SP-540 type concrete shrinkage and expansion meter shrinkage meter and expansion meter wholesale price

Type concrete shrinkage and expansion meter Shrinkage and expansion meter shrinkage and expansion rate wholesale price
Usage editor
Used to measure the length (volume) change of concrete specimens under specified temperature and humidity conditions.
2. Instructions for use
Place the dilatometer on a flat work surface, then put the standard rod into the groove of the dilatometer bracket and the upper and lower probes. The method for calibrating the reference length is as follows: Press Press the key to display the indicator in the display window. Press the standard rod tightly with your fingers to make the standard rod contact the upper and lower probes and the bracket groove. At this time, a set of data will appear in the dial indicator display window. Then press the button, and the numbers in the display window will all be zero. , gently lift the dial indicator measuring rod, take out the standard rod, and the calibration is completed. Note that the relative position of the standard rod and the dilatometer must be fixed during each calibration, and should be recalibrated before each measurement.
Concrete shrinkage and expansion meter album (sheet)
Before measurement, clean the object to be measured and the probe of the measuring instrument, mark the object to be measured, and gently put the test object into the dilatometer. The upper and lower probes are in the groove of the bracket, with the marked side facing upward, facing the measurer. The direction and position must be fixed and consistent, and cannot be changed at will. Press the test body tightly with your hands to make the upper and lower probes contact the test body probe correctly. At this time, a set of numbers appears in the dial indicator display window, which is the measured value. Note that the length of each specimen should be measured repeatedly and its stable value should be taken.
3. Editing of operating procedures
Before measuring the deformation of the specimen, the measurement frame must be calibrated on the standard rod to align the dial indicator with the zero position (or write down the scale value of the dial).
Wipe both ends of the prepared specimen clean, then place it on the workbench, put the calibrated measuring frame on the specimen, and move the measuring frame left and right so that the top of the specimen is in line with the edge of the measuring frame. When the measuring head makes accurate contact, you can take a reading on the dial indicator and write down the scale value on the dial.
. If the experiment is not continuous or the experiment lasts for a long time, the measurement frame must be calibrated on the standard rod before testing
4. Calculation method editing
Shrinkage () * mm
In the formula: --- the reference length of the specimen maintenance time, in millimeters.
---The length of the specimen at each age.
―――Effective length.
According to different requirements, the shrinkage rate can be expressed in percentage or microns. If the specimen shrinks, add a sign before the calculation result, and if it expands, add a + sign.
The test results should be based on the two closest ones among the three specimens, and the calculated average value should be accurate to .mm
5. Editing of main technical indicators
Quasi-rod length
Standard rod expansion coefficient.℃
Displacement meter accuracy.
Displacement measurement range
Scope of application is suitable for concrete
Overall dimensions
Quality
6. Structure and Function Editor
This instrument consists of a base, a positioning column, an adjustable column, a dial indicator, a standard rod, etc.
The base is a steel structural component used to place concrete test blocks.
, positioning column, used for longitudinal and transverse positioning of the left end of the standard rod and concrete test block probe.
, the adjustable column has a prefabricated through hole for installing the dial indicator and a set screw to help position the dial indicator. The three through holes are respectively from the base datum plane, the hole from the base datum plane, the hole from the concrete test block used to measure the specifications to the base datum plane, and the concrete test block used to measure the specifications (since the test mold specifications are only available, it should be It is recommended to use the test mold shortening piece to make the concrete test block formed size).
, standard rod, as the reference length of the instrument. The standard rod has been installed on the standard rod shelf before leaving the factory. Please do not disassemble or assemble it at will to avoid affecting the accuracy of the center height of the standard rod. The words " and " on each side of the standard rod indicate that if the position is placed on the base datum plane, the center height of the standard rod will be,,.