Measurement of setting process of cement pastes using non-destructive ultrasonic shear wave reflection technique

Trtnik, Gregor (author), Valič, Marko (author), Turk, Goran (author)

In this paper a new setup for measuring, setting and hardening process of cementitious materials, using a non-destructive ultrasonic shear wave reflection technique and design with the objective to be easily used in-situ, is described. Using the developed setup, the measurements can be performed by slight deepening of a measuring head into a paste in a mold or by placing the paste into a mold fixed on a measuring head. To test the proposed methodology, cement pastes with different compositions were prepared and exposed to different curing temperatures. Significant differences in the evolution of a change of a shear wave reflection coefficient Δr in time were observed, indicating the ability of the method to monitor setting process of cement pastes. Moreover, some interesting phenomena in the solidification process of the materials can be identified. A linear relationship between development of Δr and penetration resistance dP values in time was found, allowing development of a simplified procedure to determine both initial and final setting times of the material.

• Language: English
• Keywords: cement paste, ultrasonics, shear wave, setting, wave reflection method
• Typology: 1.01 - Original Scientific Article
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Year: 2013
• Publisher: Elsevier
• Number of pages: Str. 65-75
• Numbering: Letn. 56, Letn. 56
• UDC: 532:691
• ISSN on article: 0963-8695
• DOI: 10.1016/j.ndteint.2013.02.004
• COBISS.SI-ID: 6202721
• Publication date in RUL: 10.07.2015

Record is a part of a journal

• Title: NDT & E International
• Shortened title: NDT E int.
• Publisher: Butterworth-Heinemann
• ISSN: 0963-8695
• COBISS.SI-ID: 12515845

Secondary language

• Language: English
• Keywords: cementna pasta, ultrazvok, strižni valovi, vezanje cementa, metoda odboja valov