CN107285710A - A kind of high-performance fiber concrete of C70 strength grades and preparation method thereof - Google Patents

A kind of high-performance fiber concrete of C70 strength grades and preparation method thereof Download PDF

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Publication number
CN107285710A
CN107285710A CN201710703554.1A CN201710703554A CN107285710A CN 107285710 A CN107285710 A CN 107285710A CN 201710703554 A CN201710703554 A CN 201710703554A CN 107285710 A CN107285710 A CN 107285710A
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parts
concrete
water
strength
agent
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CN107285710B (en
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郑山锁
董方园
明铭
张晓辉
张艺欣
郑捷
秦卿
王帆
侯丕吉
刘巍
李强强
郑淏
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Xian University of Architecture and Technology
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Xian University of Architecture and Technology
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/04—Portland cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
    • 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]
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/91—Use of waste materials as fillers for mortars or concrete

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

Abstract

The invention discloses a kind of high-performance fiber concrete of C70 strength grades and preparation method thereof, the mass parts composition of the concrete is as follows：380 400 parts of cement, 130 145 parts of water, 690 700 parts of river sand, 1,050 1080 parts of rubble, 90 120 parts of flyash, 45 80 parts of rice hull ash, 79 parts of water reducer, 10 11 parts of economization agent, 13 14.5 parts of exciting agent, 1.1 1.8 parts of cellulose fibre, 20 25 parts of Carboxy polymer, 1.8 1.9 parts of defoamer.The concrete of preparation has higher toughness and excellent endurance quality, there is higher adhesion strength between shaped steel, its rupture strength is not less than 15.7MPa, 28d cubic compressive strengths are not less than 72.35MPa, tensile splitting strength is not less than 6.69MPa, adhesion strength between shaped steel is not less than 4.34MPa, and 28d unstable state chloride diffusion coefficient is less than 68 × 10‑14m2/ s, 28d drying shrinkage are not more than 0.008%.For in reinforced concrete composite structure, can effectively play the cooperative work performance between shaped steel and concrete, make up bond between steel and concrete poor performance, the deficiency of the two respective mechanical property can not be given full play to.

Description

A kind of high-performance fiber concrete of C70 strength grades and preparation method thereof
Technical field
It is a kind of tool for mixing cellulose fibre, rice hull ash and Carboxy polymer the invention belongs to building material field There are higher toughness, high-durability, the concrete of high volume stability, and in particular to a kind of high-performance fiber of C70 strength grades Concrete and preparation method thereof.
Background technology
The annual production of China's silicon ash only has 3000t-4000t, can only meet the demand of part special concrete, limit it Largely use.And China, as large agricultural country, annual rice husk yield accounts for more than the 30% of Gross World Product in 40,000,000 more than t. At present, except part rice husk starts to be used for power plants generating electricity, most rice husk still can be stacked or open incineration naturally, this Sample both waste of resource, burning can discharge great amount of carbon dioxide pollution surrounding enviroment again.Rice hull ash for power plants generating electricity is being passed through The rice hull ash proportion produced after generating is smaller, if unreasonable development will also result in land occupation resource, pollution periphery sky Gas.As scientific and technological progress is found, contain 90%-96% in the rice hull ash that rice husk is burned under suitable condition and prepared Amorphous Si O2, its specific surface area even can reach 250m2/kg。
Normal concrete and high-performance concrete material cracking resistance are poor, low (it typically is compression strength for tensile strength 1/10-1/20), therefore, its fragility is big, poor toughness, and fragility is further obvious with the raising of strength grade of concrete.Should in height Under power or complex stress condition, the Brittleness of concrete will reduce the bearing capacity of component and structure or even safe and reliable Property.A certain amount of drying shrinkage and self-constriction can be also produced in course of hardening, and then produces certain micro-crack, to concrete Intensity and endurance quality produce harmful effect.
The content of the invention
It is an object of the invention to provide a kind of high-performance fiber concrete of C70 strength grades and preparation method thereof, profit Be easy to get material with market, using improved concrete stirring technology, is mixed by adding cellulose fibre, rice hull ash, active mineral Material, chemical admixture etc. are closed, the deficiencies such as big, the easy to crack, poor durability of normal concrete fragility are overcome, there is high volume to prepare The high-performance fiber concrete of the C70 strength grades of stability, high-durability and higher toughness.
To achieve the above object, technical scheme disclosed by the invention is：A kind of high-performance fiber coagulation of C70 strength grades Soil, includes the raw material of following mass fractions：
380-400 parts of cement, 130-145 parts of water, 690-700 parts of river sand, 1050-1080 parts of rubble, flyash 90-120 Part, 45-80 parts of rice hull ash, 7-9 parts of water reducer, 10-11 parts of economization agent, 13-14.5 parts of exciting agent, cellulose fibre 1.1-1.8 Part, 20-25 parts of Carboxy polymer, 1.8-1.9 parts of defoamer.
It is preferred that, in the concrete each component using mass fraction calculate optimal match ratio content as：
386 parts of cement, 141 parts of water, 696 parts of river sand, 1063 parts of rubble, 106 parts of flyash, 63 parts of rice hull ash, water reducer 7.8 parts, 10.6 parts of economization agent, 13.7 parts of exciting agent, 1.5 parts of cellulose fibre, 22 parts of carboxyl propyl benzene polymer, defoamer 1.8 Part.
Further, the cement is PO42.5R grades of Portland cements, selection and poly carboxylic acid series water reducer compatibility Good cement type.
Thick river sand during the river sand selection level is matched somebody with somebody well, modulus of fineness is 2.8-3.0.
The rubble selection level is with good, fine and close hard, the shaggy artificial rubble based on lime stone, particle diameter model Enclose for 5-20mm, match somebody with somebody according to continuous size fraction level.
The flyash uses I grade of flyash of power plant's high-quality, and its 45 μm of square hole screens tail over no more than 12%, and water demand ratio is not More than 95%, specific surface area should be greater than 400m2/kg。
The rice hull ash is to be burned, be made using ball mill grinding 20-30min at a temperature of 650-800 DEG C by rice husk Powder grey powder, its dioxide-containing silica is 93.6%, and particle diameter is 10-75 μm, and specific surface area is in 40-100m2Between/g.
The water reducer is polycarboxylate high performance water-reducing agent, and solid content is 20%, and water-reducing rate is more than 25%, to coagulation The compression strength of soil does not have harmful effect.
The economization agent selects JM-SRA type economization agents.
The defoamer uses U.S.'s Hexion AXILAT DF6352DD defoamers.
Further, the rice hull ash is burned by rice husk at a temperature of 650-800 DEG C, using ball mill grinding 20- Powder grey powder is made in 30min, and its dioxide-containing silica is 93.6%, and particle diameter is 10-75 μm, and specific surface area is in 40-100m2/g Between.
Further, the exciting agent uses Organic-inorganic composite exciting agent, is answered according to the raw material of following mass percent meters With into：
Sodium sulphate 60-68%, calcium chloride 30-38%, triethanolamine 1.5-2%.
Further, the cellulose fibre be UF500 cellulose fibres, length 2-3mm, a diameter of 15-20 μm, tension is strong Degree >=900MPa, modulus of elasticity >=8.5GPa, fracture elongation reaches 10%, and proportion is 1.1g/cm3, with good hydrophilic Property, higher bond stress and acid-proof alkaline.
Further, the Carboxy polymer is by having that Carboxy emulsion, water and auxiliary agent are obtained after well mixed Machine polymer, raw material composition by percentage to the quality is as follows：
Carboxy emulsion 48-50%, water 48-50%, auxiliary agent 1-2%.
Further, the Carboxy emulsion solid content is 46%, and film-forming temperature is 15 DEG C, emulsion pH=7.
Further, the auxiliary agent is polyacrylate defoamer.
The invention also discloses a kind of preparation method of the high-performance fiber concrete of C70 strength grades, including following step Suddenly：
1) mass fraction is added in the water of total Water 25% for 7-9 parts of water reducer, is designated as the aqueous solution 1；It will weigh Good 10-11 part economization agents and 1.8-1.9 parts of defoamers is added in the water of total Water 25%, is designated as the aqueous solution 2；
2) 690-700 parts of river sands, 1050-1080 parts of rubbles, 1.1-1.8 parts of cellulose fibres will be weighed in mass ratio to add Into mixer, uniform stirring 2-3min；
3) 380-400 parts of cement, 90-120 parts of flyash, 45-80 parts of rice hull ash and 13-14.5 parts then, are sequentially added Exciting agent, then the water of total Water remaining 50% is added in mixer, uniform stirring 2-3min；
4) then in mixer add step 1) in the aqueous solution 1, uniform stirring 3-4min；
5) mobility of mixture is finally observed, is continued step 1) the middle aqueous solution 2 and 20-25 parts of Carboxies prepared Polymer, uniform stirring 3-5min, discharging obtains prepared concrete mix；And be molded, conserve.
Concrete formation has two methods with maintenance in preparation method：
1) standard curing：Concrete batching system is poured into shaping, jolt ramming in cast iron die, is 20 ± 2 DEG C, phase in temperature To standing 1-2d in the standard curing room of humidity >=95%, then form removal was conserved in standard curing room to required age.
2) conserved in water：Concrete batching system is poured into shaping, jolt ramming in cast iron die, temperature is placed in for 20 ± 2 DEG C Environment in, test block surface cover wetting geotextiles, stand 1d, form removal, then in the pond of standard curing room (in pond For saturated limewater solution) in maintenance needed for age.
Fragility and existing fiber concrete and cement of the invention in order to overcome normal concrete and high performance concrete The shortcoming of based composites, using the cellulose fibre with water storage function and toughening effect and with ultrafine micropore structure Rice hull ash (rice hull ash with loose structure can absorb moisture), " the interior maintenance action " of two kinds of materials can promote binder materials Heat evolution velocity；In addition, by adding Carboxy polymer and economization agent in concrete, on the one hand can control and reduce mixed The micro-pore inside the contraction of soil, fill concrete is coagulated, concrete strength is improved；On the other hand due to Carboxy polymer Hydrated product and unhydrated particle are wrapped up in inside concrete film forming, discontinuous matrix network structure is formed, with cellulose fiber Dimension synergy, improves the toughness of concrete, and then reduce Cl-、SO4 2-、CO2Deng the intrusion of harmful ion, raising is finally reached The intensity and endurance quality of concrete, and lift the target of its toughness, plasticity and tensile strength.The present invention is by between each component Synergy binder materials aquation can be promoted more abundant, improve inside concrete microcosmic composition, reduce detrimental voids Quantity, makes concrete inner structure more closely knit, finally prepares with high intensity, high tenacity, high-durability, high volume stability The novel high-performance fiber concrete material of property.
Compared with the prior art, the beneficial effects of the invention are as follows：
1) cellulose fibre that uses has natural hydrophily and high-elastic model point in the present invention, can effectively suppress mixed The formation and development of the microcracks caused by factor such as solidifying soil plastic shrinkage, drying shrinkage, temperature change；Cellulose fiber surface has very Strong bond stress, has good cementitiousness with cement matrix, and spike protein gene is prevented in concrete cracking, prevents crack Further development, and the fracture of fiber can increase the energy dissipation capacity of concrete；In addition, cellulose fibre has unique fiber Cavity structure and huge specific surface area, its cavity structure can store part moisture, play " interior maintenance action ", promote coagulation The heat evolution velocity of soil.Therefore, can to improve the mechanical property and cracking resistance of concrete, impervious and freeze thawing resistance etc. resistance to for cellulose fibre Long performance.
2) rice hull ash obtained in the present invention by combusting rice hull, grinding contains more than 90% silica, with higher Pozzolanic activity, the particle of rice hull ash is tiny (particle is 10-75 μm), concrete dynamic modulus and net road structure inside rice hull ash particle Huge specific surface area is made it have, 40-100m can be reached2/g.Therefore, incorporation rice hull ash can make gelling material particles more Uniformly, level can play filling role, and then increase the cohesiveness of concrete with good；Secondly as big inside rice hull ash The microcellular structure of amount can retaining, play " interior maintenance action "；Further, since there is rice hull ash the volcanic ash similar to silicon ash to live Property, the Ca (OH) in partially or completely silicon ash, with concrete system can be replaced2The fine and close hard aquation sulphur aluminium of reaction generation Sour calcium, the rupture strength of raising concrete, compression strength, tensile splitting strength, endurance quality；Finally, rice hull ash is used as agricultural Waste material, as construction material replacing partial cement after being processed to, can be reduced due in rice husk burning and cement production process CO2Discharge capacity, and then concrete cost is reduced, the recycling of agricultural wastes is realized, the purpose of energy-conserving and environment-protective is reached.
3) Carboxy polymer used can improve toughness of concrete, endurance quality and concrete and type in the present invention Adhesion strength between steel.First, substantial amounts of surface reactive material can increase the wetting work of surface of aggregate in this kind of polymer With the cementitiousness that improvement is gathered materials between matrix effectively prevents the formation and development of microcrack and initial imperfection；In addition, should Birds of the same feather flock together compound the continuous net-shaped structure of space three-dimensional in concrete equivalent to microfibre, the anti-folding, anti-of concrete can be strengthened Curved intensity, improves the toughness of concrete；Polymer can be inside fill concrete hole, reduce harmful hole number, improve mixed The compaction rate of soil is coagulated, and then improves the endurance quality of concrete.
4) economization agent used can control to mix by reducing the surface tension of the water of pore in concrete in the present invention Coagulate plastic shrinkage of drying shrinkage, volume contraction and hardened early of soil etc..It is theoretical based on capillary tension, mixed in concrete suitable The economization agent of amount, it is possible to decrease the surface tension of the water of pore in concrete, to reach reduction concrete shrinkage deformation, improves mixed The anti-crack ability of soil is coagulated, and then improves the endurance quality of concrete.
5) exciting agent in the present invention uses Organic-inorganic composite exciting agent, is by sodium sulphate, calcium chloride and three ethanol Amine excites flyash activity jointly.Sodium sulphate is embodied in exciting for flyash, SO4-In Ca2+Under effect, with fly ash grain The gel on surface and the AlO being dissolved in liquid phase2-Reaction generation hydrated calcium aluminate sulfate AFt；In addition, SO4 2-Also aquation can be displaced Part SO in calcium silicates4 2-, the SO displaced4 2-Outer layer again and Ca2+Effect generation hydrated calcium silicate, persistently excites flyash Activity.Calcium chloride is excited to flyash, mainly by improving Ca in aquation system2+Concentration, formation aquation chloro-aluminate Gelling is mutually and drated calcium aluminate is come what is realized, and in addition, calcium chloride can also supplement sulphate activation powder as strong electrolyte Ca needed for coal ash active process2+, promote exciting for flyash activity.Triethanolamine is excited as organic flyash activity Agent, can be by from Fe, Al phase being complexed in hydration process in flyash, promoting the corrosion on fly ash grain surface and making The further aquation of active material in flyash.Synergy between sodium sulphate, calcium chloride and triethanolamine can be sufficient The hydration rate of binder materials in flyash activity, quickening system is excited, promotes the generation of hydrated product, and then improve concrete Intensity, endurance quality etc..
Above-mentioned measure can effectively improve compression strength, toughness, deformability, endurance quality of concrete etc., and strengthen Adhesion strength and cooperative transformation ability between concrete and shaped steel.The C70 intensity prepared by the method for the invention The high-performance fiber concrete of grade, rupture strength is not less than 15.7MPa, and 28d cubic compressive strengths are not less than 72.35MPa, Tensile splitting strength is not less than 4.34MPa not less than the adhesion strength between 6.69MPa, with shaped steel, and 28d unstable state chlorion expands Dissipate coefficient and be less than 68 × 10-14m2/ s, 28d drying shrinkage are not more than 0.008%.The present invention has prepared steady with high volume The high-performance fiber concrete of qualitative, high-durability and high tenacity, its raw material is easy to get, preparation technology simple, meets sustainable The requirement that development and Modern Green construction material are applied and promoted, is a kind of novel high-performance fiber concrete material of environmental protection Material.
Embodiment
With reference to embodiment, the present invention is described in further detail using embodiment, so that the advantage of the present invention is more easy to In being readily appreciated by one skilled in the art, but the protection domain being not intended to limit the invention.
The high-performance fiber concrete of C70 strength grades of the present invention, is prepared using following methods：
1) mass fraction is added in the water of total Water 25% for 7-9 parts of water reducer, is designated as the aqueous solution 1；It will weigh Good 10-11 part economization agents and 1.8-1.9 parts of defoamers is added in the water of total Water 25%, is designated as the aqueous solution 2；
2) 690-700 parts of river sands, 1050-1080 parts of rubbles, 1.1-1.8 parts of cellulose fibres will be weighed in mass ratio to add Into mixer, uniform stirring 2-3min；
3) 380-400 parts of cement, 90-120 parts of flyash, 45-80 parts of rice hull ash and 13-14.5 parts then, are sequentially added Exciting agent, then the water of total Water remaining 50% is added in mixer, uniform stirring 2-3min；
4) then in mixer add step 1) in the aqueous solution 1, uniform stirring 3-4min；
5) mobility of mixture is finally observed, is continued step 1) the middle aqueous solution 2 and 20-25 parts of Carboxies prepared Polymer, uniform stirring 3-5min, discharging obtains prepared concrete mix；And be molded, conserve.
Wherein：
Cement used is commercially available PO42.5 grades of Portland cement, and it has with poly carboxylic acid series water reducer good compatible Property.
River sand used is that modulus of fineness is thick river sand in 2.9, and apparent density is 2.59g/cm3, bulk density is 1.48g/cm3。
Rubble used is fine and close hard, shaggy lime stone, and particle diameter is 5-20mm, and uniformly continuous level is matched somebody with somebody, apparent close Spend for 2.7g/cm3, bulk density is 1.51g/cm3。
Flyash used is I grade of flyash of power plant's high-quality, and 0.045mm square hole screens tail over no more than 12%, and specific surface area is big In 400m2/ kg, particle diameter is in 5-20 μ ms.
Rice hull ash used is to be passed through to burn, using ball mill grinding 20- at a temperature of 650 DEG C -800 DEG C by rice husk Powder grey powder is made in 30min, and its dioxide-containing silica is 93.6%, and particle diameter is 10-75 μm, and specific surface area is in 40-100m2/g Between.
Water reducer used is polycarboxylate high performance water-reducing agent, and solid content is 20%, and pH value is 8.0, and water-reducing rate is 25% More than, 7d, 28d compressive strength rate are not less than 150%.
Economization agent used is the JM-SRA type economization agents that Architecture Science Inst. of Jiangsu Prov. develops.
Exciting agent used uses Organic-inorganic composite exciting agent, is formed according to the raw material compounding of following mass percent meters： Sodium sulphate 65.7%, calcium chloride 32.7%, triethanolamine 1.6%.
Defoamer used uses U.S.'s Hexion AXILAT DF6352DD defoamers.
Cellulose fibre used is the UF500 cellulose fibres that Burkeye companies of the U.S. research and develop, and the fiber is that hydrophily is fine Dimension, fibre length is 2-3mm, and 15-20 μm of diameter, tensile strength >=900MPa, modulus of elasticity >=8GPa, fracture elongation reaches 10%.
Carboxy polymer used is the organic polymer obtained by Carboxy emulsion, water and auxiliary agent after well mixed Thing, raw material composition by percentage to the quality is as follows：
Carboxy emulsion 49%, water 50%, auxiliary agent 1%.
Wherein, Carboxy emulsion solid content is 46%, and film-forming temperature is 15 DEG C, emulsion pH=7.Auxiliary agent is polyacrylic acid Ester defoamer.
Not be the same as Example is given below and further illustrates the present invention.
Embodiment 1
In the high-performance fiber concrete of the present embodiment C70 strength grades, the high-performance fiber concrete each component with The match ratio content that mass fraction is calculated is as follows：386 parts of cement, 141 parts of running water, 696 parts of river sand, 1063 parts of rubble, fine coal 106 parts of ash, 63 parts of rice hull ash, 7.8 parts of water reducer, 10.6 parts of economization agent, 13.7 parts of exciting agent, 1.5 parts of cellulose fibre, carboxyl 22 parts of propyl benzene polymer, 1.8 parts of defoamer.
Wherein：
The raw material of composite exciting agent mass percent meter：Sodium sulphate 68%, calcium chloride 30%, triethanolamine 2%.
The raw material of Carboxy polymer by percentage to the quality is as follows：
Carboxy emulsion 49%, water 50%, auxiliary agent 1%.
Above-mentioned each component is prepared into concrete by the following method：
1) water reducer is added in 25% aqueous solution, is designated as the aqueous solution 1；Load weighted economization agent and defoamer are added In the water for entering 25%, the aqueous solution 2 is designated as；
2) it is added to river sand, rubble, cellulose fibre is weighed in mass ratio in mixer, uniform stirring 2-3min；
3) a part cement, flyash, rice hull ash and exciting agent then, are sequentially added, 50% water is added in mixer, Uniform stirring 2-3min；
4) then in mixer add step 1) in the aqueous solution 1, uniform stirring 3-4min；
5) mobility of mixture, step 1 are finally observed) the middle aqueous solution 2 and Carboxy polymer prepared, is uniformly stirred 3-5min is mixed, is discharged, prepared concrete mix, shaping, maintenance is obtained.
The shaping of concrete and maintenance process are as follows in the present embodiment：
Concrete batching system is poured into cast iron die and is molded, 10s is vibrated using shake table, afterwards using vibrating head edge Die trial outer wall carries out contact vibration, to discharge bubble unnecessary in concrete batching system；After shaping, test block is placed in into temperature is In 20 ± 5 DEG C of environment, the geotextiles soaked in test block surface covering, standing 1d, form removal, then temperature is 20 ± 2 DEG C, relatively Humidity >=95% was conserved in standard curing room to required age.
Embodiment 2
Each component is with quality in the high-performance fiber concrete of the present embodiment C70 strength grades, high-performance fiber concrete The match ratio content that fraction is calculated is as follows：380 parts of cement, 145 parts of running water, 690 parts of river sand, 1080 parts of rubble, flyash 120 Part, the polymerization of 45 parts of rice hull ash, 7 parts of water reducer, 11 parts of economization agent, 14.5 parts of exciting agent, 1.1 parts of cellulose fibre, Carboxy 20 parts of thing, 1.8 parts of defoamer.
Wherein：
The raw material of composite exciting agent mass percent meter：Sodium sulphate 60%, calcium chloride 38%, triethanolamine 2%.
The raw material of Carboxy polymer by percentage to the quality is as follows：
Carboxy emulsion 48%, water 50%, auxiliary agent 2%.
Above-mentioned each component is prepared into concrete by the following method：
1) water reducer is added in 25% aqueous solution, is designated as the aqueous solution 1；Load weighted economization agent and defoamer are added In the water for entering 25%, the aqueous solution 2 is designated as；
2) it is added to river sand, rubble, cellulose fibre is weighed in mass ratio in mixer, uniform stirring 2-3min；
3) a part cement, flyash, rice hull ash and exciting agent then, are sequentially added, 50% water is added in mixer, Uniform stirring 2-3min；
4) then in mixer add step 1) in the aqueous solution 1, uniform stirring 3-4min；
5) mobility of mixture, step 1 are finally observed) the middle aqueous solution 2 and Carboxy polymer prepared, is uniformly stirred 3-5min is mixed, is discharged, prepared concrete mix, shaping, maintenance is obtained.
The shaping of concrete and maintenance process are as follows in the present embodiment：
Concrete batching system is poured into cast iron die and is molded, 10s is vibrated using shake table, afterwards using vibrating head edge Die trial outer wall carries out contact vibration, to discharge bubble unnecessary in concrete batching system；After shaping, test block is placed in into temperature is In 20 ± 5 DEG C of environment, the geotextiles of wetting are covered in test block surface, 1d, form removal, then in the pond of standard curing room is stood Maintenance age needed in (being saturated limewater solution in pond, coolant-temperature gage is 20 ± 2 DEG C).
Embodiment 3
In the high-performance fiber concrete of the present embodiment C70 strength grades, the high-performance fiber concrete each component with The match ratio content that mass fraction is calculated is as follows：400 parts of cement, 130 parts of running water, 700 parts of river sand, 1050 parts of rubble, fine coal 90 parts of ash, 80 parts of rice hull ash, 9 parts of water reducer, 10 parts of economization agent, 13 parts of exciting agent, 1.8 parts of cellulose fibre, Carboxy gather 25 parts of compound, 1.9 parts of defoamer.
Wherein：
The raw material of composite exciting agent mass percent meter：Sodium sulphate 65.5%, calcium chloride 33%, triethanolamine 1.5%.
The raw material of Carboxy polymer by percentage to the quality is as follows：
Carboxy emulsion 49%, water 50%, auxiliary agent 1%.
Above-mentioned each component is prepared into concrete by the following method：
1) water reducer is added in 25% aqueous solution, is designated as the aqueous solution 1；Load weighted economization agent and defoamer are added In the water for entering 25%, the aqueous solution 2 is designated as；
2) it is added to river sand, rubble, cellulose fibre is weighed in mass ratio in mixer, uniform stirring 2-3min；
3) a part cement, flyash, rice hull ash and exciting agent then, are sequentially added, 50% water is added in mixer, Uniform stirring 2-3min；
4) then in mixer add step 1) in the aqueous solution 1, uniform stirring 3-4min；
5) mobility of mixture, step 1 are finally observed) the middle aqueous solution 2 and Carboxy polymer prepared, is uniformly stirred 3-5min is mixed, is discharged, prepared concrete mix, shaping, maintenance is obtained.
The shaping of concrete and maintenance process are as follows in the present embodiment：
Concrete batching system is poured into cast iron die and is molded, 10s is vibrated using shake table, afterwards using vibrating head edge Die trial outer wall carries out contact vibration, to discharge bubble unnecessary in concrete batching system；After shaping, test block is placed in into temperature is In 20 ± 5 DEG C of environment, the geotextiles soaked in test block surface covering, standing 1d, form removal, then temperature is 20 ± 2 DEG C, relatively Humidity >=95% was conserved in standard curing room to required age.
The performance test results of the high-performance fiber concrete of different C70 strength grades manufactured in the present embodiment are given below As shown in table 1：
The high-performance fiber concrete test result of the embodiment 1-3 of table 1 C70 strength grades
As can be seen from the above Table 1, in embodiment 1 concrete best performance.Moreover, C70 strength grades of the present invention The 28d cubic compressive strengths of high-performance fiber concrete are not less than 72.35MPa, and split tensile strength is not less than 6.69MPa, anti-folding Intensity is not less than 4.34MPa, 28d unstable state chloride ion transport coefficients not less than the adhesion strength between 15.70MPa, with shaped steel DRCMNo more than 68 × 10-14m2/ s, 28d drying shrinkage are not more than 0.008%.It can thus be seen that C70 prepared by the present invention The high-performance fiber concrete of strength grade is a kind of concrete of good performance, can be answered as Modern Green construction material With.
Embodiments of the invention are the foregoing is only, are to combine specific optimal enforcement mode to the further detailed of the present invention Describe in detail bright, it is impossible to therefore limit the scope of the invention, those skill in the art related utilize present disclosure With method, or on the premise of not departing from present inventive concept, simple change or replacement are made, should be all considered as the present invention's In protection domain.The protection domain that protection scope of the present invention should be defined by disclosed claim is defined.

Claims (10)

1. a kind of high-performance fiber concrete of C70 strength grades, it is characterised in that fiber concrete includes following mass fractions Raw material：
380-400 parts of cement, 130-145 parts of water, 690-700 parts of river sand, 1050-1080 parts of rubble, 90-120 parts of flyash, rice 45-80 parts of shell ash, 7-9 parts of water reducer, 10-11 parts of economization agent, 13-14.5 parts of exciting agent, 1.1-1.8 parts of cellulose fibre, carboxylic 20-25 parts of base styrene-butadiene polymer, 1.8-1.9 parts of defoamer.
2. the high-performance fiber concrete of C70 strength grades according to claim 1, it is characterised in that the concrete Middle each component using mass fraction calculate match ratio content as：
386 parts of cement, 141 parts of water, 696 parts of river sand, 1063 parts of rubble, 106 parts of flyash, 63 parts of rice hull ash, water reducer 7.8 Part, 10.6 parts of economization agent, 13.7 parts of exciting agent, 1.5 parts of cellulose fibre, 22 parts of carboxyl propyl benzene polymer, 1.8 parts of defoamer.
3. the high-performance fiber concrete of C70 strength grades according to claim 1, it is characterised in that the cement is PO42.5R grades of Portland cements, selection and the good cement type of poly carboxylic acid series water reducer compatibility；
Thick river sand during the river sand selection level is matched somebody with somebody well, modulus of fineness is 2.8-3.0；
The rubble selection level matches somebody with somebody good, fine and close hard, the shaggy artificial rubble based on lime stone, and particle size range is 5-20mm；
The flyash uses I grade of flyash of power plant's high-quality, and its 45 μm of square hole screens tail over no more than 12%, and water demand ratio is not more than 95%, specific surface area should be greater than 400m2/kg；
The water reducer is polycarboxylate high performance water-reducing agent, and solid content is 20%, and the water-reducing rate of water reducer is more than 25%；
The economization agent is JM-SRA type economization agents；
The defoamer uses U.S.'s Hexion AXILAT DF6352DD defoamers.
4. the high-performance fiber concrete of C70 strength grades according to claim 1, it is characterised in that the rice hull ash It is to be burned by rice husk at a temperature of 650-800 DEG C, powder grey powder, its titanium dioxide is made using ball mill grinding 20-30min Silicone content is 93.6%, and particle diameter is 10-75 μm, and specific surface area is in 40-100m2Between/g.
5. the high-performance fiber concrete of C70 strength grades according to claim 1, it is characterised in that the exciting agent Using Organic-inorganic composite exciting agent, composite exciting agent is formed according to the raw material compounding of following mass percent meters：
Sodium sulphate 60-68%, calcium chloride 30-38%, triethanolamine 1.5-2%.
6. the high-performance fiber concrete of C70 strength grades according to claim 1, it is characterised in that the cellulose Fiber is UF500 cellulose fibres, and length is 2-3mm, a diameter of 15-20 μm, tensile strength >=900MPa, modulus of elasticity >= 8.5GPa, fracture elongation reaches 10%, and proportion is 1.1g/cm3。
7. the high-performance fiber concrete of C70 strength grades according to claim 1, it is characterised in that the carboxyl fourth Benzene polymer is the organic polymer obtained by Carboxy emulsion, water and auxiliary agent after well mixed, by percentage to the quality Raw material composition is as follows：
Carboxy emulsion 48-50%, water 48-50%, auxiliary agent 1-2%；
Further, the Carboxy emulsion solid content is 46%, and film-forming temperature is 15 DEG C, Carboxy emulsion pH=7；
Further, the auxiliary agent is polyacrylate defoamer.
8. the high-performance fiber concrete of C70 strength grades according to claim 1, it is characterised in that the high-performance The rupture strength of fiber concrete is not less than 15.7MPa, and 28d cubic compressive strengths are not less than 72.35MPa, and Split-tension of Rolled is strong Degree not less than between 6.69MPa, with shaped steel adhesion strength be not less than 4.34MPa, 28d chloride diffusion coefficients be less than 68 × 10-14m2/ s, 28d drying shrinkage are not more than 0.008%.
9. a kind of preparation method of the high-performance fiber concrete of C70 strength grades, it is characterised in that comprise the following steps：
1) mass fraction is added in the water of total Water 25% for 7-9 parts of water reducer, is designated as the aqueous solution 1；Will be load weighted 10-11 parts of economization agents and 1.8-1.9 parts of defoamers are added in the water of total Water 25%, are designated as the aqueous solution 2；
2) 690-700 parts of river sands, 1050-1080 parts of rubbles, 1.1-1.8 parts of cellulose fibres will be weighed in mass ratio to be added to and stir Mix in machine, uniform stirring 2-3min；
3) 380-400 parts of cement, 90-120 parts of flyash, 45-80 parts of rice hull ash and 13-14.5 parts then, are sequentially added to excite Agent, then the water of total Water remaining 50% is added in mixer, uniform stirring 2-3min；
4) then in mixer add step 1) in the aqueous solution 1, uniform stirring 3-4min；
5) finally observe the mobility of mixture, continue step 1) in the aqueous solution 2 prepared and 20-25 part Carboxies polymerizations Thing, uniform stirring 3-5min, discharging obtains prepared concrete mix；And be molded, conserve.
10. a kind of blanks and moulding and conserving method of the high-performance fiber concrete of C70 strength grades, it is characterised in that supported including standard Maintenance process in shield and water：
The standard curing method is：Concrete batching system is poured into cast iron die shaping, jolt ramming, temperature be 20 ± 2 DEG C, 1d-2d is stood in the standard curing room of relative humidity >=95%, then form removal was conserved in standard curing room to required age；
Method of curing is in the water：Concrete batching system is poured into cast iron die shaping, jolt ramming, be placed in temperature for 20 DEG C ± In 2 DEG C of environment, the geotextiles of wetting are covered in test block surface, 1d, form removal, then in the pond (water of standard curing room is stood Be saturated limewater solution in pond) in maintenance needed for age.
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CN108439912A (en) * 2018-05-14 2018-08-24 广州市玖珂瑭材料科技有限公司 A kind of assembled architecture prefabricated panel plaster and big quality plank wet combining high-strength mortar
CN113185212A (en) * 2020-09-23 2021-07-30 西安建筑科技大学 High-toughness high-cohesiveness C70-strength fiber concrete and preparation method thereof

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108439912A (en) * 2018-05-14 2018-08-24 广州市玖珂瑭材料科技有限公司 A kind of assembled architecture prefabricated panel plaster and big quality plank wet combining high-strength mortar
CN113185212A (en) * 2020-09-23 2021-07-30 西安建筑科技大学 High-toughness high-cohesiveness C70-strength fiber concrete and preparation method thereof

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