CN104251882A - Establishment method of concrete compression strength curve - Google Patents
Establishment method of concrete compression strength curve Download PDFInfo
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- CN104251882A CN104251882A CN201410519659.8A CN201410519659A CN104251882A CN 104251882 A CN104251882 A CN 104251882A CN 201410519659 A CN201410519659 A CN 201410519659A CN 104251882 A CN104251882 A CN 104251882A
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Abstract
The invention discloses an establishment method of a concrete compression strength curve. The establishment method of the concrete compression strength curve comprises the following steps: adopting a new standard ultrasonic rebound comprehensive method to detect concrete strength, and establishing a locally dedicated curve of the concrete compression strength detected by the ultrasonic rebound comprehensive method through experiments and statistical analysis of data so as to obtain an ultrasonic rebound detected strength regression formula. The locally dedicated curve for the concrete compression strength which is legally detected by the local ultrasonic rebound comprehensive method is established; the curve is more reliable than the nationally unified strength measurement curve, and significant for increasing the detection level; the curve shows a good linear relation with a sound velocity by a level detection method; furthermore, by the level detection method, in the practical application, only one side is detected to avoid the difficulty that centering is not accurate and the other side cannot be tested, and the establishment is better in operation; the detected flat detection sound velocity is corrected in proportionality coefficient, and then substituted in the locally strength measurement formula to presume the strength value, so that the problem that the strength of the concrete member is detected by the level detection method is effectively solved.
Description
Technical field
The invention belongs to technical field of concrete, particularly relate to a kind of method for building up of concrete crushing strength curve.
Background technology
Current country adopts unified Ultrasonic-rebound method overall approach to detect concrete crushing strength curve, but because the starting material of different regions, weather conditions and construction technology etc. exist a great difference, there is larger difference between the intensity level causing each department to adopt national strength test curve to derive and actual strength value, therefore set up local overall approach strength test curve and there is obvious engineering significance and practical application value.
Summary of the invention
The object of the present invention is to provide a kind of method for building up of concrete crushing strength curve, be intended to set up local overall approach strength test curve, improve concrete crushing strength detection level.
The present invention realizes like this, a kind of method for building up of concrete crushing strength curve adopts new criteria Ultrasonic Resilience Comprehensive Method in Construction to detect concrete strength, the local Special curve that Ultrasonic-rebound method overall approach detects concrete crushing strength is set up by experiment with data statistic analysis, show that ultrasonic rebound surveys strong regression formula, concrete steps are as follows:
Step one, test specimen make, adopt local Portland cement, rubble coarse aggregate, river sand fine aggregate, tap water for test starting material, by local through the good mix-design different intensity grades of practical application situation, each strength grade makes the test specimen in N number of N number of length of time altogether, make the test specimen of M standard-sized test specimen and an off-standard size each length of time, the test specimen in the same length of time requires completing on the same day;
Step 2, test specimen take to simulate maintenance under the natural conditions in building site, and curing temperature, close to 20 DEG C, is stacked in " product " font, covered straw bag water seasoning, and down, upward, side can abundant ingress of air for end face in bottom surface;
Step 3, after test specimen reaches the length of time, carry out sound transit-time measurement, the side of getting test block pouring direction is test surfaces, probe is smeared with couplant, first sound transit-time measurement adopts sound duration survey method being tested on the relative test surfaces of standard-sized test specimen to 3 points, at measurement sound constantly, ensure that probe should be point-blank, using the air line distance between probe as velocity of sound basis, to arrive the wavefront of receiving transducer at first as the foundation surveyed when reading sound, because Mintrop wave start position is subject to the impact of Received signal strength amplitude size and waveform, so be as the criterion with the starting point of the sine wave of the first amplitude 30 ~ 40mm when interpretation, secondly to the test specimen of same off-standard size carry out flat survey method with to the method for survey contrast test, select test specimen long side surface as flat survey face, get 7 measuring points, sound duration is recorded by flat survey method, " time-distance " method regression formula is used to try to achieve the flat survey method velocity of sound again, then at two end faces of off-standard size test specimen as to side, test 3 to the sound duration on measuring point, acoustic velocity value is obtained by conventional method,
Step 4, rebound value are tested, two of standard size test specimen opposite flanks are placed between pressing machine board, pressurization 30kN ~ 80kN, with the rebound value of reisilometer to standard specimen test two relative side, equally distributed 8 measuring points are selected in each side, each test specimen 16 rebound values deduct 3 maximal values and 3 minimum value, average for remaining 10, must the average rebound number Ra of this test specimen;
Step 5, strength test: recording the breaking limit load of test specimen on pressing machine is subsequently concrete cubic compressive strength.
Step 6, according to standard specimen, computational analysis is carried out to the duration of survey method test gained sound, rebound value, compression strength value, adopt regression equation f
c cu=A (V
a)
b(R
a)
c, the curve that this area Ultrasonic Resilience Comprehensive Method in Construction detects normal concrete intensity is set up in programming matching;
Step 7, according to the test specimen of same off-standard size being carried out to flat to survey and to survey method simultaneously, " time-distance " analyze and try to achieve the flat survey velocity of sound, conventional method calculates the survey velocity of sound, then carrying out the data statistic analysis of each strength grade concrete sample in each length of time, obtaining the ratio coefficient to surveying method bulk sound velocity value and flat survey method bulk sound velocity value.
Further, in concrete strength Non-Destructive Testing, ultrasonic transducer has survey or flat survey two kinds layout usually, flat survey method with have deviation to the acoustic velocity value of the method for survey, simply flat survey acoustic velocity value that method is surveyed can not be substituted into area and survey strong formula, but needs just can carry out practical application after revising flat survey method measured value.
Further, the concrete sample adopting conventional method to carry out different larval instar surveys comparative determination to survey peace, and adopt regression formula to determine to survey to surveying peace the scale-up factor detecting acoustic velocity value, when flat survey method can only be used to carry out concrete works intensity detection, directly institute's lining can be surveyed after acoustic velocity value carries out the correction of scale-up factor and substitute into the strong formula presumption of strength value of area survey.
effect gathers
The present invention establishes the local Special curve that regional Ultrasonic-rebound method overall approach detects concrete crushing strength by experiment with data statistic analysis, curve precision is higher, compare unification of the motherland strength test curve and have more reliability, achievement in research has filled up local construction system does not have ultrasonic rebound to detect the blank of strength test curve achievement, can detect for my area structure and due effect is played in concrete quality inspection, for improving, insolation level is significant.To survey method acoustic velocity value and flat survey method acoustic velocity value, there is good linear relationship, and flat survey method only tests with a face difficulty avoiding centering and forbidden and cannot test another side in actual applications, has better operability.Institute's lining is surveyed after acoustic velocity value carries out the correction of scale-up factor and substitute into the strong formula presumption of strength value of area survey, efficiently solve the difficult problem adopting flat survey method to detect concrete component intensity.
Accompanying drawing explanation
Fig. 1 is the method for building up process flow diagram of the concrete crushing strength curve that the embodiment of the present invention provides.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
The present invention, is described in further detail the present invention for specific embodiment with the method for building up of Yueyang Area concrete crushing strength curve.
The method for building up of described concrete crushing strength curve adopts new criteria Ultrasonic Resilience Comprehensive Method in Construction to detect concrete strength, the local Special curve that Ultrasonic-rebound method overall approach detects concrete crushing strength is set up by experiment with data statistic analysis, show that ultrasonic rebound surveys strong regression formula, concrete steps are as follows:
S101: test specimen makes, adopt local Portland cement, rubble coarse aggregate, river sand fine aggregate, tap water for test starting material, by local through the good mix-design different intensity grades of practical application situation, each strength grade makes the test specimen in N number of N number of length of time altogether, make the test specimen of M standard-sized test specimen and an off-standard size each length of time, the test specimen in the same length of time requires completing on the same day;
Concrete grammar is: the Portland cement adopting local 32.5 and 42.5 strength grades in Yueyang, the rubble coarse aggregate of particle diameter between 15 ~ 40mm (lake stone and river stone), local river sand fine aggregate (medium sand), tap water is test starting material, by local through the good mix-design of practical application situation 7 strength grade: C10, C15, C20, C25, C30, C35, C40, each strength grade makes 7d, 14d, 28d, 60d, 90d, 180d, the test specimen in 365d totally 7 length of times, make the standard specimen of three 150mm*150mm*150mm and the test specimen of a 150mm*150mm*600mm each length of time, the test specimen in the same length of time requires completing on the same day.
S102: test specimen takes to simulate maintenance under the natural conditions in building site, and curing temperature, close to 20 DEG C, is stacked in " product " font, covered straw bag water seasoning, down, upward, side can abundant ingress of air for end face in bottom surface;
S103: after test specimen reaches the length of time, carry out sound transit-time measurement, the side of getting test block pouring direction is test surfaces, probe is smeared with couplant, first sound transit-time measurement adopts sound duration survey method being tested on the relative test surfaces of standard specimen to 3 points, at measurement sound constantly, ensure that probe should be point-blank, using the air line distance between probe as velocity of sound basis, to arrive the wavefront of receiving transducer at first as the foundation surveyed when reading sound, because Mintrop wave start position is subject to the impact of Received signal strength amplitude size and waveform, so be as the criterion with the starting point of the sine wave of the first amplitude 30 ~ 40mm when interpretation, secondly to the test specimen of same off-standard size carry out flat survey method with to the method for survey contrast test, select test specimen long side surface as flat survey face, get 7 measuring points, spacing 50mm, sound duration is recorded by flat survey method, " time-distance " method regression formula is used to try to achieve the flat survey method velocity of sound again, then at two end faces of the test specimen of off-standard size as to side, test 3 to the sound duration on measuring point, acoustic velocity value is obtained by conventional method,
S104: rebound value is tested: be placed between pressing machine board by two of the test specimen of dimensioning opposite flanks, pressurization 30kN ~ 80kN, with the rebound value of reisilometer to standard specimen test two relative side, equally distributed 8 measuring points are selected in each side, each test specimen 16 rebound values deduct 3 maximal values and 3 minimum value, average for remaining 10, must the average rebound number Ra of this test specimen;
S105: strength test, recording the breaking limit load of test specimen on pressing machine is subsequently concrete cubic compressive strength.
S106: according to standard specimen, computational analysis is carried out to the duration of survey method test gained sound, rebound value, compression strength value, adopt regression equation f
c cu=A (V
a)
b(R
a)
c, the curve that this area Ultrasonic Resilience Comprehensive Method in Construction detects normal concrete intensity is set up in programming matching.
The curvilinear equation obtained is f
c cu=0.0037 (V
a)
1.8960(R
a)
1.7568
S107: according to same off-standard size test specimen being carried out to flat to survey and to survey method simultaneously, " time-distance " analyze and try to achieve the flat survey velocity of sound, conventional method calculates the survey velocity of sound, then carrying out the data statistic analysis of each strength grade concrete sample in each length of time, obtaining the ratio coefficient to surveying method bulk sound velocity value and flat survey method bulk sound velocity value.
Further, by the restriction of external environment in concrete strength Non-Destructive Testing, ultrasonic transducer has two kinds of arrangements usually: to survey or flat survey.Be specification to the mode surveyed and test the mode that generally adopts, range finding is clear and definite, precision is good; But practical engineering building structural concrete often there will be only have one can the situation in lining face, as the case beam, concrete road surface, concrete floor, pool wall etc. of bridge, can only by the side of transducer arrangement in structure.Because flat survey method accurately can not determine the actual range in Ultrasonic Detection path, make flat survey method and have deviation to the acoustic velocity value of the method for survey, therefore simply flat survey acoustic velocity value that method is surveyed can not be substituted into area and survey strong formula, but needs just can carry out practical application after revising flat survey method measured value.
Further, the concrete sample adopting conventional method to carry out different larval instar surveys comparative determination to survey peace, and adopt regression formula to determine to survey to surveying peace the scale-up factor detecting acoustic velocity value, when flat survey method can only be used to carry out Yueyang Area concrete works intensity detection, directly institute's lining can be surveyed after acoustic velocity value carries out the correction of scale-up factor and substitute into the strong formula presumption of strength value of area survey.
Although survey acoustic velocity value flat and differ less with to surveying acoustic velocity value, the Strength co-mputation error produced is higher, is enough to illustrate substitute into necessity and the correctness that regional comprehensive methods detects concrete strength formula again after revising flat survey method measured value.Offside method acoustic velocity value and flat survey method acoustic velocity value have good linear relationship, and flat survey method only tests with a face difficulty avoiding centering and forbidden and cannot test another side in actual applications, has better operability.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but not limiting the scope of the invention; one of ordinary skill in the art should be understood that; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various amendment or distortion that performing creative labour can make still within protection scope of the present invention.
Claims (3)
1. the method for building up of a concrete crushing strength curve, it is characterized in that, the method for building up of described concrete crushing strength curve adopts new criteria Ultrasonic Resilience Comprehensive Method in Construction to detect concrete strength, the local Special curve that Ultrasonic-rebound method overall approach detects concrete crushing strength is set up by experiment with data statistic analysis, show that ultrasonic rebound surveys strong regression formula, concrete steps are as follows:
Step one, test specimen make, adopt local Portland cement, rubble coarse aggregate, river sand fine aggregate, tap water for test starting material, by local through the good mix-design different intensity grades of practical application situation, each strength grade makes the test specimen in N number of N number of length of time altogether, make the test specimen of M standard-sized test specimen and an off-standard size each length of time, the test specimen in the same length of time requires completing on the same day;
Step 2, test specimen take to simulate maintenance under the natural conditions in building site, and curing temperature, close to 20 DEG C, is stacked in " product " font, covered straw bag water seasoning, and down, upward, side can abundant ingress of air for end face in bottom surface;
Step 3, after test specimen reaches the length of time, carry out sound transit-time measurement, the side of getting test block pouring direction is test surfaces, probe is smeared with couplant, first sound transit-time measurement adopts sound duration survey method being tested on the relative test surfaces of standard-sized test specimen to 3 points, at measurement sound constantly, ensure that probe should be point-blank, using the air line distance between probe as velocity of sound basis, to arrive the wavefront of receiving transducer at first as the foundation surveyed when reading sound, because Mintrop wave start position is subject to the impact of Received signal strength amplitude size and waveform, so be as the criterion with the starting point of the sine wave of the first amplitude 30 ~ 40mm when interpretation, secondly to the test specimen of same off-standard size carry out flat survey method with to the method for survey contrast test, select test specimen long side surface as flat survey face, get 7 measuring points, sound duration is recorded by flat survey method, " time-distance " method regression formula is used to try to achieve the flat survey method velocity of sound again, then at two end faces of off-standard size test specimen as to side, test 3 to the sound duration on measuring point, acoustic velocity value is obtained by conventional method,
Step 4, rebound value are tested, two of standard size test specimen opposite flanks are placed between pressing machine board, pressurization 30kN ~ 80kN, with the rebound value of reisilometer to standard specimen test two relative side, equally distributed 8 measuring points are selected in each side, each test specimen 16 rebound values deduct 3 maximal values and 3 minimum value, average for remaining 10, must the average rebound number Ra of this test specimen;
Step 5, strength test: recording the breaking limit load of test specimen on pressing machine is subsequently concrete cubic compressive strength;
Step 6, according to standard specimen, computational analysis is carried out to the duration of survey method test gained sound, rebound value, compression strength value, adopt regression equation f
c cu=A (V
a)
b(R
a)
c, the curve that this area Ultrasonic Resilience Comprehensive Method in Construction detects normal concrete intensity is set up in programming matching;
Step 7, according to the test specimen of same off-standard size being carried out to flat to survey and to survey method simultaneously, " time-distance " analyze and try to achieve the flat survey velocity of sound, conventional method calculates the survey velocity of sound, then carrying out the data statistic analysis of each strength grade concrete sample in each length of time, obtaining the ratio coefficient to surveying method bulk sound velocity value and flat survey method bulk sound velocity value.
2. the method for building up of concrete crushing strength curve as claimed in claim 1, it is characterized in that, in concrete strength Non-Destructive Testing, ultrasonic transducer has survey or flat survey two kinds layout usually, flat survey method with have deviation to the acoustic velocity value of the method for survey, simply flat survey acoustic velocity value that method is surveyed can not be substituted into area and survey strong formula, but needs just can carry out practical application after revising flat survey method measured value.
3. the method for building up of concrete crushing strength curve as claimed in claim 1, it is characterized in that, the concrete sample adopting conventional method to carry out different larval instar surveys comparative determination to survey peace, and adopt regression formula to determine to survey to surveying peace the scale-up factor detecting acoustic velocity value, when flat survey method can only be used to carry out concrete works intensity detection, directly institute's lining can be surveyed after acoustic velocity value carries out the correction of scale-up factor and substitute into the strong formula presumption of strength value of area survey.
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