CN109682293A - Determination method with rib material enhancing cement-base composite material structure protective layer thickness - Google Patents
Determination method with rib material enhancing cement-base composite material structure protective layer thickness Download PDFInfo
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- CN109682293A CN109682293A CN201811478907.3A CN201811478907A CN109682293A CN 109682293 A CN109682293 A CN 109682293A CN 201811478907 A CN201811478907 A CN 201811478907A CN 109682293 A CN109682293 A CN 109682293A
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- cement
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- base composite
- protective layer
- layer thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
- G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
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Abstract
The present invention discloses a kind of determination method with rib material enhancing cement-base composite material structure protective layer thickness, includes the following steps: step 1, and the bond and anchor property test band rib material used for preparing different protective layer thickness enhances cement-base composite material test block；Step 2, measuring point is arranged along muscle material anchoring direction in cement-base composite material test block surface, in point position fixed resistance foil gauge；Step 3, muscle material pull-out test is carried out, the data variation of each measuring point resistance strain gage on the cement-base composite material of different protective layer thickness is obtained by digital collection instrument, determines therefrom that reasonable protective layer thickness.The present invention is in band rib material anchoring property experimental basis Nian Jie with cement-base composite material; it can determine the reasonable protective layer thickness for meeting engineering demand according to foil gauge reading variation during test; this method is simple to operation; and it is at low cost, the determination for muscle material protective layer thickness in structure design provides technical support.
Description
Technical field
The present invention relates to a kind of determination methods with rib material enhancing cement-base composite material structure protective layer thickness, belong to
Building structure determination techniques field.
Background technique
Protective layer is arranged in Structural Engineering can not only guarantee the adhesive property of cement-base composite material and muscle material, but also
The intrusion of harmful environmental ion can be prevented, muscle material is protected, improves the durability of structure.When cement-based material and muscle material bear curved drawing
When load, the rib on muscle material surface cement-based material protective layer to around generates squeezing action in draw-texture process, if protected
Covering thickness is insufficient, cracks in the squeezing action lower protective layer of muscle material rib, leads to the caking property of muscle material and cement-base composite material
It can reduce, influence the service life of structure.Although protective layer thickness is bigger, the adhesive property of cement-base composite material and muscle material is got over
Excellent but excessive protective layer thickness can reduce the effective height of muscle material enhancing cement-base composite material member section, reduce structure
The bearing capacity of part influences the normal use of structure.Therefore reasonable design protection thickness degree designs structure most important.
Currently, many scholars are dedicated to studying for example high ductility cement-base composite material of various novel cement-base composite materials
Deng, and some cement-base composite materials are gradually applied in Practical Project.But for cement-base composite material protective layer
It is arranged referring still to protective layer thickness (the Cui Leitao .PVA fiber reinforced cement-based composite material bridge floor company in concrete related specifications
Application and research [D] master thesis of fishplate bar, Hebei University of Technology, Tianjin, 2012.), novel concrete based composites
Whether protective layer thickness meets engineering demand, lacks research.Therefore, there is an urgent need to find a kind of simple and inexpensive method
Determine the protective layer thickness with rib material enhancing cement-base composite material structure.
Summary of the invention
Goal of the invention: for the determination side lacked in the prior art for cement-base composite material protective layer setting thickness
Method, the present invention provide a kind of determination method with rib material enhancing cement-base composite material structure protective layer thickness.
Technical solution: the determination side of the present invention with rib material enhancing cement-base composite material structure protective layer thickness
Method includes the following steps:
Step 1, the bond and anchor property test band rib material enhancing cement base used for preparing different protective layer thickness is compound
Material test block；
Step 2, measuring point is arranged along muscle material anchoring direction in the cement-base composite material test block surface, it is solid in point position
Determine resistance strain gage；
Step 3, muscle material pull-out test is carried out, the cement base composite wood of different protective layer thickness is obtained by digital collection instrument
The data variation of each measuring point resistance strain gage, determines therefrom that reasonable protective layer thickness on material.
In band rib material enhancing cement-base composite material of the present invention, band rib material is fiber reinforced polymeric with ribbing
Object, fiber-reinforced polymer with ribbing include glass fiber reinforced polymer with ribbing, Ribbed Bar, aramid fiber with ribbing enhancing polymerization
Object, basalt fiber-reinforced polymer with ribbing and carbon fiber reinforced polymer with ribbing etc..Cement-base composite material can be selected from activity
Powder concrete, fiber reinforced cement-based composite material, high ductility cement-base composite material, the flexible cement base of high tenacity are compound
One or more of strong superelevation ductility cement-base composite material of material, superelevation etc..
In above-mentioned steps 2, the length of resistance strain gage should be greater than the maximum particle diameter size of cement-base composite material.Wherein,
The loading end of drawing load when the measuring point of arrangement includes at least pull-out test, the intermediate position of cement-base composite material test block and not
At the free end three of loaded load.
Preferably, step 2 specifically may include following processes:
Step 21, along muscle material anchoring direction polishing on the cement-base composite material test block surface, mark signature line is true
Determine the point position of foil gauge；
Step 22, in the cross hairs center adhering resistance strain sheets of each measuring point, and light piezoresistance foil gauge repeatedly, make
Its stickup is smooth, and pastes connecting terminal by the resistance strain gage；
Step 23, weld strain piece seal wire and conducting wire on connecting terminal, and the resistance of test resistance foil gauge, inspection are led
Whether wire bonding is qualified.
In above-mentioned steps 22, the distance between resistance strain gage and connecting terminal at each measuring point are preferably equal to or greater than
3mm prevents from welding written scaling loss foil gauge in welding process.It adhering resistance can be strained in such a way that this is in point position brush coating water
Piece, glue are the liquid glue of one-component or bi-component, such as AB glue, 502 glue or epoxy resin.
In above-mentioned steps 3, frequency acquisition one of the frequency acquisition of data collecting instrument preferably with drawing load when pull-out test
It causes, data processing can be facilitated.Wherein, the method for Reasonable Protection thickness degree being determined according to resistance strain gage data variation are as follows: when certain
Under one protective layer thickness, when the data of resistance strain gage are substantially unchanged at each measuring point in cement-base composite material test block, the guarantor
Covering thickness is the minimal protective cover thickness for the condition that meets.
The utility model has the advantages that compared with the prior art, the advantages of the present invention are as follows the present invention is compound in band rib material and cement base
Material be bonded anchoring property experimental basis on, using test block surface paste foil gauge, according to muscle material pull-out test during answer
Becoming piece reading variation can determine the reasonable protective layer thickness for meeting engineering demand, and this method is simple to operation, and cost
Low, the determination for muscle material protective layer thickness in structure design provides technical support.
Detailed description of the invention
Fig. 1 is that muscle material and cement-base composite material bond and anchor property are tested test block surface strain gauge adhesion used and illustrated
Figure；
Fig. 2 is the structure size schematic diagram of cement-base composite material test block surface foil gauge and connecting terminal；
When Fig. 3 is that protective layer thickness c is 15mm, 25mm, 35mm in example 1, high ductility cement-base composite material test block table
Face diagram of strains；
When Fig. 4 is that protective layer thickness c is 25mm, 35mm, 45mm in example 2, fiber reinforced cement-based composite material test block
Surface strain distribution map；
When Fig. 5 is that protective layer thickness c is 35mm, 45mm, 55mm in example 3, the strong superelevation ductility cement base composite wood of superelevation
Expect test block surface diagram of strains.
Specific embodiment
Technical solution of the present invention is described further with reference to the accompanying drawing.
Determination method with rib material enhancing cement-base composite material structure protective layer thickness of the invention, including walk as follows
It is rapid:
Step 1, the bond and anchor property test band rib material enhancing cement base used for preparing different protective layer thickness is compound
Material test block, such as Fig. 1, wherein band rib material 1 is fiber-reinforced polymer with ribbing, including glass fiber reinforced polymer with ribbing
(GFRP tendons), Ribbed Bar, aramid fiber with ribbing enhance polymer (AFRP tendons), basalt fiber-reinforced polymer with ribbing
(BFRP tendons) and carbon fiber reinforced polymer with ribbing (CFRP tendons) etc.；Cement-base composite material 2 is selected from Reactive Powder Concrete, fibre
Dimension enhancing cement-base composite material, high ductility cement-base composite material, the flexible cement-base composite material of high tenacity, superelevation surpass by force
One or more of high ductility cement-base composite material etc.；
Step 2, measuring point is arranged along muscle material anchoring direction in cement-base composite material test block surface, in the fixed electricity of point position
Hinder foil gauge；Specific step is as follows:
Step 21, along muscle material anchoring direction polishing on cement-base composite material test block surface, the determination of mark signature line is answered
Become the point position of piece；Loading end 3, the cement-base composite material examination of drawing load when the measuring point of arrangement includes at least pull-out test
At the intermediate position 4 of block and the free end 5 three of non-loaded load；
It step 22, such as can be by point position brush coating in the cross hairs center adhering resistance strain sheets 6 of each measuring point
The mode adhering resistance strain sheets of water, glue are the liquid glue of one-component or bi-component, such as AB glue, 502 glue or epoxy resin；
Light piezoresistance foil gauge 6 repeatedly after stickup, drives bubble etc. away, pastes resistance strain gage 6 smooth, and in the resistance strain gage 6
Paste connecting terminal 7 in side；
In this step, according to the length a of the maximum particle diameter selection resistance strain gage of material in cement-base composite material (as schemed
2), the length of resistance strain gage 6 should be greater than the maximum particle diameter size of cement-base composite material 2.To avoid welding pen in welding process
Head scaling loss foil gauge 6, the distance between resistance strain gage 6 and connecting terminal 7 at each measuring point b are preferably equal to or greater than 3mm.
Step 23, weld strain piece seal wire and conducting wire on connecting terminal, and the resistance of test resistance foil gauge, inspection are led
Whether wire bonding is qualified.
Step 3, muscle material pull-out test is carried out, foil gauge conducting wire can be connected on digital collection instrument, pass through digital collection
Instrument obtains the data variation of each measuring point resistance strain gage on the cement-base composite material of different protective layer thickness, determines therefrom that rationally
Protective layer thickness；Specifically, when under a certain protective layer thickness, the resistance-strain of each measuring point in cement-base composite material test block
When the data of piece are substantially unchanged, which is the minimal protective cover thickness for the condition that meets.
The frequency acquisition of data collecting instrument is preferably consistent with the frequency acquisition of drawing load when pull-out test, can facilitate data
Processing.
Embodiment 1
The present embodiment is determined by taking the high ductility cement-base composite material enhanced with rib material as an example using method of the invention
Its protective layer thickness.
Specific experiment step are as follows:
1) it prepares and is bonded between reinforcing bar 1 and high ductility cement-base composite material 2 when protective layer thickness is 15mm, 25mm, 35mm
Test block used in anchoring property, and conserve to regulation age；
2) fibre length of high ductility cement-base composite material 2 is 12mm, and the resistance of model BX120-20AA is selected to answer
Become piece 6, length a is 20mm；
3) direction polishing is anchored along reinforcing bar 1 on high 2 surface of ductility cement-base composite material test block, mark signature line determines
The point position of foil gauge 6: position 4 and test block free end 5 among drawing load loading end 3, test block；
4) in loading end 3, intermediate position 4 and 5 position brush AB glue of free end, foil gauge 6 is pasted in cross hairs center,
And light compressive strain piece 6 repeatedly, it drives bubble etc. away, guarantees that foil gauge 6 is pasted smooth, and be that the place 5mm is viscous from 6 distance b of foil gauge
Amplexiform line terminals 7；
5) after 7 firm pasting of foil gauge 6 and connecting terminal, weld strain piece seal wire and conducting wire on connecting terminal 7, and
Strain sheet resistance is tested with multimeter, checks whether conducting wire welding is qualified；
6) AB glue sealed connecting terminal 7 and foil gauge 6 are used, prevents high ductility cement-base composite material test block 2 from carrying
Foil gauge 6 damages in journey；
7) when carrying out 1 pull-out test of reinforcing bar, conducting wire is connected on digital collection instrument, and the frequency acquisition of Acquisition Instrument is set
It is consistent with the frequency acquisition of drawing load, facilitate data processing；
8) according to the data variation of foil gauge when protective layer thickness 15mm, 25mm, 35mm, reasonable protection thickness is determined
Degree.
Test result such as Fig. 3, from the figure 3, it may be seen that test block surface foil gauge data variation is more when protective layer thickness is 15mm
Obviously, and protective layer thickness be 25mm and 35mm when, test block surface strain sheet data it is substantially unchanged, therefore can determine reinforcing bar increase
The minimal protective cover thickness of strong high ductility cement-base composite material is 25mm.
Embodiment 2
The present embodiment determines it by taking BFRP tendons fiber reinforced cement-based composite material with ribbing as an example, using method of the invention
Protective layer thickness.
Specific implementation step are as follows:
1) BFRP tendons 1 with ribbing and fiber reinforced cement-based composite material when protective layer thickness is 25mm, 35mm, 45mm are prepared
Test block used in 2 bond and anchor properties, and conserve to regulation age；
2) fibre length of fiber reinforced cement-based composite material 2 is 10mm, selects the resistance of model BX120-15AA
Foil gauge 6, length 15mm；
3) direction polishing, mark signature line are anchored along BFRP tendons 1 on 2 surface of fiber reinforced cement-based composite material test block
Determine the point position of foil gauge 6: position 4 and test block free end 5 among drawing load loading end 3, test block；
4) 502 glue are brushed at loading end 3, intermediate position 4 and 5 position of free end, pastes foil gauge in cross hairs center
6, and light compressive strain piece 6 repeatedly, it drives bubble etc. away, guarantees that foil gauge 6 is pasted smooth, and be at 10mm from 6 distance b of foil gauge
Paste connecting terminal 7；
5) after 7 firm pasting of foil gauge 6 and connecting terminal, weld strain piece seal wire and conducting wire on connecting terminal 7, and
Strain sheet resistance is tested with multimeter, checks whether conducting wire welding is qualified；
6) AB glue sealed connecting terminal 7 and foil gauge 6 are used, prevents fiber reinforced cement-based composite material test block 2 from carrying
Foil gauge 6 damages in the process；
7) when carrying out 1 pull-out test of BFRP tendons, conducting wire is connected on digital collection instrument, and the acquisition frequency of Acquisition Instrument is set
Rate is consistent with the frequency acquisition of drawing load, facilitates data processing；
8) according to the data variation of foil gauge when protective layer thickness 25mm, 35mm, 45mm, reasonable protection thickness is determined
Degree.
Test result such as Fig. 4, as shown in Figure 4, when protective layer thickness is 25mm and 35mm, test block surface strains sheet data and becomes
Change more obvious, and when protective layer thickness is 45mm, it is substantially unchanged that test block surface strains sheet data, therefore can determine with ribbing
The minimal protective cover thickness that BFRP tendons reinforcing fiber enhances cement-base composite material is 45mm.
Embodiment 3
The present embodiment is by taking the strong superelevation ductility cement-base composite material of GFRP tendons superelevation with ribbing as an example, using method of the invention
Determine its protective layer thickness.
1) it is multiple that GFRP tendons 1 and the strong superelevation ductility cement base of superelevation with ribbing when protective layer thickness is 35mm, 45mm, 55mm are prepared
Test block used in 2 bond and anchor properties of condensation material, and conserve to regulation age；
2) fibre length of the strong superelevation ductility cement-base composite material 2 of superelevation is 15mm, selects model BX120-25AA
Resistance strain gage 6, length 25mm；
3) direction polishing is anchored along GFRP tendons 1 on strong 2 surface of superelevation ductility cement-base composite material test block of superelevation, drawn
Cross hairs determines the point position of foil gauge 6: position 4 and test block free end 5 among drawing load loading end 3, test block；
4) it in loading end 3, intermediate position 4 and 5 position brush epoxy resin of free end, pastes and strains in cross hairs center
Piece 6, and light compressive strain piece 6 repeatedly, drive bubble etc. away, guarantee that foil gauge 6 is pasted smooth, and are being 7mm from 6 distance b of foil gauge
Paste connecting terminal 7 in place；
5) after 7 firm pasting of foil gauge 6 and connecting terminal, weld strain piece seal wire and conducting wire on connecting terminal 7, and
Strain sheet resistance is tested with multimeter, checks whether conducting wire welding is qualified；
6) epoxy resin sealed connecting terminal 7 and foil gauge 6 are used, the strong superelevation ductility cement-base composite material examination of superelevation is prevented
Foil gauge 6 damages block 2 in the handling process；
7) when carrying out 1 pull-out test of GFRP tendons, conducting wire is connected on digital collection instrument, and the acquisition frequency of Acquisition Instrument is set
Rate is consistent with the frequency acquisition of drawing load, facilitates data processing；
8) according to the data variation of foil gauge when protective layer thickness 35mm, 45mm, 55mm, reasonable protection thickness is determined
Degree.
Test result such as Fig. 5, as shown in Figure 5, when protective layer thickness is 35mm and 45mm, test block surface strains sheet data and becomes
Change more obvious, and when protective layer thickness is 55mm, it is substantially unchanged that test block surface strains sheet data, therefore can determine with ribbing
The minimal protective cover thickness of the strong superelevation ductility cement-base composite material of GFRP tendons superelevation is 55mm.
Claims (10)
1. a kind of determination method with rib material enhancing cement-base composite material structure protective layer thickness, which is characterized in that including
Following step:
Step 1, the bond and anchor property test band rib material used for preparing different protective layer thickness enhances cement-base composite material
Test block；
Step 2, measuring point is arranged along muscle material anchoring direction in the cement-base composite material test block surface, in the fixed electricity of point position
Hinder foil gauge；
Step 3, muscle material pull-out test is carried out, on the cement-base composite material that different protective layer thickness are obtained by digital collection instrument
The data variation of each measuring point resistance strain gage, determines therefrom that reasonable protective layer thickness.
2. the determination method according to claim 1 with rib material enhancing cement-base composite material structure protective layer thickness,
It is characterized in that, the band rib material is fiber-reinforced polymer with ribbing, which includes band ribbed glass
Fiber-reinforced polymer, Ribbed Bar, aramid fiber with ribbing enhancing polymer, basalt fiber-reinforced polymer with ribbing and with ribbing
Carbon fiber reinforced polymer.
3. the determination method according to claim 1 with rib material enhancing cement-base composite material structure protective layer thickness,
It is characterized in that, the cement-base composite material is selected from Reactive Powder Concrete, fiber reinforced cement-based composite material, high ductility
One in the strong superelevation ductility cement-base composite material of the flexible cement-base composite material of cement-base composite material, high tenacity, superelevation
Kind is several.
4. the determination method according to claim 1 with rib material enhancing cement-base composite material structure protective layer thickness,
It is characterized in that, the length of the resistance strain gage is greater than the maximum particle diameter size of cement-base composite material in step 2.
5. the determination method according to claim 1 with rib material enhancing cement-base composite material structure protective layer thickness,
It is characterized in that, in step 2, loading end, the cement-base composite material of drawing load when the measuring point includes at least pull-out test
The intermediate position of test block and the free end of non-loaded load.
6. the determination method according to claim 1 with rib material enhancing cement-base composite material structure protective layer thickness,
It is characterized in that, step 2 specifically includes following processes:
Step 21, along muscle material anchoring direction polishing on the cement-base composite material test block surface, the determination of mark signature line is answered
Become the point position of piece；
Step 22, in the cross hairs center adhering resistance strain sheets of each measuring point, and light piezoresistance foil gauge repeatedly, keep it viscous
It develops whole, and pastes connecting terminal by the resistance strain gage；
Step 23, weld strain piece seal wire and conducting wire on connecting terminal, and the resistance of test resistance foil gauge check conducting wire weldering
Whether connect qualified.
7. the determination method according to claim 6 with rib material enhancing cement-base composite material structure protective layer thickness,
It is characterized in that, the distance between resistance strain gage and connecting terminal at each measuring point are more than or equal to 3mm in step 22.
8. the determination method according to claim 6 with rib material enhancing cement-base composite material structure protective layer thickness,
It is characterized in that, in point position brush coating water, adhering resistance strain sheets, the glue is one-component or bi-component in step 22
Liquid glue.
9. the determination method according to claim 1 with rib material enhancing cement-base composite material structure protective layer thickness,
It is characterized in that, in step 3, the frequency acquisition one of drawing load when the frequency acquisition and pull-out test of the data collecting instrument
It causes.
10. the determination method according to claim 1 with rib material enhancing cement-base composite material structure protective layer thickness,
It is characterized in that, in step 3, the method that Reasonable Protection thickness degree is determined according to resistance strain gage data variation are as follows: when certain
Under one protective layer thickness, when the data of resistance strain gage are substantially unchanged at each measuring point in cement-base composite material test block, the guarantor
Covering thickness is the minimal protective cover thickness for the condition that meets.
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| CN109682293B (en) | 2020-05-19 |
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