CN108929080A - A kind of micro expansion compensation shrinks ultra-high performance concrete and preparation method thereof - Google Patents
A kind of micro expansion compensation shrinks ultra-high performance concrete and preparation method thereof Download PDFInfo
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 72
- 238000002360 preparation method Methods 0.000 title claims abstract description 8
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 72
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 62
- 230000008961 swelling Effects 0.000 claims abstract description 60
- 239000004568 cement Substances 0.000 claims abstract description 58
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 36
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000004567 concrete Substances 0.000 claims abstract description 30
- 239000000835 fiber Substances 0.000 claims abstract description 28
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 26
- 239000002956 ash Substances 0.000 claims abstract description 26
- 239000010881 fly ash Substances 0.000 claims abstract description 26
- 239000010703 silicon Substances 0.000 claims abstract description 26
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 26
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 25
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 24
- 239000010959 steel Substances 0.000 claims abstract description 24
- 239000006004 Quartz sand Substances 0.000 claims abstract description 22
- 239000000463 material Substances 0.000 claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 21
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 20
- 235000013312 flour Nutrition 0.000 claims abstract description 19
- 239000011347 resin Substances 0.000 claims abstract description 12
- 229920005989 resin Polymers 0.000 claims abstract description 12
- 239000002250 absorbent Substances 0.000 claims abstract description 8
- 230000002745 absorbent Effects 0.000 claims abstract description 8
- 239000002994 raw material Substances 0.000 claims abstract description 6
- 238000007906 compression Methods 0.000 claims abstract description 4
- 230000006835 compression Effects 0.000 claims abstract description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical group [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 23
- 239000000292 calcium oxide Substances 0.000 claims description 23
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 23
- 239000000203 mixture Substances 0.000 claims description 12
- 229920006037 cross link polymer Polymers 0.000 claims description 9
- 238000003756 stirring Methods 0.000 claims description 9
- 238000002156 mixing Methods 0.000 claims description 5
- HOOWDPSAHIOHCC-UHFFFAOYSA-N dialuminum tricalcium oxygen(2-) Chemical compound [O--].[O--].[O--].[O--].[O--].[O--].[Al+3].[Al+3].[Ca++].[Ca++].[Ca++] HOOWDPSAHIOHCC-UHFFFAOYSA-N 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000010754 BS 2869 Class F Substances 0.000 claims description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 3
- 239000010949 copper Substances 0.000 claims description 3
- 229910052802 copper Inorganic materials 0.000 claims description 3
- 238000005243 fluidization Methods 0.000 claims description 3
- 238000009472 formulation Methods 0.000 claims description 3
- 239000011398 Portland cement Substances 0.000 claims description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims description 2
- -1 ether compound Chemical class 0.000 claims description 2
- 229920001610 polycaprolactone Polymers 0.000 claims description 2
- 239000004632 polycaprolactone Substances 0.000 claims description 2
- 229920005646 polycarboxylate Polymers 0.000 claims description 2
- RNIHAPSVIGPAFF-UHFFFAOYSA-N Acrylamide-acrylic acid resin Chemical class NC(=O)C=C.OC(=O)C=C RNIHAPSVIGPAFF-UHFFFAOYSA-N 0.000 claims 1
- 239000002518 antifoaming agent Substances 0.000 claims 1
- 238000010304 firing Methods 0.000 claims 1
- 238000005336 cracking Methods 0.000 abstract description 6
- 239000011230 binding agent Substances 0.000 abstract description 3
- 239000004566 building material Substances 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 17
- 230000008602 contraction Effects 0.000 description 11
- 230000000694 effects Effects 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 9
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 description 8
- NIXOWILDQLNWCW-UHFFFAOYSA-N Acrylic acid Chemical class OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 8
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 8
- 239000011575 calcium Substances 0.000 description 8
- 229910052791 calcium Inorganic materials 0.000 description 8
- 239000004615 ingredient Substances 0.000 description 7
- 239000008187 granular material Substances 0.000 description 4
- 235000013339 cereals Nutrition 0.000 description 3
- 239000004574 high-performance concrete Substances 0.000 description 3
- 238000010348 incorporation Methods 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 239000005864 Sulphur Substances 0.000 description 2
- 230000015271 coagulation Effects 0.000 description 2
- 238000005345 coagulation Methods 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000003467 diminishing effect Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 description 1
- 239000004721 Polyphenylene oxide Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001669 calcium Chemical class 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011210 fiber-reinforced concrete Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- FAHBNUUHRFUEAI-UHFFFAOYSA-M hydroxidooxidoaluminium Chemical compound O[Al]=O FAHBNUUHRFUEAI-UHFFFAOYSA-M 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000058 polyacrylate Polymers 0.000 description 1
- 229920000570 polyether Polymers 0.000 description 1
- 229920002959 polymer blend Polymers 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910021487 silica fume Inorganic materials 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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
- 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
-
- 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
- C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]
Landscapes
- 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 belongs to the field of building materials, in particular to a kind of micro expansion compensation shrinks ultra-high performance concrete and preparation method thereof.Raw material of the present invention forms, 1 part of cement, 0.05~0.2 part of flyash, 0.2~0.5 part of silicon ash, 0.1~0.25 part of miberal powder, 0.05~0.2 part of silica flour, 0.9~1.2 part of quartz sand, 0.04~0.2 part of swelling agent, 0.01~0.03 part of water-reducing agent, expansion promote 0.01~0.03 part of reinforcing agent, super absorbent resin volume is the 0.4%~0.8% of cementitious material, the volume volume of steel fibre is the 1%~3% of concrete total volume, water-cement ratio is 0.16~0.22, and compression strength is 100~160MPa.Micro expansion compensation of the present invention, which shrinks ultra-high performance concrete, has the characteristics that microdilatancy, high-strength, high-ductility, excellent working performance, solve the problems, such as that swelling agent is difficult to generate effectively expansion in the ultra-high performance concrete of low water binder ratio, the risk of ultra-high performance concrete early-age shrinkage cracking is reduced, and ultra-high performance concrete can be made to keep microdilatancy for a long time.
Description
Technical field
The invention belongs to building material technical field, in particular to a kind of micro expansion compensation shrink ultra-high performance concrete and
Preparation method.
Background technique
Ultra-high performance concrete (Ultra-High Performance Concrete, abbreviation UHPC) be it is a kind of have than
Normal concrete intensity is higher, toughness is more excellent, the better novel concrete based composites of durability.It solve Structural Engineering to
The requirement that the direction that height is higher, span is bigger, load is heavier is developed, while the requirement of era development has been adapted to, make concrete
Performance has obtained bigger promotion, be over the past thirty years in most creative cement base engineering material.But UHPC also has itself
Defect, due to low water binder ratio and high cement consumption, the UHPC and normal concrete under room temperature maintenance are widely different, i.e. the receipts of UHPC
Contracting is much larger than normal concrete, stirs the potential risk that very high self-constriction deformation in a couple of days after molding is early-age crack,
Self-constriction deform caused by crack reduce its durability to a certain extent, make its engineering construction field application prospect by
To limitation.
Many documents and patent propose that the effective way for solving normal concrete shrinkage cracking is the anhydrous sulphur of incorporation at present
Calcium aluminate type expansion agent and economization agent or anhydrous calcium sulphoaluminate class swelling agent and interior conserving material super absorbent resin are (referred to as
SAP), above method can be efficiently applied to normal concrete, but can not generate ideal expansion effect applied to UHPC
Compensation is shunk.Normal concrete is that water-cement ratio is different from the maximum difference of UHPC, and the two internal water environment in hardening process is poor
It is different larger, UHPC due to ultralow water-cement ratio cause early stage condense hardening process in interior humidity it is obviously less than normal, and harden after due to
UHPC structure is closely knit to cause external curing water to be difficult to penetrate into inside concrete, therefore the main component of swelling agent and SAP, grain
The effect that the selection of diameter and volume expands extreme influence.From the point of view of the UHPC pertinent literature delivered, as 2010 deliver
Influence of combination of expansive and shrinkage-reducing admixture on
autogenous deformation and self-stress of silica fume high-performance
Concrete, this article use anhydrous calcium sulphoaluminate class swelling agent, although the HPC free shrink that can be 0.23 by water-cement ratio
It is reduced to 60u ε, but contraction can not be fully compensated and reach microdilatancy；Such as the Shrinkage and cracking delivered for 2014
of restrained ultra-high-performance fiber-reinforced concrete slabs at early
Age, this article can not be also fully compensated contraction and reached using anhydrous calcium sulphoaluminate class swelling agent although can reduce contraction
To microdilatancy；Such as the The influence of expansive agent on the performance of delivered for 2015
Fiber reinforced cement-based composites, this article uses calcium oxide expansion agents, although can
The UHPC that water-cement ratio is 0.19 is freely dried into contraction and is reduced to 120u ε, but contraction can not equally be fully compensated and reach microdilatancy.
Therefore, it can be seen that being had not been solved yet at present for the shrinkage cracking problem of UHPC.
Summary of the invention
Reach micro- swollen in view of the difference and existing method of UHPC and normal concrete are unable to satisfy UHPC compensation and shrink
Swollen requirement, the present invention proposes while mixing swelling agent, expansion promotes the method for reinforcing agent and SAP, and to swelling agent, SAP
Main component, partial size and the volume of reinforcing agent is promoted to propose specific requirement with expansion.
The first purpose of this invention is to provide a kind of micro expansion compensation and shrinks ultra-high performance concrete, it has micro- swollen
The advantages that swollen lower shrinkage, high-strength, high-ductility, excellent working performance,
Second object of the present invention is to provide for a kind of preparation side of micro expansion compensation contraction ultra-high performance concrete
Method.
The first purpose of this invention can be reached by adopting the following technical scheme that：
A kind of ultra-high performance concrete of microdilatancy, which is characterized in that the ultra-high performance concrete raw material forms by weight
Part is 1 part of cement, 0.05~0.2 part of flyash, 0.2~0.5 part of silicon ash, 0.1~0.25 part of miberal powder, silica flour 0.05~0.2
Part, 0.9~1.2 part of quartz sand, 0.04~0.2 part of swelling agent, 0.01~0.03 part of water-reducing agent, expansion promote reinforcing agent 0.01~
0.03 part, super absorbent resin volume is the 0.4%~0.8% of cementitious material, the volume volume of steel fibre is concrete totality
Long-pending 1%~3% part, water-cement ratio are 0.16~0.22, and compression strength is 100~160MPa.
The cement is 42.5 or 52.5 grades of ordinary portland cements, it is desirable that the reason of tricalcium aluminate content is not more than 8%
For：The shrinking percentage of tricalcium aluminate is high, and the heat of hydration is big, is easy to crack because of the temperature shrinkage of early stage, self-constriction and dry shrink, and
Concrete is set false set and plastic shrinkage occur with the bad adaptability of concrete admixture.
The flyash is level-one Class F fly ash, and particle of the partial size less than 5um accounts for 90% or more, guarantee the sum of concrete
Easy property and intensity.
The silicon ash is spheric granules, and partial size is between 0.1~0.2um.The partial size that the present invention controls silicon ash is due to silicon
Ash is highly active mineral admixture, can form good gradation with cement, flyash, and participate in hydrated cementitious, and can improve UHPC's
Intensity；If silicon ash is not spheric granules, the slump can be less than normal, influences working performance.
The water-reducing agent is polycarboxylate water-reducer, and water-reducing rate is greater than 35%, and air content is less than 2%.
The swelling agent is calcium oxide cement expansive material.It is due to calcium oxide that the present invention, which selects calcium oxide expansion agents,
Swelling agent expansion rate compared with anhydrous calcium sulphoaluminate class swelling agent is big, water requirement is few, and calcium oxide reaction rate and UHPC intensity
Develop rate mutually to coordinate；And anhydrous calcium sulphoaluminate class swelling agent is difficult to generate effective expansion for UHPC, even with SAP or
Expansion promotion reagents recombination, which uses, to be also difficult to generate effective expansion；And the anhydrous sulphur aluminic acid of the effective expansion ratio of calcium oxide expansion agents
Calcium class swelling agent is big, therefore calcium oxide swelling agent is suitble to the UHPC of ultralow water-cement ratio.
The SAP is acrylamide and acrylic acid salt cross-polymer, and partial size is 120~200um, and it is 0.05 that SAP, which adds water-cement ratio,
~0.1.The SAP that the present invention selects is acrylamide and acrylic acid salt cross-polymer, is due to acrylamide and acrylic acid salt cross-polymer
Water absorption rate in cement slurry is higher than polyacrylate, and partial size between 120~200um to working performance and pressure-proof and snap-resistent
Intensity effect is little.And the present invention is combined using acrylamide and acrylic acid salt cross-polymer and calcium oxide expansion agents, is due to list
Solely in the UHPC of ultralow water-cement ratio be added calcium oxide expansion agents easily due to moisture not enough cause calcium oxide reaction it is insufficient,
It not only effectively expands lower but also there are later period stability problem, therefore SAP is added to make its conduct that absorbs water in whipping process
Water tank discharges moisture in concrete coagulation hardening process and expands so that swelling agent is reacted in the best window phase, to reach
The effect for the microdilatancy shunk is compensated, therefore acrylamide and acrylic acid salt cross-polymer SAP and the combination of calcium oxide swelling agent are suitble to surpass
The UHPC of low water binder ratio.
It is amphipathic low molecular weight polycaprolactone ether compound that the expansion, which promotes reinforcing agent, and it is swollen which promotes reinforcing agent that can promote
Swollen, raising intensity and reduction are shunk.Appropriate expansion is added in the case where swelling agent and SAP is added and promotes reinforcing agent by the present invention
Maximum feature is can to delay hydration reaction speed and improve alkaline environment, and then extend the best window phase of swelling agent reaction,
Increase expansion rate and achievees the effect that long-term microdilatancy；The additional water-cement ratio of SAP can be reduced simultaneously, and then improves concrete
The intensity of pore structure raising UHPC；The surface tension of capillary can also be reduced, reduced during concrete coagulation hardening
The contraction generated by capillary dehydration.
The steel fibre is copper facing high-intensity fiber, and volume volume is the 1%~3% of concrete total volume, and tensile strength is big
In 2000MPa.
The 28d expansion rate that the micro expansion compensation shrinks ultra-high performance concrete is that 1143%, 28d compression strength is
100~160MPa, 20~40MPa of flexural strength, divergence are 600~800mm.
Second object of the present invention can be reached by adopting the following technical scheme that：
A kind of micro expansion compensation shrinks the preparation method of ultra-high performance concrete, which is characterized in that includes the following steps：
1) raw material is got out according to formulation ratio；
2) first respectively by the cement of formula ratio, flyash, silicon ash, miberal powder, silica flour, quartz sand, swelling agent, high-hydroscopicity
Resin is added in agitating device and is stirred, and stirs evenly；
3) water, SAP additional water, expansion promotion reinforcing agent and the water-reducing agent for adding formula ratio are stirred fluidisation；
4) after mix Logistics, continuation is slowly added to steel fibre while stirring, and stirs evenly；
5) mixture stirred evenly is poured into mold, is conserved using film covering room temperature, is demoulded after to be hardened
It obtains micro expansion compensation and shrinks ultra-high performance concrete.
Formulation Design Principle of the invention is as follows：
The present invention is to be based on closestpacking principle and fiber reinforcement technology mechanism on the basis of former research, super
In high performance concrete, incorporation swelling agent, SAP and expansion promote reinforcing agent, using the synergistic effect of three, reach ideal micro-
Swelling state compensation is shunk, to avoid early-age shrinkage cracking and shrink larger problem for a long time.
For normal concrete, anhydrous calcium sulphoaluminate class swelling agent and economization agent or anhydrous calcium sulphoaluminate class swelling agent are mixed
Combination with SAP can effectively reduce contraction and be even up to microdilatancy state.But for the UHPC of ultralow water-cement ratio, above method
It is unable to reach microdilatancy state, main cause is still that suitable swelling agent, SAP and expansion is not selected to promote reinforcing agent,
Whether their main component, partial size and volume be for reaching desired expansion state and playing a key effect.
Illustrate advantage of the invention below by way of seven groups of comparative tests.
1. 3 days of blank group UHPC and 28 days shrinkage values are respectively 612u ε and 1346u ε.
2. 3 days and 28 days shrinkage values of 3%~8% calcium oxide swelling agent that volume is cementitious material are added in UHPC
Respectively 346u ε and 956u ε.Only the reaction mechanism of addition swelling agent is in UHPC：Calcium oxide reacts production hydroxide with water
The expanded product of calcium；Although microdilatancy cannot be reached as can be seen that contraction can be reduced by being individually added into calcium oxide swelling agent
State, main cause are that UHPC moisture is less, not can guarantee swelling agent and sufficiently react, and later period unreacted swelling agent has peace
Qualitative problem.
3. 3 days and the 28 days shrinkage value difference of 0.4%~0.8% SAP that volume is cementitious material are added in UHPC
It should be the acrylamide and acrylic acid that partial size is 120~200um, additional water-cement ratio is 0.05~0.1 for 235u ε and 567u ε, SAP
Salt cross-polymer.Reaction mechanism is：SAP condenses hardening process in UHPC by absorbing moisture in whipping process as water tank
In cause SAP to discharge moisture due to humidity reduction, and then constantly provide interior curing water, reduce shrinkage value.As can be seen that being added
Shrinkage value can be greatly reduced in SAP, but is unable to reach microdilatancy state, and SAP has certain unfavorable shadow to mechanical property
It rings.
Promote shrink within 3 days and 28 days of reinforcing agent 4. 1%~3% expansion that volume is cement is added simultaneously in UHPC
Value is respectively 345 ε and 1213u ε, is also unable to reach the state of microdilatancy.
5. it is gelling that 3%~8% calcium oxide swelling agent that volume is cementitious material and volume is added simultaneously in UHPC
3 days and 28 days shrinkage values respectively -224u ε and -337u ε of 0.4%~0.8% SAP of material, it is 120 that SAP, which should be partial size,
The acrylamide and acrylic acid salt cross-polymer that~200um, additional water-cement ratio are 0.05~0.1.Calcium oxide is added simultaneously in UHPC
The reaction mechanism of swelling agent and SAP is：SAP is condensed in UHPC and is hardened by absorbing moisture in whipping process as water tank
SAP discharges moisture so that swelling agent sufficiently reacts generation expanded product in the best window phase in the process, shrinks to reach compensation
Microdilatancy effect.As can be seen that calcium oxide swelling agent and SAP are added simultaneously can generate effectively expansion and reach microdilatancy shape
State, it is contemplated that contraction can be continued for development and SAP can reduce the mechanical property of UHPC to a certain extent, therefore still need
It is bigger and maintain the impregnable method of mechanical property to find a swell increment.
6. it is cement that 3%~8% calcium oxide swelling agent that volume is cementitious material and volume is added simultaneously in UHPC
1%~3% expansion promote 3 days of reinforcing agent and 28 days shrinkage values are respectively 42 ε and 369u ε.With only be added swelling agent or
Person is only added expansion and reinforcing agent is promoted to compare, and the combination of swelling agent and expansion promotion reinforcing agent, which is still able to reduce, shrinks；Here
Expansion promote reinforcing agent can play the role of extend swelling agent reaction the best window phase, but and not up to desired expansion effect
Fruit, main cause or swelling agent do not obtain enough water reactions.
7. it is gelling material that 3%~8% calcium oxide swelling agent, volume that volume is cementitious material is added simultaneously in UHPC
0.4%~0.8% SAP and volume of material are that the 1%~3% of cement expansion promotes 3 days and 28 days shrinkage values of reinforcing agent
Respectively -865u ε and -1124u ε.Calcium oxide swelling agent, SAP is added simultaneously in UHPC and enters expansion and promotes the anti-of reinforcing agent
The mechanism is answered to be：SAP in whipping process by absorbing moisture as water tank, and SAP discharges water in UHPC condensation hardening process
Divide so that swelling agent sufficiently reacts, the best window phase that expansion promotes reinforcing agent that can extend swelling agent reaction has further increased
Effect expansion, expansion promote reinforcing agent also to can reduce the additional water-cement ratio of SAP and then improve the pore structure of UHPC and improve strong
Degree, the surface tension that expansion promotes reinforcing agent that can also reduce pore reduce contraction.As can be seen that it is swollen that calcium oxide is added simultaneously
Swollen dose of SAP and expansion promotion reinforcing agent can generate effectively expansion and reach ideal microdilatancy state, can not only remain long-term
The effect of microdilatancy can also further increase the mechanical property of UHPC.
Beneficial effects of the present invention are：
Micro expansion compensation of the present invention shrinks ultra-high performance concrete and promotes reinforcing agent by incorporation swelling agent, SAP and expansion,
Reach ideal microdilatancy state using three's synergistic effect, avoids the cracking risk as caused by shrinking；By mixing mine
Polymer blends material reduces water-cement ratio raising intensity using high efficiency water reducing agent；Its toughness is improved by mixing a large amount of steel fibres；In addition lead to
The grain composition for crossing control silica flour, quartz sand and admixture guarantees the mobile performance of mixture.It is of the invention micro- swollen on the whole
Ultra-high performance concrete is shunk in swollen compensation has the characteristics that microdilatancy lower shrinkage, high-strength, high-ductility, excellent working performance.
The 28d expansion rate that micro expansion compensation of the present invention shrinks ultra-high performance concrete is 1143u ε, 28d pressure resistance
Degree is 100~160MPa, and 20~40MPa of flexural strength, divergence is 600~800mm.
Specific embodiment
In the following, being described further in conjunction with specific embodiment to the present invention：
Embodiment 1：
A kind of micro expansion compensation shrinks the preparation method of ultra-high performance concrete, includes the following steps：
1) raw material is got out according to following seven different ratios respectively：
A0 is blank group, ingredient be cement, flyash, silicon ash, miberal powder, silica flour, quartz sand, water-reducing agent, steel fibre and
Water；1 part of cement, 0.05~0.2 part of flyash, 0.2~0.5 part of silicon ash, 0.1~0.25 part of miberal powder, silica flour 0.05~0.2
Part, 0.9~1.2 part of quartz sand, 0.01~0.03 part of water-reducing agent, steel fibre volume volume be concrete total volume 1%~
3% part, water-cement ratio is 0.16~0.22.
A1 group is only plus swelling agent, ingredient are cement, flyash, silicon ash, miberal powder, silica flour, quartz sand, swelling agent, diminishing
Agent, steel fibre and water；1 part of cement, 0.05~0.2 part of flyash, 0.2~0.5 part of silicon ash, 0.1~0.25 part of miberal powder, silica flour
0.05~0.2 part, 0.9~1.2 part of quartz sand, 0.04~0.2 part of swelling agent, 0.01~0.03 part of water-reducing agent, steel fibre body
Product volume is 1%~3% part of concrete total volume, and water-cement ratio is 0.16~0.22.
A2 group is only plus SAP, ingredient are cement, flyash, silicon ash, miberal powder, silica flour, quartz sand, water-reducing agent, high-hydroscopicity
Resin, steel fibre and water；1 part of cement, 0.05~0.2 part of flyash, 0.2~0.5 part of silicon ash, 0.1~0.25 part of miberal powder, quartz
0.05~0.2 part of powder, 0.9~1.2 part of quartz sand, 0.01~0.03 part of water-reducing agent, super absorbent resin volume are cementitious material
0.4%~0.8%, 1%~3% part that the volume volume of steel fibre is concrete total volume, water-cement ratio is 0.16~0.22.
A3 group is only plus expansion promotes reinforcing agent, and ingredient is cement, flyash, silicon ash, miberal powder, silica flour, quartz sand, diminishing
Agent, expansion promote reinforcing agent, steel fibre and water；1 part of cement, 0.05~0.2 part of flyash, 0.2~0.5 part of silicon ash, miberal powder 0.1
~0.25 part, 0.05~0.2 part of silica flour, 0.9~1.2 part of quartz sand, 0.01~0.03 part of water-reducing agent, expansion promotion reinforcing agent
0.01~0.03 part, the volume volume of steel fibre is 1%~3% part of concrete total volume, and water-cement ratio is 0.16~0.22.
Swelling agent and SAP is added in A4 simultaneously, and ingredient is cement, flyash, silicon ash, miberal powder, silica flour, quartz sand, expansion
Agent, water-reducing agent, super absorbent resin, steel fibre and water；1 part of cement, 0.05~0.2 part of flyash, 0.2~0.5 part of silicon ash, mine
0.1~0.25 part of powder, 0.05~0.2 part of silica flour, 0.9~1.2 part of quartz sand, 0.04~0.2 part of swelling agent, water-reducing agent 0.01
~0.03 part, super absorbent resin volume be the 0.4%~0.8% of cementitious material, the volume volume of steel fibre is that concrete is total
1%~3% part of volume, water-cement ratio are 0.16~0.22.
A5 be added simultaneously swelling agent and expansion promote reinforcing agent, ingredient be cement, flyash, silicon ash, miberal powder, silica flour,
Quartz sand, swelling agent, water-reducing agent, expansion promote reinforcing agent, steel fibre and water；1 part of cement, 0.05~0.2 part of flyash, silicon ash
0.2~0.5 part, 0.1~0.25 part of miberal powder, 0.05~0.2 part of silica flour, 0.9~1.2 part of quartz sand, swelling agent 0.04~0.2
Part, 0.01~0.03 part of water-reducing agent, expansion promote 0.01~0.03 part of reinforcing agent, and the volume volume of steel fibre is that concrete is overall
Long-pending 1%~3% part, water-cement ratio are 0.16~0.22.
Swelling agent, SAP and expansion are added simultaneously and promotes reinforcing agent for A6 group, and ingredient is cement, flyash, silicon ash, miberal powder, stone
Ying Fen, quartz sand, swelling agent, water-reducing agent, expansion promote reinforcing agent, super absorbent resin, steel fibre and water；1 part of cement, fine coal
Grey 0.05~0.2 part, 0.2~0.5 part of silicon ash, 0.1~0.25 part of miberal powder, 0.05~0.2 part of silica flour, quartz sand 0.9~1.2
Part, 0.04~0.2 part of swelling agent, 0.01~0.03 part of water-reducing agent, expansion promote 0.01~0.03 part of reinforcing agent, high-hydroscopicity tree
Rouge volume is the 0.4%~0.8% of cementitious material, the volume volume of steel fibre is concrete total volume 1%~3% part, water
Glue ratio is 0.16~0.22.
2) first respectively by the cement of formula ratio, flyash, silicon ash, miberal powder, silica flour, quartz sand, swelling agent, high-hydroscopicity
Resin is added in agitating device and is stirred；
3) water, SAP additional water, water-reducing agent and the expansion for after mixing evenly, adding formula ratio promote reinforcing agent to be stirred
Mix fluidisation；
4) after mix Logistics, continuation is slowly added to steel fibre while stirring, and stirs evenly；
5) mixture stirred evenly is poured into mold, is conserved using film covering room temperature, is demoulded after to be hardened
It obtains micro expansion compensation and shrinks ultra-high performance concrete.
6) in the present embodiment, swelling agent is calcium oxide expansion agents；It is amphipathic low molecular polyether that expansion, which promotes reinforcing agent,
Compound；SAP be acrylamide and acrylic acid salt cross-polymer, partial size be 120~200um, SAP add water-cement ratio be 0.05~
0.1；The tricalcium aluminate content of cement is not more than 8%；Silicon ash is spheric granules, and partial size is between 0.1~0.2um；Flyash
For level-one Class F fly ash, particle of the partial size less than 5um accounts for 90% or more；The SiO of silica flour2Content is greater than 95%, average grain
Diameter is the spheric granules of 45um；The SiO of quartz sand2Content is greater than 95%, and partial size is between 0.4~1.1mm；Steel fibre is copper facing
High-intensity fiber, volume volume are the 1%~3% of concrete total volume, and tensile strength is greater than 2000MPa；Water-reducing agent is polycarboxylic acids
Water-reducing agent, water-reducing rate are greater than 35%, and air content is less than 2%.
7) each implementation group material property summarized results such as the following table 1
Claims (10)
1. a kind of ultra-high performance concrete of microdilatancy, which is characterized in that the ultra-high performance concrete raw material forms by weight
For 1 part of cement, 0.05~0.2 part of flyash, 0.2~0.5 part of silicon ash, 0.1~0.25 part of miberal powder, silica flour 0.05~0.2
Part, 0.9~1.2 part of quartz sand, 0.04~0.2 part of swelling agent, 0.01~0.03 part of water-reducing agent, expansion promote reinforcing agent 0.01~
0.03 part, super absorbent resin volume is the 0.4%~0.8% of cementitious material, the volume volume of steel fibre is concrete totality
Long-pending 1%~3% part, water-cement ratio are 0.16~0.22, and compression strength is 100~160MPa.
2. micro expansion compensation according to claim 1 shrinks ultra-high performance concrete, which is characterized in that the cement is
42.5 or 52.5 grades of ordinary portland cements, tricalcium aluminate content are not more than 8%.
3. micro expansion compensation according to claim 1 shrinks ultra-high performance concrete, which is characterized in that the flyash is
Level-one Class F fly ash, particle of the partial size less than 5um account for 90% or more.
4. micro expansion compensation according to claim 1 shrinks ultra-high performance concrete, which is characterized in that the silicon ash is ball
Shape particle, partial size is between 0.1~0.2um.
5. micro expansion compensation according to claim 1 shrinks ultra-high performance concrete, which is characterized in that the swelling agent is
Calcium oxide cement expansive material, firing temperature are 1200 DEG C~1300 DEG C, and volume is the 3%~8% of cementitious material.
6. micro expansion compensation according to claim 1 shrinks ultra-high performance concrete, which is characterized in that the water-reducing agent is
Polycarboxylate water-reducer, water-reducing rate are greater than 35%, and air content is less than 2%.
7. micro expansion compensation according to claim 1 shrinks ultra-high performance concrete, which is characterized in that the SAP is third
Acrylamide-acrylates cross-polymer, partial size are 120~200um, and adding water-cement ratio is 0.05~0.1, and volume is cementitious material
0.4%~0.8%.
8. micro expansion compensation according to claim 1 shrinks ultra-high performance concrete, which is characterized in that the expansion promotes
Reinforcing agent is a kind of amphipathic low molecular weight polycaprolactone ether compound, and volume is the 1%~3% of cement mixing content.
9. micro expansion compensation according to claim 1 shrinks ultra-high performance concrete, which is characterized in that the steel fibre is
Copper facing high-intensity fiber, volume volume are the 1%~3% of concrete total volume, and tensile strength is greater than 2000MPa.
10. micro expansion compensation according to claim 1 shrinks the preparation method of ultra-high performance concrete, which is characterized in that
Include the following steps：
1) raw material is got out according to formulation ratio；
2) first respectively by the cement of formula ratio, flyash, silicon ash, miberal powder, silica flour, quartz sand, swelling agent, defoaming agent, high suction
Water-base resin is added in agitating device and is stirred, and stirs evenly；
3) water, SAP additional water, expansion promotion reinforcing agent and the water-reducing agent for adding formula ratio are stirred fluidisation；
4) after mix Logistics, continuation is slowly added to steel fibre while stirring, and stirs evenly；
5) mixture stirred evenly is poured into mold, is conserved using film covering room temperature, demoulding after to be hardened can be obtained
Micro expansion compensation shrinks ultra-high performance concrete.
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