Welcome to Qinsun Instruments Co., Limited.
- +86-21-6780 0179 |
- info@qinsun-lab.com |
- Customer Services
The cement mortar ratio meter is suitable for use in accordance with JC/T603-2004 “Cement Mortar Drying Shrinkage Test Method”, JTGE30-2005 “Highway Engineering Cement and Concrete Test Regulations”, T0511 regulations and JGJ70-90 The dry shrinkage of cement mortar and cement mortar samples at each age is measured in accordance with the requirements of “Test Method for Basic Performance of Building Mortar”, GB11972-89 “Test Method for Dry Shrinkage of Air-entrained Concrete” and GB/. T14685 Rate Pebbles and gravel for construction;
The expansion rate of this type of cement can also be measured according to the requirements of JC313-96 Test method for expansion rate of expansive cement and JC453-96 Method for Physical Inspection of Self-Stressed Cement Materials. Limit the expansion rate and residual stress value.
It is suitable for high-precision measurement of expansion and contraction ratio in accordance with JC476-2001 “Concrete Expansion Agent” and other testing methods.
Main technical parameters
1. Measuring range: 156----305mm
2. Standard rod length : 158 ± 0.2 mm
176 ± 0.2 mm
300 ± 0.2 mm
3. Measuring device: dial indicator
Range: 0-1 mm
Accuracy: (gradation value) 0.001 mm
< br/ > 4. Coaxiality between the upper and lower clamping holes and the bracket: <0.25 mm
5. Weight: approx. 2 kg
6. Overall dimensions (length × width × height) 122 × 100 × 470 mm
The cement mortar aspect ratio measuring device is mainly composed of a column, a base, a clamping frame and a measuring device.
The lower end of the column is inserted into the base and screwed to the base with nuts. It should not be disassembled frequently. One end of the clamp is inserted into the rod and clamped to the column with the locking screw. The locking screw should dTighten the column after adjusting the clamp frame in place to prevent rotation or slipping.
The other end of the clamping frame is used to insert the gauge and clamp it with the locking screw or loosen it to move the gauge up and down.
The lower support is bolted to the base with nuts to insert the test piece. It is generally not suitable for disassembly. One end of the top foot is a pit that must be inserted into the top of the test specimen during testing. The other end is a depression. Attach the M2.5 thread to the meter at one end, paying attention to coaxiality.
Use and Maintenance:
When testing cement drying shrinkage or measuring expansion rate and residual stress value, it is necessary to use spherical tops at both ends . Standard test pieces andappropriate molding and maintenance methods.
It should be placed stably on a rubber base in a vibration-free environment. The room temperature in the test room should preferably be controlled at 17-25°C.Before placing the test piece for each test;
The top surfaces at both ends of the test piece and at the same time the top and bottom support surfaces of the instrument should be wiped clean (relative to the lower support surface) should be wiped with slightly damp cotton gauze. Holes and contact holes) to prevent sand from falling in and affecting measurement accuracy.
Then calibrate the zero point of the dial indicator (you can tap the glass surface with your finger to set the needle position).
When reading, the test piece can be moved slightly so that the top of the test piece is in proper contact with the upper and lower support surfaces of the instrument. TheMeasurement should be 0.01 mm or 0.001 mm. When the pointer oscillates, the average value within the oscillation range can be determined.
Detailed calculation formulas for measurement results can be found in JC/T603-2004, JC313-82, JC453-92 and other relevant standards and test methods.
