CN107192624A - A kind of concrete strength detecting method based on impact elasticity ripple - Google Patents

A kind of concrete strength detecting method based on impact elasticity ripple Download PDF

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Publication number
CN107192624A
CN107192624A CN201710174269.5A CN201710174269A CN107192624A CN 107192624 A CN107192624 A CN 107192624A CN 201710174269 A CN201710174269 A CN 201710174269A CN 107192624 A CN107192624 A CN 107192624A
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concrete
ripple
wave
mrow
msub
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赵新华
吕小彬
李萌
孙志恒
陈连芳
吴佳晔
张秀梅
李秀琳
李蓉
张家宏
黄昊
王荣鲁
孙粤琳
赵妍
卢伟
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STATE GRID XINYUAN HYDROPOWER CO Ltd
Xinanjiang River Hydraulic Power Plant Of Guo Wangxinyuan Water Power Co Ltd
State Grid Corp of China SGCC
China Institute of Water Resources and Hydropower Research
Beijing IWHR KHL Co Ltd
Original Assignee
STATE GRID XINYUAN HYDROPOWER CO Ltd
Xinanjiang River Hydraulic Power Plant Of Guo Wangxinyuan Water Power Co Ltd
State Grid Corp of China SGCC
China Institute of Water Resources and Hydropower Research
Beijing IWHR KHL Co Ltd
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Priority to CN201710174269.5A priority Critical patent/CN107192624A/en
Publication of CN107192624A publication Critical patent/CN107192624A/en
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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
    • G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
    • G01N3/34—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by mechanical means, e.g. hammer blows
    • 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
    • G01N2203/003—Generation of the force
    • G01N2203/0032—Generation of the force using mechanical means
    • G01N2203/0039—Hammer or pendulum
    • 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
    • G01N2203/0058—Kind of property studied
    • G01N2203/0076—Hardness, compressibility or resistance to crushing
    • G01N2203/0087—Resistance to crushing

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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 Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The present invention relates to a kind of concrete strength detecting method based on impact elasticity ripple, comprise the following steps：S1：Calculate the R ripple velocities of wave V in the range of concrete different depth to be measuredR；S2：According to the R ripple velocities of wave V of concrete to be measuredRCalculate the P ripple velocities of wave V of concrete to be measuredP, unit is m/s；S3：According to the P ripple velocities of wave V of concrete to be measuredPCalculate the compression strength f of concrete to be measuredc, unit is MPa.The concrete strength detecting method based on impact elasticity ripple that the present invention is provided, it is simple, convenient, it can be achieved to hydraulic large-volume concrete internal intensity large area quick detection.

Description

A kind of concrete strength detecting method based on impact elasticity ripple
Technical field
The present invention relates to hydraulic engineering technical field, and in particular to a kind of concrete strength inspection based on impact elasticity ripple Method.
Background technology
Concrete is the important materials in the infrastructure constructions such as water conservancy, water power, and the quality of its quality is often related to whole The safety of individual engineering.Hydraulic large-volume concrete structure, such as dam, ship lock, flood releasing structure, Power Plant, volume is big, knot Configuration gesture is complicated and service condition is more severe, concrete structure under arms during, due to the effect by load and extraneous ring The influence of border factor, may result in concrete structure and occurs damaging and deteriorate, the serious peace for even jeopardizing all the building Entirely.Therefore, periodically concrete quality should be detected in the hydro-structure runtime, it is ensured that the quality of hydraulic structure concrete Design requirement is met, is necessary.
Concrete strength is to reflect one of important indicator of concrete quality situation, is also structural stress and stable checking gauge The important parameter of calculation.Therefore, to the detection and evaluation of concrete strength, to ensureing that the safe operation of Hydro-concrete Structures has Very important meaning.At present, the detection method of concrete strength mainly has rebound method, core drilling method, ultrasonic comprehensive rebound method etc., It is equal for hydraulic large-volume concrete intensity detection although the above method is widely used in the detection of concrete structural strength In the presence of it is certain the problem of：
(1) core drilling method.Factor about core-drilling test concrete strength has direct, reliable, accurate advantage, but can be to concrete knot Local damage is configured to, a large amount of corings can only be accomplished detection a little by a definite limitation, comprehensive inadequate；
(2) rebound method.Rebound method is that the compression strength of concrete is estimated by testing concrete surface hardness, operation letter Just, can carry out large-scale detection, but can only reflect concrete surface layer strength condition, and be carbonized, the factor such as age Influence is larger, has certain limitation in terms of the intensity detection of long-age building；
(3) Ultrasonic Resilience Comprehensive Method in Construction.Supercritical ultrasonics technology is because its hammer vibration energy is low, frequency is high, thus penetration capacity is poor, test Scope is small, and is easily influenceed by external interference, the detection of unsuitable mass concrete, and bottom plate, abutment pier, spillway etc. Often only one of which can survey face to hydraulic large-volume concrete, the testing conditions for not possessing Ultrasonic Resilience Comprehensive Method in Construction.
Impact elasticity ripple and ultrasonic wave have no too big difference in itself, belong to the elastic wave propagated in medium, only It is different in terms of the excitation of signal and reception mode, spectral range.Compared with traditional ultrasonic wave, impact elasticity ripple master Have the characteristics that：(1) impact elasticity ripple is excited by jump bit, and energy is big and concentrates, and MTD is significantly improved, can worn Saturating more than 10m concrete.(2) excellent frequency of impact elasticity ripple is general arrives thousands of hertzs hundreds of, and wavelength is longer, by The scattering influence of aggregate particle is small, small by extraneous spuious wave action.(3) live strong applicability, easy to operate, is adapted to big Volume concrete structure carries out quick, complete detection.
It is emphasized that assuming that concrete be perfect elastic body under conditions of, elastic wave (P ripples) speed and concrete Dynamic modulus of elasticity between there is direct theory relation.Because dynamic modulus of elasticity and the intensity of concrete have related pass well System, therefore elastic wave (P ripples) also has preferable dependency relation between speed and intensity, elastic wave velocity can detect for evaluating Section inner concrete Mass Distribution situation.Because it has, energy is big, measuring distance is remote, suitable for spectrum analysis and with mixing The advantages of soil mechanics performance is directly related is coagulated, impact elasticity ripple has been widely used in concrete structure detection field.
Current engineering circles, which still compare, is widely used the p wave interval velocity detection that Leslie and Cheeseman were proposed in 1949 Concrete evaluation criterion, see the table below 1.But, the evaluation criterion is generally used to qualitatively judge the quality of concrete quality, because not Be with the relation between the p wave interval velocity and intensity of concrete it is different, influence factor include aggregate kind, level match somebody with somebody, it is age, aqueous Amount etc..
Table 1 often evaluates concrete quality normative reference with elastic wave (P ripples) velocity of wave
The content of the invention
In order to solve the not enough there is provided one kind is simple, convenient of prior art presence, large area quick detection can be achieved Concrete strength detecting method, the invention provides a kind of concrete strength detecting method based on impact elasticity ripple, it is special Levy and be, comprise the following steps：
S1：Calculate the R ripple velocities of wave V in the range of concrete different depth to be measuredR；
S2：According to the R ripple velocities of wave V of concrete to be measuredRCalculate the P ripple velocities of wave V of concrete to be measuredP, unit is m/s；
S3：According to the P ripple velocities of wave V of concrete to be measuredPCalculate the compression strength f of concrete to be measuredc, unit is MPa.
Wherein, in the step S1, R ripple velocities of wave VRAssay method include：
S11：The survey district center point of concrete to be measured is determined, respectively arranges and adds together along straight line in the survey district center point both sides Velocity sensor；
S12：An impacting point is selected in acceleration transducer side described in per pass, impacting point, acceleration are tapped with jump bit The R ripple signals that sensor collection exciting is produced, according to the R ripples signal of change R ripple velocities of wave VRAnd wavelength XR。
Wherein, the R ripples velocity of wave VRAnd wavelength XRCalculation formula be：
VR=d2/Δt；
λR=VRT；
Wherein, d2For the distance between two acceleration transducers；
Δ t is the R ripple Mintrop waves for the oscillogram for obtaining the signal received by two acceleration transducers after processing The sound time difference；
T is the flat of the R ripple Mintrop waves for the oscillogram for obtaining the signal received by two acceleration transducers after processing The equal cycle.
Wherein, in the step S11, acceleration transducer is arranged in concrete surface by couplant；
In the step S12, concrete surface is smooth at impacting point, and jump bit selects solid spherical jump bit.
Wherein, the distance of impacting point to acceleration transducer closer to the distance is more than distance between two acceleration transducers Two times.
Wherein, the P ripples velocity of wave VPCalculation formula be：
Wherein, VSFor S ripple velocities of wave, μ is Poisson's ratio.
Wherein, the compression strength fcCalculation formula be：
Wherein, a, b are coefficient of relationship.
Wherein, the compression strength fcThe determination method of calculation formula be：
Obtain the compression strength f of concrete core sample test specimencWith apparent p wave interval velocity VP, core, by apparent p wave interval velocity VP, coreChange Calculate as three-dimensional p wave interval velocity VP, processing is fitted to data using exponential function, P ripples velocity of wave-special song of compression strength is obtained Line, namely compression strength fcCalculation formula.
Wherein, the apparent p wave interval velocity VP, coreAcquisition methods include：
S31：Matched somebody with somebody according to coagulation soil class, the concrete core sample of predefined size is drilled through on concrete, standard core sample is processed into Test specimen；
S32：In one of acceleration transducer of center placement of standard core sample test specimen；
S33：Tapped with jump bit in acceleration transducer surrounding pre-position, each point taps pre-determined number, make to add The P ripple repeated reflection signals that velocity sensor collection exciting is produced；
S34：The P ripple repeated reflection signals received by acceleration transducer, according to impact echo repeated reflection principle, are surveyed Determine spread speed of the P ripples in concrete standard core sample test specimen, namely apparent p wave interval velocity VP, core。
Wherein, in the step S33, the standard core sample test specimen is placed on foam-rubber cushion, and the jump bit used is The spherical jump bit of steel.
The concrete strength detecting method based on impact elasticity ripple that the present invention is provided, it is simple, convenient, achievable pair Hydraulic large-volume concrete internal intensity large area quick detection.
Brief description of the drawings
Fig. 1：The present invention is determining R ripple velocities of wave VRWhen, impacting point arranges pictorial diagram with acceleration transducer；
Fig. 2：The present invention is determining R ripple velocities of wave VRWhen, impacting point arranges schematic diagram with acceleration transducer；
Fig. 3：The present invention is determining R ripple velocities of wave VRWhen detection principle diagram.
Embodiment
Further understand to have to technical scheme and beneficial effect, coordinate accompanying drawing to describe in detail below Technical scheme and its beneficial effect of generation.
Fig. 1-Fig. 2 is respectively that the present invention is determining R ripple velocities of wave VRWhen, impacting point and acceleration transducer arrange pictorial diagram and Arrange schematic diagram；Fig. 3 is determining R ripple velocities of wave V for the present inventionRWhen detection principle diagram.
As shown in Figure 1-Figure 3, the invention provides a kind of concrete strength detecting method based on impact elasticity ripple, including Following steps：
S1：Calculate the R ripple velocities of wave V in the range of concrete different depth to be measuredR；
S2：According to the R ripple velocities of wave V of concrete to be measuredRCalculate the P ripple velocities of wave V of concrete to be measuredP, unit is m/s；
S3：According to the P ripple velocities of wave V of concrete to be measuredPCalculate the compression strength f of concrete to be measuredc, unit is MPa.
When it is implemented, R ripple velocities of wave VRAssay method include：
S11：Determine survey district center point (the i.e. centre of two acceleration transducers on right side in Fig. 1 of concrete to be measured Point), one acceleration transducer (i.e. P in Fig. 2 is respectively arranged along straight line in the survey district center point both sides1And P2Corresponding position)；
S12：An impacting point (i.e. G points position in Fig. 1) is selected in acceleration transducer side described in per pass, with impact Hammer taps impacting point, the R ripple signals that acceleration transducer collection exciting is produced, according to the R ripples signal of change R ripple velocities of wave VRAnd Wavelength XR。
Wherein, the R ripples velocity of wave VRAnd wavelength XRCalculation formula be：
VR=d2/Δt；
λR=VRT；
Wherein, d2For the distance between two acceleration transducers；
Δ t is the R ripple Mintrop waves for the oscillogram for obtaining the signal received by two acceleration transducers after processing The sound time difference；
T is the flat of the R ripple Mintrop waves for the oscillogram for obtaining the signal received by two acceleration transducers after processing The equal cycle.
Specifically, tapping concrete surface in G points using jump bit excites elastic wave, P1And P2The acceleration transducer at place Signal is received, the detection principle diagram (oscillogram) shown in Fig. 3 will can be obtained after signal transacting, the R of channel 1 and channel 2 is read Ripple Mintrop wave half period T1/ 2 and T2/ 2, multiplied by with 2 after being averaged, draw T average period of R ripple Mintrop waves；According to channel 1 and channel 2 R ripple Mintrop waves sound time difference Δ t and the distance between two acceleration transducers d2, R is calculated according to above-mentioned formula successively Ripple velocity of wave VRAnd wavelength XR。
In the present invention, the grade effect spread depth of the R ripples is propagation wavelength XRHalf, that is, R ripples wait the effect spread deep Spend for λR/ 2, R ripple velocity of wave VRWhat is represented is the average value for waiting R ripple velocities of wave in effect spread depth bounds.
Exciting is carried out in concrete surface with various sizes of jump bit, the R ripples signal of different frequency can be produced to control R Ripple wavelength, so as to obtain the R ripple velocities of wave in the range of different depth.
Preferably, in order to ensure in good contact, the step S11, acceleration transducer is arranged in by couplant Concrete surface；Also, in the step S12, concrete surface is smooth at impacting point, and jump bit selects solid spherical impact Hammer.
Preferably, distance of the impacting point to acceleration transducer (the P1 acceleration transducers shown in Fig. 2) closer to the distance (the d shown in Fig. 21) it is more than the distance (d shown in Fig. 2 between two acceleration transducers2) two times.
Specifically, the surface for assuming determined concrete is preferable semi-infinite elastic solid surface, then the P ripples velocity of wave VPCalculation formula be：
Wherein, VSFor S ripple velocities of wave, μ is Poisson's ratio.
As can be seen here, on preferable concrete semi-infinite elastic solid surface, (the positive reason after Poisson's ratio of concrete is determined It is general 0.20 or so under condition), R ripple velocities of wave VRAnd P ripple velocities of wave VPThere is theoretic numerical value corresponding relation.
Specifically, the compression strength fcCalculation formula be：
Wherein, a, b are coefficient of relationship.
Wherein, the compression strength fcThe determination method of calculation formula be：
Obtain the compression strength f of concrete core sample test specimencWith apparent p wave interval velocity VP, core, by apparent p wave interval velocity VP, coreChange Calculate as three-dimensional p wave interval velocity VP, processing is fitted to data using exponential function, P ripples velocity of wave-special song of compression strength is obtained Line, namely compression strength fcCalculation formula.
Wherein, the apparent p wave interval velocity VP, coreAcquisition methods include：
S31：Matched somebody with somebody according to coagulation soil class, the concrete core sample of predefined size is drilled through on concrete, standard core sample is processed into Test specimen；
S32：In one of acceleration transducer of center placement of standard core sample test specimen；
S33：Tapped with jump bit in acceleration transducer surrounding pre-position, each point taps pre-determined number, make to add The P ripple repeated reflection signals that velocity sensor collection exciting is produced；
S34：The P ripple repeated reflection signals received by acceleration transducer, according to impact echo repeated reflection principle, are surveyed Determine spread speed of the P ripples in concrete standard core sample test specimen, namely apparent p wave interval velocity VP, core。
Wherein, in the step S33, the standard core sample test specimen is placed on foam-rubber cushion, and the jump bit used is The spherical jump bit of steel, more preferably, selection use a diameter of 17mm spherical jump bit of steel.
In the specific embodiment of the present invention, the apparent p wave interval velocity VP, coreObtaining step be：
S31：Matched somebody with somebody according to coagulation soil class, drilled through in test object(or ) concrete core sample, be processed into ratio of height to diameter for 1:1 standard core sample test specimen；
S32：In one of acceleration transducer of center placement of standard core sample test specimen；
S33：With the spherical jump bit of diameter 17mm steel along sensor surrounding every 90 ° of angles in 2~4cm of range sensor (suitably being adjusted according to sample dimensions) place is tapped, and each point is tapped 2 times, acceleration transducer is gathered what exciting was produced Elastic wave data；
S34：The elastic wave repeated reflection signal received by acceleration transducer, it is former according to impact echo repeated reflection Reason, determines spread speed of the P ripples in concrete standard core sample test specimen, namely apparent p wave interval velocity VP, core。
Therefore, the method provided according to the present invention, can determine P ripples velocity of wave-special song of compression strength by step S3 in advance Line, disposes acceleration transducer and jump bit, sequentially determining R ripples by the different test positions correspondence to concrete to be measured afterwards Velocity of wave VRAnd P ripple velocities of wave VP, you can finally try to achieve the compression strength that each position of concrete to be measured goes out.
The concrete strength detecting method based on impact elasticity ripple that the present invention is provided, it is simple, convenient, achievable pair Hydraulic large-volume concrete internal intensity large area quick detection.
Although the present invention is illustrated using above-mentioned preferred embodiment, so it is not limited to protection model of the invention Enclose, any those skilled in the art are not being departed within the spirit and scope of the present invention, various become is carried out with respect to above-described embodiment It is dynamic still to belong to the scope that the present invention is protected with modification, therefore protection scope of the present invention is by being defined that claims are defined.

Claims (10)

1. a kind of concrete strength detecting method based on impact elasticity ripple, it is characterised in that comprise the following steps：
S1：Calculate the R ripple velocities of wave V in the range of concrete different depth to be measuredR；
S2：According to the R ripple velocities of wave V of concrete to be measuredRCalculate the P ripple velocities of wave V of concrete to be measuredP, unit is m/s；
S3：According to the P ripple velocities of wave V of concrete to be measuredPCalculate the compression strength f of concrete to be measuredc, unit is MPa.
2. the concrete strength detecting method as claimed in claim 1 based on impact elasticity ripple, it is characterised in that the step In S1, R ripple velocities of wave VRAssay method include：
S11：The survey district center point of concrete to be measured is determined, one of acceleration is respectively arranged along straight line in the survey district center point both sides Sensor；
S12：An impacting point is selected in acceleration transducer side described in per pass, impacting point, acceleration sensing are tapped with jump bit The R ripple signals that device collection exciting is produced, according to the R ripples signal of change R ripple velocities of wave VRAnd wavelength XR。
3. the concrete strength detecting method as claimed in claim 2 based on impact elasticity ripple, it is characterised in that the R ripples Velocity of wave VRAnd wavelength XRCalculation formula be：
VR=d2/Δt；
λR=VRT；
Wherein, d2For the distance between two acceleration transducers；
When Δ t is the sound of the R ripple Mintrop waves for the oscillogram for obtaining the signal received by two acceleration transducers after processing Difference；
T is the average week of the R ripple Mintrop waves for the oscillogram for obtaining the signal received by two acceleration transducers after processing Phase.
4. the concrete strength detecting method as claimed in claim 2 based on impact elasticity ripple, it is characterised in that
In the step S11, acceleration transducer is arranged in concrete surface by couplant；
In the step S12, concrete surface is smooth at impacting point, and jump bit selects solid spherical jump bit.
5. the concrete strength detecting method as claimed in claim 2 based on impact elasticity ripple, it is characterised in that impacting point is arrived The distance of acceleration transducer closer to the distance is more than two times of distance between two acceleration transducers.
6. the concrete strength detecting method as claimed in claim 1 based on impact elasticity ripple, it is characterised in that the P ripples Velocity of wave VPCalculation formula be：
<mrow> <msub> <mi>V</mi> <mi>S</mi> </msub> <mo>=</mo> <mfrac> <mrow> <mn>1</mn> <mo>+</mo> <mi>&amp;mu;</mi> </mrow> <mrow> <mn>0.87</mn> <mo>+</mo> <mn>1.12</mn> <mi>&amp;mu;</mi> </mrow> </mfrac> <msub> <mi>V</mi> <mi>R</mi> </msub> </mrow>
<mrow> <msub> <mi>V</mi> <mi>P</mi> </msub> <mo>=</mo> <msqrt> <mfrac> <mrow> <mn>2</mn> <mo>-</mo> <mn>2</mn> <mi>&amp;mu;</mi> </mrow> <mrow> <mn>1</mn> <mo>-</mo> <mn>2</mn> <mi>&amp;mu;</mi> </mrow> </mfrac> </msqrt> <msub> <mi>V</mi> <mi>S</mi> </msub> </mrow>
Wherein, VSFor S ripple velocities of wave, μ is Poisson's ratio.
7. the concrete strength detecting method as claimed in claim 1 based on impact elasticity ripple, it is characterised in that the resistance to compression Intensity fcCalculation formula be：
<mrow> <msub> <mi>f</mi> <mi>c</mi> </msub> <mo>=</mo> <mi>a</mi> <mo>&amp;CenterDot;</mo> <msup> <mi>e</mi> <mrow> <msub> <mi>V</mi> <mi>P</mi> </msub> <mo>&amp;CenterDot;</mo> <mi>b</mi> </mrow> </msup> <mo>;</mo> </mrow>
Wherein, a, b are coefficient of relationship.
8. the concrete strength detecting method as claimed in claim 7 based on impact elasticity ripple, it is characterised in that the resistance to compression Intensity fcThe determination method of calculation formula be：
Obtain the compression strength f of concrete core sample test specimencWith apparent p wave interval velocity VP, core, by apparent p wave interval velocity VP, coreIt is scaled Three-dimensional p wave interval velocity VP, processing is fitted to data using exponential function, P ripples velocity of wave-compression strength Special curve is obtained, That is compression strength fcCalculation formula.
9. the concrete strength detecting method as claimed in claim 8 based on impact elasticity ripple, it is characterised in that described apparent P wave interval velocity VP, coreAcquisition methods include：
S31：Matched somebody with somebody according to coagulation soil class, the concrete core sample of predefined size is drilled through on concrete, be processed into standard core sample test specimen；
S32：In one of acceleration transducer of center placement of standard core sample test specimen；
S33：Tapped with jump bit in acceleration transducer surrounding pre-position, each point taps pre-determined number, makes acceleration The P ripple repeated reflection signals that sensor collection exciting is produced；
S34：The P ripple repeated reflection signals received by acceleration transducer, according to impact echo repeated reflection principle, determine P Spread speed of the ripple in concrete standard core sample test specimen, namely apparent p wave interval velocity VP, core。
10. the concrete strength detecting method as claimed in claim 9 based on impact elasticity ripple, it is characterised in that the step In rapid S33, the standard core sample test specimen is placed on foam-rubber cushion, and the jump bit used is the spherical jump bit of steel.
CN201710174269.5A 2017-03-22 2017-03-22 A kind of concrete strength detecting method based on impact elasticity ripple Pending CN107192624A (en)

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CN111948289A (en) * 2020-08-24 2020-11-17 四川升拓检测技术股份有限公司 Concrete cold joint quality detection method, device and system based on impact elastic wave
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CN108362580B (en) * 2018-01-22 2020-12-04 武汉路通市政工程质量检测中心 Method for detecting concrete strength of structural solid by impact elastic wave method
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CN109239316B (en) * 2018-08-08 2021-05-18 哈尔滨工业大学（深圳） Concrete strength monitoring method based on concrete strength monitoring device
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CN109212030A (en) * 2018-10-12 2019-01-15 华北水利水电大学 A kind of accurate detection device of steel core concrete column compactness
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