CN113804864A - Method for testing air entraining performance of air entraining agent for concrete - Google Patents
Method for testing air entraining performance of air entraining agent for concrete Download PDFInfo
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- 238000012545 processing Methods 0.000 claims abstract description 32
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 239000004568 cement Substances 0.000 claims abstract description 14
- 239000011148 porous material Substances 0.000 claims abstract description 14
- 239000006260 foam Substances 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 238000010998 test method Methods 0.000 claims abstract description 5
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- 239000007787 solid Substances 0.000 claims description 4
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 claims description 3
- 229910001424 calcium ion Inorganic materials 0.000 claims description 3
- 238000002474 experimental method Methods 0.000 abstract 1
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- 238000002156 mixing Methods 0.000 description 5
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- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 3
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- 238000003756 stirring Methods 0.000 description 3
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- 238000011056 performance test Methods 0.000 description 2
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 1
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 1
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000002518 antifoaming agent Substances 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- PASHVRUKOFIRIK-UHFFFAOYSA-L calcium sulfate dihydrate Chemical compound O.O.[Ca+2].[O-]S([O-])(=O)=O PASHVRUKOFIRIK-UHFFFAOYSA-L 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- MRUAUOIMASANKQ-UHFFFAOYSA-N cocamidopropyl betaine Chemical compound CCCCCCCCCCCC(=O)NCCC[N+](C)(C)CC([O-])=O MRUAUOIMASANKQ-UHFFFAOYSA-N 0.000 description 1
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- 238000003823 mortar mixing Methods 0.000 description 1
- YWFWDNVOPHGWMX-UHFFFAOYSA-N n,n-dimethyldodecan-1-amine Chemical compound CCCCCCCCCCCCN(C)C YWFWDNVOPHGWMX-UHFFFAOYSA-N 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 229940051841 polyoxyethylene ether Drugs 0.000 description 1
- 229920000056 polyoxyethylene ether Polymers 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- OTYBMLCTZGSZBG-UHFFFAOYSA-L potassium sulfate Chemical compound [K+].[K+].[O-]S([O-])(=O)=O OTYBMLCTZGSZBG-UHFFFAOYSA-L 0.000 description 1
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- 235000011152 sodium sulphate Nutrition 0.000 description 1
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- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 1
- 150000008130 triterpenoid saponins Chemical class 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/30—Water reducers, plasticisers, air-entrainers, flow improvers
- C04B2103/304—Air-entrainers
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Medicinal Chemistry (AREA)
- Food Science & Technology (AREA)
- Ceramic Engineering (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
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Abstract
The invention discloses a method for testing the air entraining performance of an air entraining agent for concrete, wherein a testing device comprises an oscillator and a bubble image processing system; the test method comprises the following steps: preparing a simulated cement pore solution, and then adding an air entraining agent to be detected into the simulated cement pore solution to form a liquid to be detected; filling a certain amount of liquid to be tested into a transparent testing container, sealing, and starting a testing device to vibrate and foam; and opening the sealing plug after the oscillation is finished, standing for 5 min, carrying out microspur shooting on a certain square area at the middle position of the bubble, reading the number and the average diameter of the bubble which are imaged and displayed on a display after being processed by the bubble image processing system, and reducing the volume of the bubble and the volume of the bubble of the whole test container by half. The experiment achieves the purpose of air entraining in an oscillation mode, the method can simply, conveniently and effectively evaluate the air entraining performance and the bubble stability of the air entraining agent in the concrete, and has strong practicability.
Description
Technical Field
The invention relates to the technical field of concrete admixtures, in particular to a method for testing the air entraining performance of an air entraining agent for concrete.
Background
In the modern concrete and mortar mixing technology, it is difficult to simply mix a water reducing agent or a slump retaining agent to meet the technical requirements, and in actual construction, the construction condition is often achieved by mixing an air entraining agent, a retarder or a defoaming agent. The air entraining agent is a concrete admixture capable of introducing tiny and stable bubbles into concrete, and the incorporation of the air entraining agent can greatly improve the workability of the concrete admixture, improve the frost resistance of the concrete in a low-temperature environment and improve the durability of the concrete.
The air entraining performance of the existing concrete air entraining agent is generally measured by a gas content measuring instrument, the evaluation method is a gas pressure method, and the evaluation objectivity is low because the gas content is greatly influenced by environmental factors such as gas pressure and operation errors. In order to evaluate the performance of the concrete air entraining agent more accurately, some solutions have been provided through research, and a patent with publication number CN103926174A, publication date 7/16 2014, and named as "evaluation method of air entraining effect of air entraining agent for cement concrete" proposes a method for evaluating the performance of the air entraining agent by measuring the saturated air entraining agent concentration at the inflection point of surface tension change in a calcium hydroxide solution. The patent with the publication number of CN112763379A and the publication number of 2021, 5.7.titled "a method for evaluating the air entraining performance of concrete admixture" discloses a method for evaluating the air entraining agent performance by transversely agitating and entraining air and then vertically standing to read the volume of air bubbles. The patent of prior art grant publication number CN212282957U, grant publication date 1/5/2021 discloses a traditional separating funnel oscillator with an oscillation mode of vertical oscillation, and although this scheme adopts vertical oscillation, the problem caused by the operation mode of horizontal stirring and vertical operation in the prior art is avoided, but this oscillator can not be applied to the fixation of a container with a larger caliber, and is not connected with a bubble image processing system, and can not meet the measurement of the average diameter of the bubbles of the air entraining agent for concrete after air entraining, and can not accurately measure the number of the bubbles in a specific area. Therefore, a device and a method for testing the air-entraining performance are needed.
Disclosure of Invention
1. The technical problem to be solved is as follows:
aiming at the technical problems, the invention provides a method for testing the air entraining performance of an air entraining agent for concrete, which is characterized in that air is introduced into a simulated cement pore solution in an oscillation mode, bubbles are formed through the interface action of the air entraining agent, the purpose of air entraining is achieved, and finally, the air entraining performance and the bubble stability performance of the concrete air entraining agent are accurately evaluated by testing the number and the average diameter of the bubbles in a specific middle plane area and reducing the volume of the bubbles and the volume of the bubbles of a whole test container by half.
2. The technical scheme is as follows:
a testing method for the air entraining performance of an air entraining agent for concrete utilizes a testing device to test, wherein the testing device comprises an oscillator; the method is characterized in that: the test container of the oscillator is a columnar glass container with a graduated upper end opening; the testing device also comprises a bubble image processing system, and a macro lens of the bubble image processing system shoots a foam image of the container wall of the columnar glass container; the bubble image processing system carries out black filling processing on bubbles of the foam image and divides bubble walls, calculates the number of the bubbles and the average diameter of the bubbles in the area of the shot foam image and displays the number and the average diameter of the bubbles through the display device.
The test method specifically comprises the following steps:
the method comprises the following steps: preparing a simulated cement pore solution, and then adding the air entraining agent to be detected into the simulated cement pore solution to form a liquid to be detected.
Step two: and (3) filling a certain amount of liquid to be tested into the test container, sealing the test container, and starting the test device to oscillate and foam the test liquid for a preset oscillation time.
Step three: and opening the sealing plug after the oscillation is finished, standing for 5 min, then carrying out microspur shooting on a square area preset in the middle position of the bubble, reading the number and average diameter of the bubble imaged and displayed on a display after the bubble is processed by the bubble image processing system, and reducing the volume of the bubble and the time for half of the volume of the bubble of the whole test container.
Further, the oscillator comprises a square cushion base; the oscillator comprises a square cushion base; a square main machine shell is vertically arranged in the middle of the surface of the base of the buffer pad; a plurality of groups of oscillating structures capable of oscillating up and down are symmetrically arranged on the left side and the right side of the square main machine shell; the left oscillating structure and the right oscillating structure are positioned at two ends of the main case to oscillate left, right and up and down alternately; each oscillating knot comprises a sliding rod, a container clamp and a container fixing base; the sliding rod can vibrate up and down along with the host; the non-gripping end of the container clamp is slidably connected to a surface of a slide bar; the lower end of each clamp is correspondingly provided with a container fixing base; the middle position of each sliding rod is movably connected with a macro lens of the bubble image processing system; the macro lens is connected with a host of the bubble image processing system and the display device through an interface arranged on the surface of the host shell.
Furthermore, the oscillating structures on the left side and the right side of the main chassis are 2-10 groups.
Furthermore, the diameter of the test container is 2 cm-50 cm, the height of the test container is 5 cm-100 cm, and the bottle mouth is a frosted opening.
Further, in the first step, the concentration of calcium ions in the simulated cement pore solution is 0.001-0.02 mol/L, and the pH value of the solution is 10-14.
Further, in the second step, the oscillation amplitude of the testing device is 1 to 1000 times/min, and the preset oscillation time of the testing device is 0.5 to 1440 min.
Further, in the second step, the test oscillation amplitude is 1 to 500 times/min, and the test preset oscillation time is 0.5 to 60 min.
Further, the solid content of the air entraining agent in the liquid to be detected in the step one is 0.001-20 g/L.
Further, the area of the square region described in the third step is 1 mm2~50 mm2。
3. Has the advantages that:
(1) the testing device adopted by the invention is simple, easy to install and more suitable for testing the air entraining performance of the air entraining agent.
(2) The method for testing the air entraining performance of the air entraining agent provided by the invention is less influenced by factors such as environmental air pressure and the like, and has strong contrast. The method effectively achieves the purpose of air entraining by oscillation, and can effectively evaluate the air entraining performance and the bubble stability of the air entraining agent in the concrete. The method introduces a macro lens on the traditional oscillator, avoids experimental errors caused by manual operation, then transmits the shot pictures into a bubble wall processor for processing, and can accurately calculate the number of bubbles in a specific area and the average diameter of the bubbles.
Drawings
FIG. 1 is an overall configuration diagram of a test apparatus according to the present invention;
FIG. 2 is a front view of the testing device of the present invention;
FIG. 3 is a view showing the construction of the test container and the sealing plug of the test apparatus of the present invention;
fig. 4 shows the imaging results of the bubble image processing systems of embodiments 2, 5, and 8 from left to right.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings.
A testing method for the air entraining performance of an air entraining agent for concrete utilizes a testing device to test, wherein the testing device comprises an oscillator; the method is characterized in that: the test container 1 of the oscillator is a columnar glass container with a graduated upper end opening; the testing device also comprises a bubble image processing system 2, wherein a macro lens 3 of the bubble image processing system shoots a foam image of the wall of the cylindrical glass container; the bubble image processing system performs black filling processing on bubbles in the bubble image, divides the bubble wall, calculates the number of bubbles in the area of the shot bubble image and the average diameter of the bubbles, and displays the number and the average diameter of the bubbles through the display device 4.
The test method specifically comprises the following steps:
the method comprises the following steps: preparing a simulated cement pore solution, and then adding the air entraining agent to be detected into the simulated cement pore solution to form a liquid to be detected.
Step two: and (3) filling a certain amount of liquid to be tested into the test container, sealing the test container, and starting the test device to oscillate and foam the test liquid for a preset oscillation time.
Step three: and opening the sealing plug after the oscillation is finished, standing for 5 min, then carrying out microspur shooting on a square area preset in the middle position of the bubble, reading the number and average diameter of the bubble imaged and displayed on a display after the bubble is processed by the bubble image processing system, and reducing the volume of the bubble and the time for half of the volume of the bubble of the whole test container.
Further, the oscillator comprises a square cushion base; the oscillator comprises a square cushion base 5; a square main machine shell 6 is vertically arranged in the middle of the surface of the base of the buffer pad; a plurality of groups of oscillating structures capable of oscillating up and down are symmetrically arranged on the left side and the right side of the square main machine shell; the left oscillating structure and the right oscillating structure are positioned at two ends of the main case to oscillate left, right and up and down alternately; each oscillating knot comprises a sliding rod 7, a container clamp 8 and a container fixing base 9; the sliding rod can vibrate up and down along with the host; the non-gripping end of the container clamp is slidably connected to a surface of a slide bar; the lower end of each clamp is correspondingly provided with a container fixing base; the middle position of each sliding rod is movably connected with a macro lens of the bubble image processing system; the macro lens is connected with a host computer and a display device of the bubble image processing system through an interface 12 arranged on the surface of the host computer shell.
Furthermore, the oscillating structures on the left side and the right side of the main chassis are 2-10 groups.
Furthermore, the diameter of the test container is 2 cm-50 cm, the height of the test container is 5 cm-100 cm, and the bottle mouth is a frosted opening.
The test device adopted in the invention mainly comprises two oscillator parts and a bubble image processing system. The oscillator part is as shown in attached figures 1 to 3, the oscillation speed of the oscillator is controlled by controlling the control panel 11 arranged on the surface of the main case, the premature damage of large bubbles caused by too high stirring speed is avoided, the device oscillates in an up-and-down alternative oscillation mode of left and right ends of a balance-adjusted left and right similar balance, the uniform oscillation of liquid to be measured is ensured, and the technical problem caused by the pure vertical or pure horizontal oscillation mode is effectively prevented. The bubble image processing system is adopted for analyzing the bubbles, the images of the bubbles generated on the wall of the container after oscillation are collected, then the bubble image processing system carries out black filling processing on the bubbles and divides the wall of the bubbles, the number of the bubbles and the radius of the bubbles in a preset range in the images are obtained, and analysis and comparison are carried out according to the data of the bubbles and the radius of the bubbles, so that the performance index of the tested air entraining agent can be obtained.
Further, in the first step, the concentration of calcium ions in the simulated cement pore solution is 0.001-0.02 mol/L, and the pH value of the solution is 10-14.
Further, in the second step, the oscillation amplitude of the testing device is 1 to 1000 times/min, and the preset oscillation time of the testing device is 0.5 to 1440 min.
Further, in the second step, the test oscillation amplitude is 1 to 500 times/min, and the test preset oscillation time is 0.5 to 60 min.
Further, the solid content of the air entraining agent in the liquid to be detected in the step one is 0.001-20 g/L.
Further, the area of the square region described in the third step is 1 mm2~50 mm2。
The specific embodiment is as follows:
the method for evaluating the air entraining performance of the air entraining agent for concrete in the specific embodiment adopts the following steps:
step S01: preparing a simulated cement pore solution: adding 2 g of calcium sulfate dihydrate, 7g of sodium sulfate, 4g of potassium sulfate and 7g of potassium hydroxide into every 1L of deionized water, uniformly shaking, and adding 0.25 g of air entraining agent into the mixture and lightly stirring to form a solution to be detected;
step S02: 200 g of liquid to be tested is put into a testing container, a testing device is started to oscillate and bubble, the used container is a cylindrical glass container with scales, the diameter of the container is 6 cm, the height of the container is 30 cm, the oscillation speed is 350 times/min, and the oscillation time is 1 min.
Step S03: opening the sealing plug 10 after the oscillation is finished, standing for 5 min, and aligning the middle position of the air bubble to 9 mm2And (3) carrying out microspur shooting on the square area, and reading the number of the bubbles and the average diameter of the bubbles which are imaged and displayed on a display after being processed by the bubble image processing system, and the time for reducing the volume of the bubbles and the volume of the bubbles of the whole test container by half.
In the above steps, different kinds of air entraining agents are selected for testing, specifically: the air entraining agent in the embodiment 1 adopts the commercial alpha-alkenyl sodium sulfonate; the air entraining agent in the embodiment 2 is commercially available sodium dodecyl sulfate; the air entraining agent in the embodiment 3 is potassium laureth phosphate which is commercially available; the air entraining agent in the embodiment 4 adopts commercially available fatty alcohol-polyoxyethylene ether AEO-8; the air entraining agent of the embodiment 5 is selected from commercial dodecyl dimethyl ammonium oxide; the air entraining agent of example 6 is commercially available cocamidopropyl betaine; the air entraining agent in the embodiment 7 is a commercial triterpenoid saponin air entraining agent; the air entraining agent in the embodiment 8 is a commercial rosin thermopolymer air entraining agent.
The comparative example is no air entraining agent and is a blank.
For example 1In the test device of example 8 and comparative example 1, while the air entraining performance and the bubble stability performance are tested, the initial slump/expansion, the slump/expansion 1 h time loss, the air content 1 h time loss and the compressive strength of the concrete doped with the corresponding air entraining agent are measured by referring to GB 8076 + 2008 "concrete admixture", and the folding and solid blending amount of the water reducing agent is 0.2% of the dosage of the binder and the air entraining agent blending amount is 0.05% of the dosage of the water reducing agent. FIG. 4 shows imaging results of representative bubble image processing systems of examples 2, 5 and 8, and the results of performance test of air entraining agent are shown in Table 1, wherein BN is the number of bubbles in a specific square area, ABD is the average diameter of bubbles in a specific square area, V is the volume of bubbles, and T is the volume of bubblesv/2The time taken for the bubble volume to halve.
Table 1 air entraining agent for concrete air entraining Performance test results
As can be seen from the above table, the air entraining agent can produce a certain reduction effect on the concrete strength, and the concrete strength is reduced more significantly when the average diameter of the bubbles (ABD) is larger, as in example 5 in which the average diameter of the air entraining bubbles is the largest, the concrete compressive strength is the smallest, and when the average diameter of the air entraining bubbles is the smallest, the concrete compressive strength is the largest, even higher than that in comparative example 1 in which the air entraining agent is not blended, which also shows that when the average diameter of the air bubbles is smaller, the number of Bubbles (BN) is increased appropriately, which has little influence on the concrete, and the concrete has a harmless pore structure after being hardened. When the bubble volume (V) is larger, the slump, the expansion and the initial air content of the corresponding concrete are larger, which shows that the lubricating effect generated by the air entraining agent during concrete mixing is more sufficient, and the slump, the expansion and the initial air content of the corresponding concrete are the largest when the bubble volume is the largest in example 1. In addition, the time (T) taken when the bubble volume is reduced to halfV/2) When the length is longer, the corresponding slump loss, the corresponding expansion loss and the corresponding gas content loss are smaller, which shows that the air entraining agent has better bubble stability, and the result of blending the air entraining agent in the embodiment 1This is also demonstrated. The results finally show that the test results of the evaluation method are consistent with the results of the gas content test method specified in GB 8076-2008 'concrete admixture', so that the evaluation method has sufficient objectivity.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (9)
1. A testing method for the air entraining performance of an air entraining agent for concrete utilizes a testing device to test, wherein the testing device comprises an oscillator; the method is characterized in that: the test container of the oscillator is a columnar glass container with a graduated upper end opening; the testing device also comprises a bubble image processing system, and a macro lens of the bubble image processing system shoots a foam image of the container wall of the columnar glass container; the bubble image processing system carries out black filling processing on bubbles of the foam image and divides the bubble wall, calculates the number of the bubbles and the average diameter of the bubbles in the area of the shot foam image and displays the number and the average diameter of the bubbles through the display device;
the test method specifically comprises the following steps:
the method comprises the following steps: preparing a simulated cement pore solution, and then adding an air entraining agent to be detected into the simulated cement pore solution to form a liquid to be detected;
step two: filling a certain amount of liquid to be tested into a test container, sealing the test container, and starting a test device to oscillate and foam the test liquid for a preset oscillation time;
step three: and opening the sealing plug after the oscillation is finished, standing for 5 min, then carrying out microspur shooting on a square area preset in the middle position of the bubble, reading the number and average diameter of the bubble imaged and displayed on a display after the bubble is processed by the bubble image processing system, and reducing the volume of the bubble and the time for half of the volume of the bubble of the whole test container.
2. The method for testing the air entraining performance of the air entraining agent for concrete according to claim 1 is characterized in that: the oscillator comprises a square cushion base; a square main machine shell is vertically arranged in the middle of the surface of the base of the buffer pad; a plurality of groups of oscillating structures capable of oscillating up and down are symmetrically arranged on the left side and the right side of the square main machine shell; the left oscillating structure and the right oscillating structure are positioned at two ends of the main case to oscillate left, right and up and down alternately; each oscillating knot comprises a sliding rod, a container clamp and a container fixing base; the sliding rod can vibrate up and down along with the host; the non-gripping end of the container clamp is slidably connected to a surface of a slide bar; the lower end of each clamp is correspondingly provided with a container fixing base; the middle position of each sliding rod is movably connected with a macro lens of the bubble image processing system; the macro lens is connected with a host of the bubble image processing system and the display device through an interface arranged on the surface of the host shell.
3. The method for testing the air entraining performance of the air entraining agent for concrete according to claim 2 is characterized in that:
the oscillating structures on the left side and the right side of the main case are 2-10 groups.
4. The method for testing the air entraining performance of the air entraining agent for concrete according to claim 1 is characterized in that:
the diameter of the test container is 2 cm-50 cm, the height of the test container is 5 cm-100 cm, and the bottle mouth is a frosted mouth.
5. The method for testing the air entraining performance of the air entraining agent for concrete according to claim 1 is characterized in that: in the first step, the concentration of calcium ions in the simulated cement pore solution is 0.001-0.02 mol/L, and the pH value of the solution is 10-14.
6. The method for testing the air entraining performance of the air entraining agent for concrete according to claim 1 is characterized in that: in the second step, the oscillation amplitude of the testing device is 1 to 1000 times/min, and the preset oscillation time of the testing device is 0.5 to 1440 min.
7. The method for testing the air entraining performance of the air entraining agent for concrete according to claim 1 is characterized in that:
in the second step, the test oscillation amplitude is 1-500 times/min, and the test preset oscillation time is 0.5-60 min.
8. The method for testing the air entraining performance of the air entraining agent for concrete according to claim 1 is characterized in that: the solid content of the air entraining agent in the liquid to be detected in the step one is 0.001 g/L-20 g/L.
9. The method for testing the air entraining performance of the air entraining agent for concrete according to claim 1 is characterized in that: the square area in the third step is 1 mm2~50 mm2。
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115308235A (en) * | 2022-08-09 | 2022-11-08 | 山东科技大学 | Air entraining fresh concrete bubble determination and analysis all-in-one machine |
| CN115792194A (en) * | 2022-11-11 | 2023-03-14 | 山东大学 | Device and method for evaluating compatibility and air entraining quality of concrete air entraining agent |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1247173A (en) * | 1998-09-08 | 2000-03-15 | 帅希文 | Application of saponin in concrete |
| JP2009000852A (en) * | 2007-06-20 | 2009-01-08 | Taiheiyo Cement Corp | Device and method for monitoring property of ready-mixed concrete |
| CN103884645A (en) * | 2012-12-24 | 2014-06-25 | 中国制浆造纸研究院 | Method for testing gas content in paint |
| CN103926174A (en) * | 2014-04-02 | 2014-07-16 | 交通运输部公路科学研究所 | Method for evaluating air entraining effect of air entraining agent for cement concrete |
| CN104297455A (en) * | 2014-10-08 | 2015-01-21 | 江苏苏博特新材料股份有限公司 | Prediction method of appearance bubbles of hardened concrete |
| CN104446109A (en) * | 2014-11-12 | 2015-03-25 | 湖南省建筑工程集团总公司 | Concrete air-entraining agent |
| CN107796744A (en) * | 2017-10-17 | 2018-03-13 | 悉地（苏州）勘察设计顾问有限公司 | It is a kind of to be used to test the new device and method for mixing pervious concrete workability |
| CN208420856U (en) * | 2018-07-02 | 2019-01-22 | 重庆大学 | Number of bubbles and number density detection device are blown into a kind of multiphase flow |
| CN211179711U (en) * | 2019-10-18 | 2020-08-04 | 交通运输部公路科学研究所 | Air entraining agent air entraining performance testing device under low-pressure environment |
| CN212282957U (en) * | 2020-03-05 | 2021-01-05 | 山东菁工仪器有限公司 | Vertical oscillator of liquid separation funnel |
| CN112525768A (en) * | 2020-12-25 | 2021-03-19 | 武汉三源特种建材有限责任公司 | Method for detecting defoaming rate of cement base material defoaming agent |
| CN112710782A (en) * | 2020-11-26 | 2021-04-27 | 科之杰新材料集团福建有限公司 | Performance test evaluation method of concrete foam control agent |
| CN112763379A (en) * | 2020-12-24 | 2021-05-07 | 科之杰新材料集团有限公司 | Method for evaluating air entraining performance of concrete admixture |
| CN113144223A (en) * | 2021-03-01 | 2021-07-23 | 北京大学深圳医院 | Two-dimensional material microbubble preparation and two-dimensional material microbubble medicinal liquid |
-
2021
- 2021-10-13 CN CN202111190912.6A patent/CN113804864A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1247173A (en) * | 1998-09-08 | 2000-03-15 | 帅希文 | Application of saponin in concrete |
| JP2009000852A (en) * | 2007-06-20 | 2009-01-08 | Taiheiyo Cement Corp | Device and method for monitoring property of ready-mixed concrete |
| CN103884645A (en) * | 2012-12-24 | 2014-06-25 | 中国制浆造纸研究院 | Method for testing gas content in paint |
| CN103926174A (en) * | 2014-04-02 | 2014-07-16 | 交通运输部公路科学研究所 | Method for evaluating air entraining effect of air entraining agent for cement concrete |
| CN104297455A (en) * | 2014-10-08 | 2015-01-21 | 江苏苏博特新材料股份有限公司 | Prediction method of appearance bubbles of hardened concrete |
| CN104446109A (en) * | 2014-11-12 | 2015-03-25 | 湖南省建筑工程集团总公司 | Concrete air-entraining agent |
| CN107796744A (en) * | 2017-10-17 | 2018-03-13 | 悉地（苏州）勘察设计顾问有限公司 | It is a kind of to be used to test the new device and method for mixing pervious concrete workability |
| CN208420856U (en) * | 2018-07-02 | 2019-01-22 | 重庆大学 | Number of bubbles and number density detection device are blown into a kind of multiphase flow |
| CN211179711U (en) * | 2019-10-18 | 2020-08-04 | 交通运输部公路科学研究所 | Air entraining agent air entraining performance testing device under low-pressure environment |
| CN212282957U (en) * | 2020-03-05 | 2021-01-05 | 山东菁工仪器有限公司 | Vertical oscillator of liquid separation funnel |
| CN112710782A (en) * | 2020-11-26 | 2021-04-27 | 科之杰新材料集团福建有限公司 | Performance test evaluation method of concrete foam control agent |
| CN112763379A (en) * | 2020-12-24 | 2021-05-07 | 科之杰新材料集团有限公司 | Method for evaluating air entraining performance of concrete admixture |
| CN112525768A (en) * | 2020-12-25 | 2021-03-19 | 武汉三源特种建材有限责任公司 | Method for detecting defoaming rate of cement base material defoaming agent |
| CN113144223A (en) * | 2021-03-01 | 2021-07-23 | 北京大学深圳医院 | Two-dimensional material microbubble preparation and two-dimensional material microbubble medicinal liquid |
Non-Patent Citations (2)
| Title |
|---|
| 王海刚;李崇智;: "引气剂对掺聚羧酸系减水剂混凝土的工作性影响", 混凝土世界, no. 01, pages 62 - 65 * |
| 高辉;温延龙;: "引气剂对混凝土气泡结构的影响研究", 粉煤灰综合利用, no. 04, pages 34 - 36 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115308235A (en) * | 2022-08-09 | 2022-11-08 | 山东科技大学 | Air entraining fresh concrete bubble determination and analysis all-in-one machine |
| CN115308235B (en) * | 2022-08-09 | 2024-04-26 | 山东科技大学 | Air entraining fresh concrete bubble determination and analysis integrated machine |
| CN115792194A (en) * | 2022-11-11 | 2023-03-14 | 山东大学 | Device and method for evaluating compatibility and air entraining quality of concrete air entraining agent |
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