CN112432872A - Ternary strength measurement curve of concrete - Google Patents
Ternary strength measurement curve of concrete Download PDFInfo
- Publication number
- CN112432872A CN112432872A CN201910835729.3A CN201910835729A CN112432872A CN 112432872 A CN112432872 A CN 112432872A CN 201910835729 A CN201910835729 A CN 201910835729A CN 112432872 A CN112432872 A CN 112432872A
- Authority
- CN
- China
- Prior art keywords
- concrete
- value
- ternary
- curve
- strength
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005259 measurement Methods 0.000 title abstract description 12
- 238000003763 carbonization Methods 0.000 claims abstract description 14
- 238000010276 construction Methods 0.000 claims abstract description 8
- 238000000034 method Methods 0.000 claims description 22
- 230000002159 abnormal effect Effects 0.000 claims description 7
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 238000011161 development Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 12
- 238000005516 engineering process Methods 0.000 abstract 1
- 238000013178 mathematical model Methods 0.000 description 11
- 238000012360 testing method Methods 0.000 description 11
- 238000004364 calculation method Methods 0.000 description 6
- 244000241872 Lycium chinense Species 0.000 description 4
- 235000015468 Lycium chinense Nutrition 0.000 description 4
- 238000012937 correction Methods 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 230000008030 elimination Effects 0.000 description 2
- 238000003379 elimination reaction Methods 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002344 surface layer Substances 0.000 description 2
- 238000002604 ultrasonography Methods 0.000 description 2
- 239000004568 cement Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000246 remedial effect Effects 0.000 description 1
- 102220023217 rs387907538 Human genes 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/40—Investigating hardness or rebound hardness
- G01N3/52—Investigating hardness or rebound hardness by measuring extent of rebound of a striking body
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/44—Processing the detected response signal, e.g. electronic circuits specially adapted therefor
- G01N29/4409—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison
- G01N29/4418—Processing the detected response signal, e.g. electronic circuits specially adapted therefor by comparison with a model, e.g. best-fit, regression analysis
-
- 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; ceramics; glass; bricks
- G01N33/383—Concrete, cement
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/0202—Control of the test
- G01N2203/0212—Theories, calculations
- G01N2203/0218—Calculations based on experimental data
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0232—Glass, ceramics, concrete or stone
Abstract
The invention belongs to the field of quality detection of construction engineering, and relates to a nondestructive detection technology for engineering structure and member concrete quality (including concrete compressive strength, concrete surface hardening, carbonization degree and concrete internal ultrasonic velocity). The common quality parameters of concrete are used to construct a ternary strength measurement curve, which is used for rapid, scientific and accurate nondestructive detection of on-site structure and member concrete, and estimation of actual compressive strength and working capacity with durability of the concrete.
Description
The first, patent field:
in construction engineering practice, the concrete compressive strength value of a main body structure is detected, the purpose is to determine whether the concrete material strength of the main body structure meets design requirements or not, and whether the requirement of safe use is satisfied or not, the structural concrete compressive strength value is an important technical index for acceptance of engineering quality, and a 'concrete ternary strength measurement curve' is a detection method for the concrete compressive strength value of the main body structure. Therefore, the detection method is suitable for detecting the compressive strength of concrete and the internal quality condition of the concrete in the field of construction engineering, and provides a technical method for providing concrete quality information for completion acceptance of engineering.
Second, technical background
At present, the domestic detection methods for the compressive strength value and the internal quality condition of concrete are customarily summarized into three types: 1. a damage method (the detected concrete is completely crushed to obtain a limit compressive strength value, the detected concrete can not be used after being repaired, and the method can not detect the internal quality condition of the concrete); 2. a semi-damage method (the detected concrete is partially damaged and can be recovered for use after being repaired, and the method cannot detect the internal quality condition of the concrete); 3. the invention discloses a full nondestructive method (the detected concrete is not damaged or only has local fine surface layer damage, the whole integrity of a concrete structure is not influenced without repairing, the detected concrete can still be continuously used, and the method can detect the internal quality condition of the concrete).
At present, the nondestructive testing method for the compressive strength value of concrete is only three in China: 1. by the "rebound-carbonation depth method", or R-N-dmMethod, 2, is "rebound-ultrasound method", or R-N-V method, 3, ultrasound method, or R-V method, [ note: r-represents the compressive strength of concrete, MPa; n-represents the rebound value, dm-Carbonization depth value, mm; v-ultrasonic velocity, Km/S;]all three methods belong to the 'one-dimensional or two-dimensional strength measurement curve method', namely that the compression strength value of concrete is established on one or two physical parameters. In long-term engineering quality detection practice, the binary strength measurement curve causes great disputes to the detection result of the compressive strength of the abnormally carbonized concrete, and a plurality of domestic professors and scholars think that: at present, the unary and binary complete lossless detection method cannot be directly used for detecting the compression strength value of abnormally carbonized concrete. In the engineering quality detection practice, a 'concrete ternary strength curve measuring method' is created and invented, the technical problem of quality detection of abnormally carbonized concrete wall surfaces and columns is solved, and the method can be used for more scientifically and accurately detecting normally carbonized concrete members.
Third, the invention
1. Selecting concrete members with construction period within one year according to different development laws of normal carbonized concrete and abnormal carbonized concrete, and selecting limit value d of abnormal carbonizationm≥4.5mm；
2. Establishing the compression strength value of the detected concrete at a rebound value N and a carbonization depth value dmAnd a penetration ultrasonic value V.
3. By dmAnd v, judging the internal quality condition of the concrete by using the two physical parameters.
Fourthly, the implementation step
Detailed description of the preferred embodiments (ternary Strength measurement curves for abnormally carbonized concrete are exemplified)
Step 1, collecting or specially manufacturing the resilience value R of a test block which is identical to the member concrete in conditionmDepth of carbonization dmUltrasonic velocity value ViGenerally, less than 10 groups of data are not suitable, and the data under the standard conditions are recorded in detail, archived and stored.
Step 2, analyzing and sorting the standard data in step 1, establishing a ternary normal equation of the number of the seno, solving the number of the seno by a negation method, and establishing f ═ a 'Rm + b' dm+C’Vi+ D' initial trial (mathematical) model.
Step 3, performing error analysis on the initial mathematical model, and determining a ternary strength measurement curve equation with practical value, namely f ═ aRm + bdm+CVi+D。
Average relative error of mathematical model when starting ternary curve
When the relative standard deviation e is larger than the national specified value, the error of the mathematical model is explained except for Rm、dm、ViIn addition to three factors, other random factors have an influence on the test result, so that R is excludedm、dm、ViInfluence of other random factors except the three factors on the test result, namely, the initial mathematical model is accurately corrected by using the residual values of all points to form a ternary test curve with practical value, if the mathematical model of the initial ternary curve
And the value of e meets the national standard requirement on the error value of the intensity measuring curve, and correction can not be carried out.
Fifth, application example
5.1 creation of ternary Curve
a ', b ', C ', - -represent R in the initial mathematical modelm、dm、ViCoefficient of (2)；
D' - - - - - - - - - - - -constant term in the initial mathematical model;
a, b, C- - -R in practical ternary intensity measuring curvem、dm、ViThe number of lines;
d-constant item in the practical ternary intensity measuring curve;
delta-sigma ternary intensity curve calculated value fMeterAn actual measurement value fFruit of Chinese wolfberry]Measured value and order fFruit of Chinese wolfberryCalculated value of f ═ f)
5.2 coefficient correction value:
∑(Y1' one YFruit of Chinese wolfberry)＝＝139；∑Y’＝＝668.2；
The coefficients of the ternary intensity curve are modified as follows:
∑(fmeterA fFruit of Chinese wolfberry)/ΣfMeter＝139/668.2＝+0.2019762
fMeter、fFruit of Chinese wolfberry- - - -ternary Strength measurement Curve as Rm、dm、ViCoefficient calculation value and Rm、dm、ViCorresponding actual intensity values;
Rm、dm、Vithe standard rebound value, the carbonization depth value and the ultrasonic velocity value are respectively used as the raw material;
Y1' and Y-are respectively calculated value and measured value of concrete strength of the initial mathematical model (Y ═ f-Fruit of Chinese wolfberry)；
a＝(1-0.2019672)xa’＝.8x1.451＝1.16≈1.2；
In the same theory, b is 1.5; c is 4.3; d ═ 22.5
Practical ternary intensity measurement curve equation: f is 1.2Rm-1.5dm+4.3Vi-22.5; error analysis according to national regulations:
average relative error thereof
And (4) recording:
relative standard deviation thereof
In the formula: e represents the relative standard deviation% of the fit equation;
fcu，lactual test values representing the curves;
fc cu，lrepresents the theoretical calculation of the ternary curve;
n represents the number of times of formulating equation test data;
e＝1/(15-1)xΔ2x100＝[1/14x0.0437]1/2x100＝5.587％＝5.59％≤14％
and through error calculation, the ternary strength measurement curve meets the use requirement.
5.3, practical application
Example 1: measuring rebound value R of shear wall slab concrete in certain construction site by rebound methodm36.5, carbonization depth dmThe concrete strength f is estimated to be 30.5 by looking up the table for 5mm,
when the wave velocity detected by ultrasonic wave is V4.25, the ternary curve calculates the estimated concrete strength f 32.1
The compression resistance value of the in-situ indwelling specimen is 34.5MPa,
the abnormal carbonization of the concrete of the member is caused by dehydration in the watering curing period, and the internal quality of the concrete is uniform and compact.
Example 2: concrete column of certain construction site, rebound value Rm34.2, carbonization depth dmThe concrete strength f is estimated to be 26.2MPa by looking up the table when the concrete thickness is 5.5mm,
ultrasonic wave detection wave velocity Vi4.58, ternary curve calculation estimationThe strength f of the concrete is 29.997MPa,
the compression resistance value of the on-site indwelling coculture test piece is 31.2MPa,
the abnormal carbonization of the concrete of the member of this example is the decrease of alkalinity caused by the secondary hydration reaction of the mixed material during the watering and curing period, and the internal structure of the concrete is denser.
Example 3: shear wall of a certain construction site, rebound value Rm35.2, the carbonization depth is 4.8mm, and the concrete strength f is estimated to be 28.8MPa by table lookup;
detected ultrasonic velocity Vi3.75, and the strength f of the concrete calculated by the ternary curve is 27.7 MPa;
maintaining the compressive strength of the test piece to be 36.5MPa under the same conditions in a field reserving mode;
in the case of abnormal carbonization of the concrete member, the hydration reaction is stopped by dehydration of the cement, the surface layer is neutralized, the interior is not dense, and remedial measures should be taken.
The specific calculation table is as follows:
Y’＝-28.17929+1.4505Rm-1.8793dm+5.3836V
the practical number of the ternary curve equation is obtained by solving the initial mathematical model through calculation by a substitution elimination method, residual correction and the like, wherein the number of the practical ternary curve equation is respectively equal to 1.1575 and equal to 1.2, and the number of the practical ternary curve equation is equal to-1.49968 and equal to 1.5; c is 4.2961 ≈ 4.3; d is-22.487 ≈ 22.5;
then establishing a three-element test curve equation with practical value: f is 1.2Rm-1.5dm+4.3Vi-22.5：Y---＝＝1/15x550.2＝＝＝36.68 X1 ---＝＝1/15x594.2＝＝＝63.6133
X2 ----＝＝1/15x43＝＝＝2.86666667 X3 ----＝＝＝1/15x61.36＝＝＝4.091 X3 -1/15x53.87＝3.59
L11＝＝23915.8-1/15x594.2x594.2＝＝377.5573 L12＝＝L21＝＝1688.7-1/15x594.2x43＝＝--14.673 L13＝＝2445.272-1/15x594.2x61.36＝＝14.5979；
L13＝＝2152.398-1/15x594.2.x53.87＝＝18.4277
L1y＝＝22449.08-1/15x594.2x550.2＝＝653.824 L22＝＝177-1/15x43x43＝＝53.7333 L23＝＝172.215-1/15x43x61.36＝＝--3.68367
L23＝＝155.055-1/15x43x53.87＝0.6277
L2y＝＝1435.15-1/15x43x550.2＝＝--142.09 L33＝＝252.0128-1/15x61.36x61.36＝＝1.0095
L3y＝＝2284.218-1/15x61.36x550.2＝＝33.5332 L3y＝＝2006.753-1/15x53.87x550.2＝＝30.8014
L33＝＝195.211-1/15x53.87x53.87＝＝1.74587
Initial mathematical model variance: s2＝1294.2/[15-1-3]＝117.6545，S＝10.847，
eFirst stage＝[1/14x1.1429]0.5X100＝28.572％，
The practical ternary test curve variance after the influence of external non-independent variable factors is eliminated is as follows:
S3 2＝144.43/11＝13.13，S3＝3.624，
e3＝[1/14X0.0964]1/2X100＝8.29％，
elimination of non-independent variables (divide by R) in the initial mathematical modelm、dm、ViExternal) factor, the test accuracy improvement value: relative mean error reduction (1-6.13/26.9) x 100-0.772 x 100-77.2% relative standard deviation reduction (1-8.3/28.6) x 100-70.98%, overall variance reduction: (1-3.624/10.85) x100 ═ 66.6%.
Claims (1)
1. The method for measuring the three-element strength curve of the concrete is characterized in that:
(1) selecting concrete members with construction period within one year according to different development laws of normal carbonized concrete and abnormal carbonized concrete, and selecting limit value d of abnormal carbonizationm≥4.5mm；
(2) Establishing the compression strength value of the detected concrete at a rebound value N and a carbonization depth value dmAnd the opposite-penetrating ultrasonic value V;
(3) by dmAnd v, judging the internal quality condition of the concrete by using the two physical parameters.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910835729.3A CN112432872A (en) | 2019-08-26 | 2019-08-26 | Ternary strength measurement curve of concrete |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910835729.3A CN112432872A (en) | 2019-08-26 | 2019-08-26 | Ternary strength measurement curve of concrete |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112432872A true CN112432872A (en) | 2021-03-02 |
Family
ID=74689875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910835729.3A Pending CN112432872A (en) | 2019-08-26 | 2019-08-26 | Ternary strength measurement curve of concrete |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112432872A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1712961A (en) * | 2005-06-29 | 2005-12-28 | 贵州中建建筑科研设计院 | Method for determining compression strength of sand concrete by supersonic resilience comprehensively |
| US20130091952A1 (en) * | 2011-10-17 | 2013-04-18 | Hee Seok Kim | Apparatus For Measuring Concrete Strength And Slip Form Method For Constructing Vertical Concrete Column Member Using Surface Wave Velocity Measurement Device |
| CN104834771A (en) * | 2015-04-23 | 2015-08-12 | 东南大学 | Method for establishing strength measurement curve of concrete with high-volume mineral admixtures |
-
2019
- 2019-08-26 CN CN201910835729.3A patent/CN112432872A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1712961A (en) * | 2005-06-29 | 2005-12-28 | 贵州中建建筑科研设计院 | Method for determining compression strength of sand concrete by supersonic resilience comprehensively |
| US20130091952A1 (en) * | 2011-10-17 | 2013-04-18 | Hee Seok Kim | Apparatus For Measuring Concrete Strength And Slip Form Method For Constructing Vertical Concrete Column Member Using Surface Wave Velocity Measurement Device |
| CN104834771A (en) * | 2015-04-23 | 2015-08-12 | 东南大学 | Method for establishing strength measurement curve of concrete with high-volume mineral admixtures |
Non-Patent Citations (2)
| Title |
|---|
| 刘梦溪;周国庆;卢雷;徐晓琴;: "无损伤测定混凝土强度区域性应用研究", 混凝土, no. 03, 27 March 2009 (2009-03-27), pages 102 - 107 * |
| 张海伟;蔡庆晓;李统彬;: "地区泵送混凝土超声回弹综合法测强曲线的建立", 广东建材, no. 02, 20 February 2009 (2009-02-20), pages 104 - 106 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2020228386A1 (en) | Method for identifying crack initiation stress of rock using acoustic emission technology | |
| CN108106938A (en) | It is a kind of to test the method for determining that acid solution influences dense carbonate Young's modulus | |
| CN110095274B (en) | Steel trestle static load test evaluation method considering inelastic deformation | |
| CN101303329A (en) | Integrated strength testing method based on neural network technology | |
| CN104777218A (en) | Method for determining ferromagnetic material crack generation by metal magnetic memory detection technology | |
| CN102455263A (en) | Method for obtaining mechanical property of metal material based on load-depth curve | |
| CN106370812A (en) | Rock alteration zoning comprehensive quantitative discrimination method | |
| CN111551457A (en) | Method for testing and evaluating asphalt healing performance | |
| Gyurkó et al. | Specimen size and shape effect on the compressive strength of normal strength concrete | |
| CN110646119B (en) | Method for measuring surface stress tensor of rolled metal material by ultrasonic wave | |
| CN105806951A (en) | Ultrasonic inspection technology of large-size austenitic stainless steel forge pieces and application of ultrasonic inspection technology | |
| CN109323921B (en) | Method for rapidly testing fracture toughness resistance curve of metal material | |
| Závacký et al. | Strains of rock during uniaxial compression test | |
| CN112432872A (en) | Ternary strength measurement curve of concrete | |
| CN113536924A (en) | Method for detecting internal damage type of steel fiber concrete structure | |
| CN111767664A (en) | Method for determining plane strain fracture toughness of metal material based on energy release rate | |
| CN109696355B (en) | Method for measuring long-term tensile strength of bamboo wood with recombined composite structure | |
| CN110991824A (en) | Method and device for identifying coal rock impact tendency and storage medium | |
| Zhao et al. | Estimation of elastic modulus of rock using modified point-load test | |
| CN111199089B (en) | Method and device for analyzing reliability and sensitivity of pipeline circumferential weld | |
| CN112033842A (en) | On-site nondestructive testing method for concrete split tensile strength | |
| CN115326565B (en) | Rock material stress threshold value calculation method based on energy difference in loading process | |
| Pengfei et al. | A volumetric strain-based method to determine crack initiation stress of low-porosity rocks | |
| CN108931576B (en) | Concrete structure elastic modulus detection method based on drill core sampling impact echo | |
| CN108802196B (en) | Concrete prism test block static elastic modulus detection method based on impact echo |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| TA01 | Transfer of patent application right | ||
| TA01 | Transfer of patent application right |
Effective date of registration: 20210713 Address after: No.28 tiyuan Road, Yuhua District, Changsha, Hunan 410000 Applicant after: Hunan Changheng Engineering Quality Inspection Co.,Ltd. Address before: No. 805, unit 3, building C, Chuanzihe Binhu Mingyuan, Wuling District, Changde City, Hunan Province, 415000 Applicant before: Zhu Weiguang |