CN101481930B - Construction structure for textile reinforced composite reinforced bar concrete and manufacturing method thereof - Google Patents

Construction structure for textile reinforced composite reinforced bar concrete and manufacturing method thereof Download PDF

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CN101481930B
CN101481930B CN2009100102589A CN200910010258A CN101481930B CN 101481930 B CN101481930 B CN 101481930B CN 2009100102589 A CN2009100102589 A CN 2009100102589A CN 200910010258 A CN200910010258 A CN 200910010258A CN 101481930 B CN101481930 B CN 101481930B
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concrete
knitted net
fiber knitted
fine
fiber
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CN2009100102589A
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CN101481930A (en
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徐世烺
尹世平
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大连理工大学
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The invention belongs to the technical field of concrete reinforcement, relating to utilizing fiber mesh grids to enhance the concrete strength. The arrangement of structural reinforcing steel, the thickness of concrete protective layers of main stress ribs and the grade of the concrete strength of the invention are designed according to the design criterion of a reinforced concrete structure. The invention is characterized in that before the initial setting of the concrete, fine concrete and the fiber mesh grids are cast on the outer side of the stretched and drawn area of the structure or the external surface of a large-scale integral structure, the total thickness of the fiber mesh grids and the fine concrete ranges from 10mm to 20mm, concrete with equal thickness of external surfaces are replaced, and the fiber mesh grids are evenly distributed in the fine concrete. The grid type or the plate type structure of the invention can adopt the structure of replacing partial reinforcing steel with the fiber mesh grids. The invention can effectively control cracks and solve the problems of concrete cracking and reinforcing steel corrosion, and has the advantages of firm bonding of the boundary surfaces of the fine concrete and the concrete, light self weight, low production cost, corrosion resistance, safe and durable usage, etc.

Description

Building structure of textile reinforced composite reinforced bar concrete and preparation method thereof
Technical field
The invention belongs to concrete enhancement techniques field, relate to and utilize the fiber knitted net enhancing concrete strength.
Background technology
Traditional reinforced concrete structure tends to serious major fracture occur at the region of high stress, and harsh environmental conditions can make corrosion of steel bar further aggravate.In order to guarantee that reinforcing bar is not corroded, need thicker protective layer thickness, like this with regard to the extra deadweight that increases structure.
The research center that DFG (Deutsche Forschungsgemeinschaft) supports was carried out fiber knitted net and is strengthened concrete (Textile Reinforced Concrete since 1999; Be called for short TRC) research; TRC is a kind of novel fiber reinforced cement-based composite material; Be the combination of multiaxis fiber knitted net and fine concrete, fiber knitted net is mainly used fibrages such as carbon fiber, aramid fiber, alkali-resistant glass fibre.The recent representative article in this research center is: 1) F.Jesse, N.Will, M.Curbach andJ.Hegger, Load-Bearing of Textile-Reinforced Concrete, ACI SP-250,2008:59-68; 2) A.Br ü ckner, R.Ortlepp, M.Curbach, Textile reinforced concretefor strengthening in bending and shear, Materials and Structures (2006) 39:741-748.The features and applications that the fiber knitted net that above-mentioned article is described strengthens concrete (TRC) is: 1) compare with reinforced concrete structure; The TRC crack is fine and closely woven; Wall approaches light weight, can replace steel concrete to be used as building structural element, like decoration elements such as ceiling, inside and outside wall boards; Also can be used as the part of bearing structure, constitute labyrinths such as Large Span Structure of Arch, shell and prismatic framework through making up many simple prefabricated lightweight TRC members; 2) with TRC to building reinforced concrete structure and wooden construction repairing and reinforcing, can overcome steel wire (muscle) and reinforce not corrosion resistant shortcoming, the TRC that builds thickness and be 10-15mm promptly can improve supporting capacity, improves crack form.
In order to make TRC, this research center has proposed the notion of fine concrete in early days, and this is the very thin concrete of a kind of aggregate, and maximum aggregate size is 0.5~4mm.Adopt the former of fine concrete because: 1) to several centimetres, fine concrete can pass through grid to the size of mesh opening of fiber knitted net smoothly, even can enter into the inside of fiber knitted net from several millimeters; 2) the TRC thickness of structure is generally 10~30mm, and the aggregate size of fine concrete is far smaller than the thin and thick of structure, can satisfy the mechanical property requirements of thin-wall member.The composition of general fine concrete is cement, silica sand and water; In order to satisfy the durability of service behaviour such as high fluidity, glutinous gathering property and water retention and member; Can add I level flyash and silicon ash isoreactivity material in right amount, can also reduce cement consumption like this, reduce cost.Paper Material andbonding characteristic for dimensioning and modeling of textile reinforcedconcrete elements ( Banholzer that delivers in this research center; Tanja Brockmann; Wolfgang Brameshuber.Materials and structures; 2006; The prescription of a kind of fine concrete that typically is used to test that has provided 39:749-763) that this research center adopts; Its batching also comprises super plasticizer except the top composition of mentioning.
Application number is that 200510046304.2 patent application also discloses a kind of fiber knitted net and strengthens concrete (TRC), and the proportioning of its fine concrete is: 52.5R portland cement 472kg/m 3, superfined flyash 168kg/m 3, silicon ash 35kg/m 3, the ultra agent 3.25kg/m that moulds of Sika three generations 3, the silica sand 460kg/m of particle diameter 0~0.6mm 3, the silica sand 920kg/m of particle diameter 0.6~1.2mm 3, water 262kg/m 3, this prescription can satisfy the performance requirement of making TRC.
Application number is that 200510047049.3 patent application discloses a kind of fiber knitted net and concrete adhesive technology; Fiber knitted net is earlier with epoxy resin impregnated; Fine sand is evenly sprayed on the surface then, treats to imbed concrete again behind the curable epoxide, to strengthen and concrete bonding.
Above-mentioned prior art has been studied the TRC material and to the repairing and reinforcing effect of building structure; But adopt fine concrete owing to make TRC, the maximum particle diameter of its aggregate is less than 4mm, and fiber and the fine concrete characteristic of enbrittling; Make TRC when structure reaches capacity load, not have tangible omen; Unlike reinforced concrete structure tangible plasticity developing stage is arranged, tangible sign is arranged during destruction, so from security consideration; The member that the simple TRC of employing makes can not be used for main supporting member, like the bearing part of concrete in mass buildings such as the supporting body of large-scale bridge, storied building structure, ocean platform, harbor work, maritime works.And adopt TRC that existing structure is repaired and reinforced, can not fundamentally change the form of structure, and increase construction weight to a certain extent.
Summary of the invention
The object of the present invention is to provide a kind of concrete building structure of fiber knitted net reinforcing steel bar and preparation method thereof that utilizes; The advantage of this mesh grid enhancing of structure ability binding fiber concrete (TRC) and steel concrete; On the basis that does not increase dead load, limit and improve structural cracks, strengthen structural strength; Make structure safe in utilization, good endurance.
The objective of the invention is to realize through following technical scheme.
A kind of building structure of textile reinforced composite reinforced bar concrete; The thickness of concrete cover of the configuration of its reinforcing bar, the muscle of being advocated, concrete strength grade are according to the design of the design specifications of reinforced concrete structure; It is characterized in that, in the outside that structure receives stretched zone, or the external surface of large-scale integral structure; Be cast with fiber knitted net and fine concrete that gross thickness is 10mm~20mm; Substitute the concrete of external surface equal thickness, the gross thickness of structure is constant, equals intrinsic concrete and always pours into a mould thickness; When fiber knitted net is one deck; Be laid in the middle of the fine concrete; When fiber knitted net was two layers or more, the distance between the fiber knitted net was more than or equal to 2mm, and was evenly arranged in the fine concrete; The distance of the interface of concrete and fine concrete and innermost layer fiber knitted net is 2~5mm, and the thickness that covers the fine concrete on outermost fibers mesh grid surface is 3~5mm; The maximum aggregate size of fine concrete is 0.5~4mm, and strength grade is more than or equal to concrete strength grade.
A kind of fiber below fiber knitted net preferably adopts, or radially use following two kinds of different fibrages respectively: carbon fiber, aramid fiber, alkali-resistant glass fibre, basalt fibre with broadwise.
According to the design specifications of reinforced concrete structure, the configuration of reinforcing bar comprises stressed main muscle minimum steel ratio, the tendon exhaustion limit of being advocated reinforcement ratio, and the preparation of stirrup.The muscle reinforcement ratio range of choice of being advocated of general steel concrete is: greater than minimum steel ratio, less than limit reinforcement ratio.The muscle reinforcement ratio of being advocated of structure of the present invention can be with reinforced concrete structure identical; Receive curved building structure for beam type or board-like etc.; Also can utilize fiber knitted net to bear a part of load, the muscle reinforcement ratio of being advocated can be less than the reinforcement ratio of reinforced concrete structure under the same stress condition, and its scope is: more than or equal to minimum steel ratio; Less than limit reinforcement ratio, the muscle of being advocated adopts hot-rolled reinforced bar or the heat tempering bar with sharp yield point.
The composition of fine concrete is generally cement, silica sand and water; Can also add I level flyash, silicon ash in right amount; Wherein the volume of I level flyash is 20%~40% of cementitious material quality sums such as cement, I level flyash, silicon ash, and the optimum mix amount is 25%~30%; The volume of silicon ash is 5~10% of cementitious material quality sums such as cement, I level flyash, silicon ash, and the optimum mix amount is 6%~8%.
The preparation method of structure of the present invention is the design specifications according to reinforced concrete structure, the configuration of design reinforcing bar, the thickness of concrete cover of the muscle of being advocated, concrete strength grade; Cast is during structure, before concrete initial set, fine concrete and fiber knitted net is cast in the outside that receives stretched zone of structure, or the external surface of large-scale integral structure, and solidifying rear interface can bond well, forms an integral body; Pouring layer with fine concrete and fiber knitted net substitutes the equal thickness concrete; The strength grade of fine concrete is more than or equal to concrete strength grade; Make the intensity of structure of the present invention satisfy design demand; The crack that the fiber knitted net of the structure outside or external surface could limit or improve structure effectively, and, make the intensity of structure be further enhanced because fiber knitted net has stronger tensile strength.
When making beam body or template precast construction, the reinforcing bar body is put into template, wherein stressed main reinforcement is positioned at the template middle and upper part; Build the thick fine concrete of 2~5mm at concrete surface before the concreting, initial set, then fiber knitted net is placed on the fine concrete; On template, fix all around, continue to build fine concrete again, when fiber knitted net is one deck; Be cast in the centre of fine concrete, when fiber knitted net was two layers or more, the distance between the fiber knitted net was more than or equal to 2mm; And evenly arrange; The thickness of always building of fine concrete and fiber knitted net is 10mm~20mm, in the outermost fibers mesh grid, covers the thick fine concrete of 3~5mm, and maintenance is to length of service as a nurse.
When site operation beam body or template etc. have the structure of fulcrum; Because of being advocated tendon protective layer, need cast fine concrete and laying fiber knitted net in template earlier, in order to reduce the extrusion of fiber knitted net in the structure bottom; Should be still uncured but after having certain intensity at the thick fine concrete of the 2~5mm of the superiors; Put into the reinforcing bar body again, concreting, maintenance is to length of service as a nurse.
When making the column type structure; Earlier by conventional job practices concreting; Concrete have certain intensity and uncured before, build the thick fine concrete of 2~5mm at the external surface of cylinder, then fleece is laid on the fine concrete surface; Pour into a mould the fine concrete of required thickness again, maintenance is to length of service as a nurse.
For large-scale overall structure, like dam, ocean platform etc., before concrete does not solidify, fine concrete and fiber knitted net are cast in external surface, the crack that is mainly used in restriction or improves structure.
The fiber knitted net that adopts carbon fiber, aramid fiber, alkali-resistant glass fibre, basalt fibre to be woven into has higher modulus of elasticity and tensile strength, and endurance quality preferably.Can also adopt other fibers such as vinal, polyethylene fibre.Fiber knitted net plays the effect in restriction and dispersed structure crack in structure; Size of mesh opening is more little, the number of plies is many more; Can disperse more and the crack of limiting structure, so in the practice of construction, can be according to the crack requirement for restriction of conventional design; And the specification of fiber knitted net, confirm the number of plies of fiber knitted net.Because the pouring layer of fine concrete and fiber knitted net is in the topping position of the muscle of being advocated; Replace the equal thickness concrete; So total cast thickness of fine concrete and fiber knitted net can not be limited in 10mm~20mm greater than the protective layer thickness of the intrinsic muscle of being advocated.Pass through the requirement that fine concrete transmits power between the fiber knitted net for satisfying, the distance between the fiber knitted net should be more than or equal to 2mm.
Receive curved building structure for beam type or board-like etc.; When being advocated the muscle reinforcement ratio less than the time according to the reinforcement ratio of the design specifications of reinforced concrete structure design; The computational methods of the muscle reinforcement ratio of being advocated and fiber knitted net consumption are: putative structure receives full design load; The concrete compressive strain that reaches capacity, the muscle of being advocated reaches the design yield point, the fiber knitted net stretching strain that reaches capacity; According to structure design carry, parameters such as the tensile strength of the muscle of being advocated on the cross section, sectional area sum; And the performance parameters such as tensile strength of fiber knitted net, calculate the sectional area sum that satisfies the required fiber knitted net of structural bearing requirement by equilibrium equation, thereby draw the size of mesh opening and the number of plies of fiber knitted net.When design; It should be noted that the fiber knitted net number of plies is limited, and the muscle reinforcement ratio of being advocated should satisfy minimum steel ratio, be limited so fiber knitted net substitutes the amount of the muscle of being advocated; But always pour into a mould under the condition of thickness permission at fine concrete and fiber knitted net; Suitably increase the fiber knitted net number of plies, make fiber knitted net laying amount, then can further strengthen carrying (bending resistance) performance of structure greater than above-mentioned design flow.
Because the fragility characteristic of fiber itself does not have tangible omen when structure reaches capacity load, from security standpoint, the muscle of being advocated preferably adopts hot-rolled reinforced bar or the heat tempering bar with sharp yield point.
Before fiber knitted net is imbedded fine concrete; If elder generation smears with epoxy resin or floods; Then fine sand is evenly sprayed on the surface, treat to imbed again behind the curable epoxide, not only can make fiber knitted net and fine concrete that better interface bonding is arranged; And can make the fiber bundle cooperative bearing, have higher tensile strength.Being used for epoxy resin, the curing compound of impregnated fiber woven net, the mass ratio of thinner is 65~70: 60~80: 30~35.
The aggregate size of fine concrete should be less than the size of mesh opening of fiber knitted net.In preparation during fine concrete, should be according to strength grade and service behaviour requirement, confirm cement label, add ratio and the specification and the addition content of silica sand of the quality of water.In order to satisfy the durability of service behaviour such as high fluidity, glutinous gathering property and water retention and member; An amount of I level flyash that adds is grey with silicon, and the volume of I level flyash is greater than 40% o'clock of cementitious material quality sum, the early strength slower development; Be unfavorable for the cast in situs fine concrete; And fiber knitted net stretch-draw fixing after imbedding, I level doping quantity of fly ash should be better in 20%~40%, 25%~30% o'clock effect of cementitious material quality sum.For reducing fine concrete early-age shrinkage and drying shrinkage; Generally the volume of silicon ash be controlled at cementitious material quality sum 10% in; For reducing the early strength slower development that adding coal ash causes, the volume of silicon ash is greater than or equals 5%, and its volume is better in 6%~8% effect.In order to satisfy the different cast requirement of structure; Under the certain situation of intensity, can also add an amount of water reducing agent and regulate service behaviour
In fine concrete, add an amount of short fiber, can improve the toughness of fine concrete, the crack of improving fine concrete.
Structure of the present invention is compared with the reinforcing bar Reinforced Concrete Structure, can effectively control the crack, solves the problem of concrete cracking, reinforcement corrosion; Compare with the reinforced concrete structure that is strengthened concrete (TRC) reinforcing by fiber knitted net; The fine concrete of structure of the present invention and concrete integral body for pouring into before not solidifying; Its interface bonding firmly substitutes concrete with the fine concrete pouring layer, has reduced dead load.Utilize the high-tensile of fiber, can also substitute the part action of steel bars, reduce amount of reinforcement.Structure of the present invention has that deadweight is light, low, anticorrosive, the safe in utilization advantage such as durable of cost.
Description of drawings
Fig. 1 is a kind of schematic cross-section of beam build textile reinforced composite reinforced bar concrete structure.
Fig. 2 is the spaning middle section moment of flexure and the mid-span deflection curve of a kind of beam build textile reinforced composite reinforced bar concrete structure and contrast test specimen thereof.
1 is fine concrete among Fig. 1, and 2 is fiber knitted net, and 3 are the muscle of being advocated, and 4 is stirrup, and 5 is template, and 6 is concrete, and 7 is the interface of concrete and fine concrete, and a is the tendon protective layer thickness of being advocated, h 0Be effective depth of section, the adhesion of tendon and muscle after injury point of force application of promptly being advocated is to the distance of pressure zone concrete surface, h fBe the distance of fiber knitted net point of resultant force to the pressure zone concrete surface, b is a breadth of section, and h is a depth of section.
Curve I is the spaning middle section moment of flexure and the mid-span deflection curve of textile reinforced composite reinforced bar concrete structure among Fig. 2; Curve II is the curve of the contrast test specimen that does not add fiber knitted net of same size, concrete strength, reinforcing bar configuration and load mode; Longitudinal axis is the spaning middle section moment M; Lateral shaft is mid-span deflection f, and A, C are the yield point of muscle of being advocated, and B, D are the bearing capacity limit point of structure.
The specific embodiment
Below in conjunction with embodiment the present invention is described further, embodiment does not limit the scope of the invention.
Make a single span freely-supported rectangular beam with this bright method, the cross section is as shown in Figure 1, and effective span is 1800mm, and sectional dimension is wide b=120mm, high h=210mm; Environment category is one type, cross section moment of flexure design load M=15kNm
According to the design specifications design of reinforced concrete structure, this structural concrete strength grade is C40, resistance to compression design strength f c=19.1N/mm 2, the structure minimum steel ratio is 0.26%, and limit reinforcement ratio is 3.50%, and the protective layer thickness of the muscle of being advocated is a=25mm.3 diameters of muscle employing are 12mm, tension design strength f if advocated yBe 300N/mm 2The HRB335 grade reinforcing steel, the structural reinforcement rate is 1.578%, moment M can reach 15.94kNm, satisfies cross section moment of flexure designing requirement.
The HRB335 level that it is 12mm that this structure only the adopts 2 diameters muscle of being advocated, its reinforcement ratio is merely 1.05%, substitutes the reinforcing bar that reduces with fiber knitted net.
The fiber knitted net that this structure adopts is carbon fiber T700 along the radial force fiber of span direction, and dimension is a glass fiber to anchoring fiber, and the tensile strength of carbon fiber is f f=4660Mpa, ultimate tensile strength ε Fu=0.020, elastic modulus E f=231GPa.As tieing up, can reduce cost with glass fiber to anchoring fiber.
At first calculate the quantity of needed fiber knitted net:
Suppose the compressive strain that reaches capacity of pressure zone concrete, the reinforcing bar of tensile region is surrendered, and the total sectional area of fiber knitted net is calculated in the stretching strain of the fiber knitted net stretching strain that reaches capacity by the equilibrium equation of following cross section power and moment of flexure
α 1f cβ 1x cb=f yA sfE fA f (1)
M=α 1f cβ 1x cb(h/2-β 1x c/2)+f yA s(h 0-h/2)+ε fE fA f(h f-h/2) (2)
In the following formula, the equivalent rectangular stress block alpha 1=1.0, β 1=0.8, concrete resistance to compression design strength f c=19.1N/mm 2, breadth of section b=120mm, reinforcing bar tension design strength f y=300N/mm 2, tensile reinforcement total sectional area A s=226mm 2ε fBe the stretching strain of fiber knitted net, when the stretching strain of fiber knitted net reaches capacity stretching strain, ε fFu=0.020, the elastic modulus E of Carbon Fibre Textile f=231Gpa; Structural section design moment M=15kNm, depth of section h=210mm, the distance h of adhesion of tendon and muscle after injury point of force application of being advocated to the pressure zone concrete surface 0=210-25-(12/2)=179 (mm), h fBe the distance of fiber knitted net point of resultant force to the pressure zone concrete surface, the protective layer thickness of establishing fiber knitted net is 5mm, because distance enough little (2mm) between net, and fiber bundle diameters is very little, ignores these influences, then h f=210-5=205 (mm).
With known parameter substitution equilibrium equation, try to achieve the total sectional area A of fiber knitted net f=6.39mm 2As long as the total sectional area of fiber knitted net is equal to or greater than 6.39mm 2, the load-carrying properties of structure just can satisfy the designing requirement of Cross section Design moment M=15kNm.
The size of mesh opening of this structural fibers mesh grid is selected 10mm * 10mm for use, and single bundle fiber area is 0.44mm 2, the individual layer net has 10 bundle fibers in the breadth of section of 120mm.When disposing 2 layers of fiber knitted net, the actual laying of the carbon fiber of the radial force gross area is A f=0.44 * 10 * 2=8.8mm 2, meet design requirement.With this A fIn value generation, gone back to equation (1) and (2), draws the cross section moment of flexure that member can bear and reach M=16.98kNm.
This structure fabrication step is following:
1) fine concrete is made up of less than silica sand, the water of 2mm PII52.5R portland cement, I level flyash, silicon ash, particle diameter, and its proportioning is for being PII52.5R portland cement 490kg/m 3, I level flyash 175kg/m 3, silicon ash 35kg/m 3, water 280kg/m 3, maximum particle diameter is the silica sand 1280kg/m of 1.2mm 3, the volume of I level flyash is 25% of cementitious material quality sums such as cement, flyash, silicon ash, the volume of silicon ash is 5% of cementitious material quality sums such as cement, flyash, silicon ash.28 days cubic compressive strengths of this fine concrete are 56Mpa, greater than concrete 28 days cubic compressive strengths (45Mpa) of C40.
2) as shown in Figure 1, the reinforcing bar body is put in the template 5, the muscle 3 of wherein being advocated is the HRB335 grade reinforcing steel that 2 diameters are 12mm; Its top edge is apart from the template upper edge, promptly the advocated thickness of concrete cover a of muscle is 25mm; Stirrup 4 is the HPB235 reinforcing bar, and diameter is 6.5mm, and spacing is 100mm.
3) build the concrete 6 that label is C40, the shake puddling is real, its surface distance template upper edge 10mm.
4) epoxy resin, curing compound and thinner are stirred by 1: 1: 0.5 mass ratio mixing; After treating that it fully mixes, evenly brushing guarantees that on the surface of fiber knitted net epoxy resin is immersed in the fiber roving; Again fine sand evenly is sprinkling upon fiber woven net surface, sclerosis.
5) before the concrete initial set; Cast 3mm thick fine concrete 1 on its surface 7 is put into first floor fiber knitted net 2 the fine concrete surface and is fixed on the template 5, second layer fiber knitted net 2 is fixed on the template 5 again; Interlayer is divided into 2mm; Build fine concrete, second layer fiber knitted net external surface has been built the thick fine concrete of 5mm, and it is 10mm that fine concrete and fiber knitted net are always built thickness.
6) in outdoor natural curing form removal in 24 hours, maintenance to 28 day length of time then.In the maintenance processes, body structure surface covers with sponge and waters, and temperature is between the 20-25 degree.
The contrast experiment:
The contrast test specimen is identical with load mode with specification, concrete strength, the reinforcing bar configuration of present embodiment structure, does not add fiber knitted net and fine concrete.
Adopt four-point bending test, the distance (being the simple bending section) between two load(ing) points be 600mm, and testing machine adopts 1000KN system controlled by computer hydraulic servo testing machine, and hierarchical loading is controlled.The simple bending section is arranged foil gauge measurement cracking load in the structure bottom surface, writes down load with load sensor, and mid-span deflection is measured with two LVDT, and collecting device is the IMC (Integrated Measurement&Control) of German import.Result of the test is seen accompanying drawing 2.
Curve I is the spaning middle section moment of flexure and the mid-span deflection curve of present embodiment structure, and when the carrying of structure reaches when being advocated muscle yield point A, the spaning middle section moment of flexure is 17.87kNm, and mid-span deflection is 6.1mm; When the carrying of structure reached capacity carrying force B, the spaning middle section moment of flexure was 22.40kNm, and mid-span deflection is 27.5mm.
Curve II is the spaning middle section moment of flexure and the mid-span deflection curve of contrast test specimen, and when the carrying of structure reaches when being advocated muscle yield point C, the spaning middle section moment of flexure is 14.7kNm, and mid-span deflection is 6.2mm; When the carrying of structure reached capacity carrying force D, the spaning middle section moment of flexure was 18.39kNm, and mid-span deflection is 38.8mm.
Comparison curves I and II; Can find out that curve I is advocated the ultimate bending moment of yield moment, structural element of muscle greater than curve II; Explain that laying fiber knitted net can significantly improve the yield load of the muscle of being advocated and the ultimate bearing capacity of structural element, explain that structure of the present invention has higher supporting capacity than the reinforced concrete structure of same specification and reinforcing bar configuration.
Also measure in test, the present embodiment structure in the crack width scope that design allows, crack, cracking back slower development, and distance is less between the crack; And behind the contrast test specimen cracking, major fracture can develop always.When being advocated the muscle surrender, the maximum crack width of contrast test specimen is 1.4mm, and the maximum crack width of structure of the present invention only has 0.16mm, has proved restriction and the improvement of structure of the present invention to structural cracks.

Claims (6)

1. the building structure of a textile reinforced composite reinforced bar concrete; The thickness of concrete cover of the configuration of its reinforcing bar, the muscle of being advocated, concrete strength grade are according to the design of the design specifications of reinforced concrete structure; It is characterized in that, in the outside that structure receives stretched zone, or the external surface of large-scale integral structure; Be provided with before concrete initial set cast, always pour into a mould fiber knitted net and the fine concrete that thickness is 10mm~20mm, substitute the concrete of equal thickness; When fiber knitted net is one deck; Be laid in the middle of the fine concrete; When fiber knitted net is more than two layers the time, the distance between the fiber knitted net is more than or equal to 2mm, and is evenly arranged in the fine concrete; The distance of the interface of concrete and fine concrete and innermost layer fiber knitted net is 2~5mm, and the thickness that covers the fine concrete on outermost fibers mesh grid surface is 3~5mm; The maximum aggregate size of fine concrete is 0.5~4mm; Strength grade is more than or equal to concrete strength grade; The composition of fine concrete comprises cement, I level flyash, silicon ash, silica sand and water; Wherein the volume of I level flyash is 20%~40% of cement, I level flyash, a silicon ash quality sum, and the volume of silicon ash is 5~10% of cement, I level flyash, a silicon ash quality sum.
2. the building structure of textile reinforced composite reinforced bar concrete according to claim 1; It is characterized in that; Fiber knitted net is by following a kind of fibrage, perhaps radially with broadwise respectively by following two kinds of different fibrages: carbon fiber, aramid fiber, alkali-resistant glass fibre, basalt fibre.
3. the preparation method of the building structure of a kind of textile reinforced composite reinforced bar concrete as claimed in claim 1 is characterized in that, before concrete initial set; Fine concrete and fiber knitted net are cast in the outside that receives stretched zone of structure, or the external surface of large-scale integral structure, when fiber knitted net is one deck; Be cast in the middle of the fine concrete; When fiber knitted net is more than two layers the time, the distance between the fiber knitted net is more than or equal to 2mm, and is evenly arranged in the fine concrete; Pour into a mould the thick fine concrete of 2~5mm between innermost layer fiber knitted net and the concrete, the thickness of outermost fibers mesh grid surface casting fine concrete is 3~5mm; The thickness of always building of fine concrete and fiber knitted net is 10mm~20mm, substitutes the equal thickness concrete; The maximum aggregate size of fine concrete is 0.5~4mm; Strength grade is more than or equal to concrete strength grade; The composition of fine concrete comprises cement, I level flyash, silicon ash, silica sand and water; Wherein the volume of I level flyash is 20%~40% of cement, I level flyash, a silicon ash quality sum, and the volume of silicon ash is 5~10% of cement, I level flyash, a silicon ash quality sum.
4. the preparation method of the building structure of textile reinforced composite reinforced bar concrete according to claim 3; It is characterized in that; A kind of fiber below fiber knitted net adopts is perhaps radially used following two kinds of different fibrages respectively with broadwise: carbon fiber, aramid fiber, alkali-resistant glass fibre, basalt fibre.
5. the preparation method of the building structure of textile reinforced composite reinforced bar concrete according to claim 4; It is characterized in that; When building structure is beam type or plank frame; The muscle of being advocated adopts hot-rolled reinforced bar or heat tempering bar, and the reinforcement ratio of the muscle of being advocated is more than or equal to minimum steel ratio, less than limit reinforcement ratio; Calculate the sectional area sum that satisfies the required fiber knitted net of structural bearing requirement by equilibrium equation, computing parameter comprises that structure design is carried, the tensile strength of the tensile strength of the muscle of being advocated and sectional area sum, fiber knitted net.
6. according to the preparation method of the building structure of claim 3 or 4 or 5 described a kind of textile reinforced composite reinforced bar concrete intensity; It is characterized in that; Before fiber knitted net is imbedded fine concrete; Flood earlier or smear epoxy resin, evenly spray silica sand then, flood or smear epoxy resin, the curing compound of fiber knitted net, the mass ratio of thinner is 65~70: 60~80: 30~35.
CN2009100102589A 2009-01-22 2009-01-22 Construction structure for textile reinforced composite reinforced bar concrete and manufacturing method thereof CN101481930B (en)

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CN101481930B true CN101481930B (en) 2012-02-29

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CN103132651A (en) * 2013-01-15 2013-06-05 盐城工学院 Textile reinforced concrete (TRC) tube restraining reinforced concrete column
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US20170165941A1 (en) * 2015-12-10 2017-06-15 Nano And Advanced Materials Institute Limited Multi-layer fabric reinforced cementitious matrix and application method thereof
CN106401623A (en) * 2016-11-09 2017-02-15 安徽理工大学 Full-closed coal mining device for soil-like coal working face and coal mining method of full-closed coal mining device
CN108457418B (en) * 2018-04-28 2021-04-06 刘祥锦 Bamboo batten-containing structural slab and design method thereof
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