CN107512888A - A kind of high-performance fiber concrete of C140 strength grades and preparation method thereof - Google Patents

A kind of high-performance fiber concrete of C140 strength grades and preparation method thereof Download PDF

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Publication number
CN107512888A
CN107512888A CN201710702381.1A CN201710702381A CN107512888A CN 107512888 A CN107512888 A CN 107512888A CN 201710702381 A CN201710702381 A CN 201710702381A CN 107512888 A CN107512888 A CN 107512888A
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parts
water
concrete
strength
fiber concrete
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CN107512888B (en
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郑山锁
荣先亮
董方园
郑捷
董立国
张晓辉
龙立
阮升
张睿明
宋明辰
丛峻
王岱
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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
    • C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B14/02—Granular materials, e.g. microballoons
    • C04B14/022—Carbon
    • C04B14/026—Carbon of particular shape, e.g. nanotubes
    • 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
    • C04B16/00—Use of organic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of organic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B16/04—Macromolecular compounds
    • C04B16/06—Macromolecular compounds fibrous
    • 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
    • C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
    • C04B18/04—Waste materials; Refuse
    • C04B18/06—Combustion residues, e.g. purification products of smoke, fumes or exhaust gases
    • C04B18/10—Burned or pyrolised refuse
    • C04B18/101—Burned rice husks or other burned vegetable material
    • 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
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/023—Chemical treatment
    • 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
    • C04B2201/10—Mortars, concrete or artificial stone characterised by specific physical values for the viscosity
    • 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
    • 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

Abstract

The invention discloses a kind of high-performance fiber concrete of C140 strength grades and preparation method thereof, the mass parts composition of the concrete is as follows：465 480 parts of cement, 100 110 parts of water, 730 760 parts of river sand, 1,000 1050 parts of rubble, 55 95 parts of flyash, 55 75 parts of rice hull ash, 55 75 parts of silicon ash, 13 14.5 parts of water reducer, 15 15.5 parts of exciting agent, 1.1 1.8 parts of cellulose fibre, 30 33 parts of hydroxyl modification carbon nano tube dispersion liquid, 2.4 2.5 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 30.68MPa, 28d cubic compressive strengths are not less than 142.36MPa, split tensile strength is not less than 12.31MPa, adhesion strength between shaped steel is not less than 6.04MPa, unstable state chloride ion transport coefficient DRCMNo more than 16 × 10‑14m2/s.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 C140 strength grades and preparation method thereof
Technical field
The invention belongs to New Building Materials field, is that one kind mixes rice hull ash, cellulose fibre and modified carbon nano-tube High intensity, high tenacity and high durability concrete, and in particular to a kind of high-performance of the C140 strength grades with high tenacity Fiber concrete 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, have a strong impact on the durability of concrete or cement-base composite material structure, reduce structure service life. 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 and 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 60-150GPa, and compressive strength 100-170GPa, breaking strain is in 30-50% scopes.Cause Its excellent Physical and mechanical properties, CNT is set to turn into preferable composite reinforcing fiber.But due to CNT Surface is completely smooth, defect is few, lacks active group, and the relative solubility in water and various solution or composite is relatively low, In addition larger Van der Waals force between CNT be present, very big surface free energy at surface be present, thus CNT it Between spontaneous reunion or winding easily occurs, have a strong impact on that CNT is dispersed in some polymer.The present invention makes Multi-walled carbon nanotube is disperseed and is ultrasonically treated with surfactant, CNT is not being cut off and is not destroying its surface knot On the basis of structure, obtain can in water stable dispersion modified multiwalled carbon nanotube dispersion liquid so that it can be used in mixing In solidifying soil, its microfibre toughening effect is given full play to.
Using the cellulose fibre with water storage function and toughening effect and the (tool of the rice hull ash with ultrafine micropore structure 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 both components of addition modified carbon nano-tube in concrete, to improve the toughness of concrete, and make gelling Material in hydration process aquation more fully, improve the densification of the crystal shape or even concrete inner structure of hydrated product Degree, reduce Cl-、SO4 2-、CO2Deng the intrusion of harmful ion, the intensity and endurance quality for improving concrete are finally reached, and is carried Rise 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 C140 strength grades and preparation method thereof, sheet Invention is first using cellulose fibre, rice hull ash, modified carbon nano-tube, cement, flyash, river sand, rubble, chemical admixture (including water reducer, exciting agent, defoamer), water are prepared for a kind of with high volume stability, high tenacity, high-durability, superelevation The fiber high performance concrete of the C140 strength grades of intensity, overcome big, easy to crack, poor durability of normal concrete fragility etc. Deficiency.By add with volcano ash effect, physics filing effect and " interior maintenance action " rice hull ash, have toughening effect and The cellulose fibre of " interior maintenance action ", and the modified carbon nano-tube of microfibre filled toughening effect can be played etc., each component Between collaboration improve concrete performance, and then be configured to a kind of there is high intensity, high volume stability, high-durability and compared with high-ductility The high-performance fiber concrete of the C140 strength grades of property.
To achieve the above object, technical scheme disclosed by the invention is：
A kind of high-performance fiber concrete of C140 strength grades, include the raw material of following mass fractions：
Cement 465-480 parts, water 100-110 parts, river sand 730-760 parts, rubble 1000-1050 parts, flyash 55-95 Part, rice hull ash 55-75 parts, silicon ash 55-75 parts, water reducer 13-14.5 parts, exciting agent 15-15.5 parts, cellulose fibre 1.1- 1.8 parts, hydroxyl modification carbon nano tube dispersion liquid 30-33 parts, defoamer 2.4-2.5 parts.
Preferably, in the concrete each component using mass fraction calculate optimal match ratio content as：
472 parts of cement, 108 parts of water, 1020 parts of rubble, 750 parts of river sand, 68 parts of flyash, 68 parts of rice hull ash, silicon ash 68 Part, 13.8 parts of water reducer, 15.2 parts of exciting agent, 1.6 parts of cellulose fibre, 32 parts of hydroxyl modification carbon nano tube dispersion liquid, defoaming 2.5 parts of agent.
The cement is PO52.5R level Portland cements.
Thick river sand during the river sand selection grading is good, modulus of fineness 2.8-3.2.
Artificial rubble based on the rubble selection lime stone, particle size range 5-16mm, according to continuous size fraction grading.
Described flyash uses the high-quality I grade of flyash of power plant, and its 45 μm of square hole screens are tailed over no more than 12%, water demand ratio No more than 95%, specific surface area should be greater than 400m2/kg。
The mass percent of silica is not less than 93% in the silicon ash, and pozzolanic activity index is more than 90%, averagely 0.1-0.15 μm of particle diameter, specific surface area are more than 15m2/g。
The water reducer is polycarboxylate high performance water-reducing agent, and solid content 20%, 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 at a temperature of 650-800 DEG C by rice husk, be made using ball mill grinding 20-30min Powder grey powder, its dioxide-containing silica are more than 90%, and particle diameter is 10-75 μm, and specific surface area is in 40-100m2Between/g.
The exciting agent uses Organic-inorganic composite exciting agent, composite exciting agent according to following mass percent meters original Material compounding forms：
Sodium sulphate 60-68%, calcium chloride 30-38%, triethanolamine 1.5-2%.
The cellulose fibre is UF500 cellulose fibres, length 2-3mm, a diameter of 15-20 μm, tensile strength >= 900MPa, modulus of elasticity >=8.5GPa, fracture elongation reach 10%, proportion 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, 5min is ultrasonically treated；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；Ultrasonic 10min again, stirring, vinylidene chloride filter Membrane filtration, gained solid product are washed to filtrate as neutrality；12h is dried at 40 DEG C, obtains the oxygen-containing functional groups such as surface hydroxyl Modified multiwalled carbon nanotube；
2) modified multiwalled carbon nanotube, the surface-active of the oxygen-containing functional groups such as the surface hydroxyl prepared in step 1) are weighed 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, CNT is set to be soaked completely by aqueous surfactant solution；It is 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 Ultrasonic 60min is carried out again according to step 2), obtains carbon nano tube dispersion liquid 2, hydroxyl modification in 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.
Present invention also offers a kind of preparation method of the high-performance fiber concrete of C140 strength grades, including following step Suddenly：
1) 13-14.5 parts water reducer and 30-33 part hydroxyl modification carbon nano tube dispersion liquids are added to the 25% of total Water Water in, be designated as the aqueous solution 1；Load weighted 2.4-2.5 parts defoamer is added in 25% water, be designated as the aqueous solution 2；
2) added 730-760 parts river sand, 1000-1050 parts rubble, 1.1-1.8 parts cellulose fibre is weighed in mass ratio Into mixer, uniform stirring 2-3min；
3) 465-480 parts cement, 55-95 parts flyash, 55-75 parts rice hull ash, 55-75 part silicon ashes then, are sequentially added With 15-15.5 part exciting agents, then 50% water of total water consumption is added in mixer, uniform stirring 2-3min；
4) then to the aqueous solution 1 added in mixer in step 1), uniform stirring 3-4min；
5) mobility of mixture is finally observed, continues the aqueous solution 2 that will be prepared in step 1), uniform stirring 3-5min, Discharging, obtain prepared concrete mix；And it is molded, conserves.
Concrete formation is to be conserved in water with maintenance process in preparation method：Concrete batching system is poured into cast iron die Middle shaping, jolt ramming, being placed in temperature is in 20 ± 2 DEG C of environment, in the geotextiles of test block surface covering wetting, stands 1d, form removal, Then conserved in the pond of the saturated limewater solution of standard curing room to required age.
The novelty of the present invention ties 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 used in the present invention has natural hydrophily and high-elastic model point, can effectively suppress mixed The formation and development of the microcracks caused by factor such as solidifying native plastic shrinkage, drying shrinkage, temperature change；Cellulose fiber surface has very Strong bond stress, there is good cementitiousness with cement matrix, prevent spike protein gene in concrete cracking, prevent 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 partial moisture, play " interior maintenance action ", promote coagulation The heat evolution velocity of soil.Therefore, it is resistance to can to improve mechanical property and cracking resistance, the impervious and freeze thawing resistance of concrete etc. for cellulose fibre Long performance.
2) rice hull ash obtained in the present invention by combusting rice hull, grinding contains more than 90% silica, has 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, grading is good, can play filling role, and then increase the cohesiveness of concrete；It is secondly as big inside rice hull ash The microcellular structure of amount can water storage, 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, improve the rupture strength of concrete, compression strength, tensile splitting strength, endurance quality；Finally, rice hull ash is as agricultural Waste material, construction material replacing partial cement is used as after being processed to, can 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, reaches the purpose of energy-conserving and environment-protective.
3) present invention is disperseed and is ultrasonically treated to multi-walled carbon nanotube using surfactant, 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.
Above-mentioned measure can effectively improve the compression strength of concrete, toughness, deformability, endurance quality etc., and strengthen Adhesion strength and cooperative transformation ability between concrete and shaped steel.The C140 intensity being prepared by the method for the invention The high-performance fiber concrete of grade, rupture strength are not less than 30.68MPa, and 28d cubic compressive strengths are not less than 142.36MPa, split tensile strength are not less than 6.04MPa not less than adhesion strength between 12.31MPa, with shaped steel, unstable state chlorine from Sub- transport coefficient DRCMNo more than 16 × 10-14m2/s.The present invention has prepared resistance to superhigh intensity, high volume stability, height The high-performance fiber concrete of long property and high tenacity, its raw material is easy to get, preparation technology is simple, meets sustainable development and modern times The requirement that green construction material is applied and promoted, is a kind of green novel high-performance fiber concrete 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 C140 strength grades of the present invention, is prepared using following methods：
1) 13-14.5 parts water reducer and 30-33 part hydroxyl modification carbon nano tube dispersion liquids are added to the 25% of total Water Water in, be designated as the aqueous solution 1；Load weighted 2.4-2.5 parts defoamer is added in 25% water, be designated as the aqueous solution 2；
2) added 730-760 parts river sand, 1000-1050 parts rubble, 1.1-1.8 parts cellulose fibre is weighed in mass ratio Into mixer, uniform stirring 2-3min；
3) 465-480 parts cement, 55-95 parts flyash, 55-75 parts rice hull ash, 55-75 part silicon ashes then, are sequentially added With 15-15.5 part exciting agents, then 50% water of total water consumption is added in mixer, uniform stirring 2-3min；
4) then to the aqueous solution 1 added in mixer in step 1), uniform stirring 3-4min；
5) mobility of mixture is finally observed, continues the aqueous solution 2 that will be prepared in step 1), uniform stirring 3-5min, Discharging, obtain prepared concrete mix；And it is molded, conserves.
Wherein：
Cement used is PO52.5R level Portland cements, and it is good with poly carboxylic acid series water reducer compatibility.
Thick river sand during river sand selection grading used is good, preferably modulus of fineness 2.8-3.2, modulus of fineness are 2.9, Apparent density is 2.59g/cm3, bulk density 1.48g/cm3。
Artificial rubble based on rubble selection lime stone used, particle size range 5-16mm, according to continuous size fraction grading, table Sight density is 2.7g/cm3。
Flyash used uses the high-quality I grade of flyash of power plant, and its 45 μm of square hole screens are tailed over no more than 12%, and water demand ratio is not More than 95%, specific surface area is more than 400m2/kg。
The mass percent of silica is not less than 93% in the silicon ash, and pozzolanic activity index is more than 90%, averagely 0.1 μm -0.15 μm of particle diameter, specific surface area are more than 15m2/g。
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 20%, 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.
The UF500 cellulose fibres that cellulose fibre used is researched and developed for Burkeye companies of the U.S., length 2-3mm, tension are strong Degree >=900MPa, modulus of elasticity 8.5GPa, proportion 1.1g/cm3, there is 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 pass through alkali successively 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, 5min is ultrasonically treated；It is high that carbon nano tube dispersion liquid is poured into the stainless steel with politef liner Reactor is pressed, 180 DEG C of reaction 120min after sealing；Room temperature is cooled to after end (centrifugation rate 2000r/ is centrifuged Min, centrifugation time 30min), then add deionized water and dilute and wash, removing clear liquid, 2 times repeatedly；It is then ultrasonic again 10min, cleaned after stirring by a diameter of 0.2 μm of vinylidene chloride membrane filtration, gained solid product with deionized water to filter Liquid pH=7；12h is dried at 40 DEG C in vacuum drying oven, obtains the modification multi-wall carbon nano-tube of the oxygen-containing functional groups such as surface hydroxyl Pipe.
2) modified multiwalled carbon nanotube, the surface-active of the oxygen-containing functional groups such as the surface hydroxyl prepared in step 1) are weighed 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, CNT is set to be soaked completely by aqueous surfactant solution；It is ultrasonically treated 30min；Afterwards to scattered Liquid carries out centrifugal sedimentation (centrifugation rate 2000r/min, centrifugation time 30min).
3) after centrifugation terminates, supernatant liquid is crossed into 300 mesh filter clothes, obtains carbon nano tube dispersion liquid 1；By bottom precipitation (i.e. The CNT of reunion) according to step 2) ultrasonic 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 is Triton X-100, pH=7.0,63 DEG C of cloud point, is a kind of nonionic table Face activating agent；Adjuvant used is U.S.'s Hexion AXILAT DF6352DD defoamers.
Concrete curing method is to be conserved in water in preparation method used：Concrete batching system is poured into cast iron die Middle shaping, jolt ramming, it is placed in the environment that temperature is 20 DEG C ± 2 DEG C, in the geotextiles of test block surface covering wetting, stands 1d, tear open Mould, then conserved in the pond of the saturated limewater solution of standard curing room to required 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 comparison result of high-performance fiber concrete is as shown in table 2 in embodiment 1-3.
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 C140 strength grades of the present invention, 28d cube resistance to compressions Intensity is not less than 142.36MPa, and split tensile strength is not less than 12.31MPa, and rupture strength is not less than between 30.68MPa, with shaped steel Adhesion strength be not less than 6.04MPa, unstable state chloride ion transport coefficient DRCMNo more than 16 × 10-14m2/s.It is possible thereby to see Go out, the high-performance fiber concrete of C140 strength grades prepared by the present invention is a kind of concrete of good performance, suitable for Modern 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 C140 strength grades, it is characterised in that fiber concrete includes following mass parts Several raw materials：
Cement 465-480 parts, water 100-110 parts, river sand 730-760 parts, rubble 1000-1050 parts, flyash 55-95 parts, rice Shell ash 55-75 parts, silicon ash 55-75 parts, water reducer 13-14.5 parts, exciting agent 15-15.5 parts, cellulose fibre 1.1-1.8 parts, Hydroxyl modification carbon nano tube dispersion liquid 30-33 parts, defoamer 2.4-2.5 parts.
2. the high-performance fiber concrete of C140 strength grades according to claim 1, it is characterised in that the concrete Middle each component using mass fraction calculate match ratio content as：
472 parts of cement, 108 parts of water, 1020 parts of rubble, 750 parts of river sand, 68 parts of flyash, 68 parts of rice hull ash, 68 parts of silicon ash, subtract 13.8 parts of aqua, 15.2 parts of exciting agent, 1.6 parts of cellulose fibre, 32 parts of hydroxyl modification carbon nano tube dispersion liquid, defoamer 2.5 Part.
3. the high-performance fiber concrete of C140 strength grades according to claim 1, it is characterised in that the cement is PO52.5R level Portland cements；
Thick river sand during the river sand selection grading is good, modulus of fineness 2.8-3.2；
Artificial rubble based on the rubble selection lime stone, particle size range 5-16mm, according to continuous size fraction grading；
Described flyash uses the high-quality I grade of flyash of power plant, and its 45 μm of square hole screens are tailed over no more than 12%, and water demand ratio is little In 95%, specific surface area should be greater than 400m2/kg；
The mass percent of silica is not less than 93% in the silicon ash, and pozzolanic activity index is more than 90%, average grain diameter 0.1 μm -0.15 μm, specific surface area is more than 15m2/g；
The water reducer is polycarboxylate high performance water-reducing agent, and solid content 20%, water-reducing rate is more than 25%；
The defoamer uses U.S.'s Hexion AXILAT DF6352DD defoamers.
4. the high-performance fiber concrete of C140 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 C140 strength grades according to claim 1, it is characterised in that the exciting agent Using Organic-inorganic composite exciting agent, composite exciting agent forms 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 C140 strength grades according to claim 1, it is characterised in that the cellulose Fiber is UF500 cellulose fibres, length 2-3mm, a diameter of 15-20 μm, tensile strength >=900MPa, modulus of elasticity >= 8.5GPa, fracture elongation reach 10%, proportion 1.1g/cm3。
7. the high-performance fiber concrete of C140 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, it is 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, centrifuge, add deionized water and dilute and wash, remove clear liquid；Ultrasonic 10min again, stirring, vinylidene chloride filter membrane mistake Filter, gained solid product are washed to filtrate as neutrality；12h is dried at 40 DEG C, obtains the modification of surface hydroxyl oxygen-containing functional group Multi-walled carbon nanotube；
2) modified multiwalled carbon nanotube, the surfactant 0.5 of the surface hydroxyl oxygen-containing functional group prepared in step 1) are weighed 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, CNT is set to be soaked completely by aqueous surfactant solution；It is 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；By bottom precipitation reunite CNT according to Step 2) carries out ultrasonic 60min again, obtains carbon nano tube dispersion liquid 2, the more walls of hydroxyl modification in 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 that U.S. Hexion AXILAT DF6352DD disappear Infusion.
8. the high-performance fiber concrete of C140 strength grades according to claim 1, it is characterised in that the high-performance The rupture strength of fiber concrete is not less than 30.68MPa, and 28d cubic compressive strengths are not less than 142.36MPa, split tensile strength It is not less than 6.04MPa, unstable state chloride ion transport coefficient D not less than the adhesion strength between 12.31MPa, with shaped steelRCMLess In 16 × 10-14m2/s。
9. a kind of preparation method of the high-performance fiber concrete of C140 strength grades, it is characterised in that comprise the following steps：
1) 13-14.5 parts water reducer and 30-33 part hydroxyl modification carbon nano tube dispersion liquids are added to 25% water of total Water In, it is designated as the aqueous solution 1；Load weighted 2.4-2.5 parts defoamer is added in 25% water, be designated as the aqueous solution 2；
2) it is added to and stirs 730-760 parts river sand, 1000-1050 parts rubble, 1.1-1.8 part cellulose fibres is weighed in mass ratio Mix in machine, uniform stirring 2-3min；
3) 465-480 parts cement, 55-95 parts flyash, 55-75 parts rice hull ash, 55-75 parts silicon ash and 15- then, are sequentially added 15.5 parts of exciting agents, then 50% water of total water consumption is added in mixer, uniform stirring 2-3min；
4) then to the aqueous solution 1 added in mixer in step 1), uniform stirring 3-4min；
5) mobility of mixture is finally observed, continues the aqueous solution 2 that will be prepared in step 1), uniform stirring 3-5min, discharging, Obtain prepared concrete mix；And it is molded, conserves.
A kind of 10. blanks and moulding and conserving method of the high-performance fiber concrete of C140 strength grades, it is characterised in that supported using in water Maintaining method, it is specific as follows：
Concrete batching system is poured into shaping, jolt ramming in cast iron die, is placed in the environment that temperature is 20 ± 2 DEG C, in test block The geotextiles of surface covering wetting, stand 1d, form removal, are then conserved in the pond of the saturated limewater solution of standard curing room To required age.
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110407536A (en) * 2019-07-31 2019-11-05 大连理工大学 A kind of carbon nanotube composite high-performance concrete having impact resistance
CN112329219A (en) * 2020-10-26 2021-02-05 中国科学院力学研究所 Method for calculating tensile damage area of rock containing micropores and microcracks in Brazilian splitting experiment
CN113024212A (en) * 2020-09-23 2021-06-25 西安建筑科技大学 High-tenacity high-cohesiveness C140-strength high-strength fiber concrete and preparation method thereof
CN113816695A (en) * 2021-10-26 2021-12-21 西安建筑科技大学 Carbon nanotube modified concrete and preparation method and application thereof
CN114014610A (en) * 2021-11-25 2022-02-08 华南理工大学 Carbon fiber reinforced ultra-high performance concrete and preparation method thereof

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1843904A (en) * 2006-03-30 2006-10-11 复旦大学 Method for conducting modification of surface hydroxy group of carbon nanotube
CN104030634A (en) * 2014-06-12 2014-09-10 杭州固华复合材料科技有限公司 High-strength and high-toughness reactive powder concrete of carbon doped nano-tube and preparation method of high-strength and high-toughness reactive powder concrete
CN106396555A (en) * 2016-09-08 2017-02-15 东南大学 Cellulose fiber internal curing-based ultra-high-performance cement-based composite material and preparation method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1843904A (en) * 2006-03-30 2006-10-11 复旦大学 Method for conducting modification of surface hydroxy group of carbon nanotube
CN104030634A (en) * 2014-06-12 2014-09-10 杭州固华复合材料科技有限公司 High-strength and high-toughness reactive powder concrete of carbon doped nano-tube and preparation method of high-strength and high-toughness reactive powder concrete
CN106396555A (en) * 2016-09-08 2017-02-15 东南大学 Cellulose fiber internal curing-based ultra-high-performance cement-based composite material and preparation method thereof

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
中华人民共和国建设部: "《普通混凝土力学性能试验方法标准 GB/T50081-2002》", 30 April 2003, 中国建筑工业出版社 *

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110407536A (en) * 2019-07-31 2019-11-05 大连理工大学 A kind of carbon nanotube composite high-performance concrete having impact resistance
CN113024212A (en) * 2020-09-23 2021-06-25 西安建筑科技大学 High-tenacity high-cohesiveness C140-strength high-strength fiber concrete and preparation method thereof
CN112329219A (en) * 2020-10-26 2021-02-05 中国科学院力学研究所 Method for calculating tensile damage area of rock containing micropores and microcracks in Brazilian splitting experiment
CN112329219B (en) * 2020-10-26 2024-01-26 中国科学院力学研究所 Method for calculating tensile damage area of rock containing micropores and microcracks in Brazilian split experiment
CN113816695A (en) * 2021-10-26 2021-12-21 西安建筑科技大学 Carbon nanotube modified concrete and preparation method and application thereof
CN114014610A (en) * 2021-11-25 2022-02-08 华南理工大学 Carbon fiber reinforced ultra-high performance concrete and preparation method thereof

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