CN108894432A - A kind of very-high performance steel fiber concrete pipe constraint regeneration monolith column - Google Patents

A kind of very-high performance steel fiber concrete pipe constraint regeneration monolith column Download PDF

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CN108894432A
CN108894432A CN201810798609.6A CN201810798609A CN108894432A CN 108894432 A CN108894432 A CN 108894432A CN 201810798609 A CN201810798609 A CN 201810798609A CN 108894432 A CN108894432 A CN 108894432A
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concrete
uhpfrc
pipe
high performance
steel fiber
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CN108894432B (en
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杨贞军
姚勇
吴建营
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Zhejiang University ZJU
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Zhejiang University ZJU
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C3/00—Structural elongated elements designed for load-supporting
    • E04C3/30—Columns; Pillars; Struts
    • E04C3/34—Columns; Pillars; Struts of concrete other stone-like material, with or without permanent form elements, with or without internal or external reinforcement, e.g. metal coverings
    • 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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/38—Fibrous materials; Whiskers
    • C04B14/48—Metal
    • 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
    • C04B28/02—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 containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ceramic Engineering (AREA)
  • Architecture (AREA)
  • Structural Engineering (AREA)
  • Civil Engineering (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Rod-Shaped Construction Members (AREA)

Abstract

The invention discloses a kind of very-high performance steel fiber concrete pipes to constrain regeneration monolith column.It uses very-high performance fiber concrete (UHPFRC) pipe to constrain the mix concrete made of regeneration concrete block and fresh concrete.Lining is placed in UHPFRC pipe, UHPFRC pipe is caused to damage when preventing from pouring.In fresh concrete, configuration reinforcement can according to need.According to different Structural Design Requirements, UHPFRC pipe only can play hoop constraint, can also bear vertical load simultaneously, compound column end is using corresponding different constraints.Compared with conventional steel concrete, the interface mechanical characteristic of UHPFRC and fresh concrete is more preferable, and structural integrity is good, which has better durability and fire resistance, can resist the disasters such as earthquake, impact, explosion well.In addition, using regeneration concrete block portion point substitution fresh concrete, high financial profit has sustainable development value.The combined column is easy for construction, and process is simple, low cost.

Description

A kind of very-high performance steel fiber concrete pipe constraint regeneration monolith column
Technical field
The present invention relates to construction material and structural engineering fields, and in particular to a kind of very-high performance steel fiber concrete pipe is about Shu Zaisheng monolith column.
Background technique
Concrete becomes most popular manufactured construction materials because of its lower cost and good mechanical property. The annual concrete usage amount in the whole world has been more than 10,000,000,000 tons at present, it is contemplated that will increase to 18,000,000,000 tons to the year two thousand fifty, wherein China disappears 50% or more of global all concrete yield is consumed.But concrete industry has serious influence to environment, it is annual to discharge Carbon dioxide more than 1,600,000,000 tons accounts for the 7% of annual global human activity CO2 emissions.Most of concrete products are It is made of the armored concrete of regular tenacity, due to material degradation and steel bar corrosion, so that the architectural design service life is only 50 years.Cause This, building trade still needs new construction material and structural system, thus to safer, it is more green, it is more durable and sustainable Direction develop.This is especially urgent for the sustainable development of China, because low-quality construction material and technology, cause The service life of most of buildings only has 30 years or so.
Steel core concrete column has been widely used, particularly in China, in the large spans knot such as skyscraper, bridge and factory In structure, since steel pipe is to the effect of contraction of concrete, so that steel core concrete column is than traditional reinforced column with higher Bearing capacity, ductility and durability.However, there are some problems for concrete filled steel tubular member：(1) concrete and steel have Different modulus and thermal expansion coefficient leads to the Incoordinate deformation of the two, and often destroys in interface, this is to structural intergrity It is harmful.Moreover, these defect hidings in pipe, are difficult to measure and monitor；(2) high-intensity performance of steel usually not by It makes full use of；(3) steel pipe is easy to be corroded and corrode, especially under severe conditions environment (such as chemical plant, offshore platform, Nuclear power station), fire resistance is not so good as concrete.Additional safeguard measure will increase cost and structural complexity.
In concrete filled steel tube, it can be substituted with old concrete block (having a size of the 50-300mm) part removed and newly mix coagulation Soil.Recycled aggregate (5-40mm) is produced to substitute the natural aggregate in novel concrete, needs to be crushed, sieves and wash.And it produces Regeneration concrete block only needs coarse crushing, it reduce the energy consumption of 40-60%, and the substitution rate of regeneration concrete block (RR) be 33% when, about 30% cement consumption can be saved, the ultimate load and effective rigidity of concrete filled steel tube but decline respectively 5-15% and 7-14%, and ductility and initial stiffness variation are little.During these new concrete filled steel tubes have been successfully applied for In the actual items of state, and obtains a small amount of patent and issued design guidelines.Although this new concrete recovery technology has Huge sustainability benefit, but the shortcomings that above-mentioned three kinds of concrete filled steel tubes, still has.
Summary of the invention
In order to overcome the above problem, the present invention provides a kind of combined columns of brand new class, using very-high performance steel fibre Concrete (UHPFRC) pipe substitutes steel pipe, to constrain mixes coagulation made of regeneration concrete block and fresh concrete Soil.The combined column has excellent intensity, ductility, durability and sustainability.
Very-high performance steel fiber reinforced concrete UHPFRC is a kind of relatively new fiber reinforced cement-based material, will be high-strength Degree steel/polymer fiber is randomly distributed in fine and close high-strength mortar, has excellent permeability resistance, aggressivity, corrosion resistance And fire resistance.The Typical strengths of UHPFRC are compressed more than 150MPa.Due to the bridge linking effect of fiber, stretches and bending strength can 12MPa and 40MPa are respectively reached, fracture toughness reaches 40kJ/m2, make it have the toughness as metal.In addition, its is close The concrete of degree, modulus and thermal expansion coefficient very close to regular tenacity.This will greatly improve UHPFRC pipe and confined concrete Between compatibility of deformation.Compared with conventional steel concrete, this mix concrete filling UHPFRC tubing string has higher Durability and fire resistance, while the high intensity of UHPFRC, toughness and ductility are taken full advantage of, earthquake can be resisted well, The disasters such as impact and explosion, and fresh concrete is replaced with regeneration concrete block portion point, the meaning with sustainable development.
Specific technical solution of the present invention is as follows：
A kind of very-high performance steel fiber concrete pipe constraint regeneration monolith column comprising UHPFRC pipe, regeneration are mixed Solidifying soil block and fresh concrete；External hoop constraint of the UHPFRC pipe as concrete column, regeneration concrete block and is newly mixed Concrete after evenly mixing, is poured and is filled in UHPFRC pipe in proportion, and UHPFRC pipe is as permanent template and internal coagulation Soil links into an integrated entity.
Preferably, being formulated with reinforcing bar in concrete in the UHPFRC pipe.
Preferably, the mass ratio of regeneration concrete block is no more than 40% in mix concrete in the UHPFRC pipe, Preferably 25%~35%；Preferably, the block surface of regeneration concrete block is answered pollution-free and is cleaned up, and characteristic size is little In the 1/3 of the concrete column cross section short side direction size.When cross section is polygon, cross section short side refers to cross section most Short side；When cross section is round, cross section short side can be equivalent to diameter.
Preferably, manufacturing the concrete material of the UHPFRC pipe by cement, mineral admixture, fine sand, water, quartz Powder, water-reducing agent, steel fibre composition, each component content are calculated according to the mass fraction, its ratio be：1000-1300 parts of cement, mineral are mixed With material 100-650 parts, 900-1200 parts of fine sand, 100-300 parts of silica flour, 30-60 parts of water-reducing agent, 150-400 parts of water, steel fibre 50-300 parts；The mineral admixture is that silicon ash or silicon ash and the mixture of flyash, blast-furnace cinder (mix powder in silicon ash At least one of coal ash or blast-furnace cinder)；There is profiled fibre, profiled fibre includes end hook in the steel fibre One of fiber, undulated fibre or screw steel fiber are a variety of.The compression strength of such UHPFRC is generally more than 150Mpa.
Preferably, the built-in lining for tube body damage when preventing from pouring of the UHPFRC pipe of concrete column, the lining Son uses sheet steel pipe or braided fiber net.
Further, steel fibre, carbon fiber, basalt fibre, vinal are selected as in the braided fiber network optimization Or polyethylene fibre, the sheet steel pipe thickness is preferably 0.8mm-10mm.
Preferably, the UHPFRC tube thickness is 20mm-120mm.
Preferably, the cross-sectional shape of the UHPFRC pipe is rectangular, round or other polygons.
Preferably, the axial compression ratio of the concrete column is no more than 0.65.
Preferably, UHPFRC tube end uses different the way of restraint, UHPFRC according to different Structural Design Requirements Pipe only can play hoop constraint, can also bear vertical load simultaneously.Specifically connection type includes：When UHPFRC is managed not When load-bearing, UHPFRC tube end uses flexible connection mode, and UHPFRC pipe reserves 10-80mm construction joint with two leaf of column, After the completion of construction, using pitch or the perfusion sealing of high elastic rubber material；When UHPFRC pipe load-bearing, using rigid connection side Formula, UHPFRC pipe are poured by high-strength friction-type bolt and Node connectedness, or in node stitching portion using the integration of UHPC mortar Build up type.
Above-mentioned very-high performance steel fiber concrete pipe constraint regeneration monolith column, according to GB50010-2010《Coagulation Soil structure design specification》, normal section Compressive Bearing Capacity is
Wherein, N is axial compressive force design value；For the coefficient of stability of reinforced concrete member；fc1For normal concrete axis Heart compression strength design value；fc2For UHPFRC axial compressive strength design value；A1For normal concrete area of section；A2For UHPFRC tube section area；fy' it is longitudinal regular reinforcement compressive yield strength design value；As' cutting for all longitudinal regular reinforcements Face area.
Above-mentioned very-high performance steel fiber concrete pipe, which constrains, regenerates monolith column, under the conditions of same cross-sectional area, Normal section bearing capacity is significantly improved relative to common concrete column.Tables 1 and 2 lists circular columns and square column respectively, not When arrangement of reinforcement, the normal section of very-high performance steel fiber concrete pipe constraint regeneration monolith column and common concrete column is carried Power.Wherein, normal concrete cubic block compressive strength standard value takes 30Mpa, and UHPFRC cubic block compressive strength standard value takes 3m is taken with the computational length of 170Mpa, column.
Foundation《Code for design of concrete structures》GB 50010-2010, normal concrete axial compressive strength designs herein Value is fc1=14.3MPa；UHPFRC compressive strength standard value presses fck=0.88 αc1αc2fcu,kIt is reduced, fck2= 106.7MPa, UHPFRC design specification NF P 18-710, f according to France, Dec=αccfck/γc, for UHPFRC material, γcTake 1.3, αcc0.85 is taken, then its axial compressive strength design value is fc2=69.8MPa.
In table, d is round concrete section diameter；
A is square concrete section side length；
T is UHPFRC tube thickness；
For the coefficient of stability of reinforced concrete member；
A is column total cross-sectional area, A=A1+A2, wherein for circular columnsA2=π (dt+t2), for rectangular Column A1=a2, A2=4 (at+t2)；
N1For very-high performance steel fiber concrete pipe constrain regeneration monolith column normal section can bearing load value,
N2For common concrete column normal section can bearing load value,
η is N1With N2Ratio, η=N1/N2。
1 circular columns normal section of table can bearing load
2 square column normal section of table can bearing load
Above table calculating parameter shows that when with same cross-sectional area, very-high performance steel fiber concrete pipe constrains Regenerating monolith column has biggish bearing capacity advantage compared to common concrete column, and UHPFRC thickness is bigger, compound Normal concrete portion size is got over hour in column, and advantage is more obvious.When using identical design load, very-high performance steel is fine Pipe of concrete constraint regeneration monolith column is tieed up compared to common concrete column, smaller cross-sectional dimension can be used.
The invention discloses a kind of very-high performance steel fiber concrete pipes to constrain regeneration monolith column, using superelevation Can steel fiber reinforced concrete (UHPFRC) pipe substitute steel pipe, mixed made of regeneration concrete block and fresh concrete to constrain It closes concrete (MCC).Compared with conventional steel concrete, the interface mechanical characteristic of UHPFRC and fresh concrete is more preferable, structure Globality is good, which has better durability and fire resistance, can resist the disasters such as earthquake, impact, explosion well.This Outside, using regeneration concrete block portion point substitution fresh concrete, high financial profit has sustainable development value.The combined column Easy for construction, process is simple, low cost.
Detailed description of the invention
Fig. 1 is circular cross-section no-reinforcing-bar cage combined column simplified schematic diagram, wherein a is horizontal sectional drawing, and b is facade section；
Fig. 2 is square-section arrangement of reinforcement combined column simplified schematic diagram, wherein a is horizontal sectional drawing, and b is facade section；
Fig. 3 is circular cross-section no-reinforcing-bar cage combined column sectional axonometric drawing；
Fig. 4 is square-section arrangement of reinforcement combined column sectional axonometric drawing.
Fig. 5 is a kind of rectangular section screw steel fiber structure schematic diagram employed in the present invention；It wherein a) is main view Figure, b) it is axonometric drawing；
In Fig. 6, (a) is single screw steel fiber in C30 mortar, after XCT is scanned, obtained test specimen external morphology； (b) it is test specimen of the single screw steel fiber after being extracted in C30 mortar, is scanned through XCT, is come left by obtained test specimen inside Channel morphology；
Fig. 7 (a) is single screw steel fiber in UHPC mortar, after XCT is scanned, obtained test specimen external morphology；(b) It is test specimen of the single screw steel fiber after being extracted in UHPC mortar, is scanned through XCT, is come left by obtained test specimen inside logical Road form.
Specific embodiment
Combined with specific embodiments below, the present invention is described in further detail, but not limited to this.
In following embodiments, unless otherwise specified, the reagent and material be it is well known, can be obtained by commercial sources It takes.
Embodiment 1
In the present embodiment, very-high performance steel fiber concrete pipe constraint regeneration monolith column is as shown in figs. 1 and 3.It should Concrete column is combined column, is made of UHPFRC pipe, regeneration concrete block and fresh concrete.UHPFRC pipe is as concrete column External hoop constraint, regeneration concrete block and fresh concrete obtain mix concrete after evenly mixing in proportion, are poured It builds and is filled in UHPFRC pipe, UHPFRC pipe links into an integrated entity as permanent template and internal concrete.Form combined column.
In the present embodiment, used specific raw material are as described below：
Regeneration concrete block removes protective layer and the waste and old concrete block after reinforcing bar by dismounting old buildings, by broken It is obtained after broken, cleaning, classification, characteristic size 60mm-120mm.
Fresh concrete is mixed to obtain by portland cement, coarse aggregate, fine aggregate and water, wherein：Cement is silicic acid Salt cement；Coarse aggregate uses partial size for 5mm-15mm cobble；Fine aggregate uses river sand, is the good middle sand of gradation；Water is industry Use water.
The match ratio (mass ratio) for newly mixing normal concrete is as shown in table 3 below.
3 common concrete proportioning of table
The very-high performance steel fiber concrete pipe (UHPFRC pipe) of the present embodiment use round tube, cross-sectional diameter 300mm, High 1200mm, UHPFRC thickness of pipe wall are 30mm, and old concrete block partial size is 60mm-120mm, and the Replacement rate to cylinder is 25%, i.e. mass ratio of the regeneration concrete block in mix concrete is 25%.UHPFRC pipe in the present embodiment, UHPFRC Concrete material component includes cement, silicon ash, fine sand, water, silica flour, high efficiency water reducing agent, steel fibre.During UHPFRC pipe uses, Used steel fibre is straight line steel fibre, and diameter 0.2mm, length 12mm, draw ratio 60, tensile strength is 2700Mpa.Used cement is ordinary portland cement.The specific surface area of silicon ash is 22m2/ g, wherein SiO2Content >=90%, Fine sand particle size range is 0.1mm-0.5mm, and silica flour partial size is 5 μm -50 μm, SiO2Content >=95%.High efficiency water reducing agent is poly- The efficient powder water-reducing agent of carboxylic acid, diminishing efficiency >=30%.Water is industrial water.
Each component mass ratio is as shown in table 4 below in UHPFRC.
4 UHPFRC match ratio of table
The very-high performance steel fiber concrete pipe constraint of the present embodiment regenerates the specific manufacturing process of monolith column and is：In advance The component for first pressing above-mentioned table 4, mixes and stirs UHPFRC, has then poured UHPFRC pipe, conserves 28d in standard conditions.Then will As Side shuttering is poured, bottom faces are sealed UHPFRC pipe with plank sheathing.The hoop with a thickness of 0.8mm is placed inside UHPFRC Stalloy, hoop stalloy are close to UHPFRC pipe medial surface in the form of the sheet steel pipe that outer diameter is slightly less than UHPFRC bore, as Lining causes to damage when preventing from pouring to UHPFRC pipe.Old concrete block is put into UHPFRC, then general by what is newly mixed Logical concrete pours into UHPFRC pipe, and two kinds of concrete are both needed to carry out accurate magnitude, so that old concrete block is in mixing coagulation Mass ratio in soil is 25%.Concrete inject after, sufficiently vibrated using shock club, make old concrete block with newly mix it is general Logical concrete uniformly mixes, and is distributed and fills full column body.Under standard conditions, 28d is conserved, that is, it is strong to can reach structure design Degree.
As shown in the calculating of Tables 1 and 2, when with same cross-sectional area, the very-high performance steel fibre of the present embodiment is mixed Solidifying soil pipe constraint regeneration monolith column has biggish bearing capacity advantage compared to common concrete column.And UHPFRC Pipe has better durability and fire resistance compared to conventional steel concrete.In addition, the use of regeneration concrete block, again So that the concrete column has economic benefit and environmental benefit.
Embodiment 2
For the present embodiment for embodiment 1, difference, which is only that, changes UHPFRC pipe into square tube, and manages in UHPFRC Built-in steel reinforcement cage, other ways are all the same.
Concrete column structure is as shown in Figures 2 and 4.Specifically, the square-section UHPFRC of the present embodiment is managed, cross section Having a size of 300mm × 300mm, high 1200mm, UHPFRC thickness of pipe wall is 30mm, and old concrete block partial size is 60mm-120mm, Replacement rate to cylinder is also 25%.The intracorporal reinforcing bar of column, longitudinal rib select HRB335 grades of reinforcing bars, and diameter 14mm amounts to 12 Root, stirrup use HRB335 grades of reinforcing bars, diameter 10mm, spacing 100mm.UHPFRC pipe and common coagulation in the present embodiment The match ratio difference of soil is as shown in Table 3 and Table 4, and same as Example 1, raw material is also consistent.
The very-high performance steel fiber concrete pipe constraint of the present embodiment regenerates the specific manufacturing process of monolith column and is：In advance The component for first pressing above-mentioned table 4 has poured UHPFRC pipe, conserves 28d in standard conditions.Then using UHPFRC pipe as pouring side Template, bottom faces are sealed with plank sheathing.4 220mm × 580mm × 0.8mm stalloys, stalloy are placed inside UHPFRC It is close to UHPFRC pipe medial surface UHPFRC pipe is caused to damage when preventing from pouring as lining.Then, the steel that will have been bound Muscle cage is placed in UHPFRC tube body.It is put into old concrete block into UHPFRC, then the normal concrete newly mixed is poured into In UHPFRC pipe, two kinds of concrete are both needed to carry out accurate magnitude, so that mass ratio of the old concrete block in mix concrete It is 25%.It after concrete injects, is sufficiently vibrated using shock club, makes old concrete block and new to mix normal concrete uniform Mixing, is distributed and fills full column body.Under standard conditions, 28d is conserved, that is, can reach structure design strength.
The present embodiment, due to placed steel reinforcement cage in inside, further enhances concrete for embodiment 1 Intensity.
Embodiment 3
For embodiment 1 or 2, difference is to the coagulation local soil type of UHPFRC at improving the present embodiment, Devise a kind of screw steel fiber concrete, it is intended to promote the mechanical property of traditional steel fiber reinforced concrete, and further The toughness and deformation performance for improving UHPFRC, enable steel fibre more to give full play to the mechanical characteristic of its bridge linking effect, reinforce The performance of UHPFRC pipe.
1. the preparation of screw steel fiber concrete：
In the present embodiment, the concrete material component of UHPFRC pipe is still cement, silicon ash, fine sand, water, silica flour, height Water-reducing agent, steel fibre are imitated, but steel fibre contains screw steel fiber.Steel fibre can be the mixed of straight line steel fibre and screw steel fiber It closes, can also be entirely screw steel fiber.For screw steel fiber as a kind of odd-shaped cross section steel fibre, structure is as shown in Figure 5.With circle The straight line type steel fibers of tee section are compared, and have stronger mechanical snap power between screw steel fiber and concrete substrate, thus With stronger interfacial bond property.Screw steel fiber is compared with conventional end hook steel fibre, although the two belongs to profile iron fibre Dimension, however, the pull-out curve of screw steel fiber is fuller in ultra-high performance concrete matrix, pulling capacity hardening phenomenon is bright It is aobvious, better deformability and toughness can be provided.
The present embodiment will design the concrete material of 3 groups of different component ratios below, and number 1-1,1-2,1-3 are used for Show the specific preparation of this kind of reinforced UHPFRC.The component of 3 groups of UHPFRC concrete materials be cement, silicon ash, fine sand, Water, silica flour, high efficiency water reducing agent and steel fibre.Raw material parameter is as follows：Straight line steel fibre, diameter 0.2mm, length are 12mm, draw ratio 60, tensile strength 2700Mpa.As shown in figure 5, screw steel fiber section is rectangle and rectangular section is 0.53mm × 0.37mm, equivalent diameter 0.5mm, torsion screw pitch are 10mm, tensile strength 2500Mpa.Institute the cement that uses for Ordinary portland cement.The specific surface area of silicon ash is 22m2/ g, wherein SiO2Content >=90%, fine sand particle size range are 0.1mm- 0.5mm, silica flour partial size are 5 μm -50 μm, SiO2Content >=95%.High efficiency water reducing agent is the efficient powder water-reducing agent of polycarboxylic acids, is subtracted Water efficiency >=30%.Water is industrial water.
Each component quality is as shown in table 5 below in every group of concrete, provides by the number of the mass ratio of each component.
The match ratio of 5 screw steel fiber ultra-high performance concrete material of table
In the present embodiment, the preparation process of screw steel fiber concrete is as follows：
1) cement of mass fraction described in table 5, silicon ash, fine sand, water, silica flour, high efficiency water reducing agent, steel fibre weighing is standby With；
2) stirring will be added by cement, silicon ash, fine sand, silica flour, the high efficiency water reducing agent after the weighing of mass fraction described in table 5 In machine, dry mixing 2min, is uniformly mixed at a slow speed；
3) in the resulting dry batch of 2) step, the water of about the weighed total amount half of addition, moderate-speed mixer about 4min, then plus Enter remaining water, moderate-speed mixer about 5min, the fresh concrete mortar stirred evenly, i.e. ultra-high performance concrete (UHPC), in this, as matrix intensity with higher, enough anchor forces can be provided to fiber, is conducive to play steel fibre Mechanical advantage；
4) into the resulting fresh concrete mortar of step (3), straight line steel fibre is first added, moderate-speed mixer about 2min is mixed It closes uniformly (when there is no straight line steel fibre in component, can skip the step).Screw steel fiber is added, moderate-speed mixer is about 4min, the screw steel fiber ultra-high performance concrete mixture stirred evenly to get arrive concrete finished product.
In above-mentioned three groups of screw steel fiber ultra-high performance concretes, the cohesive force of screw steel fiber and concrete substrate and straight Line steel fibre is compared, and cohesive force is obviously improved.The tensile strength of this kind of concrete is higher than traditional steel fiber reinforced concrete.And And since screw steel fiber from matrix when extracting, traditional steel fibre coagulation can be greatly improved in the process with " uncoiling " The deformability of soil.
And the preparation method, first cement, silicon ash, fine sand, silica flour, high efficiency water reducing agent are uniformly mixed, are conducive to diminishing Agent plays a role, and improves solid particles surface activation energy, improves water-reducing effect.After water is added in two batches, then steel fibre is added portionwise Dimension, stirs evenly.Finally obtained finished product, fiber are evenly distributed, good fluidity, are conducive to material molding and engineer application.
2. the performance test of screw steel fiber concrete：
Below by the screw steel fiber extracted in description of test the present embodiment of the single screw steel fiber in its matrix With the coupling effect between ultra-high performance concrete (UHPC).
Single screw steel fiber can be used for testing between single screw steel fiber and matrix in the extraction experiment in its matrix Adhesive property, used experimental method presses《Steel fiber reinforced concrete test method》(CECS13:89) it carries out.
Test use screw steel fiber ultra-high performance concrete material matrix, component include cement, silicon ash, fine sand, Water, silica flour, high efficiency water reducing agent.Three groups of tests are set altogether, and each component quality is as shown in table 6 below in every group of test, by each component The number of mass ratio provide.In experiment each test specimen inbuilt single steel fibre embedment length, be also given in Table 6. Every set product has 6 parallel samples.
The match ratio of 6 screw steel fiber ultra-high performance concrete material matrix of table
In this test, the preparation process of screw steel fiber concrete is as follows：
1) cement of mass fraction described in table 6, silicon ash, fine sand, water, silica flour, high efficiency water reducing agent, steel fibre weighing is standby With；
2) stirring will be added by cement, silicon ash, fine sand, silica flour, the high efficiency water reducing agent after the weighing of mass fraction described in table 6 In machine, dry mixing 2min, is uniformly mixed at a slow speed；
3) in the resulting dry batch of 2) step, the water of about the weighed total amount half of addition, moderate-speed mixer about 4min, then plus Enter remaining water, moderate-speed mixer about 5min, what is stirred evenly newly mixes ultra-high performance concrete (UHPC) mortar, i.e. this test In screw steel fiber concrete matrix；
The good mortar of mixing is poured into particular manufacturing craft, and good single screw steel fiber embedding in advance in a mold, is made Extract experiment test specimen.In the present embodiment, 3 set products, every group of 6 parallel test specimens, the buried depth point of screw steel fiber are poured altogether It Wei not 15mm, 20mm, 25mm.
The average mechanical property for measuring 3 groups of samples is as shown in table 7 below.
The average mechanical property of 7 various sample of table
Number Average pulling capacity/N Uncoiling pulling capacity/N Drawing energy/N.mm
2-1 191.5 199.1 2873
2-2 193.3 203.3 3905
2-3 184.4 193 4582
It is indicated above that screw steel fiber needs are drawn by " uncoiling " mode in ultra-high performance concrete matrix It pulls out, therefore better deformability and toughness can be provided for concrete.
In addition, extracting front and back through XCT scanning screw steel fiber also directed to above-mentioned UHPC mortar matrix in the present embodiment Test specimen external morphology.Simultaneously as a comparison, carrying out the extraction of single spiral steel fibre in the same way using C30 mortar as matrix Experiment, and the test specimen external morphology through XCT scanning screw steel fiber extraction front and back.Screw steel fiber from C30 mortar and Test specimen after extracting in UHPC mortar, the image after XCT is scanned are as shown in Figures 6 and 7 respectively.From fig. 6 it can be seen that After screw steel fiber is extracted from normal concrete (C30), original shape is maintained substantially, and matrix is extracted channel and is destroyed. And as shown in fig. 7, screw steel fiber after extracting in UHPC matrix, presents the form of uncoiling, matrix extract after channel, Substantially the shape of former screw steel fiber is completely maintained.Therefore screw steel fiber ultra-high performance concrete of the invention, with biography System steel fiber reinforced concrete material is compared, and matrix can provide enough anchor forces to fiber, plays the mechanical advantage of steel fibre, and two Person complements each other.Therefore, screw steel fiber concrete is prepared according to the method in 1., since screw steel fiber is from matrix When extraction, the deformability and toughness of material can be greatly improved in the process with " uncoiling ".
3. the regeneration monolith column manufacture of screw steel fiber pipe of concrete constraint：
After screw steel fiber concrete is prepared according to the method in 1., build up that round, rectangular or other are more for pouring Side shape pipe, maintenance molding, i.e., the pipe of the UHPFRC made of conventional linear steel fibre in alternative embodiment 1 or embodiment 2 are pressed According to recorded in embodiment 1 or embodiment 2 method manufacture can screw steel fiber pipe of concrete constraint regeneration monolith column. Since screw steel fiber concrete has better mechanical property, whole concrete column relative to common UHPFRC pipe Performance will also obtain being promoted significantly.
Above embodiments only illustrate that institute is for example, not to any restriction of embodiment.In actual implementation process In, operator can make many variations on the basis of above-mentioned explanation, and the variation amplified out therefrom is still created in the present invention It makes in scope of protection of the claims.

Claims (10)

1. a kind of very-high performance steel fiber concrete pipe constraint regeneration monolith column, which is characterized in that managed including UHPFRC, Regeneration concrete block and fresh concrete；External hoop constraint of the UHPFRC pipe as concrete column, regeneration concrete block In proportion after evenly mixing with fresh concrete, it pours and is filled in UHPFRC pipe, UHPFRC pipe is as permanent template and internal Concrete link into an integrated entity.
2. a kind of very-high performance steel fiber concrete pipe constraint regeneration monolith column according to claim 1, special Sign is, is formulated with reinforcing bar in the concrete in the UHPFRC pipe.
3. a kind of very-high performance steel fiber concrete pipe constraint regeneration monolith column according to claim 1, special Sign is, in the mix concrete in the UHPFRC pipe, the mass ratio of regeneration concrete block is no more than 40%, preferably 25% ~35%；Preferably, the block surface of regeneration concrete block is answered pollution-free and is cleaned up, and characteristic size is not more than the coagulation The 1/3 of earth pillar cross section short side direction size.
4. a kind of very-high performance steel fiber concrete pipe constraint regeneration monolith column according to claim 1, special Sign is, manufactures the concrete material of the UHPFRC pipe by cement, mineral admixture, fine sand, water, silica flour, water-reducing agent, steel Fiber composition, each component content are calculated according to the mass fraction, its ratio be：1000-1300 parts of cement, mineral admixture 100-650 Part, 900-1200 parts of fine sand, 100-300 parts of silica flour, 30-60 parts of water-reducing agent, 150-400 parts of water, 50-300 parts of steel fibre；Institute The mineral admixture stated is the mixture of silicon ash or silicon ash and flyash, blast-furnace cinder；In the steel fibre there is abnormity to cut Face fiber, profiled fibre include one of end hook fiber, undulated fibre or screw steel fiber or a variety of.
5. a kind of very-high performance steel fiber concrete pipe constraint regeneration monolith column according to claim 1, special Sign is that the built-in lining for tube body damage when preventing from pouring of the UHPFRC pipe of concrete column, the lining uses thin steel Pipe or braided fiber net.
6. a kind of very-high performance steel fiber concrete pipe constraint regeneration monolith column according to claim 5, special Sign is that steel fibre, carbon fiber, basalt fibre, vinal or polyethylene fiber are selected as in the braided fiber network optimization Dimension, the sheet steel pipe thickness is preferably 0.8mm-10mm.
7. a kind of very-high performance steel fiber concrete pipe constraint regeneration monolith column according to claim 1, special Sign is that the UHPFRC tube thickness is 20mm-120mm.
8. a kind of very-high performance steel fiber concrete pipe constraint regeneration monolith column according to claim 1, special Sign is that the cross-sectional shape of the UHPFRC pipe is rectangular, round or other polygons.
9. a kind of very-high performance steel fiber concrete pipe constraint regeneration monolith column according to claim 1, special Sign is that the axial compression ratio of the concrete column is no more than 0.65.
10. a kind of very-high performance steel fiber concrete pipe constraint regeneration monolith column according to claim 1, special Sign is, when UHPFRC manages not load-bearing, UHPFRC tube end uses flexible connection mode, and UHPFRC pipe is pre- with two leaf of column 10-80mm construction joint is stayed, after the completion of construction, using pitch or the perfusion sealing of high elastic rubber material；When UHPFRC pipe load-bearing When, using rigid connection, UHPFRC pipe is used by high-strength friction-type bolt and Node connectedness, or in node stitching portion UHPC mortar integration pouring molding.
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