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Preparation of mortar penetrameter specimen and matters needing attention

Release time: July 14, 2019 popularity: twelve

The method of making penetration test piece is as follows

1. The specimens were cured by forming. According to the material ratio required by the design, the forming die (also known as the secondary die) is used to make the shape, and then the curing is carried out according to the specification of the ministry standard or international standard.

2. Dry the surface of the cured specimen, and then apply the melted sealing material (fire paint or sealing wax) on its side. Pay attention to both ends of the specimen, and do not apply sealing materials.

3. Heat the test mold to 400 ℃, then put the specimen coated with sealing material into the mold cavity, then press the test piece into the test mold on the press (screw press or pressure testing machine borrowed from the laboratory) and cool it to room temperature.

4. Install the test mold of the pressed specimen on the working table of the impermeability instrument, and tighten the hexagon bolts evenly.

Precautions for mortar permeameter:

1. Open the control valve, i.e. send water pressure to the corresponding test body. Pay attention to observe whether there is leakage at the bottom of the test mold. If there is leakage, it is necessary to tighten the compression nut at the corresponding part.

2. After entering the normal test, the operation test shall be carried out according to relevant standards. For example, jc474-92: the water pressure increases to 0.3MPa when the water pressure is kept at 0.2MPa for 2 hours, and the working pressure is increased by 0.1MPa every 1 hour. Observe whether there is water seepage at the end face of the test piece. If there is water seepage, close the corresponding control valve.

3. When pressure water seeps from the end faces of all three specimens in a group, the test can be stopped and the maximum water pressure of each specimen is recorded as the calculation basis.

4. At the end of the test, cut off the power supply, open the water discharge and pressure relief valve, reduce the system pressure to zero, and remove the test mold.

5. Press out the test piece from the test mold, clean the test mold, mold base, and coat with antirust oil for reuse.  

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