CN112213215A - Method for detecting compressive strength of concrete through combined resilience - Google Patents
Method for detecting compressive strength of concrete through combined resilience Download PDFInfo
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- CN112213215A CN112213215A CN202010909672.XA CN202010909672A CN112213215A CN 112213215 A CN112213215 A CN 112213215A CN 202010909672 A CN202010909672 A CN 202010909672A CN 112213215 A CN112213215 A CN 112213215A
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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
- G01N3/40—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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- 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
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- 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
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- G01N2203/0076—Hardness, compressibility or resistance to crushing
- G01N2203/0083—Rebound strike or reflected energy
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention relates to a method for detecting concrete compressive strength by combined resilience, which uses two resiliometers for impact energy to detect, namely a 4.5J high-strength resiliometer for impact energy and a 2.207J medium-sized resiliometer for impact energy, and comprises the following steps: step 1, establishing a matrix of medium-sized resiliometer measuring points and high-strength resiliometer measuring points on a concrete member to be measured; step 2, carrying out data detection on the high-strength resiliometer measuring points and the medium-type resiliometer measuring points of the matrix; step 3, collecting the detected data and screening the collected data; step 4, establishing a structural concrete combined resilience method strength measurement curve applicable to the strength range of 20.0MPa to 100.0MPa according to the screened data; the medium-sized resiliometer and the high-strength resiliometer are combined to perform rebound detection on the compressive strength of the concrete, so that rebound method detection in the same detection area by using resiliometers with two energies is realized, and the detection precision of the compressive strength of the concrete is improved.
Description
Technical Field
The invention belongs to the field of concrete strength detection, and particularly relates to a method for detecting the compressive strength of concrete through combined resilience.
Background
The compressive strength is an important performance parameter of concrete, and is directly related to the overall quality safety of concrete members and even engineering construction. The concrete member has the characteristics that the concrete member can meet the corresponding requirement on the compressive strength of different engineering parts, so that the detection of the compressive strength of the concrete is very important work.
The prior art method for detecting the compressive strength of concrete comprises the following steps:
(1) a shearing and pressing method: applying pressure perpendicular to the pressure bearing surface to the right-angle side of the concrete member according to a shear-compression instrument to enable the right-angle side of the concrete member to generate local shear-compression damage, and estimating the compressive strength of the concrete member according to the shear pressure at the moment; (2) core drilling method: drilling a concrete test piece on the concrete member, processing the concrete test piece into a standard core sample, and detecting the compressive strength of the standard core sample on a pressure testing machine; (3) a rebound method: presume the compressive strength of the concrete member according to the relation between hardness and intensity of the concrete member surface; (4) ultrasonic rebound synthesis method: the method estimates the compressive strength of the concrete according to the hardness of the surface of the concrete member and the ultrasonic wave velocity in the concrete member; (5) post-anchoring method: the method estimates the compressive strength of the concrete according to the pulling-out force of the concrete member damaged by a post-anchoring method within the range of 30mm of the surface layer of the concrete member; (6) a pull-off method: the method is a method for opening an annular groove on the surface of a concrete test piece by using a slotting device, carrying out a pulling test by using a pulling device, and then carrying out detection by collecting pulling data of the pulling device.
The concrete resiliometers applied to the rebound method of the method for detecting the compressive strength of concrete in the prior art are mainly classified into two types: medium and high strength. The two types of rebound apparatus have different energy and different application range. At present, the method for detecting the strength of concrete with different strength ranges by using a resilience standard is tried to be explored at home and abroad. In recent years, the patented products studied by PROCIC of switzerland: it is also an effort to solve the problem of concrete rebound detection from the range C15-C100. However, the application of the resiliometer in China can find that when the strength of concrete is higher than C70, the detection result of the resiliometer still has overlarge error and cannot meet the requirement.
For example, chinese patent No. 201410519659.8 discloses a method for establishing a concrete compressive strength curve, which uses a new standard ultrasonic rebound method to detect the concrete strength, and establishes a local special curve for detecting the concrete compressive strength by the ultrasonic rebound method through experiments and data statistical analysis, so as to obtain an ultrasonic rebound intensity detection regression formula, and the invention cannot solve the problem that the detection result error is too large when the concrete strength is higher than C70.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a method for detecting the compressive strength of concrete by combining resilience.
In order to achieve the technical purpose, the technical scheme of the invention is realized as follows:
the method for detecting the compressive strength of concrete by combined springback comprises the following steps:
step 1, establishing a matrix of a medium-sized resiliometer measuring point and a high-strength resiliometer measuring point on a concrete member to be measured by using a high-strength resiliometer and a medium-sized resiliometer;
step 2, carrying out data detection on the medium-sized resiliometer measuring points and the high-strength resiliometer measuring points of the matrix of the medium-sized resiliometer measuring points and the high-strength resiliometer measuring points;
step 3, collecting the detected data and screening the collected data;
and 4, establishing a strength measuring curve applicable to the structural concrete combination resilience method with the strength range of 20.0-100.0 MPa according to the screened data.
Further, the impact energy of the high-strength rebound apparatus in the step 1 is 4.5J, and the impact energy of the medium-sized rebound apparatus is 2.207J.
Further, the matrix in step 1 is a 4 × 4 matrix.
Furthermore, the number of the medium-sized rebound tester measuring points and the number of the high-strength rebound tester measuring points in the step 1 are both 8.
Furthermore, the medium-size rebound tester measuring points and the high-strength rebound tester measuring points in the step 1 are arranged at intervals.
Further, the matrix in the step 1 is a 4 × 4 matrix, and the width and the length of the matrix are both 200 mm.
Further, the collected data are screened in the step 3, and the maximum value and the minimum value of the rebound value measured by the medium-sized resiliometer and the rebound value measured by the high-strength resiliometer are respectively abandoned.
Further, the step 4 of establishing a strength measurement curve applicable to the structural concrete combination springback method with the strength range of 20.0 MPa-100.0 MPa according to the screened data comprises the following steps:
step 4.1, respectively calculating the average value of the rebound values measured by the medium-sized resiliometer and the average value of the rebound values measured by the high-strength resiliometer;
and 4.2, establishing a structural concrete combined springback method strength measurement curve applicable to the strength range of 20.0-100.0 MPa according to the average value of the springback values measured by the medium-sized resiliometers and the average value of the springback values measured by the high-strength resiliometers.
And 4.3, performing regression fitting by adopting a least square principle to obtain a combined springback method detected concrete compressive strength measuring curve, wherein the calculation formula of the combined springback method measured concrete strength curve suitable for the structural concrete with the strength range of 20.0-100.0 MPa is as follows:
in the calculation formula:
for conversion of concrete strength to value, RmThe average value, r, of the rebound values measured by the high-strength resiliometermA, B, C are all constants which are the average of the rebound values measured by the medium resiliometer.
The concrete strength detection method has the beneficial effects that:
1. according to the invention, the medium-sized resiliometer and the high-strength resiliometer are combined to resiliometer and detect the compressive strength of the concrete, so that the detection precision of the compressive strength of the concrete is improved.
2. The invention firstly proposes to use a combined resilience method to detect the concrete compressive strength within the range of 20.0MPa to 100.0 MPa.
3. The invention firstly provides that the rebound method detection is carried out in the same detection area by using the resiliometers with two energies.
Drawings
FIG. 1 is a flow chart of the method for detecting the compressive strength of concrete by combining resilience.
Fig. 2 is a layout diagram of the rebound test points of the test area of the combined rebound method.
Detailed Description
The technical scheme in the concrete strength detection embodiment of the present invention is further described in detail below with reference to the accompanying drawings in the embodiment of the present invention.
Example 1
The method for detecting the compressive strength of concrete by combined springback comprises the following steps:
step 1, establishing a matrix of a medium-sized resiliometer measuring point and a high-strength resiliometer measuring point on a concrete member to be measured by using a high-strength resiliometer and a medium-sized resiliometer;
step 2, carrying out data detection on the medium-sized resiliometer measuring points and the high-strength resiliometer measuring points of the matrix of the medium-sized resiliometer measuring points and the high-strength resiliometer measuring points;
step 3, collecting the detected data and screening the collected data;
and 4, establishing a strength measuring curve applicable to the structural concrete combination resilience method with the strength range of 20.0-100.0 MPa according to the screened data.
Further, the impact energy of the high-strength rebound apparatus in the step 1 is 4.5J, and the impact energy of the medium-sized rebound apparatus is 2.207J.
Further, the matrix in step 1 is a 4 × 4 matrix.
Furthermore, the number of the medium-sized rebound tester measuring points and the number of the high-strength rebound tester measuring points in the step 1 are both 8.
Furthermore, the medium-size rebound tester measuring points and the high-strength rebound tester measuring points in the step 1 are arranged at intervals.
Further, the matrix in the step 1 is a 4 × 4 matrix, and the width and the length of the matrix are both 200 mm.
Further, the collected data are screened in the step 3, and the maximum value and the minimum value of the rebound value measured by the medium-sized resiliometer and the rebound value measured by the high-strength resiliometer are respectively abandoned.
Further, the step 4 of establishing a strength measurement curve applicable to the structural concrete combination springback method with the strength range of 20.0 MPa-100.0 MPa according to the screened data comprises the following steps:
step 4.1, respectively calculating the average value of the rebound values measured by the medium-sized resiliometer and the average value of the rebound values measured by the high-strength resiliometer;
and 4.2, establishing a structural concrete combined springback method strength measurement curve applicable to the strength range of 20.0-100.0 MPa according to the average value of the springback values measured by the medium-sized resiliometers and the average value of the springback values measured by the high-strength resiliometers.
And 4.3, performing regression fitting by adopting a least square principle to obtain a combined springback method detected concrete compressive strength measuring curve, wherein the calculation formula of the combined springback method measured concrete strength curve suitable for the structural concrete with the strength range of 20.0-100.0 MPa is as follows:
in the calculation formula:
for conversion of concrete strength to value, RmThe average value, r, of the rebound values measured by the high-strength resiliometermA, B, C are all constants which are the average of the rebound values measured by the medium resiliometer.
The present application is not limited to the above-described embodiments, and any variations, modifications, and substitutions that may occur to those skilled in the art are intended to fall within the scope of the present application without departing from the spirit of the invention.
Claims (8)
1. A method for detecting the compressive strength of concrete by combined springback, which comprises the following steps:
step 1, establishing a matrix of a medium-sized resiliometer measuring point and a high-strength resiliometer measuring point on a concrete member to be measured by using a high-strength resiliometer and a medium-sized resiliometer;
step 2, carrying out data detection on the medium-sized resiliometer measuring points and the high-strength resiliometer measuring points of the matrix of the medium-sized resiliometer measuring points and the high-strength resiliometer measuring points;
step 3, collecting the detected data and screening the collected data;
and 4, establishing a strength measuring curve applicable to the structural concrete combination resilience method with the strength range of 20.0-100.0 MPa according to the screened data.
2. The method for detecting the compressive strength of the concrete through combined springback according to claim 1, wherein the impact energy of the high-strength rebound tester in the step 1 is 4.5J, and the impact energy of the medium-size rebound tester is 2.207J.
3. The method for detecting the compressive strength of the concrete through the combination of the springback according to claim 1, wherein the matrix in the step 1 is a 4 x 4 matrix.
4. The method for detecting the compressive strength of the concrete through the combined resilience of claim 3, wherein the number of the medium-sized resiliometer measuring points and the number of the high-strength resiliometer measuring points in the step 1 are both 8.
5. The method for detecting the compressive strength of the concrete through the combined resilience as claimed in claim 4, wherein the medium-sized resiliometer measuring points and the high-strength resiliometer measuring points in the step 1 are arranged at intervals.
6. The method for detecting the compressive strength of the concrete through the combined springback of claim 3, wherein the matrix in the step 1 is a 4 x 4 matrix, and the width and the length of the matrix are both 200 mm.
7. The method for detecting the compressive strength of the concrete through the combined springback as claimed in claim 1, wherein the collected data are screened in step 3, and the maximum value and the minimum value of the springback value measured by the medium-sized resiliometer and the springback value measured by the high-strength resiliometer are respectively discarded.
8. The method for detecting the compressive strength of the concrete through the combined springback according to claim 1, wherein the step 4 of establishing a structural concrete combined springback method strength measurement curve applicable to the strength range of 20.0MPa to 100.0MPa according to the screened data comprises the following steps:
step 4.1, respectively calculating the average value of the rebound values measured by the medium-sized resiliometer and the average value of the rebound values measured by the high-strength resiliometer;
and 4.2, establishing a structural concrete combined springback method strength measurement curve applicable to the strength range of 20.0-100.0 MPa according to the average value of the springback values measured by the medium-sized resiliometers and the average value of the springback values measured by the high-strength resiliometers.
And 4.3, performing regression fitting by adopting a least square principle to obtain a combined springback method detected concrete compressive strength measuring curve, wherein the calculation formula of the combined springback method measured concrete strength curve suitable for the structural concrete with the strength range of 20.0-100.0 MPa is as follows:
in the calculation formula:
for conversion of concrete strength to value, RmThe average value, r, of the rebound values measured by the high-strength resiliometermA, B, C are all constants which are the average of the rebound values measured by the medium resiliometer.
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Cited By (2)
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| 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 |
| CN114235578A (en) * | 2021-12-17 | 2022-03-25 | 哈尔滨工业大学 | Ice body resilience value test fixing frame and ice body compressive strength test method |
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| CN114235578A (en) * | 2021-12-17 | 2022-03-25 | 哈尔滨工业大学 | Ice body resilience value test fixing frame and ice body compressive strength test method |
| CN114235578B (en) * | 2021-12-17 | 2023-12-05 | 哈尔滨工业大学 | Ice rebound value test fixing frame and ice compressive strength test method |
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