CN101881711A - Exterior paint system crack resistance testing machine and method for manufacturing test-piece - Google Patents
Exterior paint system crack resistance testing machine and method for manufacturing test-piece Download PDFInfo
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- CN101881711A CN101881711A CN 201010209874 CN201010209874A CN101881711A CN 101881711 A CN101881711 A CN 101881711A CN 201010209874 CN201010209874 CN 201010209874 CN 201010209874 A CN201010209874 A CN 201010209874A CN 101881711 A CN101881711 A CN 101881711A
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Abstract
The invention discloses an exterior paint system crack resistance testing machine and a method for manufacturing a test-piece, belonging to a testing device for crack resistance of building units. The testing machines are characterized by comprising a base, a U-type rack and a steel support concrete bottom plate, wherein the U-type rack consists of the base and lateral plates, the steel support concrete bottom plate is arranged on the upper part of the U-type rack, two ends of the steel support concrete bottom plate are fixed on the lateral plates of the U-type rack through load transfer bolts; a guide rail is arranged at the bottom of the steel support concrete bottom plate, and the part on the inner side of the U-type rack, which is close to the steel support concrete bottom plate is provided with a hollow expansion rod. The invention can stimulate dry shrinkage of walls to generate cracks, can slowly pull the wall to crack, and has very low pulling speed. The invention has simple structure, easy implementation, low construction cost, low operating cost and easy operation.
Description
Technical field:
The present invention relates to the method for making of a kind of exterior paint system crack resistance testing machine and test specimen, it belongs to the cracking property test and testing device of building element.
Background technology:
Skin (comprising concrete walls and masonry wall) is owing to reasons such as drying contractions, and its basic unit may produce the crack makes the rendering layer of its outside also produce the crack, influences attractive in appearance and may cause percolating water.For solving exterior paint system cracking problem, present many producers have released panoramic crack prevention and crack resistance product, and existing technical manual has also proposed multiple cracking resistance measure.But there are not reliable equipment and test method to confirm the effect of prestressed of these products and measure at present.If can not these products of valid certificates and the true cracking resistance of these cracking resistance measures, directly use, may make cost of construction improve and but can not solve the problem that exterior paint system ftractures.If can before these products and cracking resistance measure are used for engineering project, just can carry out the splitting resistance test to them, just can eliminate invalid product, the unnecessary measure of minimizing in advance, save a large amount of manpower and materials, the assurance construction quality.Therefore be necessary the splitting resistance of body of wall and rendering layer thereof is studied, and the prerequisite of studying is exactly to develop a kind of crack resistance testing machine of practicality, and clear and definite cracking test method.Usually material stretch test machine is generally adopted in tension test.Material test specimen stock size is less, finds at present testing machine special-purpose or situation when being suitable for stretching body of wall test specimen, simulation wall crazing as yet.Concrete reason is that the body of wall test specimen is bulky, and the installation of the clamping of test specimen, fracture width surveying instrument etc. operates on the existing testing machine and can't realize.
Existing testing machine all is to adopt motor to produce power, and process hydraulic means or worm gear screw body are converted to rotatablely moving of motor the motion of the required straight line that stretches again.The special-purpose testing machine that is fit to stretching body of wall test specimen according to the principle specialized designs that has testing machine now is feasible in theory, but cost will be very high.
It is huge that the testing equipment that utilizes prior art design production body of wall slowly can be drawn back certainly exists equipment volume, the shortcoming that production cost is high.The someone attempts producing this testing machine as yet at present.And the phenomenon of wall crazing is of common occurrence in the actual engineering, has become the common fault of construction work.
Summary of the invention:
The object of the present invention is to provide a kind of simple in structure, the exterior paint system crack resistance testing machine that experimentation cost is low and easy to implement and the method for making of test specimen.
The object of the present invention is achieved like this:
A kind of exterior paint system crack resistance testing machine, it is characterized in that the U type frame that it comprises base, is made up of base and side plate, the steel holder concrete floor that is arranged on U type upper rack, the two ends of described steel holder concrete floor are bolted on the side plate of described U type frame by power transmission; Bottom at described steel holder concrete floor is provided with a guide rail; Be provided with hollow expansion rod at the inboard position of described U type frame near steel holder concrete floor.
Described U type frame is made of two channel-section steels that be arranged in parallel base that constitutes and the side plate that is arranged on the base, and the bottom of side plate is bent into an angle of 90 degrees and the knuckle place is an arc chord angle, and the horizontal component and the base of the bending of described side plate are welded to connect.
Described side plate is provided with the stiffening rib that increases rigidity; Be provided with the steel corbel of placement and scalable rail height in the side plate inboard of described U type frame.
Described hollow expansion rod is the thick-walled pipe of two ends shutoff, and the close two-end part of hollow expansion rod is provided with into water water nozzle and water outlet water nozzle, and described hollow expansion rod two ends is fixed on the side plate of U type frame.
Described hollow expansion rod is symmetricly set on the below of steel holder concrete floor.
Described hollow expansion rod is symmetricly set on the position, both sides of steel holder concrete floor, with steel holder concrete floor on same horizontal level.
Described steel holder concrete floor is identical and link together by control seam bolt at the steel tray of same surface level by two sizes, and is provided with the normal concrete layer and constitutes at the upper surface of described steel tray.
The water inlet water nozzle of described hollow expansion rod is connected to one by a water circulating pump and adds hot water storgae, and its water outlet water nozzle is directly connected to this and adds hot water storgae.
A kind of method for making that is used for the exterior paint system crack resistance testing machine test specimen is characterized in that it comprises following step:
At first at the external coating I type concrete interface agent of the normal concrete layer of the steel holder concrete floor of exterior paint system crack resistance testing machine, and carry out linked network according to the requirement of the extension woven wire of routine in the piece position of the steel tray of steel holder concrete floor; Can carry out plastering of screed-coat immediately after the linked network, the screed-coat width is than the narrow 100mm of steel holder concrete width, the wide concrete surface of 50mm that the test specimen both sides is respectively exposed be convenient to observe crack production on the concrete base layer; Screed-coat carries out beginning to make water barrier after the maintenance, promptly scrapes and smears the thick waterproof mortar of 3mm, treat that waterproof mortar solidifies after, smear the 2nd road waterproof mortar scraping, make waterproofing layer thickness reach architectural design thickness, described water barrier width is identical with screed-coat; After water barrier is finished maintenance, carry out the making of finish coat, carry out at least three days maintenance after finishing the making of finish coat.
Described woven wire steel wire diameter 1mm, mesh size is 20mm * 20mm, netting width 300mm; When plastering whole steel fabric sheet is wrapped in mortar inside, coat of plaster thickness is 15mm.
The present invention can realize simulating the dry contraction of body of wall and produce the crack, body of wall slowly can be pulled to cracking, and low-down draw speed is arranged, and draw speed should be low to moderate 0.01mm/min, and adjustable within the specific limits.Secondly, the present invention should have certain rigidity, when test specimen during by drawing crack, shuts down at once, and the crack of generation should be greater than 0.1mm.The installation of the clamping of test specimen of the present invention, crack measurement mechanism is simple and convenient, can test the splitting resistance of exterior paint system efficiently, estimates the validity of cracking resistance anticracking product, finds out the most effective way that solves the external wall cracking.The present invention is simple in structure, implements easily; Cost is low, and operating cost is low; Simple to operate, labour intensity is low.
Description of drawings:
Fig. 1 is a structural representation of the present invention
Fig. 2 is the A-A cut-open view of Fig. 1 of the present invention
Fig. 3 is the structural representation of the embodiment of the invention 2
Fig. 4 is the B-B cut-open view of Fig. 3 of the present invention
Embodiment:
Below in conjunction with accompanying drawing 1, Fig. 2, Fig. 3 and Fig. 4, the present invention is further detailed:
Embodiment 1, as shown in accompanying drawing 1 and Fig. 2.
Exterior paint system crack resistance testing machine of the present invention comprises base 1, side plate 7, the U type frame that base and side plate constitute, be arranged on the steel holder concrete floor 3 of U type upper rack, the two ends of described steel holder concrete floor 3 are fixed on the side plate 7 of described U type frame by power transmission bolt 6.Described U type frame is made of two channel-section steels that be arranged in parallel base 1 that constitutes and the side plate 7 that is arranged on the base, and the two ends of described two channel-section steels that be arranged in parallel 36 are provided with the bolt 35 of regulating stability.The bottom of described side plate is bent into an angle of 90 degrees and the knuckle place is an arc chord angle, makes the side plate bending part have certain elasticity, and the horizontal component of the bending of described side plate and base 1 are by being welded to connect.Described steel holder concrete floor 3 comprises two parts, a part be by two sizes identical and at the steel tray 34 of same surface level by control seam bolt 31 with its complete steel tray that links together symmetrically, another part is the normal concrete layer 33 that the upper surface at described steel tray 34 is provided with.Position near steel holder concrete floor 3 in described U type frame is provided with hollow expansion rod 2.Described hollow expansion rod 2 is the thick-walled pipe of two ends shutoff, uses the manufacturing materials of aluminium as hollow expansion rod 2 in the present embodiment, because the thermal expansivity of aluminium is big and have a favorable mechanical performance.The close two-end part of hollow expansion rod 2 is provided with into water water nozzle 21 and water outlet water nozzle 22, and described hollow expansion rod 2 two ends are fixed on the side plate of U type frame.Described hollow expansion rod 2 is arranged on the below of steel holder concrete floor 3.For bulk strength and the rigidity that increases testing machine of the present invention, described side plate 7 is provided with the stiffening rib 71 that increases rigidity; Be provided with the steel corbel 4 of placing guide rail 5 and scalable guide rail 5 height in the side plate inboard of described U type frame.The water inlet water nozzle 21 of described hollow expansion rod 2 is connected on the miniature water circulating pump, adds hot water storgae and the water inlet of water pump is connected to one, and the water outlet water nozzle 22 of expansion rod 2 is directly connected to the described hot water storgae that adds.Steel holder concrete floor can be made a plurality of according to the needs of test, so that batch making exterior paint system test specimen improves test efficiency.On steel holder concrete floor, make the exterior paint system 32 that constitutes by coat of plaster, water barrier and finish coat then, so just constituted the test specimen of a plurality of test usefulness.When testing, test specimen integral installation that can maintenance is good is on U type frame of the present invention.
The formation of described exterior paint system belongs to the part of prior art, normally determines material and the thickness that whitewashes according to the requirement of architectural design.Coat of plaster is to spread upon basic unit's surface of wall by motar, plays the synthem of levelling, protective effect in exterior paint system.Finish coat is the decorating structure layer of exterior paint system, comprises coating ornamental surface layer, decoration mortar finish coat and tile decorative surface layer.
The method for making of the test specimen of described exterior paint system crack resistance testing machine, it comprises following step, promptly makes exterior paint system on steel holder concrete floor.
At first at the external coating I type concrete interface agent of the normal concrete layer 33 of the steel holder concrete floor 3 of exterior paint system crack resistance testing machine, and in the piece position of the steel tray of steel holder concrete floor 3 linked network according to the extension woven wire of routine requires to carry out linked network; Can carry out plastering of screed-coat immediately after the linked network, the screed-coat width makes the test specimen both sides respectively expose the wide concrete surface of 50mm than the narrow 100mm of steel holder concrete width, is used for observing at the trial the generation in the crack on the concrete base layer; Should note when plastering whole steel fabric sheet is wrapped in mortar inside, coat of plaster thickness is 15mm.Screed-coat carries out beginning to make water barrier after the maintenance, promptly scrapes and smears the thick waterproof mortar of 3mm, treat that waterproof mortar solidifies after, smear the second road waterproof mortar scraping, make waterproofing layer thickness reach architectural design thickness, described water barrier width is identical with screed-coat; Usually the time of the maintenance of screed-coat is two days, and the time of the maintenance of water barrier is three days.After water barrier is finished maintenance, carry out whitewashing or sticking brick of coating class finish coat, carry out at least three days maintenance after finishing the making of finish coat.Whitewashing of coating class finish coat need be whitewashed according to the construction requirement of the employed material of finish coat.
In the present embodiment, described woven wire steel wire diameter 1mm, mesh size is 20mm * 20mm, netting width 300mm; When plastering whole steel fabric sheet is wrapped in mortar inside.
Concrete test procedure of the present invention is as follows:
1) sample for preparing is installed on the above-mentioned crazing-resistance test machine, unscrews the control seam bolt on the steel holder concrete floor;
2) start testing machine of the present invention, promptly start water circulating pump and recirculated water is heated, in the present embodiment, add hot water storgae and miniature water circulating pump provides hydronic water to described hollow expansion rod 2 by startup, the water of heating enters hollow expansion rod 2 by water inlet water nozzle 21, flow out by water outlet water nozzle again, flow back to the described hot water storgae that adds along pipeline.The programming rate of regulating tank just can control stretching speed, presses the speed tensile test specimen of per minute stretching 0.01mm～0.03mm;
3) when the crack appears in the concrete base layer of test specimen, begin to measure the width and the record in its crack;
4) continue step 2 and step 3, measure and write down fracture width at least one time every 1min;
5) continue step 4, the crack occurs until finish coat.
The maximum crack width that the concrete base layer that records before the crack appears in finish coat is the splitting resistance testing result of system.
Principle of work of the present invention is as follows:
Need apply pulling force and the final crack that produces less than 1mm to test specimen when using testing machine of the present invention.Though being connected of base and side plate is welding, because the bottom of side plate is bending 90 degree and has certain circular arc, and require the displacement very little (every side is less than 0.5mm) on the top of side plate, so whole relatively side plate, this is a kind of elasticity connection.
Hollow expansion rod is installed on U type frame, is passed to hot water, the expansion rod elongation of will expanding if give in the expansion rod this moment.The length of getting expansion rod is 1m, and the expansion coefficient of aluminium is 2.7 * 10
-5, can calculate, 1 ℃ of the every rising of temperature, expansion rod elongation 0.027mm.If during test temperature is risen to 80 ℃ by 30 ℃, the elongation of expansion rod can reach 1.35mm so.Can satisfy request for utilization fully.
After installing test specimen, need screw power transmission bolt 6, hollow expansion rod suffers restraints and produces resilient force on side plate, and this moment, the bending part of side plate can be regarded hinge as, and other positions of side plate can be regarded rigid body as.Test specimen reaches balance to the acting force of side plate and expansion rod to the acting force of side plate.When beginning that expansion rod passed to the water of continuous intensification, expansion rod is expanded by heating gradually, and the upper end of side plate will produce displacement, to test specimen apply pulling force until test specimen by drawing crack, stop heating and finish test.Owing to all will produce certain elastic deformation after expansion rod, side plate, test specimen are stressed, thus finally during 50 ℃ of temperature rises the displacement of the upper end of side plate may not reach 1mm, but also be enough to satisfy testing requirements.
Embodiment 2, as shown in Fig. 3 and Fig. 4:
Stressed evenly in order further to guarantee test specimen, be not easy to occur the inconsistent phenomenon of both sides fracture width.Described in the present embodiment hollow expansion rod 25 is arranged on the position, both sides of steel holder concrete floor 3, with steel holder concrete floor 3 on same horizontal level.The stiffening rib 72 of present embodiment latus inframedium 7 should be welded on the top of side plate and be the horizontal direction setting.
Other parts and the embodiment 1 of present embodiment are identical.
Claims (10)
1. exterior paint system crack resistance testing machine, it is characterized in that the U type frame that it comprises base (1), is made up of base and side plate (7), the steel holder concrete floor (3) that is arranged on U type upper rack, the two ends of described steel holder concrete floor (3) are fixed on the side plate (7) of described U type frame by power transmission bolt (6); In the bottom of described steel holder concrete floor (3) guide rail (5) is set; Be provided with hollow expansion rod (2) at the inboard position of described U type frame near steel holder concrete floor (3).
2. the exterior paint system crack resistance testing machine described in claim 1, the side plate (7) that it is characterized in that the base (1) that described U type frame is made of two channel-section steels that be arranged in parallel and be arranged on the base constitutes, the bottom of side plate is bent into an angle of 90 degrees and the knuckle place is an arc chord angle, and the horizontal component of the bending of described side plate and base (1) are welded to connect.
3. the exterior paint system crack resistance testing machine described in claim 1 is characterized in that the stiffening rib (71,72) that described side plate (7) is provided with increases rigidity; Be provided with the steel corbel (4) of placement and scalable guide rail (5) height in the side plate inboard of described U type frame.
4. the exterior paint system crack resistance testing machine described in claim 1, it is characterized in that described hollow expansion rod (2) is the thick-walled pipe of two ends shutoff, the close two-end part of hollow expansion rod (2) is provided with into water water nozzle (21) and water outlet water nozzle (22), and described hollow expansion rod (2) two ends is fixed on the side plate of U type frame.
5. the exterior paint system crack resistance testing machine described in claim 4 is characterized in that described hollow expansion rod (2) is symmetricly set on the below of steel holder concrete floor (3).
6. the exterior paint system crack resistance testing machine described in claim 4 is characterized in that described hollow expansion rod (2) is symmetricly set on the position, both sides of steel holder concrete floor (3), with steel holder concrete floor (3) on same horizontal level.
7. the exterior paint system crack resistance testing machine described in claim 1, it is characterized in that described steel holder concrete floor (3) is identical and link together by control seam bolt (31) at the steel tray (34) of same surface level by two sizes, and be provided with normal concrete layer (33) and constitute at the upper surface of described steel tray.
8. the exterior paint system crack resistance testing machine described in claim 1 or 2 or 3 or 4 or 5 or 6, the water inlet water nozzle (21) that it is characterized in that described hollow expansion rod (2) is connected to one by a water circulating pump and adds hot water storgae, and its water outlet water nozzle (22) is directly connected to this and adds hot water storgae.
9. method for making that is used for the exterior paint system crack resistance testing machine test specimen is characterized in that it comprises following step:
At first at the external coating I type concrete interface agent of the normal concrete layer (33) of the steel holder concrete floor (3) of exterior paint system crack resistance testing machine, and carry out linked network according to the requirement of the extension woven wire of routine in the piece position of the steel tray of steel holder concrete floor (3); Can carry out plastering of screed-coat immediately after the linked network, the screed-coat width is than the narrow 100mm of steel holder concrete width, the wide concrete surface of 50mm that the test specimen both sides is respectively exposed be convenient to observe crack production on the concrete base layer; Screed-coat carries out beginning to make water barrier after the maintenance, promptly scrapes and smears the thick waterproof mortar of 3mm, treat that waterproof mortar solidifies after, smear the 2nd road waterproof mortar scraping, make waterproofing layer thickness reach architectural design thickness, described water barrier width is identical with screed-coat; After water barrier is finished maintenance, carry out the making of finish coat, carry out at least three days maintenance after finishing the making of finish coat.
10. the method for making that is used for the exterior paint system crack resistance testing machine test specimen described in claim 9 is characterized in that described woven wire steel wire diameter 1mm, and mesh size is 20mm * 20mm, netting width 300mm; When plastering whole steel fabric sheet is wrapped in mortar inside, coat of plaster thickness is 15mm.
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| CN 201010209874 CN101881711B (en) | 2010-06-25 | 2010-06-25 | Exterior paint system crack resistance testing machine and method for manufacturing test-piece |
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Cited By (7)
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| CN102095638A (en) * | 2010-12-31 | 2011-06-15 | 上海市隧道工程轨道交通设计研究院 | Crack resistance test method of seam sealing material for tunnel seams |
| CN102607968A (en) * | 2012-03-08 | 2012-07-25 | 上海天补建筑科技有限公司 | Method for measuring crack resistance of composite coating coated on outer wall |
| CN102914470A (en) * | 2012-11-15 | 2013-02-06 | 上海城建市政工程（集团）有限公司 | Device and method for testing concrete sample beam stiffness |
| CN104198285A (en) * | 2014-09-11 | 2014-12-10 | 北京东方雨虹防水技术股份有限公司 | Experimental device and testing method for simulating base layer cracking resistance of coating |
| CN105067429A (en) * | 2015-07-08 | 2015-11-18 | 中国石油天然气股份有限公司 | Corrosion prevention sealing detection method for storage tank |
| 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 |
| CN116773340A (en) * | 2023-06-14 | 2023-09-19 | 常熟市工程质量检测中心有限公司 | Crack resistance test device for exterior wall material |
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| CN102095638A (en) * | 2010-12-31 | 2011-06-15 | 上海市隧道工程轨道交通设计研究院 | Crack resistance test method of seam sealing material for tunnel seams |
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| CN105067429A (en) * | 2015-07-08 | 2015-11-18 | 中国石油天然气股份有限公司 | Corrosion prevention sealing detection method for storage tank |
| CN105067429B (en) * | 2015-07-08 | 2017-12-05 | 中国石油天然气股份有限公司 | A kind of storage tank preserving and sealing detection method |
| 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 |
| CN116773340A (en) * | 2023-06-14 | 2023-09-19 | 常熟市工程质量检测中心有限公司 | Crack resistance test device for exterior wall material |
| CN116773340B (en) * | 2023-06-14 | 2024-02-23 | 常熟市工程质量检测中心有限公司 | Crack resistance test device for exterior wall material |
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