CN103994968A - Test method for coating construction performance - Google Patents
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- CN103994968A CN103994968A CN201410097695.XA CN201410097695A CN103994968A CN 103994968 A CN103994968 A CN 103994968A CN 201410097695 A CN201410097695 A CN 201410097695A CN 103994968 A CN103994968 A CN 103994968A
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Abstract
The invention discloses a test method for coating construction performance. Specifically, the method tests the levels of forces applied by a constructor (good or bad construction handle) in the coating construction of different materials, so as to determine construction handle and the degree of difficulty for construction of the material, and provide corresponding quantitative parameters and basis for material research and improvement.
Description
Technical field
The present invention relates to coating application field, particularly, the invention provides a kind of method of testing of coating decoration feel.
Background technology
The various functions of coating, general have relevant national standard or the industry standard can reference, but the workability of coating products, the complexity of the feel of especially constructing and construction, but lack relevant examination criteria and can quantize reference frame, causing there are many products on market, although there is excellent film performance, but because constructional difficulties, waste time and energy, be difficult to be accepted by market.
Generally, whether easily workmen can weigh the construction of a kind of material with the weight of construction feel, difference due to individual sensory difference and construction custom, be difficult to judge accurately the complexity of product painting construction, different workmens' conclusion also often varies, and is difficult to obtain quantifiable indicator and parameter.
The test that the method for testing of a Chinese patent 201110039178.3 < < coating construction performance and device > > are coating decoration provides a fast simple method and device.Yet, find that in practice the method and device in actual use, exist data fluctuations larger, human factor impact is larger, and several problems such as Data duplication is poor.
In sum, it is good that this area still lacks a kind of Data duplication, can effectively react the coating decoration method of testing of coating decoration complexity.
Summary of the invention
The object of this invention is to provide a kind of Data duplication good, can effectively react the coating decoration method of testing of coating decoration complexity.
A first aspect of the present invention, provides a kind of method of testing of coating construction performance, and described method comprises step:
(1) provide a coating construction performance proving installation, described device comprises a test panel, and one or more with described test panel is connected, for the force-measuring sensing device that is subject to force information of collecting test panel; Wherein, described test panel has a first type surface for applying;
(2) with clear water, on described test panel, brush, and collecting test panel be subject to force information F
water;
(3) with coating material to be measured, on described test panel, brush, and collecting test panel be subject to force information F
sample;
(4) according to F
sampleand F
waternumerical value, judge the coating construction performance of coating material to be measured.
In another preference, described test panel is transportable test panel panel.
In another preference, the above and below of described test panel is all provided with guide rail.
In another preference, described test panel comprises a backboard and a capable replacing faceplate, and wherein, described capable replacing faceplate is fixed on described backboard, and is positioned at the first type surface of described test panel.
In another preference, on described backboard, also there is a draw-in groove, and described draw-in groove is for fixing described capable replacing faceplate.
In another preference, described capable replacing faceplate is selected from lower group: plasterboard, cardboard, PVC plate, or its combination.
In another preference, described coating material to be measured is selected from lower group: interior exterior wall latex paint, woodcare paint, paint, putty, water-repellent paint, mortar.
In another preference, in described step (3), described painting brush finger is brushed according to the construction reference of coating material to be measured.
In another preference, the brushing in described step (2) and step (3) is carried out on described capable replacing faceplate.
In another preference, described method comprises: according to F
sampleand F
waterthe ratio A of numerical value, judge the coating construction performance of coating material to be measured.
In another preference, described method also comprises: A value is larger, shows that the application property of described coating material to be measured is poorer.
In another preference, when described coating material to be measured is interiro wall latex paint, described method also comprises: when A value is during at 1.2-1.5, the coating construction performance of described coating material to be measured is suitable; Otherwise for being not suitable for.
In another preference, when described coating material to be measured is waterproof material, described method also comprises: when A value is during at 2.0-2.5, the coating construction performance of described coating material to be measured is suitable; Otherwise for being not suitable for.
In another preference, described F
samplewhen brushing coating material to be measured, the average force value of test panel; And
Described F
waterduring for brushing clear water, the average force value of test panel;
The mean value of the stress value that wherein, described average force value collects for each force-measuring sensing device.
In another preference, described test panel is connected with 2-20 force-measuring sensing device, is preferably connected with 4-15 force-measuring sensing device, is more preferably connected with 6-12 force-measuring sensing device.
In another preference, described force-measuring sensing device is High Precision Strength Measurement Sensor.
In another preference, described proving installation also comprises:
Data analysis system, described data analysis system is for analyzing the force information that is subject to of described force-measuring sensing device collection; And/or
Data acquisition system (DAS), described data acquisition system (DAS) is for storing the force information that is subject to of described force-measuring sensing device collection.
In another preference, in described proving installation, described force-measuring sensing device is connected with the back side of test panel first type surface.
In another preference, described a plurality of force-measuring sensing devices are evenly distributed on test panel.
In another preference, the position of described a plurality of force-measuring sensing devices equates with the distance between test panel first type surface.
In another preference, described first type surface is smooth or substantially smooth.
In another preference, described proving installation also comprises sensor stand, and described sensor stand is used for fixedly force-measuring sensing device.
In another preference, in described proving installation, each sensor is equipped with a sensor stand.
In another preference, in described proving installation, part or all of sensor stand is one.
In another preference, in described proving installation, described part or all of sensor stand is fixed on ground or wall.
In another preference, described proving installation also comprises fine setting feeler lever, described fine setting feeler lever for regulate sensor and test panel between effective contact area.
In another preference, in described proving installation, each sensor is all equipped with a fine setting feeler lever.
A second aspect of the present invention, provides a kind of proving installation of coating construction performance, and described proving installation comprises:
One test panel, wherein, described test panel has a first type surface for applying;
A plurality of force-measuring sensing devices; Described force-measuring sensing device is connected with described test panel, for the force information that is subject to of collecting test panel; Preferably, the force-measuring sensing device described in each has one for the fixing sensor stand of force-measuring sensing device;
Fine setting feeler lever, described fine setting feeler lever for regulate sensor and test panel between effective contact area;
Data analysis system, described data analysis system is for analyzing the force information that is subject to of described force-measuring sensing device collection; With
Data acquisition system (DAS), described data acquisition system (DAS) is for storing the force information that is subject to of described force-measuring sensing device collection.
In another preference, described device also comprises high-frequency data acquisition tables, the data that arrive for collecting test.
In another preference, the stressed information that described force-measuring sensing device is collected comprises: while brushing on described test panel with clear water, test panel is subject to force information F
water; While brushing on described test panel with coating material to be measured, test panel is subject to force information F
sample.
In another preference, described test panel is connected with 2-20 force-measuring sensing device, is preferably connected with 4-15 force-measuring sensing device, is more preferably connected with 6-12 force-measuring sensing device.
In another preference, described force-measuring sensing device is High Precision Strength Measurement Sensor.
In another preference, in described proving installation, all the sensors support is one.
In another preference, described test panel is transportable test panel panel.
In another preference, the above and below of described test panel is all provided with guide rail.
In another preference, described test panel comprises a backboard and a capable replacing faceplate, and wherein, described capable replacing faceplate is fixed on described backboard, and is positioned at the first type surface of described test panel.
In another preference, on described backboard, also there is a draw-in groove, and described draw-in groove is for fixing described capable replacing faceplate.
In another preference, described capable replacing faceplate is to be selected from the panel of lower group: plasterboard, cardboard, PVC plate, or its combination.
In should be understood that within the scope of the present invention, above-mentioned each technical characterictic of the present invention and can combining mutually between specifically described each technical characterictic in below (eg embodiment), thus form new or preferred technical scheme.As space is limited, at this, tire out and state no longer one by one.
Accompanying drawing explanation
Fig. 1 is the coating decoration hand feeling testing device schematic diagram in preference of the present invention;
Fig. 2 is the distribution schematic diagram of force-measuring sensing device on test panel in preference of the present invention.
Embodiment
The inventor, through long-term and deep research, has studied a kind of Data duplication good first, can effectively react the coating construction performance method of testing of coating decoration complexity.Described method can be got rid of the impact of test condition to greatest extent, obtain representative coating construction performance quantization signifying data, and data have general significance of application, thereby the complexity that has effectively solved construction feel and construction is difficult to detect and the problem of quantification.
Term
As used herein, term " coating decoration feel ", " coating construction performance ", " coating decoration " are used interchangeably, the complexity while all referring to build coating material brushing construction.
Coating construction performance proving installation
A proving installation for coating construction performance, is characterized in that, described proving installation comprises:
One test panel, wherein, described test panel has a first type surface for applying;
A plurality of force-measuring sensing devices; Described force-measuring sensing device is connected with described test panel, for the force information that is subject to of collecting test panel;
Fine setting feeler lever, described fine setting feeler lever for regulate sensor and test panel between effective contact area;
Data analysis system, described data analysis system is for analyzing the force information that is subject to of described force-measuring sensing device collection; With
Data acquisition system (DAS), described data acquisition system (DAS) is for storing the force information that is subject to of described force-measuring sensing device collection.
In another preference, described device also comprises high-frequency data acquisition tables, the data that arrive for collecting test.
Preferably, described test panel comprises a backboard and a capable replacing faceplate, and wherein, described capable replacing faceplate is fixed on described backboard, and is positioned at the first type surface of described test panel.In test process, described being coated on described capable replacing faceplate carried out, and after coating finishes, described capable replacing faceplate changed into the new capable replacing faceplate of uncoated.
In another preference, described first type surface is smooth or substantially smooth.
In another preference, on described backboard, also there is a draw-in groove, for fixing described capable replacing faceplate.
Described capable replacing faceplate can be this area routine for construction simulation state, meet water and can not be out of shape or wrinkling panel after moistening, plasterboard for example, (through or not surface treated) sheet metal, cardboard, PVC plate etc.
In another preference, described test panel is movably, preferably for can vertically move the test panel of (moving forward and backward) in same direction.Preferably, the top and bottom of described test panel are all provided with guide rail, to guarantee still to keep stressed even after test panel moves.
Described test panel can as 2-20 force-measuring sensing device is connected, preferably be connected with 4-15 force-measuring sensing device with a plurality of, is more preferably connected with 6-12 force-measuring sensing device.In another preference, described force-measuring sensing device is High Precision Strength Measurement Sensor.
Under a kind of preferable case of the present invention, in described proving installation, described force-measuring sensing device is positioned at the back side or the Embedded test panel of test panel first type surface, to farthest reduce the stress of test panel.In preferred situation, described a plurality of force-measuring sensing devices are evenly distributed on test panel.In another preference, the position of described a plurality of force-measuring sensing devices equates with the distance between test panel first type surface.
Size and the weight of panel have no particular limits, and in another preference, the whole deadweight of described test panel is light (about 12kg), to guarantee that force-measuring sensing device reacts the stressing conditions of first type surface as far as possible exactly.
Described proving installation can also comprise sensor stand, and described sensor stand is used for fixedly force-measuring sensing device.In another preference, in described proving installation, each sensor is equipped with a sensor stand.
Preferably, part or all of sensor stand is one, and being preferably all the sensors support is one, to keep force-measuring sensing device in test process not relatively move, guarantees that systematic error does not appear in force-measuring sensing device in test process.
In another preference, in described proving installation, each described sensor stand is partly or entirely fixed on ground or wall.So that it is mobile that fixation of sensor is difficult for it, guarantee to measure accurate.
In another preference, described proving installation also comprises fine setting feeler lever, described fine setting feeler lever for regulate sensor and test panel between effective contact area, avoid the inductor can not be normally stressed, prevent dynamometry error, guarantee to measure accurate.
Described fine setting feeler lever can adopt manual adjustment mode, or adopts electronic intelligence regulative mode.Preferably, when adopting a plurality of force cell, by predefined program, regulate simultaneously, when starting fine setting, once sensor touches test panel, automatically stop fine setting at once, the balance fine setting for a plurality of sensors, brings great convenience.
Described data analysis system is for analyzing the force information that is subject to of described force-measuring sensing device collection; Described data acquisition system (DAS) is for storing the force information that is subject to of described force-measuring sensing device collection, and in preference of the present invention, described data analysis system can be computing machine.
In another preference, described device also comprises high-frequency data acquisition tables, the data that arrive for collecting test.High-frequency data acquisition tables is a kind of electronic instrument, and for the data of collecting test process, final manifestation mode, can according to demand, show with forms such as form, curve, figures.
Coating construction performance method of testing
The coating construction performance method of testing that the invention provides a kind of coating material, described method comprises step:
(1) provide a coating construction performance proving installation, described device comprises a test panel, and one or more with described test panel is connected, for the force-measuring sensing device that is subject to force information of collecting test panel; Wherein, described test panel has a first type surface for applying;
(2) with clear water, on described test panel, brush, and collecting test panel be subject to force information F
water;
(3) with coating material to be measured, on described test panel, brush, and collecting test panel be subject to force information F
sample;
(4) according to F
sampleand F
waternumerical value, judge the coating construction performance of coating material to be measured.
Wherein, in step (3), described brushing is carried out according to the construction reference of coating material to be measured.
The performance of coating material to be measured can be passed through F
sampleand F
waterthereby numerical value compare judgement, or carry out the numerical value of data processing to obtain quantizing.Preferably, described method comprises: according to F
sampleand F
waterthe ratio A of numerical value, judge the coating construction performance of coating material to be measured.
In a preference of the present invention, when A value is larger, show that the application property of sample is poorer.In another preference of the present invention, coating material for particular type, the A value of coating decoration feel has a suitable scope, for example, in another preference, when described coating material to be measured is interiro wall latex paint, described method also comprises: when A value is during at 1.2-1.5, the coating construction performance of described coating material to be measured is suitable; Otherwise for being not suitable for.In another preference, when described coating material to be measured is waterproof material, described method also comprises: when A value is during at 2.0-2.5, the coating construction performance of described coating material to be measured is suitable; Otherwise for being not suitable for.
Under identical execution conditions, F
sampleand F
watercan be by conventional stressing conditions numeric representation mode, a kind of preferred expression mode is average force value, that is, and described F
samplewhen brushing coating material to be measured, the average force value of test panel; And described F
waterduring for brushing clear water, the average force value of test panel; The mean value of the stress value that wherein, described average force value collects for each force-measuring sensing device.
By method of the present invention, can measure the coating construction performance of a series of coating material, such as (but being not limited to), be selected from the coating material of lower group: interior exterior wall latex paint, woodcare paint, paint, putty, water-repellent paint, mortar etc.
In the present invention, a kind of preferred method of testing is as follows:
Method of testing:
1, test panel need keep surface clean, smooth, adjusts sensor to contact point;
2, log-on data acquisition system, proofreaies and correct testing sensor and makes zero, and message transmission rate is set;
3,, on test panel, use clear water to simulate brushing, the relevant construction stress data of record;
4, on test panel, testing sample construction method is in accordance with regulations carried out to coating decoration, the relevant construction stress data of record;
5, in work progress, workmen's firmly situation is transferred to test panel by coating tool, again by force cell and the data acquisition table at the test panel back side, these communications, to data acquisition system (DAS), are recorded to different construction areas and the force data of time in work progress automatically by this system;
The data that data analysis system obtains the data acquisition system (DAS) of different engineering times are carried out computing and analysis, and the data in the whole work progresss such as maximal value, minimum value, mean value are calculated automatically, also can carry out hand computation by following formula;
The calculating of construction feel: A=F
sample/ F
water
A---construction feel parameter
F
sample---the average force value of brushing testing sample
F
water---the average force value of brushing clear water
Average construction calculating firmly: F=(F
1'+F
2'+F
3' ... + F
n')/n
F
1'---the average force value of No. 1 force-detecting position
F
2'---the average force value of No. 2 force-detecting positions
F
3'---the average force value of No. 3 force-detecting positions
F
n'---the average force value of n force-detecting position
N---the quantity of total force-detecting position
The computing method of single force-detecting position average force value: F
1'=(f
1+ f
2+ f
3+ f
a)/a
F
1---the 1st stress value on this force-detecting position
F
2---the 2nd stress value on this force-detecting position
F
3---the 3rd stress value on this force-detecting position
F
a---last 1 stress value on this force-detecting position
A---the stress value quantity that this force-detecting position is total
Result judgement:
A value is larger, shows that the construction feel of sample is poorer, and construction is firmly large, and construction is painstaking, and the application property of this sample is also just poorer.
In former Chinese patent 201110039178.3 methods, adopt operating efficiency and construction size firmly, as judging basis; For same workmen, data have certain reference significance, but for different workmens, the reference significance of data is little.Because different constructions is artificial, the trick speed of working itself just varies with each individual, and construction proficiency also varies with each individual, and the workman that handicraft is good, even if the sample of more difficult construction also can be coated with and brush very soon; And the workman that handicraft is poor or natural disposition is slow, even if hold easy working sample, also will spend the relatively long time to be coated with and brush, cause the operating efficiency that calculates very low; , also there is same problem in construction numerical value firmly, has the born power of people large, no matter what product of brushing all can use very large power, and has the little or construction technique of the born power of people to grasp, and constructs howsoever, and the power of use is all little.
For fear of the problems referred to above, must get rid of the impact of above-mentioned factor, therefore, in test process, before each test, increase the brushing data test of clear water, during calculating, average the exerting oneself during by brushing sample, average the exerting oneself during divided by brushing clear water, the numerical value obtaining, i.e. the basis for estimation of conduct construction feel; Adopt after the method, the error that can effectively avoid different human factors to cause, the manual feel numerical value calculating, no matter be same personnel or different personnel, all possesses certain correlativity and reference significance.
Test result shows, for specific product, A value has certain scope, and for example, the A value that general interiro wall latex paint test obtains is roughly about 1.2-1.5, and water-repellent paint can reach 2.0-2.5.This shows that the application's method can show the character of coating material itself well.
Major advantage of the present invention comprises:
(1) the inventive method has been got rid of the impact of the uncertain factors such as test condition and tester to greatest extent, and test data is reproducible, can effectively react coating decoration complexity.
(2) method of testing of the present invention is simple, and can be applied to most of coating materials, applied widely, is suitable as general coating material evaluation criterion.
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment are only not used in and limit the scope of the invention for the present invention is described.The experimental technique of unreceipted actual conditions in the following example, conventionally according to normal condition, or the condition of advising according to manufacturer.Unless otherwise indicated, otherwise number percent and umber calculate by weight.
The coating performance test of embodiment 1 interiro wall latex paint
1, set 9 data collection points, and be evenly distributed on 2 square metres of big or small test panels, to guarantee to test the stressing conditions of different parts;
2, by the message transmission rate of data collection point for being set as 100 times/second, and confirm that data acquisition unit contacts and normal operation with test panel;
3, turn-on data acquisition system, starts construction simulation action on test panel, and whether test macro running is normal, debugs the record of test curve and data simultaneously, guarantees to record accurate;
4, on test panel, use clear water to simulate brushing, setting data acquisition system gathers and analyzes the data of 9 points respectively;
5, interiro wall latex paint to be measured is diluted in proportion and stirred;
6, start to carry out roller coating construction on test panel surface;
7, setting data acquisition system gathers and analyzes the data of 9 points respectively;
8, data processing and analysis:
By 2 different workmens of first, second brush respectively A B tri-samples of C, test data record is as follows:
According to original appraisal procedure, the average firmly size of value of operating efficiency (construction used time) or construction is passed judgment on the quality of sample construction feel,, according to above data, during workmen's first brushing A sample, be firmly less than workmen's second, and operating efficiency (construction used time) is greater than workmen's second, according to passing judgment on rule, exert oneself little or the used time is few, belong to construction good hand touch, and two situations that data are contrary have appearred in reality, cannot pass judgment on; If assess for different products, can run into Similar Problems equally.Because operating efficiency (construction used time) cannot be carried out quantitative evaluation to different personnel's construction proficiency, and be easily subject to some such as the impact of the factors such as natural disposition trick speed, therefore, the operating efficiency data reference value that actual test obtains is also little, easily cause on the contrary misleading, in the method, do not adopt these data as judging basis.
The condition of construction data recording of the inventive method is as follows.Before construction, each workmen increases brushing clear water, as reference, calculates construction feel parameter A, and result of calculation is as follows:
From above-mentioned result of calculation, can see, for 3 different samples, 2 different workmens, although construction firmly has obvious difference, also there is notable difference the construction used time, but the construction feel parameter A calculating approaching very, can effectively get rid of different workmens' impact, thereby characterize comparatively exactly the performance of coating material itself.
After retrofit testing and evaluation method, obviously reduced the impact of human factor, evaluation method is also more simple and clear.
The coating performance test of embodiment 2 different coating
Adopt method as identical in embodiment 1, tested respectively different coating materials, as latex paint, waterproof mortar, water-repellent paint, oil paint etc., also allow the workmen of different proficiencys test respectively, the construction feel parameter A calculating, for identical product, is substantially all stable, illustrate that this method of testing can react the character of coating itself, there is using value.
Visible, utilize the method and device can realize the fast and convenient quality of judging decorations coating material (as coating, mortar, putty etc.) construction feel, and testing result is not subject to the impact of the factors such as workmen's individual factor, execution conditions, thereby quantifiable reference data is provided, has realized original intention of the present invention.And the method is not subject to the restriction of coating material type, can be applied to multiple coating material.
All documents of mentioning in the present invention are all quoted as a reference in this application, just as each piece of document, are quoted as a reference separately.In addition should be understood that those skilled in the art can make various changes or modifications the present invention after having read above-mentioned instruction content of the present invention, these equivalent form of values fall within the application's appended claims limited range equally.
Claims (10)
1. a method of testing for coating construction performance, is characterized in that, described method comprises step:
(1) provide a coating construction performance proving installation, described device comprises a test panel, and one or more with described test panel is connected, for the force-measuring sensing device that is subject to force information of collecting test panel; Wherein, described test panel has a first type surface for applying;
(2) with clear water, on described test panel, brush, and collecting test panel be subject to force information F
water;
(3) with coating material to be measured, on described test panel, brush, and collecting test panel be subject to force information F
sample;
(4) according to F
sampleand F
waternumerical value, judge the coating construction performance of coating material to be measured.
2. method of testing as claimed in claim 1, is characterized in that, described method comprises: according to F
sampleand F
waterthe ratio A of numerical value, judge the coating construction performance of coating material to be measured.
3. method of testing as claimed in claim 2, is characterized in that, described method also comprises: A value is larger, shows that the application property of described coating material to be measured is poorer.
4. method of testing as claimed in claim 1, is characterized in that,
Described F
samplewhen brushing coating material to be measured, the average force value of test panel; And
Described F
waterduring for brushing clear water, the average force value of test panel;
The mean value of the stress value that wherein, described average force value collects for each force-measuring sensing device.
5. method of testing as claimed in claim 1, is characterized in that, described test panel is connected with 2-20 force-measuring sensing device, is preferably connected with 4-15 force-measuring sensing device, is more preferably connected with 6-12 force-measuring sensing device.
6. method of testing as claimed in claim 1, is characterized in that, described proving installation also comprises:
Data analysis system, described data analysis system is for analyzing the force information that is subject to of described force-measuring sensing device collection; And/or
Data acquisition system (DAS), described data acquisition system (DAS) is for storing the force information that is subject to of described force-measuring sensing device collection.
7. method of testing as claimed in claim 1, is characterized in that, in described proving installation, described force-measuring sensing device is connected with the back side of test panel first type surface.
8. method of testing as claimed in claim 1, is characterized in that, described proving installation also comprises sensor stand, and described sensor stand is used for fixedly force-measuring sensing device.
9. method of testing as claimed in claim 1, is characterized in that, described proving installation also comprises fine setting feeler lever, described fine setting feeler lever for regulate sensor and test panel between effective contact area.
10. a proving installation for coating construction performance, is characterized in that, described proving installation comprises:
One test panel, wherein, described test panel has a first type surface for applying;
A plurality of force-measuring sensing devices; Described force-measuring sensing device is connected with described test panel, for the force information that is subject to of collecting test panel; Preferably, the force-measuring sensing device described in each has one for the fixing sensor stand of force-measuring sensing device;
Fine setting feeler lever, described fine setting feeler lever for regulate sensor and test panel between effective contact area;
Data analysis system, described data analysis system is for analyzing the force information that is subject to of described force-measuring sensing device collection; With
Data acquisition system (DAS), described data acquisition system (DAS) is for storing the force information that is subject to of described force-measuring sensing device collection.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110736826A (en) * | 2019-11-27 | 2020-01-31 | 北京金隅砂浆有限公司 | mortar construction performance testing device and testing method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110736826A (en) * | 2019-11-27 | 2020-01-31 | 北京金隅砂浆有限公司 | mortar construction performance testing device and testing method |
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