CN101545840A - Method for calculating strength of structural concrete by strength of core - Google Patents
Method for calculating strength of structural concrete by strength of core Download PDFInfo
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- CN101545840A CN101545840A CN200910031466A CN200910031466A CN101545840A CN 101545840 A CN101545840 A CN 101545840A CN 200910031466 A CN200910031466 A CN 200910031466A CN 200910031466 A CN200910031466 A CN 200910031466A CN 101545840 A CN101545840 A CN 101545840A
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Abstract
The invention discloses a method for calculating strength of structural concrete by strength of a core, belonging to the concrete strength testing of constructional engineering. The method has the key technical scheme that a core with the diameter of 75 mm is drilled on a structural concrete solid, the core is cut and rubbed down, a universal material tester is used for performing compression test to obtain the concrete compressive strength value of the core, and the structural concrete strength is calculated by a modified coefficient formula. The invention has the advantages of small error and high precision, and can be applied to quality control in construction projects, evaluation and judicial expertise of existed buildings and buildings after disasters.
Description
Technical field
The invention belongs to the construction work concrete strength and detect, be specifically related to a kind of method with core strength of structural concrete intensity.
Background technology
Concrete strength is the basic foundation of evaluation construction engineering quality.Under normal circumstances, xoncrete structure should be by the requirement of " reinforced concrete construction and acceptance specification ", make cube standard curing test block and carry out the evaluation and the examination of concrete strength, but when running into some special circumstances (to the test result of test block compressive strength when with suspicion, because of material, construction or maintenance are bad and when the concrete quality problem takes place, concrete suffers freeze injury, fire, in the time of need detecting in the building structure used for many years or the buildings concrete strength during chemical erosion or other infringement), will directly carry out quality testing and evaluation to member itself, wherein a kind of half lossless detection method---core drilling method (drill through concrete core sample and detect its intensity) is generally believed it is a kind of directly perceived, method reliable and that accurately the intensity of concrete component is evaluated.
The method with core strength of structural concrete intensity of " core drilling method detect concrete strength technical regulation " regulation, its main points are to think that nominal diameter is that the compression strength value of 70～75mm core test specimen is suitable with concrete cube test specimen compression strength value.But a large amount of detections practice shows, when detecting concrete strength with core drilling method, the compression strength value of core test specimen and value of concrete strength are along with the variation of starting material, maintenance process, the length of time, label, dry and wet state, all might change, that is to say, detect concrete strength with core drilling method and have region.China is vast in territory, the various places starting material property of there are differences, and the concrete kind is more, uses national rule to lack specific aim, and the error that causes is big.National rule requires each department to carry out corresponding experimental study, draws the relation that is fit to this area material behavior, and Jiangsu Province's Xuzhou Area does not also have relevant detection technical regulation to utilize.
Summary of the invention
The present invention is directed to core drilling method detection concrete strength and have region, use national rule to lack specific aim, the problem that the error that causes is big provides a kind of method with core strength of structural concrete intensity; This method is specially adapted to Jiangsu Province's Xuzhou Area and measures structural concrete strength.
Concrete technical scheme of the present invention is as follows: a kind of method with core strength of structural concrete intensity mainly comprises following step:
1) on the structural concrete entity, drills through earlier diameter 75mm core;
2) core is cut, polishes;
3) carry out compressive strength test with universal testing machine, draw the concrete crushing strength value of core test specimen;
4) utilize correction factors formula to infer out structural concrete strength according to the concrete crushing strength value of core test specimen.The correction formula of structural concrete intensity is:
f
cu，e＝1.06f
cu，cor
f
Cu, cor---the concrete crushing strength value (MPa) of core test specimen
f
Cu, e---structural concrete compressive strength presumed value (MPa).
Advantage of the present invention: 1., compare, significantly reduce because of detecting repairing, the reinforcing expense that damage structure or member cause with big core core drilling method because the 75mm core diameter is less.2. the 75mm core utilizes pre-determined correction factors formula to be converted into the concrete standard compression strength value, unite with concrete works design strength and delivery receiving acceptance intensity, promptly all be corresponding 150 * 150 * 150 cube standard compressive strength, thereby have good comparability, be convenient to the quality inspection utilization.3. use that establish concrete strength error of the present invention is little, precision is high, can estimate concrete engineering quality objectively, stop hidden dangers in project.
Embodiment
Further specify method of the present invention and effect below in conjunction with embodiment.
Embodiment
Adopt this method on engineering structure every batch drill through Φ 75mm * 75mm core test specimen and carry out compression test for 3 groups.In different building sites, selected four strength grades altogether, eight structure positions drill through ratio of height to diameter and are 24 groups of the Φ 75mm cores of 1:1.Test result sees Table 1.
Table 1 engineering structure concrete is got the core intensity table of comparisons
Claims (4)
1, a kind of method with core strength of structural concrete intensity, it is characterized in that: it may further comprise the steps: the core that drills through earlier diameter 75mm on the structural concrete entity, by cutting, polishing, carry out compressive strength test with universal testing machine then, draw the concrete crushing strength value f of core test specimen
Cu, cor, utilize correction factors formula to infer out structural concrete strength again; Concrete steps are:
1) elder generation's core boring sampling on structural concrete;
2) core is cut, polishes;
3) carry out compressive strength test with universal testing machine, draw the concrete crushing strength value of core test specimen;
4) utilize correction factors formula to infer out structural concrete strength according to the concrete crushing strength value of core test specimen;
Structural concrete intensity calculates as follows:
f
cu，e＝1.06f
cu，cor
f
Cu, cor---the concrete crushing strength value (MPa) of core test specimen
f
Cu, e---structural concrete compressive strength presumed value (MPa).
2, the method with core strength of structural concrete intensity according to claim 1, it is characterized in that: core boring sampling adopts adamas or the man-made diamond thin drilling bit of internal diameter 75mm, and bit matrix must not have macroscopic crack, scarce limit, Shao Jiao, inclination and hydraucone distortion.
3, the method with core strength of structural concrete intensity according to claim 1, it is characterized in that: core is cut, polishes, and the core ratio of height to diameter that is processed into is 1:1.
4, the method with core strength of structural concrete intensity according to claim 1, it is characterized in that: the coarse aggregate of structural concrete is 5～20mm, intensity is at 15～60Mpa, natural curing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910031466A CN101545840A (en) | 2009-04-29 | 2009-04-29 | Method for calculating strength of structural concrete by strength of core |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910031466A CN101545840A (en) | 2009-04-29 | 2009-04-29 | Method for calculating strength of structural concrete by strength of core |
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| Publication Number | Publication Date |
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| CN101545840A true CN101545840A (en) | 2009-09-30 |
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| CN200910031466A Pending CN101545840A (en) | 2009-04-29 | 2009-04-29 | Method for calculating strength of structural concrete by strength of core |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279132A (en) * | 2011-08-03 | 2011-12-14 | 安徽省（水利部淮河水利委员会）水利科学研究院 | Method for detecting flexural strength of concrete structure |
| CN102980819A (en) * | 2012-10-30 | 2013-03-20 | 上海交通大学 | Method for detecting strength of soil-cement admixture by using hardness test |
| CN103267680A (en) * | 2013-05-10 | 2013-08-28 | 长安大学 | Intergraded method for designing and constructing semi-rigid base material |
| CN103674705A (en) * | 2013-12-17 | 2014-03-26 | 深圳大学 | Method for fast predicting compressive strength of cement in 24 hours |
| CN104132842A (en) * | 2014-06-30 | 2014-11-05 | 安徽省建筑科学研究设计院 | Square pile body concrete total cross section intensity examination method |
| CN104198283A (en) * | 2014-09-02 | 2014-12-10 | 建研科技股份有限公司 | Pulling-out instrument control method for automatically detecting concrete strength |
| CN104964874A (en) * | 2015-05-26 | 2015-10-07 | 宿州学院 | Pit sand concrete compressive strength detection method and apparatus thereof |
| CN105699116A (en) * | 2016-01-22 | 2016-06-22 | 中国长江三峡集团公司 | Concrete dam coring method |
| CN111077065A (en) * | 2019-12-30 | 2020-04-28 | 广东交科检测有限公司 | Method for measuring damaged depth of concrete after high temperature through grouped compression resistance of core samples |
| CN112033734A (en) * | 2020-09-16 | 2020-12-04 | 贵州工程应用技术学院 | High-precision in-service concrete strength rapid detection equipment |
| CN116399692A (en) * | 2023-01-17 | 2023-07-07 | 四川省建筑科学研究院有限公司 | Mass assessment method for compressive strength of concrete with quality problem |
-
2009
- 2009-04-29 CN CN200910031466A patent/CN101545840A/en active Pending
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102279132A (en) * | 2011-08-03 | 2011-12-14 | 安徽省（水利部淮河水利委员会）水利科学研究院 | Method for detecting flexural strength of concrete structure |
| CN102980819A (en) * | 2012-10-30 | 2013-03-20 | 上海交通大学 | Method for detecting strength of soil-cement admixture by using hardness test |
| CN102980819B (en) * | 2012-10-30 | 2015-12-16 | 上海交通大学 | The method of cement mixing soil intensity is detected with hardness test |
| CN103267680A (en) * | 2013-05-10 | 2013-08-28 | 长安大学 | Intergraded method for designing and constructing semi-rigid base material |
| CN103674705A (en) * | 2013-12-17 | 2014-03-26 | 深圳大学 | Method for fast predicting compressive strength of cement in 24 hours |
| CN104132842B (en) * | 2014-06-30 | 2016-03-30 | 安徽省建筑科学研究设计院 | A kind of square pile pile concrete total cross-section ruggedness test method |
| CN104132842A (en) * | 2014-06-30 | 2014-11-05 | 安徽省建筑科学研究设计院 | Square pile body concrete total cross section intensity examination method |
| CN104198283A (en) * | 2014-09-02 | 2014-12-10 | 建研科技股份有限公司 | Pulling-out instrument control method for automatically detecting concrete strength |
| CN104964874A (en) * | 2015-05-26 | 2015-10-07 | 宿州学院 | Pit sand concrete compressive strength detection method and apparatus thereof |
| CN105699116A (en) * | 2016-01-22 | 2016-06-22 | 中国长江三峡集团公司 | Concrete dam coring method |
| CN105699116B (en) * | 2016-01-22 | 2018-03-27 | 中国长江三峡集团公司 | A kind of concrete dam coring method |
| CN111077065A (en) * | 2019-12-30 | 2020-04-28 | 广东交科检测有限公司 | Method for measuring damaged depth of concrete after high temperature through grouped compression resistance of core samples |
| CN112033734A (en) * | 2020-09-16 | 2020-12-04 | 贵州工程应用技术学院 | High-precision in-service concrete strength rapid detection equipment |
| CN112033734B (en) * | 2020-09-16 | 2023-08-18 | 贵州工程应用技术学院 | High-precision in-service concrete strength rapid detection equipment |
| CN116399692A (en) * | 2023-01-17 | 2023-07-07 | 四川省建筑科学研究院有限公司 | Mass assessment method for compressive strength of concrete with quality problem |
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Open date: 20090930 |