CN109408835B - Wall putty construction rheological parameter range determination method - Google Patents
Wall putty construction rheological parameter range determination method Download PDFInfo
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- CN109408835B CN109408835B CN201710697342.7A CN201710697342A CN109408835B CN 109408835 B CN109408835 B CN 109408835B CN 201710697342 A CN201710697342 A CN 201710697342A CN 109408835 B CN109408835 B CN 109408835B
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Abstract
The invention discloses a method for measuring a construction rheological parameter range of wall putty, which comprises the following steps: determining rheological parameters of a plurality of putty samples, manually scoring the construction performance of each putty sample, and determining the rheological parameter range of the putty sample with the construction performance reaching the standard according to the scoring value of each putty sample; the method for measuring the rheological parameter range of putty construction is favorable for guiding the adjustment work of the formula of the putty product from the microstructure, provides the rheological parameter range of the putty product with qualified construction hand feeling, and can be used as a quality control index of the putty product to replace a subjective scoring method to a certain extent.
Description
Technical Field
The invention relates to the field of engineering materials, in particular to a method for measuring a construction rheological parameter range of wall putty.
Background
At present, the wall putty is mainly constructed by an experienced constructor through scraping by means of a scraping knife and a putty knife. When developing or improving interior wall putty powder and putty paste products, the formula and process adjustment for optimizing the workability are mainly based on the fact that experienced constructors simulate site construction, and then score a plurality of workability indexes item by item. And the formula design engineer adjusts the formula according to the grading result. In the construction performance scoring project, the batch scraping hand feeling is the most important factor for determining the scoring level. The grading result of the constructor on the scraping hand feeling is greatly affected by artificial subjective factors, and the grading results given by different people and even the same person at different times can be inconsistent. This uncertainty in scoring results due to subjective human factor inconsistencies greatly interferes with the development of product formulas. Meanwhile, in the aspect of controlling the quality stability of the factory products, a set of objective and reliable technical indexes is also needed to measure the scraping hand feeling of the putty products.
The construction performance evaluation method and the actual construction condition of putty products in the building industry standard are greatly different. The putty for the JG/T298-2010 building inner wall and the putty for the JG/T157-2009 building outer wall are both 'obstacle' or 'no obstacle' for construction description, and the subjective components are large in judgment and have no digital parameter limit standard. At present, the construction hand feeling evaluation of putty products in factory inspection is also a subjective scoring method for the real hand feeling of putty batch scraping process by means of deep constructors. Although the quantitative method can be used for quantification, the number used for quantification is derived from subjective feeling, and the score is difficult to directly correlate with the formula composition, so that an objective quantitative index capable of correlating the formula, the process and the actual workability is needed, and the quantitative index and the actual workability are corresponding. In evaluating the workability of the putty, it is most important that the constructor feel during the scraping process. The quantitative research on the batched hand feeling of putty mainly starts from the rheological property of materials, and the construction performance of the putty is evaluated by taking the inherent rheological parameter of the materials as an index. Rheological parameters in terms of sample fluidity, plasticity and the like can be obtained by means of a rotary rheometer, a rotary viscometer, a puncture depth meter, a consistometer, a diving table and the like. For example, the domestic construction putty industry evaluates the performance of putty in terms of consistency (GB/T1749), and the North America and European construction materials industries typically use a diving desk (Belgium standard NBN B13-206) and an Amili plastometer U.S. Emley Plasticity Meter (U.S. ASTM C110-04.7) to measure the performance of construction.
Both standard consistometer and diving desk test methods are to examine the static yield stress of the material from rest to before flowing, which is not exactly the same as the rapid spreading process of actual putty or mortar in a batch scraping process. The putty is semi-solid and has strong thixotropic property. Some samples have a large consistency value measured by a consistometer, but the hand feeling is good, so that the use of the consistency value as a single evaluation index may mislead the formula adjustment. In addition, the measurement results of the two simple instruments are greatly influenced by operators, and the comparability between data obtained by different operators is poor.
Aiming at the structural characteristics of fine filler of the surface putty, the invention obtains good repeatability and reproducibility data while objectively reflecting the touch feeling of the putty batch by means of a high-precision rotary rheometer, and determines the rheological parameter range suitable for formula development and quality control according to a large amount of data.
The present invention has been made in view of this.
Disclosure of Invention
The invention aims to solve the technical problems of overcoming the defects of the prior art, and provides a method for measuring the construction rheological parameter range of the wall putty, which guides the adjustment work of the formula of the putty product from the basis of a microstructure, provides the rheological parameter range of the putty product with qualified construction hand feeling, and can be used as a quality control index of the putty product to replace a subjective scoring method to a certain extent.
In order to solve the technical problems, the basic conception of the technical scheme adopted by the invention is as follows:
a wall putty construction rheological parameter range measuring method comprises the following steps: and (3) measuring rheological parameters of a plurality of putty samples, manually scoring the workability of each putty sample, and determining the rheological parameter range of the putty sample with the workability reaching the standard according to the scoring value of each putty sample.
In the scheme, the acquisition of the rheological parameter range with the up-to-standard construction performance of the putty is based on manual scoring, the accuracy of the rheological parameter range with the up-to-standard construction performance of the putty can be improved by scoring the putty sample by a deep constructor, and although the method is based on manual scoring, a method for marking the construction performance of the putty is provided more objectively, and the construction performance of the putty is marked by the form (rheological parameter) of data. If the constructor is always used for judging the construction performance, the judgment result is easily influenced by personal subjective factors, and the grading results given by different persons and even the same person at different times are possibly inconsistent, so that the uncertainty of the grading result caused by the inconsistent subjective human factors greatly interferes with the development work of a product formula, and in the aspect of controlling the quality stability of a factory product, a set of objective and reliable technical indexes are also needed to measure the batch scraping hand feeling of the putty product. The construction performance of the putty product can be judged according to the relation between the rheological parameter of the putty product and the rheological parameter range of the putty construction performance reaching the standard, which is determined by the method, and is favorable for objective and unified quality management of factories.
Preferably, the rheological parameters of the putty sample comprise two parameters of yield stress and plastic viscosity, and the parameter range of the yield stress and plastic viscosity of each putty sample with the scoring value higher than the set value is used as the rheological parameter range of the putty with the qualified workability.
Preferably, the rheological parameter range of the putty sample for determining the construction performance to reach the standard comprises: establishing a two-dimensional coordinate system by taking yield stress and plastic viscosity as X-Y coordinate axis variables, drawing rheological parameter information of each putty sample in the two-dimensional coordinate system, and selecting a range of each data point which is divided into a plurality of data points higher than a set value in a plane of the two-dimensional coordinate system to obtain a rheological parameter range of which the construction performance of the putty meets the standard;
or, the rheological parameter range of the putty sample for determining the construction performance to reach the standard comprises: and respectively establishing a three-dimensional coordinate system by using yield stress, plastic viscosity and manual scoring as X-Y-Z coordinate axis variables, drawing three variable data of each putty sample in the three-dimensional coordinate system, selecting each putty sample with the manual scoring higher than a set value in a Z axis to project to an X-Y plane, and selecting the range of each data point projected on the X-Y plane to obtain the rheological parameter range with the construction performance reaching the standard.
Preferably, the rheological parameter range of the putty reaching the standard in construction performance is obtained by adopting a rectangular frame to select each data point with the score higher than a set value in an X-Y plane, or is a selected range obtained by sequentially connecting lines to each boundary point of each data point set with the score higher than the set value in the X-Y plane.
In the scheme, the selection range of the irregular pattern shape is obtained by sequentially connecting the lines with the boundary points of each data point set with the score higher than the set value in the X-Y plane, and the selection range of the irregular pattern is more accurate.
Preferably, the rheological parameter range of the putty reaching the standard in construction performance comprises a first rheological parameter range of selecting all data points which are manually scored higher than a set value in an X-Y plane and a second rheological parameter range of further selecting a region with densely distributed data points in the first rheological parameter range.
In the scheme, the design of the putty component formula is guided by selecting the smaller parameter range with densely distributed data points in the first rheological parameter range in the larger range, the putty is allocated to the second rheological parameter range, so that the construction performance of the putty product can be ensured, and when the rheological parameter of the putty product falls into the second rheological parameter range, the probability that the construction performance of the putty product reaches the standard can be increased.
Preferably, after the rheological parameter range of the putty sample with the qualified workability is determined, the method further comprises the process of correcting the rheological parameter range.
In the scheme, the rheological parameter range reaching the standard of the putty construction performance is obtained by testing the limited putty samples, so that in order to improve the accuracy of the rheological parameter range reaching the standard of the putty construction performance, the testing of more putty samples can be continued in the subsequent process, and more accurate results are obtained.
Preferably, the workability of the putty sample comprises a scratch hand during construction;
preferably, the highest score is set for the construction performance of the putty sample, and the rheological parameter range of each putty sample with the construction performance score of more than 70 percent of the highest score is obtained and is the rheological parameter range of the putty with the construction performance reaching the standard.
Preferably, determining the rheological parameters of the putty sample comprises the steps of:
s1, sample pretreatment: adding water into the putty sample according to a specified proportion, uniformly stirring and standing for 5 minutes to form putty paste; step S2, directly entering a putty sample into the step without sample pretreatment;
it should be noted that the putty sample may be putty powder or putty paste, when the putty sample is selected from putty powder, water is added according to a specified proportion, and the mixture is stirred uniformly and kept still for 5 minutes to form the putty paste; and when the putty sample is putty paste, directly entering step S2.
S2, sampling and loading samples to the putty paste according to the sampling requirement of a rotary rheometer: spreading putty paste with specified quality in a parallel plate test system of a rotary rheometer by using a knife, controlling the putty paste to be spread on a lower plate through extrusion of an upper plate, and contacting with the edge of the lower plate but not forming extrusion;
s3, rheological test: after the sample putty paste is stationary for 2min, testing is started, and the first stage is sequentially executed: the shear rate increases linearly from zero to the specified shear rate end, the second phase: the shear rate is reduced to zero from the designated shear rate, torque and rotation speed signals are acquired at intervals of delta t in each stage, and corresponding shear stress-shear rate data points are calculated and output;
and S4, performing linear fitting treatment on the shear stress-shear rate data points obtained in the step S3 to obtain the yield stress and the plastic viscosity of the putty sample.
Preferably, in step S4, a Bingham model is used to perform a linear fitting process, the fitting shear rate is reduced from a specified shear rate to a zero shear stress-shear rate effective data point, and the obtained intercept and slope are the yield stress and plastic viscosity of the corresponding putty sample, respectively;
preferably, the effective data point is that the shear rate is not less than 2s -1 All data points of the range.
Preferably, in step S3, the specified shear rate has a maximum value of 10 to 500 seconds -1 Any value in the range, the shearing time of each stage is any value in 0-60 s, and the thickness of the putty sample is 0.5-2 mm.
The inventors have proved in a large number of experiments that when the maximum shear rate is too low or too high, the shear time is too short or too long, the obtained data cannot reflect the workability, and the data fluctuation is severe when the shear rate is too high, and the repeatability of the plastic viscosity and yield stress data obtained by fitting with a flow model is poor. In order to reduce fluctuation and improve data repeatability, the lower plate of the parallel plate of the rotary rheometer is used for limiting edge breakage of a putty sample under high-speed shearing and can help to achieve the purposes of reducing fluctuation and improving data repeatability.
By adopting the technical scheme, the invention has the following beneficial effects:
1. the method for measuring the rheological parameter range of putty construction is favorable for guiding the adjustment work of the formula of the putty product from the microstructure, provides the rheological parameter range of the putty product with qualified construction hand feeling, and can be used as a quality control index of the putty product to replace a subjective scoring method to a certain extent.
2. In the prior art, in the testing process of putty samples, under the high shear rate, the data acquired by a testing device commonly used in the industry has the defects of serious fluctuation, low fitting index, poor repeatability and the like.
3. The rheological parameter range of the putty sample with the construction performance reaching the standard is determined by the invention, which comprises the following steps: the method comprises the steps of respectively establishing a three-dimensional coordinate system by using yield stress, plastic viscosity and manual scoring as X-Y-Z coordinate axis variables, drawing three variable data of each putty sample in the three-dimensional coordinate system, selecting each putty sample with the manual scoring higher than a set value in a Z axis to project to an X-Y plane, carrying out range selection on each data point projected on the X-Y plane to obtain a rheological parameter range with the qualified workability of the putty, wherein the rheological parameter range with the qualified workability is a plane area, wherein the rheological parameter range with the qualified workability can be obtained by adopting a rectangular frame to select each data point with the scoring higher than the set value in the X-Y plane, or the selection range obtained by sequentially connecting lines to each boundary point with each data point set with the scoring higher than the set value in the X-Y plane is obtained by sequentially connecting lines to each boundary point with each data point set with the scoring higher than the set value in the X-Y plane, and the selection range of irregular graph is obtained by sequentially connecting lines.
The following describes the embodiments of the present invention in further detail with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiments of the invention and together with the description serve to explain the invention, without limitation to the invention. It is evident that the drawings in the following description are only examples, from which other drawings can be obtained by a person skilled in the art without the inventive effort. In the drawings:
FIG. 1 is a schematic diagram of establishing three-dimensional coordinates in an embodiment;
fig. 2 is a schematic view of rheological parameter range selection.
It should be noted that these drawings and the written description are not intended to limit the scope of the inventive concept in any way, but to illustrate the inventive concept to those skilled in the art by referring to the specific embodiments.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions in the embodiments will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention, and the following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
Example 1
The embodiment provides a wall putty construction rheological parameter range measuring method, which comprises the following steps: and (3) measuring rheological parameters of a plurality of putty samples, manually scoring the workability of each putty sample, and determining the rheological parameter range of the putty sample with the workability reaching the standard according to the scoring value of each putty sample.
In the scheme, the acquisition of the rheological parameter range with the up-to-standard construction performance of the putty is based on manual scoring, the accuracy of the rheological parameter range with the up-to-standard construction performance of the putty can be improved by scoring the putty sample by a deep constructor, and although the method is based on manual scoring, a method for marking the construction performance of the putty is provided more objectively, and the construction performance of the putty is marked by the form (rheological parameter) of data. If the constructor is always used for judging the construction performance, the judgment result is easily influenced by personal subjective factors, and the grading results given by different persons and even the same person at different times are possibly inconsistent, so that the uncertainty of the grading result caused by the inconsistent subjective human factors greatly interferes with the development work of a product formula, and in the aspect of controlling the quality stability of a factory product, a set of objective and reliable technical indexes are also needed to measure the batch scraping hand feeling of the putty product. The construction performance of the putty product can be judged according to the relation between the rheological parameter of the putty product and the rheological parameter range of the putty construction performance reaching the standard, which is determined by the method, and is favorable for objective and unified quality management of factories.
Preferably, the rheological parameters of the putty sample comprise two parameters of yield stress and plastic viscosity, and the parameter range of the yield stress and plastic viscosity of each putty sample with the scoring value higher than the set value is used as the rheological parameter range of the putty with the qualified workability. It is generally considered that the construction hand feeling and rheological property of the putty are related, and the smaller the two rheological parameters are, the better the hand feeling is, but when the rheological parameters are too small, sagging of the putty can occur, and the construction quality is affected.
Preferably, the rheological parameter range of the putty sample for determining the construction performance to reach the standard comprises: establishing a two-dimensional coordinate system by taking yield stress and plastic viscosity as X-Y coordinate axis variables, drawing rheological parameter information of each putty sample in the two-dimensional coordinate system, and selecting a range of each data point which is divided into a plurality of data points higher than a set value in a plane of the two-dimensional coordinate system to obtain a rheological parameter range of which the construction performance of the putty meets the standard;
or, referring to fig. 1, the rheological parameter ranges of the putty sample for determining the construction performance to reach the standard include: and respectively establishing a three-dimensional coordinate system by using yield stress, plastic viscosity and manual scoring as X-Y-Z coordinate axis variables, drawing three variable data of each putty sample in the three-dimensional coordinate system, selecting each putty sample with the manual scoring higher than a set value in a Z axis to project to an X-Y plane, and selecting the range of each data point projected on the X-Y plane to obtain the rheological parameter range with the construction performance reaching the standard.
Preferably, referring to fig. 2, the rheological parameter range of the putty reaching the standard in workability is obtained by selecting each data point with a score higher than a set value in an X-Y plane by adopting a rectangular frame, or is a selected range obtained by sequentially connecting lines to each boundary point of each data point set with a score higher than the set value in the X-Y plane.
In the scheme, the selection range of the irregular pattern shape is obtained by sequentially connecting the lines with the boundary points of each data point set with the score higher than the set value in the X-Y plane, and the selection range of the irregular pattern is more accurate.
Preferably, the rheological parameter range of the putty reaching the standard in construction performance comprises a first rheological parameter range of selecting all data points which are manually scored higher than a set value in an X-Y plane and a second rheological parameter range of further selecting a region with densely distributed data points in the first rheological parameter range.
In the scheme, the design of the putty component formula is guided by selecting the smaller parameter range with densely distributed data points in the first rheological parameter range in the larger range, the putty is allocated to the second rheological parameter range, so that the construction performance of the putty product can be ensured, and when the rheological parameter of the putty product falls into the second rheological parameter range, the probability that the construction performance of the putty product reaches the standard can be increased.
Preferably, after the rheological parameter range of the putty sample with the qualified workability is determined, the method further comprises the process of correcting the rheological parameter range.
In the above scheme, a more accurate rheological parameter range can be obtained by correcting the rheological parameter, and the following correction method is provided:
s101, respectively establishing a three-dimensional coordinate system by using yield stress, plastic viscosity and manual scoring as X-Y-Z coordinate axis variables, and drawing three variable data of each putty sample in the three-dimensional coordinate system;
s102, selecting data points of each putty sample with the manual scoring higher than a set value in a Z axis to project to an X-Y plane, and selecting the range of each data point projected on the X-Y plane to obtain a rheological parameter range with the qualified putty construction performance;
s103, projecting data points of each putty sample with manual scoring lower than a set value to an X-Y plane, and selecting a range of each data point with each scoring lower than the set value projected on the X-Y plane to obtain a rheological parameter range with the putty construction performance not reaching standards;
wherein, the range of the rheological parameter of which the construction performance of the putty obtained in the step S103 does not reach the standard and the range of the rheological parameter of which the construction performance of the putty obtained in the step S102 reaches the standard have intersection;
s104, deleting the intersection part of the rheological parameter range with the unqualified putty workability obtained in the step S103 from the rheological parameter range with the qualified putty workability obtained in the step S102, so as to obtain a more accurate rheological parameter range with the qualified putty workability.
Preferably, in order to further improve the correction effect, the workability of the putty sample is classified into multiple classes, each class of putty sample is projected to the X-Y plane to obtain multiple rheological parameter ranges, each rheological parameter range comprises a plurality of rheological parameter ranges with qualified workability and a plurality of rheological parameter ranges with unqualified workability, each rheological parameter range has intersection points, when the rheological parameter range of a certain class of putty sample is to be obtained, the intersection point area of the rheological parameter range of the certain class of putty sample and other classes of putty sample is deleted, and thus, the more accurate putty parameter range can be obtained.
For example:
the construction performance of the putty is scored as 0 to 3 by the constructors, and the scoring system is as follows:
excellent: 2.3 to 2.5 minutes;
good: 2.1 to 2.3 minutes;
medium: 2.0 minutes;
the difference is: less than 2.0 minutes;
when the rheological parameter range of the putty sample with excellent score is obtained, respectively projecting the classified putty samples to an X-Y plane to obtain four putty rheological parameter ranges, wherein the edges of the four putty rheological parameter ranges have intersection points, and the intersection points of the rheological parameter ranges of the putty sample with excellent score and other three ranges are required to be deleted for conservation. In essence, the range of rheological parameters of the intersected putty is a transition range, and the putty with rheological parameters within the transition range has great uncertainty in workability, so that the range is preferentially deleted.
In the above scheme, the rheological parameter range reaching the standard of the putty workability is obtained by testing the limited putty samples, so that in order to improve the accuracy of the rheological parameter range reaching the standard of the putty workability, the correction process further comprises the step of continuing to test more putty samples in the subsequent process, thereby correcting the rheological parameter range determined before.
Preferably, the workability of the putty sample comprises a scratch hand during construction;
preferably, the highest score is set for the construction performance of the putty sample, and the rheological parameter range of each putty sample with the construction performance score of more than 70 percent of the highest score is obtained and is the rheological parameter range of the putty with the construction performance reaching the standard.
Preferably, determining the rheological parameters of the putty sample comprises the steps of:
s1, sample pretreatment: adding water into the putty sample according to a specified proportion, uniformly stirring and standing for 5 minutes to form putty paste; step S2 is directly carried out without sample pretreatment;
it should be noted that the putty sample may be putty powder or putty paste, when the putty sample is selected from putty powder, water is added according to a specified proportion, and the mixture is stirred uniformly and kept still for 5 minutes to form the putty paste; and when the putty sample is putty paste, directly entering step S2.
S2, sampling and loading samples to the putty paste according to the sampling requirement of a rotary rheometer: spreading putty paste with specified quality in a parallel plate test system of a rotary rheometer by using a knife, controlling the putty paste to be spread on a lower plate through extrusion of an upper plate, and contacting with the edge of the lower plate but not forming extrusion;
s3, rheological test: after the sample putty paste is stationary for 2min, testing is started, and the first stage is sequentially executed: the shear rate increases linearly from zero to the specified shear rate end, the second phase: the shear rate is reduced to zero from the designated shear rate, torque and rotation speed signals are acquired at intervals of delta t in each stage, and corresponding shear stress-shear rate data points are calculated and output;
and S4, performing linear fitting treatment on the shear stress-shear rate data points obtained in the step S3 to obtain the yield stress and the plastic viscosity of the putty sample.
Preferably, in step S4, a Bingham model is used to perform a linear fitting process, the fitting shear rate is reduced from a specified shear rate to a zero shear stress-shear rate effective data point, and the obtained intercept and slope are the yield stress and plastic viscosity of the corresponding putty sample, respectively;
preferably, the effective data point is that the shear rate is not less than 2s -1 All data points of the range.
Preferably, in step S3, the specified shear rate has a maximum value of 10 to 500 seconds -1 Any value in the range, the shearing time of each stage is any value in 0-60 s, and the thickness of the putty sample is 0.5-2 mm.
In the prior art, in the testing process of putty samples, under the high shear rate, the data acquired by a testing device commonly used in the industry have the defects of serious fluctuation, low fitting index, poor repeatability and the like, therefore, the invention adopts the rotary rheometer to test, and selects the range of each parameter in the test, so that the defect of large data error can be overcome, the shearing rate and the shearing time parameter range are the optimal experimental parameter range obtained by the inventor on the basis of a large number of experiments, the rheological test is suitable for being carried out on the rotary rheometer, the measurement of the rheological parameter of the putty samples in the testing parameter range is favorable for reducing the fluctuation and improving the data repeatability, and the inventor proves that when the maximum shearing rate is too low or too high, the shearing time is too short or too long, the obtained data can not reflect the construction performance, the shearing rate is too high, the plastic viscosity obtained by fitting the flow model and the yield stress data repeatability are poor. In order to reduce fluctuation and improve data repeatability, the lower plate of the parallel plate of the rotary rheometer is used for limiting edge breakage of a putty sample under high-speed shearing and can help to achieve the purposes of reducing fluctuation and improving data repeatability.
Example two
In example two, a specific rheological parameter range determination method is provided according to a specific example:
step one, a putty paste sample was prepared according to the formulation in table 1.
The sample preparation method comprises the following steps: adding a proper amount of water into a kettle for production, stirring at a constant speed by using a dispersion disc, slowly adding an adhesive, generating a large amount of foam at the moment, sequentially adding other assistants such as a defoaming agent and the like, and obtaining uniformly dispersed liquid after 15 min. Slowly adding heavy calcium powder, and reducing the rotating speed of a dispersing disc to disperse for 15min to obtain a pasty finished product.
Table 1 basic formulation composition of surface putty samples
And secondly, collecting a sample at the lower part of the kettle, and filling the sample in a 5L tank. Samples for the batch scraping, rheology testing, table jump and consistency testing were sampled in the same 5L tank with the tool.
And thirdly, rheological testing of the putty paste sample. The lower plate of the rheometer is regulated to a constant temperature, 12.2g of putty paste sample with specified mass is placed at the center position of the lower plate of the rotary rheometer, the distance (sample thickness) between the upper plate and the lower plate is slowly reduced to 1mm according to a preset program, and the sample is kept stand for 120s, so that the internal temperature difference is completely eliminated. After the test is started, the upper plate applies a continuous horizontal shear of a specified procedure to the sample, the first stage: shear rate of from 0s -1 To 500s -1 The second section: the shear rate is further from 500s -1 Reducing 0s -1 . For the second segment, 15 data points are taken, 1-12 points are selected, and a Bingham fluid model is used for fitting to obtain yield stress and plasticityViscosity. A total of 6 replicates were sampled and tested in parallel. And carrying out linear fitting treatment on the test results of each time, wherein the obtained intercept and slope are the yield stress and plastic viscosity of the sample respectively. The treatment results are shown in Table 2.
TABLE 2 rheological parameters Table after fitting data
The data in Table 2 were statistically processed to give an average yield stress of 562Pa and a relative standard deviation of 5.7%; the average plastic viscosity was 8.6Pa-s and the relative standard deviation was 2.7%. Table 3 below is filled with statistical averages of yield stress and plastic viscosity.
And step four, measuring and evaluating other samples in the table 1 by the methods of the step one, the step two and the step three to obtain the results in the table 3.
TABLE 3 rheological parameters and traditional Performance test data for multiple putty paste samples
Step five, referring to fig. 1, respectively using yield stress, plastic viscosity and manual scoring to establish a three-dimensional coordinate system for X-Y-Z coordinate axis variables, drawing three variable data of each putty sample in the three-dimensional coordinate system, selecting putty sample data points with scores above 2.1 in table 3 to project to an X-Y plane, referring to fig. 2, selecting each data point in the X-Y plane by adopting a rectangular frame, and obtaining the rheological parameter range reaching the standard of the putty workability.
The foregoing description is only illustrative of the preferred embodiment of the present invention, and is not to be construed as limiting the invention, but is to be construed as limiting the invention to any simple modification, equivalent variation and variation of the above embodiments according to the technical matter of the present invention without departing from the scope of the invention.
Claims (9)
1. A method for measuring a construction rheological parameter range of wall putty is characterized by comprising the following steps: measuring rheological parameters of a plurality of putty samples, and manually scoring the construction performance of each putty sample, wherein the rheological parameters of the putty samples comprise two parameters of yield stress and plastic viscosity, the highest score is set for the construction performance of the putty samples, and the rheological parameter range of each putty sample with the construction performance score of more than 70 percent of the highest score is obtained and is the rheological parameter range of the construction performance of the putty reaching the standard;
the construction performance of the putty sample comprises the scraping hand feeling of construction;
the method for measuring the rheological parameters of the putty sample comprises the following steps:
s1, sample pretreatment: adding water into the putty sample according to a specified proportion, uniformly stirring and standing for 5 minutes to form putty paste; wherein, the putty sample directly enters the step S2 without sample pretreatment;
s2, sampling and loading samples to the putty paste according to the sampling requirement of a rotary rheometer: spreading putty paste with specified quality in a parallel plate test system of a rotary rheometer by using a knife, controlling the putty paste to be spread on a lower plate through extrusion of an upper plate, and contacting with the edge of the lower plate but not forming extrusion;
s3, rheological test: after the sample putty paste is stationary for 2min, testing is started, and the first stage is sequentially executed: the shear rate increases linearly from zero to the specified shear rate end, the second phase: the shear rate is reduced to zero from the designated shear rate, torque and rotation speed signals are acquired at intervals of delta t in each stage, and corresponding shear stress-shear rate data points are calculated and output;
and S4, performing linear fitting treatment on the shear stress-shear rate data points obtained in the step S3 to obtain the yield stress and the plastic viscosity of the putty sample.
2. The method for determining the rheological parameter range of wall putty construction according to claim 1, wherein the determining the rheological parameter range of the putty sample with the qualified construction performance comprises the following steps: establishing a two-dimensional coordinate system by taking yield stress and plastic viscosity as X-Y coordinate axis variables, drawing rheological parameter information of each putty sample in the two-dimensional coordinate system, and selecting a range of each data point which is divided into a plurality of data points higher than a set value in a plane of the two-dimensional coordinate system to obtain a rheological parameter range of which the construction performance of the putty meets the standard;
or, the rheological parameter range of the putty sample for determining the construction performance to reach the standard comprises: and respectively establishing a three-dimensional coordinate system by using yield stress, plastic viscosity and manual scoring as X-Y-Z coordinate axis variables, drawing three variable data of each putty sample in the three-dimensional coordinate system, selecting each putty sample with the manual scoring higher than a set value in a Z axis to project to an X-Y plane, and selecting the range of each data point projected on the X-Y plane to obtain the rheological parameter range with the construction performance reaching the standard.
3. The method for measuring the rheological parameter range of wall putty construction according to claim 2, wherein the rheological parameter range reaching the standard of the putty construction performance is obtained by adopting a rectangular frame to select each data point with the score higher than a set value in an X-Y plane or is a selected range obtained by sequentially connecting lines to each boundary point of each data point set with the score higher than the set value in the X-Y plane.
4. A method of determining a range of rheological parameters for construction of a wall putty according to claim 3 wherein the range of rheological parameters for which the performance of the putty meets the standard comprises selecting a first range of rheological parameters for all manually scored data points above a set point in an X-Y plane and further selecting a second range of rheological parameters for areas of closely spaced data points within the first range of rheological parameters.
5. The method for measuring the rheological parameter range of wall putty construction according to claim 1, wherein after the rheological parameter range of the putty sample with the qualified construction performance is determined, the method further comprises the process of correcting the rheological parameter range.
6. The method for measuring the construction rheological parameter range of the wall putty according to claim 1, wherein the highest score is set for the construction performance of the putty sample, and the rheological parameter range of each putty sample with the construction performance score of more than 70 percent of the highest score is obtained and is the rheological parameter range of the construction performance of the putty reaching the standard.
7. The method according to claim 1, wherein in step S4, a Bingham model is used to perform linear fitting, and the intercept and slope obtained by fitting the effective data points of shear stress-shear rate at which the shear rate is reduced from the specified shear rate to zero are the yield stress and plastic viscosity of the corresponding putty sample, respectively.
8. The method for measuring the construction rheological parameter range of the wall putty according to claim 7, wherein the effective data points are all data points with the shearing rate more than or equal to 2s < -1 >.
9. The method according to claim 1, wherein in the step S3, the maximum value of the specified shear rate is any value in the range of 10-500S "1, the shear time in each stage is any value in the range of 0-60S, and the thickness of the putty sample is 0.5-2 mm.
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