were used before and after the injections to test the potential of these methods in validating the effectiveness of the repair interventions. Sonic velocity was measured horizontally in transmission mode between the shortest sides. Surface measurements were also performed both horizontally and vertically on one of the longer sides to compare this testing geometry with the more conventional transmission geometry (not always applicable on real situations). According to the results, sonic measures turned out to be sensitive to the effects of grout injection on multiple leaf stone masonry. Applying them before and after the injection allows to estimate whether the grout is diffused inside the masonry. As expected, a remarkable velocity increase was generally observed as a result of the injections. The tests showed the importance of these measures to improve the injection technique and to control the penetration and diffusion of the grout during the works on site. In fact, they are enough simple to carry out and allow to gain data nearly immediately; therefore they can be used on site to determine how an injection is being developed and try to correct when some anomalies are evidenced. High frequency radar measurements can be used in order to qualify the material that constitutes the wall in order to optimize the choice of the position of the points of injection. It helps in discriminating between the zones of the masonry interested by macro fractures and voids, those characterized by smaller, diffuse fractures and areas of compact material so to better program the drilling positions.
Use of sonic and GPR tests to control the effectiveness of grout injections of stone masonry
Die Anwendung akustischer und Bodenradar Prüfungen zur Kontrolle der Zementierung von Steinmauern
Anzani, A. (author) / Binda, L. (author) / Lualdi, M. (author) / Tedeschi, C. (author) / Zanzi, L. (author)
2006
7 Seiten, 13 Bilder, 1 Tabelle, 10 Quellen
Conference paper
Storage medium
English
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