CN106316294A - Reactive powder concrete and preparing method and purpose thereof - Google Patents

Reactive powder concrete and preparing method and purpose thereof Download PDF

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Publication number
CN106316294A
CN106316294A CN201610715837.3A CN201610715837A CN106316294A CN 106316294 A CN106316294 A CN 106316294A CN 201610715837 A CN201610715837 A CN 201610715837A CN 106316294 A CN106316294 A CN 106316294A
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Prior art keywords
rpc
parts
steel fiber
diluent
modified
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CN201610715837.3A
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CN106316294B (en
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李云军
刘建
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Chongqing Tianwei Development Green Building Technology Co Ltd
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Chongqing Tianwei Development Green Building Technology Co Ltd
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Classifications

    • 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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/023—Chemical treatment
    • 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
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

Abstract

The invention provides reactive powder concrete and preparing method and purpose thereof. The reactive powder concrete is prepared from 400-1000 parts of cement, 100-500 parts of modified superfines, 50-200 parts of modified steel fiber, 900-1300 parts of quartz sand, 100-220 parts of quartz powder, 10-30 parts of admixture, and 100-250 parts of water. According to characteristics of inorganic whisker which it has no macroscopic defect, its crystal intensity approximates theoretical value of intact crystal, and mechanical strength is equivalent to force of neighboring atoms, the invention, by adding whisker, improves RPC-related properties with compressive strength and rupture strength up to construction requirements; by modification of steel fiber, it improves wrapping of slurry on steel fiber, enhances fracture energy and strength increase of RPC product and reduces interface microcrack.

Description

A kind of RPC and preparation method thereof and purposes
Technical field
The present invention relates to concrete material field, particularly relate to a kind of RPC and preparation method thereof with On the way.
Background technology
RPC (Reactive Powder Concrete, hereinafter referred to as RPC) is that continue high-strength, high-performance is mixed After solidifying soil, the New Building Materials that a kind of mechanical property of appearance, endurance quality are the most superior.It is by DSP (Densified System containing ultra-fine Particles) material and fibre reinforced materials are combined mutually High Technique Concrete.In use, there is steel fibre and be combined with slurry not good enough in existing RPC；Although RPC component backfin than with Normal concrete is compared and is greatly improved, but RPC is after aquation, and interface micro-crack exists the most in a large number, deposits inside slurry At substantial amounts of fine lattice defect, the intensity having a strong impact on RPC plays.
Summary of the invention
The shortcoming of prior art in view of the above, it is an object of the invention to provide a kind of RPC and Preparation method and purposes, be used for improving that RPC steel fibre in prior art is drawn out easily, energy to failure is relatively low, intensity increases The problems such as long bad, interface micro-crack, lattice defect.
For achieving the above object and other relevant purposes, first aspect present invention provides a kind of RPC, bag Include the raw material of following weight portion: cement 400～1000 parts, modified superfine powder 100～500 parts, modified steel fiber 50～200 parts, Quartz sand 900～1300 parts, silica flour 100-220 part, additive 10～30 parts, water 100～250 parts.
Preferably, described cement is the one or more combination P.052.5, in P.O42.5, P.I52.5, P.I42.5.
Further, the particle diameter of described quartz sand is 40-200 mesh, SiO in quartz sand2Mass content >=97%.
Further, the particle diameter of described silica flour is 400-1000 mesh, SiO in silica flour2Mass content >=97%.
Further, described additive is polycarboxylate water-reducer, water-reducing rate >=30%.
Further, described modified superfine powder includes the raw material of following weight portion: slag powders 0～30 parts, silicon powder 10～ 30 parts, whisker 1～5 parts, coupling agent diluent 0.2～0.6 part.
Preferably, described slag powders is S95 grade slag powder, meets that " GB/T 18046-2008 is in cement and concrete Ground granulated blast furnace slag ".
Preferably, the specific surface area >=20m of described silicon powder2/kg。
Preferably, described whisker is the one or more combination in calcium sulfate crystal whiskers, calcium carbonate crystal whisker, aluminium borate whisker, Its draw ratio is more than 20.
Preferably, described coupling agent diluent is silane coupler diluent or titanate coupling agent diluent, and silane is even Connection dilution agent liquid is the mixed liquor of silane coupler and dehydrated alcohol, and titanate coupling agent diluent is titanate coupling agent and liquid The mixed liquor of paraffin body.
It is highly preferred that the content of silane coupler is 1-5wt% in described silane coupler diluent；Described titanate esters is even In connection dilution agent liquid, the content of titanate coupling agent is 10-50wt%.
It is highly preferred that described silane coupler is KH560 etc., described titanate coupling agent is TMS200 etc..
Further, described modified steel fiber includes the raw material of following weight portion: steel fibre 5～10 parts, silane coupler Diluent 0.01～0.5 part.
Further, one or both combinations during described steel fibre is copper coating steel fibre, stainless steel fibre.
Preferably, described steel fibre a diameter of 0.1～0.25mm, a length of 12～15mm.
Preferably, described silane coupler diluent is the mixed liquor of silane coupler, dehydrated alcohol, silane in diluent The mass concentration of coupling agent is 1-5%.
It is highly preferred that the mass concentration of silane coupler is 2.5% in described silane coupler diluent.
It is highly preferred that described silane coupler is aminopropyl triethoxysilane, glycydoxy trimethoxy One or more combination in base silane, mercaptopropyltriethoxysilane.
Second aspect present invention provides the preparation method of above-mentioned RPC, comprises the steps:
1) prepare modified steel fiber: by formula ratio, silane coupler is sprayed to steel fiber surface, be dried, prepare described in change Property steel fibre, standby；The mode being dried can be dry in the sun or indoor seasoning, it is therefore an objective to steel fiber surface is dried, and allows carboxyl Fully it is precipitated to steel fiber surface, forms uniform silane film.
2) the modified superfine powder of preparation: by formula ratio by slag powders, silicon powder, whisker mixing, grinding, add coupling agent dilution Liquid carries out surface modification, prepares described modified superfine powder.
3) RPC slurry is prepared: by formula ratio by quartz sand, silica flour, step 1) modified steel for preparing is fine Dimension, cement, step 2) prepare modified superfine powder mixing, stirring and evenly mixing, standby；Additive is added to the water formation additive water Solution, then the aqueous solution of this additive is added in said mixture, prepare described RPC slurry.
4) mould is entered: by step 3) the RPC slurry for preparing puts into mould, and stand and slurry is solidified.
5) just support: by step 4) in solidification RPC put into fog room together with mould, carry out maintenance, knot Room temperature it is cooled to after bundle.
6) demoulding: RPC and mould thereof are removed fog room, the demoulding.
7) support eventually: move to the RPC after the demoulding fog room carries out maintenance, after terminating, be cooled to room temperature.
8) by step 7) RPC for preparing moves to indoor, at room temperature natural moisture-keeping maintaining more than 7 days, system Obtain RPC finished product.
Further, step 4) in, time of repose is 4～8h.
Further, step 5) and step 7) in, maintenance method is steam curing or steam press maintenance.
Further, step 5) and step 7) in maintenance method when being steam curing, step 5) in be warming up to 40 ± 5 DEG C, step 7) in be warming up to 70 ± 5 DEG C, programming rate≤12 DEG C/h, maintenance is cooled to room temperature, cooling rate≤15 after terminating DEG C/h, control the cataclysm of its internal stress.
Third aspect present invention provides above-mentioned RPC purposes in architectural engineering.Reactive powder of the present invention Concrete is at prestressed structure, prefabricated components, concrete filled steel tube, large-size components, abrasion-proof corrosion-proof arbor, radio-resistant structure etc. In all have been widely used.
As it has been described above, a kind of RPC of the present invention and preparation method thereof and purposes, there is following useful effect Really: steel fibre by silane coupler surface modification, is increased the slurry bond stress to steel fibre by the present invention；Whisker is mixed silicon In micropowder, and by coupling agent modified, improve concrete interface, and utilize that diameter of whiskers is the least, non-nuclear density gauge, atom row Row high-sequential, intensity, close to the theoretical value of perfect crystal, mechanical strength advantages of higher, improve the intensity of RPC, elastic modelling quantity Deng.
Detailed description of the invention
Below by way of specific instantiation, embodiments of the present invention being described, those skilled in the art can be by this specification Disclosed content understands other advantages and effect of the present invention easily.The present invention can also be by the most different concrete realities The mode of executing is carried out or applies, the every details in this specification can also based on different viewpoints and application, without departing from Various modification or change is carried out under the spirit of the present invention.
Embodiment 1
A kind of RPC, including the raw material of following weight portion:
Cement 460 parts, modified superfine powder 450 parts, modified steel fiber 128 parts, quartz sand 1180 parts, silica flour 180 parts, outer Add agent 23 parts, 167 parts of water.
The raw material of modified steel fiber and weight ratio are copper plated steel fiber: aminopropyl triethoxysilane coupling agent diluent= 10:0.3, steel fibre a diameter of 0.1～0.25mm, a length of 12～15mm, raw material and the weight ratio of modified superfine powder are slag Powder: silicon powder: calcium sulfate crystal whiskers: aminopropyl triethoxysilane coupling agent diluent=10:10:2.5:0.4.Cement is common Silicate 52.5 class g cement (meets " GB175-2007 common portland cement ")；Slag powders is that S95 level (meets " GB/ T18046-2008 ground granulated blast furnace slag in cement and concrete ")；Additive be polycarboxylate water-reducer (water-reducing rate >= 30%, meet " JG/T 223-2007 polycarboxylate high performance water-reducing agent ").
The preparation method of above-mentioned RPC material comprises the steps:
1) press formula ratio to mix, the steel fibre after surface clean, silane coupler diluent specifically, by silane coupled Agent dehydrated alcohol is diluted to the diluent that concentration is 2.5wt% of silane coupler, is uniformly sprayed to the steel fibre spread out Surface, dry in the sun 60 minutes, treat dry tack free, allow carboxyl fully be precipitated to steel fiber surface, prepare described modified steel fiber.
2) press formula ratio slag powders, silicon powder, whisker to be mixed, spray into silane coupler KH560 diluent (silane coupled Agent KH560 and the mixed liquor of dehydrated alcohol, in diluent, the content of silane coupler KH560 is 2.5wt%), grinding 10- 15min so that each material is sufficiently mixed, prepares described modified superfine powder.
3) pressing formula ratio will be by formula ratio by quartz sand, silica flour, step 1) prepare modified steel fiber, cement, step 2) the modified superfine powder mixing prepared, stirs 3～8 minutes；By formula ratio, additive is mixed with water so that additive is diluted Become aqueous solution, then this aqueous solution is added in said mixture, stir 2～5 minutes, prepare described RPC slurry Body.
4) mould is entered: by step 3) the RPC slurry for preparing puts into mould, and stand 6h and slurry is solidified.
5) just support: by step 4) in the RPC of solidification by the ramp of 12 DEG C/h to 40 ± 5 DEG C, and protect Hold this temperature steam maintenance 24h, then be cooled to room temperature by the speed of 15 DEG C/h.
6) demoulding: RPC and mould thereof are removed steam-curing chamber, the demoulding.
7) support eventually: the RPC after the demoulding is moved in steam-curing chamber, by the ramp of 12 DEG C/h extremely 70 ± 5 DEG C, steam curing 72h, then it is cooled to room temperature by the speed of 15 DEG C/h.
8) by step 7) RPC for preparing moves to indoor, at room temperature natural moisture-keeping maintaining more than 7 days, system Obtain RPC finished product.
Gained RPC test specimen performance is: comprcssive strength 135.7MPa, rupture strength 20.3MPa.
Embodiment 2
A kind of RPC, including the raw material of following weight portion:
Cement 480 parts, modified superfine powder 400 parts, modified steel fiber 156 parts, quartz sand 1150 parts, silica flour 200 parts, outer Add agent 22 parts, 170 parts of water.
The raw material of modified steel fiber and weight ratio are stainless steel fibre: glycydoxy trimethoxy silane is dilute Release liquid=10:0.25, steel fibre a diameter of 0.1～0.25mm, a length of 12～15mm；The raw material of modified superfine powder and weight ratio For slag powders: silicon powder: calcium sulfate crystal whiskers: aminopropyl triethoxysilane coupling agent diluent=10:20:3:0.5.Cement is Normal silicate 42.5 class g cement and 52.5 class g cement mixture (meeting " GB175-2007 common portland cement ")；Slag powders For S95 level (meeting " GB/T 18046-2008 ground granulated blast furnace slag in cement and concrete ")；Additive is poly-carboxylic Acid water reducer (water-reducing rate >=30% meets " JG/T 223-2007 polycarboxylate high performance water-reducing agent ").
The preparation method of above-mentioned RPC material comprises the steps:
1) press formula ratio to mix, stainless steel fibre, silane coupler specifically, by dilute for silane coupler dehydrated alcohol Release the diluent that concentration is 2.5wt% to silane coupler, be uniformly sprayed to the steel fiber surface spread out, dry in the sun 60 points Clock, treats dry tack free, allows carboxyl fully be precipitated to steel fiber surface, prepares described modified steel fiber.
2) press formula ratio slag powders, silicon powder, whisker to be mixed, spray into aminopropyl triethoxysilane coupling agent diluent (silane coupler and the mixed liquor of dehydrated alcohol, in diluent, the content of silane coupler is 2.5wt%), grinding, prepare institute State modified superfine powder.
3) pressing formula ratio will be by formula ratio by quartz sand, silica flour, step 1) prepare modified steel fiber, cement, step 2) the modified superfine powder mixing prepared, stirs 3～8 minutes；By formula ratio, additive is mixed with water so that additive is diluted Become aqueous solution, then this aqueous solution is added in said mixture, stir 2～5 minutes, prepare described RPC slurry Body.
4) mould is entered: by step 3) the RPC slurry for preparing puts into mould, and stand 8h and slurry is solidified.
5) just support: by step 4) in the RPC of solidification by the ramp of 12 DEG C/h to 40 ± 5 DEG C, and protect Hold this temperature steam maintenance 24h, then be cooled to room temperature by the speed of 15 DEG C/h.
6) demoulding: RPC and mould thereof are removed steam-curing chamber, the demoulding.
7) support eventually: the RPC after the demoulding is moved in steam-curing chamber, by the ramp of 12 DEG C/h extremely 70 ± 5 DEG C, steam press maintenance 96h, then it is cooled to room temperature by the speed of 15 DEG C/h.
8) by step 7) RPC for preparing moves to indoor, at room temperature natural moisture-keeping maintaining more than 7 days, system Obtain RPC finished product.
Gained RPC test specimen performance is: comprcssive strength 131.4MPa, rupture strength 23.1MPa.
Embodiment 3
A kind of RPC, including the raw material of following weight portion:
Cement 450 parts, modified superfine powder 400 parts, modified steel fiber 165 parts, quartz sand 1160 parts, silica flour 220 parts, outer Add agent 30 parts, 165 parts of water.
The raw material of modified steel fiber and weight ratio are copper plated steel fiber and stainless steel fibre mixture: mercapto propyl triethoxy Silane dilution liquid=10:0.3, steel fibre a diameter of 0.1～0.25mm, a length of 12～15mm；The raw material of modified superfine powder and Weight ratio is slag powders: silicon powder: calcium sulfate crystal whiskers: aminopropyl triethoxysilane coupling agent diluent=15:25:3.5: 0.5.Cement is normal silicate 52.5 class g cement (meeting " GB175-2007 common portland cement ")；Slag powders is S95 level (meeting " GB/T 18046-2008 ground granulated blast furnace slag in cement and concrete ")；Additive is polycarboxylic acids diminishing Agent (water-reducing rate >=30% meets " JG/T 223-2007 polycarboxylate high performance water-reducing agent ").
The preparation method of above-mentioned RPC material comprises the steps:
1) press formula ratio steel fibre, silane coupler to be mixed, specifically, silane coupler dehydrated alcohol is diluted to The concentration of silane coupler is the diluent of 2.5wt%, is uniformly sprayed to the steel fiber surface spread out, dry in the sun 60 minutes, treats Dry tack free, allows carboxyl fully be precipitated to steel fiber surface, prepares described modified steel fiber.
2) press formula ratio slag powders, silicon powder, whisker to be mixed, spray into aminopropyl triethoxysilane coupling agent diluent (aminopropyl triethoxysilane coupling agent diluent is the mixed liquor of aminopropyl triethoxysilane coupling agent and dehydrated alcohol, In diluent, the content of aminopropyl triethoxysilane coupling agent is 2.5wt%), grinding 12min, prepare described modified ultra micro Powder.
3) pressing formula ratio will be by formula ratio by quartz sand, silica flour, cement, step 1) prepare modified steel fiber, step 2) the modified superfine powder mixing prepared, stirs 3～8 minutes, additive suitable quantity of water is diluted to aqueous solution, adds above-mentioned mixing In thing, stir 2～5 minutes, be eventually adding the water of surplus, stir 2～5 minutes, prepare described RPC slurry.
4) mould is entered: by step 3) the RPC slurry for preparing puts into mould, and stand 8h and slurry is solidified.
5) just support: by step 4) in the RPC of solidification by the ramp of 12 DEG C/h to 40 ± 5 DEG C, and protect Hold this temperature steam maintenance 36h, then be cooled to room temperature by the speed of 12 DEG C/h.
6) demoulding: RPC and mould thereof are removed steam-curing chamber, the demoulding.
7) support eventually: the RPC after the demoulding is moved in steam-curing chamber, by the ramp of 12 DEG C/h extremely 70 ± 5 DEG C, steam curing 96h, then it is cooled to room temperature by the speed of 12 DEG C/h.
8) by step 7) RPC for preparing moves to indoor, at room temperature natural moisture-keeping maintaining more than 7 days, system Obtain RPC finished product.
Gained RPC test specimen performance is: comprcssive strength 137.4MPa, rupture strength 23.9MPa.
Embodiment 4
A kind of RPC, including the raw material of following weight portion:
Cement 600 parts, modified superfine powder 270 parts, modified steel fiber 170 parts, quartz sand 1160 parts, silica flour 210 parts, outer Add agent 26 parts, 170 parts of water.
The raw material of modified steel fiber and weight ratio are copper plated steel fiber and stainless steel fibre mixture: mercapto propyl triethoxy Mixed diluting liquid=the 10:0.3 of silane and glycydoxy trimethoxy silane, steel fibre a diameter of 0.1～ 0.25mm, a length of 12～15mm；Raw material and the weight ratio of modified superfine powder are slag powders: silicon powder: calcium sulfate crystal whiskers: metatitanic acid Diluent=the 15:30:4:0.5 of ester coupling agent TMS200.Cement is that normal silicate 42.5 class g cement (meets " GB175- 2007 common portland cements ")；Slag powders is that S95 level (meets " GB/T 18046-2008 grain in cement and concrete Change ground granulated blast furnace slag ")；Additive is that (water-reducing rate >=30% meets " JG/T 223-2007 polycarboxylic-acid height to polycarboxylate water-reducer Performance water reducer ").
The preparation method of above-mentioned RPC material comprises the steps:
1) press formula ratio to mix, steel fibre, silane coupler diluent specifically, by silane coupler dehydrated alcohol It is diluted to the diluent that concentration is 2.5wt% of silane coupler, is uniformly sprayed to the steel fiber surface spread out, dry in the sun 60 points Clock, treats dry tack free, allows carboxyl fully be precipitated to steel fiber surface and forms uniform silane film, prepares described modified steel fiber.
2) press formula ratio slag powders, silicon powder, whisker to be mixed, spray into the diluent (titanium of titanate coupling agent TMS200 The mixed liquor that diluent is titanate coupling agent TMS200 and liquid paraffin of acid esters coupling agent TMS200, titanate esters in diluent The content of coupling agent TMS200 is 50wt%), grinding 12min, prepare described modified superfine powder.
3) pressing formula ratio will be by formula ratio by quartz sand, silica flour, cement, step 1) prepare modified steel fiber, step 2) the modified superfine powder mixing prepared, stirs 3～8 minutes；Additive suitable quantity of water is diluted to aqueous solution, adds above-mentioned mixing In thing, stir 2～5 minutes, be eventually adding the water of surplus, stir 2～5 minutes, prepare described RPC slurry.
4) mould is entered: by step 3) the RPC slurry for preparing puts into mould, and stand 8h and slurry is solidified.
5) just support: by step 4) in the RPC of solidification by the ramp of 12 DEG C/h to 40 ± 5 DEG C, and protect Hold this temperature steam maintenance 36h, then be cooled to room temperature by the speed of 12 DEG C/h.
6) demoulding: RPC and mould thereof are removed fog room, the demoulding.
7) support eventually: the RPC after the demoulding is moved in steam-curing chamber, by the ramp of 12 DEG C/h extremely 70 ± 5 DEG C, steam curing 96h, then it is cooled to room temperature by the speed of 12 DEG C/h.
8) by step 7) RPC for preparing moves to indoor, at room temperature natural moisture-keeping maintaining more than 7 days, system Obtain RPC finished product.
Gained RPC test specimen performance is: comprcssive strength 130.6MPa, rupture strength 26.3MPa.
Embodiment 5
A kind of RPC, including the raw material of following weight portion:
Cement 620 parts, modified superfine powder 250 parts, modified steel fiber 175 parts, quartz sand 1150 parts, silica flour 210 parts, outer Add agent 28 parts, 168 parts of water.
The raw material of modified steel fiber and weight ratio are copper plated steel fiber and stainless steel fibre mixture: mercapto propyl triethoxy Mixed diluting liquid=the 10:0.3 of silane and glycydoxy trimethoxy silane, steel fibre a diameter of 0.1～ 0.25mm, a length of 12～15mm；Raw material and the weight ratio of modified superfine powder are slag powders: silicon powder: calcium sulfate crystal whiskers: metatitanic acid Diluent=the 15:35:4:0.4 of ester coupling agent TMS200.Cement is that normal silicate 42.5 class g cement (meets " GB175- 2007 common portland cements ")；Slag powders is that S95 level (meets " GB/T 18046-2008 grain in cement and concrete Change ground granulated blast furnace slag ")；Additive is that (water-reducing rate >=30% meets " JG/T 223-2007 polycarboxylic-acid height to polycarboxylate water-reducer Performance water reducer ").
The preparation method of above-mentioned RPC material comprises the steps:
1) press formula ratio to mix, steel fibre, silane coupler diluent specifically, by silane coupler dehydrated alcohol Hydrolyze, be diluted to the diluent that concentration is 2.5wt% of silane coupler, be uniformly sprayed to the steel fiber surface spread out, dry in the air Shine 60 minutes, treat dry tack free, allow carboxyl fully be precipitated to steel fiber surface and form uniform silane film, prepare described modified steel fine Dimension.
2) press formula ratio ground slag powder, silicon powder, whisker to be mixed, spray into the diluent of titanate coupling agent TMS200 (diluent of titanate coupling agent TMS200 is the mixed liquor of titanate coupling agent TMS200 and liquid paraffin, titanium in diluent The content of acid esters coupling agent TMS200 is 50wt%), grinding 12min, prepare described modified superfine powder.
3) by formula ratio by quartz sand, silica flour, cement, step 1) prepare modified steel fiber, step 2) prepare change Property superfine powder mixing, stir 3～8 minutes；Additive suitable quantity of water is diluted to aqueous solution, adds in said mixture, stir 2 ～5 minutes, it is eventually adding the water of surplus, stirs 2～5 minutes, prepare described RPC slurry.
4) mould is entered: by step 3) the RPC slurry for preparing puts into mould, and stand 8h and slurry is solidified.
5) just support: by step 4) in the RPC of solidification by the ramp of 12 DEG C/h to 40 ± 5 DEG C, and protect Hold this temperature steam maintenance 36h, then be cooled to room temperature by the speed of 12 DEG C/h.
6) demoulding: RPC and mould thereof are removed steam-curing chamber, the demoulding.
7) steam press maintenance: move in steam-curing chamber by the RPC after the demoulding, by the speed liter of 12 DEG C/h Warm to 70 ± 5 DEG C, steam curing 96h, then it is cooled to room temperature by the speed of 12 DEG C/h.
8) by step 7) RPC for preparing moves to indoor, at room temperature natural moisture-keeping maintaining more than 7 days, system Obtain RPC finished product.
Gained RPC test specimen performance is: comprcssive strength 131.1MPa, rupture strength 27.5MPa.
In sum, the present invention is modified to steel fiber surface by coupling agent, and substantial amounts of carboxyl is deposited on steel fibre table Face, increases the slurry parcel power to steel fibre further, improves the micro interface of steel fibre and slurry.Whisker is utilized to have certain Draw ratio, its intensity are close to the advantage of theoretical lattice intensity, and by coupling agent to ultrafine powder surface modification, increase its dispersion Property and intermolecular IPN.
The present invention according to inorganic crystal whisker non-nuclear density gauge, crystal intensity close to the theoretical value of perfect crystal, mechanical strength etc. In the characteristic of neighbouring interatomic force, by the addition of whisker, improve the correlated performance of RPC, improve comprcssive strength and rupture strength To meet different construction requirements, steel fibre is good with slurry parcel property, and energy to failure is higher, and gain in strength is good, and interface micro-crack subtracts Few.
The principle of above-described embodiment only illustrative present invention and effect thereof, not for limiting the present invention.Any ripe Above-described embodiment all can be modified under the spirit and the scope of the present invention or change by the personage knowing this technology.Cause This, have usually intellectual such as complete with institute under technological thought without departing from disclosed spirit in art All equivalences become are modified or change, and must be contained by the claim of the present invention.

Claims (10)

1. a RPC, it is characterised in that include the raw material of following weight portion: cement 400～1000 parts, modified Superfine powder 100～500 parts, modified steel fiber 50～200 parts, quartz sand 900～1300 parts, silica flour 100～220 parts, additional Agent 10～30 parts, water 100～250 parts.
RPC the most according to claim 1, it is characterised in that: described cement be P.052.5, P.O42.5, One or more combination in P.I52.5, P.I42.5, the particle diameter of described quartz sand is 40-200 mesh, the particle diameter of described silica flour For 400-1000 mesh, described additive is polycarboxylate water-reducer, water-reducing rate >=30%.
RPC the most according to claim 1, it is characterised in that: described modified superfine powder includes following weight The raw material of part: slag powders 0～30 parts, silicon powder 10～30 parts, whisker 1～5 parts, coupling agent diluent 0.2～0.6 part.
RPC the most according to claim 3, it is characterised in that: described slag powders is S95 grade slag powder, institute State the specific surface area >=20m of silicon powder2/kg。
RPC the most according to claim 3, it is characterised in that: described whisker is calcium sulfate crystal whiskers, carbonic acid One or more combination in calcium pyroborate, aluminium borate whisker.
RPC the most according to claim 3, it is characterised in that: described coupling agent diluent is silane coupled Dilution agent liquid or titanate coupling agent diluent, silane coupler diluent is the mixed liquor of silane coupler and dehydrated alcohol, Titanate coupling agent diluent is the mixed liquor of titanate coupling agent and liquid paraffin.
RPC the most according to claim 1, it is characterised in that described modified steel fiber includes following weight The raw material of part: steel fibre 5～10 parts, silane coupler diluent 0.01～0.5 part.
RPC the most according to claim 7, it is characterised in that: silane coupler diluent is silane coupled Agent and the mixed liquor of dehydrated alcohol, described silane coupler is aminopropyl triethoxysilane, glycydoxy three One or more combination in methoxy silane, mercaptopropyltriethoxysilane.
9. the preparation method of a RPC, it is characterised in that comprise the steps:
1) prepare modified steel fiber: by formula ratio, silane coupler is sprayed to steel fiber surface, be dried, prepare described modified steel Fiber, standby；
2) the modified superfine powder of preparation: by formula ratio by slag powders, silicon powder, whisker mixing, grinding, add coupling agent diluent and enter Row surface modification, prepares described modified superfine powder；
3) prepare RPC slurry: by formula ratio by quartz sand, silica flour, step 1) prepare modified steel fiber, Cement, step 2) prepare modified superfine powder mixing, stirring and evenly mixing, standby；Additive is added to the water formation additive water-soluble Liquid, then the aqueous solution of this additive is added in said mixture, prepare described RPC slurry；
4) mould is entered: by step 3) the RPC slurry for preparing puts into mould, and stand and slurry is solidified；
5) just support: by step 4) in solidification RPC put into fog room together with mould, carry out maintenance, after terminating It is cooled to room temperature；
6) demoulding: RPC and mould thereof are removed fog room, the demoulding；
7) support eventually: move to the RPC after the demoulding fog room carries out maintenance, after terminating, be cooled to room temperature；
8) by step 7) RPC for preparing moves to indoor, at room temperature natural moisture-keeping maintaining, prepares reactive powder Concrete finished product.
10. according to the purposes in architectural engineering of the RPC described in any one of claim 1～8.
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CN115710110A (en) * 2022-12-06 2023-02-24 中冶武汉冶金建筑研究院有限公司 Active anchoring type fiber concrete and preparation method thereof

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