CN101865865B - Noncontact-type test method of early-period thermal expansion coefficient of concrete dam and equipment thereof - Google Patents
Noncontact-type test method of early-period thermal expansion coefficient of concrete dam and equipment thereof Download PDFInfo
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- CN101865865B CN101865865B CN2010102000120A CN201010200012A CN101865865B CN 101865865 B CN101865865 B CN 101865865B CN 2010102000120 A CN2010102000120 A CN 2010102000120A CN 201010200012 A CN201010200012 A CN 201010200012A CN 101865865 B CN101865865 B CN 101865865B
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- 239000004567 concrete Substances 0.000 title claims abstract description 63
- 238000010998 test method Methods 0.000 title abstract description 8
- 238000012360 testing method Methods 0.000 claims abstract description 95
- 238000006073 displacement reaction Methods 0.000 claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 27
- 238000012423 maintenance Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 12
- 239000005028 tinplate Substances 0.000 claims description 10
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 5
- 230000006641 stabilisation Effects 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- 238000012856 packing Methods 0.000 claims description 4
- 238000013100 final test Methods 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000007547 defect Effects 0.000 abstract 1
- 238000011065 in-situ storage Methods 0.000 abstract 1
- 230000000087 stabilizing effect Effects 0.000 abstract 1
- 208000034189 Sclerosis Diseases 0.000 description 6
- 238000009434 installation Methods 0.000 description 4
- 230000033228 biological regulation Effects 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000003556 assay Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012913 prioritisation Methods 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
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Abstract
The invention relates to a noncontact-type test method of an early-period thermal expansion coefficient of a concrete dam and equipment thereof. The test method comprises the following steps of: (1) loading a piece to be tested in a culture test barrel; (2) arranging a metal test terminal at the top of the piece to be tested and immediately putting the tested piece in a constant-temperature waterbath to culture; (3) stabilizing for a period of time, slightly increasing the temperature, confirming a test end point when the internal temperature of the piece to be tested is constant with the water temperature, then decreasing the temperature to a start temperature and circulating; (4) testing the displacement values of the bottom and the top of the piece to be tested with a noncontact-type laser displacement sensor; and (5) calculating the early-period thermal expansion coefficient of the piece to be tested according to tested displacement change data. The equipment comprises the culture test barrel containing the piece to be tested, a constant-temperature water bath case is arranged outside the barrel, the culture test barrel is internally provided with the metal test terminal which is pre-buried at the top end of the piece to be tested, and the noncontact-type laser displacement sensor is arranged on the culture test barrel. The invention overcomes the defects of the prior art and provides a noncontact-type in-situ displacement test to acquire the early-period thermal expansion coefficient of the concrete dam.
Description
Technical field
The present invention relates to the early stage thermal property measuring technology of dam concrete, be specifically related to a kind of method of testing and equipment thereof of contactless early-period thermal expansion coefficient of concrete dam, this is that a kind of employing non-contact laser displacement transducer and circulating water bath with thermostatic control are combined into contactless early-period thermal expansion coefficient of concrete dam method of testing.
Background technology
Thermal expansivity is one of concrete main thermophysical property parameter, also is the important characterization parameter of its volume stability; The dam concrete thermal expansivity generally adopts linear expansion coefficient to characterize, " concrete for hydraulic structure test specification " (SL 352-2006) requires test specimen to test behind the maintenance 7d at least again, allow to adopt the test specimen that tests the distortion of concrete own vol to test simultaneously, so what often record is the thermal expansivity of concrete middle and later periods, concrete is out in the cold at the thermal expansivity at sclerosis initial stage.
The early stage hot expansibility assay method of cement-based material does not still have unified regulation at present, various test occurs.The significantly temperature rise (requiring the intensification amplitude as " concrete for hydraulic structure test specification " is about 40 ℃) that conventionally test thermal expansion coefficient of concrete need add test specimen, appreciable impact concrete early hydration like this, make test result and hydration age that deviation be arranged, one group of test specimen often can only be tested thermal expansivity in a certain length of time, the difficult follow-on test different thermal expansivity in the length of time early of test specimen on the same group of realizing; Because early stage dam concrete intensity is lower, adopt conventional contact length-measuring method to be difficult to guarantee result's accuracy simultaneously.
Along with the development of high-precision laser displacement transducer technology, make original position noncontact, follow-on test displacement become possibility.This patent adopts non-contact displacement sensor in conjunction with circulating constant temperature water bath apparatus, and the mode by small size temperature rise has realized original position, follow-on test early-period thermal expansion coefficient of concrete dam.
Summary of the invention
The method of testing and the equipment thereof that the purpose of this invention is to provide a kind of contactless early-period thermal expansion coefficient of concrete dam, to remedy the following deficiency of prior art, that is: measured is the thermal expansivity of concrete middle and later periods, has ignored the thermal expansivity of concrete at the sclerosis initial stage.The present invention adopts non-contact laser displacement transducer and circulating water bath with thermostatic control to be combined into contactless original position displacement measurement early-period thermal expansion coefficient of concrete dam.
The scheme of finishing the foregoing invention task is: a kind of method of testing of contactless early-period thermal expansion coefficient of concrete dam is characterized in that step is as follows:
(1), the test specimen of newly the mixing dam concrete maintenance test bucket of directly packing into;
(2), the test specimen TOC inserts the metallic test termination, puts into the water bath with thermostatic control maintenance immediately;
(3), after a period of stabilisation, slightly heat up, be the test terminal point when waiting test specimen concrete internal temperature consistent with water temperature, cold water cooling immediately so circulates until origin temp;
(4), utilize the non-contact laser displacement transducer above the maintenance test bucket to measure bottom the test specimen and the shift value at top;
(5), according to the measured displacement delta data, calculate the early stage thermal expansivity of test specimen.
More optimize and more particularly, the method for operating of each step of the present invention is:
(1), newly mix the dam concrete maintenance test bucket of directly packing into, this maintenance test bucket adopts the φ 150mm * 300mm right cylinder tinplate bucket of bottom pad polyfluortetraethylene plate;
(2), the test specimen TOC inserts the metallic test termination, puts into the water bath with thermostatic control maintenance immediately;
(3), slightly heat up after a period of stabilisation, be the test terminal point when waiting test specimen concrete internal temperature consistent with water temperature, cold water cooling immediately is until origin temp, the like this circulation;
(4), the measured displacement of non-contact laser displacement transducer changes δ
AllValue can be reduced to two parts displacement, and a part is the thermal expansion displacement δ of test specimen
s, another part is the thermal expansion displacement δ of right cylinder tinplate bucket bottom and top test cap
o
(5), wherein displacement can be calculated gained according to material coefficient of thermal expansion factor alpha, datum length L and the temperature change value Δ that records T, referring to following formula (1):
δ
all＝δ
s+δ
o， δ＝L·α·ΔT (1)
Final concrete sample thermal expansivity can calculate gained by following formula (2):
α
s＝(δ
all-L
o·α
o·ΔT)/(L
s·ΔT) (2)
Wherein: L
oBe tinplate bucket, test cap (irony) overall height, L
sBe concrete sample datum length 300mm, α
0Thermal expansivity for iron.
The present invention recommends: 0.2 ℃ of water bath with thermostatic control temperature control precision; Displacement transducer shows reading 1 μ m.
According to " 4.17 concrete linear expansion coefficient determining " method in the standard " concrete for hydraulic structure testing regulations " (SL 352-2006), the method for the pre-buried strain ga(u)ge of employing inside concrete records the thermal expansivity of above-mentioned two kinds of concrete behind 90d and is respectively 8.0 * 10
-6/ ℃ and 9.7 * 10
-6/ ℃, with the 7d of this test unit test basically identical as a result, consider that concrete later stage thermal expansivity is comparatively stable, explanation adopts this patent proving installation and standard test method to record result's good relationship thus.
The scheme of finishing the 2nd invention task of the application is: the employed equipment of the method for testing of above-mentioned contactless early-period thermal expansion coefficient of concrete dam, be provided with the maintenance test bucket that holds test specimen, it is characterized in that, this maintenance test bucket peripheral hardware has constant water bath box, and this constant water bath box is provided with heating arrangement and temperature control equipment; Be provided with the metallic test termination that is embedded in the test specimen top in this maintenance test bucket; This is provided with the non-contact laser displacement transducer above maintenance test bucket.
The prioritization scheme of this equipment has:
Metallic test smooth, irony termination, plane is adopted in described metallic test termination;
Be provided with temperature sensor in the described constant water bath box;
Be provided with temperature sensor in the described test specimen;
Described maintenance test barrel structure is: φ 150mm * 300mm right cylinder tinplate bucket, its bottom is lined with polyfluortetraethylene plate.
The present invention can remedy the following deficiency of prior art, that is: measured is the thermal expansivity of concrete middle and later periods, has ignored the thermal expansivity of concrete at the sclerosis initial stage; Adopt non-contact laser displacement transducer and circulating water bath with thermostatic control to be combined into contactless original position displacement measurement and obtain early-period thermal expansion coefficient of concrete dam.
Description of drawings
Fig. 1 is the temperature control curve figure of test process;
Fig. 2 is the early stage thermal expansivity change curve of face dam concrete;
Fig. 3 is the early stage thermal expansivity change curve of arch dam concrete;
Fig. 4 is the present device structural representation.
Embodiment
Embodiment 1, the method for testing of contactless early-period thermal expansion coefficient of concrete dam, the proving installation of employing such as Fig. 4.
Newly mix directly pack into the φ 150mm * 300mm right cylinder tinplate bucket 2 (secondary is joined concrete and directly packed into, packs into behind the full grating dam concrete wet screening) of bottom pad polyfluortetraethylene plate of dam concrete; TOC is inserted the metallic test termination, puts into water bath with thermostatic control 3 maintenances immediately.Be equipped with thermometer 4 in water bath with thermostatic control 3 and the concrete 1.Test specimen in the tinplate bucket---newly mix dam concrete 1 top and adopt the PVC film to cover, the metallic test termination (irony) that pre-buried plane is smooth, test process avoids steam to condense in the termination, influences the stable testing of laser displacement sensor; Through test adjustment, proving installation has good stability, and the fluctuation of constant temperature bottom offset is not more than 1 μ m.
Because the higher precision of displacement transducer even small size temperature rise still can collect the change in displacement of test specimen, has at utmost reduced the influence of temperature rise to the normal aquation of test specimen.
Test process is taked small size intensification (temperature rise only is about 5 ℃), quick round-robin temperature control system, and the control single test duration is no more than 2h (typical temperature increasing schedule is seen Fig. 1).Test specimen maintenance in 20 ℃ ± 3 ℃ waters bath with thermostatic control slightly heats up after a period of stabilisation, is the test terminal point when waiting concrete internal temperature consistent with water temperature, and cold water cooling immediately so circulates until origin temp.
5 measured displacements of non-contact laser displacement transducer change δ
AllValue can be reduced to two parts displacement, and a part is the thermal expansion displacement δ of test specimen
s,, another part is the thermal expansion displacement δ of iron sheet barrel bottom and top test cap
oWherein displacement can be calculated gained according to material coefficient of thermal expansion factor alpha, datum length L and the temperature change value Δ that records T, referring to following formula (1).
δ
all＝δ
s+δ
o，δ＝L·α·ΔT (1)
Final concrete sample thermal expansivity can calculate gained by following formula (2):
α
s＝(δ
all-L
o·α
o·ΔT)/(L
s·ΔT) (2)
Wherein: L
oBe tinplate bucket, test cap (irony) overall height, L
sBe concrete sample datum length 300mm, α
0Thermal expansivity for iron.
Fig. 2,3 is for adopting panel two grating normal concretes that above-mentioned proving installation records and the early stage thermal expansivity of the full grating wet screening of arch dam concrete with variation diagram in the length of time, and horizontal ordinate is sclerosis back concrete length of time.Wherein panel concrete progressively increases at sclerosis initial stage thermal expansivity, and institute's interior extreme difference in the length of time of surveying is 1.9 * 10
-6/ ℃, 72h to 156h is stable gradually to 8.1 * 10
-6/ ℃; The arch dam normal concrete is bigger in the sclerosis Initial change, and institute's interior extreme difference in the length of time of surveying is up to 3.8 * 10
-6/ ℃, progressively stable behind the 72h to 10.5 * 10
-6/ ℃.
Claims (2)
1. the method for testing of a contactless early-period thermal expansion coefficient of concrete dam is characterized in that, step is as follows:
(1), the test specimen of newly the mixing dam concrete maintenance test bucket of directly packing into;
(2), the test specimen TOC inserts the metallic test termination, puts into the water bath with thermostatic control maintenance immediately;
(3), after a period of stabilisation, slightly heat up, be the test terminal point when waiting test specimen concrete internal temperature consistent with water temperature, cold water cooling immediately so circulates until origin temp;
(4), utilize the non-contact laser displacement transducer above the maintenance test bucket to measure bottom the test specimen and the shift value at top;
(5), according to the measured displacement delta data, calculate the early stage thermal expansivity of test specimen;
The concrete operation method of described each step is:
(1), newly mix the dam concrete maintenance test bucket of directly packing into, this maintenance test bucket adopts the right cylinder tinplate bucket of bottom pad polyfluortetraethylene plate;
(2), the test specimen TOC inserts the metallic test termination, puts into the water bath with thermostatic control maintenance immediately;
(3), slightly heat up after a period of stabilisation, be the test terminal point when waiting test specimen concrete internal temperature consistent with water temperature, cold water cooling immediately is until origin temp, the like this circulation;
(4), the measured displacement of non-contact laser displacement transducer changes d
AllValue can be reduced to two parts displacement, and a part is the thermal expansion displacement d of test specimen
s, another part is the thermal expansion displacement d of right cylinder tinplate bucket bottom and top test cap
o
(5), wherein displacement can be calculated gained according to material coefficient of thermal expansion coefficient a, datum length L and the temperature change value Δ that records T, referring to following formula (1):
δ
all＝δ
s+δ
o，δ＝L·α·ΔT(1)
Final test specimen thermal expansion coefficient of concrete can calculate gained by following formula (2):
α
s＝(δ
all-L
o·α
o·ΔT)/(L
s·ΔT)(2)
Wherein: L
oBe tinplate bucket, irony test cap overall height, L
sBe concrete sample datum length 300mm, a
0Thermal expansivity for iron.
2. the method for testing of contactless early-period thermal expansion coefficient of concrete dam according to claim 1 is characterized in that, 0.2 ℃ of described water bath with thermostatic control temperature control precision; Displacement transducer shows reading 1 μ m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102000120A CN101865865B (en) | 2010-06-12 | 2010-06-12 | Noncontact-type test method of early-period thermal expansion coefficient of concrete dam and equipment thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102000120A CN101865865B (en) | 2010-06-12 | 2010-06-12 | Noncontact-type test method of early-period thermal expansion coefficient of concrete dam and equipment thereof |
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| Publication Number | Publication Date |
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| CN101865865A CN101865865A (en) | 2010-10-20 |
| CN101865865B true CN101865865B (en) | 2011-12-28 |
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| CN103293180B (en) * | 2013-06-19 | 2015-06-03 | 福州大学 | Suspension type concrete early-age thermal expansion coefficient testing method and device thereof |
| CN103558246B (en) * | 2013-11-08 | 2015-10-28 | 山东大学 | Road surface expansion coefficient of cement concrete proving installation and method |
| CN105738407B (en) * | 2016-03-01 | 2019-02-01 | 中国科学院国家天文台 | Anchor cup thermal expansion coefficient detection method and detection device |
| CN106979958B (en) * | 2017-04-01 | 2019-08-02 | 河海大学 | A kind of concrete dam linear expansion coefficient on-site measurement device and measuring method |
| CN107764854A (en) * | 2017-10-25 | 2018-03-06 | 汤庆佳 | A kind of Temperature Control Type linear expansion coefficient measuring apparatus |
| CN109164133A (en) * | 2018-08-30 | 2019-01-08 | 广西交投科技有限公司 | A kind of cement concrete linear expansion coefficient test device and its test method |
| CN109238376B (en) * | 2018-11-09 | 2021-07-20 | 中南大学 | Method for monitoring deformation and stress of cement-based material in steam curing process |
| CN109458925B (en) * | 2019-01-04 | 2020-08-14 | 中南大学 | Dynamic deformation testing method for cement-based material in thermal curing process |
| CN111122836A (en) * | 2020-01-16 | 2020-05-08 | 中铁第五勘察设计院集团有限公司 | Shrinkage value testing system, die system and shrinkage value testing method |
| CN111638240A (en) * | 2020-04-22 | 2020-09-08 | 河海大学 | Device and method for measuring thermal expansion coefficient of early-age pervious concrete by water bath method |
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Effective date of registration: 20231211 Address after: 210029 No. 223, Guangzhou Road, Gulou District, Jiangsu, Nanjing Patentee after: NANJING HYDRAULIC Research Institute Patentee after: CHINA COMMUNICATION CONSTRUCTION COMPANY FIRST HARBOUR CONSULTANTS Co.,Ltd. Address before: 210029 No. 223, Guangzhou Road, Nanjing, Jiangsu Patentee before: NANJING HYDRAULIC Research Institute |