A method for measuring the micro-expansion stress of cement-based materials
A technology of cement-based materials and measurement methods, applied in force/torque/work measuring instruments, measuring devices, special data processing applications, etc. The effect of ensuring measurement accuracy and high measurement accuracy
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Embodiment 1
[0040] as Figure 1 As shown, the present invention discloses a method of measuring the micro-expansion stress of a cementitious material, comprising the following steps:
[0041] Step 1: Make a test device, including: test sample 1, metal rod core 2, fixing mechanism and measurement system;
[0042] The test sample 1 is a hollow tube prepared from the cementitious material under test; the metal rod core 2 is sequentially coaxially connected to the first end segment 2-1, the first transition section 2-2, the middle segment 2-3, the second transition segment 2-4 and the second end segment 2-5, and the first end segment 2-1 and the second terminal segment 2-5 are greater than the cross-sectional area of the intermediate segment 2-3; the intermediate segment of the metal rod core 2-3 is located in the hollow introchannel of the test sample 1, And the axis of the metal rod core 2 is parallel to the axis of the test sample 1, the first end segment 2-1 and the second end segment 2-5 are ...
Embodiment approach
[0057] The measuring system is provided with two strain gauges 3, the two strain gauges 3 are disposed back to the surface of the intermediate segment 2-3;
[0058] In the third step, the data processing module is calculated according to the expansion stress according to the two strain gauges 3 measured in response to the equation one, and then the average of the two expansion stresses calculated is taken as the expansion stress of the cementitious material under test.
[0059] Thus, it can prevent the existence of small bends in the middle section 2-3 of the metal core 2 and affect the response variable measured by the strain gauge 3, further improving the measurement accuracy of the expansion stress of the cementitious material.
[0060] The above is the basic embodiment of the present embodiment II, may be further optimized, improved and limited on the basis of the basic embodiment:
[0061] Preferably: the cross-section of the test sample 1 is a toroidal surface; the cross-sec...
Embodiment 3
[0064] On the basis of the above example one or example two, the present embodiment THREE further adopts the following preferred embodiments:
[0065]The test solution is a sulfate solution, such as sodium sulfate solution, magnesium sulfate solution, potassium sulfate solution, etc.; the tube wall thickness of the test sample 1 is between 2.5mm and 5mm.
[0066] Thus, when measuring the expansion stress of the cementitious material by being attacked by sulfates, by using a test sample between 2.5mm and 5mm thickness of the tube wall 1, the influence of gradient stress can be effectively reduced to further improve the measurement accuracy of the expansion stress.
[0067] The above is the basic embodiment of the third embodiment of the present embodiment, which may be further optimized, improved and limited on the basis of the basic embodiment:
[0068] Preferred: The test sample 1 is a hollow circular tube with an outer diameter of 30mm, an inner diameter of 25mm, and a height of...
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Abstract
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