Concrete shrinkage expansion meter

HSP-540 typeConcrete shrinkage expansion meterThe concrete shrinkage and expansion meter complies with the provisions of GBJ82-85 and is an instrument used to measure the length (volume) changes of concrete specimens during the hardening process under certain environmental conditions. It can provide reliable basis for research, education, quality control, and testing of the characteristics of concrete by building science research institutes, design and construction units.

Technical Specifications:

Measurement range: 534-545mm

Standard rod length: 540 ± 0.2mm

Range of dial gauge: 0-10mm

Dimensions (length x width x height): 670 x 240 x 180mm

Operating procedures:

1. Before measuring the deformation of the specimen, the measuring frame must be calibrated on the standard rod to align the dial indicator with zero position (or record the scale value on the dial).

2. Wipe both ends of the prepared test piece clean, then place it on the workbench. Place the calibrated measuring frame on the test piece and move the measuring frame left and right to ensure that the top of the test piece is in accurate contact with the measuring head of the measuring frame. At this point, the reading can be made on the dial gauge and the scale value on the dial can be recorded.

3. If the experiment is not conducted continuously or after a long period of time, the measurement framework must be calibrated on a standard rod before testing.

Concrete shrinkage expansion meterInstructions for Use:

1. Select the desired center height of the standard rod, place the left end of the standard rod against the groove of the positioning column, and ensure that the lower plane of the standard rod bracket is tightly attached to the reference surface of the base. Then slowly push the other end of the standard rod into the center of the instrument.

2. Loosen the set screw and slowly insert the dial gauge into the adjustable column hole of your choice, so that the dial gauge probe contacts the right end of the standard rod. Then tighten the set screw to position the dial gauge on the instrument. Read and remember the scale of the dial indicator at this moment.

3. The installation method of concrete specimens is the same as 1.

4. The production, curing, shrinkage, and expansion tests of concrete specimens shall be conducted in accordance with relevant standards such as GBJ82-85.

Precautions

1. The instrument should be placed on a flat workbench, and its four feet should be evenly stressed. Avoid three-point force to prevent deformation of the instrument and affect accuracy.

2. The standard rod is the reference length unit of the instrument and must be handled with care to prevent deformation.

3. The dial gauge is a precision component, and the specimen should be placed and removed gently and carefully, without colliding with the gauge frame and stem.

4. After each use, a small amount of lubricating oil should be applied to the surface of non painted parts, and instrument oil should be applied to the surface of the moving parts of the dial gauge.

5. Dust prevention measures should be taken in environments with high dust concentration or long-term shutdown.