CN106093356B - Method for correcting experimental error of concrete - Google Patents
Method for correcting experimental error of concrete Download PDFInfo
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- CN106093356B CN106093356B CN201610391916.3A CN201610391916A CN106093356B CN 106093356 B CN106093356 B CN 106093356B CN 201610391916 A CN201610391916 A CN 201610391916A CN 106093356 B CN106093356 B CN 106093356B
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- 239000004567 concrete Substances 0.000 title claims abstract description 108
- 238000000034 method Methods 0.000 title claims abstract description 36
- 238000002474 experimental method Methods 0.000 claims abstract description 53
- 230000000052 comparative effect Effects 0.000 claims abstract description 19
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 238000012937 correction Methods 0.000 claims abstract description 10
- 238000012360 testing method Methods 0.000 claims description 6
- 238000011066 ex-situ storage Methods 0.000 claims description 3
- 230000036962 time dependent Effects 0.000 claims description 2
- 239000003638 chemical reducing agent Substances 0.000 abstract description 8
- 239000000654 additive Substances 0.000 abstract description 7
- 230000000996 additive effect Effects 0.000 abstract description 5
- 238000013329 compounding Methods 0.000 abstract description 4
- DGVVJWXRCWCCOD-UHFFFAOYSA-N naphthalene;hydrate Chemical compound O.C1=CC=CC2=CC=CC=C21 DGVVJWXRCWCCOD-UHFFFAOYSA-N 0.000 abstract description 3
- 150000001875 compounds Chemical class 0.000 abstract 1
- 239000012452 mother liquor Substances 0.000 description 21
- 238000001514 detection method Methods 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 9
- 239000002253 acid Substances 0.000 description 8
- 230000007613 environmental effect Effects 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 238000007689 inspection Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000004575 stone Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 150000001732 carboxylic acid derivatives Chemical class 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 229920005646 polycarboxylate Polymers 0.000 description 2
- 238000003908 quality control method Methods 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 239000008030 superplasticizer Substances 0.000 description 2
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 description 1
- 238000012935 Averaging Methods 0.000 description 1
- 229920001732 Lignosulfonate Polymers 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 125000001931 aliphatic group Chemical group 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000013401 experimental design Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000012372 quality testing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000000176 sodium gluconate Substances 0.000 description 1
- 229940005574 sodium gluconate Drugs 0.000 description 1
- 235000012207 sodium gluconate Nutrition 0.000 description 1
- 238000013024 troubleshooting Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; Lime; Mortar; Gypsum; Bricks; Ceramics; Glass
- G01N33/383—Concrete or cement
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Physics & Mathematics (AREA)
- Ceramic Engineering (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
- Preparation Of Clay, And Manufacture Of Mixtures Containing Clay Or Cement (AREA)
Abstract
The invention discloses a method for correcting experimental errors of concrete, and relates to the design of concrete refinement experiments. The invention comprises the following steps: 1) the method comprises the following steps of (1) carrying out the same experiment by time intervals by adopting a plurality of groups of concrete raw material groups provided with reference concrete and comparative concrete, and collecting related experiment data and related factor data influencing the experiment; 2) fitting a curve to the reference concrete related experiment data of each group; 3) correcting the experimental data of the comparative concrete according to the fitting curve; 4) carrying out data regression fitting curve on the relevant experimental data of the reference concrete and the relevant factor data influencing the experiment; 5) and correcting the comparative concrete experimental data in the step 3) again according to the fitting curve in the step 4). The invention can be particularly suitable for additive compound factories and commercial mixing stations capable of compounding additives for data correction; and can also be used for detecting the quality of raw materials such as naphthalene water reducing agent, retarder and the like and finished products.
Description
Technical Field
The invention relates to concrete refinement experimental design, in particular to a method for correcting concrete experimental errors.
Background
Concrete is a general term for engineering composite materials in which aggregates are cemented into a whole by cementitious materials. The concrete mainly comprises: (1) the cementing material is mainly cement, and also admixtures such as fly ash, mineral powder, silica fume and the like; (2) aggregate, mainly comprising aggregate such as sand, stone and the like; (3) mixing water, a certain amount of mixing water is required to react with the cementing material, and the workability such as the fluidity of concrete is provided; (4) the admixture, the concrete admixture, is an important component, and plays an important role in the performance of the strength, the fluidity, the workability, the gas content, the durability and the like of the concrete.
The authenticity and reproducibility of the experimental results of concrete is questionable due to the complex composition of the concrete raw materials, hundreds of variations in the mineral composition of the cement, plus variations in the composition and quality of the aggregate. Firstly, to ensure the concrete admixture quality detection result to be real and reliable, the method is required to eliminate factors which interfere the quality detection experiment result, such as experiment material fluctuation, human factors, machine equipment fluctuation, experiment environment condition change and the like. Generally, concrete mixing laboratories of admixture companies and commercial mixing stations do not have experimental facilities for controlling the temperature and humidity of the laboratory environment, so that experimental errors certainly exist.
In the prior art, the polycarboxylic acid water reducing agent is mostly subjected to sample retention comparison in a troubleshooting experiment and in-and-out-of-factory detection, and the result is that the experiment results are considered to be the same within a certain error range and are not beneficial to fine experiment result collection;
in addition, environmental factors cannot be completely eliminated when additive orthogonal experiments and additive regularity experiments are carried out, and the interference of human factors on experimental results is usually carried out by adopting a method of repeatedly carrying out experiments for many times and then carrying out averaging to carry out result reduction. If the concrete cube compressive strength is tested, the median value is adopted for repairing; and the quality detection of the admixture adopts multiple comparisons and then takes the average value to repair.
The method has the problems that background interference factors such as environment, machines, people and the like cannot be completely eliminated, and detection data are persuasive after being repeated for many times;
and due to the existence of experiment fluctuation, the rule is difficult to find in the refined experiment, and the result error of the orthogonal experiment is difficult to eliminate.
Disclosure of Invention
The invention aims to solve the technical problem of providing a method for correcting the experimental error of concrete, aiming at eliminating the interference of the environmental condition change factors of the concrete experiment on the experimental result.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for correcting experimental errors of concrete is characterized by comprising the following steps: the method comprises the following steps:
1) the method comprises the following steps of (1) carrying out the same experiment by time intervals by adopting a plurality of groups of concrete raw material groups provided with reference concrete and comparative concrete, and collecting related experiment data and related factor data influencing the experiment;
2) fitting a curve to the reference concrete related experiment data of each group;
3) correcting the experimental data of the comparative concrete according to the fitting curve;
4) carrying out data regression fitting curve on the relevant experimental data of the reference concrete and the relevant factor data influencing the experiment;
5) and correcting the comparative concrete experimental data in the step 3) again according to the fitting curve in the step 4).
The technical scheme is further that the method is suitable for correcting experimental errors of the admixture or admixture concrete.
The further technical scheme is that the related experimental data comprise the extension degree of the machine, the time and the loss of the extension degree over time.
The further technical scheme is that the relevant factor data influencing the experiment are temperature and humidity.
The further technical scheme is that the step 1) adopts all-weather time-sharing test.
The further technical proposal is that the step 2) is to draw a fitting curve according to the ex-situ extension degree and the time-dependent loss change of the reference concrete,
the further technical scheme is that the correction step in the step 3) is as follows:
(1) observing relevant experimental data of the reference concrete in each group of concrete raw material groups according to the fitting curve in the step 2), and determining the relation between the reference concrete and the reference concrete;
(2) and (3) correcting other comparative concrete related experimental data according to the relation determined in the step (1).
The further technical scheme is that the correction step in the step 3) is as follows:
(1) and taking one group of the related experimental data of the reference concrete in the same time period as reference data, and dividing each group of the related experimental data of the reference concrete by the reference data to determine a correlation coefficient.
(2) And dividing the comparative concrete related experimental data in the same time period by the correlation coefficient to serve as a correction value.
The further technical scheme is that the step 4) is to perform polynomial fitting on the change of the extension degree of the outgoing machine in the reference data and the temperature or the humidity respectively to obtain a curve.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: the method can correct the product inspection result of the polycarboxylic acid mother liquor according to the change of the temperature and the humidity of the environment, and is particularly suitable for additive compounding plants and commercial mixing stations capable of compounding additives for data correction; the method is not only used for detecting the quality of the polycarboxylic acid mother liquor, but also can be used for detecting the quality of raw materials and finished products such as naphthalene water reducing agents, retarders and the like, and can also be used for correcting experimental data results with a large number of experimental groups in schools and scientific research institutions, such as correcting full-factor experiments and orthogonal experimental results.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
The invention discloses a method for correcting experimental errors of concrete, which is characterized by comprising the following steps: the method comprises the following steps:
1) the method comprises the following steps of (1) carrying out the same experiment by time intervals by adopting a plurality of groups of concrete raw material groups provided with reference concrete and comparative concrete, and collecting related experiment data and related factor data influencing the experiment;
2) fitting a curve to the reference concrete related experiment data of each group;
3) correcting the experimental data of the comparative concrete according to the fitting curve;
4) carrying out data regression fitting curve on the relevant experimental data of the reference concrete and the relevant factor data influencing the experiment;
5) and correcting the comparative concrete experimental data in the step 3) again according to the fitting curve in the step 4).
Preferably, the method is suitable for correcting experimental errors of the admixture or admixture concrete.
Preferably, the relevant experimental data comprise the extension degree of the machine, the time and the loss of the extension degree over time.
Preferably, the relevant factor data influencing the experiment are temperature and humidity.
Preferably, the step 1) adopts all-weather time-sharing test.
Preferably, the step 2) is to draw a fitting curve according to the change of the out-of-machine expansion degree and the time loss of the reference concrete,
preferably, the correcting step in step 3) is as follows:
(1) observing relevant experimental data of the reference concrete in each group of concrete raw material groups according to the fitting curve in the step 2), and determining the relation between the reference concrete and the reference concrete;
(2) and (3) correcting other comparative concrete related experimental data according to the relation determined in the step (1).
Preferably, the correcting step in step 3) is as follows:
(1) and taking one group of the related experimental data of the reference concrete in the same time period as reference data, and dividing each group of the related experimental data of the reference concrete by the reference data to determine a correlation coefficient.
(2) And dividing the comparative concrete related experimental data in the same time period by the correlation coefficient to serve as a correction value.
Preferably, in the step 4), a polynomial is respectively performed on the change of the extension of the machine in the reference data and the temperature or the humidity to perform curve fitting.
Examples
The embodiment is used for the quality control experiment correction of the polycarboxylic acid water-reducing mother liquor concrete, and mainly comprises the following three steps: the first step is to correct the experimental result according to the data change of the reference concrete; secondly, searching a relation between the data change of the reference concrete and the temperature and humidity change; and thirdly, directly correcting other experimental results according to the temperature and humidity change.
The concrete quality detection experiment of the polycarboxylate superplasticizer mother liquor is detected according to a method of mixing high-performance water reducer concrete in GB 8076-2008, the mixing amount of each disc of concrete is 15L, and experimental materials for mixing 35 discs of concrete are required to be prepared totally. The experimental materials were: omelango 42.5 ordinary portland cement; crushing 5-10 mm stone; 10-20 mm of crushed stone; full-dry machine-made sand (fineness modulus Mx is 2.6); the admixture adopts the polycarboxylate superplasticizer mother liquor (P1, P2, S1, S2, S3, S4, C5, C6, C7, Y1, Y2 and the like) produced by the company. The quality testing compounding ratio of the admixture is shown in Table 1: watch (A)
1. Polycarboxylic acid mother liquor concrete quality detection mixing proportion
1. First, the experimental results are corrected by the change of the reference data
(1) And (5) performing a polycarboxylic acid mother liquor quality detection experiment and collecting experimental data.
From 8:30 in the morning to 17:30 afternoon, the environmental temperature gradually rises, the environmental humidity gradually falls, the extension degree of the concrete exiting machine gradually becomes smaller, and the concrete loss is gradually accelerated. The more accurate evaluation mode is to beat a disc of reference concrete every hour, observe the ex-situ expansion degree and the time loss change of the reference concrete every time, draw a fitting curve, and correct the data of comparison group according to the change data of the reference concrete. And simultaneously recording the environmental temperature and humidity conditions of the reference concrete and the comparison group concrete every time.
Taking the mother liquor P2 as an example, the concrete doped with the polycarboxylic acid admixture mother liquor is subjected to water deduction according to the water reduction rate of 26 percent, and the mixing proportion of the concrete doped with the admixture is calculated and shown in Table 1. And (3) performing a quality detection experiment on the rest of carboxylic acid mother liquor according to the same mixing ratio as the P2 mother liquor, testing the initial expansion degree and the loss of the expansion degree of the concrete over time, recording the temperature and the humidity of the environment of the laboratory, barreling and covering after the expansion degree of the concrete is tested every time, testing the loss over time according to the specified time, wherein the experimental result is shown in table 2.
TABLE 2 quality test data for all day concrete admixtures
(2) And (5) observing the change rule of the P2 reference data, and determining the coefficient. The first set of P2 reference data coefficients was assigned to 1, and the remaining P2 reference sets of data were all divided by the first set of P2 data to determine the coefficients.
TABLE 3P 2 Standard mother liquor Explorer extension and tendency of change of loss with time
(3) Other mother liquor quality measurements over each hour period were corrected by dividing by the factor of the baseline P2 mother liquor, and the results are shown in table 4.
TABLE 4 comparative mother liquor (excluding P2 reference group) out-of-machine spread and tendency of change in loss with time
2. Secondly, determining the relation between the P2 reference change and the temperature and humidity change by a data regression fitting method
The relation fitting curve of P2 reference mother liquid out-of-machine expansion degree change and temperature has higher 6 th-order polynomial fitting precision, and R of temperature and out-of-machine expansion degree fitting, 0.5 hour expansion degree fitting and 1 hour expansion degree fitting2Are all greater than 0.99. For example, the six-degree relation of the fitting of the temperature and the out-of-machine spread is as follows:
y＝-17.968x6+2487.3x5-143438x4+4E+06x3-8E+07x2+7E+08x-3E+09；
R2＝0.9919
to simplify the calculation, a quadratic polynomial fit, R, is used2Typically greater than 0.97. And R of a 6 th order polynomial fit of humidity to outgoing machine spread2Less than 0.5, the accuracy is not sufficient, and the fitting formula is as follows:
y＝2.9198x6-1343.8x5+257701x4+3E+07x3+2E+09x2-5E+10x+6E+11；
R2＝0.4428
the reason is that the iron plate for each concrete experiment is wetted, and each plate of concrete is arranged in the barrel after the concrete expansion degree is tested, and the cover is covered, so that the influence of humidity on the concrete expansion degree is not as good as the influence of temperature, and the change of the expansion degree data is mainly calculated through temperature change data.
For example, the quadratic relation fit between temperature and the degree of extension of the machine is:
y＝5.7375x2-274.54x + 3814.2; formula (1)
According to the formula, the extension degree data of the extruder corresponding to other temperatures of the P2 reference mother liquor can be calculated.
3. Correcting the experimental results according to the temperature variation data
Daily polycarboxylic acid mother liquor quality inspection data are shown in table 5, the P2 mother liquor is used as a reference, the rest mother liquor is used as a comparison group, the temperature and the humidity of each group of experiments are recorded, and then the experiment results are corrected according to the formula (1). For example, to correct the experimental result of the extension degree of C5 outgoing machine of 11:30, the extension degree of P2 outgoing machine of 11:30 is calculated, the temperature of 22.7 ℃ is substituted into the formula (1) to obtain the extension degree of P2 outgoing machine of 11:30 to be 538.6 mm; the result of the 11: 30C 5 experiment was corrected based on the 9: 00P 2 standard extension data, and k is 360 × 538.6 ÷ 545 ═ 355.8 mm.
TABLE 5 comparison of mother liquor quality control data
In the technical scheme 2 and the second step of the embodiment of the invention, the relation between the reference change of P2 and the change of temperature and humidity is determined by a data regression fitting method, and the following improvements can be made:
1. the polynomial fit may be between 2 and 6;
2. the set of experiment correction method can be used for correcting experiment results with a large number of experiment sets in other industries and can also be used for correcting orthogonal experiment results.
3. The reference group can adopt a blank experiment without an additive or an experiment group with other carboxylic acid mother liquor, and can also be used for the quality inspection experiment of raw materials or finished products such as a naphthalene water reducing agent, sodium gluconate, a lignosulfonate water reducing agent, an amino water reducing agent, an aliphatic water reducing agent and the like.
4. The invention adopts the change result of the reference data to correct the experimental data of the comparison group, then finds the relation between the change of the experimental data of the reference group and the change of the environmental conditions, and the subsequent experiment can directly correct the experimental result according to the change of the environmental conditions, and can easily find the change rule of the experimental data.
Claims (6)
1. A method for correcting experimental errors of concrete is characterized by comprising the following steps: the method comprises the following steps:
1) the method comprises the following steps of (1) carrying out the same experiment by time intervals by adopting a plurality of groups of concrete raw material groups provided with reference concrete and comparative concrete, and collecting related experiment data and related factor data influencing the experiment;
2) carrying out curve fitting on the relevant experimental data of the reference concrete of each group;
3) correcting the experimental data of the comparative concrete according to the fitting curve;
4) carrying out data regression curve fitting on the relevant experimental data of the reference concrete and the relevant factor data influencing the experiment;
5) correcting the comparative concrete experimental data in the step 3) again according to the fitting curve in the step 4);
the related experimental data comprise the extension degree of the machine, the time and the loss of the extension degree over time;
the relevant factor data influencing the experiment are temperature and humidity.
2. The method for correcting experimental error of concrete according to claim 1, wherein the method comprises the following steps: the method is suitable for correcting experimental errors of the admixture or admixture concrete.
3. The method for correcting experimental error of concrete according to claim 1, wherein the method comprises the following steps: and the step 1) adopts all-weather time-interval test.
4. A method of correcting experimental errors in concrete according to claim 1 or 2, characterised in that: and 2) drawing a fitting curve according to the ex-situ expansion degree and the time-dependent loss change of the reference concrete.
5. The method for correcting experimental error of concrete according to claim 1, wherein the method comprises the following steps: the correction step in the step 3) is as follows:
(1) observing relevant experimental data of the reference concrete in each group of concrete raw material groups according to curve fitting in the step 2), and determining the relation between the reference concrete and the reference concrete;
(2) correcting other comparative concrete related experimental data according to the relation determined in the step (1);
specifically, the method comprises the following steps:
(1) taking one group of reference concrete related experimental data in the same time period as reference data, and dividing each group of reference concrete related experimental data by the reference data to determine a correlation coefficient;
(2) and dividing the comparative concrete related experimental data in the same time period by the correlation coefficient to serve as a correction value.
6. A method of correcting experimental errors in concrete according to claim 1 or 2, characterised in that: and 4) performing polynomial curve fitting on the change of the extension degree of the outgoing machine in the reference data and the temperature or the humidity respectively.
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| CN104251882A (en) * | 2014-09-30 | 2014-12-31 | 湖南理工学院 | Establishment method of concrete compression strength curve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102095597A (en) * | 2011-01-11 | 2011-06-15 | 中南大学 | Method for measuring temperature correction factor of bridge fatigue life gage |
| CN104251882A (en) * | 2014-09-30 | 2014-12-31 | 湖南理工学院 | Establishment method of concrete compression strength curve |
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| 影响混凝土外加剂与水泥适应性因素的分析;梁天宇;《科学之友》;20110731(第14期);第12-13页 * |
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