CN109678433A - Ultrahigh-strength self-compacting microdilatancy concrete filled steel tube and preparation method thereof - Google Patents

Ultrahigh-strength self-compacting microdilatancy concrete filled steel tube and preparation method thereof Download PDF

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CN109678433A
CN109678433A CN201910133899.7A CN201910133899A CN109678433A CN 109678433 A CN109678433 A CN 109678433A CN 201910133899 A CN201910133899 A CN 201910133899A CN 109678433 A CN109678433 A CN 109678433A
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compacting
ultrahigh
concrete
steel tube
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CN109678433B (en
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丁庆军
包嘉诚
吴静
金宏程
彭程康琰
胡俊
周鹏
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Wuhan University of Technology WUT
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    • 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
    • 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
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses a kind of ultrahigh-strength self-compacting microdilatancy concrete filled steel tubes and preparation method thereof.Its composition is as follows in parts by weight: 580~680 parts of cement, 30~60 parts of fly ash micro-sphere, 25~50 parts of silicon ash, 20~35 parts of swelling agent, 700~750 parts of Machine-made Sand, 800~1050 parts of rubble, 0.4~1.2 part of reducing function material, 3.5~7 parts of additive, 120~160 parts of water, short 4~5.5 parts of the thin steel fibre of copper facing.The present invention replaces natural river sand to be enhanced the workability and density of concrete using its ball effect and micro aggregate effect using high-active flyash microballon and silicon ash using mountain flour as inertia spike, improve its homogenieity using the Machine-made Sand of high content stone powder.Expansible agent is configured using flyash and ardealite, improves intensity, while further decreasing air content using additive and improving compactness.The machine-made sand concrete of gained high content stone powder, working performance, mechanical property, volume stability and cracking resistance are excellent.

Description

Ultrahigh-strength self-compacting microdilatancy concrete filled steel tube and preparation method thereof
Technical field
The invention belongs to field of material technology, and in particular to a kind of ultrahigh-strength self-compacting microdilatancy concrete filled steel tube and its system Preparation Method.
Background technique
Carry forward vigorously construction of the West Region period in current positive value China, it is contemplated that the natural conditions on the more high and steep mountains in west area, One quality of lot of current west area urgent need is good, and good mechanical performance, cost economic is easy to the Large Span Bridges constructed, to sum up, Concrete filled steel tube arch bridge is the optimal selection for meeting numerous conditions.In general, preparing bridge High-performance clean water concrete needs Natural river sand is used, however, west area river sand resource is deficient, and is protection riverbed, is intended with local Machine-made Sand money abundant Source substitutes river sand.
Machine-made Sand is formed by hand breaking, and the fine of some partial size≤0.75 μm is inevitably introduced in production process Mountain flour and mud powder, the concrete prepared with this is to the large amount of adsorption of additive, and working performance of concrete and homogeneity are poor, concrete Easily occur taking off bottom and bleeding, and significantly increase the contraction of concrete, early stage is easy to crack, in this regard, national standard " highway bridge and culvert construction Technical specification " JTG TF50-2011 is made that limitation with the content of stone powder in Machine-made Sand to concrete.But take washing Machine-made Sand The measure of removal fine powder would seriously pollute the environment again, increase concrete raw material cost and project cost.Therefore to concrete Workability and compression strength propose high requirement, by external steel tube confinement after concrete hardening, if shrink it is bigger can generate it is de- Sky causes stress to concentrate.
Summary of the invention
It is an object of that present invention to provide a kind of ultrahigh-strength self-compacting microdilatancy steel prepared using high fine powder content Machine-made Sand Pipe concrete and preparation method thereof, working performance, mechanical property, volume stability and cracking resistance are excellent, have good Pumping, be easy to construct, and the control of content of stone powder is required it is lower, have important practical application value.
In order to achieve the above objectives, as follows using technical solution:
Ultrahigh-strength self-compacting microdilatancy concrete filled steel tube forms as follows in parts by weight:
580~680 parts of cement, 30~60 parts of fly ash micro-sphere, 25~50 parts of silicon ash, 20~35 parts of swelling agent, Machine-made Sand 700~750 parts, 800~1050 parts of rubble, 0.4~1.2 part of reducing function material, 3.5~7 parts of additive, water 120~160 Part, short 4~5.5 parts of the thin steel fibre of copper facing.
According to the above scheme, the mechanism grain fineness number modulus is 2.3~3.0, crush values≤7%, methylene blue number < 1.5, machine The mass content of fine powder is 8~20% in sand processed, fine powder partial size≤0.75 μm.
According to the above scheme, specific surface area >=1300m of the fly ash micro-sphere2/ kg, activity index >=101%, water requirement Than≤95%, crystal structure is amorphous state.
According to the above scheme, activity index >=105%, SiO of the silicon ash2Mass content >=90%, loss on ignition≤5%, Specific surface area >=16000m2/kg。
According to the above scheme, the rubble is limestone gravel or basaltic broken stone, 5~20 continuous gradings, flat-elongated particles Mass content≤8%, crush values≤10%.
According to the above scheme, the swelling agent is prepared in the following manner:
1) flyash, ardealite and solid sulfur ash are pressed into 5:(2.5~4.5): it is equal that the mass ratio of (1.5~2.5) weighs mixing It is even；
2) water-solid ratio 5:(1~2 are pressed) water stirring 3min is added；
3) feedstock vapor mixed is conserved, crosses 150 meshes, drying, coolant seal obtains the swelling agent.
According to the above scheme, the reducing function material is prepared in the following manner:
1) by Dipropylene glycol mono-n-butyl Ether, succinic anhydride and maleic anhydride with 1:(1.5~2): the molar ratio of (1.2~1.5) Mixing reacts 4~6h at 80~120 DEG C, is condensed into the polymer polymeric monomer A with reducing function；
2) by the magnesium slag of mass percent 50~70% and 30~50% dolomite after grinding is homogenized, 700~900 DEG C 50~80min of precalcining obtains prefabricated mixed powder；By prefabricated mixed powder and Fluorspar Powder 5:(1.5~3 in mass ratio) it mixes, 20~30min of aquation at 80~120 DEG C, using filter, purification, drying, then in 500~600 DEG C of low temperature calcinations 50~ 60min, after natural cooling, more than grinding to 60 μm of square hole screens≤5%, obtain expansion component B；Wherein quality hundred shared by MgO and CaO Score is respectively 60~70% and 30~40%；
3) after being homogenized the kaolin grinding of the sodium montmorillonite of mass percent 30~40% and 60~70%, 60 μm are controlled More than square hole screen≤5%, obtain the layer silicate mineral C with water retention property；
4) polymer polymeric monomer A is heated to 70~80 DEG C, then is separately added into expansion component B and layer silicate mineral C, Polymer emulsion is obtained after stirring evenly 20~30min of heat preservation, adds Na (OH)2Solution adjusts pH to neutrality, most afterwards through 50~ 60 DEG C of drying, grinding cross 200 meshes, obtain reducing function material.
According to the above scheme, the additive is Polycarboxylic Superplasticizer, is prepared in the following manner:
1) by methacrylic acid, poly glycol monomethyl ether and hydroquinone with molar ratio (3~5): (2~3.5): 1 ratio In example investment three-necked flask, stirring is warming up to 60~75 DEG C under the action of catalyst I, reacts 6~8h, keeps the temperature 0.5~1.5h, PH is adjusted to neutrality with sodium hydroxide, and liquid separation obtains methoxy polyethylene oxide methacrylate；Wherein, catalyst I is quality The p-methyl benzenesulfonic acid solution that concentration is 1~2%, the additive amount of catalyst I are the 5~10% of methacrylic acid quality；
2) by ethylene oxide with propylene oxide with (1~3): 1 molar ratio mixes at 100~150 DEG C, with potassium hydroxide As basic catalyst II, random copolymerization is carried out, copolymer is controlled in 80~90 polymerization scopes, obtains the embedding disconnected copolymerization of EPE Ether；
3) by the methoxy polyethylene oxide methacrylate, the embedding disconnected copolyether of EPE and chain-transferring agent by (2.5~ 4): (6~9): nitrogen is led in 1 molar ratio mixing, stirring, is warming up to 75~90 DEG C after a small amount of deionized water is added, reaction 2.5 ~4h obtains Polycarboxylic Superplasticizer with sodium hydroxide solution tune pH to 6~7.
According to the above scheme, the short thin steel fibre both ends of the copper facing are without end hook, and short circle is carefully straight, fracture elongation 14%, resist Tensile strength 1620MPa.
The preparation method of above-mentioned ultrahigh-strength self-compacting microdilatancy concrete filled steel tube, comprising the following steps:
1) by Machine-made Sand, rubble, preparatory dry mixing is uniformly mixed according to the ratio, and cement, fly ash micro-sphere, silicon ash, swollen is then added Swollen dose of continuation dry mixing is uniformly mixed；
2) additive is mixed with water, is poured slowly into 70% into agitated kettle, and start simultaneously at stirring, the duration 1 ~2min is added the short thin steel fibre of copper facing, is slow added into remaining additive and water, the concrete mixture mixed； The mixture mixed is poured into the mold, is conserved, ultrahigh-strength self-compacting microdilatancy concrete filled steel tube is obtained.
The present invention replaces river sand to prepare super-high strength steel pipe concrete using the Machine-made Sand of high fine powder content, when in Machine-made Sand When fine powder (mountain flour and mud powder) content is higher, gained concrete is to the large amount of adsorption of additive, working performance of concrete and homogeneous Property it is poor, easily there is the problem of taking off bottom and bleeding in concrete, and the present invention utilizes activity by incorporation active fly ash microballon and silicon ash " ball effect " of the fly ash micro-sphere in concrete can significantly reduce cement slurry shear stress, reduce concrete plastic viscosity, Characteristic with mineral diminishing；And its ultra-fine partial size, concrete density can be improved, improve cement slurry and thick bone in concrete Interface between material reduces harmful pore, improves concrete strength and corrosion resistance；Silicon ash has improvement cohesiveness, protects Water effect avoids the isolation excreting water phenomenon of the super-high strength steel pipe concrete of high fine powder content Machine-made Sand preparation；Active fly ash is micro- Pearl and the compound interfacial transition zone that can be also effectively improved inside concrete gelling slurry of silicon ash, it is solidifying to generate the lower C-S-H of Ca/Si Glue improves the ability for resisting external erosion, to improve the durability of concrete, and improves Machine-made Sand super-high strength steel pipe concrete Mobility and cohesiveness, be conducive to pumping construction.
The concrete shrinkage prepared using high fine powder content Machine-made Sand is big, and early stage is easy to crack, receives after concrete hardening outer The constraint of portion's steel pipe is come to nothing if shrinking bigger can generate, and concrete separates to form the mechanics that stress concentrates influence structure with steel pipe Performance reduces the service life of bridge.Swelling agent prepared by the present invention can generate dilatancy product in inside concrete aquation, fill out The pore and defect inside concrete gelling slurry are filled, volume stability of concrete energy is improved；The full water of incorporation is pre- simultaneously Wet haydites of book structure can slowly release water in concrete strength development process, do caused by reducing due to the decline of inside concrete humidity Dry contraction and self-constriction reduce concrete bracing sensibility；Additive of the invention also has reducing function, can significantly drop Low concrete gelling slurry internal capillary hole tension and effectively inhibit concrete shrinkage；Said effect synergistic effect, can effectively mention The cracking resistance of high gained concrete.
Polymer polymeric monomer in the reducing function material that the present invention uses with reducing function can reduce inside concrete Pore liquid surface tension reduces the compression generated by moisture evaporation, reduces concrete shrinkage, while enabling capillary wall The free water amount that migration evaporation occurs greatly reduces, and is largely converted into conjunction with water, reduces expansion component to extraneous curing water Dependence.And sodium montmorillonite therein and kaolin layer silicate mineral early period have water retaining function, with inside concrete The consumption of Free water starts to release water under the action of negative pressure, so that a higher moisture field of stable relative humidity is provided, and this A moisture field can provide safeguard for MgO and CaO expansion component, have the function of continued compensation contraction to concrete, to be promoted The volume stability and cracking resistance of high content stone powder machine-made sand concrete.It is logical can further to block pore for expanded product simultaneously Road reduces concrete pore rate, keeps concrete finer and close, and external erosion carbon dioxide is prevented to enter inside concrete.
In super-high strength steel pipe concrete pumping procedure, concrete and steel pipe inner wall friction, under the action of shear stress, easily Isolation, and concrete is required to have biggish mobility, plugging is avoided, water-retaining property is good, and self-compaction degree is high, and early strength rises Fastly.Additive of the present invention can be improved the degree of scatter of cement granules, improve the cementing properties of cement: with hydrated reaction of cement Progress, polyether lateral chain gradually occurs hydrolysis in cement strong basicity environment from main chain, improves the mobility of concrete Holding capacity.
The usual glue of machine-made sand self-compacting concrete is smaller, increases with intensity, and brittleness constantly increases, close to its pole When limiting bearing capacity, procreation, the extension of high-strength concrete internal tiny crack cause it that brittle break easily occurs.The present invention is using additional The short thin steel fibre of copper facing can effectively prevent the extension of internal tiny crack and macro by its random distribution in original concrete The occurrence and development for seeing crack constrain transversely deforming of the concrete when being pressurized, have postponed destructive process, mentioned to a certain extent High high-strength concrete anti-deformation and compression strength.
Compared with prior art, the invention has the benefit that
The present invention prepares superelevation strength micro expansion concrete filled steel tube, and preferably high activity, mine using high fine powder content Machine-made Sand The active fly ash microballon of object diminishing and the silicon ash for having the viscous function of water conservation tune effectively improve high fine powder as mineral admixture Content Machine-made Sand prepares the existing isolation of superelevation strength micro expansion concrete filled steel tube, excreting water phenomenon, improves the cohesiveness of slurry, changes It has been apt to cementitious material to the wrapped of aggregate, has increased the fluidity of concrete, substantially improve its pumpability, be easy to construct.
The high performance additive that the present invention develops is remarkably improved the working performance and mobility holding capacity of concrete, will The gel particles of inside concrete are evenly dispersed, reduce cement consumption and folk prescription concrete water amount, improve the closely knit of concrete Degree and intensity；Alkyl, polyether decrement group on water-reducing agent can reduce the surface tension of hole solution in concrete mortar, reduce mixed The contraction for coagulating soil makes the concrete filled steel tube of preparation have self-compacting ability, improves superelevation strength micro expansion concrete filled steel tube engineering Speed of application and construction quality.
Superelevation strength micro expansion concrete filled steel tube technology of preparing of the invention will compensate and conserve skill in contraction principle and concrete Art, which is jointly used in, prepares high fine powder content machine-made sand self-compacting superelevation strength micro expansion concrete filled steel tube, and the present invention is using silicon ash The cohesiveness of concrete is improved with fly ash micro-sphere, is avoided in pumping procedure on the basis of isolation layering, further directed to high thin The problems such as concrete shrinkage of powder content Machine-made Sand preparation is big, and early stage is easy to crack, is shunk using swelling agent compensating concrete, refinement Pore structure, preparing reducing function material reduces inside concrete pore liquid surface tension, reduces the pressure generated by moisture evaporation Stress reduces concrete shrinkage, while the free water amount for enabling capillary wall that migration evaporation occurs greatly reduces, most of to turn It turns to and combines water, reduce dependence of the expansion component to extraneous curing water；And preferably high-strength porous light aggregate can be in concrete Water is slowly released in early strength development process, dry contraction and self-constriction caused by reducing due to the decline of inside concrete humidity, Concrete bracing sensibility is reduced, superelevation strength micro expansion concrete filled steel tube the anti-of full stage from early stage to later period is realized and opens Split performance boost.
The characteristics of present invention is relatively low for high performance concrete glue, and brittleness is higher, is also easy to produce micro-crack, by a large amount of Experimental comparison's different steel fiber selects the short thin steel fibre of copper facing.The fiber both ends are without end hook, and length is shorter, in concrete Can be with slurry disorderly to arrangement, and be not easy mutually to overlap and form scaffolding structure, cause stress to concentrate.The short thin steel fibre dispersibility of copper facing It is good, working performance of concrete is influenced it is lower, unrest to be arranged in it is internal concrete structure all directions can all be applied it is certain Constraint reduces the risk of concrete early hydration temperature rise cracking.
Specific embodiment
Following embodiment further illustrates technical solution of the present invention, but not as limiting the scope of the invention.
Cement uses high 42.5 ordinary portland cement of Sheng PO；Silicon ash is purchased from Chengdu Ming Ling Science and Technology Ltd., lives Sex index is 105%, SiO2Mass content is 92%, loss on ignition 4.5%, specific surface area 17000m2/kg；Fly ash micro-sphere It builds up new material Science and Technology Ltd. by Tianjin to provide, specific surface area 1470m2/ kg, activity index 103%, water demand ratio It is 92%, amorphous state；Mechanism grain fineness number modulus is 2.74, crush values 6.7%, and fine powder mass content is 14.3%, methylenum careuleum Value is 1.4；Rubble is the basaltic broken stone of 5~20mm continuous grading, and flat-elongated particles mass content is 7%, crush values 6%； The short thin steel fibre fracture elongation of copper facing is 14%, tensile strength 1620MPa；Water is ordinary tap water.
Examples 1 to 2
It is a kind of to utilize high fine powder content Machine-made Sand preparation superelevation strength micro expansion concrete filled steel tube (C30~C40), preparation side Method includes the following steps:
1) each raw material is weighed by proportion described in table 1-1；
2) weighed Machine-made Sand, rubble dry mixing 1min in agitated kettle is poured into according to the ratio to be uniformly mixed, then be added cement, Fly ash micro-sphere, silicon ash, swelling agent, reducing function material continue dry-mixed 1.5min and are uniformly mixed, and then by additive and water Mixing, is poured slowly into 70% into agitated kettle, and start simultaneously at stirring, and weighed steel fibre is added in duration 2min, and It is slowly added to remaining water and additive, continues to stir, duration 1min obtains uniform mixture, finally pours into the mold, The superelevation strength micro expansion concrete filled steel tube that standard curing is prepared after 1d demoulding to get the high fine powder content Machine-made Sand.
3) preparation method of the reducing function material described in Examples 1 to 2 is the following steps are included: 1) by dipropylene glycol list Butyl ether, succinic anhydride and maleic anhydride are mixed with the molar ratio of 1:1.5:1.2, react 6h at 100 DEG C, and being condensed into has decrement The polymer polymeric monomer A of function；It 2) is respectively 73% magnesium slag and 27% dolomite after grinding is homogenized by mass percent, 900 DEG C of precalcining 65min mix prefabricated mixed powder 5:2 in mass ratio with Fluorspar Powder, then the aquation at 80 DEG C 30min, using filter, purification, drying, then then at 550 DEG C of low temperature calcination 60min, after natural cooling, grinding to 60 μm of sides Hole tails over≤5%, obtains expansion component B, and wherein mass percent shared by MgO and CaO is respectively 60% and 40%；3) by quality hundred Point than being respectively 34% sodium montmorillonite and after 66% kaolin grinding homogenizing, control more than 60 μm of square hole screens≤5%, had There is the layer silicate mineral C of water retention property；4) step 1)~3 are weighed by following mass percent) made from each component, wherein Polymer polymeric monomer A is heated to 70 by polymer polymeric monomer A42%, expansion component B30%, layer silicate mineral C 28% DEG C, then it is separately added into expansion component B and layer silicate mineral C, it stirs evenly and obtains polymer emulsion after keeping the temperature 25min, then plus Enter Na (OH)2Solution adjusts PH to neutrality, most dries afterwards through 60 DEG C, grinding crosses 200 meshes, obtains the interior maintenance reducing function material Material.
4) preparation method of the additive described in Examples 1 to 2 is the following steps are included: 1) by methacrylic acid, poly- second Glycol monomethyl ether and hydroquinone under the action of catalyst I to stir in the ratio investment three-necked flask of molar ratio 4.5:2:1 65 DEG C are warming up to, 8h is reacted, keeps the temperature 1.5h, with liquid separation after naoh treatment, until solution is neutrality, wherein catalyst I is The p-methyl benzenesulfonic acid solution that mass concentration is 1%, the additive amount of catalyst I are the 7% of methacrylic acid quality, thus obtain methoxy Ethyl polyethylene-oxide methacrylate.By ethylene oxide and propylene oxide with the molar ratio of 2.5:1 at 130 DEG C, with hydrogen-oxygen Change potassium as basic catalyst II, carry out random copolymerization, controls copolymer in 80~90 polymerization scopes, obtain polycarboxylic acids and subtract Aqua molecular side chain monomer (the embedding disconnected copolyether of EPE)；Polycarboxylate water-reducer molecule main chain, polycarboxylic acids will be subtracted in four-neck flask Aqua molecular side chain monomer (the embedding disconnected copolyether of EPE) and chain-transferring agent are mixed by the molar ratio of 2:9:1, and nitrogen is led in stirring, are added 85 DEG C are warming up to after a small amount of deionized water, reacts 3h.Reaction obtains poly- carboxylic with 40% sodium hydroxide solution tune PH to 6 afterwards to terminal Acids high efficiency water reducing agent.
5) preparation method of the swelling agent described in Examples 1 to 2 is the following steps are included: 1) by flyash, ardealite and Solid sulfur ash is weighed by the mass ratio of 5:3:1.5 and is uniformly mixed.2) water is added by water-solid ratio 5:1 and stirs 3min.3) it will mix Feedstock vapor maintenance, crosses 150 meshes, drying, and coolant seal obtains the swelling agent.
The performance test results of the resulting superelevation strength micro expansion concrete filled steel tube of Examples 1 to 2 are shown in Table 1-2.
Superelevation strength micro expansion concrete filled steel-tubular (kg/m described in table 1-1 Examples 1 to 23)
Superelevation strength micro expansion concrete filled steel tube performance described in table 1-2 Examples 1 to 2
Embodiment 3~4
It is a kind of to utilize high fine powder content Machine-made Sand preparation superelevation strength micro expansion concrete filled steel tube (C120~C140), preparation Method includes the following steps:
1) each raw material is weighed by proportion described in table 2-1；
2) weighed Machine-made Sand, rubble are poured into dry mixing 1min in agitated kettle to be uniformly mixed according to the ratio, is then added and weighs Cement, fly ash micro-sphere, silicon ash, swelling agent, decrement material continue dry-mixed 1min and be uniformly mixed, and then by additive and water Mixing, is poured slowly into agitated kettle, and start simultaneously at stirring, the duration be 2min the duration, weighed steel fibre is added Dimension, and it is slowly added to remaining water and additive, continue to stir, duration 1min obtains uniform concrete mixture, most After-pouring enters mould, the self-compaction cracking resistance clear water coagulation that standard curing is prepared after 1d demoulding to get the high fine powder content Machine-made Sand Soil.The resulting self-compaction cracking resistance clear-water concrete performance such as table 2-2 of embodiment 3~4.
3) preparation method of the reducing function material described in Examples 1 to 2 is the following steps are included: 1) by dipropylene glycol list Butyl ether, succinic anhydride and maleic anhydride are mixed with the molar ratio of 1:2:1.4, react 5h at 120 DEG C, and being condensed into has decrement function The polymer polymeric monomer A of energy；It 2) is respectively 55% magnesium slag and 45% dolomite after grinding is homogenized by mass percent, 900 DEG C of precalcining 60min mix prefabricated mixed powder 5:2 in mass ratio with Fluorspar Powder, then the aquation at 110 DEG C 30min, using filter, purification, drying, then then at 550 DEG C of low temperature calcination 55min, after natural cooling, grinding to 60 μm of sides Hole tails over≤5%, obtains expansion component B, and wherein mass percent shared by MgO and CaO is respectively 66% and 34%；3) by quality hundred Point than being respectively 40% sodium montmorillonite and after 60% kaolin grinding homogenizing, control more than 60 μm of square hole screens≤5%, had There is the layer silicate mineral C of water retention property；4) step 1)~3 are weighed by following mass percent) made from each component, wherein Polymer polymeric monomer A is heated to 80 by polymer polymeric monomer A48%, expansion component B 32%, layer silicate mineral C 20% DEG C, then it is separately added into expansion component B and layer silicate mineral C, it stirs evenly and obtains polymer emulsion after keeping the temperature 25min, then plus Enter Na (OH)2Solution adjusts PH to neutrality, most dries afterwards through 60 DEG C, grinding crosses 200 meshes, obtains the interior maintenance reducing function material Material.
4) preparation method of the additive described in Examples 1 to 2 is the following steps are included: 1) by methacrylic acid, poly- second Glycol monomethyl ether and hydroquinone under the action of catalyst I to stir and rise in the ratio investment three-necked flask of molar ratio 4:3:1 Temperature reacts 6h to 75 DEG C, keeps the temperature 1.5h, and with liquid separation after naoh treatment, until solution is neutrality, wherein catalyst I is matter The p-methyl benzenesulfonic acid solution that concentration is 1% is measured, the additive amount of catalyst I is the 8% of methacrylic acid quality, thus obtains methoxyl group Polyethylene glycol oxide methacrylate.By ethylene oxide and propylene oxide with the molar ratio of 2.5:1 at 120 DEG C, with hydroxide Potassium carries out random copolymerization as basic catalyst II, controls copolymer in 80~90 polymerization scopes, obtains polycarboxylic acids diminishing Agent molecule side chain monomer (the embedding disconnected copolyether of EPE)；It will be by polycarboxylate water-reducer molecule main chain, polycarboxylic acids diminishing in four-neck flask Agent molecule side chain monomer (the embedding disconnected copolyether of EPE) and chain-transferring agent are mixed by the molar ratio of 3.5:8:1, and nitrogen is led in stirring, are added 80 DEG C are warming up to after a small amount of deionized water, reacts 2.5h.Reaction must be gathered with 40% sodium hydroxide solution tune PH to 6 afterwards to terminal Carboxylic acid analog high efficiency water reducing agent.
5) preparation method of swelling agent described in embodiment 3~4 is the following steps are included: 1) by flyash, ardealite and Solid sulfur ash is weighed by the mass ratio of 5:3:2 and is uniformly mixed.2) water is added by water-solid ratio 5:2 and stirs 3min.3) original that will be mixed Expect steam curing, cross 150 meshes, drying, coolant seal obtains the swelling agent.
The ultrahigh-strength self-compacting microdilatancy concrete filled steel-tubular (kg/m of table 2-1 embodiment 3~43)
3~4 gained ultrahigh-strength self-compacting microdilatancy concrete filled steel tube performance of table 2-2 embodiment
The above results show the present invention different intensity grades can be designed according to Practical Project demand (C100~ C140), the present invention using the preparation of high fine powder content Machine-made Sand ultrahigh-strength self-compacting microdilatancy concrete filled steel tube its air content≤ 2.0%, the equal < 15mm of loss of the slump and divergence after slump > 240mm, divergence > 600mm, 2h have good Workability can preferably avoid isolation lamination, shrinking percentage≤2 × 10 90d conducive to pumping-4, cracking resistance grade is V grade；With excellent Different self-compaction cracking resistance can be improved the speed of application and construction quality of concrete works, meet super-high strength steel pipe concrete The requirement of the designing quality of bridge, and raw material sources are extensive, requires the control of Machine-made Sand content of stone powder low, and preparation process is simple.

Claims (10)

1. ultrahigh-strength self-compacting microdilatancy concrete filled steel tube, it is characterised in that composition is as follows in parts by weight:
580~680 parts of cement, 30~60 parts of fly ash micro-sphere, 25~50 parts of silicon ash, 20~35 parts of swelling agent, Machine-made Sand 700~ 750 parts, 800~1050 parts of rubble, 0.4~1.2 part of reducing function material, 3.5~7 parts of additive, 120~160 parts of water, copper facing 4~5.5 parts of short thin steel fibre.
2. ultrahigh-strength self-compacting microdilatancy concrete filled steel tube as described in claim 1, it is characterised in that the mechanism grain fineness number mould Number is 2.3~3.0, crush values≤7%, methylene blue number < 1.5, and the mass content of fine powder is 8~20% in Machine-made Sand, fine silt Diameter≤0.75 μm.
3. ultrahigh-strength self-compacting microdilatancy concrete filled steel tube as described in claim 1, it is characterised in that the fly ash micro-sphere Specific surface area >=1300m2/ kg, activity index >=101%, water demand ratio≤95%, crystal structure are amorphous state.
4. ultrahigh-strength self-compacting microdilatancy concrete filled steel tube as described in claim 1, it is characterised in that the activity of the silicon ash refers to >=105%, SiO of number2Mass content >=90%, loss on ignition≤5%, specific surface area >=16000m2/kg。
5. ultrahigh-strength self-compacting microdilatancy concrete filled steel tube as described in claim 1, it is characterised in that the rubble is limestone Rubble or basaltic broken stone, 5~20 continuous gradings, mass content≤8% of flat-elongated particles, crush values≤10%.
6. ultrahigh-strength self-compacting microdilatancy concrete filled steel tube as described in claim 1, it is characterised in that the swelling agent is by following Mode is prepared:
1) flyash, ardealite and solid sulfur ash are pressed into 5:(2.5~4.5): the mass ratio of (1.5~2.5), which weighs, to be uniformly mixed；
2) water-solid ratio 5:(1~2 are pressed) water stirring 3min is added；
3) feedstock vapor mixed is conserved, crosses 150 meshes, drying, coolant seal obtains the swelling agent.
7. ultrahigh-strength self-compacting microdilatancy concrete filled steel tube as described in claim 1, it is characterised in that the reducing function material It is prepared in the following manner:
1) by Dipropylene glycol mono-n-butyl Ether, succinic anhydride and maleic anhydride with 1:(1.5~2): the molar ratio mixing of (1.2~1.5), 4~6h is reacted at 80~120 DEG C, is condensed into the polymer polymeric monomer A with reducing function；
2) by the magnesium slag of mass percent 50~70% and 30~50% dolomite after grinding is homogenized, 700~900 DEG C are pre-calcined It burns 50~80min and obtains prefabricated mixed powder；By prefabricated mixed powder and Fluorspar Powder 5:(1.5~3 in mass ratio) it mixes, 80~ 20~30min of aquation at 120 DEG C, using filter, purification, drying, then in 500~600 DEG C of 50~60min of low temperature calcination, warp After natural cooling, more than grinding to 60 μm of square hole screens≤5%, obtain expansion component B；Wherein mass percent shared by MgO and CaO is distinguished For 60~70% and 30~40%；
3) after being homogenized the kaolin grinding of the sodium montmorillonite of mass percent 30~40% and 60~70%, 60 μm of square holes are controlled ≤ 5% is tailed over, the layer silicate mineral C with water retention property is obtained；
4) polymer polymeric monomer A is heated to 70~80 DEG C, then is separately added into expansion component B and layer silicate mineral C, stirred Polymer emulsion uniformly is obtained after 20~30min of heat preservation, adds Na (OH)2Solution adjusts pH to neutrality, most afterwards through 50~60 DEG C Drying, grinding cross 200 meshes, obtain reducing function material.
8. ultrahigh-strength self-compacting microdilatancy concrete filled steel tube as described in claim 1, it is characterised in that the additive is poly- carboxylic Acids high efficiency water reducing agent, is prepared in the following manner:
1) by methacrylic acid, poly glycol monomethyl ether and hydroquinone with molar ratio (3~5): (2~3.5): 1 ratio is thrown Enter in three-necked flask, stirring is warming up to 60~75 DEG C under the action of catalyst I, reacts 6~8h, keeps the temperature 0.5~1.5h, uses hydrogen Sodium oxide molybdena adjusts pH to neutrality, and liquid separation obtains methoxy polyethylene oxide methacrylate；Wherein, catalyst I is mass concentration For 1~2% p-methyl benzenesulfonic acid solution, the additive amount of catalyst I is the 5~10% of methacrylic acid quality；
2) by ethylene oxide with propylene oxide with (1~3): 1 molar ratio mixes at 100~150 DEG C, using potassium hydroxide as Basic catalyst II carries out random copolymerization, controls copolymer in 80~90 polymerization scopes, obtains the embedding disconnected copolyether of EPE；
3) the methoxy polyethylene oxide methacrylate, the embedding disconnected copolyether of EPE and chain-transferring agent are pressed into (2.5~4): (6 ~9): nitrogen is led in 1 molar ratio mixing, stirring, is warming up to 75~90 DEG C after a small amount of deionized water is added, reacts 2.5~4h, Polycarboxylic Superplasticizer is obtained with sodium hydroxide solution tune pH to 6~7.
9. ultrahigh-strength self-compacting microdilatancy concrete filled steel tube as described in claim 1, it is characterised in that the short thin steel of copper facing is fine Both ends are tieed up without end hook, short circle is carefully straight, fracture elongation 14%, tensile strength 1620MPa.
10. the preparation method of any one of the claim 1-9 ultrahigh-strength self-compacting microdilatancy concrete filled steel tube, including following step It is rapid:
1) by Machine-made Sand, rubble, preparatory dry mixing is uniformly mixed according to the ratio, and cement, fly ash micro-sphere, silicon ash, swelling agent is then added Continue dry mixing to be uniformly mixed；
2) additive is mixed with water, is poured slowly into 70% into agitated kettle, and start simultaneously at stirring, the duration be 1~ 2min is added the short thin steel fibre of copper facing, is slow added into remaining additive and water, the concrete mixture mixed；
3) mixture mixed poured into the mold, conserved, obtain ultrahigh-strength self-compacting microdilatancy concrete filled steel tube.
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CN110937842A (en) * 2019-12-18 2020-03-31 中建商品混凝土有限公司 Additive for improving crack resistance and thixotropy of super high-rise pumped concrete
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CN113773006A (en) * 2021-09-16 2021-12-10 中交公路长大桥建设国家工程研究中心有限公司 Ultrahigh-strength lightweight concrete and preparation method thereof
CN115321915A (en) * 2022-08-25 2022-11-11 四川精益达工程检测有限责任公司 C120 ultrahigh-strength compensation shrinkage self-compacting concrete filled steel tube and preparation method thereof
CN115504754A (en) * 2022-10-18 2022-12-23 中铁大桥局集团有限公司 Steel pipe concrete based on solid waste expansion and preparation method thereof
CN115504754B (en) * 2022-10-18 2023-06-20 中铁大桥局集团有限公司 Steel pipe concrete based on solid waste expansion and preparation method thereof

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