CN107324728A - A kind of high-performance fiber concrete of C80 strength grades and preparation method thereof - Google Patents

A kind of high-performance fiber concrete of C80 strength grades and preparation method thereof Download PDF

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Publication number
CN107324728A
CN107324728A CN201710703522.1A CN201710703522A CN107324728A CN 107324728 A CN107324728 A CN 107324728A CN 201710703522 A CN201710703522 A CN 201710703522A CN 107324728 A CN107324728 A CN 107324728A
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parts
water
concrete
carbon nano
defoamer
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CN107324728B (en
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郑山锁
董方园
王斌
张睿明
郑捷
宋明辰
王帆
侯丕吉
左河山
郑跃
关永莹
李健
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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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/02—Selection of the hardening environment
    • C04B40/0277—Hardening promoted by using additional water, e.g. by spraying water on the green concrete element
    • C04B40/0286—Hardening under water
    • 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]

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

Abstract

The invention discloses a kind of high-performance fiber concrete of C80 strength grades and preparation method thereof, the mass parts composition of the concrete is as follows：360 380 parts of cement, 125 140 parts of water, 700 720 parts of river sand, 1,020 1050 parts of rubble, 85 110 parts of flyash, 40 60 parts of rice hull ash, 67 parts of water reducer, 12 13 parts of exciting agent, 1.1 1.8 parts of cellulose fibre, 25 27 parts of Carboxy polymer, 10 13 parts of hydroxyl modification carbon nano tube dispersion liquid, 2.0 2.1 parts of defoamer.The concrete of preparation has higher toughness and excellent endurance quality, has between shaped steel compared with high bond strength.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 C80 strength grades and preparation method thereof
Technical field
The invention belongs to New Building Materials field, be one kind mix rice hull ash, cellulose fibre, Carboxy polymer with And high intensity, high tenacity and the high durability concrete of modified carbon nano-tube, and in particular to a kind of C80 intensity with high tenacity High-performance fiber concrete of grade and preparation method thereof.
Background technology
The tensile strength of normal concrete and cement-based material is low, poor toughness, in hardening process or under external loads effect A large amount of microcracks can be produced, the durability of concrete or cement-base composite material structure is had a strong impact on, structure service life is reduced. In order to overcome the fragility of normal concrete and high performance concrete, asbestos fibre, steel fibre, carbon fiber with toughening effect, Vinal, polypropylene fibre and the larger fiber of basalt fibre equal length are used in concrete, but above-mentioned Long stapled a large amount of uses are easily agglomerating in concrete, are unfavorable for the dispersed of aggregate, limit fiber mixed containing coarse aggregate Application in solidifying soil.
CNT is a kind of one dimension fibre material with Nano grade diameter and micron level length, and its draw ratio is high Up to 100-1000, modulus of elasticity (can reach 1TPa or so) is about 5 times of steel and density is the 1/6 of steel；Carbon is received The tensile strength of mitron then can reach 60GPa-150GPa, and compressive strength is 100GPa-170GPa, and breaking strain is in 30%- 50% scope.Because of its excellent Physical and mechanical properties, CNT is set to turn into preferable composite reinforcing fiber.But, by In carbon nano tube surface, completely smooth, defect is few, lack active group, relatively molten in water and various solution or composite Xie Du is relatively low, there is larger Van der Waals force between CNT in addition, there is very big surface free energy at surface, therefore carbon Spontaneous reunion or winding easily occurs between nanotube, CNT is had a strong impact on dispersed in some polymer. The present invention carries out disperseing and ultrasonically treated using surfactant to multi-walled carbon nanotube, is not cutting off CNT and is not destroying On the basis of its surface texture, obtain can in water stable dispersion modified multiwalled carbon nanotube dispersion liquid so that can It is enough in concrete, gives full play to its microfibre toughening effect.
Using the cellulose fibre with water storage function and toughening effect and the rice hull ash with ultrafine micropore structure (tool The rice hull ash for having loose structure can absorb moisture), " the interior maintenance action " of two kinds of materials can promote the aquation of binder materials to enter Journey；In addition, by adding Carboxy polymer and modified carbon nano-tube both components in concrete, to improve concrete Toughness, and make binder materials in hydration process aquation more fully, improve hydrated product crystal shape or even coagulation The compactness extent of native internal structure, reduces Cl-、SO4 2-、CO2Deng the intrusion of harmful ion, the intensity for improving concrete is finally reached And endurance quality, and lift the target of its toughness, plasticity and tensile strength.
The content of the invention
It is an object of the invention to provide a kind of high-performance fiber concrete of C80 strength grades and preparation method thereof, sheet Invention uses cellulose fibre, rice hull ash, modified carbon nano-tube, Carboxy polymer, cement, flyash, river sand, broken first Stone, chemical admixture (including water reducer, exciting agent, defoamer), water be prepared for it is a kind of have high volume stability, high tenacity, The fiber high performance concrete of high-durability, the C80 strength grades of superhigh intensity, overcomes that normal concrete fragility is big, Yi Kai Split, the deficiency such as poor durability.By adding the rice hull ash with volcano ash effect, physics filing effect and " interior maintenance action ", Cellulose fibre with toughening effect He " interior maintenance action ", the Carboxy polymer with decrement and toughening effect, with And the modified carbon nano-tube of microfibre filled toughening effect can be played etc., collaboration improves concrete performance between each component, and then It is configured to a kind of high-performance fiber of the C80 strength grades with high intensity, high volume stability, high-durability and higher toughness Concrete.
To achieve the above object, technical scheme disclosed by the invention is：
A kind of high-performance fiber concrete of C80 strength grades, includes the raw material of following mass fractions：
360-380 parts of cement, 125-140 parts of water, 700-720 parts of river sand, 1020-1050 parts of rubble, flyash 85-110 Part, 40-60 parts of rice hull ash, 6-7 parts of water reducer, 12-13 parts of exciting agent, 1.1-1.8 parts of cellulose fibre, Carboxy polymer 25-27 parts, 10-13 parts of hydroxyl modification carbon nano tube dispersion liquid, 2.0-2.1 parts of defoamer.
It is preferred that, in the concrete each component using mass fraction calculate optimal match ratio content as：
369 parts of cement, 133 parts of water, 714 parts of river sand, 1030 parts of rubble, 102 parts of flyash, 65 parts of rice hull ash, water reducer 6.6 parts, 12.5 parts of exciting agent, 1.5 parts of cellulose fibre, 26 parts of Carboxy polymer, hydroxyl modification carbon nano tube dispersion liquid 12 parts, 2.0 parts of defoamer.
The cement is PO52.5R grades of Portland cements.
Thick river sand during the river sand selection level is matched somebody with somebody well, modulus of fineness is 2.8-3.2.
Artificial rubble based on the rubble selection lime stone, particle size range is 5-16mm, is matched somebody with somebody according to continuous size fraction level.
Described 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%, water demand ratio No 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 water-reducing rate is more than 25%.
The defoamer uses U.S.'s Hexion AXILAT DF6352DD defoamers.
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 more than 90%, and particle diameter is 10-75 μm, and specific surface area is in 40-100m2Between/g.
The exciting agent use Organic-inorganic composite exciting agent, composite exciting agent according to following mass percent meters original Material compounding is formed：
Sodium sulphate 60-68%, calcium chloride 30-38%, triethanolamine 1.5-2%.
The cellulose fibre 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。
The hydroxyl modification carbon nano tube dispersion liquid is by made from following methods：
1) compound concentration is the 2.0M NaOH aqueous solution, weighs the NaOH water that 2 parts of multi-walled carbon nanotubes add 100 parts of preparations In solution, ultrasonically treated 5min；Carbon nano tube dispersion liquid is poured into autoclave, 180 DEG C of reaction 120min after sealing；It is cold afterwards But to room temperature, centrifuge, add deionized water and dilute and wash, remove clear liquid；Ultrasound 10min, is stirred again, vinylidene chloride filter Membrane filtration, it is neutrality that gained solid product, which is washed to filtrate,；12h is dried at 40 DEG C, surface hydroxyl oxygen-containing functional group is obtained Modified multiwalled carbon nanotube；
2) weigh step 1) in prepare the modified multiwalled carbon nanotube of the oxygen-containing functional group such as surface hydroxyl, surface-active 98 parts of 0.5 part of agent, 0.1 part of defoamer and deionized water, surfactant, defoamer and modified carbon nano-tube are distributed to successively In deionized water, stirring makes CNT be soaked completely by aqueous surfactant solution；Ultrasonically treated 30min；Afterwards to scattered Liquid carries out centrifugal sedimentation；
3) supernatant liquid is crossed into 300 mesh filter clothes, obtains carbon nano tube dispersion liquid 1；The CNT that bottom precipitation is reunited According to step 2) ultrasound 60min is carried out again, obtain hydroxyl modification in carbon nano tube dispersion liquid 2, carbon nano tube dispersion liquid 1 and 2 Multi-walled carbon nanotube uniform and stable can disperse in water.
The average caliber of the multi-walled carbon nanotube is 40-50nm, and length is 10-20 μm, purity >=98%；
The surfactant is Triton X-100；The defoamer uses U.S. Hexion AXILAT DF6352DD defoamers.
The Carboxy polymer 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 48-50%, water 48-50%, auxiliary agent 1-2%.
The Carboxy emulsion solid content is 46%, and film-forming temperature is 15 DEG C, emulsion pH=7；
The auxiliary agent is polyacrylate defoamer.
Present invention also offers a kind of preparation method of the high-performance fiber concrete of C80 strength grades, including following step Suddenly：
1) it is that 6-7 parts of water reducer and 10-13 parts of hydroxyl modification carbon nano tube dispersion liquids are added to total water by mass fraction In the water of amount 25%, the aqueous solution 1 is designated as；Load weighted 2.0-2.1 parts of defoamer is added in the water of total Water 25%, is designated as The aqueous solution 2；
2) 700-720 parts of river sands, 1020-1050 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) 360-380 parts of cement, 85-110 parts of flyash, 40-60 parts of rice hull ash and 12-13 parts then, are sequentially added sharp Agent is sent out, 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 25-27 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.
The novelty of the present invention is tied up to is mixed with the cellulose fibre with toughness reinforcing and interior maintenance action, tool in concrete There is a kind of carbon-free rice hull ash of novel active mineral admixture of interior maintenance action, and changing with toughness reinforcing and nano-filled effect Property multi-walled carbon nanotube.Synergy between each component can promote binder materials aquation more abundant, improve in concrete The microcosmic composition in portion, reduce detrimental voids quantity, make concrete inner structure more closely knit, finally prepare with high intensity, High tenacity, high-durability, the novel high-performance fiber concrete material of high volume stability.
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) present invention carries out disperseing and ultrasonically treated using surfactant to multi-walled carbon nanotube, is not cutting off carbon nanometer Pipe and do not destroy on the basis of its surface texture, obtain can in water stable dispersion modified multiwalled carbon nanotube dispersion liquid. Due to the nanometer size effect and skin effect of CNT, bridge linking effect is played as nano-scale fiber, control nanoscale splits The appearance and development of seam, add intensity of concrete base material etc.；In addition, the micro-packing effect of CNT, can be filled Most of detrimental voids of inside concrete, increase the compactness of concrete, improve each side such as toughness of concrete, endurance quality Performance.
4) 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.
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 C80 intensity prepared by the method for the invention The high-performance fiber concrete of grade, 28d cubic compressive strengths are not less than 83.25MPa, and split tensile strength is not less than 8.15MPa, Rupture strength is not less than 4.39MPa, 28d unstable state chloride ion transports not less than the adhesion strength between 19.09MPa, with shaped steel Coefficient DRCMLess than 47 × 10-14m2/s.The present invention has been prepared with superhigh intensity, high volume stability, high-durability and height The high-performance fiber concrete of toughness, its raw material is easy to get, preparation technology simple, meets sustainable development and Modern Green building Materials application and the requirement of popularization, are a kind of novel high-performance fiber concrete materials of environmental protection.
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 C80 strength grades of the present invention, is prepared using following methods：
1) it is that 6-7 parts of water reducer and 10-13 parts of hydroxyl modification carbon nano tube dispersion liquids are added to total water by mass fraction In the water of amount 25%, the aqueous solution 1 is designated as；Load weighted 2.0-2.1 parts of defoamer is added in the water of total Water 25%, is designated as The aqueous solution 2；
2) 700-720 parts of river sands, 1020-1050 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) 360-380 parts of cement, 85-110 parts of flyash, 40-60 parts of rice hull ash and 12-13 parts then, are sequentially added sharp Agent is sent out, 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 25-27 parts of Carboxies prepared Polymer, uniform stirring 3-5min, discharging obtains prepared concrete mix；And be molded, conserve.
Wherein：
Cement used is PO52.5R grades of Portland cements, and it is good with poly carboxylic acid series water reducer compatibility.
Thick river sand during river sand selection level used is matched somebody with somebody well, modulus of fineness is 2.8-3.2, and preferably modulus of fineness is 2.9, Apparent density is 2.59g/cm3, bulk density is 1.48g/cm3。
Artificial rubble based on rubble selection lime stone used, particle size range is 5-16mm, is matched somebody with somebody according to continuous size fraction level, table Sight density is 2.7g/cm3。
Flyash used 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 is more than 400m2/kg。
Rice hull ash used is to be passed through to burn, using ball mill grinding 20-30min at a temperature of 650-800 DEG C by rice husk It is made, its dioxide-containing silica is 93.6%, and particle diameter is 10-75 μm, and specific surface area is in 40-100m2Between/g.
Water reducer used is polycarboxylate high performance water-reducing agent, and solid content is 20%, and pH value is 8.0 or so, and water-reducing rate exists More than 25%, 7d, 28d compressive strength rate are not less than 150%.
Exciting agent used uses Organic-inorganic 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%.
Defoamer used is 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 length 2-3mm, tension is strong Degree >=900MPa, modulus of elasticity is 8.5GPa, and proportion is 1.1g/cm3, with good hydrophily, higher bond stress and resistance to Soda acid performance.
Carbon nano tube dispersion liquid used is hydroxyl modification carbon nano tube dispersion liquid, is to sequentially pass through alkali by multi-walled carbon nanotube Hydro-thermal reaction under the conditions of property obtains hydroxyl modification multi-wall carbon nano-tube pipe powder, then with surfactant and auxiliary agent in deionization Obtained in water after decentralized processing.Preparation method is as follows：
1) compound concentration is 2.0M sodium hydrate aqueous solution, weighs the hydrogen that 2 parts of multi-walled carbon nanotubes add 100 parts of preparations In aqueous solution of sodium oxide, ultrasonically treated 5min；Carbon nano tube dispersion liquid is poured into the stainless steel with politef liner high Reactor is pressed, 180 DEG C of reaction 120min after sealing；Room temperature is cooled to after end and is centrifuged that (centrifugation rate is 2000r/ Min, centrifugation time 30min), then add deionized water and dilute and wash, remove clear liquid, repeatedly 2 times；It is then ultrasonic again 10min, by a diameter of 0.2 μm of vinylidene chloride membrane filtration after stirring, gained solid product is cleaned with deionized water to filter Liquid pH=7；12h is dried at 40 DEG C in vacuum drying oven, the modification multi-wall carbon nano-tube of the oxygen-containing functional groups such as surface hydroxyl is obtained Pipe；
2) weigh step 1) in prepare the modified multiwalled carbon nanotube of the oxygen-containing functional group such as surface hydroxyl, surface-active 98 parts of 0.5 part of agent, 0.1 part of defoamer and deionized water, surfactant, defoamer and modified carbon nano-tube are distributed to successively In deionized water, stirring makes CNT be soaked completely by aqueous surfactant solution；Ultrasonically treated 30min；Afterwards to scattered Liquid carries out centrifugal sedimentation (centrifugation rate is 2000r/min, centrifugation time 30min)；
3) after centrifugation terminates, supernatant liquid is crossed into 300 mesh filter clothes, carbon nano tube dispersion liquid 1 is obtained；By bottom precipitation (i.e. The CNT of reunion) according to step 2) ultrasound 60min is carried out again, obtain carbon nano tube dispersion liquid 2, carbon nano tube dispersion liquid Hydroxyl modification multi-walled carbon nanotube uniform and stable can disperse in water in 1 and 2.
The average caliber of multi-walled carbon nanotube used is 40-50nm, and length is 10-20 μm, purity >=98%.
Surfactant used be Triton X-100, pH=7.0,63 DEG C of cloud point is a kind of non-ionic table Face activating agent；Adjuvant used is U.S.'s Hexion AXILAT DF6352DD defoamers.
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 48-50%, water 48-50%, auxiliary agent 1-2%；
Wherein, Carboxy emulsion solid content is 46%, and film-forming temperature is 15 DEG C, Carboxy emulsion pH=7；Auxiliary agent is Polyacrylate defoamer.
Concrete formation has two methods with maintenance in preparation method used：
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.
Specific embodiment is given below to further illustrate preparation method of the present invention.
The match ratio of high-performance fiber concrete in the embodiment 1-3 of table 1 (in terms of the mass fraction of each component)
The performance of high performance concrete in the embodiment 1-3 of table 2
As can be seen from the above Table 2, the high-performance fiber concrete of C80 strength grades of the present invention, 28d cube pressure resistances Degree is not less than 83.25MPa, and split tensile strength is not less than 8.15MPa, and rupture strength is not less than viscous between 19.09MPa, with shaped steel Knotting strength is not less than 4.39MPa, 28d unstable state chloride ion transport coefficients DRCMLess than 47 × 10-14m2/s.It can thus be seen that The high-performance fiber concrete of C80 strength grades prepared by the present invention is a kind of concrete of good performance, it is adaptable in the modern times Green construction material application.
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 C80 strength grades, it is characterised in that fiber concrete includes following mass fractions Raw material：
360-380 parts of cement, 125-140 parts of water, 700-720 parts of river sand, 1020-1050 parts of rubble, 85-110 parts of flyash, rice 40-60 parts of shell ash, 6-7 parts of water reducer, 12-13 parts of exciting agent, 1.1-1.8 parts of cellulose fibre, Carboxy polymer 25-27 Part, 10-13 parts of hydroxyl modification carbon nano tube dispersion liquid, 2.0-2.1 parts of defoamer.
2. the high-performance fiber concrete of C80 strength grades according to claim 1, it is characterised in that the concrete Middle each component using mass fraction calculate match ratio content as：
369 parts of cement, 133 parts of water, 714 parts of river sand, 1030 parts of rubble, 102 parts of flyash, 65 parts of rice hull ash, water reducer 6.6 Part, 12.5 parts of exciting agent, 1.5 parts of cellulose fibre, 26 parts of Carboxy polymer, hydroxyl modification carbon nano tube dispersion liquid 12 Part, 2.0 parts of defoamer.
3. the high-performance fiber concrete of C80 strength grades according to claim 1, it is characterised in that the cement is PO52.5R grades of Portland cements；
Thick river sand during the river sand selection level is matched somebody with somebody well, modulus of fineness is 2.8-3.2；
Artificial rubble based on the rubble selection lime stone, particle size range is 5-16mm, is matched somebody with somebody according to continuous size fraction level；
Described 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 little In 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 water-reducing rate is more than 25%；
The defoamer uses U.S.'s Hexion AXILAT DF6352DD defoamers.
4. the high-performance fiber concrete of C80 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 more than 90%, and particle diameter is 10-75 μm, and specific surface area is in 40-100m2Between/g.
5. the high-performance fiber concrete of C80 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 C80 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 C80 strength grades according to claim 1, it is characterised in that the hydroxyl changes Property carbon nano tube dispersion liquid is by made from following methods：
1) compound concentration is the 2.0M NaOH aqueous solution, weighs the NaOH aqueous solution that 2 parts of multi-walled carbon nanotubes add 100 parts of preparations In, ultrasonically treated 5min；Carbon nano tube dispersion liquid is poured into autoclave, 180 DEG C of reaction 120min after sealing；After be cooled to Room temperature, is centrifuged, and is added deionized water and is diluted and wash, removes clear liquid；Ultrasound 10min, is stirred, vinylidene chloride filter membrane mistake again Filter, it is neutrality that gained solid product, which is washed to filtrate,；12h is dried at 40 DEG C, the modification of surface hydroxyl oxygen-containing functional group is obtained Multi-walled carbon nanotube；
2) weigh step 1) in prepare surface hydroxyl oxygen-containing functional group modified multiwalled carbon nanotube, surfactant 0.5 Part, 98 parts of 0.1 part of defoamer and deionized water, by surfactant, defoamer and modified carbon nano-tube be distributed to successively from In sub- water, stirring makes CNT be soaked completely by aqueous surfactant solution；Ultrasonically treated 30min；Dispersion liquid is entered afterwards Row centrifugal sedimentation；
3) supernatant liquid is crossed into 300 mesh filter clothes, obtains carbon nano tube dispersion liquid 1；The CNT that bottom precipitation is reunited according to Step 2) ultrasound 60min is carried out again, obtain many walls of hydroxyl modification in carbon nano tube dispersion liquid 2, carbon nano tube dispersion liquid 1 and 2 CNT uniform and stable can disperse in water；
The average caliber of the multi-walled carbon nanotube is 40-50nm, and length is 10-20 μm, purity >=98%；
The surfactant is Triton X-100；
The defoamer is U.S.'s Hexion AXILAT DF6352DD defoamers.
8. the high-performance fiber concrete of C80 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%；
The Carboxy emulsion solid content is 46%, and film-forming temperature is 15 DEG C, Carboxy emulsion pH=7；
The auxiliary agent is polyacrylate defoamer.
9. a kind of preparation method of the high-performance fiber concrete of C80 strength grades, it is characterised in that comprise the following steps：
1) it is that 6-7 parts of water reducer and 10-13 parts of hydroxyl modification carbon nano tube dispersion liquids are added to total Water by mass fraction In 25% water, the aqueous solution 1 is designated as；Load weighted 2.0-2.1 parts of defoamer is added in the water of total Water 25%, water is designated as Solution 2；
2) 700-720 parts of river sand, 1020-1050 parts of rubbles, 1.1-1.8 parts of cellulose fibres will be weighed in mass ratio to be added to In mixer, uniform stirring 2-3min；
3) 360-380 parts of cement, 85-110 parts of flyash, 40-60 parts of rice hull ash and 12-13 parts of exciting agents then, are sequentially added, The water of total Water remaining 50% is added in mixer again, 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 25-27 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 C80 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, 1-2d 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 shaping, jolt ramming in cast iron die, it is 20 ± 2 to be placed in temperature DEG C environment in, test block surface cover wetting geotextiles, stand 1d, form removal, then in the saturation lime of standard curing room Conserved in the pond of the aqueous solution to required age.
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CN113024182A (en) * 2020-09-23 2021-06-25 西安建筑科技大学 High-toughness high-cohesiveness C80-strength fiber concrete and preparation method thereof
CN115093187A (en) * 2022-06-20 2022-09-23 临海市忠信新型建材有限公司 Preparation and construction process of self-leveling mortar for filling and leveling ground

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Publication number Priority date Publication date Assignee Title
CN111995309A (en) * 2020-08-31 2020-11-27 武汉大学 Geopolymer for marine concrete outer protective layer and preparation method thereof
CN113024182A (en) * 2020-09-23 2021-06-25 西安建筑科技大学 High-toughness high-cohesiveness C80-strength fiber concrete and preparation method thereof
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CN115093187B (en) * 2022-06-20 2023-02-14 临海市忠信新型建材有限公司 Preparation and construction process of self-leveling mortar capable of being used for ground filling and leveling

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