CN102721617A - Method for detecting concrete compression strength by using single shear method - Google Patents
Method for detecting concrete compression strength by using single shear method Download PDFInfo
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- CN102721617A CN102721617A CN2012102378985A CN201210237898A CN102721617A CN 102721617 A CN102721617 A CN 102721617A CN 2012102378985 A CN2012102378985 A CN 2012102378985A CN 201210237898 A CN201210237898 A CN 201210237898A CN 102721617 A CN102721617 A CN 102721617A
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Abstract
The invention relates to a method for detecting the concrete compression strength by using a single shear method. The method comprises the following steps: step 1, selecting N-numbered positions on the concrete to be detected as the shear sample part for drilling a core of concrete, drilling a cylindrical core of concrete on the selected shear sample part, shearing all the cores of concrete by using a concrete shearing device, recording the peak values of shear force of the cores of concrete at the shearing moment, calculating the concrete shear strength of all the cores of concrete based on the formula: concrete shear strength=F/S, substituting the obtained concrete shear strength into the formula for detecting the concrete strength, and calculating the concrete conversion strength of all the cores of concrete; and step 2, adding the N-numbered concrete conversion strengths obtained in the above step, dividing the added value by N to obtain an average value. The method is substantially different from the conventional concrete strength detection method, has favorable popularization and application values, and can better improve the concrete strength detection technique.
Description
Technical field
The present invention relates to the detection method in concrete strength detection technique field, particularly a kind of concrete crushing strength.
Background technology
Concrete strength detection technique commonly used at present and method have Non-Destructive Testing to detect two kinds with damaged.Said Non-Destructive Testing is divided into rebound method, overall approach, ultrasonic method etc., and it is to utilize concrete surface hardness, carbonation depth and parameters,acoustic conversion concrete strength, and Non-Destructive Testing is easy to operate, but the testing result error is bigger.Said damaged the detection is divided into core drilling method, back dress pulling out method, penetration method etc. again; It is the test specimen mechanics parameter conversion concrete strength that utilizes regulation; Damaged testing result precision is higher, but concrete is damaged big, and has shortcomings such as operation is many, operation inconvenience; Like core drilling method commonly used, its core test specimen drills through, cutting and the both ends of the surface depth of parallelism, end face and axis verticality processing and test specimen production process, operating process etc. are all comparatively loaded down with trivial details.
Summary of the invention
The purpose of this invention is to provide a kind of promptly can the Non-Destructive Testing concrete, have a method that the high original position simple shear method of testing result precision detects concrete crushing strength again.
For realizing above-mentioned purpose; The present invention adopts following technical scheme: a kind of original position simple shear method detects the method for concrete crushing strength; It is characterized in that step is following: step 1, on detected concrete, select N position,, all concrete core samples are sheared with the concrete shearing device at the concrete core sample of the shearing sample site place brill rounding cylindricality of choosing as the shearing sample site of boring the system concrete core sample; Write down all concrete core samples and cut off the shearing force peak value of moment; Through formula concrete shearing intensity (MPa)=F/S, calculate the concrete shearing intensity of all concrete core samples, wherein F is the shearing force peak value; S is the area of section of concrete core sample; With the concrete shearing intensity substitution concrete strength-measuring formula that obtains, calculate the concrete crushing strength of all concrete core samples according to the concrete strength-measuring formula, this concrete crushing strength is called concrete conversion intensity again; Step 2, the N that obtains in the above-mentioned steps concrete conversion intensity is added up, again divided by N, obtain a mean value, this mean value is the concrete presumption of strength of detected concrete, the i.e. typical value of concrete strength.
In the said step 1, can be on detected concrete, to select a position earlier, bore the concrete core sample of rounding cylindricality at the shearing sample site place that chooses as the shearing sample site of boring the system concrete core sample; With the concrete shearing device this concrete core sample is sheared; Write down this concrete core sample and cut off the shearing force peak value of moment,, calculate the concrete shearing intensity of this concrete core sample through formula concrete shearing intensity (MPa)=F/S; Wherein F is the shearing force peak value; S is the area of section of concrete core sample, with the concrete shearing intensity substitution concrete strength-measuring formula that obtains, calculates the concrete crushing strength of this concrete core sample according to the concrete strength-measuring formula; Be the concrete conversion intensity of this concrete core sample; And then repeat said process N-1 time, and obtain N-1 concrete conversion intensity, finally obtain N concrete conversion intensity.
In the said step 1; Can also be on detected concrete, to select N position earlier, bore the concrete core sample of rounding cylindricality at the shearing sample site place that chooses, and then all concrete core samples are sheared with the concrete shearing device as the shearing sample site of boring the system concrete core sample; Write down all concrete core samples and cut off the shearing force peak value of moment; Through formula concrete shearing intensity (MPa)=F/S, calculate the concrete shearing intensity of all concrete core samples, wherein F is the shearing force peak value; S is the area of section of concrete core sample; With the concrete shearing intensity substitution concrete strength-measuring formula that obtains, calculate the concrete crushing strength of all concrete core samples according to the concrete strength-measuring formula, finally obtain N concrete conversion intensity.
The formula for measuring strength of concrete can be:? ?
, where
denotes
a concrete core samples of the concrete translation of strength;
? denotes
a concrete core samples of the concrete shear strength.
Said shearing sample site can arrange evenly on detected concrete that the distance between the adjacent two shearing sample site can be not less than 30mm, and the shearing sample site can be not less than 25mm apart from the end limit of detected concrete.
The diameter of said concrete core sample can be 38mm～49mm, and length can be 25mm～30mm.
Said concrete core sample is the concrete core sample that links together with detected concrete, or the concrete core sample that separates from detected concrete.
Compared with prior art the present invention has following characteristics and beneficial effect: the present invention is a kind of method that detects normal concrete compressive strength; Be concrete core sample radially to be applied the shearing force perpendicular to pressure-bearing surface with special-purpose concrete shearing device; Make and cut core shear failure radially perpendicular to axial direction, and come the detection method of establish concrete strength according to shear stress.
The present invention can detect concrete compressive strength, has substantial differently with present existing other concrete strength detecting methods, has the excellent popularization using value, can better improve and enrich the concrete strength detection technique.
The present invention is very little to the damage of detected concrete, and the drilling depth on the detected concrete is merely a millimeter rank (25mm～30mm), so be fit to detect the intensive concrete of reinforcing bar configuration, belong to concrete Non-Destructive Testing new technique.
What the present invention is directed to is the detection of the internal intensity of detected concrete, and its measuring accuracy is higher than classic method, easy to detect quick.
It is wide that the present invention detects length of time scope, and all shear test blocks that can bore the type of processing all are suitable for, and the suitable age of concrete can be to 14 days, can be the stretch-draw of PSC and put and the construction in concrete length of time morning provides technical data.
The present invention is applicable to the detection of the Structural Engineering concrete strength of C10-C80, has the advantage that operation is few, simple to operation, accurate fast, cost is low, applicability is strong.
The present invention does not receive the restriction of the surface configuration (such as convex surface, concave surface, curved surface, pitted skin etc.) of detected concrete, does not receive the restriction of detected concrete size cross-sectional sizes yet, limited by pore-forming technique.That is to say that the present invention is to the not special restriction of the shape of detected concrete, the test position is also unrestricted, and detected concrete does not need any processed (surface of on-the-spot test position need not to handle, and the concrete core sample that is drilled to need not handled yet).
The key distinction of the present invention and other detection methods is as shown in the table:
Description of drawings
Below in conjunction with accompanying drawing the present invention is done further detailed explanation.
Fig. 1 is the synoptic diagram that first kind of concrete shearing device sheared the concrete core sample that links together with detected concrete.
Fig. 2 is the synoptic diagram that first kind of concrete shearing device sheared the concrete core sample that separates from detected concrete.
Fig. 3 is first kind of synoptic diagram that the concrete shearing device is cut off concrete core sample.
Fig. 4 is second kind of concrete shearing schematic representation of apparatus.
Reference numeral: 1-concrete shearing device, 2-detected concrete, 3-concrete core sample.
Embodiment
Referring to embodiment, the step of the method for this original position simple shear method detection concrete crushing strength is following.
Said step 1 can be on detected concrete 2, to select a position as the shearing sample site of boring the system concrete core sample earlier; Bore the concrete core sample of rounding cylindricality at the shearing sample site place that chooses; With concrete shearing device 1 this concrete core sample 3 is sheared; Cut off the shearing force peak value of moment with this concrete core sample 3 of data acquisition system (DAS) record; Through formula concrete shearing intensity (MPa)=F/S, calculate the concrete shearing intensity of this concrete core sample 3, with the concrete shearing intensity substitution concrete strength-measuring formula that obtains; Calculate the concrete crushing strength of this concrete core sample 3, i.e. the concrete conversion intensity of this concrete core sample 3 according to the concrete strength-measuring formula; Repeat said process N-1 time then, obtain N-1 concrete conversion intensity again, finally just obtained N concrete conversion intensity.
Said step 1 can also be on detected concrete 2, to select N position as the shearing sample site of boring the system concrete core sample earlier, bores the concrete core sample of rounding cylindricality at the shearing sample site place that chooses; And then shear with 1 pair of all concrete core sample 3 of concrete shearing device; Cut off the shearing force peak value of moment with all concrete core samples 3 of data acquisition system (DAS) record; Through formula concrete shearing intensity (MPa)=F/S; Calculate the concrete shearing intensity of all concrete core samples 3; With the concrete shearing intensity substitution concrete strength-measuring formula that obtains, calculate the concrete crushing strength of all concrete core samples 3 according to the concrete strength-measuring formula, finally just obtained N concrete conversion intensity.
Said N can be three, five, seven or more, can select according to actual conditions.
In this embodiment, the concrete measuring strength formula is:
, where
denotes
a concrete core samples of the concrete translation of strength (MPa);
? denotes
a concrete core samples of the concrete shear strength (MPa).In other embodiments; Can also adopt other concrete strength-measuring formula (can be linear function equation, power function equation, exponential function equation etc.; Through regretional analysis, comprehensively confirm according to related coefficient, standard deviation) calculate the concrete conversion intensity of concrete core sample 3.
In the said step 1, N the position of selecting on the detected concrete 2 can be any position, and adjacent two shear sample site can be arranged on the not ipsilateral of detected concrete.Preferred mode is that the shearing sample site of electing is evenly arranged on detected concrete 2, and the distance between the adjacent two shearing sample site is not less than 30mm, and the shearing sample site is not less than 25mm apart from the end limit of detected concrete 2.
The diameter of said concrete core sample 3 is 38mm～49mm, and length is 25mm～30mm.Referring to Fig. 1, said concrete core sample 3 both can be the concrete core sample that links together with detected concrete 2, referring to Fig. 2, also can be the concrete core sample that separates from detected concrete 2.
The corresponding relation that the present invention sets up according to the radial shear intensity level of concrete axial compression strength and concrete core sample; On the entity of detected concrete, be drilled to concrete core sample; Adopt the concrete shearing device that concrete core sample is carried out shear test, infer concrete crushing strength through shear test shear resistance that draws and the strong formula of setting up in advance of survey.Use when of the present invention, the suffered simple stress of concrete core sample is merely shearing force, and the destruction face of concrete core sample is consistent with the shearing force direction.
The present invention requires the inside and outside layer of detected concrete evenly, not have defective just to the intensity of detected concrete.Should not be less than 14 days the length of time of detected concrete, and the compressive strength of detected concrete should be in 10MPa～80MPa scope, and the thickness of detected concrete should be less than 80mm.The concrete of shearing the sample site place is answered open defects such as free from flaw, loose, hole, honeycomb.Shear sample site and can be arranged in plane, curved surface, convex surface, concave surface, pitted skin (sprayed concrete).
Said concrete shearing device can have multiple, such as first kind of concrete shearing device shown in Fig. 1, Fig. 2, or second kind of concrete shearing device shown in Fig. 4.
According to Fig. 1 or shown in Figure 2; Concrete shearing device 1 is installed; Left jamming claw on the concrete shearing device 1, right jamming claw are inserted in concrete core sample (setting of left jamming claw, right jamming claw and concrete core sample vertical direction stagger each other) and apply pretightning force; Concrete shearing device 1 utilizes concrete core sample to position, and concrete core sample provides counter-force (resistance) to the concrete shearing device.
Claims (7)
1. an original position simple shear method detects the method for concrete crushing strength, it is characterized in that step is following:
Step 1, shearing sample site in N position of the last selection of detected concrete (2) as brill system concrete core sample; Bore the concrete core sample (3) of rounding cylindricality at the shearing sample site place that chooses; With concrete shearing device (1) all concrete core samples (3) are sheared, write down the shearing force peak value that all concrete core samples (3) are cut off moment, through formula concrete shearing intensity=F/S; Calculate the concrete shearing intensity of all concrete core samples (3); Wherein F is the shearing force peak value, and S is the area of section of concrete core sample (3), with the concrete shearing intensity substitution concrete strength-measuring formula that obtains; Calculate the concrete crushing strength of all concrete core samples (3) according to the concrete strength-measuring formula, this concrete crushing strength is called concrete conversion intensity again;
Step 2, the N that obtains in the above-mentioned steps concrete conversion intensity is added up, again divided by N, obtain a mean value, this mean value is the concrete presumption of strength of detected concrete (2), the i.e. typical value of concrete strength.
2. original position simple shear method according to claim 1 detects the method for concrete crushing strength; It is characterized in that: in the said step 1, go up in detected concrete (2) earlier and select a position, bore the concrete core sample of rounding cylindricality at the shearing sample site place that chooses as the shearing sample site of boring the system concrete core sample; With concrete shearing device (1) this concrete core sample (3) is sheared; Write down this concrete core sample (3) and cut off the shearing force peak value of moment,, calculate the concrete shearing intensity of this concrete core sample (3) through formula concrete shearing intensity=F/S; Wherein F is the shearing force peak value; S is the area of section of concrete core sample (3), with the concrete shearing intensity substitution concrete strength-measuring formula that obtains, calculates the concrete crushing strength of this concrete core sample (3) according to the concrete strength-measuring formula; Be the concrete conversion intensity of this concrete core sample (3); And then repeat said process N-1 time, and obtain N-1 concrete conversion intensity, finally obtain N concrete conversion intensity.
3. original position simple shear method according to claim 1 detects the method for concrete crushing strength; It is characterized in that: in the said step 1; Go up in detected concrete (2) earlier and select N position, bore the concrete core sample of rounding cylindricality at the shearing sample site place that chooses, and then all concrete core samples (3) are sheared with concrete shearing device (1) as the shearing sample site of boring the system concrete core sample; Write down all concrete core samples (3) and cut off the shearing force peak value of moment; Through formula concrete shearing intensity=F/S, calculate the concrete shearing intensity of all concrete core samples (3), wherein F is the shearing force peak value; S is the area of section of concrete core sample (3); With the concrete shearing intensity substitution concrete strength-measuring formula that obtains, calculate the concrete crushing strength of all concrete core samples (3) according to the concrete strength-measuring formula, finally obtain N concrete conversion intensity.
4 according to claim 1, wherein the in-situ concrete compressive strength single shear assay method, wherein: said measuring strength concrete formula: ?
, where
denotes
a concrete core samples of the concrete translation of strength;
denotes
a concrete core samples of the concrete shear strength.
5. original position simple shear method according to claim 1 detects the method for concrete crushing strength; It is characterized in that: said shearing sample site goes up evenly in detected concrete (2) and arranges; Distance between the adjacent two shearing sample site is not less than 30mm, and the shearing sample site is not less than 25mm apart from the end limit of detected concrete (2).
6. original position simple shear method according to claim 1 detects the method for concrete crushing strength, and it is characterized in that: the diameter of said concrete core sample (3) is 38mm～49mm, and length is 25mm～30mm.
7. original position simple shear method according to claim 1 detects the method for concrete crushing strength; It is characterized in that: said concrete core sample (3) is the concrete core sample that links together with detected concrete (2), or the concrete core sample that separates from detected concrete (2).
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| CN2012102378985A CN102721617A (en) | 2012-07-11 | 2012-07-11 | Method for detecting concrete compression strength by using single shear method |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1285508A (en) * | 1999-08-23 | 2001-02-28 | 北京市城市建设工程研究院 | In-situ testing contrete compression strength by micro core sample method |
| CN102426143A (en) * | 2011-09-22 | 2012-04-25 | 中国建筑科学研究院 | Method and device for detecting compressive strength of concrete by shearing resistance method |
| CN102435499A (en) * | 2011-09-22 | 2012-05-02 | 王文明 | Method and device for detecting compressive strength of concrete by bending method |
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- 2012-07-11 CN CN2012102378985A patent/CN102721617A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1285508A (en) * | 1999-08-23 | 2001-02-28 | 北京市城市建设工程研究院 | In-situ testing contrete compression strength by micro core sample method |
| CN102426143A (en) * | 2011-09-22 | 2012-04-25 | 中国建筑科学研究院 | Method and device for detecting compressive strength of concrete by shearing resistance method |
| CN102435499A (en) * | 2011-09-22 | 2012-05-02 | 王文明 | Method and device for detecting compressive strength of concrete by bending method |
Non-Patent Citations (1)
| Title |
|---|
| 中华人民共和国建设部: "砌体工程现场检测技术标准GB/T50315-2000", 《中华人民共和国国家标准》 * |
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Application publication date: 20121010 |