Visual Monitoring Method on Fresh Concrete Vibration

다국어 초록 (Multilingual Abstract)

An integrated visual monitoring system to determine trajectory and duration on each vibrating motion of vibrator during concreteplaced on construction site was introduced, which could graphically display vibrating status of fresh concrete. Defects on concreteplacing process such as missed vibration, insufficient vibration, or excess vibration could be quantifiably assessed, and therefore,precise and suitable remedy could be offered timely. The system consisted of four functional parts, namely, vibrating trajectoryspatial coordinate collected subsystem, vibrating duration-collected subsystem, data process subsystem, and real-time display andassesses subsystem of vibrating status. The principle of operation was explained in this article. Firstly, accurate signals combinedspatial coordinates were achieved by dual-satellite systems, e.g., GPS (Global Position System) and GLONASS (Global NavigationSatellite System), with RTK (Real Time Kinematics) mode and, duration of each vibration from start to end was determined byelectrode device, respectively. Secondly, the wireless signals were sent to the terminal computer via MCC (Mono-Chip Computer)integrated. Finally, the worked status of vibrator on terminal was displayed simultaneously supported by assessment programm oncompacting concrete. Tests results from outdoor and application in-situ proved that the system could monitor the vibration process inreal-time reliably and quantifiably while fresh concrete was placed, and an innovative informationaized method might be realized.

참고문헌 (Reference)

1 Hover, K., "Vibration tune-up" 23 (23): 30-35, 2001

2 Soutsos, M., "Vibration of fresh concrete: Experimental set-up and preliminary results" University of Dundee 1999

3 Taylor, R. W., "The compaction of concrete by internal vibratorsan investigation of the effects of frequency and amplitude" 42 (42): 3-27, 1976

4 Ren, H., "The GPS-RTK satellite positioning technology and its application in construction of large scale bridge" 2011

5 American Concrete Institute, "State-of-the-art report on behavior of fresh concrete during vibration" 2008

6 Banfill, P. F. G., "Rheology and vibration of fresh concrete: Predicting the radius of action of poker vibrators from wave propagation" 41 (41): 932-941, 2011

7 Lu, M., "Positioning and tracking construction vehicles in highly dense urban areas and building construction sites" 16 (16): 647-656, 2007

8 Mekik, C., "Multipath effects in RTK GPS and a case study" 42 (42): 231-240, 2010

9 EI-Mowafy, A., "Machine automation using RTK GPS positioning" 1 : 1-6, 2009

10 Ersoy, S., "Investigations on the consolidation effect of immersion vibrators" Technische Hochschule Aachen 1962

11 Forssblad, L, "Investigations of internal vibration of concrete" 33 (33): 452-454, 1966

12 Kozlov, D., "Instant RTK cm with low cost GPS and GLONASS C/A receivers" 45 (45): 137-147, 1998

13 Peyret, F., "High-precision application of GPS in the field of real-time equipment positioning" 9 (9): 299-314, 2000

14 Roberts, G. W., "Global positioning system aided autonomous construction plant control and guidance" 8 (8): 589-595, 1999

15 Olsen, M. P. J., "Energy requirements for consolidation of concrete during internal vibration" 96 (96): 179-196, 1987

16 Chan, Y. W., "Effect of consolidation on bond of reinforcement in concrete of different workabilities" 100 (100): 294-301, 2003

17 Michael, F. P., "A unique experimental method for mornitoring aggregate settlement in concrete" 30 (30): 809-816, 2000

18 Safawi, M. I., "A study on the applicability of vibration in fresh high fluidity concrete" 35 (35): 1834-1845, 2005

19 Popovics, S., "A device for recording the consolidation of fresh concrete by vibration" 7 (7): 67-70, 1985

20 Li, C. C., "A GIS-based system for tracking pavement compaction" 5 (5): 51-59, 1996