CN107941268B - The method of concrete sample temperature and humidity is measured under a kind of constant shaft press loading effect - Google Patents
The method of concrete sample temperature and humidity is measured under a kind of constant shaft press loading effect Download PDFInfo
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- CN107941268B CN107941268B CN201711053941.1A CN201711053941A CN107941268B CN 107941268 B CN107941268 B CN 107941268B CN 201711053941 A CN201711053941 A CN 201711053941A CN 107941268 B CN107941268 B CN 107941268B
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- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
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Abstract
The invention discloses a kind of methods that concrete sample temperature and humidity is measured under constant shaft press loading effect, the method that the present invention measures concrete sample temperature and humidity is measured under constant shaft press loading effect, the measurement method step is clear, principle is simple, measurement process is easy to operate, show that shaft pressuring load can generate the relative humidity of concrete according to this measurement method and significantly affects, the moment that load applies, relative humidity has the raising of moment, starts slowly to decline later.
Description
Technical field
The present invention relates to concrete temperature and humidity measurement technical fields, and in particular to measures under a kind of constant shaft press loading effect
The method of concrete sample temperature and humidity.
Background technique
Concrete structure is pouring early stage since tensile strength is low, and temperature and humidity variation is obvious, and contraction distortion is larger, often goes out
Existing serious early age crack problem.The temperature and humidity of inside concrete is the important indicator of prediction early-age crack situation, therefore quasi-
True measurement obtains the temperature and humidity of early age, can provide secure support for early stage temperature and humidity transmission theory and Study on Crack Resistance.Base
In this, domestic and international a large number of researchers have carried out experimental study to concrete early stage temperature and humidity, are popped one's head in and are embedded to using all kinds of temperature and humidity
The development and change of concrete early age and maturity period temperature and humidity are measured in concrete sample.But most Humidity Test is ground
Study carefully and carries out under no external loads state.According to pertinent literature it is found that the application of load can be to the biography of concrete temperature and humidity
It is defeated to affect, and the concrete structure overwhelming majority in Practical Project can be by the constraint of load and surrounding structure
Effect.Therefore temperature and humidity measured under no-load stress condition can not accurately reflect actual conditions.Based on this, consider
Temperature and humidity measurement under the influence of mechanical state receives more and more attention.
It is considerably less about the temperature and humidity measurement test under loading status at present, and load dress is closed without specific warm and humid couple of force
It sets.
Summary of the invention
The object of the present invention is to provide a kind of easy experimental provisions, utilize the material simple and easy to get such as steel plate, screw rod, bolt
Material is fabricated to loading frame, applies axial compressive force to the concrete sample of embedment temperature and humidity probe, and by deformeter to load water
It is flat to be monitored, the temperature and humidity of concrete sample under constant shaft press loading effect is measured with this.
The invention is realized by the following technical scheme:
A kind of method that concrete sample temperature and humidity is measured under constant shaft press loading effect, includes the following steps:
(1) according to the size of concrete sample and design pressure, the payload values that jack applies are determined, this is default load
Value, that is, numerical value shown by load transducer at the end of loading calculate spiral shell according to the elasticity modulus for presetting payload values and screw rod
The strain of bar, this is the preset value of strain acquirement instrument；
(2) casting concrete test specimen, remains for installing in advance the hole of temperature and humidity probe when vibrating with pvc pipe, and concrete is whole
Insertion temperature and humidity probe, is put into curing box or fog room and conserves to load age after solidifying；
(3) nut below pressurization bottom plate on screw rod is tightened, concrete is tried in position of the fixed pressurization bottom plate on screw rod
Part takes out from curing box, is placed on pressurization bottom plate according to compression aspect, and temperature and humidity probe is connected to data of the Temperature and Humidity module and is adopted
Header adjusts the position of pressurization backing plate, it is made to be pressed on the upper end of concrete sample to be measured；
(4) jack and load transducer are installed on pressurization backing plate top, adjusts position of the counter-force support plate on screw rod
It sets, it is made to be pressed on the upper end of jack, tighten the nut on the screw rod of counter-force support plate or more two sides, fixed counter-force support plate exists
Position on screw rod；
(5) screw rod between pressurization bottom plate and the backing plate that pressurizes is polished, foil gauge is pasted at polishing, by foil gauge
It is connected to strain acquisition system；
(6) it is loaded with jack, loading procedure is controlled according to the payload values of load transducer, when load transducer
When payload values reach default payload values, the nut above pressurization backing plate on screw rod is tightened, is applied to by pressurization backing plate maintenance mixed
The shaft pressuring load of solidifying soil test specimen, loosens jack；
(7) whether the strain observed on screw rod reaches preset value, if do not reached, return step (6), until reaching
Preset value simultaneously remains stable；
(8) jack and load transducer are dismantled, pressurization bottom plate and pressurization backing plate and concrete sample are placed on maintenance
It is conserved in case and fog room, the data that data of the Temperature and Humidity module vasculum continues to monitor concrete sample medium temperature moisture probe become
Change, and obtains the curve graph that concrete sample temperature and humidity changes with age.
The device packet of concrete sample temperature and humidity is measured under the constant shaft press loading effect used in the above method of the present invention
Include: the identical stainless steel plate of three block sizes, shape, material, at least also cross four screw rods on every piece of stainless steel plate, three pieces are not
The steel plate that becomes rusty is respectively pressurize bottom plate, pressurization backing plate and counter-force support plate；The setting concrete between bottom plate and pressurization backing plate that pressurizes tries
Part, is provided with multiple temperature and humidity probes along screw rod short transverse in the concrete sample, and each temperature and humidity probe is electrically connected to
Data of the Temperature and Humidity module vasculum, pressurize bottom plate and pressurize backing plate between screw rod on be provided with foil gauge, foil gauge, which is electrically connected to, answers
Become Acquisition Instrument；From lower and set gradually load transducer and jack, counter-force support plate between pressurization backing plate and counter-force support plate
It is fixed on screw rod by nut.
Preferably, screw rod is high-strength bolt, and the length of screw rod is 1m, and nut is high-strength nut matched with screw rod.
Further, the square plate that bottom plate, pressurization backing plate and the counter-force support plate of pressurizeing are thickness 20mm is straight at four
The through-hole for passing through screw rod is opened up at angle, aperture is 18 to 22mm.
As a preferred embodiment, the model LTR-1 of load transducer, temperature and humidity probe are that resistance-type temperature and humidity number passes
Sensor, model HC2-S3, data of the Temperature and Humidity module vasculum are H series temperature and humidity dew point transducer controller, foil gauge model
BF1K-3AA, strain acquirement instrument model YJW-8/16.
Further, the operating temperature of data of the Temperature and Humidity module vasculum is -40 ~ 100 DEG C, humidity is 0 ~ 100%RH；Temperature
Temperature accuracy when being 23 DEG C is ± 0.1 DEG C, humidity precision is ± 0.8%RH.
Compared with prior art, the present invention has following technical effect that
The method that the present invention measures concrete sample temperature and humidity is measured under constant shaft press loading effect, described
Measurement method step is clear, and principle is simple, and measurement process is easy to operate, show that shaft pressuring load can be to concrete according to this measurement method
Relative humidity generation significantly affect, the moment that load applies, relative humidity has the raising of moment, under starting later slowly
Drop.
Detailed description of the invention
Fig. 1 is the structural schematic diagram that the device of concrete sample temperature and humidity is measured under constant shaft press loading effect.
In figure, 1, load bottom plate, 2, pressurization backing plate, 3, counter-force support plate, 4, high-strength bolt, 5, nut, 6, jack, 7,
Load transducer, 8, temperature and humidity probe, 9, data of the Temperature and Humidity module vasculum, 10, foil gauge, 11, strain acquirement instrument.
Fig. 2 is the structural schematic diagram for loading bottom plate.
Fig. 3 is concrete sample 28d temperature and humidity curve graph measured by example 1.
Specific embodiment
For the understanding convenient for those skilled in the art, below with reference to embodiment, the present invention is further illustrated.
As shown in Figure 1, measuring the device of concrete sample temperature and humidity under a kind of constant shaft press loading effect, comprising: be used for
Place the loading frame of concrete sample and loading equipemtn；Temperature and humidity for acquiring the temperature and humidity change curve of concrete sample is adopted
Collecting system；Screw rod for monitoring pressure area strains, and reflection load maintains the strain acquisition system of situation.
Loading frame includes pressurization bottom plate 1, pressurization backing plate 2, counter-force support plate 3, screw rod 4 and nut 5, pressurization bottom plate 1, pressurization
Backing plate 2 and counter-force support plate 3 are supported by screw rod 4, and fixed by the matching nut of corresponding position 5.
Concrete sample to be measured is placed between the pressurization bottom plate 1 of the loading frame and pressurization backing plate 2, which is pressurization
Area；Jack 6 and load transducer 7 be installed between backing plate and the counter-force support plate of pressurizeing, when load 6 generated reaction force of jack by
Counter-force support plate 3 is born.
As shown in Fig. 2, pressurization bottom plate 1, pressurization backing plate 2, counter-force support plate 3 are three identical stainless steel plates, size, shape
Shape is all the same, and thickness is the rectangle stainless steel plate of 20mm, in four right angle apertures, aperture 18 to 22mm, for across
Screw rod.Screw rod 4 is high-strength bolt, and length 1m, nut 5 is mating high-strength nut, and quantity is 8；In the middle part of the screw rod of pressor areas
One section of selection height 3cm or so carries out polishing processing, size about 2cmx3cm, for pasting foil gauge.
This device can carry out the temperature and humidity measurement under Arbitrary Load effect to length 400mm concrete sample below,
As needed, the improvement in terms of can also carrying out size to the component on device adapts to the test specimen measurement of smaller or larger size.
Jack 6 and load transducer 7, load transducer model LTR-1 type is for providing axial compressive force and showing power
Size.
Humiture acquisition system, including temperature and humidity probe 8 and data of the Temperature and Humidity module vasculum 9, temperature and humidity probe using
Resistance-type temperature and humidity digital sensor, model HC2-S3, vasculum are H series temperature and humidity dew point transducer controller.This is warm and humid
Spend the working range of instrument: temperature is -40 ~ 100 DEG C, humidity is 0 ~ 100%RH.Temperature accuracy ± 0.1 DEG C is (when temperature is 23 DEG C
Precision), humidity precision ± 0.8%RH.Temperature and humidity probe is passed through inside pvc pipe Transducers Embedded in Concrete test specimen with holes, warm and humid degree
Primary according to every 1h record, data are collected by transmitter.
Strain acquisition system, including foil gauge 10 and strain acquirement instrument 11, foil gauge are BF1K-3AA strain gauge high-precision
Resistance strain plate, strain acquirement instrument model YJW-8/16 type digital still resistance strain gauge,.
For the method for measuring concrete sample temperature and humidity under a kind of constant shaft press loading effect of the present invention, one is provided
A embodiment, specific steps are as follows:
(1) the 28d temperature and humidity measurement under shaft pressuring load is carried out to the C50 concrete sample having a size of 150x150x300mm
Experiment.Concrete sample surrounding and bottom edge are sealed by plastic film, and upper surface is contacted with air.Load time is 3d age,
Design concrete pressure is 5Mpa, is the 20% of concrete sample 3d age compression strength, being scaled jack load is
112.5kN.According to the stress-strain relation of high-strength bolt, obtaining screw rod strain under 5Mpa stress is 1800 μ ε, this is to answer
Become the preset value of instrument.
(2) along the embedding 3 temperature and humidity probe of short transverse after concreting, probe measurement position is respectively the bottom of away from
Face 20mm, 80mm and 130mm, concrete sample are put into curing box or fog room and conserve to 3d age；
(3) when 3d age, concrete sample is placed on load bottom plate 1 according to compression aspect, temperature and humidity is popped one's head in and is connected
It is connected to data of the Temperature and Humidity module vasculum, the nut on pressurization bottom plate 1 is tightened, fixes its position, adjust pressure pad Board position, make its pressure
Firmly concrete sample to be measured；
(4) jack 6 and load transducer 7 are installed on pressurization 2 top of backing plate, 3 position of counter-force support plate is adjusted, by it
Jack 6 is withstood, nut, fixed 3 position of counter-force support plate are tightened；
(5) foil gauge 10 is pasted at pressurization district screw rod polishing, foil gauge connects strain acquisition system 11；
(6) it is loaded with jack 6, loading procedure is controlled according to load transducer 7.Reach default load 112.5kN
When, pressurization 2 upper nut of backing plate is tightened, concrete shaft pressuring load is maintained, loosens jack 6；
(7) whether the strain of observation screw rod reaches 1800 μ ε of preset value, if do not reached, return step (6), until reaching
To preset value and remain stable；
(8) jack 6 and load transducer 7 are dismantled, loading frame and concrete sample are placed on curing box and fog room
It is inside conserved, humiture observation system continues to monitor 28d；
Experimental result:
Obtained data of the Temperature and Humidity module result is tested as shown in figure 3, as seen from the figure, in the preceding 2d age that concrete has just poured,
Relative humidity is higher, 100% or so.Due to hydration, temperature rises rapidly again decline rapidly.Relative humidity after 2d age
It begins to decline.Loading frame is begun to use to be loaded when 3d, it can be found that relative humidity has apparent the becoming of declining again of rising
Gesture, ascensional range are about 1% relative humidity, and relative humidity slowly declines later.Found out by figure and is loaded using loading frame, it is right
Temperature is then without generating apparent influence.
According to the experimental results, shaft pressuring load can generate the relative humidity of concrete and significantly affect, the wink that load applies
Between, relative humidity has the raising of moment, starts slowly to decline later.But load has little effect concrete temperature.
Claims (8)
1. measuring the method for concrete sample temperature and humidity under a kind of constant shaft press loading effect, which is characterized in that including walking as follows
It is rapid:
(1) according to the size of concrete sample and design pressure, the payload values that jack applies are determined, this is default payload values,
Numerical value shown by load transducer at the end of loading calculates screw rod according to the elasticity modulus for presetting payload values and screw rod
Strain, this is the preset value of strain acquirement instrument；
(2) casting concrete test specimen remains for installing in advance the hole of temperature and humidity probe, after concrete final set when vibrating with pvc pipe
It is inserted into temperature and humidity probe, is put into curing box or fog room and conserves to load age；
(3) tighten the nut below pressurization bottom plate on screw rod, position of the fixed pressurization bottom plate on screw rod, by concrete sample from
It takes out in curing box, is placed on pressurization bottom plate according to compression aspect, temperature and humidity probe is connected to data of the Temperature and Humidity module vasculum,
The position for adjusting pressurization backing plate, makes it be pressed on the upper end of concrete sample to be measured；
(4) jack and load transducer are installed on pressurization backing plate top, adjusts position of the counter-force support plate on screw rod, makes
The nut on the screw rod of counter-force support plate or more two sides is tightened in its upper end for being pressed on jack, and fixed counter-force support plate is in screw rod
On position；
(5) screw rod between pressurization bottom plate and the backing plate that pressurizes is polished, foil gauge is pasted at polishing, foil gauge is connected
To strain acquirement instrument；
(6) it is loaded with jack, loading procedure is controlled according to the payload values of load transducer, when the load of load transducer
When value reaches default payload values, the nut above pressurization backing plate on screw rod is tightened, concrete is applied to by pressurization backing plate maintenance
The shaft pressuring load of test specimen, loosens jack；
(7) whether the strain observed on screw rod reaches preset value, if do not reached, return step (6), until reaching default
It is worth and remains stable；
(8) jack and load transducer are dismantled, will pressurization bottom plate and pressurization backing plate and concrete sample be placed on curing box or
It being conserved in fog room, data of the Temperature and Humidity module vasculum continues to monitor the data variation of concrete sample medium temperature moisture probe, and
Obtain the curve graph that concrete sample temperature and humidity changes with age.
2. the method for measuring concrete sample temperature and humidity under constant shaft press loading effect as described in claim 1, feature exist
In the every 1h of data of the Temperature and Humidity module vasculum records a data of the Temperature and Humidity module.
3. the method for measuring concrete sample temperature and humidity under constant shaft press loading effect as described in claim 1, feature exist
In the measurement method is carried out on the device for measure under constant shaft press loading effect concrete sample temperature and humidity, the dress
Setting includes: three block sizes, shape, the identical stainless steel plate of material, at least also cross four screw rods on every piece of stainless steel plate, three
Block stainless steel plate is respectively pressurize bottom plate, pressurization backing plate and counter-force support plate；Coagulation is set between pressurization bottom plate and pressurization backing plate
Native test specimen, is provided with multiple temperature and humidity probes along screw rod short transverse in the concrete sample, and each temperature and humidity probe is electrically connected
It is connected to data of the Temperature and Humidity module vasculum, foil gauge, foil gauge electrical connection are provided on the screw rod between bottom plate and the backing plate that pressurizes that pressurizes
To strain acquirement instrument；Load transducer and jack, counter-force are set gradually from bottom to top between pressurization backing plate and counter-force support plate
Support plate is fixed on screw rod by nut.
4. the method for measuring concrete sample temperature and humidity under constant shaft press loading effect as claimed in claim 3, feature exist
In screw rod is high-strength bolt.
5. the method for measuring concrete sample temperature and humidity under constant shaft press loading effect as claimed in claim 3, feature exist
In the square plate that pressurization bottom plate, pressurization backing plate and counter-force support plate are thickness 20mm is opened up in four right angles for wearing
The through-hole of screw rod is crossed, aperture is 18 to 22mm.
6. the method for measuring concrete sample temperature and humidity under constant shaft press loading effect as claimed in claim 4, feature exist
In the length of screw rod is 1m, and nut is high-strength nut matched with screw rod.
7. the method as measured concrete sample temperature and humidity under the described in any item constant shaft press loading effects of claim 4 or 5,
It is characterized in that, the model LTR-1 of load transducer, temperature and humidity probe is resistance-type temperature and humidity digital sensor, model
HC2-S3, data of the Temperature and Humidity module vasculum are H series temperature and humidity dew point transducer controller, foil gauge model BF1K-3AA, strain
Acquisition Instrument model YJW-8/16.
8. the method for measuring concrete sample temperature and humidity under constant shaft press loading effect as claimed in claim 7, feature exist
In the operating temperature of data of the Temperature and Humidity module vasculum is -40~100 DEG C, humidity is 0~100%RH；Temperature when temperature is 23 DEG C
Precision is ± 0.1 DEG C, humidity precision is ± 0.8%RH.
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| CN109211678A (en) * | 2018-10-29 | 2019-01-15 | 安徽理工大学 | A kind of assembled Axially compressed slender column testing machine |
| CN109556968A (en) * | 2018-10-30 | 2019-04-02 | 南昌大学 | A kind of concrete is held to carry and be set and its test method |
| CN110411853A (en) * | 2019-08-28 | 2019-11-05 | 吉林大学 | A kind of concrete sample testing equipment |
| CN115615820B (en) * | 2022-08-11 | 2023-05-16 | 河海大学 | Construction method of early-age concrete relative humidity-tensile stress coupling model |
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| JPH0348745A (en) * | 1989-07-18 | 1991-03-01 | Shimizu Corp | Multipurpose testing device for concrete |
| US5365793A (en) * | 1993-03-01 | 1994-11-22 | State Of Oregon Acting By And Through Oregon State University | Equipment and method for environmental testing of bituminous specimens |
| JP2003065918A (en) * | 2001-08-30 | 2003-03-05 | Shimadzu Corp | Material-testing machine |
| CN201034921Y (en) * | 2007-04-27 | 2008-03-12 | 同济大学 | Concrete in compression slowly changing experiment tester |
| JP2008275518A (en) * | 2007-05-01 | 2008-11-13 | Toa Harbor Works Co Ltd | Degradation inspecting method for concrete structure |
| JP5660789B2 (en) * | 2010-03-04 | 2015-01-28 | 株式会社島津製作所 | Compression testing machine |
| JP2013011575A (en) * | 2011-06-29 | 2013-01-17 | Marui:Kk | Portable concrete compression testing machine |
| CN106918489A (en) * | 2017-05-08 | 2017-07-04 | 温州大学 | A kind of high-strength concrete pressure forming apparatus and its application method |
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Application publication date: 20180420 Assignee: Water conservancy and Hydropower Construction Group Co.,Ltd. of China Construction Sixth Engineering Bureau Assignor: HOHAI University Contract record no.: X2022320000024 Denomination of invention: A method for measuring temperature and humidity of concrete specimen under constant axial compression load Granted publication date: 20190517 License type: Common License Record date: 20220221 |