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http://dx.doi.org/10.4334/JKCI.2002.14.6.973

Setting Assessment of Hogh Strength Concrete Using the Ultrasonic Pulse Velocity Monitoring  

이회근 (성균관대학교 토목환경공학과)
이광명 (성균관대학교 토목환경공학과)
Publication Information
Journal of the Korea Concrete Institute / v.14, no.6, 2002 , pp. 973-981 More about this Journal
Abstract
Recently, the use of high strength concrete (HSC) has increased dramatically md however, few studies have been conducted on the early-age properties of HSC such as setting. The penetration resistance test (specified by KS F 2436) that is the standard test method for determining initial and final setting times of concrete, may not be appropriate for HSC because of the high viscosity of the mortar mixture. To address this issue, an ultrasonic pulse velocity (UPV) monitoring system was used to investigate the setting behavior of mortar and concrete. The experimental study was carried out to measure the UPV's of mortars and concretes having various water/binder ratios (W/B) and various fly ash replacement levels, during the first 24 hours of testing. Test results showed that the UPV in concrete was developed faster than that of mortar with the same W/B, and that of ordinary concrete was greater than that of fly ash concrete. Typical values of UPV were suggested that correspond to the initial and final setting times, based on following criteria: (1) the penetration resistance method; (2) the instant when the UPV begins to develop; and (3) the instant when the UPV development rate is maximum. The method and UPV monitoring device used in this study is promising for the setting assessment of concrete, particularly for HSC.
Keywords
high strength concrete; setting time; ultrasonic pulse velocity; penetration resistance; fly ash;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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