CN106352819A - Device for measuring self-shrinkage of cement concrete for construction engineering - Google Patents

Device for measuring self-shrinkage of cement concrete for construction engineering Download PDF

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Publication number
CN106352819A
CN106352819A CN201610661996.XA CN201610661996A CN106352819A CN 106352819 A CN106352819 A CN 106352819A CN 201610661996 A CN201610661996 A CN 201610661996A CN 106352819 A CN106352819 A CN 106352819A
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China
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test specimen
cement concrete
casing
measuring device
push rod
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CN201610661996.XA
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CN106352819B (en
Inventor
赵东旭
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Hangzhou Fanghui Construction Engineering Testing Co., Ltd.
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赵东旭
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B13/00Measuring arrangements characterised by the use of fluids
    • G01B13/24Measuring arrangements characterised by the use of fluids for measuring the deformation in a solid

Abstract

The invention discloses a device for measuring self-shrinkage of cement concrete for construction engineering. The device comprises a test piece accommodating tank. The test piece accommodating tank is used for accommodating cement concrete test pieces; a gas inlet is formed in the test piece accommodating tank, and gas can be inputted into the test piece accommodating tank via the gas inlet; the test piece accommodating tank is communicated with a reading container via a balance pipeline, and a gas pressure balance piston is arranged on the balance pipeline; the reading container is provided with a spiral pushing-in rod connector, and the spiral pushing-in rod connector is provided with internal threads; a spiral pushing-in rod is provided with external threads and is connected with the spiral pushing-in rod connector in a threaded manner; balance point coordinates are arranged on the balance pipeline, reading scales are arranged on the outer surface of the reading container, and shrinkage volumes of the cement concrete test pieces can be determined by the aid of the balance point coordinates and the reading scales.

Description

A kind of architectural engineering cement concrete self-shrinkage measuring device
Technical field
The present invention relates to a kind of measurement apparatus, especially relate to a kind of measurement apparatus of concrete self-shrinkage.
Background technology
Concrete refers to the cementing general designation closing all engineered composite materials of gathering materials by Binder Materials.The coagulation usually said A native word refers to make Binder Materials with cement, and sand, masonry gather materials;Match by a certain percentage with water, agitated, molding, maintenance and The cement concrete obtaining.
Concrete shrinkage is concrete material characteristic inherently.The contraction of concrete refers to due to contained in concrete Macroscopical volume contracting that the factors such as the change of moisture, chemical reaction and temperature change cause.When concrete is in free state, mix Solidifying soil shrinks and is not result in adverse consequencess.In actual engineering, xoncrete structure is subject to basis, reinforcing bar or adjacent part to pin down and can locate In different restrained conditions, cause concrete pulling stress, because concrete tensile strength is not high, concrete shrinkage crack easily produces Raw.The bearing capacity and the service life that produce light then impact structure of distress in concrete, heavy then catastrophic accident can be led to, give National economy brings massive losses, gives people the people and brings safely grave danger.
China is in rapid economic development period at present, and infrastructural project amount is very huge, the annual consumption of concrete Also increase rapidly, if not solving contraction and the bad problem of crack resistance of concrete generally existing, our infrastructural project Quality will no collateral security.Therefore, the research of concrete shrinkage is constantly subjected to the attention of domestic and international academia and engineering circles.
In prior art, mainly pass through volumetric method or displacement method measures concrete shrinkage, by for mixed before and after shrinking The change in volume of solidifying soil or the self-constriction of length change measurement concrete.In conventional volumetric method test, such as Chinese architecture material Water, in 201410398887.4 patent of invention, injects, by observed stage into measure case body in the material total institute of scientific research Change, determines the change of volume of concrete in measure case body.But, because water can enter in volume of concrete, affect concrete Self-constriction characteristic, leads to there is difference in the result measuring and actual environment.In some improved technical schemes, replaced using oil Change water as the injection liquid of measure case, but still can produce impact to the shrinkage of concrete.
Content of the invention
As one aspect of the present invention, there is provided a kind of architectural engineering cement concrete self-shrinkage measuring device, comprising: Test specimen accommodates casing, and for accommodating cement concrete test specimen, it is provided with unlatching door, can be by coagulating cement by this unlatching door Native test specimen is positioned in described test specimen storage case body;Described test specimen accommodates casing and is provided with gas access, by described gas energy Enough gas is inputted described test specimen and accommodate casing so as to interior have sufficiently high air pressure;Described test specimen accommodates casing and passes through balance Pipeline is communicated with reading container, and described equalizing line arranges air pressure balance piston;Described reading container setting setting spiral pushes away Enter bar interface, described spiral push rod interface arranges female thread;Spiral push rod arranges external screw thread, described spiral push rod and institute State spiral push rod interface thread to connect;Setting balance point coordinates on described equalizing line, described reading container outer surface setting Read text scale, can determine the retraction volume of cement concrete test specimen by balancing point coordinates and described read text scale.
Preferably, described spiral push rod top arranges sealing rubber cover, makes described spiral push rod interface keep airtight Property.
Preferably, described test specimen accommodates casing and described reading container is in closed state in measurement process.
Preferably, multiple air-tightness implants are also included, described implant length accommodates the minor face of box bottom with test specimen Equal, width accommodates the 1/n on the long side of box bottom for test specimen, highly accommodates the 1/m of box height for test specimen, wherein m, n are Integer more than 1.
Preferably, described air-tightness implant is hollow resin block.
Preferably, box volume is accommodated according to test specimen volume and test specimen, determine that the air-tightness putting into test specimen storage case is filled out Fill the number of thing.
Preferably, the volume of the initial volume according to cement concrete test specimen and test specimen receiving casing, air-tightness is filled out Fill thing to be positioned in test specimen storage case body, after making placement air-tightness implant and cement concrete test specimen, test specimen accommodates casing Interior residual volume is less than the 1/4 of its cumulative volume.
Preferably, described reading volume of a container is less than 1/4 that described test specimen accommodates casing.
Preferably, in measurement, gas is injected so as to air pressure inside is more than mark by the gas access that test specimen accommodates casing Quasi- atmospheric pressure.
Preferably, described reading container includes different first and second of sectional area, the section of described second Amass and be less than first, described spiral push rod interface is arranged at described second.
Preferably, the sectional area of described second is less than the 1/4 of first.
Brief description
Fig. 1 is the structural representation of the architectural engineering cement concrete self-shrinkage measuring device of the embodiment of the present invention.
Specific embodiment
In order to be illustrated more clearly that technical scheme, using embodiment, the present invention simply will be situated between below Continue it should be apparent that, below describe in be only one embodiment of the present of invention, for those of ordinary skill in the art come Say, without having to pay creative labor, other technical schemes can also be obtained according to these embodiments, fall within Disclosure of the invention scope.
The architectural engineering cement concrete self-shrinkage measuring device of the embodiment of the present invention, referring to Fig. 1, including test specimen storage case Body 1, equalizing line 2, air pressure balance piston 3, reading container 4, spiral push rod 5 and compressed air unit 6.
Test specimen accommodate casing 1, for accommodating cement concrete test specimen, its be provided with unlatching door 11, test specimen support member 12 with And gas access 13.Open door 11 to be used for cement concrete test specimen 7 is positioned in test specimen receiving casing 1, open door 11 permissible It is arranged at top or the sidepiece that test specimen accommodates casing 1.Test specimen support member 12 is used for placing cement concrete test specimen 7, and it is permissible It is provided in the supporting support that test specimen accommodates casing 1 bottom, or be provided in the suspension holdfast that test specimen accommodates casing 1 top. Preferably, when being used supporting support as test specimen support member 12, in the polyvinyl chloride plastic film that the setting of its superiors is flexible Layer, thus reducing the absorption for support member for the concrete, reduces restraining forceies.
The gas access 13 that test specimen accommodates casing 1 is communicated with compressed air unit 6, can be by gas by gas access 13 Input test specimen accommodates in casing 1 so as to interior have sufficiently high air pressure, and this sufficiently high air pressure may be greater than standard atmosphere Pressure is it is preferred that such as 2 times or 3 times of normal atmospheres.Pressure gage can be set in test specimen storage case body, for detecting it Interior gas pressure intensity.
Test specimen is accommodated casing 1 and is communicated with reading container 4 by equalizing line 2, and equalizing line 2 is transparent pipeline, can make With such as transparent resin as equalizing line 2 material.Setting air pressure balance piston 3 in equalizing line 2, equalizing line 2 midpoint sets Horizontalization weighing apparatus point coordinates 21.Dummy piston 3 is I-shape construction, in left and right pressure imbalance, can be mobile straight along equalizing line 2 To left and right pressure balance.
Reading container 4 includes different first 41 and second 42 of sectional area, and the sectional area of wherein second 42 is little In first 41.First 41 of reading container 4 is passed through equalizing line 2 and is communicated with test specimen receiving casing 1.The of reading container 4 Two 42 setting spiral push rod interfaces 43, spiral push rod interface 43 inner surface setting female thread.Spiral push rod 5 arranges outer Screw thread, is threadeded with spiral push rod interface 43.Spiral push rod 5 top arranges sealing rubber cover, so that spiral push rod is connect Mouth 43 holding air-tightness.
The outer surface of second 42 is provided with scale, it represents the volume of reading container 4, by screw thread push rod 5 phase For the position of scale, can determine reading volume of a container.
Cement concrete test specimen 7 is put into test specimen accommodate after casing 1, casing 1 is accommodated to test specimen by compressed air unit 6 Gas injection, until barometrical value reaches specified air pressure.Then, adjustable screw push rod 5 is in spiral push rod interface 43 Position, until the midpoint of dummy piston 3 is located at the balance point coordinates 21 of equalizing line 2, now test specimen accommodates casing 1 and reading Air pressure in container 4 is equal, the scale v of record spiral push rod interface 43 now1.Due to cement concrete test specimen 7 from Shrink, the gas volume increase that test specimen accommodates casing 1 leads to pressure to reduce, and dummy piston 3 is subject to gas pressure intensity in reading container 4 Left and right be moved to the left.After the specific period of interval, it is turned out spiral push rod 5, so that reading container 4 inner volume is increased, put down Weighing apparatus piston 3 moves right again, until the midpoint of dummy piston 3 is located at the balance point coordinates 21 of equalizing line 2, test specimen storage case Body 1 is in balance again with the air pressure in reading container 4, records the scale v of now spiral push rod interface 432.According to v1, v2, Test specimen accommodates casing 1 volume vs, the initial volume vc of cement concrete test specimen 7, you can determine now cement concrete test specimen 7 Volume vt=vs- v2(vs-vc)/ v1, so that it is determined that amount of contraction v=vc-vt of now cement concrete test specimen 7.In difference Chronometry cement concrete test specimen 7 amount of contraction, that is, can determine the Self-Shrinkage Property of cement concrete test specimen 7.
Because the volume of different concrete test blocks is different, for the concrete test block of small volume, test specimen accommodates in casing 1 Volume of air larger, and lead to change in volume that the self-constriction of concrete test block leads to respect to volume of air ratio relatively Little, thus leading to measurement result precision inadequate.Preferably, architectural engineering cement concrete self-shrinkage measuring device can also include Multiple air-tightness implants, the minor face that its length accommodates casing 1 bottom with test specimen is equal, and width accommodates casing 1 bottom for test specimen Long side 1/n, highly for test specimen accommodate casing 1 height 1/m, wherein m, n are the integer more than 1.Can be using for example empty Heart resin mass is as air-tightness implant.After concrete sample is put into test specimen receiving casing 1, according to concrete sample volume And test specimen accommodates casing 1 volume, determine the number of the air-tightness implant putting into test specimen storage case 1.Preferably, according to cement The initial volume of concrete sample and the volume of test specimen receiving casing, air-tightness implant are positioned over test specimen and accommodate casing Interior, after making placement air-tightness implant and cement concrete test specimen, it is overall that the residual volume in test specimen storage case body is less than it Long-pending 1/4.By such setting, the change of concrete test block during measurement is made to accommodate casing 1 volume of air relatively with respect to test specimen Greatly such that it is able to improve the precision of measurement result.
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.This Specific features described in bright, structure, material or feature can be with suitable in any one or more embodiments or example Mode combines.Additionally, in the case of not conflicting, those skilled in the art can be by the difference described in this specification The feature of embodiment or example and different embodiment or example is combined and combines.All the spirit and principles in the present invention it Interior made any modification, equivalent substitution and improvement etc., are all contained in protection scope of the present invention.

Claims (9)

1. a kind of architectural engineering cement concrete self-shrinkage measuring device, comprising: test specimen accommodates casing, for accommodating coagulating cement Native test specimen, it is provided with unlatching door, cement concrete test specimen can be positioned over described test specimen by this unlatching door and accommodate casing Interior;It is characterized in that: described test specimen accommodates casing and is provided with gas access, gas can be inputted institute by described gas access State test specimen and accommodate casing so as to interior have sufficiently high air pressure;Described test specimen accommodates casing and passes through equalizing line and reading container Communicate, described equalizing line arranges air pressure balance piston;Described reading container arranges spiral push rod interface, and described spiral pushes away Enter bar interface setting female thread;Spiral push rod arranges external screw thread, described spiral push rod and described spiral push rod interface spiral shell Stricture of vagina connects;Setting balance point coordinates on described equalizing line, described reading container outer surface arranges read text scale, by equilibrium point Coordinate and described read text scale can determine the retraction volume of cement concrete test specimen.
2. architectural engineering cement concrete self-shrinkage measuring device according to claim 1 it is characterised in that: described spiral Push rod top arranges sealing rubber cover, makes described spiral push rod interface keep air-tightness.
3. architectural engineering cement concrete self-shrinkage measuring device according to claim 2 it is characterised in that: described test specimen Accommodate casing and described reading container is in closed state in measurement process.
4. building building cement concrete self-shrinkage measuring device according to claim 3 it is characterised in that: measurement when pass through Test specimen accommodates the gas access injection gas of casing so as to air pressure inside is more than standard atmospheric pressure.
5. architectural engineering cement concrete self-shrinkage measuring device according to claim 4 it is characterised in that: described unlatching Door is arranged at top or the sidepiece that test specimen accommodates casing.
6. architectural engineering cement concrete self-shrinkage measuring device according to claim 5 it is characterised in that: described test specimen Setting pressure gage in storage case body, for detecting its interior gas pressure intensity.
7. architectural engineering cement concrete self-shrinkage measuring device according to claim 6 it is characterised in that: described test specimen Setting test specimen support member in storage case body, for placing cement concrete test specimen.
8. architectural engineering cement concrete self-shrinkage measuring device according to claim 7 it is characterised in that: described test specimen Support member is provided in the supporting support that test specimen accommodates box bottom.
9. architectural engineering cement concrete self-shrinkage measuring device according to claim 8 it is characterised in that: described support The flexible polyvinyl chloride plastic film layer of support the superiors setting.
CN201610661996.XA 2016-08-13 2016-08-13 A kind of architectural engineering cement concrete self-shrinkage measuring device Active CN106352819B (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109212171A (en) * 2018-11-19 2019-01-15 太原理工大学 Architectural engineering concrete self-shrinkage rate measuring device and method
CN111366110A (en) * 2020-05-28 2020-07-03 广东电网有限责任公司东莞供电局 Multifunctional measuring tool for power pipeline

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070137285A1 (en) * 2003-12-31 2007-06-21 Jennings Scott S Test apparatus for direct measurementof expansion and shrinkage of oil well cements
CN203011798U (en) * 2012-11-30 2013-06-19 长沙理工大学 Comprehensive fresh cement concrete performance tester
CN103323164A (en) * 2013-06-28 2013-09-25 东北大学 Testing system for measuring static cracking agent swelling pressure and testing method thereof
CN203981234U (en) * 2014-05-23 2014-12-03 包头市太阳满都拉电缆有限公司 Pneumatic process volume measurement device
CN104807720A (en) * 2015-05-20 2015-07-29 闫语童 Method for measuring object density based on air pressure process
CN105334142A (en) * 2015-12-16 2016-02-17 北京交通大学 Experiment device for simulating shield mud membrane formation

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20070137285A1 (en) * 2003-12-31 2007-06-21 Jennings Scott S Test apparatus for direct measurementof expansion and shrinkage of oil well cements
CN203011798U (en) * 2012-11-30 2013-06-19 长沙理工大学 Comprehensive fresh cement concrete performance tester
CN103323164A (en) * 2013-06-28 2013-09-25 东北大学 Testing system for measuring static cracking agent swelling pressure and testing method thereof
CN203981234U (en) * 2014-05-23 2014-12-03 包头市太阳满都拉电缆有限公司 Pneumatic process volume measurement device
CN104807720A (en) * 2015-05-20 2015-07-29 闫语童 Method for measuring object density based on air pressure process
CN105334142A (en) * 2015-12-16 2016-02-17 北京交通大学 Experiment device for simulating shield mud membrane formation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109212171A (en) * 2018-11-19 2019-01-15 太原理工大学 Architectural engineering concrete self-shrinkage rate measuring device and method
CN111366110A (en) * 2020-05-28 2020-07-03 广东电网有限责任公司东莞供电局 Multifunctional measuring tool for power pipeline
CN111366110B (en) * 2020-05-28 2020-08-14 广东电网有限责任公司东莞供电局 Multifunctional measuring tool for power pipeline

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