CN101509868A - Interface shearing strength test method for adhesive bonding sample of sealant and substrate - Google Patents
Interface shearing strength test method for adhesive bonding sample of sealant and substrate Download PDFInfo
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- CN101509868A CN101509868A CNA2009100211637A CN200910021163A CN101509868A CN 101509868 A CN101509868 A CN 101509868A CN A2009100211637 A CNA2009100211637 A CN A2009100211637A CN 200910021163 A CN200910021163 A CN 200910021163A CN 101509868 A CN101509868 A CN 101509868A
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Abstract
The invention discloses a testing method of the shearing resistance between a sealing gum and a stuck sample interface of a stuck base material, which manufactures the stuck base material into two samples, and a cavity with specified size is reserved in the middle for injecting the sealing gum, thus integrating the stuck base material and the sealing gum into a whole stuck sample which is placed in the environment with the temperature of 20 DEG C minus or plus 2 DEG C and the relative humidity of 65 percent minus or plus 5 percent for being conserved for 28 days, and the samples are respectively placed into an upper shearing box and a lower shearing box, positive pressure P1 is exerted on an upper part, and horizontal force P2 is exerted simultaneously. The shearing force exerted on the samples is measured by a dynamic meter 5. The shearing force P2 is exerted with specified loading rate, and until a shearing surface between the stuck base material and the sealing gum is destroyed, and the largest force measured by the dynamic meter 5 is the shearing resistant force. The value obtained by dividing the shearing resistant force by the area of the stuck sample interface is the shearing resistance between the bonding interfaces of the stuck base material and the sealing gum under the positive pressure P1. The testing method of the shearing resistance between the sealing gum and the stuck sample interface of the stuck base material has simple operation, convenient use and favorable popularization, has no need of new additional equipments, and has strong guidance to specific industrial practices.
Description
Technical field
The invention belongs to building materials performance test field, particularly a kind of fluid sealant with by the method for testing of bonded substrate bonding sample interface shearing strength.
Background technology
At present, the method for homogenous material shear behaviors such as test concrete etc. is very ripe.And the method for the shearing strength of model engineering actual conditions test compound material adhesive face does not also have report.When fluid sealant is used for concrete construction joint or expansion joint as joint filling or joint filler, the weakest position of the impervious often ability of bonding interface.Because bonding plane is to be composited by two kinds of materials, at first, kind, proportioning, the viscosity of being glued voidage, space kenel, roughness and the polymer sealant of substrate surface all influence shear resistance.In addition, whether the cleanliness at interface, roughness, humidity, interface silane coupling agent are used, the kind of interface silane coupling agent etc. also influences shear resistance.At last, temperature, the humidity during construction, whether wind is arranged, environmental baseline such as whether snow also influences shear resistance.For hydraulic engineering, when situations such as yielding of foundation, structure sediment occurring, fluid sealant is subjected to shearing force with the sticking interface of quilt, when shearing force has surpassed shearing strength, the seam interface is just destroyed, directly influenced construction quality, severe patient can cause enormous economic loss, produces abominable social influence.Therefore, the shearing strength test for fluid sealant and concrete interface is necessary in fact.
Summary of the invention
The objective of the invention is to, provide a kind of fluid sealant with by the method for testing of bonded substrate bonding sample interface shearing strength.
In order to realize above-mentioned task, the present invention takes following technical solution:
A kind of fluid sealant with by the method for testing of bonded substrate bonding sample interface shearing strength, it is characterized in that, comprise the following steps:
Step 3 during test, applies normal pressure P for last shear box
1, apply horizontal force P for simultaneously down cut box one side
2, guaranteeing that the suffered power of sample bonding interface all is shearing force, when being broken away from fully by sticking base material and fluid sealant, the full-scale reading on the dynamometer be fluid sealant with by bonded substrate bonding interface shearing-resistance shear force.Is exactly at normal pressure P with this anti-shearing force divided by the bonding sample interface area
1Following to the shearing strength of sticking base material and fluid sealant bonding interface.
Method of the present invention can test fluid sealant with by the bonded substrate bonding sample interface shearing strength, simple to operate, easy to use, need not to increase new equipment, be convenient to promote.The shearing strength of any composite structure can be provided, concrete engineering practice had very strong directiveness, especially simulate Concrete Construction seam and expansion joint shear behaviors such as reservoir dam facing in the hydraulic engineering, channel expansion joint, aqueduct expansion joints, pipeline expansion joint, have bigger engineering significance.
Description of drawings
Fig. 1 be fluid sealant with by the test synoptic diagram of bonded substrate bonding sample interface shearing strength.
The present invention is described in further detail below in conjunction with accompanying drawing.
Embodiment
Referring to Fig. 1, according to technical scheme of the present invention, to be made two round samples by sticking base material 2 (concrete) earlier, the middle seam chamber shown among the figure 3 of reserving certain size, fluid sealant is poured into, making by sticking base material 2 and fluid sealant 3 becomes a bonding sample integral body, is placed on 20 ± 2 ℃ of temperature, and maintenance is 28 days in the environment of relative humidity 65 ± 5%;
The sticking base material 2 of the quilt of bonding sample is placed on respectively in shear box 1 and the down cut box 4, and fluid sealant 3 is exposed, and wherein, last shear box 1 one sides are connected with dynamometer 5, and these dynamometer 5 bottoms are provided with pulley 6; The bottom of down cut box 4 is provided with pulley 6 equally;
During test, apply normal pressure P on the top of last shear box 1
1, can guarantee horizontal force P like this
2All act on by on the bonding sample interface of sticking base material 2 and fluid sealant 3.Measure by the suffered shearing force of bonding sample interface of sticking base material 2 and fluid sealant 3 with dynamometer 5.Simultaneously apply horizontal force P with certain rate of loading
2, down cut box 4 is at horizontal force P
2Effect under move horizontally, when being broken away from by the bonding sample interface of sticking base material 2 and fluid sealant 3 or destroying, dynamometer 5 measured maximum, force promptly are anti-shearing forces, are exactly at normal pressure P with this anti-shearing force divided by the bonding sample interface area
1Following to the shearing strength of sticking base material and fluid sealant bonding interface.
Above-mentioned fluid sealant be the polyurethane sealant, polysulfide sealant, acrylate construction sealant, silicone building sealant, fly ash synthesized channel joint impervious material of liquid state or paste and the conventional fluid sealant that is used for concrete bonding wherein any.
Above-mentioned polyurethane sealant, polysulfide sealant, acrylate construction sealant should meet the technical standard requirement of regulation among JC/T482-2003 " polyurethane sealant ", JC/T483-2003 " poly-sulphur building sealant ", JC/T484-2006 " acrylate building sealant ", the GB/T14683-2003 " silicone building sealant " respectively.
Fly ash synthesized channel joint impervious material is for obtaining a kind of material of national inventing patent, the patent No.: ZL200310118992.X, its performance satisfies every technical standard requirement among the JC/T482-2003 " polyurethane sealant ", satisfies every technical standard requirement among the JC/T881-2001 " concrete construction seam fluid sealant " simultaneously.
Concrete 2 can be smeared end agent with the bonding interface of fluid sealant 3, also can not deal with, and is as the criterion with model engineering actual state and concrete test objective.
By sticking base material can be concrete, mortar, solidified earth, brick, timber, glass, pottery, metal, rigid plastic or other materials, and the kind of being glued base material is as the criterion with model engineering actual state and concrete test objective.
Method of the present invention can be tested the interface shearing strength of bonding sample, and is simple to operate, easy to use, need not to increase new equipment, is convenient to promote.The shearing strength of any composite structure can be provided, concrete engineering practice had very strong directiveness, especially simulate Concrete Construction seam and expansion joint shear behaviors such as reservoir dam facing in the hydraulic engineering, channel expansion joint, aqueduct expansion joints, pipeline expansion joint, have bigger engineering significance.
Claims (4)
1, a kind of fluid sealant with by the method for testing of bonded substrate bonding sample interface shearing strength, it is characterized in that, comprise the following steps:
Step 1 is with being made two samples by sticking base material, two middle seam chambeies of reserving certain size of sample, fluid sealant is poured into the seam chamber, making by sticking base material and fluid sealant becomes a bonding sample integral body, is placed on 20 ± 2 ℃ of temperature, and maintenance is 28 days in the environment of relative humidity 65 ± 5%;
Step 2 is placed on the sticking base material of the quilt of sample respectively in shear box and the down cut box, and fluid sealant is exposed, and wherein, last shear box one side is connected with the dynamometry table of measuring shearing force, and this dynamometry table bottom is provided with pulley; The bottom of down cut box is provided with pulley equally;
Step 3 during test, applies normal pressure P for last shear box
1, apply horizontal force P for simultaneously down cut box one side
2To guarantee that the suffered power of sample bonding interface all is shearing force, when being broken away from fully by sticking base material and fluid sealant or destroying, the full-scale reading on the dynamometer is fluid sealant and by bonded substrate bonding interface shearing-resistance shear force, is exactly at normal pressure P with this anti-shearing force divided by the bonding sample interface area
1Following to the shearing strength of sticking base material and fluid sealant bonding interface.
2, the method for claim 1 is characterized in that, the shape of described sample is right cylinder or rectangular parallelepiped or square.
3, the method for claim 1, it is characterized in that, described fluid sealant be the polyurethane sealant, polysulfide sealant, acrylate construction sealant, silicone building sealant, fly ash synthesized channel joint impervious material of liquid state or paste and the conventional fluid sealant that is used for concrete bonding wherein any.
4, the method for claim 1 is characterized in that, described is wherein a kind of of concrete, mortar, solidified earth, brick, timber, glass, pottery, metal, rigid plastic by sticking base material.
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CN2009100211637A CN101509868B (en) | 2009-02-18 | 2009-02-18 | Interface shearing strength test method for adhesive bonding sample of sealant and substrate |
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