Method for detecting internal hardness and strength of aerated concrete blank and speed insertion rod for detection

Abstract

The invention provides a method for detecting the internal hardness and strength of an aerated concrete blank and a speed insertion rod for detection, and relates to the technical field of aerated concrete performance detection. The detection method comprises the following steps: fitting and establishing a speed insertion rod descending speed-hardness relation curve and a speed insertion rod descending speed-strength relation curve according to the average descending speed of a speed insertion rod under aerated concrete blanks with different hardness and strength; then detecting the aerated concrete blank to be detected by utilizing a speed insertion rod, and substituting speed data of the speed insertion rod at different descending heights in the blank into a relationship curve of descending speed-hardness and descending speed-strength of the speed insertion rod; the hardness and strength data of different descending height positions in the aerated concrete blank to be detected are obtained. The detection method has the advantages of being simple and high in applicability, and the hardness and strength of the aerated concrete green body at any position in the three-dimensional space can be detected by selecting the falling position of the speed insertion rod.

Description

Technical Field

[0001] The invention relates to the technical field of aerated concrete performance detection, in particular to a method for detecting the internal hardness and strength of an aerated concrete blank and a speed plunger for detection. Background Art

[0002] Aerated concrete is a lightweight, heat-insulating, fire-proof and heat-insulating building material, which is widely used in civil buildings, commercial buildings, industrial buildings, etc. In the preparation process of aerated concrete, it is usually necessary to go through processes such as pouring, static curing, cutting, and autoclaving. Among them, cutting is a key factor in ensuring the accurate size of aerated concrete. In the cutting process, the hardness of the blank directly affects the quality of the cutting effect. In the industrial production process, after the aerated concrete blank is poured, the dissolution of lime and the hydration of cement will continue to release heat during the hardening process of the blank, resulting in a large temperature difference between the inside and outside of the large-volume blank. The temperature has a direct impact on the development of the hardness and strength of the blank. The higher the temperature, the faster the blank hardens and the higher the strength. Conversely, the slower the hardening and the lower the strength.

[0003] Therefore, during the hardening process of the green body, the hardness and strength of the green body at different positions at the same time are different. Clarifying the changes in hardness and strength at different positions is important for exploring the hardening law of the green body and ensuring the quality of aerated concrete. There are also some detection devices or instruments designed for the hardness of aerated concrete in the existing technical solutions, but they all have certain defects. For example:

[0004] Patent CN211697328U discloses a blank hardness detection device, including a device body, which includes a contact part, a connecting part, a metering part and a handle. The contact part is a cone, and the two ends of the connecting part are respectively connected to the contact part and the metering part. The outer wall of the metering part is provided with a scale for indicating the hardness value, and the outer wall of the metering part is covered with a scale ring; the handle has an inner cavity, one end of which is open and the other end is closed, one end of the metering part is connected to the connecting part, and the other end is inserted into the inner cavity of the handle, and the inner cavity of the handle is provided with a spring, which is located between the inserted end of the metering part and the closed end of the handle. The device can effectively obtain the hardness of aerated concrete before cutting, and provide a reliable reference for grasping the cutting time.

[0005] Patent CN215574399U discloses a hardness tester for aerated concrete production, which relates to the technical field of aerated concrete embryo hardness testing, and aims to solve the problem that the existing hardness tester has a simple structure, is inconvenient to adjust, and has low flexibility in use. A mounting frame is installed above the base, a cylinder is installed between the rear end of the mounting frame and the base, connecting seats are provided on both sides of the mounting frame, a sliding sleeve is provided inside the connecting seat, a support rod is installed inside the sliding sleeve, and the support rod passes through the sliding sleeve and is welded to the base, a measuring cylinder is installed on the inner side of the front end of the mounting frame, clamping parts are installed on both sides of the upper end of the measuring cylinder, a measuring rod is installed on the inner side of the measuring cylinder, and positioning parts are installed on both sides of the lower end of the measuring cylinder.

[0006] However, the detection methods disclosed in the above-mentioned patents CN211697328U and CN215574399U can only detect the hardness of a certain point on the surface of the aerated concrete body, and cannot detect the internal hardness of the aerated concrete body.

[0007] For another example, patent CN116929973B discloses a device for testing the hardness of an aerated concrete blank, including a pressure balancing mechanism and a propulsion mechanism installed on the pressure balancing mechanism. A first column, a second column, a third column and a fourth column in a cone structure are movably installed inside the reinforced outer tube, and four racks of different lengths are installed on the top of the first column, the second column, the third column and the fourth column, respectively. In combination with the meshing transmission of the four gear shafts movably installed in the middle of the reinforced outer tube to the four racks, when the combined base, the deflection end and the tightening force arms expanded and clamped on both sides of the precast mold suspend the reinforced outer tube on the top of the precast mold, as the first column, the second column, the third column and the fourth column shrink layer by layer toward the inside of the reinforced outer tube, the pressure-bearing assembly pushed downward by the two main inclined plates can perform multi-faceted strength and hardness compression tests on the blank. Although patent CN116929973B can detect the hardness inside the aerated concrete body, the device has a complex structure and high cost, and it is difficult to detect large-volume industrial-grade aerated concrete bodies.

[0008] In addition, the existing patented technology is mainly aimed at designing instruments and devices for testing the hardness of aerated concrete bodies, and involves fewer testing methods. Especially for industrial-grade large-volume aerated concrete bodies, it is necessary to invent an effective method for testing the hardness and strength of aerated concrete bodies at any position in the three-dimensional space.

[0009] In view of this, the present invention is proposed. Summary of the invention

[0010] The first purpose of the present invention is to provide a method for detecting the internal hardness and strength of an aerated concrete body. The detection method detects the internal hardness and strength of an aerated concrete body by means of a fitting relationship curve. The detection method has the advantages of being simple and highly applicable. The hardness and strength of the aerated concrete body at any position in three-dimensional space can be obtained by selecting the falling position of a speed plunger, thereby providing a new idea for determining the internal hardness and strength of a large-volume aerated concrete body.

[0011] The second object of the present invention is to provide a speed plunger for detecting the internal hardness and strength of the above-mentioned aerated concrete body.

[0012] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted:

[0013] The present invention provides a method for detecting the internal hardness and strength of an aerated concrete body, the method comprising:

[0014] Based on the average descending speed of the speed plunger under different hardness and strength of aerated concrete blanks, the relationship curves of the speed plunger descending speed-hardness and the relationship curves of the speed plunger descending speed-strength are fitted and established;

[0015] The aerated concrete body to be tested is tested using a speed rod, and the speed data of the speed rod at different descending heights in the body are recorded. The speed data are substituted into the speed rod descending speed-hardness relationship curve and the speed rod descending speed-strength relationship curve to obtain the hardness and strength data at different descending heights inside the aerated concrete body to be tested.

[0016] Furthermore, the fitting method for establishing the relationship curve between the speed rod descending speed and hardness and the relationship curve between the speed rod descending speed and hardness includes:

[0017] (A) mixing and pouring aerated concrete into aerated concrete bodies of different hardness and strength;

[0018] (B) using a speed plunger to measure the average descending speed of the plunger from the surface to the bottom of the blank with different hardness, recorded as the descending speed A;

[0019] The descending speed A of the plunger measured at each hardness is taken as the horizontal coordinate, and the hardness of the blank is taken as the vertical coordinate, and a descending speed-hardness relationship curve is established;

[0020] (C) using a speed plunger to measure the average descending speed of the plunger from the surface to the bottom of the blank with different strengths, recorded as the descending speed B;

[0021] The descending speed B of the plunger measured at each hardness is taken as the horizontal coordinate, and the strength of the blank is taken as the vertical coordinate, so as to establish a descending speed-strength relationship curve.

[0022] Furthermore, in step (A), aerated concrete bodies of different hardness and strength are prepared by body curing.

[0023] The green body curing time is 20 to 240 minutes.

[0024] Furthermore, the temperature of the green body curing is 45-60° C. and the humidity is 80-100%.

[0025] Furthermore, the detection method also includes the step of obtaining a hardness and strength variation curve of the aerated concrete body to be tested by using the hardness and strength data at different descending height positions inside the aerated concrete body to be tested.

[0026] The speed plunger for detection provided by the present invention comprises: a long rectangular channel steel, a concave bearing, a steel plunger and a plunger speed monitoring device;

[0027] The concave bearing comprises a first outer ring groove bearing and a second outer ring groove bearing, wherein the first outer ring groove bearing and the second outer ring groove bearing can be slidably arranged in the long rectangular channel steel, and the axial direction of the bearing is perpendicular to the long surface of the long rectangular channel steel;

[0028] The first outer ring groove bearing and the second outer ring groove bearing are arranged adjacent to each other, and the adjacent grooves of the two bearings form a cylindrical hole, and the steel plug rod is inserted from the cylindrical hole, and the diameter of the steel plug rod is the same as the diameter of the cylindrical hole;

[0029] The rod insertion speed monitoring device is arranged on the long rectangular channel steel and is used to monitor the descending speed of the steel rod insertion.

[0030] Furthermore, the rod insertion speed monitoring device is an electrical laser speed monitor.

[0031] Furthermore, the surface of the steel rod is coated with a fluorocarbon coating.

[0032] Furthermore, the long rectangular channel steel is provided with a fixing slot for fixing the aerated concrete body to be tested.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] The present invention provides a method for detecting the internal hardness and strength of an aerated concrete body. The detection method is based on the average descending speed of the speed rod under different hardness and strength aerated concrete bodies, and fits and establishes a relationship curve between the descending speed of the speed rod and the hardness and a relationship curve between the descending speed of the speed rod and the strength; then the speed rod is used to detect the aerated concrete body to be tested, and the speed data of the speed rod at different descending heights in the body are recorded, and then the speed data is brought into the relationship curve between the descending speed of the speed rod and the hardness and the relationship curve between the descending speed of the speed rod and the strength, and the hardness and strength data of different descending height positions inside the aerated concrete body to be tested are obtained. The above detection method of the present invention detects the internal hardness and strength of the aerated concrete body by fitting the relationship curve, and has the advantages of simple detection method and strong applicability, and the hardness and strength of the aerated concrete body at any position in three-dimensional space can be obtained by selecting the falling position of the speed rod, thereby providing a new idea for the determination of the internal hardness and strength of large-volume aerated concrete bodies.

[0035] The speed plunger provided by the present invention comprises: a long rectangular channel steel, a concave bearing, a steel plunger and a plunger speed monitoring device; wherein: the concave bearing comprises a first outer ring groove bearing and a second outer ring groove bearing, the first outer ring groove bearing and the second outer ring groove bearing can be slidably arranged in the long rectangular channel steel and are arranged adjacently, the adjacent grooves of the two bearings form a cylindrical hole, the steel plunger is inserted from the cylindrical hole, and the diameter of the steel plunger is the same as the diameter of the cylindrical hole. The above-mentioned speed plunger controls the falling position of the steel plunger through the cylindrical hole formed by the first outer ring groove bearing and the second outer ring groove bearing, and at the same time, during the falling process of the steel plunger, the plunger speed monitoring device is used to detect the falling speed of the steel plunger, and then the falling speed of the steel plunger is monitored. Therefore, the above-mentioned speed plunger of the present application can realize the monitoring of the falling speed of the steel plunger at different positions of the aerated concrete blank according to the adjustment of the falling position of the steel plunger. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A schematic front view of the structure of a speed plug for detection provided in Example 1 of the present invention;

[0038] Figure 2 A schematic top view of the structure of a speed plug for detection provided in Example 1 of the present invention;

[0039] Figure 3 This is a schematic diagram of the long rectangular channel steel structure of the speed plug rod for detection provided in Example 1 of the present invention.

[0040] Icons: 1-long rectangular channel steel; 2-concave bearing; 21-first outer ring groove bearing; 22-second outer ring groove bearing; 3-insertion rod speed monitoring device; 31-electric laser speed monitor; 4-fixed slot; 5-steel insertion rod; 6-fluorocarbon coating. DETAILED DESCRIPTION

[0041] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] According to one aspect of the present invention, a method for detecting the internal hardness and strength of an aerated concrete body comprises:

[0043] Based on the average descending speed of the speed plunger under different hardness and strength of aerated concrete blanks, the relationship curves of the speed plunger descending speed-hardness and the relationship curves of the speed plunger descending speed-strength are fitted and established;

[0044] The aerated concrete body to be tested is tested using a speed rod, and the speed data of the speed rod at different descending heights in the body are recorded. The speed data are substituted into the speed rod descending speed-hardness relationship curve and the speed rod descending speed-strength relationship curve to obtain the hardness and strength data at different descending heights inside the aerated concrete body to be tested.

[0045] The present invention provides a method for detecting the internal hardness and strength of an aerated concrete body. The detection method is based on the average descending speed of the speed rod under different hardness and strength aerated concrete bodies, and fits and establishes a relationship curve between the descending speed of the speed rod and the hardness and a relationship curve between the descending speed of the speed rod and the strength; then the speed rod is used to detect the aerated concrete body to be tested, and the speed data of the speed rod at different descending heights in the body are recorded, and then the speed data is brought into the relationship curve between the descending speed of the speed rod and the hardness and the relationship curve between the descending speed of the speed rod and the strength, and the hardness and strength data of different descending height positions inside the aerated concrete body to be tested are obtained. The above detection method of the present invention detects the internal hardness and strength of the aerated concrete body by fitting the relationship curve, and has the advantages of simple detection method and strong applicability, and the hardness and strength of the aerated concrete body at any position in three-dimensional space can be obtained by selecting the falling position of the speed rod, thereby providing a new idea for the determination of the internal hardness and strength of large-volume aerated concrete bodies.

[0046] In a preferred embodiment of the present invention, the fitting method for establishing the relationship curve between the speed plunger descent speed and hardness and the relationship curve between the speed plunger descent speed and strength comprises:

[0047] (A) mixing and pouring aerated concrete, and preparing aerated concrete bodies of different hardness and strength by body curing;

[0048] In the above preferred embodiment, the aerated concrete mixing and pouring refers to:

[0049] After mixing the aerated concrete according to the proportion, inject it into 50cm×50cm×60cm and several 10cm×10cm×10cm molds respectively. In the 50cm×50cm×60cm mold, the gas height of the aerated concrete after gasification is completed is controlled to be 5-8cm by adjusting the slurry amount. In the 10cm×10cm×10cm mold, the gas height of the aerated concrete after gasification is completed is controlled to be 10cm by adjusting the slurry amount.

[0050] In the above preferred embodiment, the green body curing refers to:

[0051] The green body after gasification and the mold are placed in an environment with a temperature of 45-60°C and a humidity of 80-100% for curing. By extending the curing time, the green body has different hardness and strength.

[0052] (B) using a speed plunger to measure the average descending speed of the plunger from the surface to the bottom of the blank with different hardness, recorded as the descending speed A; using the plunger descending speed A measured by the speed plunger at each hardness as the abscissa and the hardness of the blank as the ordinate, a descending speed-hardness relationship curve is established;

[0053] (C) Use a speed rod to measure the average descent speed of the rod from the surface to the bottom of the blank with different strengths, recorded as the descent speed B; use the descent speed B of the rod measured by the speed rod at each hardness as the horizontal axis and the strength of the blank as the vertical axis to establish a descent speed-strength relationship curve.

[0054] In the above preferred embodiment, the method for establishing the above falling speed-hardness relationship curve and the falling speed-strength relationship curve includes: data measurement and curve establishment.

[0055] The data measurement refers to the data measurement of the blanks with different hardness and strength obtained in step (A), that is, when the hardness of the blanks is 90-110HV, 190-210HV, 290-310HV, 390-410HV, and 490-510HV, a hardness tester is used to measure the specific hardness data, and a press is used to measure the strength of a 10cm×10cm×10cm blank.

[0056] After the hardness tester has finished testing the hardness data, a speed plunger is immediately used to measure the average speed of the plunger from the surface of the blank to the bottom.

[0057] The so-called curve establishment means that the plunger descent speed measured at each hardness is used as the horizontal axis, and the specific hardness measured by the hardness tester is used as the vertical axis, and the relationship curve between the descent speed and hardness is established through relationship fitting. The plunger descent speed measured at each hardness is used as the horizontal axis, and the strength measured by the press is used as the vertical axis, and the relationship curve between the descent speed and strength is established through relationship fitting.

[0058] In a preferred embodiment of the present invention, the detection method further comprises the step of obtaining a hardness and strength variation curve of the aerated concrete body to be tested by using the hardness and strength data at different descending height positions inside the aerated concrete body to be tested.

[0059] According to one aspect of the present invention, the speed plunger used for detection in the above detection method comprises: a long rectangular channel steel 1, a concave bearing 2, a steel plunger 5 and a plunger speed monitoring device 3;

[0060] The concave bearing 2 comprises a first outer ring groove bearing 21 and a second outer ring groove bearing 22, the first outer ring groove bearing 21 and the second outer ring groove bearing 22 are slidably arranged in the long rectangular channel steel 1, and the axial direction of the bearing is perpendicular to the long surface of the long rectangular channel steel 1;

[0061] The first outer ring groove bearing 21 and the second outer ring groove bearing 22 are arranged adjacent to each other, and the adjacent grooves of the two bearings form a cylindrical hole, and the steel plug rod 5 is inserted from the cylindrical hole, and the diameter of the steel plug rod 5 is the same as the diameter of the cylindrical hole;

[0062] The rod insertion speed monitoring device 3 is arranged on the long rectangular channel steel 1 and is used to monitor the descending speed of the steel rod 5 .

[0063] The speed plunger for detection provided by the present invention comprises: a long rectangular channel steel 1, a concave bearing 2, a steel plunger 5 and a plunger speed monitoring device 3; wherein: the concave bearing 2 comprises a first outer ring groove bearing 21 and a second outer ring groove bearing 22, the first outer ring groove bearing 21 and the second outer ring groove bearing 22 can be slidably arranged in the long rectangular channel steel 1 and arranged adjacently, the adjacent grooves of the two bearings form a cylindrical hole, the steel plunger 5 is inserted from the cylindrical hole, and the diameter of the steel plunger 5 is the same as the diameter of the cylindrical hole. The above-mentioned speed plunger controls the falling position of the steel plunger 5 through the cylindrical hole formed by the first outer ring groove bearing 21 and the second outer ring groove bearing 22, and at the same time, during the falling process of the steel plunger 5, the plunger speed monitoring device 3 is used to detect the falling speed of the steel plunger 5, and then the falling speed of the steel plunger 5 is monitored. Therefore, the above-mentioned speed plunger of the present application can realize the monitoring of the falling speed of the steel plunger 5 at different positions of the aerated concrete blank according to the adjustment of the falling position of the steel plunger 5.

[0064] In a preferred embodiment of the present invention, the diameter of the cylindrical hole is 1.5 cm, and the steel rod 5 is inserted into the cylindrical hole formed by two adjacent grooves of the bearings, and the diameter of the rod is the same as the diameter of the cylindrical hole.

[0065] In a preferred embodiment of the present invention, the rod insertion speed monitoring device 3 is an electrical laser speed monitor 31 .

[0066] Preferably, the electrical laser speed monitor 31 is arranged at 10 to 20 cm on one side of the steel rod 5 .

[0067] As a preferred embodiment, a rechargeable laser speed monitor 31 is set at 10 to 20 cm on one side of the steel rod 5, which can monitor the descent speed of the rod according to the height and time of the rod descent, and transmit the speed and rod descent height data to the terminal through signals.

[0068] In a preferred embodiment of the present invention, the surface of the steel rod 5 is coated with a fluorocarbon coating 6 .

[0069] As a preferred embodiment, the steel rod 5 has an embedded scale mark, the lower part is conical, and the surface of the steel rod 5 has a fluorocarbon coating 6, which can greatly reduce the friction between the rod and the blank.

[0070] In a preferred embodiment of the present invention, fixed slots 4 are provided at both ends of the long rectangular channel steel 1 .

[0071] As a preferred embodiment, both ends of the long rectangular channel steel 1 are provided with fixing slots 4, which can fix the speed rod device on the mold, and further fix the aerated concrete body to be tested.

[0072] The technical solution of the present invention will be further described below in conjunction with embodiments.

[0073] Example 1

[0074] Figure 1 This is a schematic front view of the structure of the speed plug for detection provided in this embodiment.

[0075] Figure 2 A schematic top view of the structure of the speed plug for detection provided in this embodiment.

[0076] Figure 3 A schematic diagram of the structure of the long rectangular channel steel 1 of the speed detection rod provided in this embodiment.

[0077] See also Figure 1 to Figure 3 , a speed plunger for detection, comprising: a long rectangular channel steel 1, a concave bearing 2, a steel plunger 5 and a plunger speed monitoring device 3;

[0078] The concave bearing 2 comprises a first outer ring groove bearing 21 and a second outer ring groove bearing 22. The first outer ring groove bearing 21 and the second outer ring groove bearing 22 are slidably disposed in the long rectangular channel steel 1, and the axial direction of the bearing is perpendicular to the long surface of the long rectangular channel steel 1.

[0079] The first outer ring groove bearing 21 and the second outer ring groove bearing 22 are arranged adjacent to each other, and the adjacent grooves of the two bearings form a cylindrical hole, and the steel plug rod 5 is inserted from the cylindrical hole, and the diameter of the steel plug rod 5 is the same as the diameter of the cylindrical hole;

[0080] The rod insertion speed monitoring device 3 is arranged on the long rectangular channel steel 1 and is used to monitor the descending speed of the steel rod 5 .

[0081] The detection speed rod provided in the present embodiment controls the falling position of the steel rod 5 through the cylindrical hole formed by the first outer ring groove bearing 21 and the second outer ring groove bearing 22. At the same time, during the falling process of the steel rod 5, the falling speed of the steel rod 5 is detected by the rod speed monitoring device 3, and then the descending speed of the steel rod 5 is monitored. Therefore, the above-mentioned speed rod of the present application can be adjusted according to the falling position of the steel rod 5 to realize the monitoring of the descending speed of the steel rod 5 at different positions of the aerated concrete body.

[0082] As a preferred implementation of this embodiment, the diameter of the cylindrical hole is 1.5 cm, and the steel rod 5 is inserted into the cylindrical hole formed by the adjacent grooves of the two bearings, and the diameter of the rod is the same as the diameter of the cylindrical hole.

[0083] As a preferred implementation of this embodiment, the rod speed monitoring device 3 is an electrical laser speed monitor 31, and the electrical laser speed monitor 31 can monitor the descent speed of the rod according to the height and time of the descent of the rod, and transmit the speed and rod descent height data to the terminal through a signal.

[0084] Preferably, the electrical laser speed monitor 31 is arranged at 10 to 20 cm on one side of the steel rod 5 .

[0085] As a preferred implementation of this embodiment, the steel rod 5 has embedded scale marks, the lower part is conical, and the surface of the steel rod 5 has a fluorocarbon coating 6, which can greatly reduce the friction between the rod and the blank.

[0086] As a preferred implementation of this embodiment, both ends of the long rectangular channel steel 1 are provided with fixing slots 4, which can fix the speed rod device on the mold, and further fix the aerated concrete body to be tested.

[0087] Example 2

[0088] A method for detecting the hardness and strength of an aerated concrete body comprises the following steps:

[0089] (1) After mixing and pouring aerated concrete according to the proportion, the aerated concrete was respectively poured into 50cm×50cm×60cm and 15 10cm×10cm×10cm molds. In the 50cm×50cm×60cm mold, the gas height of the aerated concrete was controlled to be 6cm after the gas emission was completed by adjusting the slurry volume. In the 10cm×10cm×10cm mold, the gas height of the aerated concrete was controlled to be 10cm after the gas emission was completed by adjusting the slurry volume.

[0090] (2) After the gasification is completed, the green body and the mold are placed in an environment with a temperature of 55 and a humidity of 95% for curing. By extending the curing time, the green body has different hardness and strength.

[0091] When the hardness is 90-110HV, 190-210HV, 290-310HV, 390-410HV, 490-510HV, the specific hardness data measured by the hardness tester are 100HV, 205HV, 295HV, 405HV, 505HV respectively;

[0092] The strength of the 10cm×10cm×10cm green body measured by a press was 0.03MPa, 0.08MPa, 0.14MPa, 0.22MPa and 0.35MPa respectively.

[0093] (3) After the hardness tester has finished testing the hardness data, the speed plunger provided in Example 1 is immediately used to measure the average speeds of the plunger from the surface of the blank to the bottom in the above step (2), which are 56 mm / s, 20 mm / s, 8 mm / s, 3 mm / s, and 1 mm / s respectively.

[0094] The process of measuring the speed plunger provided in Example 1 is as follows: the tip of the bottom of the plunger is brought into contact with the aerated surface of the aerated concrete, the plunger is released, and the time is recorded. When the plunger falls until the tip touches the bottom of the mold, the timing is stopped. The average speed of the speed plunger from the surface of the blank to the bottom is the height of the blank divided by the time the speed plunger falls.

[0095] (4) The descending speed of the speed plunger measured at each hardness is 56 mm / s, 20 mm / s, 8 mm / s, 3 mm / s, and 1 mm / s as the horizontal axis, and the specific hardness 100 HV, 205 HV, 295 HV, 405 HV, and 505 HV measured by the hardness tester is used as the vertical axis. The relationship curve between the descending speed and the hardness is established by fitting the relationship formula:

[0096] Y=-412.8exp(-x / 12)+500.9,R 2 =0.97. (Where: Y is the hardness of the point to be tested, x is the descent speed, R 2 is the correlation coefficient).

[0097] The descending speed of the speed plunger measured at each hardness is 56mm / s, 20mm / s, 8mm / s, 3mm / s, and 1mm / s as the horizontal axis, and the specific strength measured by the press machine is 0.03MPa, 0.08MPa, 0.14MPa, 0.22MPa, and 0.35MPa as the vertical axis. The relationship curve between the descending speed and the strength is established as follows:

[0098] Y=-0.35exp(-x / 23)+0.38,R 2 =0.99. (Where: Y is the strength of the measuring point, x is the falling speed, R 2 is the correlation coefficient).

[0099] (5) When measuring the hardness and strength of the blank to be tested, a speed plunger is used to measure the speed of the plunger at different descending heights. The speed data is respectively brought into the descending speed-hardness and descending speed-strength relationship curves, and the hardness and strength data at different positions of the blank can be calculated, and the hardness and strength change curves can be drawn. By adjusting the position of the concave bearing 2 and the position of the channel steel, the hardness and strength of the aerated concrete blank to be tested at any point in the three-dimensional space can be measured.

[0100] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for detecting the internal hardness and strength of an aerated concrete body, characterized in that: The detection method comprises: Based on the average descending speed of the speed plunger under different hardness and strength of aerated concrete blanks, the relationship curves of the speed plunger descending speed-hardness and the relationship curves of the speed plunger descending speed-strength are fitted and established; The aerated concrete body to be tested is tested using a speed rod, and the speed data of the speed rod at different descending heights in the body are recorded. The speed data are substituted into the speed rod descending speed-hardness relationship curve and the speed rod descending speed-strength relationship curve to obtain the hardness and strength data at different descending heights inside the aerated concrete body to be tested.

2. The detection method according to claim 1, characterized in that: The fitting method for establishing the relationship curve between the speed plunger descent speed and hardness and the relationship curve between the speed plunger descent speed and strength comprises: (A) mixing and pouring aerated concrete into aerated concrete bodies of different hardness and strength; (B) using a speed plunger to measure the average descending speed of the plunger from the surface to the bottom of the blank with different hardness, recorded as the descending speed A; The descending speed A of the speed plunger measured at each hardness is used as the horizontal coordinate, and the hardness of the blank is used as the vertical coordinate, to establish a descending speed-hardness relationship curve; (C) using a speed plunger to measure the average descending speed of the plunger from the surface to the bottom of the blank with different strengths, recorded as the descending speed B; The descending speed B of the speed plunger measured at each hardness is used as the abscissa, and the strength of the blank is used as the ordinate, so as to establish a descending speed-strength relationship curve.

3. The detection method according to claim 2, characterized in that: In the step (A), aerated concrete bodies of different hardness and strength are prepared by body curing.

4. The detection method according to claim 3, characterized in that: The green body curing time is 20 to 240 minutes.

5. The detection method according to claim 3, characterized in that: The temperature of the green body curing is 45-60° C., and the humidity is 80-100%.

6. The detection method according to claim 1, characterized in that: The detection method further comprises the step of obtaining a hardness and strength variation curve of the aerated concrete body to be tested by using the hardness and strength data of different descending height positions inside the aerated concrete body to be tested.

7. The detection speed plunger in the detection method according to any one of claims 1 to 5, characterized in that: The speed plunger comprises: a long rectangular channel steel (1), a concave bearing (2), a steel plunger (5) and a plunger speed monitoring device (3); The concave bearing (2) comprises a first outer ring groove bearing (21) and a second outer ring groove bearing (22), wherein the first outer ring groove bearing (21) and the second outer ring groove bearing (22) are slidably arranged in the long rectangular channel steel (1), and the axial direction of the bearing is perpendicular to the long surface of the long rectangular channel steel (1); The first outer ring groove bearing (21) and the second outer ring groove bearing (22) are arranged adjacent to each other, and the adjacent grooves of the two bearings form a cylindrical hole, and the steel insertion rod (5) is inserted from the cylindrical hole, and the diameter of the steel insertion rod (5) is the same as the diameter of the cylindrical hole; The rod insertion speed monitoring device (3) is arranged on the long rectangular channel steel (1) and is used to monitor the descending speed of the steel rod insertion rod (5).

8. The speed plunger according to claim 7, characterized in that: The rod insertion speed monitoring device (3) is an electrical laser speed monitor (31).

9. The speed plunger according to claim 7, characterized in that: The surface of the steel rod (5) is coated with a fluorocarbon coating (6).

10. The speed plunger according to claim 7, characterized in that: The long rectangular channel steel (1) is provided with a fixing slot (4) for fixing to the aerated concrete body to be tested.

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