Restrained expansion rate measuring instrument of cement expanding agent and concrete mold device
A technology of concrete and expansion agent, which is used in measuring devices, instruments, scientific instruments, etc., can solve the problems of inability to guarantee the same test conditions of the specimen, low measurement data accuracy, measurement data errors, etc., so as to eliminate the existence of artificial alignment and measurement. error, improve measurement accuracy, and reduce labor intensity
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Embodiment 1
[0058] Under laboratory standard test conditions, the expansion agent limits the expansion rate measurement. Table 1 is the mixing ratio of the mortar mixed with expansion agent for testing. Among them, the cement is the benchmark cement specified in GB 8076; the expansion agent is HCSA high-performance expansion agent; the standard sand is the standard sand meeting the requirements of GB / T 17671; the water is tap water.
[0059] Table 1
[0060]
[0061] When the compressive strength of the mortar test piece reaches 10MPa, demould, at the same time, use a copper wire brush to clean the probes at both ends of the limiter, and then move the measuring instrument into a constant temperature room at a temperature of (20±1)°C, and place the three mortar test pieces The parts are respectively placed in the three positioning grooves of the positioning block. At this time, the measuring head at one end of the limiter makes "point-surface contact" with the surface of the second end...
Embodiment 2
[0082] According to the raw materials and methods given in Example 1, under the laboratory standard testing conditions, the expansion agent limited expansion ratio measurement was carried out. Adjust the elastic force of the fixing piece to 20N by turning the adjusting screw, and fix the three mortar specimens. The measured expansion agent limited expansion rate test results are shown in Figure 7 ; Then adjust the elastic force of the fixture to 80N by turning the adjusting screw, and then fix the three mortar specimens. Figure 8 .
[0083] Depend on Figure 7 , Figure 8 It can be seen that with Figure 6 In comparison, when the elastic force value of the fixture is 20N, the values of the limiting expansion ratios of the three specimens are more discrete, and the reliability of the data is poor. When the elastic force value of the fixing piece is 80N, the limiting expansion ratio values of the three test pieces are obviously lower than the data measured when the ela...
Embodiment 3
[0085] Under site conditions, the expansion agent limits the expansion rate measurement. Table 2 is the mixing ratio of the mortar mixed with expansion agent for testing. Among them, the cement is the benchmark cement specified in GB 8076; the expansion agent is the CSA expansion agent taken from the construction site; the standard sand is the standard sand that meets the requirements of GB / T 17671; the water is tap water.
[0086] Table 2
[0087]
[0088] According to the method given in Example 1, place the measuring instrument together with the test piece in an air-conditioned room, and control the room temperature at (20±2)°C. Use manual readings to record the length changes of the three mortar specimens in water for 7 days. See Figure 9 . From Figure 9 It can be seen that under the non-standard laboratory conditions on the construction site, the measured limiting expansion ratio values of the three mortar specimens are also very close.
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