CN107870126B - New concrete compression column and armored concrete are by camber beam creep test device - Google Patents

New concrete compression column and armored concrete are by camber beam creep test device Download PDF

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Publication number
CN107870126B
CN107870126B CN201710942625.3A CN201710942625A CN107870126B CN 107870126 B CN107870126 B CN 107870126B CN 201710942625 A CN201710942625 A CN 201710942625A CN 107870126 B CN107870126 B CN 107870126B
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China
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concrete
camber
loading
armored concrete
plate
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CN201710942625.3A
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Chinese (zh)
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CN107870126A (en
Inventor
王永宝
苗晨曦
刘芳
宋帅
靳瑾
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太原理工大学
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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/08Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
    • G01N3/10Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
    • G01N3/12Pressure testing
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058Kind of property studied
    • G01N2203/0069Fatigue, creep, strain-stress relations or elastic constants
    • G01N2203/0075Strain-stress relations or elastic constants
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01NINVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02Details not specific for a particular testing method
    • G01N2203/06Indicating or recording means; Sensing means
    • G01N2203/067Parameter measured for estimating the property
    • G01N2203/0682Spatial dimension, e.g. length, area, angle

Abstract

The invention belongs to the concrete durability studying technological domain in field of civil engineering, specifically a kind of new concrete compression column and armored concrete are by camber beam creep test device.It solves the problems, such as individually to carry out concrete compression test block creep test and armored concrete space and loading efficiency by camber beam creep test when under existing laboratory environment condition, test block stand apparatus and frame-type armored concrete are crept by camber beam loading device including armored concrete loading beam, concrete compression, armored concrete loading beam is mounted on several concrete compressions by support roller bearing and creeps on the upside of test block stand apparatus, and frame-type armored concrete is equipped in the middle part of armored concrete loading beam by camber beam loading device.Each component manufacture difficulty of the present invention is small, easy for construction, and cost is relatively low and safe and reliable, and the reusable value of loading device is larger.

Description

New concrete compression column and armored concrete are by camber beam creep test device

Technical field

The invention belongs to the concrete durability studying technological domain in field of civil engineering, it is specifically a kind of can simultaneously into The creep test device of the test block of row concrete compression and armored concrete by camber beam.

Background technique

Concrete high, preferable material of overall economic efficiency as a kind of plasticity, in present building trade, especially bridge It is had obtained relatively broad application in girder construction.However, being influenced by concrete material shrinkage and creep, long span concrete bridge Structure will generate biggish deformation, and then significantly affect the service performance of structure, especially the operation security of high-speed railway bridge Property.In bridge structure other than the concrete structures such as pier stud are based on being pressurized, girder construction is primarily subjected to bending stress, and difference is answered There are significant differences for concrete creep performance under power state.Therefore, it by designing reasonable creep test device, and then inquires into The creep property of Cemented of different stresses solves at present to big the long term deformation behaviour of Accurate Prediction bridge structure The true problem of span bridge's TERM DEFORMATION forecasting inaccuracy has great theory and practice meaning.

Scholars have carried out a large amount of creep test to Ordinary Compressive Concrete test block at present, and obtain on this basis Many Concrete Creep Prediction Models, such as ACI209, CEB10, GL2000, B3 and B4 model.Subject to the proposition of above-mentioned model Really the TERM DEFORMATION of prediction bridge structure provides foundation.But model above is all based on concrete compression test block creep test knot What fruit obtained, the less concrete creep test result with reference to bending component.In recent years, more scholar has also gradually carried out coagulation The Creep Characteristics testing research of soil or reinforced beam, and compared concrete compression test block and armored concrete by camber beam Xu It is denaturalized the difference of energy.But previous research is tested the creeping property of different primary structure members using two kinds of devices mostly , such as lever, spring, spring lever formula or fluid pressure type loading device are used to concrete compression test block, it is mixed to reinforcing bar Solidifying soil is mostly used greatly counter weight type or hydraulic jack formula loading device by camber beam.Using different loading devices to concrete test block When carrying out creep test, biggish working space and the more hydraulic jack of number, the concrete of different stresses are needed Stress relation is not easy to control, and loading device is various, spends larger.This certainly will will cause biggish man power and material's waste, and The comparative study of concrete component Creep Characteristics in different stresses is also a greater impact.There has been no a kind of examinations at present Experiment device can carry out concrete compression test block and armored concrete simultaneously and be crept test by camber beam.

Summary of the invention

The purpose of invention is to solve individually to carry out concrete compression test block under existing laboratory environment condition and creep examination Space and loading efficiency problem when testing with armored concrete by camber beam creep test, provide a kind of new concrete compression column and Armored concrete is by camber beam creep test device.

The present invention takes following technical scheme: a kind of new concrete compression column and armored concrete are crept test by camber beam Device, including armored concrete loading beam, concrete compression creep test block stand apparatus and frame-type armored concrete by camber beam Loading device, armored concrete loading beam are mounted on several concrete compressions by support roller bearing and creep in test block stand apparatus Side, armored concrete loading beam middle part are equipped with frame-type armored concrete by camber beam loading device.

Further, concrete compression creep test block stand apparatus include compression concrete test block, vibrating string type strain sensing Device, spring fastening II, perforated steel plate, control bit top plate, control bit bottom plate, control threaded rod nut and spiral, control bit Spiral is connected between top plate and control bit bottom plate, spiral upper end passes through spring fastening II and fixes with perforated steel plate, Spiral lower end is fixed by control threaded rod nut with control bit bottom plate, and compression concrete test block is stuck in control bit top plate In the groove II of control bit bottom plate, vibrating string type strain transducer is installed on compression concrete test block.

Further, frame-type armored concrete by camber beam loading device include upper beam, lower beam, spring fastening I, on Crossbearer cover plate, jack, steel column and pressure sensor, four steel columns are in turn fixed to rigid foundation in distributed rectangular On, the top of steel column extends through upper beam and lower beam, and upper beam is arranged in parallel with two, between upper beam and steel column It is bolted, two upper beams are connected together by upper beam cover board with upper beam cover board positioning bolt, upper cross It is provided with hole among beam cover board, passes through jack in hole, jack is fixed on upper beam cover board, and lower beam is the steel of X-type Beam, the centre of lower beam are provided with lower beam mesoporous, and four fulcrums of the lower beam X-type are each passed through four steel columns, lower cross Beam and steel column are fixed by lower limit bolt, and spring fastening I and pressure sensor are installed in the bottom of jack respectively, described It is placed on the downside of pressure sensor by the armored concrete loading beam of load action.

Further, the span centre location arrangements displacement sensor of armored concrete loading beam.

Further, armored concrete loading beam spaning middle section arranges several strain transducers.

Further, during concrete compression creeps test block stand apparatus, have on control bit top plate one big with steel column size Small corresponding groove, for limiting the displacement of steel column.

Further, control bit top plate and control bit bottom board symmetry are equipped with for the groove I through spiral.

The concrete compression test block section stress and armored concrete that the present invention specifically derives are by camber beam maximum compressive stress Between relationship it is as follows:

For span centre bears the simply supported beam of load, according to stress balance condition, the external force of each support is F/ 2, the external force of each concrete test block is F/8,1=F/ of stress σ (8A) in respective cross-section;Reinforced beam spaning middle section Moment of flexure is M=FL/4, maximum stress 2=FL/4W of σ on compression area edge, thus the stress on concrete test block section with The ratio between stress at reinforced beam maximal margin is 1/ 2=W/ of σ (2AL) of σ;

In formula: F is the concentrated force that reinforced beam spaning middle section is subject to;A is the area of section of concrete compression test block; σ 1 is the stress on concrete compression test block section;σ 2 is Sectional Dimension of Reinforced Concrete Beam top edge maximum crushing stress;W is mixed for reinforcing bar The net section of solidifying soil beam section away from;L is the calculating across footpath of reinforced beam;M is the moment of flexure of reinforced beam spaning middle section.

One kind provided by the present invention can carry out the examination that concrete compression test block and armored concrete are crept by camber beam simultaneously Experiment device compared with prior art, has the advantages that

1) present invention can be achieved at the same time Ordinary Compressive Concrete test block and armored concrete and be tested by the Creep Characteristics of camber beam, Concrete compression test block and armored concrete can be controlled artificially by the stress intensity relationship between camber beam, convenient for comparing different stress The Creep Characteristics of concrete structure under state;

2) concrete compression test block is grouped together by the present invention, and the compression support as reinforced beam, combination is set Meter ensure that the stability of support loading procedure, and can guarantee each test block by more uniform pressure.The device can have Test space is saved on effect ground, achieves that two groups of concrete compressions are crept test block and one group of reinforced beam with a device It creeps load;

3) present invention needs reinforced beam to be loaded to can be simply supported beam or continuous beam, it is only necessary to convert concrete compression Test block stand apparatus of creeping and frame-type armored concrete can be met the steel of different spans by the position of camber beam loading device The Creep Characteristics of Concrete Beam Reinforced test demand;

4) apparatus of the present invention are simple, only can be achieved with a hydraulic jack to reinforced beam and concrete test block Load of creeping, corresponding structure is simple, and Path of Force Transfer is clear, promotional value with higher.Each component system of the device simultaneously It is small to make difficulty, easy for construction, cost is relatively low and safe and reliable, and the reusable value of loading device is larger.

Detailed description of the invention

Fig. 1 creeps for the concrete test block of specific embodiment and loads the schematic diagram of support;

Fig. 2 is the schematic diagram of the section B-B of Fig. 1;

Fig. 3 is single span Reinforced Concrete Simple by camber beam load schematic diagram;

Fig. 4 is loaded schematic diagram by camber beam across RC Continuous for two;

Fig. 5 is frame-type armored concrete by camber beam loading device structural schematic diagram;

Fig. 6 is the C-C schematic cross-section of Fig. 5;

Fig. 7 is the D-D schematic cross-section of Fig. 5;

The meaning of symbol is as follows in figure: 1- upper beam;2- lower beam;3- armored concrete loading beam;4- spring fastening I; 5- upper beam cover board;6- jack;7- steel column;8- lower limit bolt;9- rigid foundation;10- upper bolt;11- is pressurized Concrete test block;12- pressure sensor;13- upper beam cover board positioning bolt;14- jack positioning bolt;15- type vibration wire is answered Become sensor;16- displacement sensor;17- spring fastening II;18- perforated steel plate;19- control bit top plate;20- control bit bottom plate; 21- groove I;22- controls threaded rod nut;23- groove II;24- spiral;25- lower beam mesoporous;26- concrete compression It creeps test block stand apparatus;27- strain transducer;28- lower beam is lateral opening;29- support roller bearing;30- frame-type armored concrete By camber beam loading device.

Specific embodiment

The technical effect of design of the invention, detail and acquisition is described further with reference to the accompanying drawing.

As shown in Fig. 1-Fig. 4, the concrete compression creep test block stand apparatus 26 include compression concrete test block 11, Vibrating string type strain transducer 15, spring fastening II17, perforated steel plate 18, control bit top plate 19, control bit bottom plate 20, groove I21, Control threaded rod nut 22, groove II23, spiral 24.Before casting concrete, the vibrating string type strain transducer 15 is used Flexible Steel bar rack is bound in advance in axis direction and the compression for into die trial, guaranteeing vibrating string type strain transducer 15 after molding Concrete test block 11 is identical.The groove II23 is located at four corner locations of control bit top plate 19 and control bit bottom plate 20, institute The size for stating groove II23 is more bigger than the diameter or side length of the compression concrete test block 11, and the depth of groove II23 is about 0.2 ~ 0.3cm, based on the main compression concrete test block 11 of card.The groove 121 is located at control bit top plate 19 and control bit bottom plate 20 center, the diameter of the groove I21 are slightly larger than perforated steel plate 18, and depth can satisfy control threaded rod nut 22 Below the top surface of control bit top plate 19.The groove II23 and groove I21 slots contrary.Have in the groove I21 Several through-holes across roof and floor can run through spiral 24.The compression concrete test block 11 is stuck in control bit top plate 19 In the groove II23 of control bit bottom plate 20, spiral 24 is run through in the through-hole of groove I21, and be placed into spring fastening On II17, tightening control threaded rod nut 22 is mixed four groups by the position-limiting action of control bit top plate 19 and control bit bottom plate 20 Solidifying soil test block binding becomes an entirety.Concrete compression test block stand apparatus 26 of creeping can be used as frame-type reinforced concrete Soil by camber beam loading device 30 a support, for undertaking the support load of beams of concrete.

Shown in Fig. 5-Fig. 7, the frame-type armored concrete by camber beam loading device 30 include upper beam 1, lower beam 2, Armored concrete loading beam 3, spring fastening I4, upper beam cover board 5, hydraulic jack 6, steel column 7, lower limit bolt 8, just Property ground 9, upper bolt 10, pressure sensor 12, upper beam cover board positioning bolt 13, jack positioning bolt 14, displacement pass Sensor 16, lower beam mesoporous 25, strain transducer 27.Four steel columns 7 are in turn fixed to rigid foundation 9 in distributed rectangular On, the top of steel column 7 extends through upper beam 1 and lower beam 2, solid by bolt between the upper beam 1 and steel column 7 It is fixed, counter-force is provided for hydraulic jack.Two upper beams 1 pass through upper beam cover board 5 and upper beam cover board positioning bolt 13 It connects together, hole is provided among the upper beam cover board 5, passes through hydraulic jack 6, the hydraulic jack 6 in hole It is fixed on upper beam cover board 5 with jack positioning bolt 14.The oil circuit of the hydraulic jack 6 is connect with oil pump pipeline, is used In the load that transmitting hydraulic jack applies.The lower beam 2 is the girder steel of X-type, is provided in lower beam in the centre of lower beam 2 The top in hole 25, hydraulic jack 6 can be directly through no-load transmitting.Four fulcrums of the lower beam 2X type are each passed through Four steel columns 7 limit movement of the lower beam 2 on steel column 7 with lower limit bolt 8.The top of the hydraulic jack 6 Spring fastening I4 and pressure sensor 12 are installed respectively.The armored concrete loading beam 3 by load action is just placed on pressure 12 downside of force snesor.

Further, in the span centre location arrangements displacement sensor 16 of the armored concrete loading beam 3, for measure across The vertical displacement of middle section.Several strain transducers 27 are arranged in spaning middle section, for measuring longitudinal fiber Xu of beams of concrete Allergic effect becomes.The p-wire of the strain transducer 27 is connect with strain testing case.

Further, the hydraulic jack 6 and load armored concrete loading beam 3 between installation one rigidity compared with Big spring fastening I4, which is able to bear biggish load, but deforms smaller;And it needs on the upside of the spring fastening I4 One pressure sensor 12 is installed, with the load size being transmitted on crossbeam with measurement.

Further, it creeps in test block stand apparatus 26 in the concrete compression, needs one on control bit top plate 19 A groove corresponding with 29 size of steel column simulates the fixation of simply supported beam or continuous beam for limiting the displacement of steel column 29 Support.

Further, in order to guarantee the progress of the preferred embodiment, it is ensured that the compression concrete test block 11 poured pushes up The flatness of bottom surface.Concreting is completed and is placed under standard laboratory conditions after the completion of maintenance, needs to be existed with sander Top bottom surface carries out grinding process.

Further, the frame-type armored concrete should be had by the upper beam 1 and lower beam 2 of camber beam loading device 30 Biggish rigidity can resist the counter-force effect of biggish beams of concrete.Compared with beams of concrete, the deformation of the buckstay can be neglected Slightly disregard.

Fig. 3 and Fig. 4 respectively schematically gives the loading device being specifically applied on concrete simply supported beam and continuous beam, The present invention can also the reinforced beam to different spans and different loads carry out load of creeping.

The vibrating string type strain transducer 15 being embedded into compression concrete test block 11 is connected to by strain testing case On computer, computer test system can Timing measurement its strain value.If beams of concrete arranged along depth of beam direction along bridge to Dry strain transducer 27, the strain for measuring reinforced beam change with time relationship.16 cloth of institute's displacement sensors Reinforced beam spaning middle section is set, for testing the vertical displacement on spaning middle section.

The present invention in a particular embodiment the step of it is as follows:

1) in template, triangular reinforced bar bracket is installed, is in axial direction evenly arranged in the middle part of each concrete test block Three vibrating string type strain transducers, concrete test block size is according to the size of reinforced beam and hydraulic in the present embodiment The capacity of water of jack bearing load determines, is conserved under the conditions of being placed into after casting concrete suitably, can after demoulding Obtain the concrete creep test block of test.

2) by every four groups of compositions, one support of concrete test block, control bit top plate 19 and control bit bottom plate 20 are stuck in In card slot, the reserving hole at middle part runs through spiral 24, and tightening control threaded rod nut 22, forms stand apparatus.This The test specimen that every group of concrete test block of secondary load can be made of different ratio or admixture, can also be by the coagulation of different curing ages Native test block composition.

3) armored concrete with jack is placed into simply supported beam or continuous beam needs by camber beam Creep Loading Equipment Amesdial 16 and strain transducer 27 are installed in girder span middle section in the position of load.Start hydraulic jack, reinforced beam It will receive biggish vertical load, and generate certain deformation, according to the reading of pressure sensor 12, when reaching design requirement When, stop load, and tightening control threaded rod nut 22, the power of hydraulic jack 6 can be transformed into lower beam 2 at this time On.

4) load front and back, records vibrating string type strain transducer 15, the reading on strain transducer 27 and amesdial 16, and with Time change successively records the not displacement of same date and strain value.Stress result on observed pressure sensor 12, if numerical value is small In the 5% of design load, start hydraulic jack, increase load, while continuing tightening control threaded rod nut 22, keeps applying Load on to beams of concrete is constant.

Specific embodiments of the present invention, although using plain concrete test block as the main of reinforced beam stand apparatus Component, but it is also not limited to plain concrete, it is equally applicable for the concrete filled steel tube test block with same shape size.

Above-described is only preferred embodiment of the invention.For those of ordinary skill in the art, In Under the premise of not departing from the invention design, several modifications and improvements can be made without creative work, these all belong to In protection scope of the present invention.

Claims (6)

1. a kind of new concrete compression column and armored concrete are by camber beam creep test device, it is characterised in that: including reinforcing bar Creep test block stand apparatus (26) and frame-type armored concrete of concrete loading beam (3), concrete compression is loaded by camber beam and is filled Set (30), armored concrete loading beam (3) by support roller bearing (29) be mounted on several concrete compressions creep test block support dress It sets on the upside of (26), it is described equipped with frame-type armored concrete by camber beam loading device (30) in the middle part of armored concrete loading beam (3) Concrete compression test block stand apparatus (26) of creeping includes compression concrete test block (11), vibrating string type strain transducer (15), bullet Spring support II(17), perforated steel plate (18), control bit top plate (19), control bit bottom plate (20), control threaded rod nut (22) and Spiral (24) is connected with spiral (24), spiral between control bit top plate (19) and control bit bottom plate (20) (24) upper end passes through spring fastening II(17) it is fixed with perforated steel plate (18), spiral (24) lower end passes through control threaded rod spiral shell Cap (22) and control bit bottom plate (20) are fixed, and compression concrete test block (11) is stuck in control bit top plate (19) and control bit bottom plate (20) groove II(23) in, vibrating string type strain transducer (15) are installed on compression concrete test block (11).
2. new concrete compression column according to claim 1 and armored concrete are by camber beam creep test device, special Sign is: the frame-type armored concrete is included upper beam (1), lower beam (2), spring fastening by camber beam loading device (30) I(4), upper beam cover board (5), jack (6), steel column (7) and pressure sensor (12), four steel columns (7) are in rectangle point Cloth is in turn fixed on rigid foundation (9), and the top of steel column (7) extends through upper beam (1) and lower beam (2), upper beam (1) two are arranged in parallel with, is bolted between upper beam (1) and steel column (7), two upper beams (1) pass through Upper beam cover board (5) is connected together with upper beam cover board positioning bolt (13), is provided with hole, hole among upper beam cover board (5) Jack (6) are passed through in hole, jack (6) is fixed on upper beam cover board (5), and lower beam (2) is the girder steel of X-type, lower beam (2) centre is provided with lower beam mesoporous (25), and four fulcrums of lower beam (2) X-type are each passed through four steel columns (7), Lower beam (2) and steel column (7) are fixed by lower limit bolt (8), and spring fastening I is installed in the bottom of jack (6) respectively (4) and pressure sensor (12) it, is placed on the downside of pressure sensor (12) by the armored concrete loading beam (3) of load action.
3. new concrete compression column according to claim 2 and armored concrete are by camber beam creep test device, special Sign is: the span centre location arrangements displacement sensor (16) of the armored concrete loading beam (3).
4. new concrete compression column according to claim 3 and armored concrete are by camber beam creep test device, special Sign is: armored concrete loading beam (3) spaning middle section arranges several strain transducers (27).
5. new concrete compression column according to claim 1 or 4 and armored concrete is by camber beam creep test device, Be characterized in that: the concrete compression is crept in test block stand apparatus (26), has one to roll on control bit top plate (19) with support The corresponding groove of axis (29) size, for limiting the displacement of support roller bearing (29).
6. new concrete compression column according to claim 5 and armored concrete are by camber beam creep test device, special Sign is: the control bit top plate (19) and control bit bottom plate (20) is symmetrically arranged with for the groove through spiral (24) I(21).
CN201710942625.3A 2017-10-11 2017-10-11 New concrete compression column and armored concrete are by camber beam creep test device CN107870126B (en)

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Publication number Priority date Publication date Assignee Title
CN103234902A (en) * 2013-04-23 2013-08-07 金陵科技学院 Device and method for testing adhesive property between fiber reinforce plastic (FRP) rib and concrete under complicated stress state
CN103698221A (en) * 2013-12-19 2014-04-02 上海华龙测试仪器股份有限公司 Bending toughness tester for fiber reinforced concrete
CN204027929U (en) * 2014-08-12 2014-12-17 内蒙古工业大学 Concrete creep instrument
CN104729930A (en) * 2015-04-10 2015-06-24 郑州大学 Concrete flexural strength tester
CN105890995A (en) * 2016-02-25 2016-08-24 大连理工大学 High-strength concrete pressure-bearing creep test system
KR20160100566A (en) * 2015-02-16 2016-08-24 금오공과대학교 산학협력단 A manual bending test machine
CN106644692A (en) * 2016-12-15 2017-05-10 大连理工大学 Test device for determining creep of concrete
JP2017142108A (en) * 2016-02-09 2017-08-17 野口 義隆 Specimen type frame for concrete bending strength test

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103234902A (en) * 2013-04-23 2013-08-07 金陵科技学院 Device and method for testing adhesive property between fiber reinforce plastic (FRP) rib and concrete under complicated stress state
CN103698221A (en) * 2013-12-19 2014-04-02 上海华龙测试仪器股份有限公司 Bending toughness tester for fiber reinforced concrete
CN204027929U (en) * 2014-08-12 2014-12-17 内蒙古工业大学 Concrete creep instrument
KR20160100566A (en) * 2015-02-16 2016-08-24 금오공과대학교 산학협력단 A manual bending test machine
CN104729930A (en) * 2015-04-10 2015-06-24 郑州大学 Concrete flexural strength tester
JP2017142108A (en) * 2016-02-09 2017-08-17 野口 義隆 Specimen type frame for concrete bending strength test
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CN106644692A (en) * 2016-12-15 2017-05-10 大连理工大学 Test device for determining creep of concrete

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