CN107265966A - One kind prepares bridge self-compaction cracking resistance clear-water concrete using high fine powder content Machine-made Sand - Google Patents

One kind prepares bridge self-compaction cracking resistance clear-water concrete using high fine powder content Machine-made Sand Download PDF

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Publication number
CN107265966A
CN107265966A CN201710326386.9A CN201710326386A CN107265966A CN 107265966 A CN107265966 A CN 107265966A CN 201710326386 A CN201710326386 A CN 201710326386A CN 107265966 A CN107265966 A CN 107265966A
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China
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water
concrete
compaction
cracking resistance
made sand
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CN201710326386.9A
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CN107265966B (en
Inventor
丁庆军
徐意
邓利明
黄祥国
柯文汇
刘勇强
石华
耿春东
张扬
杨军
刘凯
王欢
牟廷敏
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Wuhan Municipal Engineering Mechanized Construction Co Ltd
Wuhan University of Technology WUT
Wuhan Municipal Construction Group Co Ltd
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Wuhan Municipal Engineering Mechanized Construction Co Ltd
Wuhan University of Technology WUT
Wuhan Municipal Construction Group Co Ltd
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions 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
    • C04B28/04Portland cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/34Non-shrinking or non-cracking materials
    • C04B2111/343Crack resistant materials

Abstract

Prepare bridge self-compaction cracking resistance clear-water concrete using high fine powder content Machine-made Sand the invention discloses one kind, 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 from.The present invention substitutes conventional 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 service behaviour and mobility retention property of concrete;Meanwhile, the present invention combine swelling agent and it is light porous gather materials can effectively improve the volume stability and anti-early-age crack performance of clear-water concrete.Gained self-compaction cracking resistance clear-water concrete of the invention is to different fine powder content Machine-made Sand wide adaptabilities, and service behaviour, mechanical property, volume stability and cracking resistance are excellent, and appearance luster is homogeneous, with preferable mirror effect.

Description

One kind prepares bridge self-compaction cracking resistance clear-water concrete using high fine powder content Machine-made Sand
Technical field
The invention belongs to building material field, and in particular to one kind prepares bridge self-compaction using high fine powder content Machine-made Sand Cracking resistance clear-water concrete and preparation method thereof.
Background technology
With the development of society, Urban Bridge Construction will not only meet the requirement of military service performance and used life, Er Qiexu Meet it is attractive in appearance, the characteristics of be adapted with environment, therefore using High-performance clean water concrete be modern bridge construction develop must Right trend.Generally, natural river sand need to be used by preparing bridge High-performance clean water concrete, however, national supply side reform in recent years Implementation, resources conservation and environmental requirement more and more higher to building material industry, for protection 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 particle diameter≤0.75 μm is inevitably introduced in production process Stone flour and mud powder, big to the adsorbance of additive with the concrete that this is prepared, 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 is constructed Technical specification》JTG TF50-2011 are made that limitation to concrete with the content of stone powder in Machine-made Sand.But take washing Machine-made Sand The measure for removing fine powder again can severe contamination environment, increase concrete raw material cost and construction costs.Meanwhile, box beam and T beams Bottom present position reinforcing bar density is big, and reinforcing bar close quarters concrete is difficult to vibrate fully, therefore, to bridge fair-faced concrete Service behaviour requires higher, is constrained, once concrete shrinkage is excessive, easily draws by internal intensive reinforcing bar after concrete hardening Hair cracking, aggravation is outside to corrode, and Corrosion Reinforcement reduces the service life of bridge.
Therefore, it is that development bridge clear water is mixed to prepare bridge self-compaction cracking resistance clear-water concrete using high fine powder content Machine-made Sand Solidifying soil in the urgent need to wide researching value and social benefit.
The content of the invention
Mixed it is an object of the invention to provide a kind of bridge self-compaction cracking resistance clear water prepared using high fine powder content Machine-made Sand Solidifying soil, its service behaviour, mechanical property, volume stability and cracking resistance are excellent, and appearance luster is homogeneous, with preferable crystalline substance Face effect;And to the Machine-made Sand wide adaptability of different fine powders (including stone flour and mud powder) content, with important practical application valency Value.
To achieve the above object, the technical solution adopted by the present invention is:
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 from for raw material, each group Divide and its volume is: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, it is additional 3.5~7kg/m of agent3, 120~160kg/m of water3
According to such scheme, the cement is PO 42.5 or the portland cements of PO 52.5.
According to such scheme, specific surface area >=1300m of the fly ash micro-sphere2/ kg, activity index >=101% needs water Ratio≤95% is measured, crystal structure is amorphous state.
According to such scheme, activity index >=105%, SiO of the silicon ash2Mass content >=90%, loss on ignition≤ 5%, specific surface area is >=16000m2/kg。
According to such 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.), its chlorine ions content < 0.05%, 7d limited expansion rates > 0.03 in water, 21d is limited in air Expansion rate >=-0.01.
According to such scheme, the modulus of fineness of the Machine-made Sand is fine powder (stone flour and mud powder) in 2.3~3.0, Machine-made Sand Mass content is 8~20%, crush values≤7%, methylene blue number < 1.5.
It is preferred that, the mass content of fine powder is 10~18% in the Machine-made Sand.
In such scheme, the high fine powder content Machine-made Sand refers to fine powder particle diameter≤0.75 μm of Machine-made Sand, and fine powder contains Measure as 8~20%;Its fine powder content is higher than national respective standard to stone 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 is less than C30, C30 Fine powder mass content is no more than 10%, 7% and 5% in~C60, the concrete Machine-made Sand more than C60.
According to such 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 such 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 more than 6.5MPa, water absorption rate > 8%.
According to such scheme, the preparation method of the additive comprises the following steps:1) by acrylic acid and methacrylic Polyethylene glycol is with (3.5~4.5):1 mol ratio be heated in the presence of catalyst I 60~90 DEG C carry out copolyreaction 5~ 8h, wherein catalyst I are the p-methyl benzenesulfonic acid solution that mass concentration is 1~2%, and catalyst I addition is acrylic acid quality 5~10%, obtain polycarboxylate water-reducer molecule main chain;By oxirane and expoxy propane with (1~3):1 mol ratio is 100 At~150 DEG C, using potassium hydroxide as base catalyst II, potassium hydroxide volume for reaction system gross mass 0.2%~ 1%, random copolymerization is carried out, control copolymer obtains polycarboxylate water-reducer molecule side chain monomer in 80~90 polymerization scopes; By polycarboxylate water-reducer molecule main chain and polycarboxylate water-reducer molecule side chain monomer with 1:The mixed in molar ratio of (7~12) is uniform, Graft copolymerization, the addition of ammonium persulfate solution are carried out under initiation conditions of the mass concentration for 30~50% ammonium persulfate solution Measure as by the 3~6% of polycarboxylate water-reducer molecule main chain and polycarboxylate water-reducer molecule side chain monomer gross mass, grafting density control System is 9~9.5%, and the molecular weight of graft copolymerization product is controlled between 35000~55000, obtains diminishing and protects modeling component A;2) will Double bond containing acid and poly glycol monomethyl ether are in molar ratio (1~3):1 carries out 2~4h of condensation reaction at a temperature of 80~100 DEG C, The polymeric monomer c with diminishing function is made;Then maleic acid anhydride monomer and diethylene glycol DPG class monobutyl ether are pressed (2 ~3):1 mol ratio reacts 4~6h at 100~130 DEG C and prepares the monomer d with reducing function;Then by gained polymeric monomer C and monomer d and Sodium methacrylate press (5~7):(1~1.5):1 mol ratio, in the presence of initiator potassium persulfate, draws The addition 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 Obtain diminishing decrement component B;3) diminishing is protected into modeling component A to be mixed with diminishing decrement component B in mass ratio 2/3~3/2, then Organic silicon defoamer and air entraining agent are added, it is well mixed to produce 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 masses.
In such scheme, the addition of the organic silicon defoamer and air entraining agent is respectively to protect modeling component A with diminishing to reduce The 0.03~0.06% and 0.002~0.005% of component B gross masses.
In such scheme, the double bond containing acid is methacrylic acid or acrylic acid.
In such scheme, the air entraining agent is dodecyl ether sulfate class air entraining agent.
In such scheme, the diethylene glycol DPG class monobutyl ether is diethylene glycol monobutyl ether or dipropylene glycol mono butyl Ether etc..
According to such scheme, the water is ordinary tap water.
A kind of preparation method of above-mentioned bridge self-compaction cracking resistance clear-water concrete, it comprises the following steps:1) claim by proportioning 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, it is additional 3.5~7kg/m of agent3, 120~160kg/m of water3;2) by the light porous full water process of progress of gathering materials, using it is preceding again will be light porous Gather materials and dry in the air to saturated dry surface, it is standby;3) by Machine-made Sand, rubble, it is light porous gather materials be well mixed by matching advance dry mixing, Then cement, fly ash micro-sphere, silicon ash, swelling agent addition weighed continues dry mixing and is well mixed, and 4) additive is mixed with water Close, be poured slowly into agitated kettle, and start simultaneously at stirring, the duration is 2~3min, the concrete mixed, 5) will The concreting mixed enters mould, produces high fine powder content Machine-made Sand bridge self-compaction cracking resistance clear-water concrete.
The principle that the present invention is used for:
(1) present invention prepares clear-water concrete using the Machine-made Sand of high fine powder content instead of river sand, when thin in Machine-made Sand When powder (stone flour and mud powder) content is higher, gained concrete is big to the adsorbance of additive, working performance of concrete and homogeneity Difference, the problem of concrete easily occurs taking off bottom and bleeding, the present invention utilizes activity powder by mixing active fly ash microballon and silicon ash " ball effect " of the fly ash micro-bead in concrete can significantly reduce cement mortar shear stress, reduce concrete plastic viscosity, tool There is the characteristic of mineral diminishing;And its ultra-fine particle diameter, concrete density can be improved, improve cement mortar and coarse aggregate in concrete Between interface, reduce harmful pore, improve concrete strength and corrosion resistance;Silicon ash, which has, improves cohesiveness, water conservation Effect, it is to avoid the isolation excreting water phenomenon of clear-water concrete prepared by high fine powder content Machine-made Sand;Active fly ash microballon and silicon ash The compound interfacial transition zone that can be also effectively improved inside concrete gelling slurry, C-S-H gels relatively low generation Ca/Si are improved The ability of outside erosion is resisted, so as to improve the durability of clear-water concrete, and the mobility of Machine-made Sand clear-water concrete is improved And cohesiveness, the unification of clear-water concrete high fluidity and high cohesion is realized, effectively suppresses the floating of mineral admixture, carries The high homogeneity of concrete, makes to pour rear outward appearance color using bridge fair-faced concrete engineering prepared by high fine powder content Machine-made Sand Pool is homogeneous.
(2) the beam bottom reinforcing bar of bridge is intensive, and concrete is difficult to vibrate, and high fine powder content machine-made sand concrete shrink compared with Greatly, it is easy to crack.It is therefore desirable to which bridge fair-faced concrete has higher service behaviour and volume stability, it is contemplated that clear water The finishing effect of concrete, additive also needs possess low air-entraining performance;Additive collection low gas content amount that the present invention is researched and developed, high diminishing are protected Modeling and the decrement function such as performance be in one, it is to avoid the additive of different simple functions present in practical engineering application mutually The problems such as being not suitable with, reduce using effect.Additive of the present invention can improve the degree of scatter of cement granules, improve cement Cementing properties:With the progress of hydrated reaction of cement, polyether lateral chain is progressively hydrolyzed in cement strong basicity environment from main chain Reaction, improves the mobility holding capacity of concrete;Meanwhile, by the alkyl, polyether with reducing function, provide steric hindrance effect The polyethers answered and the amide group with the effect of ultra-dispersed cement granules are grafted in copolymer chain, it is possible to decrease concrete Shrink;Mix certain defoamer and air entraining agent again again, the air pocket for clear-water concrete outward 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 using the preparation of 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 larger shrinkage stress during contraction distortion, when shrinkage stress is more than the tensile strength of concrete When, the cracking of concrete structures will be caused, aggravation is outside to corrode and internal steel bar corrosion, reduces the service life of bridge. The swelling agent that the present invention is mixed 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 Slow in evolution to release water, reduction is dried caused by inside concrete humidity declines shrinks and self-constriction, reduces coagulation Native early-age crack sensitiveness;The additive of the present invention also has reducing function, can significantly reduce hair inside concrete gelling slurry Pore tension force and effectively suppress concrete shrinkage;The effect above acts synergistically, and can effectively improve the cracking resistance of gained concrete.
Compared with prior art, beneficial effects of the present invention are:
(1) present invention prepares self-compaction cracking resistance clear-water concrete, and preferably high activity, ore deposit using high fine powder content Machine-made Sand The active fly ash microballon of thing diminishing adjusts the silicon ash for gluing function as mineral admixture with possessing water conservation, effectively improves high fine powder Content Machine-made Sand prepares the bleeding of clear-water concrete presence, takes off bottom phenomenon, improves the cohesiveness of slurry, it is suppressed that density is lighter Particle floating, improve the homogeneity of concrete mortar, it is to avoid the aberration after fair-faced concrete molding, improve clear water The mirror effect of concrete.
(2) high performance additive that the present invention is developed is remarkably improved the service behaviour and mobility holding energy of concrete Power, the gel particles of inside concrete are dispersed, reduction cement consumption and folk prescription concrete water amount, improves concrete Compactness and intensity;Alkyl, polyether decrement group on water reducer can reduce the surface tension of hole solution in concrete mortar, subtract The contraction of few concrete, making the clear-water concrete of preparation has self-compacting ability, improves clear-water concrete engineering construction speed And construction quality.
(3) clear-water concrete technology of preparing of the invention is applied jointly by contraction principle is compensated 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 carried using silicon ash with fly ash micro-sphere The cohesiveness of high concrete, avoid light-weight aggregate On The Floating on the basis of, prepared further directed to high fine powder content Machine-made Sand Concrete shrinkage it is big, the problems such as early stage is easy to crack is shunk using swelling agent compensating concrete, refines pore structure;And it is preferably high Strong porous light gathers materials and water can be slowly released in concrete early strength evolution, and reduction declines due to inside concrete humidity It is caused it is dry shrink and self-constriction, reduce concrete bracing sensitiveness, realize bridge High-performance clean water concrete from The anti-cracking performance in early stage to full stage in later stage is lifted.
(4) present invention prepares bridge self-compaction cracking resistance clear-water concrete, the coagulation of preparation using high fine powder content Machine-made Sand The equal < 15mm of loss of the slump and divergence after native air content≤2.0%, slump > 240mm, divergence > 600mm, 2h, 90d shrinkage factor≤2 × 10-4, cracking resistance grade is V grade.With excellent self-compaction cracking resistance, clear-water concrete outward appearance is met The requirement of quality.
Embodiment
For the objects, technical solutions and advantages of the present invention are more clearly understood, with reference to embodiments, the present invention is entered Row is further described.It should be appreciated that specific embodiment described herein is not used to limit only to explain the present invention The present invention.
For a better understanding of the present invention, 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 specific embodiment described herein is only to explain the present invention, and without It is of the invention in limiting.
In following instance, cement uses the high Sheng Portland cements of PO 42.5;Silicon ash, which is purchased from the bright science and technology of insulting in Chengdu, to be had Limit company, its activity index is 105%, SiO2Mass content is 92%, and loss on ignition is 4.5%, and specific surface area is 17000m2/ kg;Fly ash micro-sphere builds up new material Science and Technology Ltd. by Tianjin and provided, and specific surface area is 1470m2/ kg, activity index is 103%, water demand ratio is 92%, amorphous state;The HCSA cement expansive materials that swelling agent purchase is produced from Tianjin Bao Ming companies, its Expansion sources are calcium sulphoaluminate-calcium oxide, and its chlorine ions content is 0.03%, and 7d limited expansion rates are 0.051, air in water Middle 21d limited expansion rates are 0.01;Mechanism grain fineness number modulus is 2.74, and crush values are 6.7%, and fine powder mass content is 14.3%, methylene blue number is 1.4;Rubble is the basaltic broken stone of 5~20mm continuous gradings, 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.
Embodiment 1~2
One kind prepares bridge self-compaction cracking resistance clear-water concrete (C30~C40) using high fine powder content Machine-made Sand, and it is prepared Method comprises the following steps:
1) proportioning weighs each raw material as described in table 1-1;In advance by the light porous full water process of progress of gathering materials, again will using preceding Through satisfy water process after it is light porous gather materials dry in the air to saturated dry surface, it is standby;
2) by the Machine-made Sand weighed, rubble and it is light porous gather materials pour into agitated kettle dry mixing 1min by proportioning and mix equal It is even, then add cement, fly ash micro-sphere, silicon ash, swelling agent and continue dry-mixed 1.5min and be well mixed, and then by additive with Water is mixed, and is poured slowly into agitated kettle, and starts simultaneously at stirring, and the duration is 3min, obtains uniform compound, finally pours Enter mould, standard curing after 1d form removals produces bridge self-compaction cracking resistance clear-water concrete prepared by the high fine powder content Machine-made Sand.
The preparation of additive comprises the following steps described in embodiment 1~2:1) under the conditions of catalyst I, by acrylic acid and Methacrylic polyethylene glycol presses 4:1 mol ratio carries out copolyreaction 6h at a temperature of 70 DEG C, and wherein catalyst I is quality point The p-methyl benzenesulfonic acid solution of number 1%, catalyst I addition is the 6% of acrylic acid quality, obtains polycarboxylate water-reducer molecule master Chain, by oxirane and expoxy propane in molar ratio 1:1 at 130 DEG C, and base catalyst II, hydroxide are used as using potassium hydroxide Potassium volume is the 0.5% of reaction system (oxirane and expoxy propane) gross mass, carries out random copolymerization, control copolymer is 85 ~90 polymerization scopes, obtain polycarboxylate water-reducer molecule side chain monomer, by gained polycarboxylate water-reducer molecule main chain with gathering Carboxylic acid water reducer molecular side chain monomer is with 1:9 mixed in molar ratio is uniform, in ammonium persulfate solution (40wt%) initiation Lower carry out graft copolymerization, the addition of ammonium persulfate solution is 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 diminishing guarantor's modeling component A that low entraining, high diminishing protect plastotype;2) methacrylic acid and poly glycol monomethyl ether are pressed 2: 1 mol 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 presses 2 with diethylene glycol monobutyl ether:1 mol ratio reacts 5h at 110 DEG C, obtains the monomer d with reducing function;By institute Obtain polymeric monomer c and monomer d and Sodium methacrylate presses 6:1:1 mol ratio carries out copolymerization, under initiator potassium persulfate effect, The addition of initiator is the 3% of Sodium methacrylate quality, copolyreaction 4.5h is carried out at 70 DEG C diminishing decrement component is made B;3) diminishing is protected into modeling component A and diminishing decrement component B and presses 1:1 mass ratio is mixed, and is then added and is accounted 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 well mixed Produce and possess low gas content amount, high diminishing guarantor modeling, the additive of reducing function.
The performance test results of the self-compaction cracking resistance clear-water concrete of the gained of embodiment 1~2 are shown in Table 1-2.
Self-compaction cracking resistance clear-water concrete match ratio (kg/m3) described in table 1-1 embodiments 1~2
Self-compaction cracking resistance clear-water concrete performance described in table 1-2 embodiments 1~2
Embodiment 3~4
One kind prepares bridge self-compaction cracking resistance clear-water concrete (C50~C60) using high fine powder content Machine-made Sand, and it is prepared Method comprises the following steps:
1) proportioning weighs each raw material as 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, standby;
2) Machine-made Sand weighed, rubble and full water haydites of book structure of prewetting are poured into dry mixing 1min in agitated kettle by proportioning and mixed Close uniform, then add the cement weighed, fly ash micro-sphere, silicon ash, the dry-mixed 1min of swelling agent continuation and be well mixed, and then will Additive is mixed with water, is poured slowly into agitated kettle, and starts simultaneously at stirring, and the duration is 3min, obtains uniform concrete Compound, finally pours into the mold, standard curing after 1d form removals, produces self-compaction cracking resistance prepared by the high fine powder content Machine-made Sand Clear-water concrete.The self-compaction cracking resistance clear-water concrete performance such as table 2-2 of the gained of embodiment 3~4.
The preparation of the additive mixed in embodiment 3~4 comprises the following steps:1) under the conditions of catalyst I, by acrylic acid 3 are pressed with methacrylic polyethylene glycol:1 mol ratio carries out copolyreaction 8h at a temperature of 70 DEG C, and wherein catalyst I is quality The p-methyl benzenesulfonic acid solution of fraction 1.5%, catalyst I addition is the 5% of acrylic acid quality, obtains polycarboxylate water-reducer point Sub- main chain;By oxirane and expoxy propane in molar ratio 1:2 at 140 DEG C, and base catalyst II, hydrogen are used as using potassium hydroxide Potassium oxide volume is the 0.35% of reaction system (oxirane and expoxy propane) gross mass, carries out random copolymerization, controls copolymerization Thing obtains polycarboxylate water-reducer molecule side chain monomer in 85~90 polymerization scopes, by gained polycarboxylate water-reducer molecule master Chain is with polycarboxylate water-reducer molecule side chain monomer with 1:9.5 mixed in molar ratio is uniform, in ammonium persulfate solution (30wt%) Graft copolymerization is carried out under initiation, the addition 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, side chain graft density domination is 9%, and the molecular weight control of graft copolymerization product exists 35000~40000, obtain diminishing guarantor's modeling component A that low entraining, high diminishing protect plastotype;2) by methacrylic acid and polyethyleneglycol Methyl ether presses 2.5:1 mol ratio carries out condensation reaction at 95 DEG C, continues 5h, and the polymeric monomer c with diminishing function is made;Then Maleic anhydride monomer and Dipropylene glycol mono-n-butyl Ether are pressed 3:1 mol ratio reacts 6h at 120 DEG C, obtains the list with reducing function Body d;Gained polymeric monomer c and monomer d and Sodium methacrylate are pressed 6:1.5:1 mol ratio carries out copolymerization, in initiator over cure Under the effect of sour potassium, the addition of initiator is Sodium methacrylate quality, 4%, carry out copolyreaction 4h at 70 DEG C and be made to subtract Water decrement component B;3) diminishing is protected into modeling component A and diminishing decrement component B and presses 3:2 mass ratio is mixed, and is then added and is accounted 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, well mixed produce possesses low gas content amount, high diminishing guarantor modeling, the additive of reducing function.
Self-compaction cracking resistance clear-water concrete match ratio (kg/m3) described in table 2-1 embodiments 3~4
The gained self-compaction cracking resistance clear-water concrete performance of table 2-2 embodiments 3~4
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, 90d shrinkage factor≤2 × 10-4, cracking resistance grade is V grade;With excellent self-compaction cracking resistance, can improve clear-water concrete engineering speed of application and Construction quality, meets the requirement of clear-water concrete presentation quality.
Comparative example 1~2
Clear-water concrete formula that comparative example 1~2 is commonly used using current engineering and preparation method thereof, with C50~C60 intensity Exemplified by grade, raw material include cement, flyash, Machine-made Sand, rubble, water reducer, water;Cement is contained using high in the raw material PO42.5 Portland cements, rubble is the basaltic broken stone of 5~20mm continuous gradings, and flat-elongated particles mass content is 7%, crush values 6% are identical with embodiment;Machine-made Sand need to limit fine powder content, modulus of fineness by washing or other processing For 2.83, fine powder mass content is 5.8%, and methylene blue number is 1.1;Flyash is commercially available common I grade of flyash, water demand ratio For 94%, loss on ignition is 3.5%, and stability is qualified, crosses 45 μm of square hole screens and tails over 9%;Water reducer is commercially available common polycarboxylic acids Water reducer, water is ordinary tap water.Preparation method of concrete is similar with embodiment.It is specific to match somebody with somebody when conservation system such as following table:
Match ratio (the kg/m of clear-water concrete described in table 3-1 comparative examples 1~23)
The performance test results of the gained self-compaction cracking resistance clear-water concrete of table 3-2 comparative examples 1~2
Above-mentioned comparative example 1~2 and embodiment 3~4 are contrasted as can be seen that reaching the condition of identical concrete grade Under, the 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 service behaviour of clear-water concrete prepared by fine powder content Machine-made Sand, cracking resistance are obviously improved, and concrete 90d shrinkage factor shows Write and reduce, with more preferable finishing effect.
Described above is only the preferred embodiment of the present invention, it is noted that come for one of ordinary skill in the art Say, without departing from the concept of the premise of the invention, make some modifications and variations, these belong to the protection model of the present invention Enclose.

Claims (10)

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 bag Include: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
2. bridge self-compaction cracking resistance clear-water concrete according to claim 1, it is characterised 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%, fine powder in Machine-made Sand Particle diameter≤0.75 μm.
3. bridge self-compaction cracking resistance clear-water concrete according to claim 1, it is characterised in that the fly ash micro-sphere Specific surface area >=1300m2/ kg, activity index >=101%, water demand ratio≤95%, crystal structure is amorphous state.
4. bridge self-compaction cracking resistance clear-water concrete according to claim 1, it is characterised in that the activity of the silicon ash refers to >=105%, SiO of number2Mass content >=90%, loss on ignition≤5%, specific surface area >=16000m2/kg。
5. bridge self-compaction cracking resistance clear-water concrete according to claim 1, it is characterised in that the expansion of the swelling agent Source is MgO or calcium sulphoaluminate-calcium oxide, its chlorine ions content < 0.05%, 7d limited expansion rates > 0.03, air in water Middle 21d limited expansion rate >=-0.01.
6. bridge self-compaction cracking resistance clear-water concrete according to claim 1, it is characterised in that the rubble is limestone Rubble or basaltic broken stone, 5~20 continuous gradings, mass content≤8% of flat-elongated particles, crush values≤10%.
7. bridge self-compaction cracking resistance clear-water concrete according to claim 1, it is characterised 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 more than 6.5MPa, water absorption rate > 8%.
8. bridge self-compaction cracking resistance clear-water concrete according to claim 1, it is characterised in that the preparation of the additive Method comprises the following steps:1) by acrylic acid and methacrylic polyethylene glycol with (3.5~4.5):1 mol ratio is in catalyst It is that mass concentration is 1~2% to first that 60~90 DEG C of progress 5~8h of copolyreaction, wherein catalyst I are heated in the presence of I Benzene sulfonic acid solution, catalyst I addition is the 5~10% of acrylic acid quality, obtains polycarboxylate water-reducer molecule main chain;By epoxy Ethane is with expoxy propane with (1~3):1 mol ratio, using potassium hydroxide as base catalyst II, is entered at 100~150 DEG C Row random copolymerization, control copolymer obtains polycarboxylate water-reducer molecule side chain monomer in 80~90 polymerization scopes;By poly- carboxylic Sour water reducer molecular backbone is with polycarboxylate water-reducer molecule side chain monomer with 1:The mixed in molar ratio of (7~12) is uniform, in quality Concentration carries out graft copolymerization under the initiation conditions for 30~50% ammonium persulfate solution, the addition of ammonium persulfate solution is will Polycarboxylate water-reducer molecule main chain and the 3~6% of polycarboxylate water-reducer molecule side chain monomer gross mass, grafting density is controlled 9 ~9.5%, the molecular weight of graft copolymerization product is controlled between 35000~55000, is obtained diminishing and is protected modeling component A;2) double bond will be contained Acid with poly glycol monomethyl ether in molar ratio (1~3):1 carries out 2~4h of condensation reaction at a temperature of 80~100 DEG C, and tool is made There is the polymeric monomer c of diminishing function;Then maleic acid anhydride monomer and diethylene glycol DPG class monobutyl ether are pressed into (2~3):1 Mol ratio reacted at 100~130 DEG C 4~6h prepare with reducing function monomer d;Then by gained polymeric monomer c and list Body d and Sodium methacrylate press (5~7):(1~1.5):1 mol ratio, in the presence of initiator potassium persulfate, initiator Addition be Sodium methacrylate quality 2~4%, under conditions of 50~80 DEG C carry out 3~5h of copolyreaction, be made subtract Water decrement component B;3) diminishing is protected into modeling component A to be mixed with diminishing decrement component B in mass ratio 2/3~3/2, then added Organic silicon defoamer and air entraining agent, it is well mixed to produce the additive, wherein, the addition of organic silicon defoamer and air entraining agent Respectively water protects the 0.03~0.06% and 0.002~0.005% of modeling component A and diminishing decrement component B gross masses.
9. bridge self-compaction cracking resistance clear-water concrete according to claim 8, it is characterised 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.
10. the preparation method of any one of the claim 1~9 bridge self-compaction cracking resistance clear-water concrete, it is characterised in that bag Include following steps:1) each raw material is weighed by proportioning:280~380kg/m of cement3, 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, it is light porous Gather materials 50~100kg/m3, 3.5~7kg/m of additive3, 120~160kg/m of water3;2) by the light porous full water of progress of gathering materials Reason, using it is preceding again by it is light porous gather materials dry in the air to saturated dry surface, it is standby;3) by Machine-made Sand, rubble, it is light porous gather materials by Match advance dry mixing to be well mixed, then will add the cement weighed, fly ash micro-sphere, silicon ash, swelling agent and continue dry mixing mixing Uniformly, 4) additive is mixed with water, is poured slowly into agitated kettle, and starts simultaneously at stirring, the duration is 2~3min, is obtained To the concrete mixture mixed, 5) compound mixed is poured into the mold, conserved, produce high fine powder content mechanism sand bridge Beam self-compaction cracking resistance clear-water concrete.
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CN108069663A (en) * 2017-12-29 2018-05-25 中建西部建设贵州有限公司 A kind of high pier stud machine-made sand concrete of morning strong retardation setting type and preparation method thereof
CN109053054A (en) * 2018-09-28 2018-12-21 徐州工润建筑科技有限公司 A kind of steam-cured machine-made sand concrete preparation method
CN110054457A (en) * 2019-04-29 2019-07-26 安徽建筑大学 Non-evaporating feeding lightweight ultra-high performance concrete of one kind and preparation method thereof
CN110240446A (en) * 2019-06-18 2019-09-17 中建西部建设贵州有限公司 A kind of self-compacting lightweight aggregate machine-made sand concrete and preparation method thereof
CN110467403B (en) * 2019-09-17 2021-09-14 江苏广宇建设集团有限公司 Large-expansion self-compaction fair-faced concrete material and preparation method thereof
CN110467403A (en) * 2019-09-17 2019-11-19 江苏广宇建设集团有限公司 It is a kind of to extend self-compaction clear-water concrete material and preparation method thereof greatly
CN110950604A (en) * 2019-12-17 2020-04-03 安徽建筑大学 SAP-based machine-made sand ultra-high-performance concrete and preparation method and application thereof
CN111116159A (en) * 2020-01-02 2020-05-08 华南理工大学 Phosphogypsum steel pipe concrete and preparation method thereof
CN111116159B (en) * 2020-01-02 2021-04-30 华南理工大学 Phosphogypsum steel pipe concrete and preparation method thereof
CN111233402A (en) * 2020-03-04 2020-06-05 中建西部建设湖南有限公司 Anti-cracking facing layer of cement concrete member and preparation method thereof
CN111517717A (en) * 2020-04-23 2020-08-11 中铁大桥科学研究院有限公司 Early-strength high-impermeability lining concrete and preparation method thereof
CN111689737A (en) * 2020-06-23 2020-09-22 中建西部建设贵州有限公司 Underwater pile foundation machine-made sand self-compacting concrete and preparation method thereof
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