CN116793840B - Compression test method for reinforced aerated concrete block - Google Patents
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Abstract
The invention relates to the technical field of material compressive strength testing methods, in particular to a compression testing method of a reinforcement aerated concrete block.
Description
Technical Field
The invention relates to the technical field of material compressive strength testing methods, in particular to a compression testing method of a reinforced aerated concrete block.
Background
With the vigorous development of novel building materials in the field of construction, the reinforced aerated concrete block with the characteristics of light weight, multiple holes, heat preservation and heat insulation is generated, and is mainly used for filling walls and partition walls, and the air hole content of the reinforced aerated concrete block is relatively high, so that the reinforced aerated concrete block has the characteristics of light weight, good heat preservation, strong heat insulation performance, incombustibility and the like, is widely applied to the enclosure filling structures of industrial and civil buildings, and has become a building material which is greatly popularized and developed in a plurality of countries.
Chinese patent publication No.: CN111811897a discloses a method for measuring compressive strength of autoclaved aerated concrete blocks, comprising the following steps: and (3) preparing a test piece, namely preparing a square test piece with the specification of 100mmx100mmx100mm according to the related specification of the autoclaved aerated concrete block, wherein the accuracy of the size of the test piece is 1mm. According to the method for measuring the compressive strength of the autoclaved aerated concrete block, the autoclaved aerated concrete block test piece is placed on the test bed and turned once every 4 hours, so that 6 faces of the autoclaved aerated concrete block test piece are in contact with the test bed, moisture in the autoclaved aerated concrete block test piece is uniformly distributed in the autoclaved aerated concrete block test piece under the action of gravity, the condition that the measured data is influenced due to uneven distribution of the moisture in the autoclaved aerated concrete block test piece is avoided, and the effects of simplicity, convenience, high efficiency and accuracy in measurement are achieved.
It can be seen that the following problems are present in the prior art,
1. in the prior art, pressure is required to be applied in the testing process until a concrete block test piece is damaged, and a damage load value is recorded, so that a large amount of concrete blocks are damaged and wasted, and the testing economy is not facilitated;
2. in the prior art, in some application scenarios, the compressive strength of the concrete block needs to be quickly determined, for example, a production line needs to detect a large amount of products.
Disclosure of Invention
Therefore, the invention provides a compression test method of a reinforcement aerated concrete block, which is used for solving the problems that the requirement of an application scene for rapidly determining the compression strength of the concrete block cannot be met and a great amount of damage and waste are caused to the concrete block in the test process in the prior art.
In order to achieve the above object, the present invention provides a method for detecting the strength of concrete, comprising:
step S1, constructing an association relation between a load change curve and compression strength, and recording the association relation to a sample database, wherein the load change curve is constructed based on the change condition that the load of a concrete block is displaced along with the downward pressing of a pressing mechanism in the process of acquiring the compression strength of the concrete block;
step S2, repeating the step S1 until the data volume in the sample database reaches a preset quantity threshold;
step S3, integrating the data in the sample database, wherein the step comprises the steps of setting a plurality of compression strength intervals, screening out load change curves corresponding to the compression strength intervals from the sample database based on the association relation between the load change curves and the compression strength, fitting the screened load change curves as characterization curves, and establishing the association relation between the characterization curves and the compression strength intervals;
step S4, performing a pressing test on the concrete block, acquiring a load change curve in real time in the test process, performing fitting judgment on a first load change curve segment, extracting the first load change curve segment, fitting with each characterization curve, judging a fitting state, determining a fitting mode of the rest load change curve segments based on the fitting state, wherein,
under the first fitting state, calculating the fitting degree of curve segments of load change curve segments with preset quantity and curve segments corresponding to each characterization curve one by one, calculating fitting parameters based on the fitting degree of each curve segment, and determining a best fitting curve based on the fitting parameters;
in the second fitting state, judging that the residual load change curve segment is no longer fitted in the follow-up process;
the first load change curve section is a load change curve corresponding to the concrete block after the pressing mechanism presses down a preset displacement for the first time, and the residual load change curve section is a load change curve corresponding to the concrete block after the pressing mechanism continues to press down the preset displacement;
and S5, determining the interval value of the compressive strength of the concrete block according to the compressive strength interval associated with the best fit curve.
Further, in the step S1, material property data of each concrete block is the same, the material property data including a length, a width, a height of the concrete block and a material composition constituting the concrete block.
Further, in the step S1, a relationship between the load change curve and the compression strength is constructed, wherein,
and establishing a load change curve by taking the load of the concrete block as a longitudinal axis and the downward displacement of the pressing mechanism as a transverse axis, recording the load corresponding to the concrete block when structural damage occurs in the continuous pressing process of the concrete block, recording the load as the compression strength of the concrete block, and establishing the association relation between the load change curve and the compression strength.
Further, in said step S3, several compression strength intervals are set, wherein,
setting an upper limit threshold and a lower limit threshold, wherein the upper limit threshold is the maximum value of the compressive strength in the sample database, the lower limit threshold is the minimum value of the compressive strength in the sample database, the threshold interval formed by the upper limit threshold and the lower limit threshold is divided into a plurality of subintervals on average, and the subintervals are determined to be the compressive strength intervals.
Further, in the step S3, a load change curve corresponding to each compressive strength interval is screened out from the sample database based on the association relationship between the load change curve and the compressive strength, wherein,
and if any compressive strength belongs to the compressive strength section, screening out a load change curve related to the compressive strength.
Further, in the step S4, a first load change curve segment is extracted and fitted to each of the characterization curves, and a fitting state is determined, wherein,
comparing the first segment fitting degree of the first load change curve segment and the first curve segment of each characterization curve with a preset fitting degree threshold value,
if the first section fitting degree is larger than the fitting degree threshold value, judging that the fitting state is a first fitting state;
if the first segment fitting degree is smaller than or equal to the fitting degree threshold value, judging that the fitting state is a second fitting state;
the first curve segment of the characterization curve is a curve segment with a transverse axis coordinate range of [0, E0] in the characterization curve, and E0 represents the displacement preset by the first pressing of the pressing mechanism.
Further, in the step S4, fitting parameters are calculated according to a formula (1) based on the fitting degree of each curve segment,
E＝R 1 +(R 2 )2+(R 3 )3+…+(R n )n (1)
in the formula (1), E is a fitting parameter, E is more than 0 and less than n, R 1 For the first segment of fitting degree, R 2 For the second segment fitting degree, R 3 For the third segment of fitting degree, R n And n is a positive integer for the nth section fitting degree.
Further, in said step S4, a best fit curve is determined based on said fit parameters, wherein,
and determining the characterization curve corresponding to the calculated maximum value of the fitting parameter as the best fitting curve.
Further, in the second fitting state, the method further comprises the steps of obtaining a load change curve in the testing process, determining the compression strength of the tested concrete block, establishing an association relation between the compression strength and the load change curve, and storing the association relation into the sample database.
Further, the step S3 is repeated every preset data update period.
Compared with the prior art, the method has the advantages that the obtained association relation between the load change curve and the compressive strength is recorded to the sample database, the load change curve corresponding to each compressive strength section is screened out based on the association relation between the load change curve and the compressive strength and is fitted to be a characterization curve, the pressurizing test is carried out on the concrete block, the load change curve in the test process is obtained in real time, the first load change curve section is subjected to fitting judgment, the fitting mode of the residual load change curve sections is determined based on the fitting degree of each curve section in the first fitting state, the fitting parameters are calculated based on the fitting degree of each curve section, the best fitting curve is determined, the residual load change curve sections are not fitted and are subjected to data correction in the sample database, the section value of the compressive strength of the concrete block is determined according to the compressive strength section associated with the best fitting curve, further, the rapid measurement of the compressive strength of the concrete block is realized, a large amount of damage and waste to the concrete block in the test process are avoided, and the test process is more economical and efficient under the premise of ensuring reliability.
In particular, the invention integrates a sample database for recording the association relation between the load change curve and the compression strength, in practical situations, in some application scenes, the rapid compression strength test is required to be carried out on concrete bricks so as to judge whether the requirements of building a use scene can be met, and the sample data are complicated and are unfavorable for rapidly screening sample data similar to the characteristics of a test piece to be tested in the test process.
Particularly, the method comprises the steps of carrying out sectional fitting on the obtained load change curve and the load change curve of a sample database in the test process, determining the fitting mode of the residual load change curve sections through the fitting state of the initial section fitting, and in the practical situation, carrying out quick compressive strength test on the concrete brick to judge whether the requirements of a construction use scene can be met.
In particular, in the process of carrying out first-segment fitting on a load change curve, if the effect of the first-segment fitting is judged to be in accordance with the requirement, the fitting degree of the load change curve of a plurality of segments is calculated, fitting parameters are calculated through the fitting degree of the plurality of segments, and the best fitting curve corresponding to the maximum value of the fitting parameters is screened, in the actual process, the fitting degree of each segment is calculated in a segmented mode, and the fitting parameters are calculated through different weights of each segment, so that the fitting degree required by the curve segment which is closer to the beginning is higher, the larger weight ratio is required in the calculation of the fitting parameters, the obtained fitting parameters can represent the fitting result of the curve, the best fitting curve can be screened more accurately, and the accuracy of predicting the compression strength of the concrete block sample is improved.
In particular, the invention continuously applies pressure to the sample to obtain the load change curve in the state that the fitting result of the first section of the load change curve does not meet the requirement, and stores the test data corresponding to the special pattern into the sample database according to the compression strength of the finally obtained sample, thereby expanding the sample volume and realizing the data correction of the sample database in the test process.
Drawings
FIG. 1 is a flow chart of a method of testing compression of a reinforced aerated concrete block according to an embodiment of the invention;
FIG. 2 is a fitting mode determination flow chart of an embodiment of the invention;
FIG. 3 is a schematic representation of a first curve segment of a characterization curve according to an embodiment of the invention;
in the figure, 1 is a first curve segment of a characterization curve.
Detailed Description
In order that the objects and advantages of the invention will become more apparent, the invention will be further described with reference to the following examples; it should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are merely for explaining the technical principles of the present invention, and are not intended to limit the scope of the present invention.
It should be noted that, in the description of the present invention, terms such as "upper," "lower," "left," "right," "inner," "outer," and the like indicate directions or positional relationships based on the directions or positional relationships shown in the drawings, which are merely for convenience of description, and do not indicate or imply that the apparatus or elements must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, it should be noted that, in the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to the specific circumstances.
Referring to fig. 1, a flowchart of a compression test method of a reinforced aerated concrete block according to an embodiment of the invention is shown, and the compression test method of the reinforced aerated concrete block of the invention includes:
step S1, constructing an association relation between a load change curve and compression strength, and recording the association relation to a sample database, wherein the load change curve is constructed based on the change condition that the load of a concrete block is displaced along with the downward pressing of a pressing mechanism in the process of acquiring the compression strength of the concrete block;
step S2, repeating the step S1 until the data volume in the sample database reaches a preset quantity threshold;
step S3, integrating the data in the sample database, wherein the step comprises the steps of setting a plurality of compression strength intervals, screening out load change curves corresponding to the compression strength intervals from the sample database based on the association relation between the load change curves and the compression strength, fitting the screened load change curves as characterization curves, and establishing the association relation between the characterization curves and the compression strength intervals;
step S4, performing a pressing test on the concrete block, acquiring a load change curve in real time in the test process, performing fitting judgment on a first load change curve segment, extracting the first load change curve segment, fitting with each characterization curve, judging a fitting state, determining a fitting mode of the rest load change curve segments based on the fitting state, wherein,
under the first fitting state, calculating the fitting degree of curve segments of load change curve segments with preset quantity and curve segments corresponding to each characterization curve one by one, calculating fitting parameters based on the fitting degree of each curve segment, and determining a best fitting curve based on the fitting parameters;
in the second fitting state, judging that the residual load change curve segment is no longer fitted in the follow-up process;
the first load change curve section is a load change curve corresponding to the concrete block after the pressing mechanism presses down a preset displacement for the first time, and the residual load change curve section is a load change curve corresponding to the concrete block after the pressing mechanism continues to press down the preset displacement;
and S5, determining the interval value of the compressive strength of the concrete block according to the compressive strength interval associated with the best fit curve.
Specifically, the specific mode of calculating the fitting degree of the multiple curves and the multiple curves is not limited, the fitting can be performed according to the MATLAB platform, and the fitting can be realized through an algorithm capable of realizing the function, which is the prior art and is not repeated here.
Specifically, the method comprises the steps of recording the association relation between the obtained load change curve and the compressive strength to a sample database, screening out the load change curve corresponding to each compressive strength section based on the association relation between the load change curve and the compressive strength, fitting the load change curve to be a characterization curve, performing a pressing test on the concrete block, obtaining the load change curve in the test process in real time, performing fitting judgment on a first load change curve section, determining the fitting mode of the residual load change curve sections based on the fitting state, calculating fitting parameters based on the fitting degree of each curve section in the first fitting state, determining the best fitting curve, determining that the residual load change curve sections are not fitted later in the second fitting state, performing data correction on the sample database, and determining the section value of the compressive strength of the concrete block according to the compressive strength section associated with the best fitting curve, thereby realizing rapid measurement of the compressive strength of the concrete block, avoiding a large amount of damage and waste to the concrete block in the test process, and ensuring that the test process is more economical and efficient.
Specifically, in the step S1, the material property data of each concrete block is the same, the material property data including the length, width, height of the concrete block and the material composition constituting the concrete block.
Specifically, in the step S1, a relationship between the load change curve and the compression strength is constructed, wherein,
and (3) taking the load P of the concrete block as a longitudinal axis, taking the downward displacement S of the pressing mechanism as a transverse axis to establish a load change curve, recording the load corresponding to the concrete block when structural damage occurs in the continuous pressing process of the concrete block, recording the load as the compression strength of the concrete block, and establishing the association relation between the load change curve and the compression strength.
Specifically, the purpose of the preset number threshold in the sample database in the invention is to ensure a certain data sample size, so that the characterization curve of each compression strength interval can be obtained more accurately, and a person skilled in the art can preset the number threshold of the sample database according to the setting logic, preferably, 10 pieces of load change curve information can be set in each compression strength interval.
Specifically, in the step S3, several compression strength intervals are set, wherein,
setting an upper limit threshold and a lower limit threshold, wherein the upper limit threshold is the maximum value of the compressive strength in the sample database, the lower limit threshold is the minimum value of the compressive strength in the sample database, the threshold interval formed by the upper limit threshold and the lower limit threshold is divided into a plurality of subintervals on average, and the subintervals are determined to be the compressive strength intervals.
Specifically, in the step S3, a load change curve corresponding to each compressive strength section is screened out from the sample database based on the association relationship between the load change curve and the compressive strength, wherein,
and if any compressive strength belongs to the compressive strength section, screening out a load change curve related to the compressive strength.
In practical situations, in some application scenarios, a quick compression strength test is required to be performed on concrete bricks to judge whether the requirements of construction use scenarios can be met, and sample data similar to characteristics of a test piece to be tested are not easy to screen out in the test process due to complex sample data.
Referring to fig. 2 and 3, fig. 2 is a fitting mode determining flowchart according to an embodiment of the invention, and fig. 3 is a schematic diagram of a first curve segment 1 of a characterization curve according to an embodiment of the invention.
Specifically, in the step S4, a first load change curve segment is extracted and fitted to each of the characterization curves, and a fitted state is determined, wherein,
fitting a first load variation curve segment to a first curve segment of each of the characterization curves 1 With a preset fitness threshold R 0 In the comparison of the two types of materials,
if the first segment fitting degree R 1 Greater than the fitness threshold R 0 Judging the fitting state as a first fitting state;
if the first segment fitting degree R 1 Less than or equal to the fitness threshold R 0 Judging the fitting state to be a second fitting state;
wherein, a fitness threshold R can be set 0 ＝0.9；
The first curve segment of the characterization curve is a curve segment with a transverse axis coordinate range of [0, E0] in the characterization curve, and E0 represents the displacement preset by the first pressing of the pressing mechanism.
Specifically, in the step S4, fitting parameters are calculated according to the formula (1) based on the fitting degree of each curve segment,
E＝R 1 +(R 2 )2+(R 3 )3+…+(R n )n (1)
in the formula (1), E is a fitting parameter, E is more than 0 and less than n, R 1 For the first segment of fitting degree, R 2 For the second segment fitting degree, R 3 For the third segment of fitting degree, R n And n is a positive integer for the nth section fitting degree.
The second segment fitting degree is the fitting degree of the second load change curve segment and the second curve segment in the characterization curve.
Specifically, in said step S4, a best fit curve is determined based on said fit parameter E, wherein,
maximum value E of fitting parameter obtained by calculation max The corresponding characterization curve is determined as the best fit curve.
Specifically, in the process of performing first-segment fitting on the load change curve, if the first-segment fitting is judgedIf the effect of (2) meets the requirement, calculating the fitting degree of a load change curve of a plurality of sections, calculating a fitting parameter E through the fitting degree of the plurality of sections, and screening the maximum value E of the fitting parameter max In the actual process, the corresponding best fit curve has certain errors between the load change curve of the test piece and the load change curve of the sample database, the fitting degree of each section is calculated by sections, the fitting degree of the curve section which is closer to the beginning is higher through participation of different weights of each section in calculation of fit parameters, the larger weight occupation ratio is also needed in calculation of the fit parameters, the obtained fit parameters can represent the fitting result of the curve, the best fit curve can be screened out more accurately, and further, the accuracy of predicting the compression strength of the concrete block test piece is improved.
Specifically, the method comprises the steps of carrying out sectional fitting on the obtained load change curve and the load change curve of a sample database in the test process, determining the fitting mode of the residual load change curve sections through the fitting state of the initial section fitting, and in the practical situation, carrying out quick compressive strength test on the concrete brick to judge whether the requirements of a construction use scene can be met.
Specifically, when the load change curve in the first fitting state is fitted, the number of preset load change curve segments aims at that according to the precision required by actual production, the more the number of the preset load change curve segments is, the more accurate the pre-estimated sample compression slight interval value is, the number of the load change curve segments can be preset according to the setting logic by a person skilled in the art, and preferably, the number of the load change curve segments can be set to be 5 segments.
Specifically, in the second fitting state, the method further comprises the steps of obtaining a load change curve in the testing process, determining the compression strength of the tested concrete block, establishing an association relation between the compression strength and the load change curve, and storing the association relation into the sample database.
Specifically, step S3 is repeated every predetermined data update period.
Specifically, in the state that the fitting result of the first section of the load change curve does not meet the requirement, the load change curve is obtained by continuously pressing the sample, the test data corresponding to the special pattern is stored in the sample database according to the compression strength of the finally obtained sample, the sample quantity is expanded, and the data correction of the sample database in the test process is realized.
Thus far, the technical solution of the present invention has been described in connection with the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of protection of the present invention is not limited to these specific embodiments. Equivalent modifications and substitutions for related technical features may be made by those skilled in the art without departing from the principles of the present invention, and such modifications and substitutions will be within the scope of the present invention.
Claims (10)
1. The compression testing method of the reinforced aerated concrete block is characterized by comprising the following steps of:
step S1, constructing an association relation between a load change curve and compression strength, and recording the association relation to a sample database, wherein the load change curve is constructed based on the change condition that the load of a concrete block is displaced along with the downward pressing of a pressing mechanism in the process of acquiring the compression strength of the concrete block;
step S2, repeating the step S1 until the data volume in the sample database reaches a preset quantity threshold;
step S3, integrating the data in the sample database, wherein the step comprises the steps of setting a plurality of compression strength intervals, screening out load change curves corresponding to the compression strength intervals from the sample database based on the association relation between the load change curves and the compression strength, fitting the screened load change curves as characterization curves, and establishing the association relation between the characterization curves and the compression strength intervals;
step S4, performing a pressing test on the concrete block, acquiring a load change curve in real time in the test process, performing fitting judgment on a first load change curve segment, extracting the first load change curve segment, fitting with each characterization curve, judging a fitting state, determining a fitting mode of the rest load change curve segments based on the fitting state, wherein,
under the first fitting state, calculating the fitting degree of curve segments of load change curve segments with preset quantity and curve segments corresponding to each characterization curve one by one, calculating fitting parameters based on the fitting degree of each curve segment, and determining a best fitting curve based on the fitting parameters;
in the second fitting state, judging that the residual load change curve segment is no longer fitted in the follow-up process;
the first load change curve section is a load change curve corresponding to the concrete block after the pressing mechanism presses down a preset displacement for the first time, and the residual load change curve section is a load change curve corresponding to the concrete block after the pressing mechanism continues to press down the preset displacement;
and S5, determining the interval value of the compressive strength of the concrete block according to the compressive strength interval associated with the best fit curve.
2. The method of compression testing of reinforced aerated concrete blocks according to claim 1, wherein in step S1, the material property data of each concrete block is the same, the material property data including the length, width, height of the concrete block and the material composition constituting the concrete block.
3. The method for testing the compression of the reinforced aerated concrete block according to claim 1, wherein in the step S1, the association relation between the load change curve and the compression strength is constructed, wherein,
and establishing a load change curve by taking the load of the concrete block as a longitudinal axis and the downward displacement of the pressing mechanism as a transverse axis, recording the load corresponding to the concrete block when structural damage occurs in the continuous pressing process of the concrete block, recording the load as the compression strength of the concrete block, and establishing the association relation between the load change curve and the compression strength.
4. A method of testing compression of reinforced aerated concrete blocks according to claim 3, wherein in step S3, a number of compression strength intervals are set, wherein,
setting an upper limit threshold and a lower limit threshold, wherein the upper limit threshold is the maximum value of the compressive strength in the sample database, the lower limit threshold is the minimum value of the compressive strength in the sample database, the threshold interval formed by the upper limit threshold and the lower limit threshold is divided into a plurality of subintervals on average, and the subintervals are determined to be the compressive strength intervals.
5. The method according to claim 4, wherein in the step S3, the load change curves corresponding to the respective compression strength intervals are screened out from the sample database based on the association relation between the load change curves and the compression strengths,
and if any compressive strength belongs to the compressive strength section, screening out a load change curve related to the compressive strength.
6. The method according to claim 1, wherein in the step S4, a first load change curve segment is extracted and fitted to each of the characterization curves, and a fitted state is determined, wherein,
comparing the first segment fitting degree of the first load change curve segment and the first curve segment of each characterization curve with a preset fitting degree threshold value,
if the first section fitting degree is larger than the fitting degree threshold value, judging that the fitting state is a first fitting state;
if the first segment fitting degree is smaller than or equal to the fitting degree threshold value, judging that the fitting state is a second fitting state;
the first curve segment of the characterization curve is a curve segment with a transverse axis coordinate range of [0, E0] in the characterization curve, and E0 represents the displacement preset by the first pressing of the pressing mechanism.
7. The method for testing the compression of the reinforced aerated concrete block according to claim 6, wherein in the step S4, fitting parameters are calculated according to a formula (1) based on fitting degrees of curve segments,
E＝R 1 +(R 2 )2+(R 3 )3+…+(R n )n(1)
in the formula (1), E is a fitting parameter, E is more than 0 and less than n, R 1 For the first segment of fitting degree, R 2 For the second segment fitting degree, R 3 For the third segment of fitting degree, R n And n is a positive integer for the nth section fitting degree.
8. The method according to claim 7, wherein in said step S4, a best fit curve is determined based on said fitting parameters, wherein,
and determining the characterization curve corresponding to the calculated maximum value of the fitting parameter as the best fitting curve.
9. The method according to claim 1, wherein in the step S4, in the second fitting state, further comprising obtaining a load change curve during the test and determining a compressive strength of the tested concrete block, and storing the compressive strength and the load change curve in the sample database after establishing an association relationship.
10. The method for compressive testing of reinforced aerated concrete blocks according to claim 9, further comprising repeating step S3 every predetermined data update period.
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