CN117538248A - Test device and method for measuring concrete setting time under high pressure - Google Patents
Test device and method for measuring concrete setting time under high pressure Download PDFInfo
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- CN117538248A CN117538248A CN202311649150.0A CN202311649150A CN117538248A CN 117538248 A CN117538248 A CN 117538248A CN 202311649150 A CN202311649150 A CN 202311649150A CN 117538248 A CN117538248 A CN 117538248A
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- 238000012360 testing method Methods 0.000 title claims abstract description 82
- 238000000034 method Methods 0.000 title claims abstract description 37
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- 230000008569 process Effects 0.000 claims abstract description 22
- 230000015271 coagulation Effects 0.000 claims abstract description 18
- 238000005345 coagulation Methods 0.000 claims abstract description 18
- 230000036571 hydration Effects 0.000 claims abstract description 14
- 238000006703 hydration reaction Methods 0.000 claims abstract description 14
- 238000007789 sealing Methods 0.000 claims description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 6
- 239000011521 glass Substances 0.000 claims description 6
- 239000000741 silica gel Substances 0.000 claims description 6
- 229910002027 silica gel Inorganic materials 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 abstract description 14
- 230000008859 change Effects 0.000 abstract description 5
- 230000009471 action Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 description 10
- 238000011161 development Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000003921 oil Substances 0.000 description 2
- 230000035515 penetration Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N19/00—Investigating materials by mechanical methods
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- Life Sciences & Earth Sciences (AREA)
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- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a test device for measuring concrete setting time under high pressure, which comprises a test barrel, a hydraulic loading system, a strain sensor and a supporting component, wherein the test barrel is arranged on the test barrel; the test mold bucket is a semi-sealed steel bucket with an opening at the top and is used for pouring concrete in the test process; the hydraulic loading system is used for applying high-pressure load to the concrete in the test barrel; the strain sensors are arranged in the test barrel; the support component is used for supporting the test barrel and the hydraulic loading system; the method can monitor the whole hydration and coagulation process of the concrete in a high-pressure state in real time, so as to determine the initial setting time and final setting time of the concrete; compared with the prior art, the device can determine the coagulation time by monitoring the strain change in the coagulation and hardening process under the action of high-pressure load, is simple to operate, can realize real-time continuous monitoring of the hydration process of the concrete in a closed environment, reduces the manual monitoring cost and the manual operation error, and improves the accuracy of test results.
Description
Technical Field
The invention relates to the technical field of hydraulic concrete material research, in particular to a test device and a method for measuring concrete setting time under high pressure.
Background
In recent years, the development of water conservancy and hydropower industry in China is rapid, and the development and construction of hydropower are gradually changed to western regions and high-altitude regions with complex comprehensive conditions; the western region has complex terrain conditions, the river cover layer is deep, a great amount of boulders and overhead phenomena are commonly existing in the river bed, and the severe geological conditions provide great challenges for the construction of the dam.
The concrete impervious wall is an important measure for ensuring smooth development of water and electricity under complex geological conditions, and can effectively improve the stability of foundation penetration and the safety performance of a gate dam; in the construction process of the concrete impervious wall, the concrete setting time is a decisive factor for controlling the construction progress and ensuring the wall forming quality; the concrete impervious wall belongs to underground hidden engineering, the depth of the concrete impervious wall is generally tens of meters or even hundreds of meters underground, a slurry is needed to fix the wall after the concrete impervious wall is formed into a groove, and the concrete is poured under the slurry to gradually reach the designed elevation; therefore, the diaphragm wall needs to bear the action of upper mud pressure after concrete pouring, the indoor maintenance condition and the site construction condition are huge in difference, and the concrete setting time measurement result is greatly different from the actual pouring condition result, so that the site construction progress and quality are affected, and no mature method exists for determining the concrete setting time under high-head mud pressure.
The traditional concrete setting time is determined by measuring the penetration degree of the measuring needle in the concrete mortar, and the method is simple and convenient to operate, but cannot realize continuous real-time monitoring, has large manual operation error and cannot operate in a high-pressure environment.
Therefore, aiming at the construction quality control of the ultra-deep underground diaphragm wall, development of a test device and a method for measuring the concrete setting time under high pressure is needed, and technical and theoretical guidance is provided for site construction.
Disclosure of Invention
In view of the above, the present invention provides a test device and a method for determining the setting time of concrete under high pressure, which overcome or at least partially solve the above-mentioned problems.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the test device for measuring the concrete setting time under high pressure comprises a test barrel, a hydraulic loading system, a strain sensor and a supporting component;
the test barrel is a semi-sealed steel barrel with an opening at the top and is used for pouring concrete in the test process;
the hydraulic loading system is used for applying high-pressure load to the concrete in the test barrel;
the number of the strain sensors is a plurality, and the strain sensors are arranged in the test barrel;
the support assembly is used for supporting the test barrel and the hydraulic loading system.
Preferably, the hydraulic loading system comprises a hydraulic cylinder, a pressure sensor, an axial piston push rod and a loading plate which are sequentially connected from top to bottom, and the loading plate is positioned above the opening of the test barrel.
Preferably, the loading plate is of a disc steel plate structure, and the diameter of the loading plate is equal to the diameter of the opening of the test barrel; the edge of the loading plate is provided with a circle of rubber water stop strips.
Preferably, the support assembly comprises a support base, a longitudinal support, and a cross beam support;
the support base is positioned below the test barrel;
the number of the longitudinal supporting pieces is two, and the two longitudinal supporting pieces are vertically arranged on two sides of the supporting base relatively;
the cross beam supports are horizontally arranged, and two ends of the cross beam supports are respectively and fixedly connected to the tops of the two longitudinal supporting pieces.
Preferably, a plurality of reinforcing ribs are provided between the cross beam support and both of the longitudinal supports.
Preferably, the hydraulic cylinder is connected to the middle part of the beam support through a pressure steel plate.
Preferably, the device further comprises a guide rod, a plurality of guide rods are vertically arranged on the periphery of the axial piston push rod, one ends of the guide rods are fixedly connected to the upper surface of the loading plate, and the other ends of the guide rods penetrate through the pressure steel plate and are in sliding connection with the pressure steel plate.
Preferably, a fixed backing plate is arranged between the support base and the test barrel.
Preferably, a wire plug is arranged at the bottom of the test barrel, and the wire plug is in sealing connection with the test barrel by adopting a silica gel sealing pad and glass cement.
The invention also provides a method for measuring the concrete setting time under high pressure, which adopts the test device and comprises the following steps:
s1, embedding a plurality of strain sensors in a test barrel; connecting wires of the strain sensors are led out through wire plugs and connected to a data acquisition instrument, and further sealing treatment is carried out on the wire plugs by adopting a silica gel sealing gasket and glass cement;
s2, pouring a concrete sample;
s3, controlling a hydraulic loading system to apply load to the concrete sample;
s4, analyzing the hydration and coagulation process.
Compared with the prior art, the invention discloses the test device and the method for measuring the concrete setting time under high pressure, which have the following beneficial effects:
the method can monitor the whole hydration and coagulation process of the concrete in a high-pressure state in real time, so as to determine the initial setting time and final setting time of the concrete; compared with the existing measuring technology, the invention can determine the coagulation time by monitoring the strain change in the coagulation and hardening process under the action of high-pressure load, and the test device has simple operation, can realize the real-time continuous monitoring of the hydration process of the concrete in a closed environment, simultaneously reduces the manual monitoring cost and the manual operation error, and improves the accuracy of the test result.
The invention can continuously apply high pressure to concrete through the hydraulic loading system, and simultaneously the loading plate, the rubber water stop bar and the test barrel form a sealed high-pressure maintenance chamber, and can simulate the high-pressure environment of concrete setting and hardening of a real impervious wall, thereby realizing the concrete hydration setting performance test under the high-pressure state.
According to the invention, the internal strain of the concrete sample is used as a monitoring variable parameter to reflect the coagulation hydration process of the concrete, the parameter is less influenced by the environment, the accuracy of a test result is improved, meanwhile, the strain change can dynamically reflect the whole coagulation hardening process of the concrete in real time, the initial coagulation time and the final coagulation time of the concrete can be determined by simply processing the monitoring data, the whole test process is simple, and the labor cost is low;
the test device provided by the invention has the advantages of simple structural design, convenience in operation, safety and reliability in sealing, low manufacturing cost, reusability, flexible arrangement of internal sensors, small influence of manual operation and high accuracy of measurement results; according to the invention, the closed high-pressure chamber is constructed to realize the real simulation of concrete setting and hardening of the ultra-deep impervious wall under the high-pressure state, the hydraulic loading system and the sensor monitoring system are utilized to realize the concrete setting time measurement and the real-time monitoring of the hydration process under the high-pressure state, so that a novel test device and a novel technical means are provided for the research of the influence mechanism of the high-pressure environment on the concrete hydration setting, and reliable theoretical guidance can be provided for practical engineering application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of the overall structure provided by the present invention;
FIG. 2 is a schematic view of a support assembly according to the present invention;
FIG. 3 is a schematic diagram of a hydraulic loading system according to the present invention;
wherein:
1. a hydraulic cylinder; 2. a guide rod; 3. an axial piston push rod; 4. a loading plate; 5. a test barrel; 6. fixing the backing plate; 7. a cross beam support; 8. reinforcing rib plates; 9. a longitudinal support; 10. a support base; 11. a pressure steel plate; 12. a pressure sensor.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-3, the embodiment of the invention discloses a test device for measuring concrete setting time under high pressure, which comprises a test barrel, a hydraulic loading system, a strain sensor and a supporting component.
The hydraulic loading system comprises a hydraulic cylinder 1, a pressure sensor 12, an axial piston push rod 3 and a loading plate 4 which are sequentially connected from top to bottom, and the loading plate 4 is positioned above an opening of the test barrel 5; the hydraulic cylinder 1 is connected with the axial piston push rod 3, and the axial piston push rod 3 is pushed up and down by controlling the oil pressure in the hydraulic cylinder 1, so that a high-pressure load is applied to the concrete sample in the test barrel 5.
In this embodiment, the axial piston push rod 3 has a diameter of 10cm and a height of 80cm; the pressure sensor 12 is connected with the top of the piston push rod 3 through a high-strength bolt and is mainly used for monitoring the applied pressure; the pressure sensor 12 is a conventional device, and will not be described in detail herein.
The hydraulic cylinder 1 is fixedly arranged on the high-strength pressure steel plate 11, 4 fixing holes are formed in two sides of the pressure steel plate 11, and the high-strength bolts are used for connecting the pressure steel plate 11 with the beam support 7, so that stability of a loading system is ensured.
In the embodiment, the number of the guide rods 2 is two, the two guide rods 2 are respectively arranged at two sides of the axial piston push rod 3, the diameter of the guide rods 2 is 5cm, and the height is 80cm, and the main function of the guide rods is to assist the axial piston push rod 3 to drive the loading plate 4 to move up and down; the bottoms of the guide rod 2 and the axial piston push rod 3 are fixedly connected with the loading plate 4 at the same time, and the top of the guide rod 2 passes through the pressure steel plate 11 and can slide up and down under the drive of the piston push rod 3.
In the embodiment, the loading plate 4 is a disc steel plate, the diameters of the disc steel plate and the test barrel 5 are kept consistent, the diameters of the disc steel plate and the test barrel are 50cm, and the height of the loading plate 4 is 5cm; a circle of rubber water stop strips are distributed on the edge of the loading plate 4, and gaps between the loading plate 4 and the test barrel 5 are filled, so that a sealed high-pressure maintenance cavity is formed.
In the embodiment, the test barrel 5 is a cylindrical steel barrel, the diameter is 50cm, the height is 60cm, and the thickness is 3cm; the strain sensor is embedded in the test barrel 5 in advance, a wire plug is arranged at the bottom, a connecting wire of the strain sensor is led out to the data acquisition instrument through a hole of the wire plug, and then a silica gel sealing gasket and glass cement are adopted to seal the wire plug, so that the tightness of the interior of the test barrel 5 is ensured; the data acquisition instrument is an existing conventional device and will not be described in detail herein.
In the embodiment, the test barrel 5 is placed on the fixed base plate 6, and the fixed base plate 6 is fixedly connected with the support base 10 through the high-strength bolts, so that the safety and stability of the test barrel 5 in the loading process are ensured; the support assembly comprises a beam support 7 at the upper part, a longitudinal support 9 and a support base 10, which are all made of steel plates; the whole supporting structure adopts a counterforce frame form, the height is 1.50m, the width is 1.20m, and the thickness of the steel plate is 3mm; in order to improve the bearing performance of the whole structure, a plurality of reinforcing rib plates 8 are arranged at the joint of the beam support 7 and the longitudinal support piece 9.
The invention discloses specific manufacturing steps:
referring to fig. 2, a support assembly is fabricated: a steel plate with the thickness of 3mm is selected to respectively manufacture a cross beam support 7 and a longitudinal support piece 9, the whole structure is in a reaction frame structure, the height of the whole structure is 1.50m, the width of the whole structure is 1.20m, and the specific structure is shown in fig. 2; the beam support 7 is fixedly connected with the longitudinal support piece 9 through welding, and four reinforcing rib plates 8 are additionally arranged at the joint, so that the bearing performance of the whole support structure is improved; the beam support 7 is fixedly connected with a pressure steel plate 11 of the hydraulic device through a high-strength bolt; the supporting base 10 is of a box-shaped structure, the length is 1.00m, the width is 1.20m, the height is 8.00cm, and the top of the supporting base 10 is fixedly connected with the fixed base plate 6 through high-strength bolts, so that the safety and stability of the test barrel 5 in the loading process are ensured.
The invention also provides a method for measuring the setting time of concrete under high pressure, which comprises the following steps:
s1, embedding a strain sensor: firstly, arranging a reinforcement cage in the inside of a test barrel in advance along the longitudinal direction and the radial direction, and then respectively embedding vibrating wire type strain sensors at the bottom, the middle and the upper part of the test barrel; then leading out a connecting wire of the strain sensor through a wire plug to be connected to a data acquisition instrument, and adopting a silica gel sealing gasket and glass cement to further seal the wire plug so as to ensure the tightness of the inside of the test mold box;
s2, pouring a concrete sample: coating a concrete release agent on the inside of the test barrel 5 and the surface of the loading plate 2-3 days before the test to ensure that the concrete can be smoothly released after hardening; slowly and uniformly introducing the mixed concrete mixture into a test mold bucket 5, pouring the concrete mixture to a height of 50cm, and trowelling the surface of a concrete sample after pouring is completed; in order to simulate the real pouring conditions of the site, the vibration operation is not carried out on the real pouring conditions;
s3, load is applied: the hydraulic loading system is controlled, and the oil pressure in the hydraulic oil cylinder 1 is regulated, so that the axial piston push rod 3 drives the loading plate 4 to slowly descend at a constant speed, and the loading plate 4 is pushed to be in close contact with the concrete sample; simultaneously, the pressure sensor 12 monitors the magnitude of the axial loading pressure in real time until the specified pressure load is reached; then, adjusting a hydraulic loading control system, keeping the load continuously and constantly applied, and ensuring that the concrete sample is coagulated and hardened in a closed high-pressure state;
s4, analyzing a hydration and coagulation process: the influence of high-pressure load on the hydration and coagulation process of concrete is quantitatively analyzed by monitoring the measured value change of the strain sensor in the test process, the influence mechanism of high pressure on the hydration and coagulation of concrete is explained, the initial setting time and final setting time of concrete in a high-pressure environment are determined, and technical guidance is provided for site construction.
The working principle of the invention is as follows: according to the invention, high-pressure load is applied to the concrete through the hydraulic cylinder and the axial loading device, the whole loading process can be set to be uniform-speed pressurization initially, and when the applied pressure reaches a preset value, the load is kept to be constantly applied through the control system, so that the concrete is ensured to be coagulated and hardened in a closed high-pressure state; the test barrel 5, the loading plate 4 and the rubber water stop bars are enclosed to form a sealed concrete curing chamber, and the real-time dynamic analysis of the hydration and the coagulation of the concrete under high pressure is realized by continuously monitoring the stress change in the concrete, so that the initial coagulation time and the final coagulation time of the concrete under high pressure are determined, and reliable technical and theoretical guidance is provided for on-site construction and pouring.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The test device for measuring the concrete setting time under high pressure is characterized by comprising a test barrel, a hydraulic loading system, a strain sensor and a supporting component;
the test barrel is a semi-sealed steel barrel with an opening at the top and is used for pouring concrete in the test process;
the hydraulic loading system is used for applying high-pressure load to the concrete in the test barrel;
the number of the strain sensors is a plurality, and the strain sensors are arranged in the test barrel;
the support assembly is used for supporting the test barrel and the hydraulic loading system.
2. The test device for determining the setting time of concrete under high pressure according to claim 1, wherein the hydraulic loading system comprises a hydraulic cylinder, a pressure sensor, an axial piston push rod and a loading plate which are sequentially connected from top to bottom, and the loading plate is positioned above the opening of the test barrel.
3. The test device for measuring the setting time of concrete under high pressure according to claim 2, wherein the loading plate is of a disc steel plate structure, and the diameter of the loading plate is equal to the opening diameter of the test barrel; the edge of the loading plate is provided with a circle of rubber water stop strips.
4. A test device for determining the setting time of concrete under high pressure as claimed in claim 2, wherein said support assembly comprises a support base, a longitudinal support and a cross beam support;
the support base is positioned below the test barrel;
the number of the longitudinal supporting pieces is two, and the two longitudinal supporting pieces are vertically arranged on two sides of the supporting base relatively;
the cross beam supports are horizontally arranged, and two ends of the cross beam supports are respectively and fixedly connected to the tops of the two longitudinal supporting pieces.
5. A test device for determining the setting time of concrete under high pressure as defined in claim 4 wherein a plurality of reinforcing ribs are provided between said cross beam support and two of said longitudinal supports.
6. The test device for measuring the setting time of concrete under high pressure according to claim 4, wherein the hydraulic cylinder is connected to the middle part of the beam support through a pressure steel plate.
7. The apparatus according to claim 6, further comprising a plurality of guide rods vertically disposed around the axial piston rod, wherein the plurality of guide rods are fixedly connected to the upper surface of the loading plate at one end and slidably connected to the pressure steel plate at the other end thereof through the pressure steel plate.
8. The test device for measuring the setting time of concrete under high pressure according to claim 4, wherein a fixed pad is arranged between the support base and the test barrel.
9. The test device for determining the setting time of concrete under high pressure according to claim 1, wherein a wire plug is arranged at the bottom of the test barrel, and the wire plug is in sealing connection with the test barrel by adopting a silica gel sealing pad and glass cement.
10. A method for determining the setting time of concrete under high pressure, characterized in that a test device according to any one of claims 1-9 is used, comprising the steps of:
s1, embedding a plurality of strain sensors in a test barrel; connecting wires of the strain sensors are led out through wire plugs and connected to a data acquisition instrument, and further sealing treatment is carried out on the wire plugs by adopting a silica gel sealing gasket and glass cement;
s2, pouring a concrete sample;
s3, controlling a hydraulic loading system to apply load to the concrete sample;
s4, analyzing the hydration and coagulation process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311649150.0A CN117538248A (en) | 2023-12-05 | 2023-12-05 | Test device and method for measuring concrete setting time under high pressure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311649150.0A CN117538248A (en) | 2023-12-05 | 2023-12-05 | Test device and method for measuring concrete setting time under high pressure |
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| CN117538248A true CN117538248A (en) | 2024-02-09 |
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| CN202311649150.0A Pending CN117538248A (en) | 2023-12-05 | 2023-12-05 | Test device and method for measuring concrete setting time under high pressure |
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| Country | Link |
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| CN (1) | CN117538248A (en) |
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- 2023-12-05 CN CN202311649150.0A patent/CN117538248A/en active Pending
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