CN100495033C - Method for comprehensively determining compression strength of sand concrete by supersonic resilience - Google Patents
Method for comprehensively determining compression strength of sand concrete by supersonic resilience Download PDFInfo
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- CN100495033C CN100495033C CNB2005100031227A CN200510003122A CN100495033C CN 100495033 C CN100495033 C CN 100495033C CN B2005100031227 A CNB2005100031227 A CN B2005100031227A CN 200510003122 A CN200510003122 A CN 200510003122A CN 100495033 C CN100495033 C CN 100495033C
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Abstract
A method for detecting compression strength of mountain sand concrete by ultrasonic resilience technique includes preparing concrete structure by mountain sand in particle size 0.008 - 8.0 mm and with intensity 10 - 50 Mpa for normal and 50 - 90 Mpa for high strength at unit weight between 2200 - 2800 Kg / cu.m; using nonmetal ultrasonic detector with 50 - 100 kH2 transducer, 2.2 Joule or 5.5 Joule of resiliometer and 0 - 8 mm carbonization depth detector as detecting tool; using set method and formula to select detection point and to calculate out concrete compression strength .
Description
Technical field
The present invention relates to a kind of detection method, particularly a kind of non-damage detection method of on-site concrete compressive strength.
Background technology
Usually the detection of concrete crushing strength is to adopt the test specimen of moulding concrete cube in advance (on pressure testing machine, to carry out the method that pressure test is obtained concrete compression strength value as 10 * 10 * 10cm, 15 * 15 * 15cm, 20 * 20 * 20cm).
The on-the-spot non-damage detection method of concrete crushing strength is an emerging technology in developing and improving, and still is in the exploratory stage.For example: in xoncrete structure that is used in construction project or member, unit weight is at 2200～2800kg/m
3Between, intensity adopts the rock sand concrete of particle diameter 0.08～8.0mm mountain sand preparation between 10MPa～90MPa.Because detection method and technical requirement is uncertain, the conclusion that obtains is widely different, is difficult to reflect concrete compressive strength exactly, usually causes dispute.
Summary of the invention
The objective of the invention is to, a kind of determining compression strength of sand concrete by supersonic resilience comprehensively method is provided.In xoncrete structure that is used in construction project or member, unit weight is at 2200～2800kg/m
3Between, compressive strength is at 10MPa～90MPa, and the rock sand concrete of particle diameter 0.08～8.0mm mountain sand preparation adopts the present invention can reflect concrete compressive strength index exactly.
Technical scheme of the present invention.The determining compression strength of sand concrete by supersonic resilience comprehensively method is characterized in that: undertaken by following step;
Determining of a, detected object: be used for the xoncrete structure or the member of construction project, its unit weight is at 2200～2800kg/m
3Between, intensity adopts the concrete of particle diameter in the preparation of 0.08～8.0mm mountain sand at 10MPa～90MPa;
Determining of b, testing tool: 10～50 intensity sections employing impact energy is 2.2 joules a medium-sized reisilometer, and 50～90 intensity sections employing impact energy is 5.5 joules a high-strength reisilometer; 0～8mm concrete carbonization depth analyzer; Be furnished with the nonmetal ultrasonic detector of frequency at the band waveform oscilloscope of 50～100kHz transducer;
C, detection method: for single structure or member, get and be no less than 10 and survey the district, each is surveyed to survey earlier in the district and reads 16 resilience readings; Reading when reading 3 ultrasonic propagation sound is surveyed in the back; On structure or member that resilience and ultrasonic mensuration finish, choose again and be no less than the mensuration that 30% survey district carries out concrete carbonization depth;
D, measured value handle: the acoustic velocity value that the ratio of reading and range reading when ultrasonic velocity velocity of propagation in concrete be sound, 3 arithmetic mean are distinguished for this survey (v); Reject 3 maximum numbers and 3 minimum numbers from survey 16 the resilience readings in district, the arithmetic mean of remaining 10 resilience readings is surveyed the rebound value (R) in district for this; Getting the arithmetic mean of repeatedly measuring is the carbonation depth value (d) of tested member;
E, when detected concrete strength grade during at 10MPa～50MPa, the actual strength of rock sand concrete is drawn by following formula,
Intensity
(common section)=0.004199 * v
2.2225* R
(medium-sized) 1.5531* d
-0.141
When detected concrete strength grade during at 50MPa～90MPa, the actual strength of rock sand concrete is drawn by following formula,
Intensity
(high-strength section)=0.0672 * v
0.098* R
(high-strength) 1.857
Above-mentioned determining compression strength of sand concrete by supersonic resilience comprehensively method, the survey district among the step c should satisfy, and area is not less than 0.02m
2, adjacent two spacings of surveying the district are no more than 3m; 16 resilience readings that survey is read should satisfy, and each measuring point is evenly distributed on to be surveyed in the district, and the clear distance of adjacent two measuring points is not less than 30mm; During 3 sound that survey is read during reading, measuring point survey the district planted agent be "
" shape is evenly distributed on and surveys in the district.
Aforesaid determining compression strength of sand concrete by supersonic resilience comprehensively method, when having by the batch detection requirement among the step c, 30% and the institute structure of getting or the number of components of answering the pickup number to be not less than structure or member sum must not be less than 10 and detect.
Aforesaid determining compression strength of sand concrete by supersonic resilience comprehensively method, medium-sized reisilometer among the step b is meant that the elastic hammer impingement length is that 75mm, elastic stem front end spherical radius are that 25mm, Rockwell's hardness are that its rate definite value is 80 ± 2 medium-sized reisilometer on the riveting stake of HRC60 ± 2; High-strength reisilometer is meant that the elastic hammer impingement length is that 100mm, elastic stem front end spherical radius are that 18.0mm, Rockwell's hardness are that its rate definite value is 83 ± 2 high-strength reisilometer on the riveting stake of HRC 60 ± 2.Aforesaid determining compression strength of sand concrete by supersonic resilience comprehensively method, when measuring during ultrasonic acoustic among the step c, transmitting and receiving transducer lays respectively on the corresponding measuring point in district of respectively testing oneself, and carry out good coupling with coupling agent (as mechanical butter), to guarantee the Mintrop wave wave amplitude, simultaneously with mensuration propagation distance readings such as steel tapes greater than more than 80%.
Compared with the prior art, the present invention is through repeatedly practising, sum up, conclude and screen a kind of detection method towards special object of acquisition.For unit weight at 2200～2800kg/m
3Between, intensity adopts rock sand concrete structure or the member of particle diameter in the preparation of the mountain of 0.08～8.0mm sand at 10MPa～90MPa, adopts the present invention can reflect concrete this mechanical property of compressive strength index exactly.The present invention can directly detect member at the scene, and the right and wrong breakage method that adopts, and the member after can continue to use after testing.In the assessment and judicial expertise that the present invention can be applicable to build after quality control in building construction project and inspection of quality, existed building and the calamity.
Embodiment
Embodiment 1.The determining compression strength of sand concrete by supersonic resilience comprehensively method, undertaken by following step:
The unit weight of a, detected object is 2450kg/m
3About, strength grade is that (10～90MPa), the employing particle diameter is in the concrete of 5mm and the mountain sand preparation below the 5mm, the beam of moulding by casting, 60 days its length of time for C10～C90.
It is 2.2 joules that b, testing tool: C10～C50 intensity section adopts impact energy, and the elastic hammer impingement length is that 75mm, elastic stem front end spherical radius are that 25mm, Rockwell's hardness are that its rate definite value is 80 ± 2 medium-sized reisilometer on the riveting stake of HRC60 ± 2; It is 5.5 joules that C50～C90 intensity section adopts impact energy, and the elastic hammer impingement length is that 100mm, elastic stem front end spherical radius are that 18.0mm, Rockwell's hardness are that its rate definite value is 83 ± 2 high-strength reisilometer on the riveting stake of HRC 60 ± 2.0～8mm concrete carbonization depth analyzer.Is furnished with frequency at the transducer of 50～100kHz and the nonmetal ultrasonic detector of band waveform oscilloscope, as NM3 series, NM4 series and CTS25 etc.Reisilometer, carbonation depth analyzer and nonmetal ultrasonic detector all have the commercially available prod.
C, any 1 beams of concrete of extraction detect.Arrange 10 and survey the district on this beams of concrete, survey area is 0.15 * 0.15m, and adjacent two spacings of surveying the district are got 0.3m; Survey in each surveys the district and read 16 resilience readings, measuring point evenly distributes in surveying the district, and the clear distance of adjacent two measuring points is not less than 30mm and gets measuring point.In each surveys the district, survey reading when reading 3 ultrasonic propagation sound, measuring point be in distinguishing surveying "
" shape evenly distributes.When measuring during ultrasonic acoustic, transmit and receive transducer and lay respectively on the corresponding measuring point in district of respectively testing oneself, and carry out good coupling, to guarantee the Mintrop wave wave amplitude, simultaneously with mensuration propagation distance readings such as steel tapes greater than more than 80% with coupling agent (as mechanical butter).Survey from 10 again and extract the mensuration that 4 survey districts carry out concrete carbonization depth according to a conventional method the district.
When having batch detection to require, the beams of concrete that extracts total radical 30% pursues root and detects.As 10 of the lazy weights that extract by total radical 30%, should get and be no less than 10 and detect.Identical for strength grade of concrete, concrete raw material, match ratio, moulding process, curing condition and the length of time, essentially identical member can be used as same batch.
D, measured value handle: the acoustic velocity value that the ratio of reading and range reading when ultrasonic velocity velocity of propagation in concrete be sound, 3 arithmetic mean are distinguished for this survey (v); Reject 3 maximum numbers and 3 minimum numbers from survey 16 the resilience readings in district, the arithmetic mean of remaining 10 resilience readings is surveyed the rebound value (R) in district for this; Getting the arithmetic mean of repeatedly measuring is the carbonation depth value (d) of tested member.
E, to strength grade when the member of 10MPa～50MPa detects, as, (v) be 4.56 (km/s), rebound value (R) is 41.5, and concrete carbonization depth value (d) is less than 1.00mm, according to intensity to detect the sonic propagation acoustic velocity value obtain
(common section)=0.004199 * v
2.2225* R
(medium-sized) 1.5531* d
-0.141Experimental formula convert, surveying district's intensity conversion value is 39.9MPa.And for example, and the sonic propagation acoustic velocity value that detection obtains (v) be 4.56 (km/s), rebound value (R) 41.5, concrete carbonization depth value (d) is 2.00mm, obtaining to survey district's intensity conversion value is 36.2MPa.
To strength grade when the member of 50MPa～90MPa detects, as, (v) be 4.56 (km/s), rebound value (R) is 41.5, according to intensity to detect the sonic propagation acoustic velocity value obtain
(high-strength section)=0.0672 * v
0.098* R
(high-strength) 1.857Experimental formula convert, surveying district's intensity conversion value is 78.8MPa.
The value of concrete strength of the tested beam that obtains according to said method through cube and two kinds of crash tests checkings of core boring sampling, coincide with the actual quality of measurand.
Method with reference to giving an example can detect other xoncrete structure or the member (Ru Liang, plate, post and wall etc.) of compressive strength at 10MPa～90MPa.
With power function equation (intensity=AV
BR
COr intensity=AV
BR
CD
D) react value of concrete strength, be through experiment repeatedly, and to the data of gathering are summed up, concluded, screening, comparison obtain result.Parameter wherein is 0.004199 as the A of 10～50MPa (common section), and B is 2.2225, and C is 1.5531, and D is-0.141; The A of 50～90MPa (high-strength section) is 0.0672, and B is 0.098, and C is 1.857; And the rock sand concrete of high strength etc. has the characteristics that are not easy to be carbonized, so the factor of no concrete carbonization in the regression equation, the high strength section can not considered concrete carbonization depth value (d) when actual detected; These all are the results who tests repeatedly, returns, analyzes, compares.
Claims (5)
1, determining compression strength of sand concrete by supersonic resilience comprehensively method is characterized in that: undertaken by following step;
Determining of a, detected object: be used for the xoncrete structure or the member of construction project, its unit weight is at 2200～2800kg/m
3Between, intensity adopts the concrete of particle diameter in the preparation of 0.08～8.0mm mountain sand at 10～90MPa;
Determining of b, testing tool: to the rock sand concrete of 10～50MPa, the employing impact energy is 2.2 joules a medium-sized reisilometer; To the rock sand concrete of 50～90MPa, the employing impact energy is 5.5 joules a high-strength reisilometer; 0～8mm concrete carbonization depth analyzer; Be furnished with the nonmetal ultrasonic detector of frequency at the band waveform oscilloscope of 50～100kHz transducer;
C, detection method: for single structure or member, get and be no less than 10 survey districts, each is surveyed to survey earlier in the district and reads 16 resilience readings, reading when reading 3 ultrasonic propagation sound is surveyed in the back, on structure or member that resilience and ultrasonic mensuration finish, choose again and be no less than the mensuration that 30% survey district carries out concrete carbonization depth;
D, measured value are handled: the ratio of reading and range reading when ultrasonic velocity velocity of propagation in concrete is sound, and 3 arithmetic mean is surveyed the acoustic velocity value v in district for this; Reject 3 maximum numbers and 3 minimum numbers from survey 16 the resilience readings in district, the arithmetic mean of remaining 10 resilience readings is surveyed the rebound value R in district for this; Getting the arithmetic mean of repeatedly measuring is the carbonation depth value d of tested member;
E, when detected concrete strength grade during at 10～50MPa, the actual strength of rock sand concrete is drawn by following formula,
Intensity
(common section)=0.004199 * v
2.2225* R
(medium-sized) 1.5531* d
-0.141
When detected concrete strength grade during at 50～90MPa, the actual strength of rock sand concrete is drawn by following formula,
Intensity
(high-strength section)=0.0672 * v
0.098* R
(high-strength) 1.857
2, determining compression strength of sand concrete by supersonic resilience comprehensively method according to claim 1 is characterized in that: the survey district among the step c should satisfy, and area is not less than 0.02m
2, adjacent two spacings of surveying the district are no more than 3m; 16 resilience readings that survey is read should satisfy, and each measuring point is evenly distributed on to be surveyed in the district, and the clear distance of adjacent two measuring points is not less than 30mm; During 3 sound that survey is read during reading, measuring point survey the district planted agent be "
" shape is evenly distributed on and surveys in the district.
3, determining compression strength of sand concrete by supersonic resilience comprehensively method according to claim 2, it is characterized in that: when having by the batch detection requirement among the step c, 30% and the institute structure of getting or the number of components of answering the pickup number to be not less than structure or member sum must not be less than 10 and detect.
4, determining compression strength of sand concrete by supersonic resilience comprehensively method according to claim 3, it is characterized in that: the medium-sized reisilometer among the step b is meant that the elastic hammer impingement length is that 75mm, elastic stem front end spherical radius are that 25mm, Rockwell's hardness are that its rate definite value is 80 ± 2 medium-sized reisilometer on the riveting stake of HRC60 ± 2; High-strength reisilometer is meant that the elastic hammer impingement length is that 100mm, elastic stem front end spherical radius are that 18.0mm, Rockwell's hardness are that its rate definite value is 83 ± 2 high-strength reisilometer on the riveting stake of HRC60 ± 2.
5, determining compression strength of sand concrete by supersonic resilience comprehensively method according to claim 4, it is characterized in that: when measuring during ultrasonic acoustic among the step c, transmitting and receiving transducer lays respectively on the corresponding measuring point in district of respectively testing oneself, and carry out good coupling with coupling agent, to guarantee the Mintrop wave wave amplitude, measure acoustic beam propagation distance value with steel tape simultaneously greater than 80%.
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| CN101320017B (en) * | 2007-06-08 | 2010-07-21 | 武汉中科智创岩土技术有限公司 | Method for detecting head wave of sound wave transmission method |
| CN101852705A (en) * | 2010-06-18 | 2010-10-06 | 南京理工大学 | Method for evaluating dynamic damage of material under repeated impacts |
| CN101915807B (en) * | 2010-07-13 | 2012-01-04 | 河海大学 | Ultrasonic testing auxiliary device in nonmetallic material failure process |
| CN101975848B (en) * | 2010-08-13 | 2013-07-10 | 上海建工（集团）总公司 | Concrete strength evaluation method |
| CN107271280A (en) * | 2017-06-19 | 2017-10-20 | 山西省交通科学研究院 | A kind of impact echo resilience Comprehensive Assessment concrete crushing strength method |
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| CN109781847B (en) * | 2019-01-23 | 2021-06-11 | 湘潭大学 | Method for detecting concrete slump through sound waves |
| CN112432872A (en) * | 2019-08-26 | 2021-03-02 | 朱韦光 | Ternary strength measurement curve of concrete |
| WO2021184240A1 (en) * | 2020-03-18 | 2021-09-23 | 东莞市唯美陶瓷工业园有限公司 | Non-destructive testing method for elastic modulus of fine ceramic, apparatus, and storage medium |
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| CN111208201B (en) * | 2020-03-18 | 2023-04-07 | 东莞市唯美陶瓷工业园有限公司 | Nondestructive testing method and device for damage strength of inorganic nonmetal plate and storage medium |
| CN111595950B (en) * | 2020-05-25 | 2022-05-24 | 湘潭大学 | Method for detecting concrete joint surface strength by using sound waves |
| 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 |
| CN113324863A (en) * | 2021-06-28 | 2021-08-31 | 上海绿地建设(集团)有限公司第五分公司 | Rapid nondestructive testing method for surface wave construction quality of building construction |
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