CN107265966B - It is a kind of to prepare bridge self-compaction cracking resistance clear-water concrete using high fine powder content Machine-made Sand - Google Patents
It is a kind of to prepare bridge self-compaction cracking resistance clear-water concrete using high fine powder content Machine-made Sand Download PDFInfo
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- CN107265966B CN107265966B CN201710326386.9A CN201710326386A CN107265966B CN 107265966 B CN107265966 B CN 107265966B CN 201710326386 A CN201710326386 A CN 201710326386A CN 107265966 B CN107265966 B CN 107265966B
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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
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
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Abstract
The invention discloses a kind of to prepare bridge self-compaction cracking resistance clear-water concrete using high fine powder content Machine-made Sand, it by cement, active fly ash microballon, silicon ash, swelling agent, Machine-made Sand, rubble, it is light porous gather materials, high performance additive and water are prepared.The present invention substitutes common natural river sand using high fine powder content Machine-made Sand, and utilize the viscosity and fluidity of active fly ash microballon and silicon ash adjustment concrete, improve the homogeneity of concrete mortar, and concrete 's air-containing is reduced further combined with additive, improve the working performance and mobility retention property of concrete；Meanwhile present invention combination swelling agent and the light porous volume stability that can effectively improve clear-water concrete and the anti-early-age crack performance of gathering materials.For gained self-compaction cracking resistance clear-water concrete of the invention to different fine powder content Machine-made Sand wide adaptabilities, working performance, mechanical property, volume stability and cracking resistance are excellent, and appearance luster is uniform, have preferable mirror effect.
Description
Technical field
The invention belongs to the field of building materials, and in particular to a kind of to prepare bridge self-compaction using high fine powder content Machine-made Sand
Cracking resistance clear-water concrete and preparation method thereof.
Background technique
With the development of society, Urban Bridge Construction will not only meet the requirement of military service performance and used life, Er Qiexu
Meet feature that is beautiful, being adapted with environment, thus using High-performance clean water concrete be modern bridge construction development must
Right trend.In general, natural river sand need to be used by preparing bridge High-performance clean water concrete, however, national supply side reform in recent years
Implementation, it is higher and higher to the resource-effective and environmental requirement of building material industry, for protect riverbed, many local governments are all to natural
River sand resource takes limit and adopts measure, and natural river sand resource is more nervous.
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.Meanwhile box beam and T beam
Bottom present position reinforcing bar density is big, and reinforcing bar close quarters concrete is difficult to vibrate sufficiently, therefore, to bridge fair-faced concrete
Working performance is more demanding, and the constraint after concrete hardening by internal intensive reinforcing bar is easily drawn once concrete shrinkage is excessive
Hair cracking, aggravates external erosion, and Corrosion Reinforcement reduces the service life of bridge.
Therefore, preparing bridge self-compaction cracking resistance clear-water concrete using high fine powder content Machine-made Sand is to develop bridge clear water to mix
Solidifying soil there is an urgent need to have wide researching value and social benefit.
Summary of the invention
The object of the present invention is to provide a kind of bridge self-compaction cracking resistance clear water using the preparation of high fine powder content Machine-made Sand is mixed
Solidifying soil, working performance, mechanical property, volume stability and cracking resistance are excellent, and appearance luster is uniform, it is preferable brilliant to have
Face effect；And to the Machine-made Sand wide adaptability of different fine powders (including mountain flour and mud powder) content, there is important practical application valence
Value.
To achieve the above object, the technical solution adopted by the present invention is that:
It is a kind of using high fine powder content Machine-made Sand prepare bridge self-compaction cracking resistance clear-water concrete, it mainly by cement,
Fly ash micro-sphere, silicon ash, swelling agent, Machine-made Sand, rubble, it is light porous gather materials, additive and water are prepared as a raw material, each group
Point and its volume are as follows: 280~380kg/m of cement3, 30~80kg/m of fly ash micro-sphere3, 20~40kg/m of silicon ash3, swelling agent 20
~35kg/m3, 700~750kg/m of Machine-made Sand3, 900~1100kg/m of rubble3, the light porous 50~100kg/m that gathers materials3, additional
3.5~7kg/m of agent3, 120~160kg/m of water3。
According to above scheme, the cement is 52.5 portland cement of PO 42.5 or PO.
According to above scheme, specific surface area >=1300m of the fly ash micro-sphere2/ kg, activity index >=101% need water
Ratio≤95% is measured, crystal structure is amorphous state.
According to above scheme, activity index >=105%, SiO of the silicon ash2Mass content >=90%, loss on ignition≤
5%, specific surface area is >=16000m2/kg。
According to above scheme, the expansion sources of the swelling agent are MgO (such as MgO) or calcium sulphoaluminate-calcium oxide (such as HCSA
Cement expansive material etc.), chlorine ions content < 0.05%, 7d limited expansion rate > 0.03 in water, 21d limitation in air
Expansion rate >=-0.01.
According to above scheme, the fineness modulus of the Machine-made Sand is 2.3~3.0, fine powder (mountain flour and mud powder) in Machine-made Sand
Mass content is 8~20%, crush values≤7%, methylene blue number < 1.5.
Preferably, the mass content of fine powder is 10~18% in the Machine-made Sand.
In above scheme, the high fine powder content Machine-made Sand refers to fine powder partial size≤0.75 μm of Machine-made Sand, and fine powder contains
Amount is 8~20%；Its fine powder content is higher than national respective standard to mountain flour and mud in different strength concrete Machine-made Sand
The required value of powder mass content, national standard JTG TF50-2011 " highway bridge and culvert construction technique normalizing " regulation are less than C30, C30
Fine powder mass content is no more than 10%, 7% and 5% in~C60, the concrete Machine-made Sand greater than C60.
According to above scheme: the rubble is limestone gravel or basaltic broken stone, 5~20 continuous gradings, gill shape
Mass content≤8% of grain, crush values≤10%.
According to above scheme: it is described it is light porous gather materials for 900 grades of breaking type haydites of book structure, bulk density is 860~
900kg/m3, cylindrical compress strength is greater than 6.5MPa, water absorption rate > 8%.
According to above scheme, the preparation method of the additive is the following steps are included: 1) by acrylic acid and methacrylic
Polyethylene glycol is with (3.5~4.5): 1 molar ratio be heated under the action of catalyst I 60~90 DEG C of progress copolyreaction 5~
8h, wherein catalyst I is the p-methyl benzenesulfonic acid solution that mass concentration is 1~2%, and the additive amount of catalyst I is acrylic acid quality
5~10%, obtain polycarboxylate water-reducer molecule main chain；By ethylene oxide and propylene oxide with (1~3): 1 molar ratio is 100
At~150 DEG C, using potassium hydroxide as basic catalyst II, potassium hydroxide volume be reaction system gross mass 0.2%~
1%, random copolymerization is carried out, copolymer is controlled in 80~90 polymerization scopes, obtains polycarboxylate water-reducer molecule side chain monomer；
By polycarboxylate water-reducer molecule main chain with polycarboxylate water-reducer molecule side chain monomer with 1:(7~12) molar ratio be uniformly mixed,
Graft copolymerization, the addition of ammonium persulfate solution are carried out in the case where mass concentration is the initiation conditions of 30~50% ammonium persulfate solution
Amount is 3~6% by polycarboxylate water-reducer molecule main chain and polycarboxylate water-reducer molecule side chain monomer gross mass, grafting density control
9~9.5%, the molecular weight of graft copolymerization product controls between 35000~55000 system, obtains diminishing and protects modeling component A；2) will
It is double bond containing acid with poly glycol monomethyl ether in molar ratio (1~3): 1 at a temperature of 80~100 DEG C carry out 2~4h of condensation reaction,
The polymeric monomer c with diminishing function is made；Then maleic acid anhydride monomer and diethylene glycol dipropylene glycol class monobutyl ether are pressed (2
~3): 1 molar ratio reacts the monomer d that 4~6h preparation has reducing function at 100~130 DEG C；Then by gained polymeric monomer
C and monomer d and Sodium methacrylate press (5~7): (1~1.5): 1 molar ratio is drawn under the action of initiator potassium persulfate
The additive amount for sending out agent is the 2~4% of Sodium methacrylate quality, and 3~5h of copolyreaction, system are carried out under conditions of 50~80 DEG C
It obtains diminishing and reduces component B；3) diminishing is protected modeling component A to mix with diminishing decrement component B in mass ratio 2/3~3/2, then
Organic silicon defoamer and air entraining agent is added, is uniformly mixed up to the additive, wherein organic silicon defoamer and air entraining agent add
Dosage is respectively 0.03~0.06% and 0.002~0.005% that water protects modeling component A and diminishing decrement component B gross mass.
In above scheme, the additive amount of the organic silicon defoamer and air entraining agent is respectively to protect modeling component A and diminishing decrement
The 0.03~0.06% and 0.002~0.005% of component B gross mass.
In above scheme, the double bond containing acid is methacrylic acid or acrylic acid.
In above scheme, the air entraining agent is dodecyl ether sulfate class air entraining agent.
In above scheme, the diethylene glycol dipropylene glycol class monobutyl ether is diethylene glycol monobutyl ether or dipropylene glycol mono butyl
Ether etc..
According to above scheme, the water is ordinary tap water.
A kind of preparation method of above-mentioned bridge self-compaction cracking resistance clear-water concrete, it includes the following steps: 1) to claim according to the ratio
Take each raw material: 280~380kg/m of cement3, 30~80kg/m of active fly ash microballon3, 20~40kg/m of silicon ash3, swelling agent 20
~35kg/m3, 700~750kg/m of Machine-made Sand3, 900~1100kg/m of rubble3, the light porous 50~100kg/m that gathers materials3, additional
3.5~7kg/m of agent3, 120~160kg/m of water3；2) by it is light porous gather materials carry out full water process, using it is preceding again will be light porous
Gather materials and dries in the air to saturated dry surface, it is spare；3) Machine-made Sand, rubble, light porous preparatory dry mixing according to the ratio of gathering materials are uniformly mixed,
Then will be added weighed cement, fly ash micro-sphere, silicon ash, swelling agent continue dry mixing be uniformly mixed, 4) additive and water are mixed
Close, be poured slowly into agitated kettle, and start simultaneously at stirring, the duration is 2~3min, the concrete mixed, 5) it will
The concreting mixed enters mould to get high fine powder content Machine-made Sand bridge self-compaction cracking resistance clear-water concrete.
The principle that the present invention uses are as follows:
(1) present invention replaces river sand to prepare clear-water concrete using the Machine-made Sand of high fine powder content, when thin in Machine-made Sand
When 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 homogeneity
Easily there is the problem of taking off bottom and bleeding in difference, concrete, and the present invention utilizes activity powder by incorporation active fly ash microballon and silicon ash
" ball effect " of the fly ash micro-bead in concrete can significantly reduce cement slurry shear stress, reduce concrete plastic viscosity, tool
There is the characteristic of mineral diminishing；And its ultra-fine partial size, concrete density can be improved, improve cement slurry and coarse aggregate in concrete
Between interface, reduce harmful pore, improve concrete strength and corrosion resistance；Silicon ash has improvement cohesiveness, water conservation
Effect avoids the isolation excreting water phenomenon of the clear-water concrete of high fine powder content Machine-made Sand preparation；Active fly ash microballon and silicon ash
The compound interfacial transition zone that can be also effectively improved inside concrete gelling slurry, generates the lower C-S-H gel of Ca/Si, improves
The ability for resisting external erosion, to improve the durability of clear-water concrete, and improves the mobility of Machine-made Sand clear-water concrete
And cohesiveness, the unification of clear-water concrete high fluidity and high cohesion is realized, effectively inhibits the floating of mineral admixture, mentions
The high homogeneity of concrete, makes to pour rear appearance color using the bridge fair-faced concrete engineering of high fine powder content Machine-made Sand preparation
Pool is uniform.
(2) reinforcing bar is intensive at the beam bottom of bridge, and concrete is difficult to vibrate, and high fine powder content machine-made sand concrete shrink compared with
Greatly, easy to crack.It is therefore desirable to bridge fair-faced concrete working performance with higher and volume stability, it is contemplated that clear water
The finishing effect of concrete, additive also need have low air-entraining performance；Additive collection low gas content amount that the present invention researches and develops, high water reduction are protected
For the functions such as modeling and decrement performance in one, the additive for avoiding different simple functions is existing mutual in practical engineering applications
It is not suitable with, reduces the problems such as using effect.Additive of the present invention can be improved the degree of scatter of cement granules, improve cement
Cementing properties: with the progress of hydrated reaction of cement, polyether lateral chain is gradually hydrolyzed from main chain in cement strong basicity environment
Reaction, improves the mobility holding capacity of concrete；Meanwhile by with reducing function alkyl, polyether, provide steric hindrance effect
The polyethers answered and the amide group with ultra-dispersed cement granules effect are grafted in copolymer chain, can reduce concrete
It shrinks；Mix certain defoaming agent and air entraining agent again again, the air pocket for clear-water concrete appearance of eliminating the effects of the act introduces numerous tiny
Even minute bubbles realize the self-compacting ability of high fine powder content Machine-made Sand clear-water concrete.
(3) concrete shrinkage prepared using high fine powder content Machine-made Sand is big, and early stage is easy to crack, by internal steel after hardening
The constraint of muscle is also easy to produce biggish shrinkage stress during contraction distortion, when shrinkage stress is greater than the tensile strength of concrete
When, the cracking of concrete structures will be caused, aggravates external erosion and internal steel bar corrosion, reduces the service life of bridge.
The swelling agent that the present invention mixes can generate dilatancy product in inside concrete aquation, be filled in inside concrete gelling slurry
Pore and defect improve volume stability of concrete energy；The full water mixed simultaneously prewets haydites of book structure can be in concrete strength
Water is slowly released in development process, dry contraction and self-constriction, reduce coagulation caused by reducing due to the decline of inside concrete humidity
Native early-age crack sensibility；Additive of the invention also has reducing function, can significantly reduce hair inside concrete gelling slurry
Pore tension and effectively inhibit concrete shrinkage；Said effect synergistic effect, can effectively improve the cracking resistance of gained concrete.
Compared with prior art, the invention has the benefit that
(1) present invention prepares self-compaction cracking resistance clear-water concrete, 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 bleeding existing for clear-water concrete, takes off bottom phenomenon, improves the cohesiveness of slurry, it is suppressed that density is lighter
Particle floating, improve the homogeneity of concrete mortar, the color difference after avoiding fair-faced concrete molding improves clear water
The mirror effect of concrete.
(2) high performance additive that the present invention develops is remarkably improved the working performance of concrete and mobility keeps energy
Power, the gel particles of inside concrete are evenly dispersed, cement consumption and folk prescription concrete water amount are reduced, concrete is improved
Compactness and intensity；Alkyl, polyether decrement group on water-reducing agent can reduce the surface tension of hole solution in concrete mortar, subtract
The contraction of few concrete makes the clear-water concrete of preparation have self-compacting ability, improves clear-water concrete engineering construction speed
And construction quality.
(3) clear-water concrete technology of preparing of the invention will compensate contraction principle and apply jointly with maintenance technology in concrete
In preparing high fine powder content Machine-made Sand bridge self-compaction cracking resistance clear-water concrete, the present invention is being mentioned using silicon ash with fly ash micro-sphere
The cohesiveness of high concrete on the basis of avoiding light-weight aggregate On The Floating, is prepared further directed to high fine powder content Machine-made Sand
Concrete shrinkage it is big, early stage it is easy to crack the problems such as, using swelling agent compensating concrete shrink, refine pore structure；And it is preferably high
Strong porous light gathers materials and can slowly release water in concrete early strength development process, reduces since inside concrete humidity declines
It is caused it is dry shrink and self-constriction, reduce concrete bracing sensibility, realize bridge High-performance clean water concrete from
The anti-cracking performance in early stage to full stage in later period is promoted.
(4) present invention prepares bridge self-compaction cracking resistance clear-water concrete, the coagulation of preparation using high fine powder content Machine-made Sand
Native air content≤2.0%, the equal < 15mm of loss of the slump and divergence after slump > 240mm, divergence > 600mm, 2h,
Shrinking percentage≤2 × 10 90d-4, cracking resistance grade is V grade.With excellent self-compaction cracking resistance, meet clear-water concrete appearance
The requirement of quality.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention more comprehensible, with reference to embodiments, to the present invention into
Row is further described.It should be appreciated that described herein, specific examples are only used to explain the present invention, is not used to limit
The present invention.
For a better understanding of the present invention, below with reference to the embodiment content that the present invention is furture elucidated, but the present invention is not
It is limited only to the following examples.It should be appreciated that described herein, specific examples are only used to explain the present invention, and does not have to
It is of the invention in limiting.
In following instance, cement uses high 42.5 ordinary portland cement of Sheng PO；Silicon ash, which is purchased from the bright icepro science and technology in Chengdu, to be had
Limit company, activity index 105%, SiO2Mass content is 92%, loss on ignition 4.5%, specific surface area 17000m2/
kg；Fly ash micro-sphere builds up new material Science and Technology Ltd. by Tianjin and provides, specific surface area 1470m2/ kg, activity index are
103%, water demand ratio 92%, amorphous state；Swelling agent buys the HCSA cement expansive material produced from Tianjin Bao Ming company,
Expansion sources are calcium sulphoaluminate-calcium oxide, and chlorine ions content is 0.03%, and 7d limited expansion rate is 0.051 in water, air
Middle 21d limited expansion rate is 0.01；Mechanism grain fineness number modulus is 2.74, crush values 6.7%, and fine powder mass content is
14.3%, methylene blue number 1.4；Rubble is the basaltic broken stone of 5~20mm continuous grading, and flat-elongated particles mass content is
7%, crush values 6%；Light porous to gather materials for high-strength 900 grades of breaking type haydites of book structure of high water absorption multiplying power, bulk density is
880kg/m3, cylindrical compress strength 7.1MPa, water absorption rate 9.1%；Water is ordinary tap water.
Examples 1 to 2
It is a kind of to prepare bridge self-compaction cracking resistance clear-water concrete (C30~C40) using high fine powder content Machine-made Sand, it prepares
Method includes the following steps:
1) each raw material is weighed by proportion described in table 1-1；In advance by it is light porous gather materials carry out full water process, use and preceding again will
Through satisfy water process after it is light porous gather materials dry in the air to saturated dry surface, it is spare；
2) by weighed Machine-made Sand, rubble and it is light porous gather materials pour into agitated kettle according to the ratio dry mixing 1min mix it is equal
It is even, cement, fly ash micro-sphere, silicon ash, swelling agent be then added continue dry-mixed 1.5min and be uniformly mixed, and then by additive with
Water mixing, is poured slowly into agitated kettle, and start simultaneously at stirring, duration 3min obtains uniform mixture, finally pours
Enter mould, the bridge self-compaction cracking resistance clear-water concrete that standard curing is prepared after 1d demoulding to get the high fine powder content Machine-made Sand.
The preparation of additive described in Examples 1 to 2 the following steps are included: 1) under the conditions of catalyst I, by acrylic acid and
Methacrylic polyethylene glycol carries out copolyreaction 6h by the molar ratio of 4:1 at a temperature of 70 DEG C, and wherein catalyst I is quality point
The p-methyl benzenesulfonic acid solution of number 1%, the additive amount of catalyst I are the 6% of acrylic acid quality, obtain polycarboxylate water-reducer molecule master
Chain, by ethylene oxide, 1:1 is at 130 DEG C in molar ratio with propylene oxide, using potassium hydroxide as basic catalyst II, hydroxide
Potassium volume is the 0.5% of reaction system (ethylene oxide and propylene oxide) gross mass, carries out random copolymerization, controls copolymer 85
~90 polymerization scopes, obtain polycarboxylate water-reducer molecule side chain monomer, by gained polycarboxylate water-reducer molecule main chain and gather
Carboxylic acid water reducer molecular side chain monomer is uniformly mixed with the molar ratio of 1:9, in the initiation of ammonium persulfate solution (40wt%)
Lower carry out graft copolymerization, the additive amount of ammonium persulfate solution are polycarboxylate water-reducer molecule main chain and polycarboxylate water-reducer molecule side
The 4% of chain monomer gross mass, side chain graft density domination 9%, the molecular weight control of graft copolymerization product 40000~
45000, obtain low entraining, the diminishing of high water reduction guarantor's plastotype protects modeling component A；2) methacrylic acid and poly glycol monomethyl ether are pressed 2:
1 molar ratio carries out condensation reaction at 90 DEG C, continues 2.5h, and the polymeric monomer c with diminishing function is made；Then by maleic acid
Anhydride monomer reacts 5h at 110 DEG C by the molar ratio of 2:1 with diethylene glycol monobutyl ether, obtains the monomer d with reducing function；By institute
It obtains polymeric monomer c and monomer d and Sodium methacrylate is copolymerized by the molar ratio of 6:1:1, under initiator potassium persulfate effect,
The additive amount of initiator is the 3% of Sodium methacrylate quality, and diminishing is made in 70 DEG C of progress copolyreaction 4.5h and reduces component
B；3) diminishing is protected modeling component A to mix with diminishing decrement component B by the mass ratio of 1:1, is then added and accounts for the two gross mass
0.03% organic silicon defoamer and the dodecyl ether sulfate air entraining agent for accounting for the two gross mass 0.003% are uniformly mixed
Has low gas content amount to obtain the final product, high water reduction protects the additive of modeling, reducing function.
The performance test results of the resulting self-compaction cracking resistance clear-water concrete of Examples 1 to 2 are shown in Table 1-2.
Self-compaction cracking resistance clear-water concrete match ratio (kg/m3) described in table 1-1 Examples 1 to 2
Self-compaction cracking resistance clear-water concrete performance described in table 1-2 Examples 1 to 2
Embodiment 3~4
It is a kind of to prepare bridge self-compaction cracking resistance clear-water concrete (C50~C60) using high fine powder content Machine-made Sand, it prepares
Method includes the following steps:
1) each raw material is weighed by proportion described in table 2-1；In advance by light porous full water process of gathering materials, using preceding again by lightweight
Porous aggregate dries in the air to saturated dry surface, spare；
2) weighed Machine-made Sand, rubble and full water haydites of book structure of prewetting are poured into dry mixing 1min in agitated kettle according to the ratio and mixed
It closes uniformly, weighed cement, fly ash micro-sphere, silicon ash, the dry-mixed 1min of swelling agent continuation is then added and is uniformly mixed, and then will
Additive is mixed with water, is poured slowly into agitated kettle, and starts simultaneously at stirring, and duration 3min obtains uniform concrete
Mixture finally pours into the mold, the self-compaction cracking resistance that standard curing is prepared after 1d demoulding to get the high fine powder content Machine-made Sand
Clear-water concrete.The resulting self-compaction cracking resistance clear-water concrete performance such as table 2-2 of embodiment 3~4.
The preparation of the additive mixed in embodiment 3~4 is the following steps are included: 1) under the conditions of catalyst I, by acrylic acid
Copolyreaction 8h is carried out at a temperature of 70 DEG C by the molar ratio of 3:1 with methacrylic polyethylene glycol, wherein catalyst I is quality
The p-methyl benzenesulfonic acid solution of score 1.5%, the additive amount of catalyst I are the 5% of acrylic acid quality, obtain polycarboxylate water-reducer point
Sub- main chain；By ethylene oxide, 1:2 is at 140 DEG C in molar ratio with propylene oxide, using potassium hydroxide as basic catalyst II, hydrogen
Potassium oxide volume is the 0.35% of reaction system (ethylene oxide and propylene oxide) gross mass, carries out random copolymerization, control copolymerization
Object obtains polycarboxylate water-reducer molecule side chain monomer in 85~90 polymerization scopes, by gained polycarboxylate water-reducer molecule master
Chain is uniformly mixed with polycarboxylate water-reducer molecule side chain monomer with the molar ratio of 1:9.5, in ammonium persulfate solution (30wt%)
Graft copolymerization is carried out under initiation, the additive amount of ammonium persulfate solution is polycarboxylate water-reducer molecule main chain and polycarboxylic acids diminishing
The 6% of agent molecule side chain monomer gross mass, 9%, the molecular weight control of graft copolymerization product exists side chain graft density domination
35000~40000, obtain low entraining, the diminishing of high water reduction guarantor's plastotype protects modeling component A；2) by methacrylic acid and polyethyleneglycol
Methyl ether carries out condensation reaction by the molar ratio of 2.5:1 at 95 DEG C, continues 5h, and the polymeric monomer c with diminishing function is made；Then
Maleic anhydride monomer is reacted into 6h at 120 DEG C by the molar ratio of 3:1 with Dipropylene glycol mono-n-butyl Ether, obtains the list with reducing function
Body d；Gained polymeric monomer c and monomer d and Sodium methacrylate are copolymerized by the molar ratio of 6:1.5:1, in initiator over cure
Under the effect of sour potassium, the additive amount of initiator is Sodium methacrylate quality, 4%, subtract 70 DEG C of progresss copolyreaction 4h are obtained
Water reduces component B；3) diminishing is protected modeling component A to mix with diminishing decrement component B by the mass ratio of 3:2, is then added and accounts for
The organic silicon defoamer of the two gross mass 0.04% and the dodecyl ether sulfate bleed for accounting for the two gross mass 0.005%
Agent, be uniformly mixed have to obtain the final product low gas content amount, high water reduction protect modeling, reducing function additive.
The self-compaction cracking resistance clear-water concrete match ratio (kg/m3) of table 2-1 embodiment 3~4
3~4 gained self-compaction cracking resistance clear-water concrete performance of table 2-2 embodiment
The above results show the present invention different intensity grades can be designed according to Practical Project demand (C30~
C60), the present invention utilizes its air content≤2.0% of the bridge self-compaction cracking resistance clear-water concrete of high fine powder content Machine-made Sand preparation,
The equal < 15mm of loss of the slump and divergence after slump > 240mm, divergence > 600mm, 2h, shrinking percentage≤2 90d ×
10-4, cracking resistance grade is V grade；With excellent self-compaction cracking resistance, can be improved clear-water concrete engineering speed of application and
Construction quality meets the requirement of clear-water concrete presentation quality.
Comparative example 1~2
Comparative example 1~2 is using common clear-water concrete formula of current engineering and preparation method thereof, with C50~C60 intensity
For grade, raw material include cement, flyash, Machine-made Sand, rubble, water-reducing agent, water；Cement uses high Sheng in the raw material
PO42.5 ordinary portland cement, rubble are the basaltic broken stone of 5~20mm continuous grading, and flat-elongated particles mass content is
7%, crush values 6% are identical as embodiment；Machine-made Sand need to be by washing or other processing to limit fine powder content, fineness modulus
It is 2.83, fine powder mass content is 5.8%, methylene blue number 1.1；Flyash is commercially available common I grade of flyash, water demand ratio
It is 94%, loss on ignition 3.5%, stability is qualified, crosses 45 μm of square hole screens and tails over 9%；Water-reducing agent is commercially available common polycarboxylic acids
Water-reducing agent, water are ordinary tap water.Preparation method of concrete is similar with embodiment.It is specific to be as follows: with when conservation system
Match ratio (the kg/m of the clear-water concrete of table 3-1 comparative example 1~23)
The performance test results of 1~2 gained self-compaction cracking resistance clear-water concrete of table 3-2 comparative example
By above-mentioned comparative example 1~2 with the comparison of embodiment 3~4 as can be seen that in the condition for reaching identical concrete grade
Under, cement amount needed for present invention gained concrete technology of preparing is lower, and folk prescription concrete water amount is less；The present invention is using high
The working performance of the clear-water concrete of fine powder content Machine-made Sand preparation, cracking resistance are obviously improved, and the shrinking percentage of concrete 90d is aobvious
It writes and reduces, there is better finishing effect.
The above is only a preferred embodiment of the present invention, it is noted that come for those of ordinary skill in the art
It says, without departing from the concept of the premise of the invention, make several modifications and variations, these belong to protection model of the invention
It encloses.
Claims (9)
1. a kind of bridge self-compaction cracking resistance clear-water concrete prepared using high fine powder content Machine-made Sand, each component and its volume packet
It includes: 280~380kg/m of cement3, 30~80kg/m of fly ash micro-sphere3, 20~40kg/m of silicon ash3, 20~35kg/m of swelling agent3,
700~750kg/m of Machine-made Sand3, 900~1100kg/m of rubble3, the light porous 50~100kg/m that gathers materials3, additive 3.5~
7kg/m3, 120~160kg/m of water3；
The preparation method of the additive the following steps are included: 1) by acrylic acid and methacrylic polyethylene glycol with (3.5~
4.5): 1 molar ratio is heated to 60~90 DEG C of progress 5~8h of copolyreaction under the action of catalyst I, and wherein catalyst I is
The p-methyl benzenesulfonic acid solution that mass concentration is 1~2%, the additive amount of catalyst I are the 5~10% of acrylic acid quality, obtain poly- carboxylic
Sour water-reducing agent molecular backbone；By ethylene oxide and propylene oxide with (1~3): 1 molar ratio is at 100~150 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；By polycarboxylate water-reducer molecule main chain and polycarboxylate water-reducer molecule side chain monomer with 1:(7~12)
Molar ratio be uniformly mixed, mass concentration be 30~50% ammonium persulfate solution initiation conditions under carry out graft copolymerization,
The additive amount of ammonium persulfate solution is by polycarboxylate water-reducer molecule main chain and polycarboxylate water-reducer molecule side chain monomer gross mass
3~6%, 9~9.5%, the molecular weight of graft copolymerization product is controlled between 35000~55000 for grafting density control, is obtained
Diminishing protects modeling component A；2) in molar ratio (1~3) by double bond containing acid and poly glycol monomethyl ether: 1 at a temperature of 80~100 DEG C
2~4h of condensation reaction is carried out, the polymeric monomer c with diminishing function is made；Then by maleic acid anhydride monomer and diethylene glycol two
Propandiols monobutyl ether presses (2~3): 1 molar ratio reacts the monomer that 4~6h preparation has reducing function at 100~130 DEG C
d；Then gained polymeric monomer c and monomer d and Sodium methacrylate are pressed into (5~7): (1~1.5): 1 molar ratio, in initiator
Under the action of potassium peroxydisulfate, the additive amount of initiator is the 2~4% of Sodium methacrylate quality, under conditions of 50~80 DEG C
3~5h of copolyreaction is carried out, diminishing is made and reduces component B；3) diminishing is protected into modeling component A and diminishing decrement component B in mass ratio
2/3~3/2 is mixed, and organic silicon defoamer and air entraining agent is then added, and is uniformly mixed up to the additive, wherein have
The additive amount of machine silicon defoaming agent and air entraining agent be respectively diminishing protect modeling component A and diminishing decrement component B gross mass 0.03~
0.06% and 0.002~0.005%.
2. bridge self-compaction cracking resistance clear-water concrete according to claim 1, which is characterized in that the fineness of the Machine-made Sand
Modulus 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 powder
Partial size≤0.75 μm.
3. bridge self-compaction cracking resistance clear-water concrete according to claim 1, which is characterized 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. bridge self-compaction cracking resistance clear-water concrete according to claim 1, which is characterized 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. bridge self-compaction cracking resistance clear-water concrete according to claim 1, which is characterized in that the expansion of the swelling agent
Source is MgO or calcium sulphoaluminate-calcium oxide, chlorine ions content < 0.05%, 7d limited expansion rate > 0.03 in water, air
Middle limited expansion rate >=-0.01 21d.
6. bridge self-compaction cracking resistance clear-water concrete according to claim 1, which is characterized 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%.
7. bridge self-compaction cracking resistance clear-water concrete according to claim 1, which is characterized in that described light porous to gather materials
For 900 grades of broken shale haydites, bulk density is 860~900kg/m3, cylindrical compress strength is greater than 6.5MPa, water absorption rate > 8%.
8. bridge self-compaction cracking resistance clear-water concrete according to claim 1, which is characterized in that the double bond containing acid is
Methacrylic acid or acrylic acid；The air entraining agent is dodecyl ether sulfate class air entraining agent.
9. the preparation method of any one of the claim 1~8 bridge self-compaction cracking resistance clear-water concrete, which is characterized in that packet
It includes following steps: 1) weighing each raw material: 280~380kg/m of cement according to the ratio3, 30~80kg/m of active fly ash microballon3, silicon ash
20~40kg/m3, 20~35kg/m of swelling agent3, 700~750kg/m of Machine-made Sand3, 900~1100kg/m of rubble3, light porous
Gather materials 50~100kg/m3, 3.5~7kg/m of additive3, 120~160kg/m of water3；2) by it is light porous gather materials carry out at full water
Reason, using it is preceding again by it is light porous gather materials dry in the air to saturated dry surface, it is spare；3) by Machine-made Sand, rubble, it is light porous gather materials by
It matches preparatory dry mixing to be uniformly mixed, weighed cement, fly ash micro-sphere, silicon ash, swelling agent then will be added and continue dry mixing mixing
Uniformly, additive is mixed with water 4), is poured slowly into agitated kettle, and starts simultaneously at stirring, the duration is 2~3min, is obtained
To the concrete mixture mixed, 5) mixture mixed is poured into the mold, is conserved to get high fine powder content mechanism sand bridge
Beam self-compaction cracking resistance clear-water concrete.
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