CN102749439B - Test and evaluation device for segregation of fresh concrete - Google Patents
Test and evaluation device for segregation of fresh concrete Download PDFInfo
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- CN102749439B CN102749439B CN201210227407.9A CN201210227407A CN102749439B CN 102749439 B CN102749439 B CN 102749439B CN 201210227407 A CN201210227407 A CN 201210227407A CN 102749439 B CN102749439 B CN 102749439B
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Abstract
The invention discloses a test and evaluation device for segregation of fresh concrete. The device comprises a vibration component and a testing component. The vibration component comprises a base, a counterweight chamber is provided on the base, an engine chamber is fixed at the upper end of the counterweight chamber, an engine is arranged in the engine chamber and a vibration table connected with the engine is arranged at the upper part of the engine chamber; the testing component is fixed on the vibration table and comprises an upper material containing chamber and a lower material containing chamber, which are communicated with each other, a disc is arranged between the lower material containing chamber and the upper material containing chamber and connected with the upper material containing chamber and the lower material containing chamber through a rotating shaft, and a circular hole is arranged in the disc. The device can test and evaluate segregation conditions of fresh concrete and can effectively prevent damage resulting from segregation of concrete.
Description
Technical field
The invention belongs to civil engineering work technical field of concrete construction, relate to a kind of test and evaluation device, especially a kind of fresh concrete segregation phenomenon test and evaluation device.This device is used for test and emanates situation with evaluation fresh concrete, and the harm that can effectively prevent concrete disintegration to bring, provides reliable experimental data.
Background technology
Concrete segregation is that the cohesive strength between concrete mix composition material is not enough to the sinking of opposing coarse aggregate, and concrete mix composition is separated from each other, and causes the phenomenon that inner the Nomenclature Composition and Structure of Complexes is uneven.Be usually expressed as coarse aggregate and mortar is separated from each other, the bottom of the large mixture of particle deposition that such as density is large, or coarse aggregate from mixture, overall separation is out.
Concrete disintegration affects concrete workability, causes sticky tank, plugging, affects the duration etc., reduces economic benefit.Affecting the apparent effect of xoncrete structure, there is the phenomenons such as sand streak, aggregate exposure, reinforcing steel bars exposed in concrete surface.Concrete strength is significantly declined, and have a strong impact on xoncrete structure carrying cage power, destroy the security performance of structure, serious causing is done over again, and causes huge economic loss.Concrete homogeneity is poor, causes the contraction at each position of concrete inconsistent, easily produces concrete shrinkage crack.Particularly when constructing concrete floor, because concrete disintegration makes the grout layer on top layer thicken, shrinking and sharply increasing, occurring serious cracking phenomenon.Significantly reduce the concrete endurance qualities such as concrete impervious, freeze proof.
At present, method general is both at home and abroad slump method and the vigorous denseness method of dimension, and slump method indirectly reflects the concrete education resistance energy of reaction, for fresh cement concrete, because slump is not suitable for more greatly using slump method by cohesiveness.And tie up the distribution situation that vigorous denseness method directly can not react concrete inner aggregate after jolt ramming.The present invention is directed to fresh concrete segregation, directly can reflect concrete segregation level objectively, there is very high practical value.
Summary of the invention
The object of the invention is to the shortcoming overcoming above-mentioned prior art, provide a kind of fresh concrete segregation phenomenon to test and evaluation device, this device can be tested and evaluate fresh concrete and to emanate situation, the harm that can effectively prevent concrete disintegration to bring.
The object of the invention is to solve by the following technical programs:
This fresh concrete segregation phenomenon test and evaluation device, involving vibrations parts and test parts, described vibrating mass comprises base, and base is provided with counterweight room; Be fixed with engine room in the upper end of counterweight room, engine is set in engine room; The top of described engine room is provided with the shaking table be connected with engine; Described test parts is fixing on a vibration table; Described test parts comprises the upper material-containing chamber and lower material-containing chamber that communicate up and down, is provided with disk, and is connected by rotating shaft between upper material-containing chamber and lower material-containing chamber between described lower material-containing chamber and upper material-containing chamber; Described disk offers circular hole.
Above-mentioned counterweight room is cylindrical shape, and inside is provided with iron block.
Above-mentioned engine room is cylindrical shape.
Above-mentioned upper material-containing chamber and lower material-containing chamber are cylindrical barrel; The lower end of described lower material-containing chamber is fixed on iron prop, is fixed between described iron prop lower end and shaking table by attraction.
Above-mentioned disk offers center hole in center, and the diameter of described center hole is identical with the internal diameter of lower material-containing chamber with upper material-containing chamber; Also offer another circular hole at the center hole side of disk, two circular holes are directly provided with the mounting hole that described rotating shaft can be made to pass.
Further, the center hole of disk is provided with rubber washer.
Be provided with fixing lock between above-mentioned upper material-containing chamber and lower material-containing chamber, the central shaft of described fixing lock upper material-containing chamber relative to rotating shaft or lower material-containing chamber is symmetrical arranged.
The upper end of above-mentioned upper material-containing chamber is provided with charging aperture.
Further, in preferred plan of the present invention, the barrel bore of upper material-containing chamber and lower material-containing chamber is 75mm, and external diameter 80mm, is highly 150mm; Disc radius 265mm, circle hole radius 75mm on disk.
The technology of the present invention is improved further and is with feature:
1, the present invention can reasonably simulate fresh concrete vibrate after the lamination of aggregate and thin pulp in concrete.
2, the present invention can evaluate fresh concrete segregation situation objectively.So that revise concrete mix early, reduce the harm of emanating and bringing.
3, apparatus structure of the present invention is simple, and easy to operate, energy resource consumption is few, good economy performance, and practical value is high.
Accompanying drawing explanation
Fig. 1 is sectional view of the present invention;
Fig. 2 is the vertical view of disk 4 in the present invention.
Wherein: 1 is charging aperture; 2 is upper material-containing chamber; 3 is rotating shaft; 4 is disk; 5 is lower material-containing chamber; 6 is iron prop; 7 is shaking table; 8 is magnet; 9 is engine room; 10 is counterweight room; 11 is base; 12 is rubber washer.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail:
See Fig. 1, fresh concrete segregation phenomenon test of the present invention and evaluation device, involving vibrations parts and test parts.Wherein vibrating mass comprises base 11, is provided with counterweight room 10 on the pedestal 11; Be fixed with engine room 9 in the upper end of counterweight room 10, engine is set in engine room 9; The top of engine room 9 is provided with the shaking table 7 be connected with engine; Test parts is fixed on shaking table 7; Test parts comprises the upper material-containing chamber 2 and lower material-containing chamber 5 that communicate up and down, is provided with disk 4, and is connected by rotating shaft 3 between upper material-containing chamber 2 and lower material-containing chamber 5 between lower material-containing chamber 5 and upper material-containing chamber 2; Disk 4 offers circular hole (as Fig. 2).Described counterweight room 10 and engine room 9 are cylindrical shape, and inside, counterweight room 10 is provided with iron block.
Upper material-containing chamber 2 of the present invention and lower material-containing chamber 5 are cylindrical barrel; The lower end of lower material-containing chamber 5 is fixed on iron prop 6, is attracted fixing between iron prop 6 lower end and shaking table 7 by magnet 8.
See Fig. 2, disk 4 offers center hole in center, and the diameter of described center hole is identical with the internal diameter of lower material-containing chamber 5 with upper material-containing chamber 2; Also offer another circular hole at the center hole side of disk 4, two circular holes are directly provided with the mounting hole that described rotating shaft 3 can be made to pass.The center hole of disk 4 is provided with rubber washer 12.
Be provided with fixing lock 13 between described upper material-containing chamber 2 and lower material-containing chamber 5, the central shaft of fixing lock 13 upper material-containing chamber 2 relative to rotating shaft 3 or lower material-containing chamber 5 is symmetrical arranged.The upper end of upper material-containing chamber 2 is provided with charging aperture 1.
The engine arranged in engine room 9 of the present invention, its effect drives the shaking table 7 on its top to vibrate.
Magnet 8, its effect attracts the iron prop 6 bottom test parts, fixation test parts.
Shaking table 7, makes the vibrations of test parts entirety when its effect is test.
Iron prop 6, it is cylindrical shape, just in time can embed in shaking table 7, attract each other with magnet 8, makes two parts be linked to be entirety.
Lower material-containing chamber 5 of the present invention, upper material-containing chamber 2, disk 4, its effect can be held by it when upper material-containing chamber 2 rotates, and upper material-containing chamber 2 concrete from the circular hole discharge disk 4, rotating shaft 3, its effect Shi Shishang material-containing chamber 2 can move up and down around it, charging aperture 1, the concrete mixed enters material-containing chamber, rubber washer 12 by charging aperture 1, be clipped between upper and lower material-containing chamber, its effect be prevent concrete mortar from flowing out from the gap between upper and lower material-containing chamber, fix lock 13, its effect is fixed together at upper and lower material-containing chamber.
In most preferred embodiment of the present invention, upper material-containing chamber 2 is 75mm with the barrel bore of lower material-containing chamber 5, and external diameter 80mm, is highly 150mm; Disk 4 radius 265mm, circle hole radius 75mm on disk.
Fresh concrete segregation phenomenon test of the present invention is as follows with the course of work of evaluation device:
(1) the fixing lock 13 between upper material-containing chamber 2 and lower material-containing chamber 5 is locked, weigh the quality of test parts, then top test parts is vertically placed on smooth ground.
(2) upper material-containing chamber 2 is contained with lower material-containing chamber 5 from charging aperture 1 equably by careful for the concrete to be tested mixed.Both hands are micro-lifts test parts, under carefully gently knocking 2-3 on ground, eliminates the macropore in concrete.Reduce test error.And make TOC concordant with charging aperture 1 bottom.
(3) test parts is carefully put on vibrating mass.Notice that vibrating mass must be placed on level ground.
(4) start vibrating mass, make shaking platform 7 up-down vibration, and motoring ring test parts up-down vibration.
(5) stop vibration after vibrating 10s, measure the height of upper material-containing chamber 2 top without that fraction cylinder concrete with ruler rapidly, thus obtain the concrete height of material-containing chamber 2.Aforesaid operations need complete in 10s.
(6) open rapidly fixing lock 13, micro-ly carry on material-containing chamber 2 lower right corner, until upper material-containing chamber 2 can rotate centered by rotating shaft 3.Upper material-containing chamber 2 is rotated 180 °, receives the concrete flowed out from disk 4 left end circular hole with tube for feed.
(7) take off test parts, weigh the quality of now test parts, obtain the concrete quality of lower material-containing chamber 5, calculate the concrete density p of lower material-containing chamber 5 thus
1.
(8) the concrete quality of material-containing chamber 2 in weighing, calculates the concrete density p of material-containing chamber 2
2.
(9) concrete disintegration coefficient I=ρ is calculated
1/ ρ
2.The value of I is larger illustrates that the fresh concrete segregation possibility of preparation is larger.
Claims (6)
1. the test of fresh concrete segregation phenomenon and an evaluation device, it is characterized in that, involving vibrations parts and test parts, described vibrating mass comprises base (11), and base (11) is provided with counterweight room (10); Be fixed with engine room (9) in the upper end of counterweight room (10), engine is set in engine room (9); The top of described engine room (9) is provided with the shaking table (7) be connected with engine; Described test parts is fixed on shaking table (7); Described test parts comprises the upper material-containing chamber (2) and lower material-containing chamber (5) that communicate up and down, be provided with disk (4) between described lower material-containing chamber (5) and upper material-containing chamber (2), and connected by rotating shaft (3) between upper material-containing chamber (2) and lower material-containing chamber (5); (4) offer circular hole with described disk; Described disk (4) offers center hole in center, and the diameter of described center hole is identical with the internal diameter of lower material-containing chamber (5) with upper material-containing chamber (2); Also offer another circular hole at the center hole side of disk (4), two circular holes are directly provided with the mounting hole that described rotating shaft (3) can be made to pass; The center hole of disk (4) is provided with rubber washer (12); Be provided with fixing lock (13) between described upper material-containing chamber (2) and lower material-containing chamber (5), the central shaft of described fixing lock (13) upper material-containing chamber (2) relative to rotating shaft (3) or lower material-containing chamber (5) is symmetrical arranged; Described fresh concrete segregation phenomenon test is as follows with the course of work of evaluation device:
1) the fixing lock (13) between upper material-containing chamber (2) and lower material-containing chamber (5) is locked, weigh the quality of test parts, then top test parts is vertically placed on smooth ground;
2) upper material-containing chamber (2) is contained with lower material-containing chamber (5) from charging aperture (1) equably by careful for the concrete to be tested mixed; Both hands are micro-lifts test parts, under carefully gently knocking 2-3 on ground, eliminates the macropore in concrete, reduces test error, and make TOC concordant with charging aperture (1) bottom;
3) test parts is put on vibrating mass; Vibrating mass must be placed on level ground;
4) start vibrating mass, make shaking platform (7) up-down vibration, and motoring ring test parts up-down vibration;
5) stop vibration after vibrating 10s, measure the height of upper material-containing chamber (2) top without that fraction cylinder concrete with ruler rapidly, thus obtain material-containing chamber (2) concrete height; Aforesaid operations need complete in 10s;
6) open rapidly fixing lock (13), micro-ly carry on material-containing chamber (2) lower right corner, until upper material-containing chamber (2) can rotate centered by rotating shaft (3); Upper material-containing chamber (2) is rotated 180 °, receives the concrete flowed out from disk (4) left end circular hole with tube for feed;
7) take off test parts, weigh the quality of now test parts, obtain lower material-containing chamber (5) concrete quality, calculate lower material-containing chamber (5) concrete density p thus
1;
8) material-containing chamber (2) concrete quality in weighing, calculates material-containing chamber (2) concrete density p
2;
9) concrete disintegration coefficient I=ρ is calculated
1/ ρ
2; The value of I is larger illustrates that the fresh concrete segregation possibility of preparation is larger.
2. fresh concrete segregation phenomenon test according to claim 1 and evaluation device, it is characterized in that, described counterweight room (10) is cylindrical shape, and inside is provided with iron block.
3. fresh concrete segregation phenomenon test according to claim 1 and evaluation device, it is characterized in that, described engine room (9) is cylindrical shape.
4. fresh concrete segregation phenomenon test according to claim 1 and evaluation device, it is characterized in that, described upper material-containing chamber (2) and lower material-containing chamber (5) are cylindrical barrel; The lower end of described lower material-containing chamber (5) is fixed on iron prop (6), is attracted fixing between described iron prop (6) lower end and shaking table (7) by magnet (8).
5. fresh concrete segregation phenomenon test according to claim 1 and evaluation device, it is characterized in that, the upper end of described upper material-containing chamber (2) is provided with charging aperture (1).
6. fresh concrete segregation phenomenon test according to claim 1 and evaluation device, it is characterized in that, described upper material-containing chamber (2) is 75mm with the barrel bore of lower material-containing chamber (5), and external diameter 80mm, is highly 150mm; Disk (4) radius 265mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210227407.9A CN102749439B (en) | 2012-07-03 | 2012-07-03 | Test and evaluation device for segregation of fresh concrete |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210227407.9A CN102749439B (en) | 2012-07-03 | 2012-07-03 | Test and evaluation device for segregation of fresh concrete |
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| CN102749439A CN102749439A (en) | 2012-10-24 |
| CN102749439B true CN102749439B (en) | 2015-04-22 |
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| CN104865156B (en) * | 2015-05-15 | 2017-11-14 | 长安大学 | A kind of cement concrete isolation degree evaluation device and its evaluation method |
| CN104931678B (en) * | 2015-07-06 | 2017-03-15 | 北京矿冶研究总院 | Mine cemented filling slurry segregation degree detection and evaluation method |
| CN105973751A (en) * | 2016-06-30 | 2016-09-28 | 长安大学 | Device and method for acquiring segregation degrees of cement concrete under horizontal centrifugal effects |
| CN106442945B (en) * | 2016-09-05 | 2019-08-23 | 中交第四航务工程局有限公司 | The test method that a kind of evaluable live fresh concrete layering situation and layering influence maturing |
| CN107422106B (en) * | 2017-08-03 | 2019-08-06 | 河海大学 | A kind of method of the anti-isolation characteristic of in situ quantitation assessment fresh concrete material |
| CN107576781A (en) * | 2017-09-15 | 2018-01-12 | 中国葛洲坝集团勘测设计有限公司 | A kind of device and method for determining pervious concrete service behaviour |
| CN108107193A (en) * | 2017-12-15 | 2018-06-01 | 哈尔滨工业大学 | A kind of test device and method of fresh concrete education resistance energy |
| CN108931626A (en) * | 2018-05-04 | 2018-12-04 | 武汉理工大学 | A kind of chutable concrete isolation rate test barrel |
| CN111624329A (en) * | 2020-06-11 | 2020-09-04 | 河南建达工程咨询有限公司 | Supervision and inspection method for field workability of high-performance concrete |
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