Integrated device for continuously monitoring shrinkage of neat cement paste, mortar and concrete

Abstract

The utility model discloses an integrated device for continuously monitoring shrinkage of neat cement paste, mortar and concrete, a to-be-tested piece is arranged in a shrinkage test mold, the to-be-tested piece consists of a corrugated pipe for containing slurry and a metal tested body, and mounting holes are formed in two ends of the shrinkage test mold; one end of a metal measured body is connected with one of the mounting holes, the other end of the metal measured body abuts against an eddy current displacement sensor mounted on the other mounting hole, and a color paperless recorder, a full-isolation multi-protection type converter and data acquisition equipment are arranged on the outer side of the contraction test mold. The shrinkage test mold comprises a first test mold for cement paste and mortar shrinkage test and a second test mold for concrete shrinkage test. The device can test the shrinkage rates of cement paste, mortar and concrete at the same time, overcomes the defects of single function and limited application scene of a conventional shrinkage meter, can measure a plurality of to-be-tested pieces at a time, and is beneficial to improving the accuracy of a detection result.

Description

Technical Field

[0001] The utility model relates to the technical field, and more specifically, to an integrated device for continuously monitoring the shrinkage of neat cement, mortar and concrete. Background Art

[0002] For nearly two centuries, concrete mainly composed of cement has developed into one of the most widely used engineering materials due to its strong designability and excellent mechanical properties. To meet diverse construction needs, there is an endless variety of concrete products, but their composition materials are relatively similar, usually consisting of cement, water, sand, stone and admixtures, etc. Under the action of mixing and curing, the originally dispersed cement and other components are fully mixed and produce a significant synergistic effect, generating a homogeneous and high-strength multi-phase composite matrix and showing good stability.

[0003] Shrinkage cracking is a common phenomenon in cement-based and concrete structures. However, most of the existing geotechnical material shrinkage meters have a single function and can only measure the shrinkage deformation of a certain specific material alone, such as concrete, mortar, etc.; at the same time, in the prior art, the above parameters are mainly measured by the dial gauge method and the strain gauge method, but the above methods are significantly affected by human factors and the external environment, resulting in large errors in the test data of the specimens and seriously affecting the accuracy of the test results. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model lies in that the existing shrinkage meter has a single function and the measurement result is not accurate enough. In order to overcome the defects of the prior art, the utility model provides an integrated device for continuously monitoring the shrinkage of neat cement, mortar and concrete. The first test mold is suitable for the shrinkage test of neat cement and mortar, and the second test mold is suitable for the shrinkage test of concrete, overcoming the disadvantages of the previous shrinkage meter with a single function and limited application scenarios. Moreover, this device can measure multiple specimens to be tested at one time, which helps to improve the accuracy of the detection results.

[0005] To achieve this purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides an integrated device for continuously monitoring the shrinkage of cement paste, mortar and concrete, which comprises shrinkage test molds, specimens to be tested, eddy current displacement sensors, color paperless recorders, fully isolated multi-protection converters and data acquisition devices. Two or more shrinkage test molds are arranged side by side. Specimens to be tested are arranged in the shrinkage test molds. Each specimen to be tested consists of a corrugated pipe for containing slurry and a metal object to be measured, and both ends of the metal object to be measured extend out of the corrugated pipe. Installation holes are arranged at both ends of the shrinkage test molds. One end of the metal object to be measured is connected to one of the installation holes, and the other end of the metal object to be measured abuts against the eddy current displacement sensor installed on the other installation hole. A color paperless recorder, a fully isolated multi-protection converter and a data acquisition device are arranged outside the shrinkage test molds, and the eddy current displacement sensors, the color paperless recorders, the fully isolated multi-protection converters and the data acquisition devices are electrically connected. The shrinkage test molds include a first test mold for testing the shrinkage of cement paste and mortar and a second test mold for testing the shrinkage of concrete.

[0007] In a preferred technical solution of the utility model, the shrinkage test molds are made of acrylic materials.

[0008] In a preferred technical solution of the utility model, the eddy current displacement sensor includes a probe, a preamplifier and a high-frequency cable. The probe abuts against the end of the metal object to be measured, the probe is electrically connected to the preamplifier, and the preamplifier is electrically connected to the color paperless recorder through the high-frequency cable.

[0009] In a preferred technical solution of the utility model, the metal object to be measured is detachably connected to the installation hole through a threaded mounting sleeve.

[0010] In a preferred technical solution of the utility model, the data acquisition device includes a host computer and a liquid crystal display. The fully isolated multi-protection converter is electrically connected to the host computer, and the host computer is electrically connected to the liquid crystal display.

[0011] The beneficial effects of the utility model are as follows:

[0012] An integrated device for continuously monitoring the shrinkage of cement paste, mortar and concrete proposed by the present utility model. The first test mold is applicable to the shrinkage test of cement paste and mortar, and the second test mold is applicable to the shrinkage test of concrete. It overcomes the disadvantages of the previous shrinkage gauge with a single function and limited application scenarios. Moreover, this device can measure multiple test specimens at one time, which helps to improve the accuracy of the test results. One end of the metal object to be measured is connected to the test specimen, and the other end is in contact with the probe of the eddy current displacement sensor, which can accurately and real-time reflect the deformation of the test specimen. By pouring cement paste, mortar and concrete into the corrugated pipe, the corrugated pipe is soft in texture, which can reduce the obstruction to the shrinkage deformation of cement paste, mortar and concrete, making the shrinkage values of cement mortar, paste and concrete closer to the true values. By using a colorless paperless recorder to record the data measured by the eddy current displacement sensor, the continuous detection of the shrinkage of cement paste, mortar and concrete can be realized. By connecting each component with a high-frequency cable, the interference such as static electricity can be effectively avoided, making the measured shrinkage value more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 FIG. is a schematic structural diagram of an integrated device for continuously monitoring the shrinkage of cement paste, mortar and concrete provided by the specific embodiment of the present utility model;

[0014] Figure 2 is Figure 1 the top view of;

[0015] Figure 3 is Figure 2 the partial enlarged view of part A in;

[0016] In the figure:

[0017] 1. Shrinkage test mold; 11. Mounting hole; 12. First test mold; 13. Second test mold; 2. Test specimen; 21. Corrugated pipe; 22. Metal object to be measured; 3. Eddy current displacement sensor; 31. Probe; 32. Pre-amplifier; 33. High-frequency cable; 4. Colorless paperless recorder; 5. Fully isolated multi-protection type converter; 6. Data acquisition device; 61. Host; 62. Liquid crystal display; 7. Mounting sleeve thread. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The technical solution of the present utility model will be further described below in conjunction with the drawings and through specific embodiments.

[0019] As Figures 1-3As shown in the figure, in an embodiment, an integrated device for continuously monitoring the shrinkage of neat cement, mortar and concrete is provided, including a test mold 1 for shrinkage, a test specimen 2 to be tested, an eddy current displacement sensor 3, a colorless paperless recorder 4, a fully isolated multi-protection type converter 5 and a data acquisition device 6. Two or more test molds 1 for shrinkage are arranged side by side. A test specimen 2 to be tested is arranged in the test mold 1 for shrinkage. The test specimen 2 to be tested is composed of a corrugated pipe 21 for containing slurry and a metal object to be measured 22. Both ends of the metal object to be measured 22 extend out of the corrugated pipe 21. Installation holes 11 are arranged at both ends of the test mold 1 for shrinkage. One end of the metal object to be measured 22 is connected to one of the installation holes 11, and the other end of the metal object to be measured 22 abuts against the eddy current displacement sensor 3 installed on the other installation hole 11. A colorless paperless recorder 4, a fully isolated multi-protection type converter 5 and a data acquisition device 6 are arranged outside the test mold 1 for shrinkage. The eddy current displacement sensor 3, the colorless paperless recorder 4, the fully isolated multi-protection type converter 5 and the data acquisition device 6 are electrically connected. The test mold 1 for shrinkage includes a first test mold 12 for testing the shrinkage of neat cement and mortar and a second test mold 13 for testing the shrinkage of concrete. In this embodiment, the test mold 1 for shrinkage is used to accommodate the test specimen 2 to be tested, and two or more test molds 1 for shrinkage are provided, which can detect multiple test specimens 2 to be tested at the same time, helping to ensure the accuracy of the test results. When in use, neat cement, mortar or concrete is poured into the corrugated pipe 21 to obtain the test specimen 2 to be tested. Since the corrugated pipe 21 is soft and thin, it can accurately restore the shrinkage deformation degree of neat cement, mortar and concrete, thereby improving the accuracy of the shrinkage test results. One end of the metal object to be measured 22 is anchored on the test mold 1 for shrinkage, which can effectively reduce the measurement error of the shrinkage of the concrete formed specimen and improve the detection accuracy. The eddy current displacement sensor 3 can detect the shrinkage amount of the metal object to be measured 22 in real time, and then obtain the shrinkage amount of the test specimen 2 to be tested, and send the test result to the colorless paperless recorder 4 for recording. The colorless paperless recorder 4 can record the test results of multiple test specimens 2 to be tested at the same time, improve work efficiency and reduce the manual operation time. The fully isolated multi-protection type converter 5 has the advantages of anti-static, anti-interference, fast communication response and small delay, thus realizing real-time and continuous shrinkage testing. The data acquisition device 6 is used to collect and process the detection data and output the detection results. Both the first test mold 12 and the second test mold 13 are rectangular shells, and the first test mold 12 and the second test mold 13 are arranged separately for convenient management.

[0020] Specifically, the test mold 1 for shrinkage is made of acrylic material. In this embodiment, the use of acrylic material makes the inner surface of the test mold 1 for shrinkage smooth, thereby reducing the friction between the test specimen 2 to be tested and the inner wall of the test mold 1 for shrinkage when the test specimen 2 deforms, making the shrinkage test results more accurate.

[0021] Specifically, the eddy current displacement sensor 3 includes a probe 31, a preamplifier 32, and a high-frequency cable 33. The probe 31 abuts against the end of the metal object to be measured 22. The probe 31 is electrically connected to the preamplifier 32, and the preamplifier 32 is electrically connected to the colorless paperless recorder 4 through the high-frequency cable 33. In this embodiment, the head body of the probe 31 is made of high-temperature resistant PPS engineering plastic, and the coil is sealed therein by "secondary injection molding". The preamplifier 32 is the signal processing center of the entire sensor system, providing high-frequency alternating excitation current for the coil of the probe 31 to enable the normal operation of the probe 31. A total of 8 eddy current displacement sensors 3 are provided, and the number of eddy current displacement sensors 3 matches the number of shrinkage test molds 1.

[0022] Specifically, the metal object to be measured 22 is detachably connected to the mounting hole 11 through the mounting sleeve thread 7. In this embodiment, the metal object to be measured 22 is fixed by the mounting sleeve thread 7 to reduce the measurement error caused by the small displacement of the metal object to be measured 22. The mounting sleeve thread 7 is thread-matched with the metal object to be measured 22 and has the same cross-section, enabling the probe 31 of the eddy current displacement sensor 3 to stably contact the metal object to be measured 22.

[0023] Specifically, the data acquisition device 6 includes a main unit 61 and a liquid crystal display 62. The fully isolated multiple protection type converter 5 is electrically connected to the main unit 61, and the main unit 61 is electrically connected to the liquid crystal display 62. In this embodiment, the main unit 61 can receive the data from the colorless paperless recorder 4, process it, and then output the result to the liquid crystal display 62 for display, thereby realizing the effective conversion of shrinkage test data and the visual operation of the shrinkage test process.

[0024] Working principle: When the instrument is in use, cement paste and mortar are poured into the corrugated pipe 21, and then placed in the first test mold 12, and one end of the specimen is hinged and fixed on the first test mold 12; concrete is poured into the corrugated pipe 21, and then placed in the second test mold 13, and one end of the specimen is hinged and fixed on the second test mold 13. When the specimen made of cement paste, mortar or concrete shrinks, it will drive the metal object to be measured 22 to shrink synchronously. The deformation value of the metal object to be measured 22 can be detected by the eddy current displacement sensor 3, and then the shrinkage amount of the test object 2 can be obtained. Then, the detection result is transmitted to the colorless paperless recorder 4 for recording, and the main unit 61 processes the data and transmits it to the liquid crystal display 62 for display, thereby realizing the effective conversion of shrinkage test data and the visual operation of the shrinkage test process.

[0025] The present utility model is described by way of preferred embodiments. Those skilled in the art will appreciate that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the present utility model. The present utility model is not limited by the specific embodiments disclosed herein, and other embodiments falling within the scope of the claims of this application all belong to the scope of protection of the present utility model.

Claims

1. An integrated device for continuously monitoring the shrinkage of neat cement paste, mortar and concrete, characterized in that: It includes a shrinkage test mold (1), a specimen to be tested (2), an eddy current displacement sensor (3), a colorless paperless recorder (4), a fully isolated multi-protection type converter (5) and a data acquisition device (6). There are two or more shrinkage test molds (1) arranged side by side. A specimen to be tested (2) is arranged in the shrinkage test mold (1). The specimen to be tested (2) is composed of a corrugated pipe (21) for containing slurry and a metal object to be measured (22). Both ends of the metal object to be measured (22) extend out of the corrugated pipe (21). Mounting holes (11) are provided at both ends of the shrinkage test mold (1). One end of the metal object to be measured (22) is connected to one of the mounting holes (11), and the other end of the metal object to be measured (22) abuts against the eddy current displacement sensor (3) mounted on the other mounting hole (11). A colorless paperless recorder (4), a fully isolated multi-protection type converter (5) and a data acquisition device (6) are arranged outside the shrinkage test mold (1). And the eddy current displacement sensor (3), the colorless paperless recorder (4), the fully isolated multi-protection type converter (5) and the data acquisition device (6) are electrically connected. The shrinkage test mold (1) includes a first test mold (12) for testing the shrinkage of neat cement paste and mortar and a second test mold (13) for testing the shrinkage of concrete.

2. The integrated device for continuously monitoring the shrinkage of neat cement paste, mortar and concrete according to claim 1, characterized in that: Both the first test mold (12) and the second test mold (13) are made of acrylic materials.

3. The integrated device for continuously monitoring the shrinkage of neat cement paste, mortar and concrete according to claim 1, characterized in that: The eddy current displacement sensor (3) includes a probe (31), a preamplifier (32) and a high-frequency cable (33). The probe (31) abuts against the end of the metal object to be measured (22). The probe (31) is electrically connected to the preamplifier (32), and the preamplifier (32) is electrically connected to the colorless paperless recorder (4) through the high-frequency cable (33).

4. An integrated device for continuously monitoring the shrinkage of neat cement paste, mortar and concrete according to claim 1, characterized in that: The metal object to be measured (22) is detachably connected to the mounting hole (11) through a mounting sleeve thread (7).

5. An integrated device for continuously monitoring the shrinkage of neat cement paste, mortar and concrete according to claim 1, characterized in that: The data acquisition device (6) includes a mainframe (61) and a liquid crystal display (62). The fully isolated multi-protection type converter (5) is electrically connected to the mainframe (61), and the mainframe (61) is electrically connected to the liquid crystal display (62).

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