CN107870126A - 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
CN107870126A
CN107870126A CN201710942625.3A CN201710942625A CN107870126A CN 107870126 A CN107870126 A CN 107870126A CN 201710942625 A CN201710942625 A CN 201710942625A CN 107870126 A CN107870126 A CN 107870126A
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CN
China
Prior art keywords
concrete
loading
camber
armored concrete
compression
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CN201710942625.3A
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Chinese (zh)
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CN107870126B (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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Publication of CN107870126A publication Critical patent/CN107870126A/en
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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.Solves the problems, such as individually to carry out concrete compression test block creep test and armored concrete under existing laboratory environment condition by space during camber beam creep test and loading efficiency, 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 crept on the upside of test block stand apparatus by bearing roller bearing installed in some concrete compressions, and frame-type armored concrete is provided with the middle part of armored concrete loading beam by camber beam loading device.Each part manufacture difficulty of the present invention is small, and easy for construction, cost is relatively low and safe and reliable, and it is larger that loading device repeats value.

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, specifically one kind can be entered simultaneously The creep test device of the test block of row concrete compression and armored concrete by camber beam.

Background technology

Concrete is as a kind of plasticity height, the preferable material of overall economic efficiency, in present building trade, particularly bridge Relatively broad application has been obtained in girder construction.However, influenceed by concrete material shrinkage and creep, long span concrete bridge Structure will produce larger deformation, and then significantly affect the performance of structure, particularly the operation security of high-speed railway bridge Property.In bridge structure in addition to the concrete structures such as pier stud are based on being pressurized, girder construction is primarily subjected to bending stress, and difference should Significant difference be present in the concrete creep performance under power state.Therefore, by creep test device reasonable in design, and then inquire into The creep property of Cemented of different stresses, for the long term deformation behaviour of Accurate Prediction bridge structure, solve at present to big The problem of span bridge's TERM DEFORMATION forecasting inaccuracy is true has great theory and practice meaning.

Scholars have carried out substantial amounts 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 models.The it is proposed of above-mentioned model is defined 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 drew, the less concrete creep result of the test with reference to bending component.In recent years, more scholar has also progressively carried out coagulation The Creep Characteristics testing research of soil or reinforced beam, and concrete compression test block is compared for armored concrete by camber beam Xu Become the difference of performance.But conventional research is to being tested using two kinds of devices the creeping property of different primary structure members mostly , such as lever, spring, spring lever formula or fluid pressure type loading device are used to concrete compression test block, reinforcing bar is mixed Solidifying soil is used counter weight type or hydraulic jack formula loading device mostly by camber beam.Using different loading devices to concrete test block , it is necessary to the more hydraulic jack of larger working space and number, the concrete of different stresses when carrying out creep test Stress relation is difficult to control, and loading device is various, is spent larger.This will certainly cause larger man power and material to waste, and The comparative study of concrete component Creep Characteristics in different stresses is also a greater impact.There has been no one kind at present to try Experiment device can carry out concrete compression test block and armored concrete simultaneously and be crept test by camber beam.

The content of the invention

The purpose of invention is crept examination to solve under existing laboratory environment condition individually to carry out concrete compression test block Test with armored concrete by space during camber beam creep test and loading efficiency problem, there is provided 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 crept in test block stand apparatus by bearing roller bearing installed in some concrete compressions Side, armored concrete loading beam middle part are provided with frame-type armored concrete by camber beam loading device.

Further, concrete compression is crept, and test block stand apparatus includes compression concrete test block, vibrating string type strain senses 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 is fixed through spring fastening II with perforated steel plate, Spiral lower end is provided with by controlling threaded rod nut to be fixed with control bit bottom plate, between top steel plate and lower steel plate and is pressurized Concrete test block, vibrating string type strain transducer is installed on compression concrete test block.

Further, frame-type armored concrete by camber beam loading device include entablature, sill, spring fastening I, on Crossbearer cover plate, jack, steel column and pressure sensor, the rectangular distribution of four steel columns are in turn fixed to rigid foundation On, the top of steel column extends through entablature and sill, and entablature is arranged with two, between entablature and steel column in parallel It is bolted, two entablatures are connected together by entablature cover plate with entablature cover plate bolt, upper horizontal stroke Hole is provided among beam cover plate, jack is passed through in hole, jack is fixed on entablature cover plate, and sill is the steel of X-type Beam, the centre of sill are provided with sill mesopore, and four fulcrums of the sill X-type are each passed through four steel columns, lower horizontal stroke 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 by the armored concrete loading beam of load action on the downside of pressure sensor.

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

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

Further, during concrete compression creeps test block stand apparatus, one is provided with control bit top plate and is rolled with bearing The corresponding groove II of shaft size size.

Further, control bit top plate is provided with the groove I for being used for blocking compression concrete test block with control bit bottom board symmetry.

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

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

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 Stress on concrete compression test block section;σ 2 is Sectional Dimension of Reinforced Concrete Beam top edge maximum crushing stress;W is armored concrete The net section of 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.

A kind of examination that can be carried out concrete compression test block simultaneously and be crept with armored concrete by camber beam provided by the present invention Experiment device compared with prior art, has the advantages that:

1)The present invention can realize that Ordinary Compressive Concrete test block and armored concrete are tested by the Creep Characteristics of camber beam simultaneously, coagulation The stress intensity relation of native compression test block and armored concrete between by camber beam can manual control, be easy to contrast different stresses Under concrete structure Creep Characteristics;

2)Concrete compression test block is grouped together by the present invention, the compression bearing as reinforced beam, and Combination Design is protected The stability of bearing loading procedure has been demonstrate,proved, and can guarantee that each test block by more uniform pressure.The device can be effectively Test space is saved, achieves that two groups of concrete compressions are crept the creeping of test block and one group of reinforced beam with a device Loading;

3)The reinforced beam that the present invention needs to load can be simply supported beam or continuous beam, it is only necessary to convert concrete compression and creep Test block stand apparatus and frame-type armored concrete can be met that the reinforcing bar of different spans mixes by the position of camber beam loading device Solidifying Tu Liang Creep Characteristics experiment demand;

4)Apparatus of the present invention are simple, and Xu to reinforced beam and concrete test block is only can be achieved with a hydraulic jack Become loading, corresponding simple in construction, Path of Force Transfer is clear and definite, has higher promotional value.Each part manufacture of the device simultaneously is difficult Spend small, easy for construction, cost is relatively low and safe and reliable, and it is larger that loading device repeats value.

Brief description of the drawings

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

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

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

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

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

Fig. 6 is Fig. 5 C-C schematic cross-sections;

Fig. 7 is Fig. 5 D-D schematic cross-sections;

The implication of symbol is as follows in figure:1- entablatures;2- sills;3- armored concrete loading beams;4- spring fastenings I;On 5- Crossbearer cover plate;6- jack;7- steel columns;8- lower limit bolts;9- rigid foundations;10- upper bolts;11- compression coagulations Native test block;12- pressure sensors;13- entablature cover plate bolts;14- jack bolts;15- vibrating string type strains pass Sensor;16- displacement transducers;17- spring fastenings II;18- perforated steel plates;19- control bit top plates;20- control bit bottom plates;21- Groove I;22- controls threaded rod nut;23- grooves II;24- spirals;25- sill mesopores;26- concrete compressions are crept Test block stand apparatus;27- strain transducers;28- sills are lateral opening;29- bearing roller bearings;30- frame-type armored concrete is by curved Beam loading device.

Embodiment

The technique effect of the design to the present invention, detail and acquisition is described further below in conjunction with the accompanying drawings.

As shown in Fig. 1-Fig. 4, concrete compression test block stand apparatus 26 of creeping includes 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 The flexible advance colligation of Steel bar rack into die trial, is ensureing the axis direction of the vibrating string type strain transducer 15 after shaping and compression 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 State that groove II23 size is more bigger than the diameter or the length of side of the compression concrete test block 11, and groove II23 depth 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 its depth disclosure satisfy that control threaded rod nut 22 Below the top surface of control bit top plate 19.The groove II23 and groove I21 slot in opposite direction.Have in the groove I21 Some through holes through roof and floor, spiral 24 can be run through.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 groove I21 through hole, and be placed into spring fastening On II17, tightening control threaded rod nut 22, four groups are mixed by the position-limiting action of control bit top plate 19 and control bit bottom plate 20 Solidifying native test block binding turns into an entirety.Concrete compression test block stand apparatus 26 of creeping can be used as frame-type reinforced concrete A native bearing by camber beam loading device 30, for undertaking the bearing load of beams of concrete.

Shown in Fig. 5-Fig. 7, the frame-type armored concrete is included entablature 1 by camber beam loading device 30, sill 2, Armored concrete loading beam 3, spring fastening I4, entablature cover plate 5, hydraulic jack 6, steel column 7, lower limit bolt 8, just Property ground 9, upper bolt 10, pressure sensor 12, entablature cover plate bolt 13, jack bolt 14, displacement pass Sensor 16, sill mesopore 25, strain transducer 27.The rectangular distribution of four steel columns 7 is in turn fixed to rigid foundation 9 On, the top of steel column 7 extends through entablature 1 and sill 2, is consolidated between the entablature 1 and steel column 7 by bolt It is fixed, provide counter-force for hydraulic jack.Two entablatures 1 pass through entablature cover plate 5 and entablature cover plate bolt 13 Connect together, hole is provided among the entablature cover plate 5, hydraulic jack 6, the hydraulic jack 6 are passed through in hole It is fixed to jack bolt 14 on entablature cover plate 5.The oil circuit of the hydraulic jack 6 is connected with oil pump pipeline, is used In the load for transmitting hydraulic jack application.The sill 2 is the girder steel of X-type, is provided with the centre of sill 2 in sill Hole 25, the top of hydraulic jack 6 can be directly through no-load transmission.Four fulcrums of the sill 2X types are each passed through Four steel columns 7, movement of the sill 2 on steel column 7 is limited 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 The downside of force snesor 12.

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

Further, the hydraulic jack 6 and loading armored concrete loading beam 3 between install a rigidity compared with Big spring fastening I4, the bearing can bear larger load, but deform smaller;And need on the upside of the spring fastening I4 One pressure sensor 12 is installed, with the load size being delivered to measurement on crossbeam.

Further, in the concrete compression creeps test block stand apparatus 26, one is needed on control bit top plate 19 The individual groove corresponding with the size of steel column 29, for limiting the displacement of steel column 29, simulate the fixation of simply supported beam or continuous beam Bearing.

Further, in order to ensure 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, it is necessary to be existed with sander Top bottom surface carries out grinding process.

Further, the frame-type armored concrete should be had by the entablature 1 and sill 2 of camber beam loading device 30 Larger rigidity, the counter-force effect of larger beams of concrete can be resisted.Compared with beams of concrete, the deformation of the buckstay can neglect Slightly disregard.

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

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 relation.The cloth of institute's displacement sensors 16 Reinforced beam spaning middle section is put, 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 support is installed, three are in axial direction evenly arranged in the middle part of each concrete test block Vibrating string type strain transducer, concrete test block size is according to the size and hydraulic jack of reinforced beam in the present embodiment The capacity of water for pushing up bearing load determines, is conserved under the conditions of being placed into after casting concrete suitably, can be obtained after form removal The concrete creep test block of experiment.

2)By every four groups of compositions, one bearing of concrete test block, control bit top plate 19 and control bit bottom plate 20 are stuck in In neck, 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 loading can be made up of different ratio or admixture, also can 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 The position of loading, amesdial 16 and strain transducer 27 are installed in girder span middle section.Start hydraulic jack, reinforced beam And certain deformation can be produced by larger vertical load, according to the reading of pressure sensor 12, when reaching design requirement When, stop loading, and tightening control threaded rod nut 22, now the power of hydraulic jack 6 is transformed into sill 2 by can On.

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

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

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

Claims (7)

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 Concrete loading beam(3), concrete compression creeps test block stand apparatus(26)Loaded and filled by camber beam with frame-type armored concrete Put(30), armored concrete loading beam(3)Pass through bearing roller bearing(29)Installed in some concrete compressions creep test block bearing dress Put(26)Upside, armored concrete loading beam(3)Middle part is provided with frame-type armored concrete by camber beam loading device(30).
2. by camber beam creep test device, it is special for new concrete compression column according to claim 1 and armored concrete Sign is:The concrete compression is crept test block stand apparatus(26)Including compression concrete test block(11), vibrating string type strain pass Sensor(15), spring fastening II(17), perforated steel plate(18), control bit top plate(19), control bit bottom plate(20), control threaded rod Nut(22)And spiral(24), control bit top plate(19)With control bit bottom plate(20)Between be connected with spiral(24), Spiral(24)Upper end passes through spring fastening II(17)With perforated steel plate(18)It is fixed, spiral(24)Lower end passes through control Threaded rod nut(22)With control bit bottom plate(20)It is fixed, top steel plate(23)With lower steel plate(24)Between be provided with compression coagulation Native test block(11), compression concrete test block(11)On vibrating string type strain transducer is installed(15).
3. new concrete compression column according to claim 1 or 2 and armored concrete is by camber beam creep test device, its It is characterised by:The frame-type armored concrete is by camber beam loading device(30)Including entablature(1), sill(2), spring branch Seat I(4), entablature cover plate(5), jack(6), steel column(7)And pressure sensor(12), four steel columns(7)It is in Distributed rectangular is in turn fixed to rigid foundation(9)On, steel column(7)Top extend through entablature(1)And sill(2), Entablature(1)It is arranged with two in parallel, entablature(1)With steel column(7)Between be bolted, two entablatures (1)Pass through entablature cover plate(5)With entablature cover plate bolt(13)Connect together, entablature cover plate(5)Centre is provided with Hole, jack is passed through in hole(6), jack(6)It is fixed on entablature cover plate(5)On, sill(2)For the girder steel of X-type, Sill(2)Centre be provided with sill mesopore(25), the sill(2)Four fulcrums of X-type are each passed through four steel and stood Post(7), sill(2)And steel column(7)Pass through lower limit bolt(8)It is fixed, jack(6)Bottom spring is installed respectively Bearing I(4)And pressure sensor(12), the armored concrete loading beam by load action(3)It is placed on pressure sensor (12)Downside.
4. by camber beam creep test device, it is special for new concrete compression column according to claim 3 and armored concrete Sign is:The armored concrete loading beam(3)Span centre location arrangements displacement transducer(16).
5. by camber beam creep test device, it is special for new concrete compression column according to claim 4 and armored concrete Sign is:The armored concrete loading beam(3)Spaning middle section arranges some strain transducers(27).
6. new concrete compression column and armored concrete according to claim 2 or 5 be by camber beam creep test device, its It is characterised by:The concrete compression is crept test block stand apparatus(26)In, control bit top plate(19)On be provided with one with branch Seat roller bearing(29)The corresponding groove II of size(23).
7. by camber beam creep test device, it is special for new concrete compression column according to claim 6 and armored concrete Sign is:Described control bit top plate(19)With control bit bottom plate(20)It is arranged with for blocking compression concrete test block(11) Groove 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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* 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
CN104729930A (en) * 2015-04-10 2015-06-24 郑州大学 Concrete flexural strength tester
KR20160100566A (en) * 2015-02-16 2016-08-24 금오공과대학교 산학협력단 A manual bending test machine
CN105890995A (en) * 2016-02-25 2016-08-24 大连理工大学 High-strength concrete pressure-bearing creep test system
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
CN105890995A (en) * 2016-02-25 2016-08-24 大连理工大学 High-strength concrete pressure-bearing creep test system
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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