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The cement mortar ratio meter is suitable for use in accordance with JC/T603-2004 “Cement mortar dry shrinkage test method”, JTGE30-2005 “Test method for cement and concrete in road construction”, T0511 regulations and JGJ70-2005. 90 Test Methods for Basic Performance of Structural Mortar, GB11972-89 Test method for drying shrinkage of air-entrained concrete, IOS14685 Gravel and crushed stone for construction, for determining the drying shrinkage of cement mortar and cement mortar samples at different age rates;
It is suitable for determining the high-precision rate of expansion and contraction in accordance with the requirements of JC476-2001 “Concrete ExpansionAgent” and other test methods.
Main technical parameters
1. Measuring range: 156----305mm
2. Standard rod length : 158 ± 0.2mm
176 ± 0.2mm
300 ± 0.2mm
3. Measuring device: dial gauge
Range: 0-1 mm
Accuracy: (division value) 0.001 mm
4. Coaxiality between the upper and lower clamp holes and the bracket: 0.25mm
5. Weight: about 2kg
6. Overall Dimensions: (Length × Width × Height) 122 × 100 × 470mm
The cement mortar ratio meter is mainly composed of a column, a base, a clamping frame and a meter table.
The lower end of the column is inserted into the base and secured to the base with nuts, so it is not suitable for frequent disassembly. One end of the clamp is inserted into the rod and clamped to the column with the set screw. The locking screw should after theAdjusting the clamping frame must be pressed against the column to prevent rotation or slipping.
The other end of the clamping frame is for inserting the gauge, which is clamped and fixed or loosened by the locking screw to move the gauge up and down.
The lower support nut is screwed onto the base to insert the specimen. In general, it is not suitable for disassembly. Attach the M2.5 thread at one end to the meter. Pay attention to the coaxiality.
Use and maintenance:
As a cement drying shrinkage test or to measure the expansion rate and residual stress value, it is necessary to use spherical plugs at both ends The standard test piece and the appropriate curing method for the molded part.
It should be placed stably on a rubber pad in a vibration-free environment and the room temperature in the laboratory should bebe controlled to 17-25°C. Before placing the test piece for each test;
Wipe the surface of the plug at both ends of the test piece clean and at the same time clean the upper with a light damp cotton yarn and lower bearing surfaces of the instrument (relative to the lower bearing surface). hole and contact hole) to prevent sand from falling in and affecting the measurement accuracy.
Then calibrate the zero point of the dial indicator (you can tap the glass surface with your finger to fix the needle position).
When reading, the test piece can be moved slightly so that the top of the test piece is in correct contact with the upper and lower seating surfaces of the instrument and the reading should be 0.01mm or 0.001mm. When the pointer oscillates, the average value can be found within the oscillating range.
The calculation formula of the measurement resultSee JC/T603-2004, JC313-82, JC453-92 and other relevant standards and test methods.
