CN213181341U - Quick detection device of concrete expanding agent - Google Patents
Quick detection device of concrete expanding agent Download PDFInfo
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- CN213181341U CN213181341U CN202021388692.9U CN202021388692U CN213181341U CN 213181341 U CN213181341 U CN 213181341U CN 202021388692 U CN202021388692 U CN 202021388692U CN 213181341 U CN213181341 U CN 213181341U
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Abstract
The utility model discloses a rapid detection device for concrete expanding agent, which is characterized in that a disposable cup is placed in a heat-insulating cup, a gap is arranged between the outer wall of the disposable cup and the inner wall of the heat-insulating cup, and a cup cover is sealed and covered on the heat-insulating cup; the temperature and humidity sensor comprises a temperature and humidity sensor, a temperature measuring line and a recorder, a first hole, a second hole and a third hole are formed in the cup cover, the hard rod is made of a heat insulation material, the temperature and humidity sensor is fixed at the lower end of the hard rod, the lower end of the hard rod penetrates through the first hole and is inserted into the disposable cup, one end of the temperature measuring line is connected with the temperature and humidity sensor, the temperature measuring line is fixed on the hard rod along the axial direction of the hard rod and extends out of the cup cover, the other end of the temperature measuring line is connected with the recorder outside the cup cover, and the hard rod and the; the second hole is hermetically connected with 1 hollow tube, a carrier cavity is arranged on the hollow tube, and the carrier cavity is internally provided with a water-variable color material. The device can be used for rapidly and qualitatively detecting the reactivity of the expanding agent, and avoids human errors.
Description
Technical Field
The utility model belongs to the technical field of the concrete expanding agent performance detects, especially a quick detection device of concrete expanding agent.
Background
The expanding agent is an additive of cement-based materials, is used for preparing shrinkage-compensating concrete and solves the problem of cracking of concrete structures due to shrinkage. At present, in the national expanding agent standard GB/T23439, a beer bottle and beaker test method is mainly used for on-site rapid detection of concrete expanding agents, the two methods have similar principles, and the method mainly comprises the steps of doping the expanding agent into cement, adding water for stirring, pouring the mixture into the beer bottle or the beaker, and observing whether the beer bottle or the beaker is cracked. The two methods have the advantages of simple operation, easy acquisition of test materials and easy observation of cracking, but have the defects that the beer bottle is cracked after 1d generally, the detection period is slightly long, and the rapid qualitative and quantitative detection and comparison of the activities of concrete expanding agents with different activities cannot be carried out.
The granted chinese patent CN204302160U provides a device for rapidly detecting on-site concrete expanding agent, which measures the length change of a test piece through a set of special devices, and the test piece is maintained under high temperature condition to stimulate all the expansion reaction in a short time. The test operation is complex, the high-temperature curing condition is difficult to implement on a common site, and the detection period is not greatly different from the test of beer bottles and beakers.
The granted Chinese patent CN207300839U provides a device for rapidly detecting a concrete expanding agent on site, which measures the length change of a concrete sample doped with the expanding agent through a set of special devices, and the test detection period of the device is not much different from that of beer bottles and beakers.
The granted Chinese patent CN208833725U provides a device for rapidly detecting the activity of an on-site concrete expanding agent, which is characterized in that a sensor is connected with a computer to measure the length change of a test piece doped with the expanding agent in real time, and the test detection period of the device has no obvious advantages compared with the test of beer bottles and beakers.
The prior art mainly mixes the expanding agent into the cement-based material, detects the performance of the expanding agent by observing the length change of the test piece, and the detection test period depends on the hydration rate of the cement-based material, so that the general test period is over 1d, which is not favorable for the requirement of quick detection of the concrete expanding agent.
Disclosure of Invention
In order to solve the problems of the prior art, the utility model provides a concrete expanding agent rapid detection device, the hydration reaction of the expansion source of the present expanding agent is accompanied by a large amount of heat production, and its heat release rate is closely related with the reactivity of expanding agent, consequently through the effect of indirect detection exotherm, just can judge the effect of expanding agent fast directly perceivedly, specifically realize through following technical scheme.
A quick detection device for a concrete expanding agent comprises a temperature and humidity sensor, a hard rod, a vacuum cup, a cup cover and a disposable cup, wherein the disposable cup is positioned in the vacuum cup, a gap is formed between the outer wall of the disposable cup and the inner wall of the vacuum cup, and the cup cover is sealed and covered on the vacuum cup;
the temperature and humidity sensor comprises a temperature and humidity sensor, a temperature measuring line and a recorder, a first hole, a second hole and a third hole are formed in the cup cover, the hard rod is made of heat insulation materials, the temperature and humidity sensor is fixed at the lower end of the hard rod, the lower end of the hard rod penetrates through the first hole and is inserted into the disposable cup, one end of the temperature measuring line is connected with the temperature and humidity sensor, the temperature measuring line is fixed on the hard rod along the axial direction of the hard rod and extends out of the cup cover, the other end of the temperature measuring line is connected with the recorder outside the cup cover, and the hard rod and the first hole are arranged in a sealing mode; the second hole is hermetically connected with 1 hollow tube, a carrier cavity is arranged on the hollow tube, and a water-variable color material is arranged in the carrier cavity.
The working principle of the detection device is as follows:
(1) adding water into the expanding agent to prepare pure expanding agent slurry, uniformly stirring the pure expanding agent slurry, pouring the pure expanding agent slurry into the disposable cup, and then placing the disposable cup into the thermos cup, wherein a gap between the outer wall of the disposable cup and the inner wall of the thermos cup can ensure that the expansion of the pure expanding agent slurry during hydration reaction is not limited;
(2) a non-heat-conducting hard rod is inserted into a first hole of the cup cover, so that the temperature and humidity sensor is embedded at a certain depth in the expanding agent pure slurry, a temperature measuring line is fixed on the hard rod and extends out of the first hole together with the hard rod, and the other end of the temperature measuring line is connected with a recorder; the first hole is connected with the hard rod in a sealing way to prevent the water vapor and heat in the vacuum cup from dissipating;
(3) the method comprises the following steps that (1) hydration reaction is carried out on pure swelling agent slurry in a disposable paper cup, the formed pure swelling agent slurry expands and bursts the disposable cup under the action of the swelling agent and releases heat, the disposable cup is made of paper cups or other materials which are easy to burst, the temperature in a vacuum cup reaches over 70 ℃, water in the pure swelling agent slurry is rapidly evaporated, a temperature and humidity sensor is used for detecting the temperature change of the interior of the pure swelling agent slurry during the hydration reaction, and a recorder records a temperature value at regular intervals;
(4) one part of water vapor generated by rapid evaporation overflows from the third hole, the other part of water vapor enters the hollow tube and the carrier cavity from the second hole, the color of the water-encountering color-changing material in the carrier cavity is changed by the action of the water vapor, the time of the temperature rise peak value and the appearance time of the peak value recorded by the recorder, and the color change time and the change depth degree of the water-encountering color-changing material are used for rapidly judging the reaction activity of the concrete expanding agent. When the activities of different swelling agents need to be compared on site quickly, the color change condition of the water-variable color material can be directly observed, if further detection and comparison are needed, a temperature change curve of the swelling agent net slurry during hydration reaction can be drawn according to the data of a recorder, and the activity of the swelling agent is subjected to semi-quantitative analysis;
(5) the test can be finished only by 1 hour generally, the pure slurry of the expanding agent is not completely solidified when the test is finished, expansion cracking also exists, and the temperature measuring line and the temperature and humidity sensor are easy to take out.
Preferably, the water-variable color material is anhydrous copper sulfate, water-variable silica gel or a flat plate coated with water-variable ink. Anhydrous copper sulfate, silica gel or ink which changes color when meeting water belong to common materials in the market, and can change color under the influence of water vapor, for example, white anhydrous copper sulfate powder changes into blue anhydrous copper sulfate when meeting water vapor; the higher the water vapor concentration is, the more obvious the color change degree of the color-changeable material when meeting water is; after drying, the materials can be reduced to the original color again, and the materials can be recycled.
Preferably, the hollow end of the hollow tube is connected with a moisture absorption cavity, and a moisture absorption material is arranged in the moisture absorption cavity. The moisture absorption material mainly prevents external water vapor from entering the carrier cavity, and the moisture absorption material can be common water absorption materials such as calcium chloride and calcium oxide.
Preferably, the hard rod is made of a hollow material, and the temperature measuring line is located in a cavity in the middle of the hard rod. The temperature measuring line is arranged inside the hard rod, so that the sealing connection between the hard rod and the first hole is easier to ensure.
Preferably, the hard rod and the first hole are sealed through a rubber mud or silica gel sealing ring. The plasticine can be arbitrarily kneaded into any shape, so that the hard rod and the first hole are completely sealed; the rubber sealing ring can be set into a specific shape, and a space for the hard rod and the temperature measuring line is reserved, and a certain interference magnitude is provided, so that the hard rod and the temperature measuring line are sealed with the first hole.
Preferably, the surface of the hard rod is provided with a scale. The scales are used for judging the depth of the hard rod, and further judging and confirming whether the temperature and humidity sensor is buried in a proper position of the pure slurry of the expanding agent.
Preferably, a one-way valve plate is arranged on the third hole, and the airflow direction of the one-way valve plate is from the disposable cup to the outside of the cup cover. The function of one-way valve piece is to prevent that too much vapor from overflowing from the third hole, makes the effect of meeting water variable color material more obvious in the second hole.
Preferably, the gap between the wall of the disposable cup and the wall of the vacuum cup is not less than 5 mm.
Preferably, the cup cover is made of heat-insulating transparent materials. The double-layer heat-insulating glass material can be selected, the effect is heat insulation, and the expansion condition of the pure slurry of the expanding agent in the vacuum cup can be visually observed.
Preferably, the diameter of the second bore is at least 2 times the diameter of the third bore. The function of the color-changing material is to prevent excessive water vapor from overflowing from the third hole, so that the function of the color-changing material in the second hole is more obvious.
Compared with the prior art, the beneficial effects of the utility model are that:
1. this device can be fast qualitative detection expanding agent's reactivity, and whole process is automatic goes on, and record appearance automatic record data has avoided human error.
2. The expansion agent neat paste added with the expansion agent can reach the highest temperature peak within 1 hour and generate the spalling of different degrees, and compared with the detection period of 1-2 days of beer bottle and beaker tests, the detection period is obviously shortened;
3. the device is simple to assemble, can be repeatedly used except for the disposable cup, and is green and environment-friendly.
Drawings
Fig. 1 is a schematic view of the internal structure of a device for rapidly detecting a concrete expansive agent according to embodiment 1;
fig. 2 is a schematic view of the internal structure of the device for rapidly detecting a concrete expansive agent according to embodiment 2;
FIG. 3 is a graph showing the temperature change of an expansive agent neat paste using HCSA concrete expansive agent (national Standard type I) measured by the apparatus of example 1;
FIG. 4 is a graph of the temperature change of an expander neat paste using FQY high performance expander (type I, national standard) measured using the apparatus of example 1;
FIG. 5 is a graph showing the temperature change of an expansive agent neat paste using HCSA concrete expansive agent (national Standard type II) measured by the apparatus of example 1;
FIG. 6 is a graph of the temperature change of an expander neat paste using FQY high performance expander (type II national standard) measured using the apparatus of example 1;
FIG. 7 is a graph of net slurry temperature change using fly ash, plotted using the apparatus of example 1;
in the figure: 1. a rigid rod; 2. a vacuum cup; 3. a cup cover; 4. a disposable cup; 5. a temperature and humidity sensor; 6. a temperature measuring line; 7. a recorder; 8. a first hole; 9. a second hole; 10. a third aperture; 11. plasticine; 12. a hollow tube; 13. a carrier chamber; 14. silica gel changing color when meeting water; 15. a moisture-absorbing chamber; 16. a moisture absorbent material; 17. calibration; 18. a one-way valve plate.
Detailed Description
The technical solutions of the embodiments in this patent will be described clearly and completely with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments, not all embodiments, of this patent. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the patent without making creative efforts, shall fall within the protection scope of the patent.
In the description of this patent, it is noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "top", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing the patent and for simplicity in description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the patent. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of this patent, it is noted that, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "communicating" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. It is to be noted that all the figures are exemplary representations. The meaning of the above terms in this patent may be specifically understood by those of ordinary skill in the art.
The patent is described in further detail below with reference to specific embodiments and with reference to the attached drawings.
Example 1
As shown in fig. 1, the device for rapidly detecting a concrete expanding agent provided by the embodiment includes a temperature and humidity sensor, a rigid rod 1, a vacuum cup 2, a cup cover 3 and a disposable cup 4, wherein the disposable cup 4 is located in the vacuum cup 2, a gap is formed between an outer wall of the disposable cup 4 and an inner wall of the vacuum cup 2, and the cup cover 3 is hermetically covered on the vacuum cup 2;
the temperature and humidity sensor comprises a temperature and humidity sensor 5, a temperature measuring line 6 and a recorder 7, a first hole 8, a second hole 9 and a third hole 10 are formed in the cup cover 3, the hard rod 1 is made of a heat insulation material, the temperature and humidity sensor 5 is fixed at the lower end of the hard rod 1, the lower end of the hard rod 1 penetrates through the first hole 8 and is inserted into the disposable cup 4, one end of the temperature measuring line 6 is connected with the temperature and humidity sensor 5, the temperature measuring line 6 is fixed on the hard rod 1 along the axial direction of the hard rod 1 and extends out of the cup cover 3, the other end of the temperature measuring line 6 is connected with the recorder 7 outside the cup cover 3, and the hard rod 1 and the first hole 8 are sealed through a plasticine 11; sealed connection 1 hollow tube 12 on the second hole 9, be equipped with carrier chamber 13 on the hollow tube 12, be equipped with in the carrier chamber 13 and meet water color-changing silica gel 14.
The working principle of the detection device is as follows:
(1) pouring the pure slurry of the expanding agent into a disposable cup after uniformly stirring, and then putting the disposable cup into the thermos cup, wherein a gap between the outer wall of the disposable cup and the inner wall of the thermos cup can ensure that the expansion of the pure slurry of the expanding agent during solidification and molding is not limited;
(2) a non-heat-conducting hard rod is inserted into a first hole of the cup cover, so that the temperature and humidity sensor is embedded at a certain depth in the expanding agent pure slurry, a temperature measuring line is fixed on the hard rod and extends out of the first hole together with the hard rod, and the other end of the temperature measuring line is connected with a recorder; the first hole is connected with the hard rod in a sealing way to prevent the water vapor and heat in the vacuum cup from dissipating;
(3) the method comprises the following steps that (1) hydration reaction is carried out on pure swelling agent slurry in a disposable paper cup, the formed pure swelling agent slurry expands and bursts the disposable cup under the action of the swelling agent and releases heat, the disposable cup is made of paper cups or other materials which are easy to burst, the temperature in a vacuum cup reaches over 70 ℃, water in the pure swelling agent slurry is rapidly evaporated, a temperature and humidity sensor is used for detecting the temperature change of the interior of the pure swelling agent slurry during the hydration reaction, and a recorder records a temperature value at regular intervals;
(4) one part of vapor that flash evaporation produced overflows from the third hole, and another part gets into hollow tube and carrier chamber from the second hole, and the colour of meeting water color-changing silica gel in the carrier chamber is discoloured by the vapor effect, and according to the time that the peak value that the record appearance recorded temperature rises and the peak appears to and the colour change time and the change depth degree of meeting water color-changing silica gel, thereby the reactivity of concrete expanding agent is judged fast. When the activities of different swelling agents need to be compared on site quickly, the color change condition of the water-variable color material can be directly observed, if further detection and comparison are needed, a temperature change curve of the swelling agent pure slurry during hydration reaction can be drawn according to the data of a recorder, and the activity of the swelling agent is quantitatively analyzed;
(5) the test can be finished only by 1 hour generally, the pure slurry of the expanding agent is not completely solidified when the test is finished, expansion cracking also exists, and the temperature measuring line and the temperature and humidity sensor are easy to take out.
Example 2
As shown in fig. 2, the rapid detection device for a concrete expansive agent provided in this embodiment is optimized on the basis of embodiment 1 as follows:
1. the hollow end of the hollow pipe 12 is connected with a moisture absorption cavity 15, and moisture absorption materials 16 are arranged in the moisture absorption cavity 15;
2. the hard rod 1 is made of a hollow material, and the temperature measuring line 6 is positioned in a cavity in the middle of the hard rod 1;
3. the surface of the hard rod 1 is provided with scales 17;
4. a one-way valve plate 18 is arranged on the third hole 10, and the air flow direction of the one-way valve plate 18 is from the disposable cup 4 to the outside of the cup cover 3;
5. the second bore 9 has a diameter 2 times larger than the third bore 10.
Application example: the reactivity of HCSA concrete expanding agent, FQY high performance expanding agent, and fly ash was measured using the measuring apparatus of example 1.
The concrete expansion agents tested using the apparatus of example 1 were produced in the following places: the HCSA concrete expanding agent (national standard type I and type II) is from Henan of China, the FQY high-performance expanding agent (national standard type I and type II) is from Hubei of China, and the fly ash is from Hubei of China.
The test mode is as follows:
(1) weighing 300.0g of concrete expanding agent, 105.0g of water and 0.35 of water-cement ratio, pouring into a cement paste stirring pot, stopping stirring for 15s after slowly stirring for 15s on a planetary cement paste stirring machine, quickly stirring for 60s, stopping stirring, pouring the slurry into a disposable cup, wherein the mass of the poured slurry is 300.0 g;
(2) the cup cover is covered, the hard rod is inserted to ensure that the depth of the temperature and humidity sensor inserted into the clean slurry is half of the height of the clean slurry, and the other end of the temperature and humidity sensor is connected with the recorder;
(3) after the whole device is placed stably, reading temperature data on a recorder, recording the temperature data as the mold-entering temperature, and then recording the whole process that the neat paste temperature rises from the mold-entering temperature to the temperature peak and falls to the room temperature;
(4) and after the detection is finished, analyzing the temperature peak value and the temperature peak appearance time in a short time, and observing whether the disposable cup cracks or not and recording. The temperature change curves of the neat pastes using the HCSA concrete expanding agent (national standard type I), the FQY high-performance expanding agent (national standard type I), the HCSA concrete expanding agent (national standard type II), the FQY high-performance expanding agent (national standard type II) and the fly ash, which are drawn by the device of example 1, are shown in the figure.
Further, the cup/bottle cracking of the neat slurry using HCSA concrete expansive agent (national Standard type II) and fly ash was measured by the beer bottle Rapid test method of GB/T23439, and the results were recorded as comparative examples 1 and 2, and are specifically shown in Table 1 below.
TABLE 1 compression Strength and Net mortar setting time test results for the mortars of application examples 1 to 5 of example 1 and comparative examples 1 and 2
As can be seen from table 1 above, the temperature rise data of the concrete expanding agents of different manufacturers and models are obviously different, and one of the same points is that the temperature rise process gradually reaches the temperature peak and starts to decrease to the room temperature in about 1 hour; secondly, the cracking time of the cup body is advanced to a certain extent compared with the temperature peak time. The bottle (cup) body of contrast beer bottle split time, generally at 1 ~ 2d, test time is obvious longer, and the concrete expanding agent of different producers, model is not convenient for distinguish.
The above embodiments describe the implementation of the present invention in detail, however, the present invention is not limited to the specific details of the above embodiments. Within the scope of the claims and the technical idea of the present invention, various simple modifications and changes can be made to the technical solution of the present invention, and these simple modifications all belong to the protection scope of the present invention.
Claims (10)
1. A quick detection device for a concrete expanding agent is characterized by comprising a temperature and humidity sensor, a hard rod, a vacuum cup, a cup cover and a disposable cup, wherein the disposable cup is positioned in the vacuum cup, a gap is formed between the outer wall of the disposable cup and the inner wall of the vacuum cup, and the cup cover is sealed and covered on the vacuum cup;
the temperature and humidity sensor comprises a temperature and humidity sensor, a temperature measuring line and a recorder, a first hole, a second hole and a third hole are formed in the cup cover, the hard rod is made of heat insulation materials, the temperature and humidity sensor is fixed at the lower end of the hard rod, the lower end of the hard rod penetrates through the first hole and is inserted into the disposable cup, one end of the temperature measuring line is connected with the temperature and humidity sensor, the temperature measuring line is fixed on the hard rod along the axial direction of the hard rod and extends out of the cup cover, the other end of the temperature measuring line is connected with the recorder outside the cup cover, and the hard rod and the first hole are arranged in a sealing mode; the second hole is hermetically connected with 1 hollow tube, a carrier cavity is arranged on the hollow tube, and a water-variable color material is arranged in the carrier cavity.
2. The device for rapidly detecting the concrete expanding agent according to claim 1, wherein the water-variable color material is anhydrous copper sulfate, water-color-changing silica gel or a flat plate coated with water-color-changing ink.
3. The device for rapidly detecting the concrete expanding agent according to claim 1, wherein the vacant end of the hollow pipe is connected with a moisture absorption cavity, and a moisture absorption material is arranged in the moisture absorption cavity.
4. The device for rapidly detecting the concrete expanding agent according to claim 1, wherein the hard rod is made of a hollow material, and the temperature measuring line is positioned in a cavity in the middle of the hard rod.
5. The device for rapidly detecting the concrete expanding agent as claimed in claim 1, wherein the hard rod and the first hole are sealed by a plasticine or silica gel sealing ring.
6. The device for rapidly detecting the concrete expanding agent according to claim 1, wherein scales are arranged on the surface of the hard rod.
7. The device for rapidly detecting the concrete expanding agent according to claim 1, wherein a one-way valve plate is arranged on the third hole, and the air flow direction of the one-way valve plate is from the disposable cup to the outside of the cup cover.
8. The rapid detection device for concrete expansive agents as claimed in claim 1, wherein the gap between the wall of the disposable cup and the wall of the vacuum cup is not less than 5 mm.
9. The device for rapidly detecting the concrete expanding agent according to claim 1, wherein the cup cover is made of a heat-insulating transparent material.
10. The rapid concrete expansive agent detection device of claim 1, wherein the diameter of the second hole is at least 2 times that of the third hole.
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| CN114910224A (en) * | 2022-07-14 | 2022-08-16 | 湖北工业大学 | Instrument test system for civil construction |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114910224A (en) * | 2022-07-14 | 2022-08-16 | 湖北工业大学 | Instrument test system for civil construction |
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