Drying shrinkage experiment device and method suitable for premixed flow-state solidified soil

Abstract

The invention relates to the technical field of premixed flow state solidified soil, and discloses a drying shrinkage experiment device and method suitable for premixed flow state solidified soil, the device comprises an experiment box body, the bottom end of the box body is provided with a base, the front side is provided with a sealing door with an observation window, and the surface is provided with a workpiece placing mechanism, a shrinkage detection mechanism and an experiment environment control mechanism; the workpiece placing mechanism comprises a taking-out assembly and eight groups of rotatable placing assemblies, and can synchronously test multiple groups of test pieces; the experimental environment control mechanism realizes simulation of multiple working conditions such as constant temperature and humidity, high-temperature drying and the like through multiple groups of main fans, auxiliary fans, electric heating tubes and temperature, humidity and wind speed sensors, and ensures that the environment is uniform and stable; the shrinkage detection mechanism adopts a laser displacement sensor and a crack monitoring camera, interference of a test piece is avoided through non-contact measurement, data are collected in a full-automatic mode, the experiment efficiency and the data accuracy are greatly improved, and reliable support is provided for quality control of the premixed flow-state solidified soil.

Description

Technical Field

[0001] This invention relates to the field of premixed fluidized solidified soil technology, specifically to a drying shrinkage test apparatus and method suitable for premixed fluidized solidified soil. Background Technology

[0002] Premixed fluidized solidified soil is a fluidized environmentally friendly material made from soil, solidifying agent, water and admixtures through industrial premixing. It is widely used in engineering projects such as roadbed backfilling and foundation pit backfilling. Drying shrinkage is its key performance indicator. Excessive shrinkage can lead to cracking, affecting the durability and safety of the project. At present, drying shrinkage tests mostly refer to the test methods of ordinary cement concrete, using contact displacement sensors to manually measure the shrinkage deformation of a single specimen under constant environment.

[0003] Regarding the above description, the applicant believes the following issues exist: Existing devices have low overall efficiency, and can only test one specimen per experiment. Premixed fluidized solidified soil has a variety of mix proportions, requiring a large number of parallel experiments, which is time-consuming and labor-intensive. Manual reading and recording are required, which can easily introduce subjective errors. Furthermore, continuous, all-weather monitoring cannot be achieved. They can usually only provide a constant temperature and humidity environment, which cannot simulate the complex working conditions of alternating temperature and humidity changes in actual engineering projects. Therefore, it is difficult to truly reflect the service performance of materials. At the same time, contact measurements such as dial gauges may generate contact stress on lightweight, low-strength solidified soil specimens, affecting measurement accuracy.

[0004] Therefore, developing a drying shrinkage experimental device and method that can achieve multi-channel, automated, non-contact measurement and dynamic control of environmental parameters is of great significance for promoting the quality control and technological development of premixed fluidized solidified soil. Summary of the Invention

[0005] The purpose of this invention is to provide a drying shrinkage test apparatus and method suitable for premixed fluidized solidified soil, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a drying shrinkage test device and method suitable for premixed fluidized solidified soil, comprising a test chamber, a base fixedly connected to the bottom of the test chamber, a sealed door installed on the front of the test chamber, an observation window fixedly connected to the front of the sealed door, and a workpiece placement mechanism provided on the surface of the test chamber. The workpiece placement mechanism includes a take-out component and a rotatable placement component, a shrinkage detection mechanism provided on the surface of the rotatable placement component, and an experimental environment control mechanism provided on the surface of the test chamber. The experimental environment control mechanism includes a top-detachable mounting box, which is installed on the top of the experimental chamber. A main fan is installed inside the top-detachable mounting box. A first perforated air distribution plate is installed at the top of the experimental chamber. A fixed support is fixedly connected to the back of the experimental chamber, and a heating element is installed inside the fixed support. A support plate is installed inside the experimental chamber, with a temperature sensor and a humidity sensor installed at the top center of the support plate. Side-detachable mounting boxes are installed at both ends of the experimental chamber, each containing an auxiliary fan. Second perforated air distribution plates are installed at both ends of the experimental chamber. Wind speed sensors are installed at the top and bottom of both ends of the experimental chamber. A control panel is installed on the top left side of the experimental chamber. Simultaneously, eight groups of specimens were tested. The multi-channel design allows for the simultaneous testing of multiple specimens with the same or different mix proportions, greatly improving experimental efficiency and meeting the needs of large-scale mix proportion optimization experiments for premixed fluidized solidified soil. Furthermore, the experimental environment control mechanism allows for convenient adjustment of the internal experimental environment. The main fan dries the premixed fluidized solidified soil specimens to meet the requirements of constant low-temperature environment simulation experiments. Working in conjunction with a wind speed sensor, when the wind speed inside the experimental chamber is lower than the set wind speed, the corresponding auxiliary fan operates to compensate for the airflow until the wind speed uniformity inside the chamber reaches the standard. When simulating high-temperature drying conditions, the heating element operates to heat the air inside the experimental chamber. The experimental environment control mechanism enables various testing requirements to be met, greatly enhancing the accuracy of the test data.

[0007] Preferably, the top detachable mounting box, the main fan, and the first multi-hole diverter plate are one-to-one, and eight sets of the top detachable mounting box, the main fan, and the first multi-hole diverter plate are provided.

[0008] Preferably, the side detachable mounting housing, the auxiliary fan, and the second multi-hole diverter plate are one-to-one, and there are four sets of the side detachable mounting housing, the auxiliary fan, and the second multi-hole diverter plate on each side.

[0009] Preferably, the extraction component includes a plug-in frame, which is fixedly connected to the bottom of the middle section of the left and right ends inside the experimental chamber. A support plate is inserted into the plug-in frame. A back frame is fixedly connected to the bottom of the middle section of the back of the experimental chamber. A controller is installed at the center of the back of the back frame. An electrically controlled telescopic push rod is installed on the front of the controller. A connecting frame is installed on the back of the support plate. A base frame is fixedly connected to the bottom of the support plate.

[0010] Preferably, the electrically controlled telescopic push rod is controlled by a controller, and the end of the electrically controlled telescopic push rod away from the controller is installed at the center of the back of the connecting frame.

[0011] Preferably, the rotatable placement component includes a rotating groove, which is formed on the top of the support plate. A motor frame is installed on the top of the base frame, and a servo control motor is installed inside the motor frame. A connecting shaft is provided on the top of the servo control motor. A rotating seat is provided inside the rotating groove. A slot is formed at the outer end of the top surface of the rotating seat. A baffle is fixedly connected to the inner end of the top surface of the rotating seat. A detachable limiting baffle is installed at the outer end of the top of the rotating seat. An insert is fixedly connected to the bottom of the detachable limiting baffle.

[0012] Preferably, the connecting shaft is fixedly connected to the top output end of the servo control motor, the top of the connecting shaft is fixedly connected to the bottom center of the rotating seat, the detachable limiting baffle lifting block is inserted into the slot, a premixed fluidized solidified soil test piece is provided between the baffle and the detachable limiting baffle, and eight sets of the rotatable placement assembly are provided.

[0013] Preferably, the shrinkage detection mechanism includes a fixed frame, which is fixedly connected to the top of the baffle. A bidirectional screw is rotatably connected inside the fixed frame. A servo motor is installed at the outer end of the fixed frame, and a motor protective housing is installed at the outer end of the fixed frame. Connecting mounting seats are provided at the left and right ends of the surface of the bidirectional screw. A sensor mounting bracket is fixedly connected to the top of the connecting mounting seat. A laser displacement sensor is installed inside the sensor mounting bracket. An auxiliary bracket is fixedly connected to the back of the fixed frame. A specimen surface crack monitoring camera is installed at the end of the auxiliary bracket facing the fixed frame. Non-contact optical measurement is used, avoiding interference from contact stress on the specimen. The measurement accuracy is high, and the fully automatic data acquisition eliminates human error. It can achieve long-term uninterrupted monitoring and obtain complete and continuous shrinkage process data. By working in conjunction with multiple sets of laser displacement sensors and specimen surface crack monitoring cameras, the efficiency is greatly improved compared to traditional manual measurement of a single specimen, and multiple mix ratio optimization experiments can be completed quickly.

[0014] Preferably, the bidirectional screw is fixedly connected to the output end of the servo motor, the servo motor is located inside the motor protective housing, the shrinkage detection mechanism is provided in eight sets, and the bottom end of the connecting mounting base is threadedly connected to the surface of the bidirectional screw.

[0015] Another technical problem this invention aims to solve is to provide a drying shrinkage test method suitable for premixed fluidized solidified soil, thereby addressing the issues raised in the background section above: S1. Specimen Preparation and Installation The premixed fluidized solidified soil is poured into a mold of specified size, vibrated and smoothed, and placed in a standard curing environment for curing until the specified age. Depending on the requirements, the mold is removed after 24 hours or 48 hours, and the specimen is immediately transferred to the rotating seat in the test chamber to ensure that its free end is within the measurement range of the laser displacement sensor. S2, System Initialization The initial environmental parameters can be set through the central control system, and the temperature, humidity and wind speed inside the experimental chamber can be adjusted to the required experimental conditions, as well as the data acquisition frequency and total experimental duration. Constant environmental conditions can be set, or dynamic programs for temperature and humidity changes over time can be set. S3. Experimental Operation and Data Acquisition When the device is started, the environmental control system begins to work, so that the environment inside the chamber quickly reaches and stabilizes at the set value. Each group of components inside the device automatically and synchronously measures the shrinkage deformation value of all specimens at a set frequency, and transmits the data to the central control system in real time for storage and processing. S4. Data Processing and Analysis After the experiment, the data is exported through the control software, the drying shrinkage rate of each specimen at different ages is calculated, and the drying shrinkage rate-time curve, drying shrinkage rate-water loss curve, etc. can be plotted to obtain accurate experimental data.

[0016] Compared with the prior art, the present invention provides a drying shrinkage test device and method suitable for premixed fluidized solidified soil, which has the following beneficial effects: This invention can simultaneously conduct experiments on eight groups of specimens. Its multi-channel design allows for the simultaneous testing of multiple specimens with the same or different mix proportions, significantly improving experimental efficiency and meeting the needs of large-scale mix proportion optimization experiments for premixed fluidized bed soil. Furthermore, the experimental environment control mechanism allows for convenient adjustment of the internal experimental environment. The main fan dries the premixed fluidized bed soil specimens, meeting the requirements of constant low-temperature environment simulation experiments. Working in conjunction with a wind speed sensor, when the wind speed inside the experimental chamber is lower than the set wind speed, the corresponding auxiliary fan operates to compensate for the airflow until the wind speed uniformity within the chamber reaches the standard. When simulating high-temperature drying conditions, the heating element operates to heat the air inside the experimental chamber. The experimental environment control mechanism enables various testing requirements, greatly enhancing the accuracy of the test data.

[0017] This invention employs non-contact optical measurement, avoiding interference from contact stress on the specimen. It boasts high measurement accuracy, and fully automated data acquisition eliminates human error. It enables long-term, uninterrupted monitoring, acquiring complete and continuous shrinkage process data. Through the coordinated operation of multiple sets of laser displacement sensors and specimen surface crack monitoring cameras, efficiency is greatly improved compared to traditional manual measurement of a single specimen, allowing for the rapid completion of multi-mix ratio optimization experiments.

[0018] The invention integrates a multi-factor collaborative control system for temperature, humidity, and wind, which not only provides a constant environment as required by standards, but also programmatically simulates complex and variable climatic conditions in actual engineering, making the experimental results more instructive. At the same time, the central control system realizes centralized management of the entire experimental process and all data, facilitating data traceability, analysis, and report generation. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort: Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the component removal structure of the present invention; Figure 4 This is a schematic diagram of the rotatable component of the present invention; Figure 5 This is a schematic diagram of the heating element structure of the present invention; Figure 6 This is a schematic diagram of the experimental environment control mechanism of the present invention.

[0020] In the diagram: 1. Base; 2. Experimental chamber; 3. Sealed door; 4. Observation window; 5. Workpiece placement mechanism; 51. Removal assembly; 511. Insertion frame; 512. Bearing plate; 513. Back frame; 514. Controller; 515. Electrically controlled telescopic push rod; 516. Connecting frame; 517. Base frame; 52. Rotatable placement assembly; 521. Rotating slot; 522. Motor frame; 523. Servo control motor; 524. Connecting shaft; 525. Rotating seat; 526. Slot; 527. Baffle; 528. Removable limit baffle; 529. Insert block; 6. Shrinkage detection mechanism; 61. Fixing frame; 62. Bidirectional 63. Screw; 64. Servo motor; 65. Motor protective housing; 66. Connecting mounting base; 67. Sensor mounting bracket; 68. Laser displacement sensor; 69. Auxiliary bracket; 70. Specimen surface crack monitoring camera; 71. Experimental environment control mechanism; 72. Top detachable mounting box; 73. Main fan; 74. First porous diverter plate; 75. Fixed support; 76. Heating tube; 77. Temperature sensor; 78. Humidity sensor; 79. Side detachable mounting box; 701. Auxiliary fan; 702. Second porous diverter plate; 703. Wind speed sensor; 704. Control panel; 8. Premixed fluidized solidified soil experimental specimen. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Example 1

[0023] Please see Figure 1-6 The present invention provides a technical solution: a drying shrinkage test device and method for premixed fluidized solidified soil includes a test chamber 2, a base 1 fixedly connected to the bottom of the test chamber 2, a sealed door 3 installed on the front of the test chamber 2, an observation window 4 fixedly connected to the front of the sealed door 3, a workpiece placement mechanism 5 provided on the surface of the test chamber 2, the workpiece placement mechanism 5 includes a take-out component 51 and a rotatable placement component 52, a shrinkage detection mechanism 6 provided on the surface of the rotatable placement component 52, and an experimental environment control mechanism 7 provided on the surface of the test chamber 2; The experimental environment control mechanism 7 includes a top-detachable mounting box 71, which is installed on the top of the experimental chamber 2. A main fan 72 is installed inside the top-detachable mounting box 71. A first perforated flow divider 73 is installed on the top of the experimental chamber 2. A fixed support 74 is fixedly connected to the back of the experimental chamber 2, and a heating element 75 is installed inside the fixed support 74. A support plate 512 is installed inside the experimental chamber 2. A temperature sensor 76 and a humidity sensor 77 are installed on the top middle section of the support plate 512. Side-detachable mounting boxes 78 are installed on both sides of the experimental chamber 2, and auxiliary fans 79 are installed inside the side-detachable mounting boxes 78. Second perforated flow dividers 701 are installed on both sides of the experimental chamber 2. Wind speed sensors 702 are installed on the top and bottom of both sides of the experimental chamber 2. A control panel 7 is installed on the top left side of the experimental chamber 2. 03. It can simultaneously conduct experiments on eight groups of specimens. Through the multi-channel design, it can simultaneously test multiple specimens with the same or different mix proportions, which greatly improves experimental efficiency and meets the needs of large-scale mix proportion optimization experiments of premixed fluidized solidified soil. At the same time, the experimental environment control mechanism 7 of this device can conveniently adjust the experimental environment inside the experimental chamber 2. The main fan 72 dries the premixed fluidized solidified soil specimen 8 to meet the needs of constant medium and low temperature environment simulation experiments. It works in conjunction with the wind speed sensor 702. When the wind speed inside the experimental chamber 2 is lower than the set wind speed, the corresponding auxiliary fan 79 works to compensate for the airflow until the wind speed uniformity inside the chamber reaches the standard. When it is necessary to simulate high temperature drying conditions, the electric heating tube 75 works to heat the air inside the experimental chamber 2. Through the setting of the experimental environment control mechanism 7, a variety of different detection needs can be realized, which greatly enhances the accuracy of the detection data. The top detachable mounting box 71, the main fan 72 and the first multi-hole diverter plate 73 correspond one-to-one, and there are eight sets of the top detachable mounting box 71, the main fan 72 and the first multi-hole diverter plate 73. The side-detachable mounting box 78, the auxiliary fan 79, and the second multi-hole diverter plate 701 are arranged in a one-to-one correspondence, and there are four sets of the side-detachable mounting box 78, the auxiliary fan 79, and the second multi-hole diverter plate 701 on the left and right sides respectively. Example 2

[0024] Please see Figure 1-6 Furthermore, based on Embodiment 1, the extraction component 51 further includes an insertion frame 511, which is fixedly connected to the bottom of the middle section of the left and right ends inside the experimental chamber 2. A bearing plate 512 is inserted inside the insertion frame 511. A back frame 513 is fixedly connected to the bottom of the middle section of the back of the experimental chamber 2. A controller 514 is installed at the center of the back of the back frame 513. An electrically controlled telescopic push rod 515 is installed on the front of the controller 514. A connecting frame 516 is installed on the back of the bearing plate 512. A base frame 517 is fixedly connected to the bottom of the bearing plate 512. The electrically controlled telescopic push rod 515 is controlled by the controller 514. The end of the electrically controlled telescopic push rod 515 away from the controller 514 is installed at the center of the back of the connecting frame 516. The rotatable placement component 52 includes a rotating groove 521, which is opened on the top of the support plate 512. A motor frame 522 is installed on the top of the base frame 517. A servo control motor 523 is installed inside the motor frame 522. A connecting shaft 524 is provided on the top of the servo control motor 523. A rotating seat 525 is provided inside the rotating groove 521. A slot 526 is opened at the outer end of the top surface of the rotating seat 525. A baffle 527 is fixedly connected to the inner end of the top surface of the rotating seat 525. A detachable limiting baffle 528 is installed at the outer end of the top of the rotating seat 525. A plug block 529 is fixedly connected to the bottom of the detachable limiting baffle 528. The connecting shaft 524 is fixedly connected to the top output end of the servo control motor 523. The top of the connecting shaft 524 is fixedly connected to the bottom center of the rotating seat 525. The detachable limiting baffle 528 raises the insert block 529 and inserts it into the slot 526. A premixed fluidized solidified soil test piece 8 is provided between the baffle 527 and the detachable limiting baffle 528. The rotatable placement assembly 52 is provided with eight sets. The bottom end of the connecting mounting base 65 is threadedly connected to the surface of the bidirectional screw 62. The shrinkage detection mechanism 6 includes a fixed frame 61, which is fixedly connected to the top of the baffle 527. A bidirectional screw 62 is rotatably connected inside the fixed frame 61. A servo motor 63 is installed at the outer end of the fixed frame 61, and a motor protective housing 64 is installed at the outer end of the fixed frame 61. Connecting mounting seats 65 are provided at the left and right ends of the surface of the bidirectional screw 62. A sensor mounting bracket 66 is fixedly connected to the top of the connecting mounting seat 65. A laser displacement sensor 67 is installed at the inner end of the sensor mounting bracket 66. An auxiliary bracket 68 is fixedly connected to the back of the fixed frame 61. A specimen surface crack monitoring camera 69 is installed at the end of the auxiliary bracket 68 facing the fixed frame 61. Non-contact optical measurement is used to avoid interference from contact stress on the specimen. The measurement accuracy is high, and the fully automatic data acquisition eliminates human error. It can realize long-term uninterrupted monitoring and obtain complete and continuous shrinkage process data. Through the cooperation of multiple sets of laser displacement sensors 67 and specimen surface crack monitoring cameras 69, the efficiency is greatly improved compared with the traditional manual measurement of a single specimen. It can quickly complete multi-mix ratio optimization experiments. The bidirectional screw 62 is fixedly connected to the output end of the servo motor 63, which is located inside the motor protective housing 64. The shrinkage detection mechanism 6 is provided with eight sets.

[0025] To address another technical problem, this invention provides a drying shrinkage test method suitable for premixed fluidized solidified soil. The drying shrinkage test method includes the following steps: S1. Specimen Preparation and Installation The premixed fluidized solidified soil is poured into a mold of specified size, vibrated and smoothed, and placed in a standard curing environment for curing until the specified age. Depending on the requirements, the mold is removed after 24 hours or 48 hours, and the specimen is immediately transferred to the rotating seat 525 in the test chamber 2, ensuring that its free end is within the measurement range of the laser displacement sensor 67. S2, System Initialization The initial environmental parameters can be set through the central control system, and the temperature, humidity and wind speed inside the experimental chamber 2 can be adjusted to the required experimental conditions, as well as the data acquisition frequency and total experimental duration. Constant environmental conditions can be set, or dynamic programs for temperature and humidity changes over time can be set. S3. Experimental Operation and Data Acquisition When the device is started, the environmental control system begins to work, so that the environment inside the chamber quickly reaches and stabilizes at the set value. Each group of components inside the device automatically and synchronously measures the shrinkage deformation value of all specimens at a set frequency, and transmits the data to the central control system in real time for storage and processing. S4. Data Processing and Analysis After the experiment, the data is exported through the control software, the drying shrinkage rate of each specimen at different ages is calculated, and the drying shrinkage rate-time curve, drying shrinkage rate-water loss curve, etc. can be plotted to obtain accurate experimental data.

[0026] In actual operation, when this device is used, the premixed fluidized solidified soil is poured into a mold of specified size, vibrated and smoothed, and placed in a standard curing environment for curing until the specified age. The mold is removed after 24 hours or 48 hours as required. After the premixed fluidized solidified soil test specimen 8 is formed, the sealed door 3 is opened, and the electric telescopic push rod 515 is controlled by the controller 514 to push the bearing plate 512 out of the test chamber 2. The specimen is immediately transferred to the rotating seat 525 inside the test chamber 2, ensuring that its free end is within the measurement range of the laser displacement sensor 67. According to the size of the premixed fluidized solidified soil test specimen 8, the staff inserts the detachable limiting baffle 528 into the appropriate slot 526 to stably place the premixed fluidized solidified soil test specimen 8. After placement, the bearing plate 512 is pulled back into the test chamber 2 by the controller 514 and the electric telescopic push rod 515, and the sealed door 3 is closed to carry out the experiment. The initial environmental parameters are set through the central control system, and the temperature, humidity and wind speed inside the experimental chamber 2 are adjusted to the required experimental conditions, as well as the data acquisition frequency and total experimental time. Constant environmental conditions can be set, or a dynamic program for temperature and humidity changes over time can be set. When the device is started, the environmental control system starts working, so that the environment inside the chamber quickly reaches and stabilizes at the set value. Each group of components inside the device automatically and synchronously measures the shrinkage deformation value of all specimens at the set frequency, and transmits the data to the central control system in real time for storage and processing. The device can simultaneously conduct experiments on eight groups of specimens. Through its multi-channel design, it can simultaneously test multiple specimens with the same or different mix proportions, greatly improving experimental efficiency and meeting the needs of large-scale mix proportion optimization experiments for premixed fluidized solidified soil. At the same time, the experimental environment control mechanism 7 of the device can conveniently adjust the experimental environment inside the experimental chamber 2. The main fan 72 dries the premixed fluidized solidified soil specimens 8 to meet the needs of constant low-temperature environment simulation experiments. It works in conjunction with the wind speed sensor 702. When the wind speed inside the experimental chamber 2 is lower than the set wind speed, the corresponding auxiliary fan 79 works to compensate for the airflow until the wind speed uniformity inside the chamber reaches the standard. When it is necessary to simulate high-temperature drying conditions, the heating tube 75 works to heat the air inside the experimental chamber 2. Through the setting of the experimental environment control mechanism 7, various different detection needs can be met, greatly enhancing the accuracy of the detection data. During operation, the servo control motor 523 controls the rotation of the connecting shaft 524, which drives the rotating seat 525 to rotate at a constant speed inside the rotating groove 521. This ensures that the premixed fluidized solidified soil test specimen 8 at the top can cooperate with the airflow design to achieve consistent wind speed on the surface of the specimen, so that the airflow blows evenly over the surface of each specimen, ensuring consistent drying conditions for specimens at different locations. During the experiment, the shrinkage detection mechanism 6 will detect the premixed fluidized solidified soil test specimen 8. The servo motor 63 drives the bidirectional screw 62 to rotate, which in turn drives the connecting mounting base 65 to move on the surface of the bidirectional screw 62 to achieve detection. The device adopts non-contact optical measurement, which avoids the interference of contact stress on the specimen. The measurement accuracy is high, and the fully automatic data acquisition eliminates human error. It can achieve long-term uninterrupted monitoring and obtain complete and continuous shrinkage history data. Through the cooperation of multiple sets of laser displacement sensors 67 and specimen surface crack monitoring camera 69, the efficiency is greatly improved compared with the traditional manual measurement of a single specimen. It can quickly complete multi-mix ratio optimization experiments. After the experiment, the data is exported through the control software, the drying shrinkage rate of each specimen at different ages is calculated, and the drying shrinkage rate-time curve, drying shrinkage rate-water loss curve, etc. can be plotted to obtain accurate experimental data.

[0027] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A device and method for dry shrinkage experiment of pre-mixed fluidified soil, comprising an experimental box (2), characterized in that: The experiment box (2) bottom fixedly connected with base (1), the experiment box (2) front installation has airtight door (3), the airtight door (3) front fixedly connected with observation window (4), the experiment box (2) surface is provided with workpiece placing mechanism (5). The workpiece placing mechanism (5) includes taking out assembly (51) and rotatable placing assembly (52), the rotatable placing assembly (52) surface is provided with contraction detection mechanism (6), the experiment box (2) surface is provided with experimental environment control mechanism (7); The experimental environment control mechanism (7) includes a detachable top box (71), the detachable top box (71) is installed on the top of the experiment box (2), the detachable top box (71) is installed with main fan (72) inside, the experiment box (2) is installed with first porous flow divider (73) inside top, the experiment box (2) is fixedly connected with fixed support (74) inside back, the fixed support (74) is installed with electric heating pipe (75) in the inner end, the experiment box (2) is provided with bearing plate (512), the bearing plate (512) top middle segment is installed with temperature sensor (76), the bearing plate (512) top middle segment is installed with humidity sensor (77), the experiment box (2) left and right ends are installed with side detachable installation box (78), the side detachable installation box (78) is installed with auxiliary fan (79) inside, the experiment box (2) left and right ends are installed with second porous flow divider (701) inside, the experiment box (2) left and right ends top and bottom are installed with wind speed sensor (702), the experiment box (2) left side top is installed with control panel (703).

2. The device and method for dry shrinkage test of pre-mixed fluidified soil according to claim 1, characterized in that: The detachable top box (71), main fan (72) and first porous flow divider (73) correspond one by one, the detachable top box (71), main fan (72) and first porous flow divider (73) are provided with eight groups.

3. The apparatus and method for dry shrinkage test of pre-mixed fluidified soil according to claim 1, wherein: The side detachable installation box (78), auxiliary fan (79) and second porous flow divider (701) correspond one by one, the side detachable installation box (78), auxiliary fan (79) and second porous flow divider (701) are provided with four groups on the left and right.

4. The apparatus and method for dry shrinkage test of pre-mixed fluidified soil according to claim 1, wherein: The taking out assembly (51) includes plug-in frame (511), the plug-in frame (511) is fixedly connected to the experiment box (2) inside left and right ends middle segment bottom, the plug-in frame (511) is inserted with bearing plate (512) inside, the experiment box (2) back middle segment bottom is fixedly connected with back frame (513), the back frame (513) back center is installed with controller (514), the controller (514) front is installed with electric control telescopic push rod (515), the bearing plate (512) back is installed with connecting frame (516), the bearing plate (512) bottom is fixedly connected with bottom bracket (517).

5. The apparatus and method for dry shrinkage test of pre-mixed fluidified soil according to claim 4, wherein: The electric control telescopic push rod (515) is controlled by the controller (514), and one end of the electric control telescopic push rod (515) away from the controller (514) is installed on the back center of the connecting frame (516).

6. The apparatus and method for dry shrinkage test of pre-mixed fluidified soil according to claim 1, wherein: The rotatable placing assembly (52) comprises a rotating groove (521) formed in the top of the bearing plate (512), a motor frame (522) installed on the top of the base frame (517), a servo control motor (523) installed in the motor frame (522), a connecting rotating shaft (524) arranged on the top of the servo control motor (523), a rotating seat (525) arranged in the rotating groove (521), a slot (526) formed in the outer end of the top surface of the rotating seat (525), a baffle (527) fixedly connected to the inner end of the top surface of the rotating seat (525), and a detachable limiting baffle (528) installed on the outer end of the top of the rotating seat (525).

7. The apparatus and method for dry shrinkage test of pre-mixed fluidified soil according to claim 6, wherein: The connecting rotating shaft (524) is fixedly connected to the top output end of the servo control motor (523), the top of the connecting rotating shaft (524) is fixedly connected to the bottom center of the rotating seat (525), the detachable limiting baffle (528) is inserted into the slot (526), and the pre-mixed flow state solidified soil test piece (8) is arranged between the baffle (527) and the detachable limiting baffle (528).

8. The apparatus and method for dry shrinkage test of pre-mixed fluidified soil according to claim 1, wherein: The shrinkage detection mechanism (6) comprises a fixed frame (61) fixedly connected to the top of the baffle (527), a bidirectional screw rod (62) rotatably connected to the inside of the fixed frame (61), a servo motor (63) installed on the outer end of the fixed frame (61), a motor protection shell (64) installed on the outer end of the fixed frame (61), a connecting mounting seat (65) arranged on the surface of the bidirectional screw rod (62), a sensor mounting frame (66) fixedly connected to the top of the connecting mounting seat (65), a laser displacement sensor (67) installed on the inner end of the sensor mounting frame (66), and a test piece surface crack monitoring camera (69) installed on one end of the surface of the auxiliary support (68) facing the fixed frame (61).

9. The apparatus and method for dry shrinkage test of pre-mixed fluidified soil according to claim 8, wherein: The bidirectional screw rod (62) is fixedly connected to the output end of the servo motor (63), the servo motor (63) is arranged in the motor protection shell (64), the shrinkage detection mechanism (6) is provided with eight groups, and the connecting mounting seat (65) is threadedly connected to the surface of the bidirectional screw rod (62).

10. A method for dry shrinkage test of pre-mixed fluidified soil, characterized in that: The above drying shrinkage test method comprises the following steps: S1, test piece preparation and installation The pre-mixed fluidified solidified soil is poured into a mold of a specified size, vibrated, leveled, and placed into a standard curing environment for curing to a specified age. After 24 hours or 48 hours, the mold is removed according to requirements, and the test piece is immediately transferred to a rotating seat (525) in the experimental box (2), ensuring that the free end is within the measurement range of the laser displacement sensor (67); S2, system initialization The initial environmental parameters are set by the central control system, the temperature, humidity, and wind speed inside the experimental box (2) are adjusted to the required experimental conditions, and the data acquisition frequency and total experimental duration are set. Constant environmental conditions can be set, or a dynamic program can be set for temperature and humidity changes over time. S3, experimental operation and data acquisition The device is started, and the environmental control system begins to work, allowing the box environment to quickly reach and stabilize at the set value. The internal components of the device automatically and synchronously measure the shrinkage deformation values of all test pieces at the set frequency, and the data is transmitted to the central control system for storage and processing in real time. S4, data processing and analysis After the experiment is completed, the data is exported through the control software, the drying shrinkage of each test piece at different ages is calculated, and the drying shrinkage-time curve and drying shrinkage-water loss rate curve can be drawn to obtain accurate experimental data.

Images