CN201344931Y - High-performance combined evaluation device for concrete cracking resistance - Google Patents
High-performance combined evaluation device for concrete cracking resistance Download PDFInfo
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- CN201344931Y CN201344931Y CNU2009200376194U CN200920037619U CN201344931Y CN 201344931 Y CN201344931 Y CN 201344931Y CN U2009200376194 U CNU2009200376194 U CN U2009200376194U CN 200920037619 U CN200920037619 U CN 200920037619U CN 201344931 Y CN201344931 Y CN 201344931Y
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Abstract
A high-performance combined evaluation device for concrete cracking resistance is provided. A through square case of the device is fixed on a horizontal pedestal, and is formed by welding an upper square-in-square panel, a lower square-in-square panel and four inner lateral plates; the bolts passing through the screw holes on the four borders of the lower square-in-square panel are fixed on the horizontal pedestal; two rows of short steel columns are welded on the sides of the inner lateral plates; and five rows of cases with reversed Y-shaped top are arranged at the center of the horizontal pedestal and welded on the horizontal pedestal to form a combined evaluation device. Compared with the prior art, the device is dismounted and cleaned more easily; as two rows of short steel columns are welded on the inner lateral plates and five rows of cases with reversed Y-shaped top are welded on the horizontal pedestal to form a multidimensional device for inducing cracks, the concrete can easily generate regular concretes, which is beneficial to evaluating the cracking resistance, thereby solving the problems of irregularity of the cracks induced by the device and difficult evaluation of the cracking resistance.
Description
One, technical field
The utility model relates to crack-resistant performance of concrete evaluation and field tests, specifically relates to high performance concrete cracking resistance combined type evaluating apparatus.
Two, background technology
Along with the development of concrete technology, high performance concrete with its high workability, high strength, high-durability to be widely used in construction project.High performance concrete adopts low water binder ratio and high gel material content owing to most, so concrete is easy to generate the crack.The research of concrete material splitting resistance is one of important research content of concrete field.
At present, the method for testing of concrete cracking performance mainly contains under the unconfined condition concrete cracking performance test methods under the concrete shrinkage method of testing and constraint condition.The deformation performance of test concrete under constraint condition more can reflect the behaviour in service of concrete in actual engineering.Still there is not the unified method of testing of estimating concrete material cracking performance under constraint condition in the national standard at present.Therefore be very necessary to concrete cracking performance Study of test method under constraint condition.
The method of testing of concrete cracking performance under constraint condition mainly contains flat band method.Flat band method is invented by Kraai, and its subject matter is that the crack produces irregularities, can't accurately estimate the concrete cracking performance, thereby make its quantification in the crack have deficiency aspect the late time data processing.
Domestic Tongji University adopts the stress induced flat method of multiple tracks, induce the crack of generation that certain rules is arranged, but plate edge does not have apparatus for deivation, thereby the crack regularity that plate edge produces is not strong.So press for the board device of a scientific and reasonable judge distress in concrete at present.
Three, utility model content
The purpose of this utility model is to provide a kind of high performance concrete cracking resistance combined type evaluating apparatus.Both be fit to the laboratory and used, and be fit to again use on the construction site.
The utility model is the combination of several moulds, forms a kind of high performance concrete cracking resistance combined type evaluating apparatus.
A kind of high performance concrete cracking resistance combined type evaluating apparatus, it is characterized in that this device is by horizontal base 1, three-back-shaped lower panel 2, three-back-shaped top panel 4, interior plate 3, short steel column 6, room, herringbone top shape box 7 constitutes, wherein four interior plates 3 are clipped between three-back-shaped top panel 4 and the three-back-shaped lower panel 2, place, weld mutually on four limits of following two panel internal orifices, be linked to be a square box body that runs through, again this box is fixedly connected on the horizontal base 1, be welded with respectively on the medial surface of four interior plates 3, two arrange short steel columns 6 down, be provided with five row room, herringbone top shape boxes 7 in the centre of three-back-shaped lower panel 2 internal orifices, and this box is fixedly welded on the horizontal base 1.
The used material of described combined type evaluating apparatus is the lightweight steel.
The length of described short steel column 6 is 50mm, and diameter is 5mm, and spacing is 50mm.
On four frames of described three-back-shaped lower panel 23 bolts hole 5 are arranged respectively.
Be furnished with 12 bolts hole on the described horizontal base 1, and be complementary with the bolt hole 5 of three-back-shaped lower panel 2.
It is described that to run through square box body be to be connected with 12 bolts hole on the horizontal base 1 by 12 bolts hole, the 5 usefulness bolts on the three-back-shaped lower panel.
The length of room, described herringbone top shape box is 480mm, the wide 50mm of box, top wedge angle be 75 the degree, from top be 55mm to the bottom height.
The using method of device:
(1) will " the square box body that runs through " runs through thread jack and be fixed by bolts on the horizontal base 1, and guarantee between " the square box body that runs through " and the horizontal base 1 very close to each other by three on every limit, lower panel four limits.
(2) will fill concrete in " the square box body that runs through ", whole device will be carried on bumper, shake 30 seconds, floating concrete surface.
(3) concrete dull and stereotyped cracking resistance evaluating apparatus will being housed, to be placed on temperature be 30 ℃, and humidity is 60% fog room, and the wind speed by electric fan control concrete surface is 4.2m/s.
(4) maintenance was observed the fracture distribution situation on surface after 24 hours; The bar number that comprises the crack, the length in crack, the width in crack.
The utility model device has been compared following advantage with evaluating apparatus in the past:
(1) similar in the past mould is difficult to clean, and the utility model is fixed on " the square box body that runs through " on the horizontal base 1 by screw, is convenient to remove clean.
(2) respectively be welded with " room, the herringbone top shape box " that be welded with on short steel column of two rows and the base plate around the medial surface of interior plate and form the multi-faceted crack device of inducing, make the concrete test piece be easy to produce crack clocklike, help the different concrete cracking resistances of comparison, induce the irregularities in crack and the problem that cracking resistance is difficult to exact evaluation thereby overcome existing apparatus.
Four, description of drawings:
Fig. 1: the structural representation of combined type evaluating apparatus.
Fig. 2: the vertical view of combined type evaluating apparatus.
Reference numeral: 1-base plate, 2-lower panel, 3-interior plate, 4-top panel, 5-run through thread jack, the short steel column of 6-, room, 7-herringbone top shape box.
Five, specific embodiment mode:
With reference to accompanying drawing specific embodiment of the utility model is described:
High performance concrete cracking resistance evaluating apparatus is by forming " the square box body that runs through " (being made up of lower panel 2, interior plate 3, top panel 4) and horizontal base 1, wherein lower panel 2 and top panel 4 are that 800mm * 800mm, the inboard length of side are 600mm * 600mm " three-back-shaped steel plate is made " by the outside length of side all, should " three-back-shaped steel plate " are to be that the lightweight steel plate of 5mm is made by thickness.Interior plate 3 is made by four block plates, every block plate all is to be that the lightweight steel plate of 600mm * 63mm * 5mm is made by length x width x thickness, be welded with the short steel column of two rows on the medial surface of every block plate, be spaced apart 50mm between per two adjacent short steel columns, short steel column on the limit all is 50mm to the distance at edge, and short steel column all is to be that 5mm highly is that the light reinforced of 50mm made by diameter; Horizontal base 1 is to be that the lightweight steel plate of 1000mm * 1000mm * 10mm is made by length x width x thickness, on horizontal base 1, be welded with five rows' " room, herringbone top shape box ", this shape box top, room, herringbone top wedge angle is 75 degree, the box width is 50mm, length is 480mm, and the pinnacle is 55mm to the distance of base plate.All there are equally spaced three to run through thread jack weekly around the horizontal base 1, this diameter that runs through thread jack is 5mm, running through thread jack by this can link together horizontal base 1 and " the square box body that runs through ", forms the high performance concrete cracking resistance evaluating apparatus.
Use-case:
1m
3Concrete contains cement 290kg, flyash 73kg, and water 145kg, gravelstone 511kg, middle stone 766kg, naphthalene sulfonate aqua 4.5kg, colophonium pyrolytic polymer air entraining agent 0.06kg, kaolin is that 15.4kg makes high performance concrete partially.The result is as shown in table 1 with this novel practical device to test,
The Several Parameters computing method of reflection cracking resistance are as follows:
1) area that on average splits in crack
2) the cracking crack number of unit area
3) area that always splits on the unit area
C＝a·b
In the formula:
W
iBe the breadth extreme in i root crack, mm.
L
iBe the length in i root crack, mm.
N is total crack number, root.
A is dull and stereotyped area 0.36m
2
The early stage splitting resistance interpretational criteria of test specimen has following four:
1) very thin crack is only arranged.
2) area＜10mm that on average splits
2
3) unit area cracking crack number＜10/m
2
4) area＜100mm that always splits on the unit area
2/ m
2
According to above-mentioned criterion, splitting resistance is divided into five grades:
I level: all satisfy above-mentioned four conditions.
II level: satisfy 3 in above-mentioned four conditions.
III level: satisfy 2 in above-mentioned four conditions.
IV level: satisfy any one in above-mentioned four conditions.
V level: all do not satisfy.
Table 1 concrete slab cracking crack treatment result
| Area mm always splits 2 | Total crack number root | Area mm on average splits 2/ root | The cracking crack number root/m of unit area 2 | The area mm that always splits on the unit area 2/m 2 | The splitting resistance opinion rating |
| 5.02 | 3 | 2 | 8.3 | 7.0 | The I level |
By the result of this device experiment as can be seen: this high performance concrete cracking resistance is better.
Claims (7)
1. high performance concrete cracking resistance combined type evaluating apparatus, it is characterized in that this device is by horizontal base (1), three-back-shaped lower panel (2), three-back-shaped top panel (4), interior plate (3), short steel column (6), room, herringbone top shape box (7) constitutes, wherein four interior plates (3) are clipped between three-back-shaped top panel (4) and the three-back-shaped lower panel (2), place, weld mutually on four limits of following two panel internal orifices, be linked to be a square box body that runs through, this box is fixedly connected on the horizontal base (1) again, be welded with respectively on the medial surface of four interior plates (3), two arrange short steel columns (6) down, be provided with five row's room, herringbone top shape boxes (7) in the centre of three-back-shaped lower panel (2) internal orifice, and this box is fixedly welded on the horizontal base (1).
2. combined type evaluating apparatus according to claim 1 is characterized in that the used material of this device is the lightweight steel.
3. combined type evaluating apparatus according to claim 1, the length that it is characterized in that described short steel column (6) is 50mm, and diameter is 5mm, and spacing is 50mm.
4. combined type evaluating apparatus according to claim 1 is characterized in that on four frames of described three-back-shaped lower panel (2) 3 bolts hole (5) being arranged respectively.
5. combined type evaluating apparatus according to claim 1 is characterized in that being furnished with on the described horizontal base (1) 12 bolts hole, and is complementary with the bolt hole (5) of three-back-shaped lower panel (2).
6. combined type evaluating apparatus according to claim 1 is characterized in that the described rectangular parallelepiped box that runs through is to be connected with 12 bolts hole on the horizontal base (1) with bolt by 12 bolts hole (5) on the three-back-shaped lower panel.
7. combined type evaluating apparatus according to claim 1 is characterized in that the length of room, described herringbone top shape box is 480mm, the wide 50mm of box, top wedge angle be 75 the degree, from top be 55mm to the bottom height.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200376194U CN201344931Y (en) | 2009-01-20 | 2009-01-20 | High-performance combined evaluation device for concrete cracking resistance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009200376194U CN201344931Y (en) | 2009-01-20 | 2009-01-20 | High-performance combined evaluation device for concrete cracking resistance |
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| CN201344931Y true CN201344931Y (en) | 2009-11-11 |
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| CNU2009200376194U Expired - Fee Related CN201344931Y (en) | 2009-01-20 | 2009-01-20 | High-performance combined evaluation device for concrete cracking resistance |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102426228A (en) * | 2011-10-31 | 2012-04-25 | 中国铁道科学研究院金属及化学研究所 | Concrete cracking induction device and method |
| CN102759612A (en) * | 2012-07-27 | 2012-10-31 | 广西壮族自治区水利科学研究院 | Multi-angle cement concrete surface crack resistance performance inspection device |
| CN102798707A (en) * | 2012-09-09 | 2012-11-28 | 中国水利水电第三工程局有限公司 | Concrete restrained contraction ring crack resistance test device and test method |
| CN103257220A (en) * | 2012-02-22 | 2013-08-21 | 北京中企卓创科技发展有限公司 | Concrete early-stage crack resistance test device and test method |
| CN103728169A (en) * | 2014-01-06 | 2014-04-16 | 宁波工程学院 | High-rigidness reinforced concrete test specimen crack width controller and crack formation method |
| CN103954644A (en) * | 2014-05-12 | 2014-07-30 | 中国民航机场建设集团公司 | Device for simulating crack expanding form of carbon fiber concrete airfield pavement |
| CN106840060A (en) * | 2017-04-07 | 2017-06-13 | 吉林大学 | The verifying attachment of reference block combined type vehicle-mounted road surface flaw detection system |
| CN110261226A (en) * | 2019-07-09 | 2019-09-20 | 武汉理工大学 | A kind of ultra-high performance concrete cracking resistance system safety testing device and method |
-
2009
- 2009-01-20 CN CNU2009200376194U patent/CN201344931Y/en not_active Expired - Fee Related
Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102426228A (en) * | 2011-10-31 | 2012-04-25 | 中国铁道科学研究院金属及化学研究所 | Concrete cracking induction device and method |
| CN102426228B (en) * | 2011-10-31 | 2014-07-23 | 中国铁道科学研究院金属及化学研究所 | Concrete cracking induction device and method |
| CN103257220A (en) * | 2012-02-22 | 2013-08-21 | 北京中企卓创科技发展有限公司 | Concrete early-stage crack resistance test device and test method |
| CN102759612A (en) * | 2012-07-27 | 2012-10-31 | 广西壮族自治区水利科学研究院 | Multi-angle cement concrete surface crack resistance performance inspection device |
| CN102759612B (en) * | 2012-07-27 | 2015-04-29 | 广西壮族自治区水利科学研究院 | Multi-angle cement concrete surface crack resistance performance inspection device |
| CN102798707A (en) * | 2012-09-09 | 2012-11-28 | 中国水利水电第三工程局有限公司 | Concrete restrained contraction ring crack resistance test device and test method |
| CN102798707B (en) * | 2012-09-09 | 2014-08-13 | 中国水利水电第三工程局有限公司 | Concrete restrained contraction ring crack resistance test device and test method |
| CN103728169A (en) * | 2014-01-06 | 2014-04-16 | 宁波工程学院 | High-rigidness reinforced concrete test specimen crack width controller and crack formation method |
| CN103728169B (en) * | 2014-01-06 | 2015-09-09 | 宁波工程学院 | Large rigidity reinforced concrete test specimen control of crack width instrument and crack formulating method thereof |
| CN103954644A (en) * | 2014-05-12 | 2014-07-30 | 中国民航机场建设集团公司 | Device for simulating crack expanding form of carbon fiber concrete airfield pavement |
| CN106840060A (en) * | 2017-04-07 | 2017-06-13 | 吉林大学 | The verifying attachment of reference block combined type vehicle-mounted road surface flaw detection system |
| CN110261226A (en) * | 2019-07-09 | 2019-09-20 | 武汉理工大学 | A kind of ultra-high performance concrete cracking resistance system safety testing device and method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20091111 Termination date: 20120120 |