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Automatic testing apparatus for slit appear time

An automatic test device and time-of-appearance technology, applied in material inspection products, special data processing applications, instruments, etc., can solve the problems of unlimited number of test points, inability to continuously observe, poor accuracy, etc., and achieve low cost, simple structure, Accurate effect

Inactive Publication Date: 2009-03-18
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention solves the problems of continuous observation and poor accuracy caused by manual observation of crack occurrence time, and provides an automatic crack detection device with unlimited test points, multi-point synchronous testing, and high test accuracy.

Method used

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  • Automatic testing apparatus for slit appear time
  • Automatic testing apparatus for slit appear time
  • Automatic testing apparatus for slit appear time

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Such as Figure 6 As shown, the present invention is applied to the field of civil engineering to test the appearance time of cracks of a concrete simply supported beam member under load. By drawing graphite lines at different measuring points, the simply supported beam is divided into different measuring point intervals to realize automatic and multi-point crack occurrence time detection.

Embodiment 2

[0032] Such as Figure 7 As shown, the present invention is applied to the ring method test of the early anti-cracking performance of cement-based cementitious materials such as hardened cement slurry, mortar, concrete, etc., in the field of civil engineering. Through the present invention, manual reading of data is avoided. The graphite wire is continuously distributed on the outer edge of the ring test piece, and the two ends of the graphite wire are staggered to ensure that the cracks can intersect the graphite wire. Connect the graphite wire (end points) on the ring test piece with the terminal of the timing / gating device through a wire. The timing / gating device realizes the sequential gating of the ring test piece, and the resistance value data of each ring test piece is digitized The multimeter reads in sequence and transmits it to the computer via the data line. By analyzing the data in the computer, the cracking time of each ring specimen is found. It is simple and convenie...

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Abstract

An automatic test method includes drawing graphite line on concrete tested piece in order to utilize property of graphite resistance rate being much lower than resistance of nonconductor test piece to make tested area a resistance element with lowered resistance, using wire to connect graphite line, timing / gating device, digital universal meter and computer in sequence to form an automatic tester for automatically testing out occurence time of crack on concrete or on someother nonconductor materials.

Description

Technical field: [0001] The invention relates to a device for automatically testing the occurrence time of cracks in non-conductor brittle materials. Background technique: [0002] In the field of civil engineering, the flat plate method and the ring method are used to test the crack resistance of cement-based cementitious materials, or in the stress performance test of reinforced concrete structures, a very important content is to read the time when the cracks appear. However, there is no method and device for automatically reading the cracking time of concrete at multiple points. At present, manual observation is often used to observe the occurrence time of multiple cracks, which cannot be continuously observed day and night, and the accuracy is poor. In the crack resistance test of cement-based materials or in the stress performance test of reinforced concrete structures, it is necessary to automatically test the concrete cracking time at multiple points at the same time. Sum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/04G01N33/38G06F17/00
Inventor 郑建岚罗素蓉王国杰王雪芳
Owner FUZHOU UNIV