CN109458925B - Dynamic deformation testing method for cement-based material in thermal curing process - Google Patents
Dynamic deformation testing method for cement-based material in thermal curing process Download PDFInfo
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Abstract
The invention relates to a dynamic deformation testing method of a cement-based material in a thermal curing process, belonging to the technical field of civil engineering material testing; the testing device comprises a controllable water bath heating system, a design mould system, a deformation measurement system, an optimized data acquisition and analysis processing program and the like. The test method comprises the following steps: 1) installing a controllable water bath heating system and setting temperature rise parameters; 2) installing and designing a mould system, and pouring and vibrating the cement-based material to be tested in the mould; 3) installing a deformation measuring system, connecting a sensor with the measuring system, and calibrating the sensor; 4) simultaneously, data acquisition is carried out; 5) and (4) analyzing the deformation condition of the cement-based material in real time through a data analysis processing program. The method realizes the automatic acquisition and data analysis of the deformation of the cement-based material under the early thermal curing condition, and is suitable for analyzing and presenting the deformation rule of the cement-based material in the thermal curing unstable process.
Description
Technical Field
The invention relates to a dynamic deformation testing method of a cement-based material in a thermal curing process, belonging to the technical field of civil engineering material testing.
Background
Under the large background of the vigorous development of the high-speed rail construction industry in China, the aim of accelerating the turnover of molds and accelerating the construction progress is to provide prefabricated parts represented by steam curing concrete, such as sleepers, track plates, prestressed simply-supported box girders and the like, and the progress of the high-speed rail construction industry is greatly promoted through the rapid and batch production of the prefabricated parts. However, even under the conditions of continuous perfect design of the mixing ratio of the steam curing concrete, improved selection of the compatibility of the cementing materials, continuous optimization of the steam curing system and the addition of various high-performance additives, the fresh concrete still has swelling deformation after undergoing the steam curing process and brings heat damage diseases such as thermal embrittlement, coarsening of a pore structure and the like, and the diseases often cause potential huge threats to the mechanical and durability of the prefabricated part and the concrete structure thereof. In this regard, steam cured concrete is required to suppress swelling and deformation, and it is desired to repair these defects by various means so that the prefabricated parts can be optimally used. Therefore, the study on the deformation characteristics of concrete in the steam curing process is an important part in the high-speed rail construction industry in China.
Currently, studies on concrete volume deformation mainly include drying shrinkage, self-shrinkage, chemical shrinkage of concrete at normal temperature and characteristics of concrete expansion and contraction at specific (high) temperature, and are mainly achieved by contact and non-contact methods, however, these studies mainly aim at concrete after setting and hardening, and there is a new method for specifically introducing concrete deformation characteristics test during steam curing, i.e. during the transition from normal temperature to high temperature. A few scholars study the deformation characteristics of concrete in the steam curing process in a mode of erecting a magnetic support outside a steam curing box and overlapping a dial indicator, but errors caused by vibration and artificial reading caused by an alternating current relay switch of the steam curing box cannot be eliminated, and meanwhile, the steam rising affects the reading of the dial indicator and the dial indicator is likely to be corroded, so that the traditional contact type testing method has obvious defects in the study of the deformation characteristics of the concrete in the steam curing process.
Disclosure of Invention
The invention aims to provide a dynamic deformation testing method for cement-based materials in the thermal curing process, which is simple in structure, reasonable in design and convenient to use, aiming at the defects and shortcomings of the prior art.
In order to achieve the purpose, the invention adopts the technical scheme that: the dynamic deformation testing method of the cement-based material in the thermal curing process is completed by a testing device, wherein the testing device comprises a controllable water bath heating system, a design mould system consisting of a test mould and a reflection target, a deformation measuring system consisting of a data acquisition instrument, an eddy current sensor and an outer frame, and a cement-based material deformation testing system consisting of an optimized data acquisition and analysis processing program installed in a computer.
Preferably, the controllable water bath heating system is rectangular, the box body is of a double-layer heat insulation structure and is made of 304 stainless steel, the heating liquid in the controllable water bath heating system is tap water, the temperature control range is 20-100 ℃, the temperature control precision is +/-2 ℃, and the temperature rise rate is controllable at 0-20 ℃/h; a plurality of die testing grooves are reserved in the cuboid.
Preferably, after the plurality of test molds are installed in a matched manner with the mold testing grooves, the liquid level of the heating liquid rises to the top surfaces of the side walls of the test molds.
Preferably, the test mold and the reflective target are made of invar steel and have a thermal expansion coefficient of 1.5 × 10-6/° c, the modulus of elasticity is 145 GPa.
Preferably, the thickness of the bottom plate and the side wall of the test mould is about 5mm, the length and the width of the bottom plate are about 530mm and about 100mm respectively, the short side wall is vertically welded on the short side of the bottom plate and has the height of about 100mm, the long side wall is welded on the long side of the bottom plate and inclines outwards, the gradient and the vertical height are about 2.5 percent and about 100mm respectively, the distance between the top ends of the long side walls is about 105mm, and cement-based materials are poured and vibrated in the test mould;
preferably, the thickness of the base and the reflecting surface of the reflecting target is about 5mm, the base is square with the side length of about 50mm, the reflecting surface is vertically welded on the central line of the side length of the base, the height and the width of the reflecting surface are about 160mm and about 30mm respectively, and the back surface of the base is pasted with a polytetrafluoroethylene foam board with the equal area and the thickness of 2.5-3.5 mm.
Preferably, the cement-based material comprises cement paste, cement mortar and cement concrete.
Preferably, the outer frame of the deformation measurement system is an aluminum alloy frame, the cross sections of beams and columns of the deformation measurement system are squares with side lengths of about 30mm, the aluminum alloy frame crosses the controllable water bath heating system and is fixed on the ground through bolts, the aluminum alloy frame is provided with a plurality of main beams which respectively correspond to a plurality of die test grooves, short columns with the length of about 60mm are welded at the lower parts of the two ends of each main beam, and holes with the diameter of about 10mm are reserved at the lower parts of the short columns; the eddy current sensor penetrates through a reserved hole of a short column at the lower part of the main beam in the short side direction of the test mould, the position of the eddy current sensor is adjusted through two nuts at the front and the rear of the short column, and the eddy current sensor is connected with a data acquisition instrument; the data acquisition instrument is a full-automatic data acquisition system, which is provided with three groups of six channels, can be connected with six eddy current sensors, and has the acquisition frequency of once per minute.
Preferably, the computer analyzes the data acquired by the data acquisition instrument in real time through the compiled analysis processing program, sets a temperature strain value corresponding to the temperature change of the cement-based material, and feeds back the deformation characteristic of the cement-based material in real time, and the computer deducts the temperature strain value from the real-time strain value to obtain a near-real deformation value of the cement-based material, so as to feed back the deformation characteristic of the cement-based material in real time.
The deformation dynamic testing method of the cement-based material in the thermal curing process mainly comprises the following steps:
01. installing a controllable water bath heating system, wherein a plurality of die test grooves are reserved in the controllable water bath heating system; setting test parameters: adding a proper amount of tap water, turning on a power switch, setting the water bath temperature to be 20 ℃, and setting the heating rate to be 0 ℃/h;
02. installing and designing a mould system, pouring and vibrating the cement-based material to be tested in a test mould: the method comprises the following steps that (1) an equal-height plastic plate with the thickness of about 3mm is closely attached to the long side wall of a test mould, an equal-height polytetrafluoroethylene foam plate with the thickness of about 5mm is closely attached to the short side wall of the test mould, a polytetrafluoroethylene film is flatly laid on a bottom plate and the long side wall of the test mould, and a small amount of lubricating oil is uniformly coated in the polytetrafluoroethylene film; placing the reflecting targets at two ends in a test mould, and keeping the reflecting targets vertical to the probe of the eddy current sensor to ensure that the distance between the reflecting targets is more than 400 mm; pouring the mixed cement-based material into a test mould in two layers, controlling the height of the cement-based material to be about 85mm, and vibrating the test mould on a concrete vibrating table for 30s after each layer is poured; after the vibration is finished, covering a layer of plastic film on the cement-based material, and then covering a layer of polytetrafluoroethylene foam board with the thickness of 10 mm; installing a plurality of test molds filled with cement-based materials in a controllable water bath heating system;
03. the installation warp measurement system, connects current vortex sensor and warp measurement system's connection data acquisition appearance, carries out the sensor calibration: after the test reaches the required static stop time, removing the plastic plate and the polytetrafluoroethylene foam plate on the side wall of the test mould; the outer frame is arranged on the controllable water bath heating system in a crossing mode, the outer frame is guaranteed not to be in contact with the controllable water bath heating system, and the plurality of main beams are located on the central axes of the plurality of die testing grooves; connecting the eddy current sensor with a data acquisition instrument, installing the eddy current sensor on a short column of an outer frame main beam in a hanging manner, adjusting the position of the eddy current sensor through a nut, and calibrating and ensuring the distance to be about 1.2mm through the real-time distance between a reflection target and the corresponding eddy current sensor displayed by a computer;
04. adopt controllable formula water-bath heating system simulation heat maintenance process, carry out data acquisition simultaneously: adjusting the temperature rising rate of the controllable water bath heating system to meet the requirement required by the test, and setting the duration time for keeping the constant temperature; opening a data acquisition instrument to automatically acquire deformation data of the cement-based material when the temperature rises;
05. the deformation condition of the cement-based material (4) is analyzed in real time through an edited data analysis processing program, wherein the real-time deformation value of the cement-based material can be determined by α ═ △ l1+△l2)×106/L0Calculated (wherein: △ l)1、△l2The difference between the real-time interval and the initial interval L of the reflecting targets corresponding to the two probes of 1 group of eddy current sensors respectively0To test the initial separation between the first two reflective targets).
The invention adopts a non-contact technical means to dynamically monitor the deformation condition of the cement-based material so as to eliminate the influence of steam and temperature on the test, and simultaneously, realizes the automatic acquisition and analysis of volume deformation data of the cement-based material under the unsteady conditions of early thermal curing and the like and feeds back the test result in real time.
After adopting the structure, the invention has the beneficial effects that: the method for dynamically testing the deformation of the cement-based material in the thermal curing process realizes the automatic acquisition and data analysis of the deformation of the cement-based material under the unstable conditions such as early thermal curing and the like, is suitable for analyzing and presenting the deformation rule of the cement-based material in the thermal curing process, and particularly can provide reference for the compatibility of steam-cured concrete and the optimization of the curing system of the steam-cured concrete; the invention can eliminate the influence of steam and temperature on the test, dynamically monitor the deformation condition of the cement-based material by adopting a non-contact test means, realize the automatic acquisition and data analysis of the deformation of the cement-based material under the condition of early thermal curing, feed back the test result in real time, and realize the accurate, reliable, continuous and automatic dynamic test process through simple and convenient operation.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic diagram of a deformation dynamic test apparatus of the present invention;
FIG. 2 is a schematic diagram of a test mold of the present invention;
FIG. 3 is a right side view of this FIG. 2;
FIG. 4 is a schematic view of a reflective target construction of the present invention;
FIG. 5 is a right side view of FIG. 4;
FIG. 6 is a deformation dynamic test schematic of the present invention;
FIG. 7 is a deformation dynamic test result of the present invention;
description of reference numerals:
1-controllable water bath heating system; 2-testing the mould; 3-a reflective target; 4-a cement-based material; 5-a data acquisition instrument; 6-an eddy current sensor; 7-external frame; 8-a computer.
Detailed Description
The invention will be further described with reference to the accompanying drawings.
Referring to fig. 1 to 5, a dynamic deformation testing method for cement-based materials during thermal curing process according to the present embodiment is completed by a testing apparatus, where the testing apparatus includes a controllable water bath heating system 1, a design mold system, an improved non-contact deformation measurement system, and an optimized data acquisition and analysis processing program. The controllable water bath heating system 1 is composed of a rectangular box body made of 304 stainless steel, a double-layer heat preservation structure of the rectangular box body, a heating liquid and a temperature control program, wherein the temperature control range is 20-100 ℃, the temperature control precision is +/-2 ℃, and the temperature rise rate is 0-20 ℃/h; three test mold grooves are reserved, and when the three test molds are completely installed, the liquid level of the heated liquid rises to the top surface of the side wall of each test mold; designing a mould system, which consists of a test mould 2 made of invar steel and a reflection target 3, wherein the thicknesses of a bottom plate and a side wall of the test mould 2 are 5mm, the length and the width of the bottom plate are 530mm and 100mm respectively, the short side wall is vertically welded on the short side of the bottom plate and has the height of 100mm, the long side wall is welded on the long side of the bottom plate and inclines outwards, the gradient and the vertical height are 2.5 percent and 100mm respectively, and the distance between the top ends of the long side walls is 105 mm; the thickness of a base and a reflecting surface of the reflecting target 3 is 5mm, the base is a square with the side length of 50mm, the reflecting surface is vertically welded on the central line of the side length of the base, the height and the width of the reflecting surface are respectively 160mm and 30mm, and 1 polytetrafluoroethylene foam board with the equal area and the thickness of 3mm is pasted on the back surface of the base; the deformation measuring system comprises an aluminum alloy outer frame 7, an eddy current sensor 6 and a data acquisition instrument 5, wherein the outer frame 7 spans the controllable water bath heating system 1 and is fixed on the ground through bolts, three main beams of the outer frame respectively correspond to three test mold grooves, and the eddy current sensor 6 penetrates through a reserved hole of a short column at the lower part of the main beam towards the short side direction of the test mold 2 and is connected with the data acquisition instrument 5; the data acquisition instrument 5 is a full-automatic data acquisition system, and the acquisition frequency is once per minute; the compiled analysis processing program can analyze the data acquired by the data acquisition instrument 5 in real time, can set a temperature strain value corresponding to the temperature change of the cement-based material 4, and can feed back the deformation characteristics of the cement-based material 4 in real time.
A deformation dynamic test method of a cement-based material in a thermal curing process mainly comprises the following steps:
1. preparing a test mold: in the test mould 2, a plastic plate with the same height and the thickness of 3mm is closely attached to the long inner wall of the test mould 2, a polytetrafluoroethylene foam plate with the same height and the thickness of 5mm is closely attached to the short inner wall of the test mould 2, a polytetrafluoroethylene film is closely laid on the inner wall and the bottom plate of the test mould 2, and a layer of lubricating oil is uniformly coated in the test mould 2; placing the reflecting target 3 on a bottom plate of the test mould 2 and ensuring that a reflecting surface is vertical to the long edge of the test mould 2; the distance between the reflecting targets 3 is not less than 400 mm;
2. preparation of a test piece: in this embodiment, concrete is used as the cement-based material 4; adding the weighed concrete raw materials including cement, mineral admixture and sand stone into a forced concrete mixer, pouring the weighed water and admixture after dry mixing for 2min, continuing wet mixing for 2min, stopping stirring, and pouring out fresh concrete for later use; firstly, pouring a small amount of concrete on the front surface and the back surface of the reflecting target 3, further compacting and fixing the reflecting target, pouring the concrete into the test mould 2 in two layers, and immediately placing the test mould 2 on a concrete vibrating table for vibrating for 30s after the first layer of concrete is poured; because the test mould 2 is too long and the reflecting target 3 blocks the concrete, and meanwhile, in order to avoid over-vibration, after the 2 nd layer of concrete is poured, a small amount of concrete needs to be poured on the back surface of the reflecting target 3, and the test mould is continuously vibrated for 30s, so that the concrete on the front surface and the back surface of the reflecting target 3 are equal in height, the whole concrete test piece is uniform and compact, and the height of the whole concrete test piece is controlled to be 85 mm;
3. and (3) heat preservation and heat insulation of the test piece: covering a layer of plastic film on the surface of the concrete sample and exposing the reflecting target 3, wherein the layer of plastic film is required to cover the concrete between the back of the reflecting target 3 and the end part of the test mould 2 and between the two reflecting targets 3, and ensuring that the contact part of the reflecting surface and the concrete is tightly covered by the plastic film; meanwhile, a layer of polytetrafluoroethylene foam board with the thickness of 10mm is pressed above the plastic film for heat preservation and insulation, so that the temperature exchange between the concrete and the test environment is reduced, and the drying shrinkage of the concrete is reduced;
4. test preparation: adding sufficient tap water into the controllable water bath heating system 1, turning on a power switch, setting the water bath temperature to be 20 ℃, and setting the heating rate to be 0 ℃/h; meanwhile, after the test mould 2 is arranged in the controllable water bath heating system 1, the rising height of the liquid level exceeds the height of the concrete test piece; after the concrete test piece reaches the static stop time required by the test, removing the plastic plate and the polytetrafluoroethylene foam plate in the test mould 2, and reserving enough concrete deformation space;
5. and (3) probe calibration: finely adjusting the positions of the eddy current sensors 6 and fixing the eddy current sensors by nuts so that the distance between each eddy current sensor 6 and the corresponding reflection target 3 is kept at 1.2 mm;
6. temperature control: setting the heating rate of the controllable water bath heating system 1 at 20 ℃/h, and simultaneously setting the temperature of the controllable water bath heating system 1 to be kept at a constant temperature state for 8h when the water temperature reaches 60 ℃;
7. program setting: the method comprises the steps that the collection frequency of a data collector 5 is set to be once per minute on a computer 8 provided with an edited data processing program, and meanwhile, the temperature strain value corresponding to the rise of concrete at the temperature of 1 ℃ is set to be 9 microstrain in the program;
8. and (3) analyzing the data, namely obtaining the real-time deformation value α of the concrete sample (△ l) according to the deformation dynamic test principle diagram shown in fig. 6 by the computer 8 provided with the edited data processing program1+△l2)×106/L0The approximate real value of the deformation of the concrete is that at the temperature, the real-time deformation value of the concrete subtracts a corresponding temperature strain value β, and the finally presented deformation result is α0＝α-β；
9. Deformation curve: fig. 7 shows the deformation results of the concrete sample of this example during thermal curing, at which the thermal expansion deformation of the concrete sample rapidly increases within the first 2h and exceeds 1700 microstrains at most, while the deformation of the concrete sample shows a tendency to gradually shrink in the constant temperature stage of 8 h.
The above description is only for the purpose of illustrating the technical solutions of the present invention and not for the purpose of limiting the same, and other modifications or equivalent substitutions made by those skilled in the art to the technical solutions of the present invention should be covered within the scope of the claims of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (9)
1. The dynamic deformation testing method of the cement-based material in the thermal curing process is characterized in that: the dynamic deformation testing method of the cement-based material in the thermal curing process is completed by a testing device, wherein the testing device comprises a controllable water bath heating system (1), a design mould system consisting of a test mould (2) and a reflection target (3), a deformation measuring system consisting of a data acquisition instrument (5), an eddy current sensor (6) and an outer frame (7) and a cement-based material deformation testing system consisting of an optimized data acquisition and analysis processing program arranged in a computer (8);
the deformation dynamic testing method of the cement-based material in the thermal curing process mainly comprises the following steps:
(01) installing a controllable water bath heating system (1), wherein a plurality of die test grooves are reserved in the controllable water bath heating system (1); setting test parameters, adding a proper amount of tap water, turning on a power switch, setting the water bath temperature to be 20 ℃, and setting the heating rate to be 0 ℃/h;
(02) installation design mould system pours and vibrates cement-based material (4) that will await measuring in experimental mould (2): the long side wall of the test mould (2) is closely attached with an equal-height plastic plate with the thickness of about 3mm, the short side wall of the test mould is closely attached with an equal-height polytetrafluoroethylene foam plate with the thickness of about 5mm, a layer of polytetrafluoroethylene film is flatly laid on the bottom plate and the long side wall of the test mould, and a small amount of lubricating oil is uniformly coated in the polytetrafluoroethylene film; placing the reflecting targets (3) at two ends in the test mould (2) and keeping the reflecting targets perpendicular to the probe of the eddy current sensor (6) to ensure that the distance between the reflecting targets (3) is more than 400 mm; pouring the mixed cement-based material (4) into the test mould (2) in two layers, controlling the height of the cement-based material (4) to be about 85mm, and vibrating the test mould (2) on a concrete vibrating table for 30s after each layer is poured; after the vibration is finished, covering a layer of plastic film on the cement-based material (4), and then covering a layer of polytetrafluoroethylene foam board with the thickness of 10 mm; a plurality of test molds (2) filled with cement-based materials (4) are arranged in a controllable water bath heating system (1);
(03) the installation is out of shape measurement system, connects eddy current sensor and this and is out of shape measurement system's connection data acquisition appearance (5), carries out the calibration of eddy current sensor: after the test reaches the required rest time, removing the plastic plate and the polytetrafluoroethylene foam plate on the side wall of the test mould (2); the outer frame (7) is arranged on the controllable water bath heating system (1) in a crossing mode, so that the outer frame is not in contact with the controllable water bath heating system (1), and a plurality of main beams are positioned on the central axes of a plurality of die testing grooves; connecting the eddy current sensor (6) with a data acquisition instrument (5), installing the data acquisition instrument on a short column of a main beam of an outer frame (7) in a hanging manner, adjusting the position of the data acquisition instrument through a nut, and calibrating and ensuring the distance to be about 1.2mm through the real-time distance between a reflection target (3) and the corresponding eddy current sensor (6) displayed by a computer (8);
(04) adopt controllable formula water-bath heating system (1) simulation heat curing process, carry out data acquisition simultaneously: adjusting the temperature rising rate of the controllable water bath heating system (1) to meet the requirement required by the test, and setting the duration time for keeping the constant temperature; opening the data acquisition instrument (5) to automatically acquire deformation data of the cement-based material (4) when the temperature rises;
(05) and analyzing the deformation condition of the cement-based material (4) in real time through an edited data analysis processing program, wherein the real-time deformation value of the cement-based material can be determined by α ═ △ l1+△l2)×106/L0Calculated, wherein △ l1、△l2The difference between the real-time interval and the initial interval L of the reflecting targets corresponding to the two probes of 1 group of eddy current sensors respectively0To test the initial separation between the first two reflective targets.
2. The method for dynamically testing the deformation of a cement-based material during thermal curing according to claim 1, wherein: the controllable water bath heating system (1) is cuboid, the box body is of a double-layer heat insulation structure and is made of 304 stainless steel, the heating liquid in the controllable water bath heating system (1) is tap water, the temperature control range is 20-100 ℃, the temperature control precision is +/-2 ℃, and the temperature rise rate can be controlled at 0-20 ℃/h; a plurality of die testing grooves are reserved in the cuboid.
3. The method for dynamically testing the deformation of a cement-based material during thermal curing according to claim 1, wherein: and after the test molds (2) are matched with the test mold grooves, the liquid level of the heated liquid rises to the top surfaces of the side walls of the test molds (2).
4. The method for dynamically testing the deformation of cement-based materials during thermal curing of cement-based materials according to claim 1, wherein the test mold (2) and the reflective target (3) are made of invar with a coefficient of thermal expansion of 1.5 × 10-6/° c, the modulus of elasticity is 145 GPa.
5. The method for dynamically testing the deformation of a cement-based material during thermal curing according to claim 1, wherein: the thickness of the bottom plate and the side wall of the test mould (2) is about 5mm, the length and the width of the bottom plate are about 530mm and about 100mm respectively, the short side wall is vertically welded on the short side of the bottom plate and is about 100mm in height, the long side wall is welded on the long side of the bottom plate and inclines outwards, the gradient and the vertical height are about 2.5 percent and 100mm respectively, and the distance between the top ends of the long side walls is about 105 mm.
6. The method for dynamically testing the deformation of a cement-based material during thermal curing according to claim 5, wherein: the thickness of the base and the reflecting surface of the reflecting target (3) is about 5mm, the base is square with the side length of about 50mm, the reflecting surface is vertically welded on the central line of the side length of the base, the height and the width of the reflecting surface are about 160mm and about 30mm respectively, and the back surface of the base is pasted with a polytetrafluoroethylene foam board with the equal area and the thickness of 2.5-3.5 mm.
7. The method for dynamically testing the deformation of a cement-based material during thermal curing according to claim 5, wherein: the cement-based material (4) comprises cement paste, cement mortar and cement concrete.
8. The method for dynamically testing the deformation of a cement-based material during thermal curing according to claim 1, wherein: the deformation measurement system is characterized in that an outer frame (7) is an aluminum alloy frame, the cross sections of beams and columns of the deformation measurement system are squares with side lengths of about 30mm, the outer frame crosses a controllable water bath heating system (1) and is fixed on the ground through bolts, the deformation measurement system is provided with a plurality of main beams which respectively correspond to a plurality of die test grooves, short columns with the length of about 60mm are welded at the lower parts of the two ends of each main beam, and holes with the diameter of about 10mm are reserved at the lower parts of the short columns; the eddy current sensor (6) penetrates through a reserved hole of a short column at the lower part of the main beam towards the short side direction of the test mould (2), the position of the eddy current sensor is adjusted through a front nut and a rear nut of the short column, and the eddy current sensor is connected with the data acquisition instrument (5); the data acquisition instrument (5) is a full-automatic data acquisition system, is provided with three groups of six channels, can be connected with six eddy current sensors (6), and has the acquisition frequency of once per minute.
9. The method for dynamically testing the deformation of a cement-based material during thermal curing according to claim 1, wherein: the computer (8) analyzes the data acquired by the data acquisition instrument (5) in real time through the compiled analysis processing program, sets a temperature strain value corresponding to the temperature change of the cement-based material (4), and feeds back the deformation characteristic of the cement-based material (4) in real time, and the computer (8) subtracts the temperature strain value from the real-time strain value to obtain a near-real deformation value of the cement-based material (4), so that the deformation characteristic of the cement-based material (4) is fed back in real time.
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