CN107795071A - A kind of non-adhesive superhigh tenacity cement-base composite material functionally gradient beam and method - Google Patents
A kind of non-adhesive superhigh tenacity cement-base composite material functionally gradient beam and method Download PDFInfo
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- CN107795071A CN107795071A CN201711099386.6A CN201711099386A CN107795071A CN 107795071 A CN107795071 A CN 107795071A CN 201711099386 A CN201711099386 A CN 201711099386A CN 107795071 A CN107795071 A CN 107795071A
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- 239000002131 composite material Substances 0.000 title claims abstract description 114
- 239000000853 adhesive Substances 0.000 title claims abstract description 16
- 230000001070 adhesive effect Effects 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title abstract description 12
- 239000010410 layer Substances 0.000 claims abstract description 76
- 239000004567 concrete Substances 0.000 claims abstract description 64
- 239000011241 protective layer Substances 0.000 claims abstract description 38
- 239000000835 fiber Substances 0.000 claims abstract description 21
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 15
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- 238000012545 processing Methods 0.000 claims abstract description 15
- 238000000926 separation method Methods 0.000 claims abstract description 15
- 230000003014 reinforcing effect Effects 0.000 claims description 30
- 239000004568 cement Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 14
- 238000005266 casting Methods 0.000 claims description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 8
- 239000010881 fly ash Substances 0.000 claims description 8
- 239000010959 steel Substances 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 7
- 239000006004 Quartz sand Substances 0.000 claims description 6
- 238000012423 maintenance Methods 0.000 claims description 6
- 238000002360 preparation method Methods 0.000 claims description 6
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 239000002689 soil Substances 0.000 claims description 5
- 238000000465 moulding Methods 0.000 claims description 4
- 210000003205 muscle Anatomy 0.000 claims description 4
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- 238000003756 stirring Methods 0.000 claims description 4
- 239000002562 thickening agent Substances 0.000 claims description 4
- 238000007667 floating Methods 0.000 claims description 3
- 238000009415 formwork Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 239000002023 wood Substances 0.000 claims description 3
- 150000001875 compounds Chemical class 0.000 claims description 2
- 238000009833 condensation Methods 0.000 claims description 2
- 230000005494 condensation Effects 0.000 claims description 2
- 239000011229 interlayer Substances 0.000 abstract description 4
- 239000010408 film Substances 0.000 description 13
- 230000007797 corrosion Effects 0.000 description 11
- 238000005260 corrosion Methods 0.000 description 11
- 230000009471 action Effects 0.000 description 7
- 239000011150 reinforced concrete Substances 0.000 description 5
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- 238000001764 infiltration Methods 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 241000370738 Chlorion Species 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
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- 239000004566 building material Substances 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
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- 238000011065 in-situ storage Methods 0.000 description 1
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/02—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces
- E04C3/20—Joists; Girders, trusses, or trusslike structures, e.g. prefabricated; Lintels; Transoms; Braces of concrete or other stone-like material, e.g. with reinforcements or tensioning members
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Architecture (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Rod-Shaped Construction Members (AREA)
Abstract
The invention discloses a kind of non-adhesive superhigh tenacity cement-base composite material functionally gradient beam and method; it solves the problems, such as effectively to control for the fracture width of beams of concrete in the prior art; pass through specific interface processing; concrete layer and superhigh tenacity cement-base composite material protective layer are subjected to interlaminar separation; interlayer adhesion problem is eliminated, makes relative to slide for two layers, avoids the generation of macrocrack; effectively suppress fracture width extension, its technical scheme is：The concrete layer and superhigh tenacity cement-base composite material protective layer being provided adjacent to including upper lower leaf; film separation layer is set at the interface of concrete layer and superhigh tenacity the cement-base composite material layer, carbon fibre web is set inside the superhigh tenacity cement-base composite material layer.
Description
Technical field
The present invention relates to building material technical field, more particularly to a kind of non-adhesive superhigh tenacity cement base composite wood
Expect functionally gradient beam and method.
Background technology
At present, reinforced concrete structure directly affects engineering safety, economy and durability in building trade extensive use
Energy.For reinforced concrete structure, carbon dioxide, vapor, oxygen and chlorion in ambient atmosphere etc. once enter
To inside concrete, and the position where reinforcing bar is reached, steel bar corrosion can be caused, and then cause the mistake of reinforced concrete structure
Effect.To prevent steel bar corrosion, the measure being usually taken is that 30mm -40mm protective layer is set on the outside of reinforcing bar.But due to coagulation
The defects of soil itself, such as tensile strength is low, anti-crack ability is poor, fragility is big, and under load action, the cracking of protective layer is almost
It is unavoidable.Once larger crack occurs in protective layer, harmful substance enters inside concrete, Jiu Huizao in ambient atmosphere
Into steel bar corrosion.Existing numerous studies show that the corrosion ratio of reinforcing bar is relevant with the speed that harmful substance penetrates into concrete component.
And under same protective layer thickness and environmental condition, fracture width is bigger, and reinforcing bar is more easy to corrosion.Therefore, to prevent steel
Muscle corrosion, the durability of structure is improved, how to control the fracture width of protective layer is the key solved the problems, such as.
Functionally gradient this concept is undoubtedly a kind of effective and feasible method for cement-based material to improve its performance.
Many scientific workers have done substantial amounts of research work for this, such as, Maalej etc. proposes to be answered using superhigh tenacity cement base
Condensation material replaces this theory of the concrete in the range of each one times of protective layer thickness in tensile region reinforcing bar both sides, and has carried out correlation
Experimental study.Superhigh tenacity cement-base composite material is to lead University of Michigan by Univ Michigan-Ann Arbor USA Li V professors C earliest
Advanced civil engineering material research laboratory is researched and developed.Experimental study finds that this kind of composite is either stretching
Or obvious strain hardening feature is all shown under bending load effect, can be by conventional cement sill under anti-stretching load
Macroscopical cracking model of single crackle is converted into the microcraking pattern of a plurality of fine and closely woven crackle, has the toughness of highly significant and excellent
Good durability.In recent years, application of the superhigh tenacity cement-base composite material functionally gradient beam in concrete structure field is also got over
More to cause the attention of the numerous researchers in China, for example, Xu Shi Lang team takes the lead in having carried out superhigh tenacity composite control and split
The research work of functionally gradient composite beam flexural property, functionally gradient composite beam is split to superhigh tenacity composite control and is entirely being added
Internal force change and crack progressing during load have carried out Associated.Li Zhi China of Yangzhou University et al. proposes a kind of special boundary
The high tensile reinforcement functionally gradient beams of concrete of face form, for eliminating the weak area of interface discontinuity.
But for above-mentioned superhigh tenacity cement-base composite material functionally gradient beam, its concrete layer and superelevation are tough
Property cement-base composite material protective layer is to be bonded as an entirety, can not relative motion between two layers.Under load action, two
The common stress of layer, still occurs locality crack concentration phenomenon, and larger macrocrack also occurs on the protection layer, so as to
The excellent ductility of superhigh tenacity cement-base composite material can not be made full use of, it is impossible to effective control critical eigenvalue width, resist steel
The corrosion of muscle, and then influence the endurance quality of structure.
In summary, the problem of can not effectively being controlled for the fracture width of beams of concrete in the prior art, still lacking has
The solution of effect.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the invention provides a kind of non-adhesive superhigh tenacity cement base is compound
Material function gradient beam, by specific interface processing, concrete layer and superhigh tenacity cement-base composite material protective layer are entered
Row interlaminar separation, interlayer adhesion problem is eliminated, make relative to slide for two layers, avoided the generation of macrocrack, effectively suppress crack
Width extends；
Further, the present invention uses following technical proposals：
A kind of non-adhesive superhigh tenacity cement-base composite material functionally gradient beam, including upper lower leaf be provided adjacent to it is mixed
Solidifying soil layer and superhigh tenacity cement-base composite material protective layer, concrete layer and superhigh tenacity the cement-base composite material layer
Film separation layer is set at interface, carbon fibre web is set inside the superhigh tenacity cement-base composite material layer.
Further, the superhigh tenacity cement-base composite material protective layer both ends set anchored end.
Further, the height of the anchored end is higher than the height of superhigh tenacity cement-base composite material protective layer.
Further, the anchored end and superhigh tenacity cement-base composite material protective layer are made up of same material.
Further, the superhigh tenacity cement-base composite material protective layer and anchored end combination are in concave shape structure, institute
It is in the structure of falling type to state concrete layer, and the structural base of falling type both ends coordinate with anchored end.
Further, arrangement reinforcing bar inside the concrete layer.
Further, the steel-bar arrangement is in the lower convex portion for the structure of falling type.
Further, length direction of the carbon fibre web along superhigh tenacity cement-base composite material layer is laid.
The present invention provides a kind of making side of prefabricated non-adhesive superhigh tenacity cement-base composite material functionally gradient beam
Method, comprise the following steps：
The good reinforcing bar of colligation is placed in template；
Casting concrete, form concrete layer：The concrete prepared is poured into template, treats that concreting highly reaches
During to preset height, complete to pour；
Interface processing：The film laying separation layer at the transverse interface of concrete layer；
Prepare superhigh tenacity cement-base composite material；
Pour superhigh tenacity cement-base composite material：The superhigh tenacity cement-base composite material prepared is cast in template
Above middle concrete layer, when pouring to the half of setting height, carbon fibre web is laid, is continued to pour to reaching setting height.
Further, concretely comprising the following steps for superhigh tenacity cement-base composite material is prepared：
Load weighted cement, flyash, quartz sand and thickener are put into agitated kettle and are stirred to uniform；
Load weighted water and water reducer are added, is stirred 3-5 minutes, it is uniform to slurry；
PVA fibers are put into, stirs to hand and pinches mixture without fibrous caking phenomenon.
Further, after pouring superhigh tenacity cement-base composite material to setting height, vibrated, smeared with vibrating spear
It is flat, form removal after overlay film was conserved to setting age.
Further, the nominal diameter for always pouring height and being not less than reinforcing bar of the superhigh tenacity cement-base composite material.
The present invention provides a kind of making side of cast-in-place non-adhesive superhigh tenacity cement-base composite material functionally gradient beam
Method, comprise the following steps：
The reinforcing bar for needing to set in concrete layer is subjected to colligation；
Prepare superhigh tenacity cement-base composite material；
Pour superhigh tenacity cement-base composite material：The superhigh tenacity cement-base composite material formwork for placing that will be prepared
In, when pouring to the half of setting height, carbon fibre web is laid, is continued to pour to reaching setting height；
Interface processing：The film laying separation layer at the transverse interface of the superhigh tenacity cement-base composite material poured；
Casting concrete, form concrete layer：It is after the superhigh tenacity cement-base composite material final set poured, colligation is good
Reinforcing bar be placed in template, in a template above superhigh tenacity cement-base composite material casting concrete to being full of whole template,
Vibrate shaping；
Pouring the beam of scene maintenance final molding.
Compared with prior art, the beneficial effects of the invention are as follows：
The present invention is substituted mixed in the range of the protective layer thickness of tensile region reinforcing bar both sides with superhigh tenacity cement-base composite material
Solidifying soil, by using special interface processing (adding film separation layer), eliminates the bond stress between two layers, make two layers can
It is relative to slide, the generation of macrocrack can be avoided, effectively suppresses fracture width extension, resists the infiltration of water and harmful substance,
Protect reinforcing bar from corrosion, and then improve the durability of structure, extending structure service life.
The present invention sets carbon fibre web inside superhigh tenacity cement-base composite material layer, can strengthen superhigh tenacity cement
Based composites layer characteristic, while more excellent cracking resistance and control critical eigenvalue ability is obtained, it can also obtain higher carrying
Power.
By the present invention in that with anchoring piece by anchoring of the superhigh tenacity cement-base composite material at concrete layer both ends, by structure
The tension uniform that part tensile region is born under load action is delivered in superhigh tenacity cement-base composite material protective layer,
A large amount of fine and closely woven cracks are formed on superhigh tenacity cement-base composite material protective layer, avoid the generation of macrocrack.
Ability is split in the control that the method for the present invention can be obviously improved beam tensile region, all the time by control of crack width in relatively low water
It is flat, reduce the maintenance costs in life cycle management；Superhigh tenacity cement-base composite material layer can protect reinforcing bar from corrosion, carry
The durability of high structure, extending structure service life, reduce complete period expense；A large amount of flyash in superhigh tenacity material simultaneously
Using the dosage for reducing cement, be advantageous to green building and economize on resources；In addition, the functionally gradient beam is prepared simply, from one
Determine to save manpower and time in degree.
Brief description of the drawings
The Figure of description for forming the part of the application is used for providing further understanding of the present application, and the application's shows
Meaning property embodiment and its illustrate be used for explain the application, do not form the improper restriction to the application.
Fig. 1 is the main structure diagram of the functionally gradient beam of the present invention；
Fig. 2 is the side structure schematic view of the functionally gradient beam of the present invention；
Fig. 3 is load-mid-span deflection curve map that the present invention carries out the functionally gradient beam that interface processing obtains；
Fig. 4 is load-mid-span deflection curve map that the present invention does not carry out the functionally gradient beam that interface processing obtains；
In figure, 1, concrete layer；2nd, combination interface；3rd, superhigh tenacity cement-base composite material layer；4th, reinforcing bar；5th, carbon fiber
Net；6th, anchored end.
Embodiment
It is noted that described further below is all exemplary, it is intended to provides further instruction to the application.It is unless another
Indicate, all technologies used herein and scientific terminology are with usual with the application person of an ordinary skill in the technical field
The identical meanings of understanding.
It should be noted that term used herein above is merely to describe embodiment, and be not intended to restricted root
According to the illustrative embodiments of the application.As used herein, unless the context clearly indicates otherwise, otherwise singulative
It is also intended to include plural form, additionally, it should be understood that, when in this manual using term "comprising" and/or " bag
Include " when, it indicates existing characteristics, step, operation, device, component and/or combinations thereof.
As background technology is introduced, the fracture width existed in the prior art for beams of concrete can not be controlled effectively
The problem of, in order to solve technical problem as above, present applicant proposes a kind of non-adhesive superhigh tenacity cement-base composite material
Functionally gradient beam and method, it is intended to which how solution controls ordinary reinforced concrete structure protective layer splitting under normal operating condition
Slit width degree, the intrusion of hazardous medium is prevented, improve the durability of structure, extend service life.It is in ordinary reinforced concrete knot
On the basis of structure, the concept of functionally gradient beam is introduced, substituting tensile region reinforcing bar both sides with superhigh tenacity cement-base composite material protects
Concrete in the range of thickness degree, by using special interface processing (such as adding film class layer material), eliminate interlayer and glue
Knot problem, makes relative to slide for two layers.By anchoring of the superhigh tenacity cement-base composite material at concrete layer both ends, by component
The tension uniform that tensile region is born under load action is delivered in superhigh tenacity cement-base composite material protective layer, is utilized
Its excellent self-contr ol crack ability, equal thin of a large amount of spacing is formed on superhigh tenacity cement-base composite material protective layer
Crack, and then the generation of macrocrack is avoided, effectively suppress fracture width extension, resist the infiltration of water and harmful substance, protection
Reinforcing bar improves the durability of structure, extending structure service life from corrosion.
In a kind of typical embodiment of the application, as shown in Figure 1-2, there is provided a kind of non-adhesive superhigh tenacity water
Cement-based composite material functionally gradient beam, including the concrete layer 1 and superhigh tenacity cement base composite wood that upper lower leaf is provided adjacent to
(i.e. combination interface 2) sets film at the interface of material protective layer 3, concrete layer 1 and superhigh tenacity cement-base composite material layer 3
Separation layer, the inside of superhigh tenacity cement-base composite material layer 3 set carbon fibre web 5.
The both ends of superhigh tenacity cement-base composite material protective layer 3 set anchored end 6, and the height of anchored end 6 is higher than superelevation
The height of toughness cement-base composite material protective layer 3, anchored end 6 and superhigh tenacity cement-base composite material protective layer 3 are by same
Material is made, and 3 integral moulding by casting of anchored end 6 and superhigh tenacity cement-base composite material protective layer, is made by the setting of anchored end 6
Superhigh tenacity cement-base composite material protective layer 3 and the combination of anchored end 6 are in concave shape structure, and corresponding concrete layer 1 is in
Type structure, the structural base of falling type both ends coordinate with anchored end 6, lower convex portion and the superhigh tenacity cement base of the structure of falling type
The corresponding matching of composite protective layer 3 is set.
The inside of concrete layer 1 arrangement reinforcing bar 4, reinforcing bar 4 is tension reinforcement.
Reinforcing bar 4 is equipped with the lower convex portion of the structure of falling type of concrete layer 1.
Length direction of the carbon fibre web 5 along superhigh tenacity cement-base composite material layer 3 is laid.
The length direction of superhigh tenacity cement-base composite material layer 3 is the horizontal direction in Fig. 1 in the present invention, namely and steel
The axial direction of muscle 4 is consistent.
Be directed to it is prefabricated in the case of, the present invention provides a kind of non-adhesive superhigh tenacity cement-base composite material functionally gradient
The preparation method of beam, comprises the following steps：
The good reinforcing bar of colligation is placed in template；
Casting concrete, form concrete layer：The concrete prepared is poured into mould, treats that concreting highly reaches
During to preset height, complete to pour；
Interface processing：The film laying separation layer at the transverse interface of concrete layer；
Prepare superhigh tenacity cement-base composite material；
Pour superhigh tenacity cement-base composite material：The superhigh tenacity cement-base composite material prepared is cast in mould
Above middle concrete layer, when pouring to the half of setting height, carbon fibre web is laid, is continued to pour to reaching setting height.
Prepare concretely comprising the following steps for superhigh tenacity cement-base composite material：
Load weighted cement, flyash, quartz sand and thickener are put into agitated kettle and are stirred to uniform；
Load weighted water and water reducer are added, is stirred 3-5 minutes, it is uniform to slurry；
PVA fibers are put into, stirs to hand and pinches mixture without fibrous caking phenomenon.
After pouring superhigh tenacity cement-base composite material to setting height, vibrated with vibrating spear, floating, overlay film maintenance
Form removal after to setting age.
The height that always pours of superhigh tenacity cement-base composite material is not less than the nominal diameter of tension reinforcement, and should be not less than
Following provisions value：Ith, II and III (IV) environment category, respectively 30mm, 40mm and 45mm.
In the case of cast in situs, the present invention provides a kind of non-adhesive superhigh tenacity cement-base composite material function
The preparation method of gradient beam, comprises the following steps：
The reinforcing bar for needing to set in concrete layer is subjected to colligation；
Prepare superhigh tenacity cement-base composite material；
Pour superhigh tenacity cement-base composite material：The superhigh tenacity cement-base composite material formwork for placing that will be prepared
In, when pouring to the half of setting height, carbon fibre web is laid, continues to pour to setting height is reached, it pours thickness should
Not less than the nominal diameter of tension reinforcement, and following provisions value should be not less than：Ith, II and III (IV) environment category, it is respectively
30mm, 40mm and 45mm；
Interface processing：The film laying separation layer at the transverse interface of the superhigh tenacity cement-base composite material poured, point
From interface, interlayer adhesion problem is eliminated, makes relative to slide for two layers；Answered during laying it is smooth be placed on basal plane, keep away as far as possible
Exempt from fold；
Casting concrete, form concrete layer：It is after the superhigh tenacity cement-base composite material final set poured, colligation is good
Reinforcing bar be placed in template, in a template above superhigh tenacity cement-base composite material casting concrete to being full of whole template,
Vibrate shaping；
Pouring the beam of scene maintenance final molding.
In order that the technical scheme of the application can clearly be understood by obtaining those skilled in the art, below with reference to tool
The embodiment of body describes the technical scheme of the application in detail.
In the present embodiment, using preparing a kind of non-adhesive superhigh tenacity cement-base composite material functionally gradient in laboratory
The method of beam, is comprised the concrete steps that：
1) normal concrete is poured：The concrete prepared is poured into 400mm × 100mm × 100mm moulds, treats coagulation
When soil is poured into preset height, prefabricated reinforcing bar is put into concrete, makes reinforcing bar completely in concrete；Overlay film maintenance 6
Hour；
2) interface processing：After concreting 6 hours, in preset beam segment limit face, film laying class layer material is (i.e. thin
Film separation layer), the default beam section refers to that using the spaning middle section of beam be the beam section of symmetrical centre and its length as 360mm；
3) superhigh tenacity cement-base composite material is prepared：
1. in terms of every cubic metre, cement, flyash, quartz sand, water, the quality of additive and PVA fibers are respectively
593kg, 712kg, 473kg, 339kg, 6.09kg and 26kg, raw material is weighed according to aforementioned proportion；
2. load weighted solid constituent is put into dry mixing 2 in agitated kettle including cement, flyash, quartz sand and thickener to divide
Clock is to uniform；
3. adding load weighted water and water reducer, 3-5 minutes are stirred, uniformly and there is good mobility to slurry；
4. being put into PVA fibers, stir 6 minutes until hand pinches mixture without fibrous caking phenomenon；
4) superhigh tenacity cement-base composite material is poured：The superhigh tenacity cement-base composite material that step 3) prepares is fallen
Enter in the mould that step 2) is handled well, when the 1/2 of superhigh tenacity cement-base composite material thickness degree is poured into, stop pouring,
Then one layer of carbon fibre web is laid, continues to pour, is slightly vibrated with vibrating spear after the completion of pouring, floating, overlay film was conserved to 28 days
Form removal after age, that is, obtain non-adhesive superhigh tenacity cement-base composite material functionally gradient beam.
Functionally gradient beam size manufactured in the present embodiment is b × h × l=100mm × 100mm × 400mm, superhigh tenacity water
The height of cement-based composite material protective layer：1. the spaning middle section using beam is the beam section of symmetrical centre and its length as 360mm, it is high
Degree is 20mm；2. anchored end height is 50mm.
Normal concrete raw materials are as follows in the present embodiment：P.o.425 cement, I grade of flyash, river sand, 5mm-
20mm lime stone, high efficiency water reducing agent, running water, specific proportioning are shown in Table 1.
The concrete mix of table 1
Superhigh tenacity cement-base composite material raw materials are as follows in the present embodiment:P.o.425 cement, I grade of flyash,
Quartz sand, additive, running water, PVA chopped fibers, specific proportioning are shown in Table 2.
The superhigh tenacity cement-base composite material match ratio of table 2
The load for the functionally gradient beam that the present embodiment is prepared-mid-span deflection curve is as shown in Figure 3.The present embodiment system
Crack progressing situation of the standby obtained functionally gradient beam under load action is drawn can shoot photo after overtesting.
Embodiments herein is directed to, another comparative example is set：Prepared in the comparative example functionally gradient beam method and
Raw material used are same as the previously described embodiments, and difference is the full beam of superhigh tenacity cement-base composite material protective layer thickness
Duan Junwei 20mm, and without interface processing.
The load for the functionally gradient beam that the comparative example is prepared-mid-span deflection curve is as shown in Figure 4.It is prepared
Crack progressing situation of the functionally gradient beam under load action can also be drawn shooting photo after overtesting.
Shown by the related data and picture of the embodiment of the present invention and comparative example, non-adhesive made from the inventive method
Superhigh tenacity cement-base composite material functionally gradient beam, under load action, do not occur a large amount of fine and closely woven cracks on its protective layer, and not
Add on the protective layer of common superhigh tenacity cement-base composite material functionally gradient beam of separation layer (not carrying out interface processing)
Wide crack less, form striking contrast.Every concrete wide seam runs into superhigh tenacity cement-base composite material, all by
A plurality of fine cracks are dispersed into, effectively prevent the appearance of macrocrack on protective layer, have given full play to superhigh tenacity cement
Based composites can be all the time by control of crack width in the ability of reduced levels, and it is unfavorable in ambient atmosphere effectively to prevent
Factor enters component inside and reaches reinforcing bar, so as to largely avoid the generation of steel bar corrosion, significantly improves the durability of structure
Can, extending structure service life, reduce complete period expense.
The preferred embodiment of the application is the foregoing is only, is not limited to the application, for the skill of this area
For art personnel, the application can have various modifications and variations.It is all within spirit herein and principle, made any repair
Change, equivalent substitution, improvement etc., should be included within the protection domain of the application.
Claims (10)
1. a kind of non-adhesive superhigh tenacity cement-base composite material functionally gradient beam, it is characterized in that, including upper lower leaf adjoining
The concrete layer and superhigh tenacity cement-base composite material protective layer of setting, concrete layer and the superhigh tenacity cement base are compound
Film separation layer is set at the interface of material layer, carbon fibre web is set inside the superhigh tenacity cement-base composite material layer.
2. functionally gradient beam as claimed in claim 1, it is characterized in that, the superhigh tenacity cement-base composite material protective layer two
End set anchored end.
3. functionally gradient beam as claimed in claim 2, it is characterized in that, the height of the anchored end is higher than superhigh tenacity cement base
The height of composite protective layer；The anchored end and superhigh tenacity cement-base composite material protective layer are made up of same material.
4. functionally gradient beam as claimed in claim 2, it is characterized in that, the superhigh tenacity cement-base composite material protective layer and
Anchored end combination is in concave shape structure, and the concrete layer is in the structure of falling type, and the structural base of falling type both ends are matched somebody with somebody with anchored end
Close.
5. functionally gradient beam as claimed in claim 4, it is characterized in that, arrangement reinforcing bar inside the concrete layer；The reinforcing bar
It is arranged at the lower convex portion for the structure of falling type.
6. functionally gradient beam as claimed in claim 1, it is characterized in that, the carbon fibre web is along superhigh tenacity cement base composite wood
The length direction of the bed of material is laid.
7. the preparation method of the functionally gradient beam as described in claim any one of 1-6, it is characterized in that, comprise the following steps：
The good reinforcing bar of colligation is placed in template；
Casting concrete, form concrete layer：The concrete prepared is poured into template, treats that concreting highly reaches pre-
If during height, complete to pour；
Interface processing：The film laying separation layer at the transverse interface of concrete layer；
Prepare superhigh tenacity cement-base composite material；
Pour superhigh tenacity cement-base composite material：The superhigh tenacity cement-base composite material prepared is poured and mixed in a template
Above solidifying soil layer, when pouring to the half of setting height, carbon fibre web is laid, is continued to pour to reaching setting height.
8. the preparation method of the functionally gradient beam as described in claim any one of 1-6, it is characterized in that, comprise the following steps：
The reinforcing bar for needing to set in concrete layer is subjected to colligation；
Prepare superhigh tenacity cement-base composite material；
Pour superhigh tenacity cement-base composite material：By in the superhigh tenacity cement-base composite material formwork for placing prepared, treat
When pouring to the half of setting height, carbon fibre web is laid, is continued to pour to reaching setting height；
Interface processing：The film laying separation layer at the transverse interface of the superhigh tenacity cement-base composite material poured；
Casting concrete, form concrete layer：After the superhigh tenacity cement-base composite material final set poured, by the good steel of colligation
Muscle is placed in template, and casting concrete to whole template is full of, vibrates above superhigh tenacity cement-base composite material in a template
Shaping；
Pouring the beam of scene maintenance final molding.
9. the preparation method of functionally gradient beam as claimed in claim 7 or 8, it is characterized in that, prepare superhigh tenacity cement base and answer
Condensation material concretely comprises the following steps：
Load weighted cement, flyash, quartz sand and thickener are put into agitated kettle and are stirred to uniform；
Load weighted water and water reducer are added, is stirred 3-5 minutes, it is uniform to slurry；
PVA fibers are put into, stirs to hand and pinches mixture without fibrous caking phenomenon.
10. the preparation method of functionally gradient beam as claimed in claim 7 or 8, it is characterized in that,
After pouring superhigh tenacity cement-base composite material to setting height, vibrated with vibrating spear, floating, overlay film is conserved to setting
Determine form removal after age；The nominal diameter for always pouring height and being not less than reinforcing bar of the superhigh tenacity cement-base composite material.
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| CN109680871A (en) * | 2019-01-28 | 2019-04-26 | 山东大学 | A kind of compound cross-section simply supported beam and preparation method thereof |
| CN116597926A (en) * | 2023-06-02 | 2023-08-15 | 山东大学 | Design system and method for high-ductility cement-based repair material for dichotomy crack development |
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