CN103592176A - Electromagnetic loading device for concrete durability test - Google Patents

Electromagnetic loading device for concrete durability test Download PDF

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Publication number
CN103592176A
CN103592176A CN201310585260.5A CN201310585260A CN103592176A CN 103592176 A CN103592176 A CN 103592176A CN 201310585260 A CN201310585260 A CN 201310585260A CN 103592176 A CN103592176 A CN 103592176A
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China
Prior art keywords
concrete
iron core
pressing plate
loading device
direct
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CN201310585260.5A
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CN103592176B (en
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韩建德
梁羽
刘伟庆
王曙光
徐锋
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Nanjing Tech University
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Nanjing Tech University
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Abstract

The invention discloses an electromagnetic loading device for a concrete durability test. The electromagnetic loading device comprises an upper pressing plate, direct-current coils, two iron cores, iron core brackets, upper bolts, lower bolts, a lower pressing plate, concrete test pieces, cushion rods and a direct-current power supply, wherein the concrete test piece is arranged between the upper pressing plate and the lower pressing plate; the cushion rods are arranged between the upper pressing plate and each concrete test piece, between the concrete test pieces and between the concrete test piece and the lower pressing plate; the iron core brackets are arranged on the two sides of the concrete test piece respectively; the lower parts of the iron core brackets are fixed to the lower pressing plate through the lower bolts; the upper parts of the iron core brackets are connected with the iron cores through the upper bolts; the two iron cores are wound with the direct-current coils respectively; the direct-current coils are connected with the direct-current power supply. The electromagnetic loading device is suitable for the durability test of a concrete material under the coupling effect of load and corrosion environment factors, and can be used for achieving accurate load application and keeping non stress relaxation in a long-term loading process.

Description

A kind of electromagnetic loading device for concrete durability experiment
Technical field
The invention belongs to cement and concrete foundation research field, relate to a kind of charger that utilizes electromagnetic principle, be specifically related to a kind of electromagnetic loading device for concrete durability experiment.
Background technology
In recent years since, xoncrete structure causes the accident of xoncrete structure premature failure destruction, the lost of life to be on the increase because permanance is not enough, especially the Important Project such as dam, road, bridge, harbour and high-rise do not reach design period and happen occasionally with regard to the accident of destroying, and cause tremendous economic loss and casualties.Although the research of relevant concrete durability has decades, the permanance under the effect of single environment destructive factor is considered in research work more; Yet in fact, the concrete permanance of Practical Project should be moved under stress and varying environment acting in conjunction, permanance research under single factors effect is difficult to reflect truly objective reality, and concrete permanance is the result under multifactor acting in conjunction.Consider in Practical Project, structural concrete is all worked and is moved under loaded state.Therefore, concrete durability under research load and other environmental disruption factor actings in conjunction, system is carried out concrete durability research under multiple damage factors effect, is great science and technology and the theoretical difficult problem of current concrete subject.
Concrete durability under research load and other environmental disruption factor actings in conjunction, top priority is exactly to set up the test unit that can simultaneously consider a plurality of destructive factors.This type of test unit is designed with 2 gordian techniquies and must solves: 1. plate test loading system can for a long time, accurately be controlled the payload values applying; 2. experiment loading unit has corrosion resistance.
Under counter stress effect both at home and abroad, seldom, comprehensive existing documents and materials are not difficult to find, adopt according to the spring charging device of Hooke's law of existing test loading more in concrete durability research.Principle of device is simple, volume is little, is applicable to the permanance instruments such as existing standard carbonization case, can realize the multifactor coupling of stress-environment, and once can realize 3 test blocks are loaded simultaneously, has greatly improved efficiency; Its shortcoming is: 1. use the elastic coefficient of sampling as the elasticity coefficient of all springs, the subtle change of spring constant can cause very large loads change, makes the power that spring assembly applies on individuality, have very large deviation, causes accurately loading; 2. there is Stress relaxation in spring charging device in holding for a long time lotus process; 3. in the concrete durability experiment under load and corrosion environment coupling, spring charging device is subject to the impact of corrosion, and spring useful area constantly reduces, and causes charger to lose efficacy.
Above-mentioned shortcomings has seriously limited the widespread use of flexural tensile stress charger in concrete multi-factors durability test.Therefore, development is applicable to concrete erosion test, energy is load application accurately, and unstressed lax charger in lotus process is held in maintenance for a long time, there is important using value, prospect is very wide, is concrete durability under research load and other environmental disruption factor actings in conjunction, and system is carried out concrete durability research under multiple damage factors effect provides experimental basis.
Summary of the invention
The object of the invention is to for deficiency of the prior art and defect, utilize electromagnetic principle, develop a kind of endurancing of concrete material under load and corrosion environment coupling that be applicable to, can realize accurate load application, and keep holding for a long time unstressed lax charger in lotus process.
The technical solution used in the present invention is: a kind of electromagnetic loading device for concrete durability experiment, comprise top board, DC coil, iron core, iron core bracket, upper bolt, lower bolt, lower platen, concrete sample, pad rod and direct supply, described concrete sample is arranged between top board and lower platen, between top board and concrete sample, between each concrete sample, between concrete sample and lower platen, be equipped with pad rod, the both sides of described concrete sample are respectively equipped with iron core bracket, the bottom of iron core bracket is fixed on lower platen by lower bolt, the top of iron core bracket is connected with iron core by upper bolt, two iron cores are arranged with respectively DC coil, DC coil is connected with direct supply.
Feature of the present invention:
1, the accurately solution of loading problem
In original spring-loaded system, elasticity coefficient with the elastic coefficient sampling as all springs, and the subtle change of spring constant can cause very large loads change, on the power individuality that spring assembly is applied, there is very large deviation, cause accurately loading.For carrying out accurately applying of load, this charger is used the mechanical force of the magnetic force replacement spring assembly generation of electromagnet generation instead.The magnetic field that electromagnet produces is relevant with the ferromagnet at size of current, wire circle and center, after selected suitable coil distribution and ferromagnet, the power in magnetic field is directly proportional to size of current, thereby can be by regulating electric current accurately to control magnetic force size, easy operating.
2, the solution of the Stress relaxation of spring charging device in holding for a long time lotus process
Original spring-loaded system is in holding for a long time lotus process, although the decrement of spring does not become, restoring force constantly reduces.This charger utilizes electromagnetic principle, once iron core is energized coil magnetizing, only need the size of electric current in keeping coil, electromagnet will keep magnetic for a long time and not demagnetize, thereby make charger maintain all the time original upload value in long durability test, avoided the problem of stress relaxation.
3, charger is corroded and the solution of Problem of Failure
In concrete durability experiment under load and corrosion environment acting in conjunction, spring charging device is subject to the impact of corrosion, and spring useful area constantly reduces, and causes charger to lose efficacy.This charger after encapsulation process, can be put into charger corrosive solution, gas for the endurancing of the concrete material under load and corrosion environment coupling to electromagnet apparatus.
As preferably, for avoiding the magnetic field of electromagnet to produce magnetic force to metal gasket rod, thereby disturb loading procedure, in electromagnetic loading device, adopt mortar pad rod to replace metal gasket rod.
The present invention, according to electromagnetic principle, utilizes the electromagnetic force that top board is subject to load concrete sample, by regulating the power of electric current in DC coil, realizes the accurate control to load.The present invention is applicable to the endurancing of concrete material under load and the coupling of corrosion environment factor, can realize accurately applying of load, and keeps holding for a long time in lotus process unstressed lax.
Beneficial effect:
1, to take volume little for charger of the present invention, can utilize existing carbonization case, chemical corrosion experimental box etc., realizes the endurancing of the concrete material under load and corrosion environment coupling, and meet the requirement of test in enormous quantities in a short time.
2, application of force method of the present invention is simple, unstressed relaxation in loading procedure.
3, charger of the present invention, to electromagnet apparatus through encapsulation process, can be avoided in process of the test, occurring charger generation corrosion and the STRESS VARIATION that causes.
Accompanying drawing explanation
Fig. 1 is the structural representation of charger of the present invention;
Fig. 2 is the side view of Fig. 1.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention will be further described.
As depicted in figs. 1 and 2, the core component of electromagnetic loading device is electromagnet apparatus, and electromagnet consists of top board 1, DC coil 3, iron core 2, iron core bracket 4.Wherein, top board 1 plays the effect of armature in electromagnet, and top board 1 is steel plate material.Iron core 4 consists of core lamination stack and stainless steel iron core shell.Core lamination stack is that the U-shaped silicon steel sheet that 90 degree bend up is overrided to form, and rigidity is less, for increase electromagnet integral rigidity and prevent corrosion, in core lamination stack outsourcing the stainless steel iron core of one deck shell.Iron core shell is welded structure, with bolt and core lamination stack, fixes, and core lamination stack is compressed to compacting, and the bottom of iron core shell adopts upper bolt 5 to be fixed on lower platen 7.Open direct supply 10, the DC coil 3 after energising produces magnetic field, and the iron core 2 in coil is magnetized, and forms electromagnet, and top board 1 is produced to electromagnetic force.Top board 1 is as the stressed object of electromagnetic force, to concrete sample 8 load applications.
The top of iron core bracket 4 adopts upper bolt 5 to be connected with iron core 2, and the bottom of iron core bracket 4 utilizes lower bolt 6 to be fixed on lower platen 7.Between top board 1 and lower platen 7, be provided with concrete sample 8, between each concrete sample 8 and between concrete sample 8 and top board 1 or lower platen 7, be provided with pad rod 9.
For avoiding the magnetic field of electromagnet to produce magnetic force to metal gasket rod, thereby disturb loading procedure, so adopt mortar pad rod to replace metal gasket rod in this electromagnetic loading device.The method for making of mortar pad rod is: prepare the mortar specimen that water cement ratio is less than 0.36, maintenance is taken out for 28 days afterwards, after it is dry, uses toothless saw to cut out two mortar pad rods, then is polished into the shape of the required pad rod of test.
During concrete durability experiment under carrying out load and corrosion environment coupling, first get three concrete samples of same match ratio and do four-point bending test, obtain average bending strength; Then utilize the electromagnetic loading device shown in Fig. 1 to concrete sample load application, make concrete sample the first half bear curved action of compressive stress, the latter half is born flexural tensile stress effect.Charger outer side center span is 3/4 of test specimen length, and inner side fulcrum span is 1/4 of test specimen length.During load application, should slowly strengthen the size of current of direct supply, until the stress that top board applies concrete sample reaches after the stress ratio of regulation, keep size of current constant.After loaded, the concrete sample with charger is placed in the test cabin of the permanance devices such as carbonization case, chemical corrosion experimental box, carries out the endurancing under the multiple couplings of environment such as load, carbonization and chemical corrosion.
It should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.In the present embodiment not clear and definite each ingredient all available prior art realized.

Claims (2)

1. the electromagnetic loading device for concrete durability experiment, it is characterized in that: comprise top board, DC coil, iron core, iron core bracket, upper bolt, lower bolt, lower platen, concrete sample, pad rod and direct supply, described concrete sample is arranged between top board and lower platen, between top board and concrete sample, between each concrete sample, between concrete sample and lower platen, be equipped with pad rod, the both sides of described concrete sample are respectively equipped with iron core bracket, the bottom of iron core bracket is fixed on lower platen by lower bolt, the top of iron core bracket is connected with iron core by upper bolt, two iron cores are arranged with respectively DC coil, DC coil is connected with direct supply.
2. a kind of electromagnetic loading device for concrete durability experiment according to claim 1, is characterized in that: described pad rod is mortar pad rod.
CN201310585260.5A 2013-11-19 2013-11-19 A kind of electromagnetic loading device for concrete durability experiment Expired - Fee Related CN103592176B (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104316555A (en) * 2014-10-10 2015-01-28 广东电网有限责任公司电力科学研究院 Varying-stress high-temperature ageing device containing water vapor
CN105334109A (en) * 2015-11-27 2016-02-17 中国矿业大学 Test device for simulating complicated loads based on electromagnetic field, and test method using test device
CN106546496A (en) * 2017-01-23 2017-03-29 重庆科技学院 The triaxial rheological experiment device of electromagnetism loading
CN106706447A (en) * 2017-01-23 2017-05-24 重庆科技学院 Rheological direct-shear test device based on electromagnetic force
CN107817165A (en) * 2017-11-28 2018-03-20 嘉峪关天源新材料有限责任公司 A kind of device for being used to determine steel stress corrosion behavior in corrosive environment
CN109932238A (en) * 2019-04-22 2019-06-25 广州建设工程质量安全检测中心有限公司 A kind of crumbs collector of concrete anti-compression testing machine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000193572A (en) * 1998-12-28 2000-07-14 Kanto Auto Works Ltd Test apparatus for evaluating durability of concrete, and durability evaluating method of concrete
JP2003065918A (en) * 2001-08-30 2003-03-05 Shimadzu Corp Material-testing machine
CN201181268Y (en) * 2008-03-04 2009-01-14 东南大学 Concrete durability test instrument
CN102998174A (en) * 2011-09-09 2013-03-27 中交四航工程研究院有限公司 Long-term loading apparatus system for concrete sample durability tests
CN203785951U (en) * 2013-11-19 2014-08-20 南京工业大学 Electromagnetic loading device for concrete durability tests

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000193572A (en) * 1998-12-28 2000-07-14 Kanto Auto Works Ltd Test apparatus for evaluating durability of concrete, and durability evaluating method of concrete
JP2003065918A (en) * 2001-08-30 2003-03-05 Shimadzu Corp Material-testing machine
CN201181268Y (en) * 2008-03-04 2009-01-14 东南大学 Concrete durability test instrument
CN102998174A (en) * 2011-09-09 2013-03-27 中交四航工程研究院有限公司 Long-term loading apparatus system for concrete sample durability tests
CN203785951U (en) * 2013-11-19 2014-08-20 南京工业大学 Electromagnetic loading device for concrete durability tests

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104316555A (en) * 2014-10-10 2015-01-28 广东电网有限责任公司电力科学研究院 Varying-stress high-temperature ageing device containing water vapor
CN105334109A (en) * 2015-11-27 2016-02-17 中国矿业大学 Test device for simulating complicated loads based on electromagnetic field, and test method using test device
CN106546496A (en) * 2017-01-23 2017-03-29 重庆科技学院 The triaxial rheological experiment device of electromagnetism loading
CN106706447A (en) * 2017-01-23 2017-05-24 重庆科技学院 Rheological direct-shear test device based on electromagnetic force
CN107817165A (en) * 2017-11-28 2018-03-20 嘉峪关天源新材料有限责任公司 A kind of device for being used to determine steel stress corrosion behavior in corrosive environment
CN109932238A (en) * 2019-04-22 2019-06-25 广州建设工程质量安全检测中心有限公司 A kind of crumbs collector of concrete anti-compression testing machine

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