Concrete shrinkage test device and operation method

Abstract

The invention relates to a concrete shrinkage test device and an operation method. The concrete shrinkage test device comprises a test piece, a shrinkage test piece high turnover rate preparation mold and a shrinkage test vibration reduction test device, the high-turnover-rate preparation mold for the shrinkage test piece is used for pouring of the test piece, and the shrinkage test vibration reduction test device is used for a shrinkage test of the test piece. The high-turnover-rate test piece preparation mold has the beneficial effects that concrete test pieces can be rapidly prepared by adopting the high-turnover-rate test piece preparation mold, the production efficiency is improved, the waiting time in the test piece preparation process is shortened, and the mold is reasonable in structure; the device is provided with a foam damping structure, so that the interference of external vibration on a test result can be effectively reduced, and the test precision and stability are improved; meanwhile, the steel frame structure is stable and durable, it is ensured that test data are more accurate and reliable, test errors caused by vibration are reduced, and the repeatability of the test and the scientificity of the result can be improved.

Description

Technical Field

[0001] The invention belongs to the field of civil engineering, and in particular relates to a concrete shrinkage test device and an operating method. Background Art

[0002] Concrete is a common building material that undergoes volume changes, especially shrinkage, during the hardening process. If this volume shrinkage is not effectively controlled, it may cause cracks inside the concrete, affecting the durability, safety and service life of the structure. Therefore, systematic research on the shrinkage behavior of concrete and accurate measurement of its shrinkage have important theoretical significance and engineering value.

[0003] At present, there are certain limitations in the testing technology and equipment for concrete shrinkage. For example, traditional methods often fail to meet high requirements in terms of measurement accuracy, environmental control, and data continuity. In addition, since the shrinkage of concrete is significantly affected by environmental factors such as temperature and humidity, the existing test equipment is insufficient in simulating actual construction conditions and maintaining environmental stability, which brings challenges to research work.

[0004] In order to solve the above problems, it is particularly important to develop a high-precision, environmentally controllable and easy-to-operate concrete shrinkage test device. This can not only improve the reliability of test data, but also provide support for in-depth research on the shrinkage mechanism of concrete. At the same time, optimizing the operating method makes the test process more efficient, which helps promote the practical application research of concrete materials under complex engineering conditions. Summary of the invention

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a concrete shrinkage test device and an operating method.

[0006] The concrete shrinkage test device comprises: a test piece, a shrinkage test piece high turnover rate preparation mold and a shrinkage test vibration reduction test device;

[0007] The shrinkage test piece high turnover rate preparation mold is used for casting the test piece, and comprises: a semicircular unit mold, a base and a template base, two semicircular unit molds are spliced ​​into an integral mold, the semicircular unit mold is placed on the template base, and the semicircular unit mold is arranged on both sides of the base of the template base;

[0008] The shrinkage test vibration reduction test device is used for the shrinkage test of the specimen, and includes a shock-absorbing base. The top of the shock-absorbing base is provided with a stable base plate, a vertical pole, an electronic digital display, a support rod and a data acquisition system. The vertical poles are symmetrically arranged on both sides of the stable base plate. The top of the support rod is provided with a fixed hoop, and a hanging plate is provided on the side of the fixed hoop. The electronic digital display is arranged on the hanging plate, and the bottom end contacts the top surface of the specimen.

[0009] The operating method of the concrete shrinkage test device comprises the following steps:

[0010] Step 1: Splice the two semicircular unit molds on both sides of the base, put the fixed ring plate on the bottom of the vertical rod, then place the vertical rod in the slide groove, and insert the L-shaped plug rod into the socket;

[0011] Step 2: Place the bottom embedded screw in the resting hole, and then pour the specimen concrete. At the same time, set a top reserved hole on the top of the specimen; remove the mold after pouring the specimen;

[0012] Step 3: Connect the annular collar to the vertical pole, install the test piece in the annular collar, and install a tin-platinum sheet with a screw rod on the top of the test piece;

[0013] Step 4: Install the fixed hoop on the top of the support rod, adjust the height and install the electronic digital display, so that the contact rod at the bottom of the electronic digital display contacts the tin-platinum sheet on the top of the test piece;

[0014] Step 5: Adjust the initial scale of the electronic digital display to zero, and then use the electronic digital display to measure the data, calculate the shrinkage rate, and calculate the arithmetic mean.

[0015] Preferably, the high-turnover preparation mold for shrinkage specimens includes: a temporary template fixing part, a unit assembly mold and a template base; slide grooves are provided on both sides of the template base, and multiple rows of sockets are symmetrically provided on both sides of the slide grooves, and two temporary template fixing parts are installed on the slide grooves; a base is provided in the center of the top of the template base, and the unit assembly mold includes a vertical rod and a semicircular unit mold, the two vertical rods are installed on the temporary template fixing part, and the two semicircular unit molds are closed to form a cylindrical mold, the cylindrical mold is inserted on the base, and the cylindrical mold is installed between the two vertical rods through a cross bar.

[0016] Preferably, the shrinkage test vibration reduction test device comprises: a specimen fixing frame, a test instrument shelf, a shock-absorbing base and a data acquisition system; the specimen fixing frame, the test instrument shelf and the data acquisition system are all arranged on the shock-absorbing base; the test instrument shelf comprises a support rod, the top end of the support rod is provided with a hanging plate through the outside of the fixed sleeve; an electronic digital display is installed on the hanging plate; the specimen fixing frame comprises a vertical pole, the side of the vertical pole is provided with a plurality of horizontal plug rods, the ends of the horizontal plug rods are connected to annular rings, and the several annular rings are sleeved on the specimen; the data acquisition system is used to process the data tested by the electronic digital display, the bottom of the electronic digital display is provided with a table rod, the lower part of the table rod is provided with a contact rod, and the contact rod is in contact with the top surface of the specimen.

[0017] Preferably, the temporary fixing part of the template includes a fixed ring plate and an L-shaped plug rod, and the L-shaped plug rod is symmetrically provided on the outer side of the fixed ring plate; the bottom of the vertical rod is put on the fixed ring plate, the L-shaped plug rod of the fixed ring plate is placed in the socket, and the vertical rod is placed in the slide groove.

[0018] Preferably, a reserved socket is provided at the bottom of the semicircular unit mold, a base reserved hole is provided on the outside of the base, the base reserved hole and the reserved socket are connected by an insertion rod and fastened with a nut; a shelf hole is provided at the top of the base, a bottom embedded screw is embedded in the central bottom of the specimen, a top reserved hole is provided at the top of the specimen, and the bottom embedded screw is placed in the shelf hole.

[0019] Preferably, the test instrument shelf comprises: a hanging plate, a support rod, an adjusting bolt and a fixing hoop, the fixing hoop is sleeved on the top of the support rod and fixed with an adjusting bolt, and a hanging plate is provided on the outside of the fixing hoop; a reserved hole is provided on the top of the hanging plate, a screw hole is provided on the side of the hanging plate, the meter rod passes through the reserved hole, and then the adjusting nut is inserted into the screw hole for fixing; a hoop screw hole is provided on the outside of the fixing hoop, the support rod passes through the fixing hoop, and the adjusting bolt is inserted into the hoop screw hole.

[0020] Preferably, the specimen fixing frame is used for stabilizing the specimen, and comprises: a nut, a transverse rod, an annular collar, a vertical rod and a fixed base plate; the transverse rod, annular collar and vertical rod constitute the overall frame of the specimen fixing frame; the top of the fixed base plate is provided with a vertical rod, and the side of the vertical rod is provided with a plurality of rows of vertical rod reserved holes; one end of the transverse rod is inserted into the vertical rod reserved hole, and the other end is connected to the annular collar, and the annular collar is sleeved on the specimen; the fixed base plate is symmetrically arranged on the shock-absorbing bases on both sides of the stable base plate, and the transverse rod passes through the vertical rod reserved hole and the collar reserved hole in turn, and is fixed with a nut.

[0021] Preferably, a top reserved hole is provided on the top of the specimen, a bottom embedded screw is provided on the bottom of the specimen, the specimen is placed on a stable bottom plate after passing through an annular ring, and a tin-platinum sheet is provided on the top of the specimen; a screw plug hole is provided on the top of the stable bottom plate, and the stable bottom plate is arranged at the top center of the shock-absorbing base; the bottom embedded screw is placed in the screw plug hole, the screw rod is placed in the top reserved hole, a tin-platinum sheet is provided on the top of the screw rod, and the tin-platinum sheet is in contact with the bottom of the contact rod.

[0022] The beneficial effects of the present invention are:

[0023] 1) The present invention adopts a high-turnover specimen preparation mold to achieve rapid preparation of concrete specimens, improve production efficiency, and reduce waiting time during specimen preparation. The mold has a reasonable structure and a high reuse rate, which reduces material waste, reduces the cycle and cost of specimen preparation, improves test efficiency, and provides a guarantee for large-scale testing, thereby saving manpower and material resources.

[0024] 2) The device used in the present invention is equipped with a foam vibration reduction structure, which can effectively reduce the interference of external vibration on the test results and improve the accuracy and stability of the test; at the same time, the steel frame structure is stable and durable, ensuring that the test data is more accurate and reliable, reducing the test errors caused by vibration, and helping to improve the repeatability of the test and the scientific nature of the results.

[0025] 3) The overall test device involved in the present invention has a user-friendly design, a compact structure, simple operation, and easy maintenance, which reduces the workload of operators and greatly lowers the usage threshold, allowing non-professionals to quickly get started, thereby improving the convenience and efficiency of test work, reducing the maintenance and operating costs of the test device, and enhancing the promotion and practicality of the equipment.

[0026] 4) The whole set of devices and operating methods in the present invention are scientifically and reasonably designed, which can significantly improve the test efficiency, while taking into account the accuracy and repeatability of the data, reducing external interference and test errors, and obtaining accurate and reliable test data while ensuring the efficient conduct of the test, which provides strong support for the research on concrete shrinkage performance, thereby promoting the innovation and application of related technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic elevation diagram of a concrete shrinkage test device;

[0028] Figure 2 It is a three-dimensional schematic diagram of the concrete shrinkage test device;

[0029] Figure 3 It is a three-dimensional schematic diagram of the overall skeleton of the concrete shrinkage test device;

[0030] Figure 4 It is a three-dimensional schematic diagram of the base of the concrete shrinkage test device;

[0031] Figure 5 is a three-dimensional schematic diagram of the shrinkage specimen;

[0032] Figure 6 is a three-dimensional schematic diagram of the bottom of the shrinkage specimen;

[0033] Figure 7 It is a three-dimensional schematic diagram of a tin-platinum sheet;

[0034] Figure 8 It is a three-dimensional schematic diagram of an annular collar;

[0035] Fig. 9 It is a three-dimensional schematic diagram of the mold for preparing high turnover rate specimens for concrete shrinkage test;

[0036] Fig.10 It is a schematic elevation diagram of a mold for preparing high turnover rate specimens for concrete shrinkage test;

[0037] Fig.11 It is a three-dimensional schematic diagram of the mold base;

[0038] Fig.12 It is a three-dimensional schematic diagram of the detailed structure of the mold base;

[0039] Fig.13 It is a three-dimensional schematic diagram of a U-shaped plug-in fixing bolt;

[0040] Fig.14 It is a three-dimensional schematic diagram of the unit half mold structure.

[0041] Description of the accompanying drawings: 1-top reserved hole, 2-test piece, 3-bottom embedded screw, 4-fixed ring plate, 5-vertical rod, 6-U-shaped plug-in fixing bolt, 7-semicircular unit mold, 8-ear plate reserved hole, 9-splicing ear plate, 10-nut, 11-insertion rod, 12-slide groove, 13-splicing, 14-base, 15-cross bar, 16-fixing nut, 17-shelf hole, 18-base reserved hole, 19-template base, 20-jack, 21-L-shaped plug rod, 22-reserved jack, 23-shock-absorbing base, 24- Stabilize the base plate, 25-screw socket, 26-screw nut, 27-horizontal plug rod, 28-annular collar, 29-suspension plate, 30-vertical pole, 31-reserved hole, 32-meter rod, 33-electronic digital display, 34-support rod, 35-adjusting bolt, 36-fixing ferrule, 37-screw hole, 38-adjusting nut, 39-contact rod, 40-fixed base plate, 41-ferrule screw hole, 42-screw rod, 43-optical cable, 44-data acquisition system, 45-tin-platinum sheet, 46-vertical pole reserved hole, 47-ring reserved hole. DETAILED DESCRIPTION

[0042] The present invention is further described below in conjunction with embodiments. The description of the following embodiments is only used to help understand the present invention. It should be noted that for ordinary persons in the art, without departing from the principle of the present invention, the present invention can also be modified in some ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0043] Embodiment 1

[0044] As an embodiment, the concrete shrinkage test device mainly comprises: a shrinkage test piece high turnover rate preparation mold and a shrinkage test vibration reduction test device;

[0045] The shrinkage test piece high turnover rate preparation mold is used for casting the test piece 2, which mainly includes: a semicircular unit mold 7, a base 14, and a template base 19. The two semicircular unit molds 7 are spliced ​​into an integral mold at the splicing point 13. The semicircular unit mold 7 is placed on the template base 19, and the semicircular unit mold 7 is arranged on both sides of the base 14 of the template base 19;

[0046] The shrinkage test vibration reduction test device is used for the shrinkage test of the concrete specimen 2, and mainly comprises: a shock-absorbing base 23, a stable base plate 24, an annular collar 28, a hanging plate 29, a vertical pole 30, a support rod 34, a fixed sleeve 36 and a data acquisition system 44. The shock-absorbing base 23 is made of foam material, and a stable base plate 24, a vertical pole 30, an electronic digital display 33, a support rod 34 and a data acquisition system 44 are arranged on the top of the shock-absorbing base 23. The vertical poles 30 are symmetrically arranged on both sides of the stable base plate 24, a fixed sleeve 36 is arranged on the top of the support rod 34, a hanging plate 29 is arranged on the side of the fixed sleeve 36, and the electronic digital display 33 is arranged on the hanging plate 29.

[0047] Embodiment 2

[0048] As another embodiment, this embodiment 2 proposes, based on the embodiment 1, a more specific concrete shrinkage test device, wherein the shrinkage specimen high turnover rate preparation mold:

[0049] It mainly includes: temporary template fixing parts, unit assembly molds and template base 19.

[0050] The temporary template fixing part is used for temporarily fixing the unit assembly mold, which comprises: a fixed ring plate 4, an L-shaped plug rod 21, and the L-shaped plug rod 21 is symmetrically arranged on the outer side of the fixed ring plate 4; the bottom of the vertical rod 5 is put on the fixed ring plate 4, the L-shaped plug rod 21 of the fixed ring plate 4 is placed in the socket 20, and the vertical rod 5 is placed in the slide groove 12.

[0051] The unit assembly mold is used for casting the specimen 2, and comprises: a vertical rod 5, a semicircular unit mold 7, ear plate reserved holes 8, splicing ear plates 9, and a cross bar 15. The semicircular unit mold 7 is provided with a cross bar 15 on the outside, and the cross bar 15 is connected to the inner side of the vertical rod 5. The splicing ear plates 9 of the semicircular unit mold 7 form a whole at the splicing point 13 and are fixed with U-shaped plug-in fixing bolts 6.

[0052] The template base 19 is used to support the unit assembly mold, which includes: a slide groove 12, a base 14, a shelf hole 17, a base reserved hole 18, and a plug hole 20. The top of the template base 19 is symmetrically provided with a slide groove 12, and the two sides of the slide groove 12 are symmetrically provided with multiple rows of plug holes 20. The center of the top of the template base 19 is provided with a base 14, and the top of the base 14 is provided with a shelf hole 17, and the outer side of the base 14 is provided with a base reserved hole 18;

[0053] It should be noted that the parts in this embodiment that are the same or similar to those in the first embodiment can be referenced to each other and will not be described in detail in this application.

[0054] Embodiment 3

[0055] As another embodiment, this embodiment 3 proposes a more specific concrete shrinkage test device based on the embodiments 1 and 2, wherein the shrinkage test vibration reduction test device is:

[0056] It includes: a specimen fixing frame, a test instrument shelf, a shock-absorbing base 23 and a data acquisition system 44.

[0057] The test instrument shelf is used to place the electronic digital display 33, which includes: a hanging plate 29, a support rod 34, an adjusting bolt 35, and a fixing hoop 36. The fixing hoop 36 is sleeved on the top of the support rod 34 and fixed by the adjusting bolt 35. The outside of the fixing hoop 36 is provided with a hanging plate 29;

[0058] The specimen fixing frame is used to stabilize the specimen 2, and comprises: a screw nut 26, a transverse rod 27, an annular collar 28, a vertical rod 30, and a fixed bottom plate 40. The transverse rod 27, the annular collar 28, and the vertical rod 30 constitute the overall frame of the specimen fixing frame. The vertical rod 30 is arranged on the top of the fixed bottom plate 40, and the side of the vertical rod 30 is provided with multiple rows of vertical rod reserved holes 46;

[0059] The shock-absorbing base 23 is used to fix the specimen fixing frame and the test instrument shelf. The top of the shock-absorbing base 23 is provided with a stable bottom plate 24, a support rod 34, a data acquisition system 44, and a fixed bottom plate 40;

[0060] The data acquisition system 44 is used to process the test data of the electronic digital display 33. The data acquisition system 44 is connected to the electronic digital display 33 through an optical cable 43. A meter rod 32 is provided at the bottom of the electronic digital display 33, and a contact rod 39 is provided at the bottom of the meter rod 32.

[0061] The top of the hanging plate 29 is provided with a reserved hole 31, and the side of the hanging plate 29 is provided with a screw hole 37. The meter rod 32 passes through the reserved hole 31, and then the adjusting nut 38 is inserted into the screw hole 37 for fixing; the outer side of the fixing hoop 36 is provided with a hoop screw hole 41, after the support rod 34 passes through the fixing hoop 36, the adjusting bolt 35 is inserted into the hoop screw hole 41 for fixing, and the support rod 34 is arranged next to the fixing bottom plate 24;

[0062] The top of the test piece 2 is provided with a top reserved hole 1, and the bottom of the test piece 2 is provided with a bottom embedded screw 3. The test piece 2 passes through the annular ring 28 and is placed on a stable bottom plate 24. The test piece 2 is provided with a tin-platinum sheet 45; the tin-platinum sheet 45 contacts the bottom of the contact rod 39.

[0063] Embodiment 4

[0064] As another embodiment, this embodiment 4, based on the embodiments 1 to 3, proposes an operation method of the concrete shrinkage test device, including the following steps:

[0065] Step 1. Prefabricate molds and shrinkage test device components in the factory: customize the fixing ring plate 4, U-shaped plug-in fixing bolts 6, semicircular unit mold 7, base 14, template base 19, shock-absorbing base 23, stable bottom plate 24, annular collar 28, hanging plate 29, vertical rod 30, support rod 34, fixing hoop 36 and other accessories in the factory. Specifically, L-shaped plug rods 21 are symmetrically arranged on the side of the fixing ring plate 4; a plurality of reserved sockets 22 are arranged at the bottom of the semicircular unit mold 7, splicing ear plates 9 are symmetrically welded at both ends of the semicircular unit mold 7, ear plate reserved holes 8 are arranged on the side of the splicing ear plates 9, and a cross bar 15 is welded to the semicircular unit mold 7, and the cross bar 15 is welded to the vertical rod 5; the base 14 is welded in the center of the top of the template base 19, and the top of the template base 19 is welded with a base 14. The slide groove 12 is cut symmetrically, and the insertion holes 20 are symmetrically arranged on the outer side of the slide groove 12, a shelf hole 17 is drilled on the top of the base 14, and a base reserved hole 18 is drilled on the side of the base 14; a stable base plate 24 is welded at the center of the top of the shock-absorbing base 23, and the fixed base plates 40 are symmetrically arranged on both sides of the fixed base plate 24, and a vertical pole 30 is welded on the top of the fixed base plate 40, a screw rod insertion hole 25 is drilled in the middle of the top of the stable base plate 24, and a vertical pole reserved hole 46 is drilled on the side of the vertical pole 30; a support rod 34 is welded on the top of the shock-absorbing base 23, a collar reserved hole 47 is drilled on the side of the annular collar 28, a collar screw hole 41 is drilled on the side of the fixed collar 36, a hanging plate 29 is welded on the side of the fixed collar 36, and reserved holes 31 and screw holes 37 are drilled on the top and side of the hanging plate 29 respectively;

[0066] Assembling the mold for preparing shrinkage specimens with high turnover rate: splice the two semicircular unit molds 7 on both sides of the base 14, then use the U-shaped plug-in fixing bolts 6 to pass through the ear plate reserved holes 8, and then fix them with fixing nuts 16; at the same time, put the fixing ring plate 4 on the bottom of the vertical rod 5, then place the vertical rod 5 in the slide groove 12, and insert the L-shaped plug rod 21 into the plug hole 20; at the same time, insert the plug rod 11 into the reserved plug hole 22 and the base reserved hole 18 in turn, and fix them with nuts 10;

[0067] Step 2, preparation of the test piece 2: before preparing the mold assembly, first place the bottom embedded screw 3 in the shelf hole 17, then pour the concrete of the test piece 2, and at the same time, set the top reserved hole 1 on the top of the test piece 2;

[0068] Curing and demoulding of specimen 2: After the specimen 2 is formed, the surface is smoothed and covered with plastic wrap, and the entire semicircular unit mold 7 is required to be sealed and wrapped; loosen the fixing nut 16, nut 10 and L-shaped plug rod 21, and then slide the vertical rod 5 to remove the semicircular unit mold 7, set the test room environment temperature to 20℃±2℃, and the relative humidity to 60%±5%, and then cure the specimen 2 to the specified number of days;

[0069] Step 3: Assembling the shrinkage test device: Connect the annular collar 28 to the vertical pole 30. Specifically, insert the transverse rod 27 into the vertical pole reserved hole 46 and the collar reserved hole 47 in sequence, and then fix them with the screw nut 26.

[0070] Place the test piece 2: install the cured test piece 2 in the annular collar 28, and install the bottom embedded screw 3 in the screw insertion hole 25. At the same time, install the tin-platinum sheet 45 with the screw rod 42 on the top of the test piece 2;

[0071] Step 4: Install the electronic digital display 33: Install the fixing hoop 36 on the top of the support rod 34, adjust it to a suitable height, insert the adjusting bolt 35 into the hoop screw hole 41, and fix it; put the meter rod 32 of the electronic digital display 33 into the reserved hole 31, and make the contact rod 39 at the bottom of the meter rod 32 contact with the tin-platinum sheet 45, and then insert the adjusting nut 38 into the screw hole 37 and fix it;

[0072] Connecting to the data acquisition system 44: connecting the electronic digital display 33 to the data acquisition system 44 with an optical cable 43;

[0073] Step 5: Test specimen 2 for shrinkage test: adjust the initial scale of the electronic digital display 33 to zero, then measure data using the electronic digital display 33, read and record the data, and repeat the test three times;

[0074] Calculate the average shrinkage rate of the test piece 2: Utilize the data acquisition system 44 to calculate the shrinkage rate of the three test data recorded by the electronic digital display meter 33, and calculate the arithmetic mean value.

[0075] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

Claims

1. A concrete shrinkage test device, characterized in that: include: Test pieces, shrinkage test pieces high turnover preparation molds and shrinkage test vibration reduction test equipment; The shrinkage test piece high turnover rate preparation mold is used for casting the test piece, and comprises: a semicircular unit mold, a base and a template base, two semicircular unit molds are spliced ​​into an integral mold, the semicircular unit mold is placed on the template base, and the semicircular unit mold is arranged on both sides of the base of the template base; The shrinkage test vibration reduction test device is used for the shrinkage test of the specimen, and includes a shock-absorbing base. The top of the shock-absorbing base is provided with a stable base plate, a vertical pole, an electronic digital display, a support rod and a data acquisition system. The vertical poles are symmetrically arranged on both sides of the stable base plate. The top of the support rod is provided with a fixed hoop, and a hanging plate is provided on the side of the fixed hoop. The electronic digital display is arranged on the hanging plate, and the bottom end contacts the top surface of the specimen.

2. An operating method of the concrete shrinkage test device according to claim 1, characterized in that: The following steps are involved: Step 1: Splice the two semicircular unit molds on both sides of the base, put the fixed ring plate on the bottom of the vertical rod, then place the vertical rod in the slide groove, and insert the L-shaped plug rod into the socket; Step 2: Place the bottom embedded screw in the resting hole, and then pour the specimen concrete. At the same time, set a top reserved hole on the top of the specimen; remove the mold after pouring the specimen; Step 3: Connect the annular collar to the vertical pole, install the test piece in the annular collar, and install a tin-platinum sheet with a screw rod on the top of the test piece; Step 4: Install the fixed hoop on the top of the support rod, adjust the height and install the electronic digital display, so that the contact rod at the bottom of the electronic digital display contacts the tin-platinum sheet on the top of the test piece; Step 5: Adjust the initial scale of the electronic digital display to zero, and then use the electronic digital display to measure the data, calculate the shrinkage rate, and calculate the arithmetic mean.

3. The operating method of the concrete shrinkage test device according to claim 2, characterized in that: The high-turnover preparation mold for shrinkage specimens includes: a temporary template fixing part, a unit assembly mold and a template base; slide grooves are opened on both sides of the template base, and multiple rows of sockets are symmetrically arranged on both sides of the slide grooves, and two temporary template fixing parts are installed on the slide grooves; a base is provided in the center of the top of the template base, and the unit assembly mold includes a vertical rod and a semicircular unit mold, the two vertical rods are installed on the temporary template fixing part, and the two semicircular unit molds are closed to form a cylindrical mold, the cylindrical mold is inserted on the base, and the cylindrical mold is installed between the two vertical rods through a cross bar.

4. The operating method of the concrete shrinkage test device according to claim 2, characterized in that: The shrinkage test vibration reduction test device includes: a specimen fixing frame, a test instrument shelf, a shock-absorbing base and a data acquisition system; the specimen fixing frame, the test instrument shelf and the data acquisition system are all arranged on the shock-absorbing base; the test instrument shelf includes a support rod, and the top end of the support rod is provided with a hanging plate on the outside of a fixed sleeve; an electronic digital display is installed on the hanging plate; the specimen fixing frame includes a vertical pole, and a plurality of horizontal plug rods are provided on the side of the vertical pole, and the ends of the horizontal plug rods are connected to annular rings, and several annular rings are sleeved on the specimen; the data acquisition system is used to process the data tested by the electronic digital display, and a table rod is provided under the bottom of the electronic digital display, and a contact rod is provided at the lower part of the table rod, and the contact rod contacts the top surface of the specimen.

5. The operating method of the concrete shrinkage test device according to claim 3, characterized in that: The temporary fixing part of the template includes a fixed ring plate and an L-shaped plug rod, and the L-shaped plug rod is symmetrically arranged on the outer side of the fixed ring plate; the bottom of the vertical rod is sleeved on the fixed ring plate, the L-shaped plug rod of the fixed ring plate is placed in the insertion hole, and the vertical rod is placed in the slide groove.

6. The operating method of the concrete shrinkage test device according to claim 3, characterized in that: A reserved socket is provided at the bottom of the semicircular unit mold, and a base reserved hole is provided on the outside of the base. The base reserved hole and the reserved socket are connected by an insertion rod and fastened with a nut; a shelf hole is provided at the top of the base, a bottom embedded screw is embedded in the central bottom of the specimen, and a top reserved hole is provided at the top of the specimen, and the bottom embedded screw is placed in the shelf hole.

7. The operating method of the concrete shrinkage test device according to claim 4, characterized in that: The test instrument shelf comprises: a hanging plate, a supporting rod, an adjusting bolt and a fixing hoop. The fixing hoop is sleeved on the top of the supporting rod and fixed with the adjusting bolt. A hanging plate is arranged on the outside of the fixing hoop. A reserved hole is arranged on the top of the hanging plate, and a screw hole is arranged on the side of the hanging plate. The meter rod passes through the reserved hole, and then the adjusting nut is inserted into the screw hole for fixing. A hoop screw hole is arranged on the outside of the fixing hoop. The supporting rod passes through the fixing hoop, and the adjusting bolt is inserted into the hoop screw hole.

8. The operating method of the concrete shrinkage testing device according to claim 4, characterized in that: The specimen fixing frame is used for stabilizing the specimen, and comprises: a nut, a transverse rod, an annular collar, a vertical rod and a fixed base plate. The transverse rod, annular collar and vertical rod constitute the overall frame of the specimen fixing frame. The top of the fixed base plate is provided with a vertical rod, and the side of the vertical rod is provided with multiple rows of vertical rod reserved holes; one end of the transverse rod is inserted into the vertical rod reserved hole, and the other end is connected to the annular collar, and the annular collar is sleeved on the specimen; the fixed base plate is symmetrically arranged on the shock-absorbing base on both sides of the stable base plate, and the transverse rod passes through the vertical rod reserved hole and the collar reserved hole in turn, and is fixed with a nut.

9. The method for operating the concrete shrinkage test device according to claim 4, characterized in that: A top reserved hole is provided on the top of the specimen, a bottom embedded screw is provided on the bottom of the specimen, the specimen is placed on a stable bottom plate after passing through an annular collar, and a tin-platinum sheet is provided on the top of the specimen; a screw plug hole is provided on the top of the stable bottom plate, and the stable bottom plate is arranged at the top center of the shock-absorbing base; the bottom embedded screw is placed in the screw plug hole, the screw rod is placed in the top reserved hole, a tin-platinum sheet is provided on the top of the screw rod, and the tin-platinum sheet is in contact with the bottom of the contact rod.

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