Using ultrasonic wave reflection to monitor false set of cement paste. (November 2017)

• Record Type: Journal Article
• Authors: Chung, Chul-Woo; Suraneni, Prannoy; Popovics, John S.; Struble, Leslie J.
• Is Part Of: Cement & concrete composites. Volume 84(2017)
• Page Start: 10
• Page End: 18
• Publication Date: 2017-11
• Subjects: Secondary gypsum -- False set -- Ultrasonic wave reflection -- Penetration resistance -- Set; Composite-reinforced concrete -- Periodicals; Concrete -- Periodicals; Composite materials -- Periodicals; Composites de ciment -- Périodiques; Béton -- Périodiques; Composites -- Périodiques; Béton léger -- Périodiques; Cement composites; Composite materials; Composite-reinforced concrete; Concrete; Lightweight concrete; Periodicals; Electronic journals; 620.135
• DOI: 10.1016/j.cemconcomp.2017.08.010
• Languages: English
• ISSNs: 0958-9465

Abstract

Abstract: The standard mechanical penetration approach for monitoring cement paste stiffening (Vicat needle method, ASTMC191 ) does not distinguish responses associated with false set of cement paste caused by secondary gypsum formation. The objective of this research is to determine whether ultrasonic wave reflection, using a testing set up with high measurement sensitivity, could be used to monitor false set of cement paste. Penetration resistance, P-wave, and S-wave reflection coefficients were measured on cement pastes with water-to-cement ratio 0.5. The S-wave reflection coefficient showed a sharp and abrupt linear drop associated with secondary gypsum formation, thereby indicating that S-wave ultrasonic wave reflection can be used to monitor false set of cement pastes. False set could not be distinguished in penetration resistance or P-wave UWR test data.