CN109725055A - A method of concrete early freezc performance is evaluated using impact elasticity wave - Google Patents
A method of concrete early freezc performance is evaluated using impact elasticity wave Download PDFInfo
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Abstract
A method of concrete early freezc performance is evaluated using impact elasticity wave.The concrete of winter construction is difficult to correctly grasp its mechanical property because low temperature is endured cold, and quality control on construction is caused to be difficult to ensure, existing evaluation method needs to cause concrete works different degrees of wound mostly, to impact to concrete works.The present invention first establishes elastic wave longitudinal wave velocity and maturity relation curve, the pre-buried temperature sensor in concrete works, frost damege degree detecting is carried out simultaneously when the concrete curing in concrete works to test age and maturity calculates, real impact elastic wave longitudinal wave velocity is obtained by frost damege degree detecting, temperature data, which is provided, according to temperature measuring device calculates concrete works corresponding maturity in test age, counted mature ratio will be counted to concrete impact elasticity wave longitudinal wave velocity and maturity relation curve, obtain the corresponding longitudinal wave velocity of maturation angle value, compare two kinds of impact elasticity wave longitudinal wave velocities to be evaluated again.
Description
Technical field
The invention belongs to concrete NDT fields, and in particular to a method of evaluation concrete early freezc performance.
Background technique
Concrete is a kind of construction material that dosage is maximum in civil engineering, purposes is most wide, in the safe and reliable degree of structure
Absolute with serving in terms of durability, the research and control to concrete quality are especially important.When temperature on average connects round the clock in building site
Continuous 3d referred to as winter construction of concrete lower than 5 DEG C or when the lowest temperature carries out concrete work lower than -3 DEG C, round the clock average air
When temperature refers to highest and lowest average value or local time 6,14 when and when 21 outside air temperature average value.Winter temperature
Low, many construction materials bring many difficulties to construction because freezing into ice containing moisture and then embrittlement occur.Therefore for
The concrete of winter construction, inside contain moisture, temperature is low to will lead to icing, to concrete bring additional strength so that influence
Its mechanical property, it is difficult to which the mechanical property for correctly resting in concrete under winter construction subzero temperature environment leads to winter construction progress
It is affected, quality control on construction is difficult to ensure.In situ concrete strength development cannot promptly and accurately be fed back, construction quality is deposited
It can be greatly promoted in the probability of hidden danger, lack the evaluation method of enduring cold to early freezc concrete at present, needed mostly to coagulation
Geotechnological Cheng Zaocheng different degrees of wound, to impact to concrete works, these methods, which lack, endures cold feelings to concrete
Condition is accurate and quick obtaining means, leads to that winter construction difficulty is big and hidden danger is big.
Summary of the invention
The purpose of the present invention is provide a kind of evaluate using impact elasticity wave using concrete multifunction nondestructive testing instrument to mix
The method of solidifying soil early freezc performance, to solve to freeze due to winter construction concrete, to be difficult to correctly grasp concrete
The problem of mechanical property causes winter construction progress to be affected, and quality control on construction is difficult to ensure.
The technical solution adopted by the present invention to solve the above technical problem is:
A method of concrete early freezc performance is evaluated using impact elasticity wave, comprising:
Standard curing Under Concrete impact elasticity wave longitudinal wave velocity and maturity relation curve are established, is determined to be evaluated
Concrete works, pre-buried temperature sensor carries out temperature data acquisition in concrete works, when the coagulation in concrete works
Frost damege degree detecting is carried out simultaneously when soil maintenance to test age and maturity calculates, and is obtained by frost damege degree detecting
Real impact elastic wave longitudinal wave velocity is taken, temperature data is provided according to temperature measuring device and calculates concrete works in test age
Corresponding maturity, by the mature ratio being calculated to concrete impact elasticity wave longitudinal wave velocity and maturity relation curve,
It obtains corresponding mark of the maturation angle value and supports impact elasticity wave longitudinal wave velocity, compare mark and support impact elasticity wave longitudinal wave velocity and practical punching
Elastic wave longitudinal wave velocity is hit, concrete early freezc performance is evaluated.
As a preferred solution: the establishment process of concrete impact elasticity wave longitudinal wave velocity and maturity relation curve are as follows:
Under the conditions of standard curing, to and the consistent multiple concrete test blocks of concrete works match ratio conserve, when reach test age
When the phase, the test of impact elasticity wave longitudinal wave velocity is carried out under the conditions of standard curing, multiple surveys are determined on each concrete test block
Point obtains the typical value of the concrete impact elasticity wave longitudinal wave velocity under different curing ages, is calculated as according to temperature and age
Ripe degree establishes concrete impact elasticity wave and maturity relation curve, and the formula for calculating maturity is as follows:
M=∑ (T+15) × △ t
In formula, M is maturity, and T is the mean temperature in the t inner concrete test block of period △, and concrete is impacted bullet
Property wave longitudinal wave velocity typical value and mature angle value be calculated be put into rectangular coordinate system, it is vertical to establish concrete impact elasticity wave
Wave velocity of wave and maturity relation curve.
As a preferred solution: concrete impact elasticity wave longitudinal wave velocity and maturity are closed in the case where marking feeding curing condition for foundation
It is curve in the impact elasticity wave longitudinal wave velocity test that carries out, the value range of each maturity measuring point number is 5~15.
As a preferred solution: the inspection of frost damege degree will be carried out when the concrete curing in concrete works to test age
Survey process are as follows: impacted in concrete surface by exciting device and generate impact elasticity wave, impact elasticity wave longitudinal wave is in concrete test block
Acceleration transducer is reached after interior transmitting, the vibration signal that acceleration transducer will acquire is converted into electric signal, through data processing
The detection of longitudinal wave velocity, the velocity of wave variation of comparison impact elasticity wave longitudinal wave, to complete Nondestructive Evaluation concrete can be completed
It endures cold state.
As a preferred solution: exciting device is tapped on concrete works surface, to generate impact elasticity wave, swash
The value range of the percussion measuring point number of vibrating device is 5~15.
As a preferred solution: it is existing for calculating concrete works corresponding maturity in test age according to the development of temperature
The maturity of field concrete works, in standard curing Under Concrete impact elasticity wave longitudinal wave velocity and maturity relation curve
On find out concrete works maturation angle value, the corresponding impact elasticity wave longitudinal wave velocity of the maturity is to mark to support impact elasticity wave longitudinal wave
Velocity of wave compares mark and supports impact elasticity wave longitudinal wave velocity and real impact elastic wave longitudinal wave velocity, marks and support impact elasticity wave longitudinal wave wave
Difference is bigger between speed and real impact elastic wave longitudinal wave velocity, indicates that the degree of enduring cold of concrete works is higher, marks and supports impact
Difference is smaller between elastic wave longitudinal wave velocity and real impact elastic wave longitudinal wave velocity, indicates that the degree of enduring cold of concrete works is got over
It is low.
As a preferred solution: temperature sensor is equipped with moisture recorder, temperature sensor and moisture recorder phase
Connection.
The present invention has the advantages that compared with the existing technology
1, the present invention is a kind of method for evaluating concrete early freezc performance using impact elasticity wave, to evaluation object
Structure does not cause to damage, it is ensured that the integrality of evaluation object, it is ensured that the subsequent service performance of evaluation object is unaffected.The present invention
Concrete in winter subzero temperature frost damege degree can be quickly detected, science determines striking time and maintenance plan, is to guarantee coagulation
The important technical of native construction quality.
2, operation of the present invention is convenient, and step is simple, for the test method of a large amount of cured under same condition test specimens of precuring,
It is time saving and energy saving.
3, operation of the present invention is flexible and applied widely, measuring point can be arranged in multiple positions in concrete works, with
Test the state of enduring cold of different parts in concrete works.The present disclosure additionally applies for the tests of enduring cold in concrete each stage, especially
It is suitable for early stages.
4, the longitudinal wave velocity and maturity relation curve of the invention by establishing standard curing Under Concrete test block, and
In conjunction with longitudinal wave velocity test method, the early strength of concrete in endure cold degree and the winter construction of early concrete is evaluated,
To carry out accurate for the degree of enduring cold of concrete in winter construction and timely evaluate.
5, the present invention for concrete endure cold icing without damage testing, the present invention is to freeze injury of concrete in winter construction
Preventing and controlling have directive significance.
Detailed description of the invention
Fig. 1 is the velocity of longitudinal wave schematic diagram using Impact echo detection concrete works.
Fig. 2 is that the longitudinal wave velocity comparison that concrete difference is endured cold under state the identical maturity established in conjunction with the embodiments under is closed
System schemes, and arrow direction indicates the direction of motion of longitudinal wave in figure.
Component names involved in above-mentioned figure and label are summarized as follows:
1- concrete works；2- temperature sensor；3- moisture recorder；4- jump bit；5- acceleration transducer；6- longitudinal wave
Path；7- electric wire；8- preamplifier；9- instrument host.
Specific embodiment
In order to make the objectives, technical solutions and advantages of the present invention clearer, below by shown in the accompanying drawings specific
Embodiment describes the present invention.However, it should be understood that these descriptions are merely illustrative, and it is not intended to limit model of the invention
It encloses.In addition, in the following description, descriptions of well-known structures and technologies are omitted, it is of the invention to avoid unnecessarily obscuring
Concept.
Here, it should also be noted that, in order to avoid having obscured the present invention because of unnecessary details, in the accompanying drawings only
Show the structure and/or processing step closely related with the solution of the present invention, and be omitted with relationship of the present invention less its
His details.
Specific embodiment 1: embodiment is described with reference to Fig. 1, comprising:
Determining concrete works 1 to be evaluated, pre-buried temperature sensor 2 carries out temperature data acquisition in concrete works 1,
It determines test age, and is established under the conditions of standard curing according to test age and matched using exciting device and acceleration transducer 5
Close and complete impact elasticity wave longitudinal wave velocity and maturity relation curve, test age is certain period of time, refer specifically to from
Concrete works 1 pour a period of time after molding, are specifically set according to specific needs, and model is arranged in Normal time period
It encloses and is chosen in one month after concrete works 1 conserve, is i.e. concrete early stage age, the coagulation in concrete works 1
Frost damege degree detecting is carried out simultaneously when soil maintenance to test age and maturity calculates, and is obtained by frost damege degree detecting
Practical longitudinal wave velocity is taken, it is corresponding in test age to provide temperature data calculating concrete works 1 according to temperature test instrument
Maturity obtains to mark and supports longitudinal wave velocity by the mature ratio being calculated to concrete longitudinal wave velocity and maturity relation curve,
Compare mark and support longitudinal wave velocity and practical longitudinal wave velocity, evaluates concrete early freezc performance.
It is required to carry out frost damege on the concrete test block that concrete works 1 and mark support condition Imitating in the present invention
Degree detecting, and detection operating process is identical, obtains real impact elastic wave longitudinal wave velocity by frost damege degree detecting, than
Impact elasticity wave longitudinal wave velocity and real impact elastic wave longitudinal wave velocity are supported compared with marking, evaluates concrete early freezc performance.
Since the compression strength of concrete is the monovalent function of curing temperature T Yu firm time t product.For same kind
Concrete, regardless of maturity is obtained by what kind of temperature and time product, as long as its maturity is equal, the intensity of concrete
It is regarded as identical.
Further, the establishment process of concrete longitudinal wave velocity and maturity relation curve are as follows: under the conditions of standard curing,
To and the consistent multiple concrete test blocks of 1 match ratio of concrete works conserve, the standard curing item is kept after demoulding
Longitudinal wave velocity test is carried out under part, obtains the typical value that the concrete longitudinal wave velocity under same age is in concrete works 1,
Maturity is calculated, establishes concrete longitudinal wave velocity and maturity relation curve, the formula for calculating maturity is as follows:
M=∑ (T+15) × △ t
Wherein, M is maturity；T is the mean temperature in the t inner concrete test block of period △, by concrete longitudinal wave velocity
Typical value and mature angle value be calculated be put into rectangular coordinate system, establish concrete longitudinal wave velocity and maturity relationship be bent
Line.
Further, establish concrete longitudinal wave velocity and maturity relation curve and in the longitudinal wave velocity test that carries out,
Measuring point in each test block is at least 5, it is desirable that good with test face contact when acceleration transducer 5 is fixed, acceleration sensing
Distance is not more than 0.1m between device 5 and jump bit 4.
Further, the size of each test block is 150mm × 150mm × 150mm.
Further, frost damege degree detecting process is carried out when concrete curing to test age are as follows: in concrete table
Face is impacted by exciting device generates impact elasticity wave, and impact elasticity wave longitudinal wave reaches acceleration after transmitting in concrete test block and passes
Sensor 5, acceleration transducer 5 obtain vibration signal and are converted to electric signal, can get longitudinal wave velocity through data processing, to specific impulse
The velocity of wave variation for hitting elastic wave longitudinal wave, to complete the state of enduring cold of Nondestructive Evaluation concrete.
Further, in practical concrete works, jump bit is tapped on concrete surface, to generate impact
The value range of elastic wave, the percussion measuring point number of jump bit 4 is 5~15.It is more using concrete under the conditions of standard curing
Function nondestructive testing instrument test perpendicular to the longitudinal wave velocity of side surface direction to the non-forming side of concrete test block, by single mixed
It when solidifying soil test block detection, is evenly arranged on concrete test block according to Impact echo and surveys area, each concrete test block surveys area's number
Amount no less than 10, if concrete test block is smaller, surveying area can suitably be reduced, and the minimum value of measuring point number is 5.
The process that exciting device is matched with acceleration transducer 5 is the prior art, and exciting device includes jump bit 4 and instrument
Device host 9.Other existing exciting devices that can be realized hammer action and wide area vibration signal pick device are also replaceable.May be used also
Select concrete multifunction nondestructive testing instrument.
The course of work between exciting device and acceleration transducer 5 also relates to the cooperation of preamplifier 8, San Zhexiang
The process of cooperation is same as the prior art.
Further, using the implementation process of the detection mode detection longitudinal wave velocity of Impact echo are as follows: take one more to put down
Whole surface determines the detection surface of concrete works 1 to be evaluated, selectes and existing instrument, Impact echo detection mode phase
Acceleration transducer 5, preamplifier 8 and the jump bit 4 matched, by the input terminal of acceleration transducer 5 and preamplifier 8
It is connected, preamplifier 8 turns on the switch and select suitably to amplify gear, the output end and instrument host 9 of preamplifier 8
Channel be connected, start instrument host 9 after, the thickness of concrete works 1 to be evaluated, the correlation of strength grade of concrete are set
After parameter, the detection surface of concrete works 1 to be evaluated is hammered with jump bit 4, acceleration transducer 5 acquires data and is transferred to instrument
Device host 9, the data for saving acquisition carry out data parsing again and the detection of longitudinal wave velocity can be completed.It is acceleration transducer 5, preposition
It is connected between amplifier 8 and instrument host 9 by electric wire 7.
It is that the reception vibration signal of acceleration transducer 5 is converted into charge letter that electric signal, which is become this process of longitudinal wave velocity,
Number, after being then input to preamplifier 8, Electric signal processing at digital signal, is then input to instrument master by preamplifier 8
It is handled in machine 9 using computer program, computer program eventually forms vertical by series of steps such as waveform frequency spectrum analyses
Wave velocity of wave.
Further, calculating the corresponding maturity within the age of concrete works 1 according to the development of temperature is that scene is mixed
The maturity of solidifying geotechnique's journey 1, found out on concrete longitudinal wave velocity and maturity relation curve with concrete longitudinal wave velocity at
The identical maturity of ripe degree relation curve, the corresponding longitudinal wave velocity of the maturity are to mark to support longitudinal wave velocity, compare mark and support longitudinal wave wave
Speed and practical longitudinal wave velocity, difference is bigger between the feeding longitudinal wave velocity of mark and practical longitudinal wave velocity, indicates enduring cold for concrete works 1
Degree is higher, and difference is smaller between the feeding longitudinal wave velocity of mark and practical longitudinal wave velocity, indicates that the degree of enduring cold of concrete works 1 is got over
It is low.
Further, temperature sensor 2 is equipped with moisture recorder 3, temperature sensor 2 and 3 phase of moisture recorder
Connection.Temperature sensor 2 and moisture recorder 3 are existing product, the mutually matched course of work of the two and prior art phase
Together.
Further, the position that obtains of measuring point is only on the surface of the concrete works 1 of practice of construction in concrete works 1
Upper acquisition, the setting position multiplicity of measuring point on concrete test block, on the upper surface of concrete test block, lower end surface or surrounding side
It determines and obtains.
Specific embodiment 2: embodiment is described with reference to Fig. 1, present embodiment includes following four step:
Step 1: firstly, the concrete works 1 of winter construction or cold district, the pre-buried temperature in concrete construction
Sensor 2, and moisture recorder 3 is connected, concrete internal temperature is recorded in real time, determines test age.
Step 2: secondly under the conditions of standard curing, the concrete of identical match ratio establishes concrete according to test age
Longitudinal wave velocity and maturity relation curve.
Step 3: selecting test zone in concrete works 1, when maintenance needs to carry out detection concrete to test age
When frost damege degree, can first it be tested with the longitudinal wave velocity that concrete multifunction nondestructive testing instrument carries out on concrete surface,
Longitudinal wave velocity of the on-site concrete engineering 1 under test age is obtained, and is matched according to temperature sensor 2 and moisture recorder 3
The development for closing obtained temperature calculates the age corresponding maturity.
Step 4: comparative analysis concrete is in identical maturity, under the conditions of standard curing and the longitudinal wave wave of construction site
Speed, the characterization value with the ratio between longitudinal wave velocity under two kinds of curing conditions, as concrete early freezc.
In step 2, establishing concrete longitudinal wave velocity, detailed process is as follows with maturity relation curve:
At 20 DEG C ± 2 DEG C of temperature, humidity is not less than in the environment of 95%, chooses three test blocks and is conserved, concrete examination
Block is the concrete test block as the match ratio of the concrete of on-site concrete engineering 1, by concrete test block maintenance to test
It is demoulded after age, is conserved at the standard conditions after demoulding, while carrying out longitudinal wave velocity test.Longitudinal wave velocity test
Test process is same as the prior art.
Specific embodiment 3: present embodiment is that specific embodiment one or two further limit, marks and support lower mix
Solidifying soil test block is when carrying out longitudinal wave velocity test, and after molding the 1st day, every 6h carries out a longitudinal wave velocity test.The 2nd after molding
It and the 3rd day, every 12h carry out a longitudinal wave velocity test.The 4th day to the 28th day after molding, per longitudinal wave velocity of progress for 24 hours
Test.
Specific embodiment 4: present embodiment is further limiting for specific embodiment one, two or three, standard curing
Under the conditions of, longitudinal wave velocity test is carried out to concrete using concrete multifunction nondestructive testing instrument, measured value is accurate to
0.001km/s.When providing that age carries out longitudinal wave velocity test, select in four non-forming sides of each test specimen one the most
Smooth side carries out longitudinal wave velocity test.5 points are selected to measure respectively in the side of each age each test specimen.I.e. each age
The measurement point of phase longitudinal wave velocity is each test specimen 5, and three test specimens amount to 15 points.
Specific embodiment 5: present embodiment is further limiting for specific embodiment one, two, three or four, standard
Under curing condition, it is contemplated that there are large errors to measure each test specimen when handling data for partial data during test
Maximum point and smallest point in 5 data are rejected, and the average value for calculating remaining longitudinal wave velocity is represented as the test specimen longitudinal wave velocity
Value.The longitudinal wave velocity typical value of three test specimens is averaged, the typical value as concrete longitudinal wave velocity under the age.
Specific embodiment 6: present embodiment is further limiting for specific embodiment one, two, three, four or five, build
Longitudinal wave velocity-maturity calibration curve of vertical standard curing member.Maturity calculation method is as follows:
M=∑ (T+15) × △ t
Wherein, M is maturity, and unit: DEG C h, T are in period Δ t inner concrete mean temperature.
Specific embodiment 7: present embodiment is that specific embodiment one or two further limit, in construction
The pre-buried of temperature sensor 2 is carried out to on-site concrete engineering 1.Temperature sensor 2 pre-buried one, temperature sensor 2 with
Moisture recorder 3 is connected, and records the temperature development of concrete in real time.When the different position of concrete works 1 is likely to be in
It, then should be in the embedding temperature sensor 2 in these positions when at a temperature of different.
Specific embodiment 8: present embodiment is further limiting for specific embodiment one, two or seven, live coagulation
The longitudinal wave velocity test of geotechnological journey 1 mixing under the conditions of concrete surface progress, test method and data processing method and mark are supported
The method for coagulating soil is identical.Likewise, for the contingency for preventing measurement result, when testing on-site concrete engineering 1, each
The measuring point of age 5~15.After rejecting concrete longitudinal wave velocity maximum value and minimum value, it is averaged as coagulation under the age
The longitudinal wave velocity V of soilP1, unit km/s.
Specific embodiment 9: present embodiment is further limiting for specific embodiment one, two, seven or eight, when right
After on-site concrete engineering 1 carries out longitudinal wave velocity test, on-site concrete engineering 1 is calculated according to temperature measurement data and formula and is being tested
The maturity of concrete when age.
Specific embodiment 10: present embodiment is that specific embodiment one or two further limit, coagulation is supported marking
On native longitudinal wave velocity-maturity calibration curve, the longitudinal wave wave with on-site concrete engineering 1 in the identical maturity of test age is found
Speed is denoted as VP0, unit km/s, comparison VP0And VP1Value, note,α is bigger, represents shadow of the formation to velocity of wave of ice
Sound is bigger, then concrete frost damege is more serious.
The present invention can according to on-site concrete under the conditions of identical maturity and mark curing concrete longitudinal wave velocity ratio come
Determine the degree of enduring cold of concrete.
Specific embodiment 11: present embodiment is further limiting for specific embodiment one, is existed using this method
When evaluating concrete early freezc performance, for different concrete works 1, the detection mode for obtaining velocity of longitudinal wave, which has, impacts back
Wave method, single side Law of Communication, two-sided penetrant method and surface wave method, shape ruler of the different detection modes for concrete works 1
Very little requirement is different, Impact echo be suitable for that area is big, thickness is small and wall thickness known to structure, single side Law of Communication is suitable for wall thickness
Relatively thin and small surface area structure, two-sided penetrant method requires two-sided operation and test interplanar distance is no less than 0.5 meter, surface wave method
Phase is selected for the geomery of different concrete works 1 in 0.5 meter or more and the big structure of surface area suitable for thickness
The operating process of corresponding detection mode, specific detection technique is same as the prior art.Specific inspection is chosen as the case may be
Survey method.
Illustrate following embodiment in conjunction with beneficial effects of the present invention:
Embodiment one: the detection mode used when this method detects in the present embodiment is Impact echo, the detection side
Formula is built upon on the basis of the propagation and reflection of longitudinal wave, is played a significant role in terms of early strength of concrete test, signal
Figure as shown in Fig. 1, for C40 concrete, has carried out 19 hours concrete test block in age to be measured under the conditions of mark is supported
Maintenance is carried out the test of longitudinal wave velocity using the concrete multifunction nondestructive testing instrument of model SCE-MATS-S, is denoted as VP0, single
Position is km/s, obtains C40 concrete longitudinal wave velocity-maturity relationship under the conditions of bid is supported.On-site concrete engineering 1 is marking the condition of supporting
It is placed in -15 DEG C of subzero temperature environment after lower maintenance 19h and conserves 20h, test its longitudinal wave velocity VP1, unit km/s obtains identical
C40 concrete longitudinal wave velocity-maturity relationship under maturity.Label 6 is longitudinal wave path in figure, it is shown that the transmitting position of longitudinal wave
It sets, the arrow on longitudinal wave path shows the direction of transfer of longitudinal wave.
By calculating and testing it is known that VP0Longitudinal wave when representing concrete maturity is 665 DEG C of h under the conditions of mark is supported
Speed is 2.215km/s, VP1Represent concrete in the case where identical maturity is endured cold as 665 DEG C of h velocity of longitudinal wave as
3.327km/sThe effect that i.e. ice provides makes inside concrete denser, the longitudinal wave speed of impact elasticity wave
Degree becomes larger after icing, and the concrete works 1 ice condition of enduring cold is more serious.
Claims (7)
1. a kind of method using impact elasticity wave evaluation concrete early freezc performance, it is characterised in that: include:
Standard curing Under Concrete impact elasticity wave longitudinal wave velocity and maturity relation curve are established, determines coagulation to be evaluated
Geotechnological journey, pre-buried temperature sensor carries out temperature data acquisition in concrete works, when the concrete in concrete works is supported
Frost damege degree detecting is carried out simultaneously when shield to test age and maturity calculates, and is obtained by frost damege degree detecting real
It is corresponding in test age to provide temperature data calculating concrete works according to temperature measuring device for border impact elasticity wave longitudinal wave velocity
Maturity obtained by the mature ratio being calculated to concrete impact elasticity wave longitudinal wave velocity and maturity relation curve
Corresponding mark of the maturation angle value supports impact elasticity wave longitudinal wave velocity, compares mark and supports impact elasticity wave longitudinal wave velocity and real impact bullet
Property wave longitudinal wave velocity, evaluate concrete early freezc performance.
2. a kind of method using impact elasticity wave evaluation concrete early freezc performance according to claim 1, special
Sign is: the establishment process of concrete impact elasticity wave longitudinal wave velocity and maturity relation curve are as follows: under the conditions of standard curing,
To and the consistent multiple concrete test blocks of concrete works match ratio conserve, when reaching test age, in standard curing
Under the conditions of carry out the test of impact elasticity wave longitudinal wave velocity, multiple measuring points are determined on each concrete test block, obtain different maintenances
The typical value of concrete impact elasticity wave longitudinal wave velocity under age calculates maturity according to temperature and age, establishes concrete
Impact elasticity wave and maturity relation curve, the formula for calculating maturity are as follows:
M=∑ (T+15) × △ t
In formula, M is maturity, and T is the mean temperature in the t inner concrete test block of period △, by concrete impact elasticity wave
It the typical value of longitudinal wave velocity and mature angle value is calculated is put into rectangular coordinate system, establish concrete impact elasticity wave longitudinal wave wave
Speed and maturity relation curve.
3. a kind of method using impact elasticity wave evaluation concrete early freezc performance according to claim 2, special
Sign is: establish mark support curing condition under concrete impact elasticity wave longitudinal wave velocity and maturity relation curve and carry out
In the test of impact elasticity wave longitudinal wave velocity, the value range of each maturity measuring point number is 5~15.
4. a kind of method using impact elasticity wave evaluation concrete early freezc performance according to claim 3, special
Sign is: frost damege degree detecting process will be carried out when the concrete curing in concrete works to test age are as follows: mixed
It coagulates soil surface and generation impact elasticity wave is impacted by exciting device, impact elasticity wave longitudinal wave reaches after transmitting in concrete test block to be added
Velocity sensor, the vibration signal that acceleration transducer will acquire are converted into electric signal, and longitudinal wave wave can be completed through data processing
The detection of speed, the velocity of wave variation of comparison impact elasticity wave longitudinal wave, to complete the state of enduring cold of Nondestructive Evaluation concrete.
5. a kind of method using impact elasticity wave evaluation concrete early freezc performance according to claim 4, special
Sign is: exciting device is tapped on concrete works surface, to generate impact elasticity wave, the percussion of exciting device is surveyed
The value range of point number is 5~15.
6. a kind of utilization impact elasticity wave according to any one of claim 1 to 5 evaluates concrete early freezc performance
Method, it is characterised in that: according to the development of temperature calculate concrete works in test age corresponding maturity be scene
The maturity of concrete works, on standard curing Under Concrete impact elasticity wave longitudinal wave velocity and maturity relation curve
Concrete works maturation angle value is found out, the corresponding impact elasticity wave longitudinal wave velocity of the maturity is to mark to support impact elasticity wave longitudinal wave wave
Speed compares mark and supports impact elasticity wave longitudinal wave velocity and real impact elastic wave longitudinal wave velocity, marks and support impact elasticity wave longitudinal wave velocity
Difference is bigger between real impact elastic wave longitudinal wave velocity, indicates that the degree of enduring cold of concrete works is higher, marks and supports impact bullet
Difference is smaller between property wave longitudinal wave velocity and real impact elastic wave longitudinal wave velocity, indicates that the degree of enduring cold of concrete works is got over
It is low.
7. a kind of method using impact elasticity wave evaluation concrete early freezc performance according to claim 1, special
Sign is: temperature sensor is equipped with moisture recorder, and temperature sensor is connected with moisture recorder.
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| CN112077997A (en) * | 2020-07-31 | 2020-12-15 | 中国能源建设集团安徽电力建设第二工程有限公司 | Concrete form removal strength monitoring method |
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