4C-Rheometer, User`s Manual - Danish Technological Institute
Contents
1. The spacial calibration between field of view and the pixels on the camera CCD has been carried out on your 4C Rheomeiter In fact all preferred settings are found on the PC s desktop as DANISH TECHNOLOGICAL INSTITUTE screendumps However should the camera be moved up or down a new spacial calibration has to be performed i e the field of view must be measured with a ruler and the values entered into the system setup as Board Width and Board Height see page 8 The lifting speed of the cone is adjusted by turning the upper left hand side button on the device shown in Figure 2 The speed should by 7cm s which is achieved by turning the button all the way to the right maximum speed Figure 2 The speed is adjusted on the button indicated by the yellow circle Test that the large red emergency stop button is working and that the lifting arm moves up and down when either of the two green buttons are pressed see Figure 3 Emeraencv button Up Down Figure 3 Position of emergency button red and buttons for moving the lifting arm up and down green DANISH TECHNOLOGICAL INSTITUTE Software When the 4C Rheometer software is launched the user interface shown in Figure 4 is displayed The interface consists of a Video Analysis area left side and a Results area right side Video Analysis Results 800 Slump Flow mm 40 50 J 10 30 Time s Den2. free space between the lifting arm and the cone Make sure not to lift the cone so that paste will run between the cone and the base plate e Make sure that part of the cone is visible to the left in the live video image in Preview mode Close the preview window e Make sure that all parameters are correctly selected in Setup e Fill the cone with concrete by pouring the concrete straight down the centre of the cone as quickly as possible e Make sure that there is no concrete in the camera s field of view e Click START ANALYSIS and type in the desired file name By clicking Open the cone is lifted and the analysis begins During analysis make sure that no objects are interfering with the camera s field of view e After analysis measure the actual slump flow and type it in the measured slump flow box and click RECALCULATE This will ensure the most accurate determination of the rheological parameters e To save the analysis results click SAVE DATA e Clean cone and base plate with water and wipe them off with a towel e Lower the lifting arm and reposition the cone e The 4C Rheometer is ready for a new analysis 10
3. User s Manual 4C Rheometer Version 2 0 Danish Technological Institute 04 07 2008 DANISH TECHNOLOGICAL INSTITUTE 4C Rheometer version 2 0 The information in this document is subject to change without notice and does not represent a commitment on the part of Danish Technological Institute The software described is furnished under a license or nondisclosure agreement No part of this manual may be reproduced or transmitted in any form or by any means electronic or mechanical including photocopying and recording for any purposes other than the purchaser s personal use without the written permission of Danish Technological Institute Warning Do not attempt to open the 4C Rheometer control unit PC the monitor lifting unit or any other part of the 4C Rheometer system Do not try to format re partition or in any other way alter the contents or structure of the hard disk of the control unit When the lifting unit is in motion keep your hands away Do not try to connect the 4C Rheometer system in any other way than what is described in the installation guide Do not touch or in other ways get in contact with the cords and connections on the back of the control unit when the system is connected to the electrical supply Warranty for the 4C Rheometer system will expire immediately if any of the above mentioned rules have been violated without written consent of Danish Technological Institute or any other damage on the 4C Rhe
4. ected If Setup is selected the screen will appear as in Figure 6 Rheo Avi Analysis la x Video Analysis Results Video Setup de FARMS Video Source Unibrain Fire i driver 7 IIDC Spec 1 3 compliant camera Y Zey CAMERA Camera View Properties Board Width mm 293 Gal Board Height mm 218 Image Analysis Threshold 0 255 2m 3 m Preroll Time s 05 E a Analysis Time s 40 ail E StripeWidth pixels 50 ANI properties Frame rate fps 15 m Image Width 640 E oe it 10 20 30 40 50 Cone lift time ms 2000 ij Time s Density 2 300 E Yield Stress Pa Plastic Viscosity Pa s Manual Slump Flow 0 fj mm Slump Flow mm Preview Analysis Setup _RECALCULATE gt T 500 g amp START ANALYSIS S SAVE DATA gt LOAD DATA Figure 6 Appearance of the user interface when the Setup tap is selected DANISH TECHNOLOGICAL INSTITUTE Under Setup it is possible to select values for the following parameters Board Width mm measured width of the field of view live image in the direction that the concrete flows the horizontal direction on the screen Board Height mm measured width of the field of view live image perpendicular to the direction that the concrete flows the vertical direction on the screen Threshold intensity cut off value During the video analysis eac
5. h frame is binarized i e the image is made to consist of only black and white pixels The threshold is the cut off intensity value below which all pixels are set to black intensity 0 and above which all pixels are set to white intensity 255 Under normal light conditions a threshold value of 120 will provide good results If the green bar shown during analysis of the video correctly defines the front of the concrete then the threshold value is set correct Preroll Time s time from video collection start to the cone is lifted The recommended value is 0 5s Analysis Time s duration of video collection The recommended value is 40s Stripe Width pixels number of pixels over which the average position of the concrete front is determined Recommended value is 50pixels Frame Rate 1 s number of frames per second in the video collected The value has to be 15s Image Width pixels number of pixels in the width direction The value should be 640pixels Image Height pixels number of pixels in the height direction The value should be 480pixels Cone Lift Time ms time during which the cone is lifted at a speed of 7cm s The preferred value is 2000ms An analysis is initiated by clicking the START ANALYSIS button and typing in the file name under which the video file avi will be saved followed by clicking Open The START ANALYSIS button should not be clicked when the live preview wi
6. ifting unit Fine adjustment to level the base plate can be made by adjusting the height of each of the three legs Place the Abrams cone on the lifting arm Mount the camera on the top arm of the lifting unit so that the camera is looking down on the base plate With the lifting unit now in position the chords and cables between the different units and to the power outlets should be connected The following connections should be made Figure 1 Connect the camera to the fire wire port on rear of the PC using the fire wire cable Connect the USB cable from the lifting unit to the PC Connect the monitor to the PC Connect the keyboard and the mouse to the PC control unit Ye S YS Connect all power supply chords to a power outlet When the above connections have been made the PC control unit should be powered up Use administrator and it service as login and password respectively K Figure 1 Left Camera in the blue circle mounted on top arm looking down towards the base plate Right Rear view of PC Green circle Lifting unit USB cable Yellow circle Camera fire wire cable Activate the preinstalled software by clicking the 4C Rheometer icon on the desktop Click the PREVIEW button and adjust the position of the camera so that a small part of the slump cone is visible to the left in the live preview image Adjust the focus and shutter of the camera The 4C Rheometer is now ready for operation
7. ndow is active as this will result in erroneous video acquisition The Results area In the Results area slump flow vs time is shown and the determined values for yield stress plastic viscosity slump flow and tso9 are displayed It is possible to type in the density of the concrete and the manually measured slump flow and recalculate the output parameters by clicking the RECALCULATE button Data is saved by clicking the SAVE DATA button Saved data files can be displayed by clicking the LOAD DATA button and selecting the appropriate file An example of the user interface after analysis is shown in Figure 7 The green bar indicates the width over which the average position red line of the concrete front is determined DANISH TECHNOLOGICAL INSTITUTE Rheo Avi Analysis x Videt Anahi i Slump Flow mm 8 2 40 Time s Density 230 Gaal Yield Stress 4 Pa Plastic Viscosity Pats Manual Slump Flow 577 mm Slump Flow Si mm RECALCULATE gt T 500 33 s D START ANALYSIS S SAVE DATA gt gt Loan pata Figure 7 Example of the 4C Rheometer user interface after analysis DANISH TECHNOLOGICAL INSTITUTE How to perform an analysis e Power up all units and launch the 4C Rheometer software e Make sure that cone and base plate are clean and dry e Using the up and down buttons on the side of the lifting unit position the lifting arm so that there is no or virtually no
8. ometer system caused by abuse or improper use Danish Technological Institute DANISH TECHNOLOGICAL INSTITUTE Table of Content About the 4C Rheometer system version 2 0 cccccesseeeseesenseeeeseeeeeeeeneeees 3 Installation of 4C Rheometer ccccccesecceeecenecneecesesenseenseeeneecnsesenseseees 4 SONWANE sorana Ae TE EEE AA E EAEE E EEEE a 6 How to perform an analysis cccccccceeseeeeeeseeneeenseenseenseeaseosseeaeeoneennseoaeenas 10 DANISH TECHNOLOGICAL INSTITUTE About the 4C Rheometer system version 2 0 The 4C Rheometer is an automated image analysis system performing determination of the Bingham rheological parameters yield stress and plastic viscosity of self compacting concrete SCC The 4C Rheometer system includes a control unit PC a 19 color LCD monitor a video camera a modified Abrams slump cone a cone lifting unit and a base plate 12mm thick 1000mm hardened glass with sand blasted surface The pixel resolution of the 4C Rheometer is roughly 0 500mm Following the video image analysis and data treatment analysis results and the raw video can be saved to the hard disk The 4C Rheometer operates in a MS Windows XP environment and does not require additional software installations DANISH TECHNOLOGICAL INSTITUTE Installation of 4C Rheometer The 4C Rheometer should be placed on a horizontal vibration free surface Place the base plate on the three rubber supports of the l
9. sity 2 300 E Yield Stress Pa Plastic Viscosity Pa s Manual Slump Flow 0 mm Slump Flow mm RECALCULATE gt T 500 i d START ANALYSIS je Ta SAVE DATA LOAD DATA Figure 4 The 4C Rheometer user interface The Video Analysis area In the Video Analysis area it is possible to shift between the Preview Analysis and Setup taps Under the Preview tap the live video image is shown if the large PREVIEW button is clicked Figure 5 shows good light settings and how the cone should be visible in the left hand side of the live video image Click the STOP button to deactivate the live preview Under the Analysis tap recorded videos can be reanalysed by activating the REANALYSE MOVIE button and selecting the video to be reanalysed DANISH TECHNOLOGICAL INSTITUTE Rheo Avi Analysis Video Analysis Results 2 TE a E A 10 30 40 50 Time s N Density 2 300 E Yield Stress I Pa Plastic Viscosity Pa s Litting Manual Slump Flow 0 jjmm Slump Flow mm Preview RECALCULATE gt T 500 rs amp START ANALYSIS S SAVE DATA gt LOAD DATA Figure 5 Appearance of the user interface when PREVIEW is activated under the Preview tap Good light settings and position of cone Under the Setup tap the parameters governing the video recording and analysis is sel
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