CN201757755U - Lightweight aggregate concrete cracking resistance evaluation device - Google Patents
Lightweight aggregate concrete cracking resistance evaluation device Download PDFInfo
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- CN201757755U CN201757755U CN 201020249190 CN201020249190U CN201757755U CN 201757755 U CN201757755 U CN 201757755U CN 201020249190 CN201020249190 CN 201020249190 CN 201020249190 U CN201020249190 U CN 201020249190U CN 201757755 U CN201757755 U CN 201757755U
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- lightweight aggregate
- aggregate concrete
- base plate
- evaluating apparatus
- reinforcing rod
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Abstract
The utility model discloses a lightweight aggregate concrete cracking resistance evaluation device, which comprises a bottom plate (1). At least three lateral plates (2) arranged on the bottom plate (1) and enclosed into a frame shape by end-to-end connection; a plurality of reinforcing steel bars (3) parallel to the bottom plate (1) are arranged among the lateral plates (2) and distributed transversely and longitudinally; a plurality of reinforcing steel columns (4) are vertically arranged on the bottom plate (1); and crossed positions of the transverse and longitudinal reinforcing steel bars (3) and crossed positions of the reinforcing steel bars (3) with the reinforcing steel columns (4) are bundled together. The lightweight aggregate concrete cracking resistance evaluation device is simple in structure and convenient in use, is applicable to comprehensive evaluation of lightweight aggregate concrete cracking-resistance, and has extremely high practicability and popularization value.
Description
Technical field
The utility model relates to a kind of device that is used for lightweight aggregate concrete cracking resistance combination evaluation.
Background technology
At present, along with improving constantly of the flourish and concrete technology of highway communication transport undertaking, the concrete of high workability, high strength, high-durability is widely used in construction projects such as road surface and bridge floor.Concrete is along with the use of super plasticizer, concrete water-cement ratio is significantly reduced, the increase of gel material content, this is the one of the main reasons that concrete produces the crack, concrete Research on Crack Resistance is along with the development of high performance concrete seems more and more important.The deformation performance of test concrete under constraint condition can reflect the behaviour in service of concrete in actual engineering really, do not have a kind of device can test lightweight aggregate concrete cracking performance under constraint condition at present.The shrinkage ratio of lightweight aggregate concrete self is bigger, finds that through practice cracking resistance device simulated field execution conditions can reflect actual cracking feature better.Therefore, provide a kind of device of lightweight aggregate concrete cracking resistance combination evaluation that is applicable to become the industry technical issues that need to address.
The utility model content
The purpose of this utility model is to provide a kind of simple in structure, device of can be used for lightweight aggregate concrete cracking resistance combination evaluation.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is: lightweight aggregate concrete splitting resistance evaluating apparatus, comprise base plate, stand on the described base plate and be provided with at least three blocks of side plates, each piece side plate joins end to end and surrounds shaped as frame, be provided with the some piece reinforcing rods parallel between described each piece side plate with base plate, the horizontal and vertical distribution of each root reinforcing rod, stand on the described base plate and be provided with some reinforcing bar posts, horizontal and the infall between the reinforcing rod longitudinally, and the infall colligation of reinforcing rod and reinforcing bar post is together.
Described side plate is four.
Described side plate is an angle steel, and its underrun is bolted on the base plate.
Described every block of side plate is provided with five reinforced holes, and the end of reinforcing rod is arranged in the reinforced hole.
Described base plate is provided with reinforced hole, and reinforcing bar post bottom is located in the reinforced hole and passes through bolt.
The diameter of described reinforcing rod is 6mm, and the spacing of vertical, horizontal reinforcing rod is 10cm.
The diameter of described reinforcing bar post is 5mm.
Owing to adopted above-mentioned structure, the utility model device has the following advantages:
1, at lightweight aggregate concrete aggregate easily float characteristics, the well whole splitting resistance of response light aggregate concrete.
2, the utility model device is fixed on side plate on the horizonal base plate by bolt, is convenient to remove clean, and reinforcing rod can be good by bolt.
3, the reinforcing bar of both direction intersects in length and breadth, well simulation has the site operation situation of reinforced concrete now, can well simulate the generation rule in crack, help the different concrete cracking resistances of comparison, thereby solved the problem that the irregularities of inducing the crack and cracking resistance are difficult to exact evaluation.
In sum, the utility model is simple in structure, easy to use, be applicable to lightweight aggregate concrete cracking resistance combination evaluation, and it both had been fit to testing laboratory and uses, and was fit to the working-yard again and used, and had very strong practicality and promotional value.
Description of drawings
Below in conjunction with accompanying drawing embodiment of the present utility model is described in further detail.
Fig. 1 is the stereographic map of lightweight aggregate concrete splitting resistance evaluating apparatus.
Embodiment
As shown in Figure 1, lightweight aggregate concrete splitting resistance evaluating apparatus described in the utility model comprises base plate 1, stands on the described base plate 1 and is provided with at least three blocks of side plates 2, and the side plate 2 among the embodiment is four, and each piece side plate 2 joins end to end and surrounds shaped as frame.Described base plate is made with the lightweight steel plate of thick 10mm, and long and the wide 700mm * 700mm that is respectively, side plate are to be that the lightweight angle steel of 600mm * 63mm * 5mm is made by length * highly * thickness, and the underrun of described side plate 2 is bolted on the base plate 1.Be provided with the some piece reinforcing rods 3 parallel between described each piece side plate 2 with base plate 1, each root reinforcing rod 3 horizontal and vertical distribution, the diameter of described reinforcing rod 3 is 6mm, the spacing of vertical, horizontal reinforcing rod 3 is 10cm.Described every block of side plate 2 is provided with five reinforced holes, and bore dia is 6mm, and the jack of symmetry direction must aim at, and the end of reinforcing rod 3 is arranged in the reinforced hole.Uprightly on the described base plate 1 be provided with some reinforcing bar posts 4, reinforcing bar post 4 is arranged for " quincuncial pile " formula.The diameter of described reinforcing bar post 4 is 5mm, and described base plate 1 is provided with reinforced hole, and reinforcing bar post 4 bottoms are located in the reinforced hole and pass through bolt.Horizontal and the infall between the reinforcing rod 3 longitudinally, and the infall of reinforcing rod 3 and reinforcing bar post 4 is by the colligation of finer wire bar together.
The concrete step of using of this device:
At base plate spread polyethylene film separation layer, with four blocks of side plates (angle steel) and base plate together, strengthen its whole rigidity then by bolt (1), earlier.And guarantee between side plate and the base plate very close to each otherly, the side plate angle steel does not have the slit each other yet, loads onto reinforcing rod 3 and reinforcing bar post 4, and infall is good with the thin wire colligation.
(2), with filling the lightweight aggregate concrete of newly mixing between side plate and the base plate, whole device is placed on the shaking table, be vibrated to and promptly end (about 40s) after the surface is paved, artificial floating concrete surface.
(3), concrete dull and stereotyped cracking resistance evaluating apparatus will be housed, and to be placed on temperature be 30 ℃, humidity is behind 60% the fog room, to cover with plastic sheeting.
(4), after about 1 hour, film is removed, give the air-supply of lightweight aggregate concrete planar surface with electric fan, controlled wind speed is 4.0m/s.
(5), after the air-supply, begin to observe in per 2 hours once, 12 as a child the back observed once in per 5 hours.Observe the fracture distribution situation on surface; The bar number, length, the width that comprise the crack are measured the crack and are adopted the crack mensuration magnifier of specialty to detect as far as possible, write down the time that the crack occurs at any time.
Use-case:
1m
3Lightweight aggregate concrete contains cement 420kg, flyash 100kg, sand 590kg, high-strength haydites of book structure 780kg, water 134kg, polycarboxylate water-reducer is the LC40 level lightweight aggregate concrete that 4.32kg, cellulose fibre 1kg, many anchor points steel fibre 40kg make, and is as shown in table 1 below with this novel operative installations test result
The Several Parameters computing method of reflection cracking resistance are as follows:
1) average area of cracks
Wherein,
Be total area of cracks
2) unit area cracking crack number:
3) total area of cracks of unit area: c=a * b (mm
2/ m
2)
W in the formula
iThe breadth extreme in-Di i root crack, mm;
I
iThe length in-Di i root crack, mm;
The total crack of N-number, root;
A-breadboard area, 0.36m
2
The evaluation criterion of the early stage splitting resistance grade of table 1 test specimen
The dull and stereotyped cracking of table 2 lightweight aggregate concrete crack developing situation result
By the result of this device experiment as can be seen: this lightweight aggregate concrete cracking resistance is better.
In a word; though the utility model has exemplified above-mentioned preferred implementation; but should illustrate; though those skilled in the art can carry out various variations and remodeling; unless such variation and remodeling have departed from scope of the present utility model, otherwise all should be included in the protection domain of the present utility model.
Claims (7)
1. lightweight aggregate concrete splitting resistance evaluating apparatus, it is characterized in that: comprise base plate (1), described base plate (1) is gone up the upright at least three blocks of side plates (2) that are provided with, each piece side plate (2) joins end to end and surrounds shaped as frame, be provided with the some piece reinforcing rods (3) parallel between described each piece side plate (2) with base plate (1), the horizontal and vertical distribution of each root reinforcing rod (3), described base plate (1) is gone up the upright some reinforcing bar posts (4) that are provided with, horizontal and the infall between the reinforcing rod (3) longitudinally, and the infall colligation of reinforcing rod (3) and reinforcing bar post (4) is together.
2. according to the described lightweight aggregate concrete splitting resistance of claim 1 evaluating apparatus, it is characterized in that: described side plate (2) is four.
3. according to the described lightweight aggregate concrete splitting resistance of claim 2 evaluating apparatus, it is characterized in that: described side plate (2) is an angle steel, and its underrun is bolted on the base plate (1).
4. according to the described lightweight aggregate concrete splitting resistance of claim 2 evaluating apparatus, it is characterized in that: described every block of side plate (2) is provided with five reinforced holes, and the end of reinforcing rod (3) is arranged in the reinforced hole.
5. according to each described lightweight aggregate concrete splitting resistance evaluating apparatus in the claim 1 to 4, it is characterized in that: described base plate (1) is provided with reinforced hole, and reinforcing bar post (4) bottom is located in the reinforced hole and passes through bolt.
6. according to each described lightweight aggregate concrete splitting resistance evaluating apparatus in the claim 1 to 4, it is characterized in that: the diameter of described reinforcing rod (3) is 6mm, and the spacing of vertical, horizontal reinforcing rod (3) is 10cm.
7. according to each described lightweight aggregate concrete splitting resistance evaluating apparatus in the claim 1 to 4, it is characterized in that: the diameter of described reinforcing bar post (4) is 5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020249190 CN201757755U (en) | 2010-07-06 | 2010-07-06 | Lightweight aggregate concrete cracking resistance evaluation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020249190 CN201757755U (en) | 2010-07-06 | 2010-07-06 | Lightweight aggregate concrete cracking resistance evaluation device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201757755U true CN201757755U (en) | 2011-03-09 |
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ID=43645037
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020249190 Expired - Lifetime CN201757755U (en) | 2010-07-06 | 2010-07-06 | Lightweight aggregate concrete cracking resistance evaluation device |
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| Country | Link |
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| CN (1) | CN201757755U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102680667A (en) * | 2012-05-11 | 2012-09-19 | 河海大学 | Concrete early-age crack resistance testing device capable of directly determining cracking position |
| 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 |
| 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 |
| CN108414732A (en) * | 2018-05-28 | 2018-08-17 | 华南理工大学 | A kind of round outside but spuare inside crack resistance |
-
2010
- 2010-07-06 CN CN 201020249190 patent/CN201757755U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN102680667A (en) * | 2012-05-11 | 2012-09-19 | 河海大学 | Concrete early-age crack resistance testing device capable of directly determining cracking position |
| CN102680667B (en) * | 2012-05-11 | 2015-03-25 | 河海大学 | Concrete early-age crack resistance testing device capable of directly determining cracking position |
| 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 |
| CN108414732A (en) * | 2018-05-28 | 2018-08-17 | 华南理工大学 | A kind of round outside but spuare inside crack resistance |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20110309 |
|
| CX01 | Expiry of patent term |