CN102539262B - High strength concrete resiliometer and use method thereof - Google Patents
High strength concrete resiliometer and use method thereof Download PDFInfo
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- CN102539262B CN102539262B CN201110436244.0A CN201110436244A CN102539262B CN 102539262 B CN102539262 B CN 102539262B CN 201110436244 A CN201110436244 A CN 201110436244A CN 102539262 B CN102539262 B CN 102539262B
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Abstract
The invention provides an application method of high strength concrete resiliometer. Striking rods [4] of the high strength concrete resiliometer are inserted into a central guide rod [2] from the front end. The striking rods are same in length and diameter but the radiuses of curvature of striking end surfaces are different. The method comprises the following steps: at first, pre-judging the strength range of measured concrete; then selecting the striking rods with radiuses of curvature of striking end surfaces corresponding to the range and installing the striking rods on the resiliometer; then measuring the rebound value according to measurement rules; and finally calculating the strength of concrete or surface hardness estimate value through a rebound curve corresponding to the striking rods and characteristics of the measured concrete. Compared with the prior art, in the invention, a medium resiliometer device is provided with a group of striking rods with various radiuses of curvature of striking end surfaces and special strength measuring curves of corresponding striking rod of specifications are created to easily measure the surface hardness and compression strength of high strength concrete by the medium resiliometer and obtain the measurement result smaller than the allowable error.
Description
Technical field
What the present invention relates to is a kind of using method of high strength concrete resiliometer, belongs in physics and clashes into object extent of rebound test solid material compressive strength or skin hardness technical field with measuring.
Background technology
High-strength concrete (high strength concrete) has different definition in different documents, as < < design of common concrete proportioning rules > > (JGJ 55-2000) refer to the concrete of compressive strength more than 60MPa, < < flyash concrete application technology standard > > (GBJ 146-1990) refers to the concrete of compressive strength more than 40MPa, < < highway bridge and culvert construction technique normalizing > > (JTJ 041-2000) refers to that compressive strength is at the concrete of 50 ~ 80MPa.The present invention refers to the concrete of compressive strength more than 60MPa.
Reisilometer consists of housing, centre pilot, elastic hammer, elastic tension spring, elastic stem, firing lock, pointer and guide rod thereof and reading device.Reisilometer stretching elastic tension spring drives elastic hammer to obtain impact kinetic energy via the surface of elastic stem shock solid material, the bounce that the solid material surface being impacted produces makes elastic hammer produce resilience campaign, using the percentage value of ratio of the rebound stroke of elastic hammer and the ratio of attack stroke or elastic hammer rebound velocity and stroke speed as rebound value, that is:
In formula: the rebound stroke that r is elastic hammer, the impact stroke that L is elastic hammer.Or:
In formula: v
rfor the rebound velocity of elastic hammer, v
0stroke speed for elastic hammer.
Reisilometer detects the skin hardness of solid material by obtaining rebound value.Because the skin hardness of material is corresponding correlativity with its compressive strength conventionally, so reisilometer is also usually used in detecting the compressive strength of solid material.It is the compressive strength for detection of solid concrete that current reisilometer is applied the most widely.
Rebound value is relevant to skin hardness characteristic and the impact strength of tested solid material.The impact strength of reisilometer depends on the shock kinetic energy of reisilometer and effective impact area that elastic stem clashes into end face, clashing into the length that kinetic energy is stretched with it by the rigidity of the elastic tension spring of reisilometer determines, effectively impact area is relevant to the radius-of-curvature of clashing into end face by the diameter of reisilometer elastic stem, and shock end face is spheric.For the reisilometer of same model, its diameter that clashes into kinetic energy, elastic stem is identical with the radius-of-curvature of clashing into end face.Also, for tested solid material, the impact strength of same model reisilometer is identical, and for having the material of similar face hardness, the measured rebound value of same model reisilometer is identical.
For the reisilometer of same model, the test figure that the skin hardness of rebound value and certain measured material or the conversion relation of compressive strength can be by advance by statistics method obtains, and this relation is called rebound curve.The skin hardness or the compressive strength that is to say reisilometer mensuration material check in accordingly result from rebound curve again by first recording rebound value.Rebound curve is relevant with reisilometer characteristic with measured material character, before measuring concrete surface hardness or compressive strength, will set up rebound curve for the reisilometer of every kind of specification and the material of every specific character.The preparation method of rebound curve is determined by the technical regulation in relevant art field conventionally, has stipulated rebound method measure the formulating method of the rebound Strength Curves of concrete crushing strength as appendix in the industry standard < < concrete intensity with rebound method technical regulation > > of the People's Republic of China (PRC) (JGJ/T23-2011) " the special-purpose formulating method of surveying strong curve ".
Conventionally skin hardness or the relation between compressive strength and rebound value (being rebound curve) of material are forward power function or exponential function relation, and the strong curve equation of survey of the pump concrete providing as < < concrete intensity with rebound method technical regulation > > (JGJ/T23-2011) is:
In formula: R is rebound value, f is the compressive strength of the tested pump concrete of inferring; D is the carbonation depth on detected concrete surface, is for revising one of presumed value of concrete crushing strength independently parameter.
Also: rebound value is larger, its corresponding compressive strength of rebound value variable quantity or skin hardness variable quantity are more responsive.Therefore, when rebound value surpasses certain limit, make the calculate compressive strength of the testee obtaining or the error of skin hardness reach the critical point of permissible error, this intensity or hardness are maximum detected intensity or the hardness of reisilometer.Simultaneously intensity or the hardness of measured material are too small, by rebound value cannot be reached in necessary range ability, have exceeded the minimum detection intensity of reisilometer.That is to say, for a kind of reisilometer of model, might not detect the interval that a certain material is contained its all surfaces hardness or compressive strength, only can detect in other words skin hardness or the compressive strength in its certain limit.The interval of the concrete crushing strength value of the strong curve of survey of the pump concrete providing as < < concrete intensity with rebound method technical regulation > > (JGJ/T23-2011) is: 20MPa～60MPa.
In the past because common building is seldom used compressive strength higher than 60 MPa strong concretes, so determination of resilience concrete crushing strength only uses medium-sized reisilometer just enough, and uses individually other modes such as adopted core boring sampling of high-strength concrete to detect its solid strength.Conventionally the reisilometer that is 2.207J by impact energy is in the industry called common reisilometer or medium-sized reisilometer, and impact energy is less than light-duty reisilometer of being called of 2.207J, is greater than the heavy rebound instrument that is called of 2.207J.The heavy rebound instruments that useful impact energy is 9.8J such as foundation structure of some dams, bridge and Important building carry out Non-Destructive Testing.Along with the raising that construction quality is required and the improvement of material conditions, compressive strength is generally applied in kind building higher than 60 MPa high-strength concretes in recent years, and rebound method is the lossless detection method of the detection solid concrete compressive strength of simple and fast, so detecting High Strength Concrete Under Compressive Cyclic Loading intensity, rebound method has also been subject to attention.But the heavy rebound instrument that impact energy was 9.8J is in the past because its volume is large, Heavy Weight, and the concrete crushing strength that is not suitable for most of buildingss detects.For solving rebound method, detect the above high-strength concrete of 60 MPa, produced the reisilometer of many detection High Strength Concrete Under Compressive Cyclic Loading intensity, the reisilometer that the impact energy that the reisilometer that the impact energy proposing as Chinese utility model patent ZL00247527.8 is 5.5J, Chinese utility model patent ZL98201939.4 propose is 4.5J.These reisilometers are compared with existing medium-sized reisilometer, are mainly all quality by increasing elastic hammer in reisilometer, improve that impact energy that elastic tension spring rigidity and level of stretch improve reisilometer realizes the detection of high-strength concrete.Compare with existing medium-sized reisilometer, this class reisilometer has increased operator's work load, has weakened that original concrete intensity with rebound method is agile, intrinsic advantage easily.This be because, to the strengthening of elastic hammer, elastic tension spring, elastic hammer in reisilometer and the synchronous reinforcement to other parts that brings thus, not only increased the quality of reisilometer, also made operator need to pay in when operation the elastic force that more muscle power overcomes elastic tension spring and reach necessary tensile elongation.Also improved the stroke speed of elastic hammer when measuring, thereby each movable parts wear increase causes adverse effect to the mission life of reisilometer thereupon simultaneously.
Summary of the invention
For above-mentioned deficiency, technical matters to be solved by this invention is exactly to avoid reaching the technological approaches of raising reisilometer to the accuracy of high-strength concrete skin hardness or compressive strength measurement by increasing impact energy, proposes a kind of using method of high strength concrete resiliometer on the basis that keeps existing medium-sized resiliometer impact energy value.
The using method of high strength concrete resiliometer provided by the invention, high strength concrete resiliometer used has elastic hammer, elastic tension spring, elastic stem, centre pilot, wherein elastic hammer quality is 370g, elastic tension spring rigidity is 785 N/m, elastic tension spring tensile elongation is 75 mm, nominal impact energy is 2.207J, wherein elastic stem from front end sleeve on centre pilot, said elastic stem is equipped with a plurality of, each elastic stem length is identical with diameter and to clash into end face radius-of-curvature different, wherein elastic stem diameter is 15 mm, clashes into end face radius-of-curvature within the scope of 5mm ~ 35mm; During use, concrete strength range is surveyed in first anticipation, selecting to clash into the end face radius-of-curvature elastic stem corresponding with this scope is installed on reisilometer again, by measuring rules, record rebound value again, finally by the rebound curve corresponding with this elastic stem and detected concrete characteristic, converse detected concrete intensity.
The using method of high strength concrete resiliometer provided by the invention, high strength concrete resiliometer used be take existing medium-sized reisilometer as basis, configured a plurality of different elastic stems that clash into the radius-of-curvature of end face, and elastic stem is by the relative reisilometer centre pilot of plug mode removably.Compared with prior art, the present invention does not change any structure of existing medium-sized reisilometer, just according to the different skin hardness of tested solid material or compressive strength, select the different elastic stems that clash into the radius-of-curvature of end face, just can obtain the measurement result that is less than permissible error.The using method of high strength concrete resiliometer provided by the invention, uses and for difference, clashes into rebound curve (also claiming to survey strong curve) that the elastic stem of end face radius-of-curvature obtains and realize with medium-sized reisilometer and change its range interval by changing the shock end face radius-of-curvature of elastic stem.Compared with prior art, the present invention only needs be equipped with the elastic stem of one group of multiple shock end face radius-of-curvature and set up the wherein special use of corresponding each specification elastic stem and survey strong curve and just can easily medium-sized reisilometer conversion be made to the mensuration to the skin hardness of high-strength concrete and compressive strength for medium-sized reisilometer.
Relation principle from the stressed generation elastic deformation of solid material and plastic yield, clashes into same measured object with identical impact energy, and the elastic deformation amount of measured object is negative correlation with the effective impact area being impacted; Also: for uniform impingement kinetic energy (impact kinetic energy of the reisilometer of same model is identical), impact area is less, and springback capacity is less.Therefore, the radius-of-curvature that the elastic stem of decreasing rebound instrument clashes into end face is equivalent to reduce effective impact area, for the resulting rebound value of identical measured object, also can reduce, and vice versa.Experiment is proof also, adopts the medium-sized reisilometer that impact energy is 2.207J to clash into end face radius-of-curvature by reducing elastic stem, and radius-of-curvature is less, and for recording, the corresponding concrete crushing strength of identical rebound value is higher.That is to say, high strength concrete resiliometer provided by the invention can be broken through by changing elastic stem the measurement range of medium-sized reisilometer 10MPa ~ 60MPa.The method of end face radius-of-curvature is clashed in the present invention by reducing elastic stem, make to obtain lower rebound value for the material of similar face hardness or compressive strength, thereby under equal accuracy of detection (permission detects error), improved the sensing range of material surface hardness.For concrete intensity with rebound method, under equal accuracy of detection (allowing to detect error), expanded and improved the sensing range of concrete crushing strength, can the detection as High Strength Concrete Under Compressive Cyclic Loading intensity by medium-sized reisilometer.
The mensuration of said rebound curve is to carry out according to the determined method of the technical regulation of corresponding professional domain.As for detecting concrete crushing strength, by the method for the middle appendix of the industry standard < < concrete intensity with rebound method technical regulation > > of the People's Republic of China (PRC) (JGJ/T23-2011) " the special-purpose formulating method of surveying strong curve ", be respectively the elastic stem of different size radius-of-curvature and the strong curve of the special-purpose survey of the concrete of different qualities formulation.Skin hardness for other materials detects, and can be undertaken by this kind of corresponding set rebound curve method for building up of material.
Wherein the shock end face radius-of-curvature of elastic stem is respectively 5mm, 7.5mm, 10mm, 15mm, 25mm, six specifications of 35mm, respectively corresponding six differences in 10MPa ~ 130MPa for detection of concrete crushing strength but have the interval of common factor.
When wherein the shock end face radius-of-curvature of elastic stem is less than 7.5mm, clashes into end face and be connected with elastic stem cylinder through truncated cone-shaped, with the stress transmission of even elastic stem link position.
The using method of high strength concrete resiliometer provided by the invention, for digital reisilometer, each corresponding rebound curve of concrete that clashes into end face radius-of-curvature elastic stem and different qualities is stored in computer system, and on interface, is provided with selector switch and makes instrument extract corresponding rebound curve data for follow-up computing according to the concrete of selected shock end face radius-of-curvature and different qualities controlling.Be that said rebound curve is stored in computer system, before measuring rebound value, first with the selector switch controlling on interface, be adjusted to selected elastic stem position and the characteristic location of detected concrete, record after rebound value and by instrument, according to selected elastic stem and concrete property, to extract corresponding rebound curve data and carry out computing
Accompanying drawing explanation
Fig. 1 is reisilometer partial sectional view of the present invention and appended elastic stem cut-open view, in figure: 1-housing, 2-centre pilot, 3-elastic tension spring, 4-elastic stem, 41,42,43,44, the other elastic stem of configuration of 45-.
Embodiment
A using method for high strength concrete resiliometer, high strength concrete resiliometer used as shown in Figure 1, is comprised of an existing medium-sized reisilometer and six elastic stems that configure.Elastic stem 4 inserts and is enclosed within centre pilot 2 from housing 1 front end, and elastic tension spring 3 is connected between housing front end and elastic hammer, and elastic hammer is enclosed within on centre pilot and is positioned at the rear end of elastic stem.During work, be pressed into elastic stem, by centre pilot by elastic hammer to pusher the elastic tension spring that stretches, when being stretched to definite tensile elongation, extension spring triggers firing lock, elastic hammer shock elastic stem rear end face impact is delivered to measured material surface by clashing into end face forward under elastic tension spring effect.The be impacted surface of material produces bounce to elastic stem, by elastic stem transfer function to elastic hammer, is made elastic hammer produce resilience campaign and is driven pointer slip to indicate rebound value.Six elastic stem front ends that configure clash into end face radius-of-curvature and are respectively 5mm, 7.5mm, 10mm, 15mm, 25mm, six specifications of 35mm, can be used for compressive strength in the concrete detection of 10MPa ~ 130MPa.The elastic stem 4 that wherein clashes into end face radius-of-curvature and be 25mm is medium-sized reisilometer first wife elastic stems, and all the other five is that the elastic stem 41,42,43,44,45 of configuration is in addition selected by surveyed concrete compressive strength interval.Wherein clashing into end face radius-of-curvature is the elastic stem 41 of 5mm, and it clashes into end face and is connected with elastic stem cylinder through truncated cone-shaped.
The using method of above-mentioned high strength concrete resiliometer, after determining the shock end face radius-of-curvature of the elastic stem configuring, according to appendix in People's Republic of China's industry standard < < concrete intensity with rebound method technical regulation (JGJ/T23-2011) > > " the special-purpose formulating method of surveying strong curve ", draw the concrete special-purpose rebound curve of the corresponding various characteristics of each elastic stem.This rebound curve need only be set up once just can be used as technical information use with product.When measuring, in the design strength grade of precognition detected concrete or by attempting after the measured detected strength grade of concrete of rebound value differentiation of different elastic stems, first according to detected concrete anticipation strength grade, determine range ability, again by the selected elastic stem of this scope, by technical regulation regulation, carry out attack detection again, finally according to gained rebound value, select corresponding rebound curve to extrapolate the compressive strength of detected concrete.As needs, on reisilometer, change elastic stem, before measurement, first the elastic stem being originally contained on reisilometer is extracted from centre pilot, more first fixed elastic stem is put.
For digital reisilometer, the strong curve of the corresponding survey of each elastic stem is write to reisilometer, during use, only need in software, select the strong curve of the survey corresponding with elastic stem.
The present invention has realized the sensing range that makes medium-sized reisilometer have high strength more or hardness.For difference, to the detection of picture, only need provide for simple replacement of different elastic stems, and not need to be equipped with a plurality of reisilometers, and retain medium-sized reisilometer and use light advantage.Make the easily worn part of reisilometer and the calibrating of reisilometer only need to facilitate maintenance by a kind of specification, reduced and purchased and use cost.
Claims (4)
1. the using method of a high strength concrete resiliometer, high strength concrete resiliometer used has elastic hammer, elastic tension spring, elastic stem, centre pilot, wherein elastic hammer quality is 370g, elastic tension spring rigidity is 785 N/m, elastic tension spring tensile elongation is 75 mm, nominal impact energy is 2.207J, wherein elastic stem from front end sleeve on centre pilot, the elastic stem that it is characterized in that high strength concrete resiliometer used is equipped with a plurality of, each elastic stem length is identical with diameter and to clash into end face radius-of-curvature different, wherein elastic stem diameter is 15 mm, clash into end face radius-of-curvature within the scope of 5mm ~ 35mm, during use, concrete strength range is surveyed in first anticipation, selecting to clash into the end face radius-of-curvature elastic stem corresponding with this scope is installed on reisilometer again, by measuring rules, record rebound value again, finally by the rebound curve corresponding with this elastic stem and detected concrete characteristic, converse detected concrete intensity.
2. the using method of high strength concrete resiliometer as claimed in claim 1, it is characterized in that the elastic stem that high strength concrete resiliometer used is equipped with has six specifications, their shock end face radius-of-curvature is respectively 5mm, 7.5mm, 10mm, 15mm, 25mm, 35mm.
3. the using method of high strength concrete resiliometer as claimed in claim 1 or 2, is characterized in that when the shock end face radius-of-curvature of elastic stem is less than 7.5mm, clashes into end face and is connected with elastic stem cylinder through truncated cone-shaped.
4. the using method of high strength concrete resiliometer as claimed in claim 1, it is characterized in that said rebound curve is stored in computer system, before measuring rebound value, first with the selector switch controlling on interface, be adjusted to selected elastic stem position and the characteristic location of detected concrete, record after rebound value and by instrument, according to selected elastic stem and concrete property, to extract corresponding rebound curve data and carry out computing.
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| CN104251882A (en) * | 2014-09-30 | 2014-12-31 | 湖南理工学院 | Establishment method of concrete compression strength curve |
| CN104834771B (en) * | 2015-04-23 | 2018-03-30 | 东南大学 | The method for building up of high content mineral admixtures concrete strength-detecting curve |
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| CN111829910B (en) * | 2020-07-14 | 2021-11-23 | 北京建筑材料科学研究总院有限公司 | Quality evaluation method for filling leveling layer on floating ground |
| CN112213215B (en) * | 2020-09-02 | 2023-04-07 | 廊坊市阳光建设工程质量检测有限公司 | Method for detecting compressive strength of concrete through combined resilience |
| CN112213217A (en) * | 2020-10-22 | 2021-01-12 | 廊坊市阳光建设工程质量检测有限公司 | Method for establishing compression strength curve of concrete detected by rebound method |
| CN114264563A (en) * | 2021-12-27 | 2022-04-01 | 乐陵市回弹仪厂 | 3.503 Joule concrete resiliometer |
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