CN111829869A - Special strength measuring curve for detecting concrete compressive strength by resilience method - Google Patents
Special strength measuring curve for detecting concrete compressive strength by resilience method Download PDFInfo
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- CN111829869A CN111829869A CN202010616458.5A CN202010616458A CN111829869A CN 111829869 A CN111829869 A CN 111829869A CN 202010616458 A CN202010616458 A CN 202010616458A CN 111829869 A CN111829869 A CN 111829869A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000012360 testing method Methods 0.000 claims abstract description 129
- 238000005259 measurement Methods 0.000 claims abstract description 27
- 238000003763 carbonization Methods 0.000 claims abstract description 22
- 238000004519 manufacturing process Methods 0.000 claims abstract description 13
- 238000012423 maintenance Methods 0.000 claims abstract description 7
- 238000004364 calculation method Methods 0.000 abstract description 6
- 238000001514 detection method Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000009863 impact test Methods 0.000 abstract 1
- 230000010354 integration Effects 0.000 abstract 1
- 239000004568 cement Substances 0.000 description 11
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 230000004075 alteration Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- 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
- G01N3/02—Details
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- 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
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
-
- 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
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention provides a special strength measurement curve for detecting the compressive strength of concrete by a rebound method, which comprises the following steps: the method comprises the following steps of test block manufacturing, test block maintenance, load application, impact test, average rebound value calculation, continuous loading, carbonization depth value measurement and data integration. The beneficial effects are that: the special strength measurement curve for detecting the compressive strength of the concrete by the rebound method is used for preparing a regression equation, namely the strength measurement curve, according to the functional relation between the rebound value of the concrete test block and the carbonization depth of the concrete test block, so that the compressive strength of the concrete test block is calculated more quickly, the data value required to be detected in the test is reduced, and the compressive strength detection efficiency of the concrete is improved.
Description
Technical Field
The invention relates to the technical field of concrete detection, in particular to a special strength measuring curve for detecting the compressive strength of concrete by a rebound method.
Background
One of the main indexes of concrete quality is compressive strength, which is proportional to the strength of cement used for concrete, and calculated according to a formula, when the water cement ratio is equal, the compressive strength of concrete prepared by high-grade cement is much higher than that of concrete prepared by low-grade cement. Generally, the water cement ratio is inversely proportional to the concrete strength, and when the water cement ratio is not changed, the concrete strength is improved by increasing the cement dosage, and only the concrete workability can be improved, and the shrinkage and deformation of the concrete are increased. Therefore, the main factors influencing the compressive strength of concrete are the cement strength and the water cement ratio, and the control of the concrete quality is required, and most importantly, the control of the cement quality and the water cement ratio of the concrete is required to be two main links. In addition, there are other factors that affect the strength of concrete that are not negligible.
In the prior art, the strength of concrete is tested and evaluated according to the result of a concrete test piece compressive strength test, a plurality of data values such as the average value of the strength of the same acceptance batch of concrete, the compressive strength, the designed standard value of the strength of concrete, the minimum value of the strength of the same acceptance batch of concrete, the standard value of the strength of the same acceptance batch of concrete, the square of the average value of the strength of the same acceptance batch of concrete and the like are required in the calculation process, the calculation steps are complicated, and the calculation time consumption is long.
Disclosure of Invention
The invention aims to provide a special strength measurement curve for detecting the compressive strength of concrete by a rebound method so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: the special strength measurement curve for detecting the compressive strength of the concrete by the rebound method comprises the following steps:
s1: manufacturing test blocks, namely designing 5 strength grades according to the optimal mixing ratio, and manufacturing 3-6 test blocks respectively at different ages of each strength grade;
s2: maintaining the test block, namely after the test block prepared in the step S1 is molded for 24 hours, moving the test block to the condition the same as that of the tested member for maintenance;
s3: applying a load, wiping the surface of the test block, placing two opposite surfaces of the pouring side surface between an upper pressure bearing plate and a lower pressure bearing plate of a press machine, and pressurizing (60-100) kN (taking a low value for a low-strength test piece);
s4: performing flick test, namely flicking 8-12 points on two side surfaces of a test block respectively according to an operation method specified by a specification under the condition that the test block keeps pressure;
s5: calculating an average springback value, and respectively removing 3 maximum values and 3 minimum values from the springback values of each test block, and taking the average value of the rest springback values as the average springback value Rm of the test block;
s6: continuously loading, loading the test block until the test block is damaged, and calculating the compressive strength value fcu (MPa) of the test block;
s7: measuring the carbonization depth value, and measuring the average carbonization depth value of the test block at the edge of the damaged test block according to the specification;
s8: and integrating data, and establishing a functional relation (namely a regression equation) among the compressive strength value, the rebound value and the carbonization depth according to the data, wherein the regression equation (functional curve) is a unified strength measurement curve.
Preferably, in the first step, the test block is a cube with a side length of 150 mm.
Preferably, in the second step, the stripping date of the test block is preferably the same as the stripping date of the member.
Preferably, in step five, the average is calculated to the nearest 0.1 MPa.
Preferably, in the sixth step, the compressive strength value is accurate to 0.1 MPa.
Compared with the prior art, the invention has the beneficial effects that: the special strength measurement curve for detecting the compressive strength of the concrete by the rebound method is used for preparing a regression equation, namely the strength measurement curve, according to the functional relation between the rebound value of the concrete test block and the carbonization depth of the concrete test block, so that the compressive strength of the concrete test block is calculated more quickly, the data value required to be detected in the test is reduced, and the compressive strength detection efficiency of the concrete is improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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.
Example one
The invention provides a technical scheme that: the special strength measurement curve for detecting the compressive strength of the concrete by the rebound method comprises the following steps:
s1: manufacturing test blocks, namely designing 5 strength grades according to the optimal mixing ratio, and manufacturing 3 test blocks respectively at different ages of each strength grade;
s2: maintaining the test block, namely after the test block prepared in the step S1 is molded for 24 hours, moving the test block to the condition the same as that of the tested member for maintenance;
s3: applying load, wiping the surface of the test block, placing two opposite surfaces of the pouring side surface between an upper pressure bearing plate and a lower pressure bearing plate of a press machine, and pressurizing for 60 kN;
s4: performing flick test, namely flicking 8 points on two side surfaces of a test block respectively according to an operation method specified by a specification under the condition that the test block keeps pressure;
s5: calculating an average springback value, and respectively removing 3 maximum values and 3 minimum values from the springback values of each test block, and taking the average value of the rest springback values as the average springback value Rm of the test block;
s6: continuously loading, loading the test block until the test block is damaged, and calculating the compressive strength value fcu (MPa) of the test block;
s7: measuring the carbonization depth value, and measuring the average carbonization depth value of the test block at the edge of the damaged test block according to the specification;
s8: and integrating data, and establishing a functional relation (namely a regression equation) among the compressive strength value, the rebound value and the carbonization depth according to the data, wherein the regression equation (functional curve) is a unified strength measurement curve.
In the first step, the test block is a cube with the side length of 150 mm; in the second step, the stripping date of the test block is preferably the same as that of the component; in the fifth step, the average value is accurately calculated to 0.1 MPa; and sixthly, the compressive strength value is accurate to 0.1 MPa.
Example two
The invention provides a technical scheme that: the special strength measurement curve for detecting the compressive strength of the concrete by the rebound method comprises the following steps:
s1: manufacturing test blocks, namely designing 5 strength grades according to the optimal mixing ratio, and manufacturing 6 test blocks respectively according to different ages of each strength grade;
s2: maintaining the test block, namely after the test block prepared in the step S1 is molded for 24 hours, moving the test block to the condition the same as that of the tested member for maintenance;
s3: applying load, wiping the surface of the test block, placing two opposite surfaces of the pouring side surface between an upper pressure bearing plate and a lower pressure bearing plate of a press machine, and pressurizing by 100kN (taking a low value for a low-strength test piece);
s4: performing flick test, namely flicking 12 points on two side surfaces of a test block respectively according to an operation method specified by a specification under the condition that the test block keeps pressure;
s5: calculating an average springback value, and respectively removing 3 maximum values and 3 minimum values from the springback values of each test block, and taking the average value of the rest springback values as the average springback value Rm of the test block;
s6: continuously loading, loading the test block until the test block is damaged, and calculating the compressive strength value fcu (MPa) of the test block;
s7: measuring the carbonization depth value, and measuring the average carbonization depth value of the test block at the edge of the damaged test block according to the specification;
s8: and integrating data, and establishing a functional relation (namely a regression equation) among the compressive strength value, the rebound value and the carbonization depth according to the data, wherein the regression equation (functional curve) is a unified strength measurement curve.
In the first step, the test block is a cube with the side length of 150 mm; in the second step, the stripping date of the test block is preferably the same as that of the component; in the fifth step, the average value is accurately calculated to 0.1 MPa; and sixthly, the compressive strength value is accurate to 0.1 MPa.
EXAMPLE III
The invention provides a technical scheme that: the special strength measurement curve for detecting the compressive strength of the concrete by the rebound method comprises the following steps:
s1: manufacturing test blocks, namely designing 5 strength grades according to the optimal mixing ratio, and manufacturing 4 test blocks respectively at different ages of each strength grade;
s2: maintaining the test block, namely after the test block prepared in the step S1 is molded for 24 hours, moving the test block to the condition the same as that of the tested member for maintenance;
s3: applying load, wiping the surface of the test block, placing two opposite surfaces of the pouring side surface between an upper pressure bearing plate and a lower pressure bearing plate of a press machine, and pressurizing by 70kN (taking a low value for a low-strength test piece);
s4: performing flick test, namely flicking 10 points on two side surfaces of a test block respectively according to an operation method specified by a specification under the condition that the test block keeps pressure;
s5: calculating an average springback value, and respectively removing 3 maximum values and 3 minimum values from the springback values of each test block, and taking the average value of the rest springback values as the average springback value Rm of the test block;
s6: continuously loading, loading the test block until the test block is damaged, and calculating the compressive strength value fcu (MPa) of the test block;
s7: measuring the carbonization depth value, and measuring the average carbonization depth value of the test block at the edge of the damaged test block according to the specification;
s8: and integrating data, and establishing a functional relation (namely a regression equation) among the compressive strength value, the rebound value and the carbonization depth according to the data, wherein the regression equation (functional curve) is a unified strength measurement curve.
In the first step, the test block is a cube with the side length of 150 mm; in the second step, the stripping date of the test block is preferably the same as that of the component; in the fifth step, the average value is accurately calculated to 0.1 MPa; and sixthly, the compressive strength value is accurate to 0.1 MPa.
Example four
The invention provides a technical scheme that: the special strength measurement curve for detecting the compressive strength of the concrete by the rebound method comprises the following steps:
s1: manufacturing test blocks, namely designing 5 strength grades according to the optimal mixing ratio, and manufacturing 6 test blocks respectively according to different ages of each strength grade;
s2: maintaining the test block, namely after the test block prepared in the step S1 is molded for 24 hours, moving the test block to the condition the same as that of the tested member for maintenance;
s3: applying load, wiping the surface of the test block, placing two opposite surfaces of the pouring side surface between an upper pressure bearing plate and a lower pressure bearing plate of a press machine, and pressurizing for 90kN (taking a low value for a low-strength test piece);
s4: performing flick test, namely flicking 8 points on two side surfaces of a test block respectively according to an operation method specified by a specification under the condition that the test block keeps pressure;
s5: calculating an average springback value, and respectively removing 3 maximum values and 3 minimum values from the springback values of each test block, and taking the average value of the rest springback values as the average springback value Rm of the test block;
s6: continuously loading, loading the test block until the test block is damaged, and calculating the compressive strength value fcu (MPa) of the test block;
s7: measuring the carbonization depth value, and measuring the average carbonization depth value of the test block at the edge of the damaged test block according to the specification;
s8: and integrating data, and establishing a functional relation (namely a regression equation) among the compressive strength value, the rebound value and the carbonization depth according to the data, wherein the regression equation (functional curve) is a unified strength measurement curve.
In the first step, the test block is a cube with the side length of 150 mm; in the second step, the stripping date of the test block is preferably the same as that of the component; in the fifth step, the average value is accurately calculated to 0.1 MPa; and sixthly, the compressive strength value is accurate to 0.1 MPa.
The four groups of embodiments can obtain the special strength measurement curve for the compressive strength of the concrete, and compared with the traditional calculation method for the compressive strength of the concrete, the calculation speed for detecting the special strength measurement curve for the compressive strength of the concrete by the springback method is high, and the required experimental data value is small.
The invention has the advantages that: the special strength measurement curve for detecting the compressive strength of the concrete by the rebound method is used for preparing a regression equation, namely the strength measurement curve, according to the functional relation between the rebound value of the concrete test block and the carbonization depth of the concrete test block, so that the compressive strength of the concrete test block is calculated more quickly, the data value required to be detected in the test is reduced, and the compressive strength detection efficiency of the concrete is improved.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The special strength measurement curve for detecting the compressive strength of the concrete by the rebound method is characterized by comprising the following steps of:
s1: manufacturing test blocks, namely designing 5 strength grades according to the optimal mixing ratio, and manufacturing 3-6 test blocks respectively at different ages of each strength grade;
s2: maintaining the test block, namely after the test block prepared in the step S1 is molded for 24 hours, moving the test block to the condition the same as that of the tested member for maintenance;
s3: applying a load, wiping the surface of the test block, placing two opposite surfaces of the pouring side surface between an upper pressure bearing plate and a lower pressure bearing plate of a press machine, and pressurizing (60-100) kN (taking a low value for a low-strength test piece);
s4: performing flick test, namely flicking 8-12 points on two side surfaces of a test block respectively according to an operation method specified by a specification under the condition that the test block keeps pressure;
s5: calculating an average springback value, and respectively removing 3 maximum values and 3 minimum values from the springback values of each test block, and taking the average value of the rest springback values as the average springback value Rm of the test block;
s6: continuously loading, loading the test block until the test block is damaged, and calculating the compressive strength value f cu (MPa) of the test block;
s7: measuring the carbonization depth value, and measuring the average carbonization depth value of the test block at the edge of the damaged test block according to the specification;
s8: and integrating data, and establishing a functional relation (namely a regression equation) among the compressive strength value, the rebound value and the carbonization depth according to the data, wherein the regression equation (functional curve) is a unified strength measurement curve.
2. The special strength measurement curve for detecting the compressive strength of concrete by the rebound method according to claim 1, which is characterized in that: in the first step, the test block is a cube with the side length of 150 mm.
3. The special strength measurement curve for detecting the compressive strength of concrete by the rebound method according to claim 1, which is characterized in that: in the second step, the stripping date of the test block is preferably the same as that of the component.
4. The special strength measurement curve for detecting the compressive strength of concrete by the rebound method according to claim 1, which is characterized in that: in the fifth step, the average value is calculated to be accurate to 0.1 MPa.
5. The special strength measurement curve for detecting the compressive strength of concrete by the rebound method according to claim 1, which is characterized in that: and sixthly, the compressive strength value is accurate to 0.1 MPa.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112906234A (en) * | 2021-03-09 | 2021-06-04 | 廊坊市阳光建设工程质量检测有限公司 | Method for measuring strength curve data regression by concrete strength rebound method |
| CN113155614A (en) * | 2021-04-25 | 2021-07-23 | 张启志 | Concrete compressive strength detection method and system based on similarity determination |
| CN113702223A (en) * | 2021-09-17 | 2021-11-26 | 武汉路源工程质量检测有限公司 | Method and system for detecting compressive strength of concrete member based on rebound method |
| CN114088560A (en) * | 2021-11-05 | 2022-02-25 | 国网山东省电力公司经济技术研究院 | Method and system for testing strength of centrifugal annular electric pole |
| CN114878384A (en) * | 2022-07-08 | 2022-08-09 | 中铁十八局集团第四工程有限公司 | Concrete strength testing device and method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112906234A (en) * | 2021-03-09 | 2021-06-04 | 廊坊市阳光建设工程质量检测有限公司 | Method for measuring strength curve data regression by concrete strength rebound method |
| CN113155614A (en) * | 2021-04-25 | 2021-07-23 | 张启志 | Concrete compressive strength detection method and system based on similarity determination |
| CN113155614B (en) * | 2021-04-25 | 2023-07-28 | 张启志 | Concrete compressive strength detection method and system based on similarity judgment |
| CN113702223A (en) * | 2021-09-17 | 2021-11-26 | 武汉路源工程质量检测有限公司 | Method and system for detecting compressive strength of concrete member based on rebound method |
| CN113702223B (en) * | 2021-09-17 | 2023-12-22 | 武汉路源工程质量检测有限公司 | Method and system for detecting compressive strength of concrete member based on rebound method |
| CN114088560A (en) * | 2021-11-05 | 2022-02-25 | 国网山东省电力公司经济技术研究院 | Method and system for testing strength of centrifugal annular electric pole |
| CN114088560B (en) * | 2021-11-05 | 2024-02-09 | 国网山东省电力公司经济技术研究院 | Method and system for testing strength of centrifugal annular electric pole |
| CN114878384A (en) * | 2022-07-08 | 2022-08-09 | 中铁十八局集团第四工程有限公司 | Concrete strength testing device and method |
| CN114878384B (en) * | 2022-07-08 | 2022-11-04 | 中铁十八局集团第四工程有限公司 | Concrete strength testing device and method |
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