Induced cracking process for crack resistant performance test of cement base material and apparatus thereof
A cement-based material, anti-crack performance technology, applied in the direction of measuring devices, analysis materials, material inspection products, etc., can solve the problems of long test time, inaccurate test results, large randomness, etc., to achieve simple use and shorten observation The effect of high time and precision
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Embodiment 1
[0023] like figure 1 Shown: According to the size of the rectangular frame body 1 and the shrinkage of the cement-based material, in the rectangular frame body 1 constrained in one direction, set 1 to 10 pairs along the free side perpendicular to the rectangular frame body 1 with a length of 1 / 10~ 2 / 5 Frame body 1 constrains the partition board 3 with side length, and evenly divides the frame side of frame body 1, thereby reducing the cross-sectional area of the corresponding section. When the cement-based material shrinks, the stress generated at this section is greater than that of other sections. section, thereby accelerating the generation of cracks and guiding cracks to be generated in this section. The position and the number of cracks that may appear are relatively determined, and the cracks appear early, develop quickly, and have a large width, which is easy to observe, with short observation time and high accuracy.
Embodiment 2
[0025] As shown in Figure 2, according to the size of the frame body 1 and the size of the shrinkage of the cement-based material, 1 to 10 pairs of partitions 3 are arranged in the rectangular frame body 1 with two-way constraints along the long frame side perpendicular to the rectangular frame body 1, The length of the separator 3 is 1 / 10 to 2 / 5 of the length of the short side of the rectangular frame 1, and the long side of the frame 1 is evenly divided into equal parts, thereby reducing the cross-sectional area of the corresponding section. When the cement-based material shrinks, the The stress generated at this section is greater than that at other sections, thereby accelerating the generation of cracks and guiding cracks to be generated at this section.
Embodiment 3
[0027] As shown in Figure 3: in the two-way constrained rectangular frame 1, a partition 3 is arranged in the middle of the four frame sides 1 along the frame side perpendicular to the frame 1, and the length of the partition 3 is parallel to the frame 1 / 10 to 2 / 5 of the frame side length of 1, thereby reducing the cross-sectional area of the corresponding section.
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