CN110510942A - A kind of preparation method of high strength structure stable type foamed concrete material - Google Patents
A kind of preparation method of high strength structure stable type foamed concrete material Download PDFInfo
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- CN110510942A CN110510942A CN201910710792.4A CN201910710792A CN110510942A CN 110510942 A CN110510942 A CN 110510942A CN 201910710792 A CN201910710792 A CN 201910710792A CN 110510942 A CN110510942 A CN 110510942A
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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
- 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
- C04B14/38—Fibrous materials; Whiskers
- C04B14/386—Carbon
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
- C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
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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
- 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
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention relates to a kind of preparation methods of high strength structure stable type foamed concrete material, belong to concrete material technical field.Technical solution of the present invention uses the synergistic effect of itself reduction effect and forming core inducer of sodium hypophosphite, the hydride of generation is adsorbed in nickel particle surface, it effectively prepares nickel catalyst and catalysis prepares the carbon fibre material of polymorphic structure, so technical solution of the present invention uses carbon aerogel material for reunion carrier, the excellent specific surface area and structural form having by carbon aerogel material, pass through the Carbon fibe material of load, aerogel material forms the packing material with a plurality of " tentacle " structure in foamed cement hole, between such material and material, pass through the set and entanglement between " tentacle ", the effective three-dimensional structure to interweave is formed on spatial position, it is effectively improved the binding performance of material to a certain extent, keep its structure even closer.
Description
Technical field
The present invention relates to a kind of preparation methods of high strength structure stable type foamed concrete material, belong to concrete material skill
Art field.
Background technique
The trend increased year by year is presented in the building energy consumption in China, accounts for about the 30% of national energy total flow, therefore for energy
Source, resource scarcity China, building energy conservation is particularly significant and necessary.Universal new building insulation material can not only be saved largely
The energy, and considerable economic benefit can be obtained, it is the effective way for realizing building energy conservation.The Chinese government and society are continuous at present
Pay attention to New Building Materials development and application, your kind effort promote materials for wall reform and Building Energy Conservation Policy, development have energy conservation,
Benefit is useless, heat preservation, light body, it is heat-insulated the advantages that New Building Materials can gradually become new trend.Thermal insulating material in construction market
Material, can be divided into organic insulation material and inorganic heat insulation material by material type.Compared with organic insulation material, inorganic heat preservation material
Material has outstanding advantages of high-strength, safe, durable, and thermal insulation property is also continuously improved.The most common inorganic heat insulation material is with silicon
Acid salt cement is foam concrete made of matrix.Compared with portland cement, with the alumina-silicas raw material such as metakaolin, flyash
The geo-polymer prepared under the conditions of alkali-activated carbonatite is a kind of novel green inorganic coagulation material, system extensive with raw material sources
Standby simple process, process green and the advantages that intensity is high, corrosion-resistant, high temperature resistant, are widely studied in recent years.With the modern times
The rapid advances of science and technology and economic fast development, the demand of cement concrete sharply increase, and bring many rings
The problem of border protection and sustainable development.It is estimated that one will be discharged into atmosphere while one ton of portland cement of every production
The carbon dioxide of ton.This not only serious ground contamination atmosphere, also result in and aggravate the generation of so-called greenhouse effects, make global ring
Border worsening, air temperature warming, sea level rise and the frequent generation of major natural disasters, causes the direct losses that the world is annual
Up to more than $ 100 billion.If not paid attention to this and searching out effective measures solving, it will to the existence of the mankind
The consequence of bringing on a disaster property of condition.Since the environment of human survival is worsening, the use environment of building is also increasingly severe, special
It is not to be wanted as the production of the mankind and living space gradually develop to Earth and deep-sea to the concrete durability of building
Ask higher and higher.And use the building of traditional portland concrete because of endurance issues, usually using the service life 50~
100 years or so.So the continuous production of traditional portland is increasing to carrying capacity of environment for the survival of mankind, drawback
Also it is completely exposed.
Using cement-based gelling material, admixture etc. as main cementitious material, material is made by the way that additive and water is added
Slurry, can also be added partial particulate shape aglite and slurry is made, by foaming agent foam, contain made of pouring molding, maintenance
Having lightweight concrete material that is a large amount of, small, independent, being uniformly distributed bubble is foam concrete.Traditional foam
Concrete is foaming agent to be prepared into foam with the method for physical blowing, then foam is added to cement-based gelling material, is mixed
It closes in slurry made of material, additive and water, and pouring molding, conserves.Foam concrete is mainly the following classification.
It can be divided by cementitious material type: cement, gypsum, alkali-activated slag foam concrete；It is divided into according to the difference of bulk density: heat preservation,
Load-bearing, load-bearing and insulating foam concrete；It can be divided by foam pattern: foaming agent physical blowing, inflation, chemical blowing, stirring
Foaming；It can be divided by aggregate type: granular polystyrene, expanded perlite, haydite, expanded slag etc.；It can be divided by production technology: work
Factory is prefabricated, cast in situs；It can be divided by application field: garden landscape, special engineering, industrial, environment-friendly engineering foam concrete.
The simple production process of foam concrete has many advantages, such as light, insulation, antidetonation, sound-proof refractory.It is mixed to prepare foam
There are mainly two types of the methods for coagulating soil: one is concrete slurry and foaming agent to be placed in agitated kettle simultaneously, being stirred preparation
Method；Another kind is first by the prefabricated method for being then added to progress mix in the concrete slurry mixed of foam.And two
The difference of person essentially consists in the addition sequence of foam.In general, preformed foam mixing method is for pumping at a distance, using mixed
Carrying out slurry prepared by conjunction paddling process cannot be used for pumping and cast in situs.
SiO2Aeroge is a kind of nano-porous materials, has the super thermal insulation separation thermal property of Ultralight, is current quality
Solid material most light, heat-proof quality is best, is added 30vol% aeroge in concrete preparation process, and thermal coefficient can be with
Reduce 31%.Document also indicates that aeroge is added in concrete can be effectively reduced dry density and thermal coefficient.Since foam contains
Foam concrete mouldability is difficult to ensure when measuring excessive, therefore, it is difficult to increase merely, and prepares aeroge by the way that aeroge is added
Concrete reduces its density and thermal coefficient, and it is limited to there is a problem of that excessively high cost, density and thermal coefficient reduce, so how
The structural behaviour for improving foamed concrete material after aeroge adds, is that the main of technical solution of the present invention solves the problems, such as.
Summary of the invention
The technical problems to be solved by the invention: it is difficult to merely for current foamed concrete material addition aerogel material
Increase, and prepare aeroge concrete by addition aeroge and reduce its density and thermal coefficient, excessively high, density that there are costs and
Thermal coefficient reduces limited problem, while directly addition aerogel material leads to foamed concrete material structure defective tightness
Problem provides a kind of preparation method of high strength structure stable type foamed concrete material.
In order to solve the above technical problems, the technical solution adopted by the present invention is that:
(1) according to parts by weight, 45~50 parts of deionized waters, 3~5 parts of nickel sulfates, 10~15 parts of sodium hypophosphites are weighed respectively
Solution and 1~2 part of polyvinylpyrrolidone are placed in conical flask, are stirred and ultrasonic disperse, collection dispersion slurries are simultaneously protected
Temperature reaction, obtains heat preservation dispersion liquid, adjusts pH to 12.0, obtains alkaline solution and sodium borohydride solution is added dropwise in alkaline solution, wait drip
It after the completion of adding, filters and washs, dry, be ground up, sieved, obtain catalytic modification particle；
(2) catalytic modification particle and thiophene are stirred and are placed in three-necked flask, be stirred and lead to by 1:15 in mass ratio
Nitrogen excludes air, after the completion of being passed through, heating heating, insulation reaction and to reaction gas is passed through in three-necked flask, wait be passed through
After the completion, it heating up again, insulation reaction, stopping is passed through reaction gas and continuing and is passed through nitrogen to being cooled to room temperature, grinding distribution,
It must disperse special-shaped carbon nano-fiber material；
(3) according to parts by weight, 45~50 parts of deionized waters, 10~15 parts of nano-celluloses and 3~5 parts of polyethylene are weighed respectively
Alcoholic solution is placed in a beaker, and is stirred simultaneously vacuum freeze drying, is obtained matrix aerogel material, matrix aerogel material is placed in
In tube-type atmosphere furnace, leads to nitrogen and exclude air, heating heating keeps the temperature charing, and standing is cooled to room temperature, and obtains matrix carbon gels material
Material；
(4) according to parts by weight, 45~50 parts of carbon matrix gel rubber materials, 25~30 parts of dehydrated alcohols and 10~15 parts are weighed respectively
Disperse special-shaped carbon nano-fiber material to be placed in mortar, grinding distribution simultaneously collects discrete particles, then 1:15 in mass ratio, by quality
5% poly-vinyl alcohol solution of score and discrete particles, which are stirred, is placed at 45~50 DEG C dry 6~8h, grinds to obtain modified powder
End；
(5) according to parts by weight, 45~50 parts of cement, 25~30 parts of water, 6~8 parts of grinding modified powders and 6~8 are weighed respectively
Part 8% poly-vinyl alcohol solution of mass fraction is placed in blender, is stirred and is collected to obtain cementitious composite slurry, in mass ratio 1:
40, foaming agent and cementitious composite slurry mixs and are placed in foaming agent, is stirred and processing of foaming, collects to foam slurries simultaneously
It is poured into mold, stand foaming is simultaneously sealed with preservative film, is stood, is conserved demoulding and can be prepared into the high strength structure and stablize
Type foamed concrete material.
It is acetylene that the reaction gas, which is in volume is passed through: hydrogen: the gas for the ratio mixing that nitrogen is 1:3:1.
It is 100mL/min that the reaction gas, which is passed through rate,.
The sodium borohydride solution drop rate is 0.1mL/s.
It is 25~30mL/min that the nitrogen, which is passed through rate,.
The heating heating, insulation reaction are to be warming up to 650~700 DEG C by 5 DEG C/min, insulation reaction.
The heating heating, heat preservation charcoal, which is turned to, is warming up to 850~900 DEG C by 3 DEG C/min, 2~3h of heat preservation charing.
The sodium borohydride solution dripping quantity is 1:15 in mass ratio, and 10g/L sodium borohydride solution is added dropwise to alkalization
Liquid.
The maintenance demoulding is that demoulding is handled after standard curing method conserves 28 days.
The foaming agent is preferably FP-180 type animal protein foaming agent.
The present invention is compared with other methods, and advantageous effects are:
(1) synergistic effect of the technical solution of the present invention using itself reduction effect and forming core inducer of sodium hypophosphite, phosphoric acid
In the nickel particle surface meeting catalytic dehydrogenation for having catalytic capability, the hydride of generation is adsorbed in nickel particle surface, while generating just
Ecological atom, nickel ion and phosphate radical have catalysis reduction in nascent state atom pair solution, effectively prepare nickel catalyst
And catalysis prepares the carbon fibre material of polymorphic structure, since acetylene is cracked into carbon atom, in catalyst particle surface absorption, expands
It dissipates, under the action of co-catalyst thiophene, forms surface as the liquid-like phase crystal grain of nickel system, due to the anisotropy between crystal face,
The speed of growth is different, thus root carbon fiber crimped in the opposite direction on catalysis crystal grain it is helically shaped, due to coiled carbon fibers
It is the carbon fiber with similar DNA double-spiral structure either Microspring structure, coiled carbon fibers are in addition to straight fibre
Outside the excellent properties such as density is low, specific strength is high, chemical stability, heat resistance, it is good that special helical structure also has material
Good electric property, good mechanical property and electromaganic wave absorbing property, while its large specific surface area, draw ratio are big, fiber it
Between be easy to happen mutually winding and lead to agglomeration, so technical solution of the present invention use carbon aerogel material be reunion load
Body, the excellent specific surface area and structural form having by carbon aerogel material, the carbon fibre material of helical structure are effectively filled out
It is charged in gel rubber material hole, the carbon fibre material filled by hole, is effectively improved its agglomeration and by fiber and gas
The combination of gel rubber material further improves the mechanical property and architectural characteristic of material, passes through the Carbon fibe material of load, gas
Gel rubber material forms the packing material with a plurality of " tentacle " structure in foamed cement hole, such material and material it
Between, by the set and entanglement between " tentacle ", the effective three-dimensional structure to interweave is formed on spatial position, makes it in stress
While with effect, suffered strength is effectively unloaded and dispersed, the mechanical strength of material is further increased, meanwhile,
Effective entanglement between material, the resulting structure of formation are effectively improved the binding performance of material to a certain extent, make its structure
It is even closer；
(2) technical solution of the present invention it is modified using aeroge and it is compound be added to inside foamed concrete material, material is effectively reduced
The density and thermal coefficient of material are cement of the heat in solid first due to transmitting of the heat in aerogel foam concrete
Transmitting in skeleton, secondly the transmitting in nanometer porous aeroge, is finally to transmit in the air that stomata is wrapped, adds
Entering aeroge can be effectively reduced the thermal coefficient of foam concrete, reduces Material cladding density, further improves foam coagulation
Soil material performance improves its use scope.
Specific embodiment
According to parts by weight, 45~50 parts of deionized waters, 3~5 parts of nickel sulfates, 10~15 parts of mass fractions are weighed respectively
5% ortho phosphorous acid sodium solution and 1~2 part of polyvinylpyrrolidone are placed in conical flask, are stirred and are placed in 200~300W
10~15min of lower ultrasonic disperse collects dispersion slurries and is placed in 25~30min of insulation reaction at 35~45 DEG C, must keep the temperature dispersion
Heat preservation dispersion liquid 1% ammonium hydroxide of mass fraction is adjusted pH to 12.0, alkaline solution and in mass ratio 1:15 is obtained, by 10g/L boron by liquid
Sodium hydride solution is added dropwise in alkaline solution, and control drop rate is that 0.1mL/s is filtered after being added dropwise to complete and used deionized water
Flushing is in neutrality to cleaning solution, and ground 200 mesh of vacuum freeze drying obtains catalytic modification particle；1:15 in mass ratio will be urged
Change modified particles and thiophene is stirred and is placed in three-necked flask, be stirred and lead to nitrogen exclusion air, control nitrogen is logical
Entering rate is 25~30mL/min, after the completion of being passed through, is warming up to 650~700 DEG C by 5 DEG C/min, insulation reaction and to three mouthfuls
Reaction gas is passed through in flask, it is 100mL/min that control, which is passed through rate, after the completion of being passed through, is warming up to 800 DEG C again, heat preservation
After reacting 1~2h, stopping is passed through reaction gas and continues to be passed through nitrogen to being cooled to room temperature, and grinding distribution must disperse abnormity and receive
Rice carbon fibre material；According to parts by weight, 45~50 parts of deionized waters, 10~15 parts of nano-celluloses and 3~5 parts are weighed respectively
5% poly-vinyl alcohol solution of mass fraction is placed in a beaker, and is stirred simultaneously vacuum freeze drying, is obtained matrix aerogel material, will
Matrix aerogel material is placed in tube-type atmosphere furnace, is led to nitrogen and is excluded air, is warming up to 850~900 DEG C by 3 DEG C/min, heat preservation
After carbonizing 2~3h, standing is cooled to room temperature, and obtains carbon matrix gel rubber material；According to parts by weight, 45~50 parts of matrixes are weighed respectively
Carbon gels material, 25~30 parts of dehydrated alcohols and the special-shaped carbon nano-fiber material of 10~15 parts of dispersions are placed in mortar, grinding point
Discrete particles, then 1:15 in mass ratio are dissipated and collected, 5% poly-vinyl alcohol solution of mass fraction and discrete particles are stirred simultaneously
It is placed at 45~50 DEG C dry 6~8h, grinds to obtain modified powder；According to parts by weight, respectively weigh 45~50 parts of cement, 25~
30 parts of water, 6~8 parts of grinding modified powders and 6~8 parts of 8% poly-vinyl alcohol solutions of mass fraction are placed in blender, are stirred
And cementitious composite slurry is collected to obtain, foaming agent is mixed with cementitious composite slurry and is placed in foaming agent by 1:40 in mass ratio, and stirring is mixed
Merge foaming processing, collect to foam slurries and be poured into mold, stand foaming is simultaneously sealed with preservative film, stands 3~5 days
Afterwards, demoulding can be prepared into the high strength structure stable type foamed concrete material after standard curing 28 days.
Example 1
According to parts by weight, 45 parts of deionized waters, 3 parts of nickel sulfates, 10 parts of 5% ortho phosphorous acid sodium solutions of mass fraction are weighed respectively
It is placed in conical flask with 1 part of polyvinylpyrrolidone, is stirred and is placed in ultrasonic disperse 10min under 200W, collect dispersion
Slurries are placed in insulation reaction 25min at 35 DEG C, obtain heat preservation dispersion liquid, and heat preservation dispersion liquid 1% ammonium hydroxide of mass fraction is adjusted
PH to 12.0 obtains alkaline solution and in mass ratio 1:15, and 10g/L sodium borohydride solution is added dropwise in alkaline solution, and speed is added dropwise in control
Rate is 0.1mL/s, after being added dropwise to complete, filters and is rinsed with deionized water to cleaning solution and be in neutrality, vacuum freeze drying grinding
200 meshes are crossed, catalytic modification particle is obtained；Catalytic modification particle and thiophene are stirred and are placed in three mouthfuls by 1:15 in mass ratio
In flask, it is stirred and leads to nitrogen exclusion air, it is 25mL/min that control nitrogen, which is passed through rate, after the completion of being passed through, by 5
DEG C/min is warming up to 650 DEG C, insulation reaction and to reaction gas is passed through in three-necked flask, it is 100mL/min that control, which is passed through rate,
After the completion of being passed through, it is warming up to 800 DEG C again, after insulation reaction 1h, stopping is passed through reaction gas and continuing and is passed through nitrogen to cold
But to room temperature, grinding distribution must disperse special-shaped carbon nano-fiber material；According to parts by weight, respectively weigh 45 parts of deionized waters,
10 parts of nano-celluloses and 3 parts of 5% poly-vinyl alcohol solutions of mass fraction are placed in a beaker, and are stirred simultaneously vacuum freeze drying,
Matrix aerogel material is obtained, matrix aerogel material is placed in tube-type atmosphere furnace, leads to nitrogen and excludes air, by 3 DEG C/min liter
Temperature is to 850 DEG C, and after heat preservation charing 2h, standing is cooled to room temperature, and obtains carbon matrix gel rubber material；According to parts by weight, it weighs respectively
45 parts of carbon matrix gel rubber materials, 25 parts of dehydrated alcohols and the special-shaped carbon nano-fiber material of 10 parts of dispersions are placed in mortar, grinding point
Discrete particles, then 1:15 in mass ratio are dissipated and collected, 5% poly-vinyl alcohol solution of mass fraction and discrete particles are stirred simultaneously
It is placed at 45 DEG C dry 6h, grinds to obtain modified powder；According to parts by weight, 45 parts of cement, 25 parts of water, 6 parts of grindings are weighed respectively
Modified powder and 6 parts of 8% poly-vinyl alcohol solutions of mass fraction are placed in blender, are stirred and collect to obtain cementitious composite slurry,
Foaming agent and cementitious composite slurry are mixed and are placed in foaming agent by 1:40 in mass ratio, are stirred and processing of foaming, and are collected
Foaming slurries are simultaneously poured into mold, and stand foaming is simultaneously sealed with preservative film, and after standing 3 days, demoulding is after standard curing 28 days
The high strength structure stable type foamed concrete material can be prepared into.
Example 2
According to parts by weight, 47 parts of deionized waters, 4 parts of nickel sulfates, 12 parts of 5% ortho phosphorous acid sodium solutions of mass fraction are weighed respectively
It is placed in conical flask with 2 parts of polyvinylpyrrolidones, is stirred and is placed in ultrasonic disperse 12min under 250W, collect dispersion
Slurries are placed in insulation reaction 27min at 37 DEG C, obtain heat preservation dispersion liquid, and heat preservation dispersion liquid 1% ammonium hydroxide of mass fraction is adjusted
PH to 12.0 obtains alkaline solution and in mass ratio 1:15, and 10g/L sodium borohydride solution is added dropwise in alkaline solution, and speed is added dropwise in control
Rate is 0.1mL/s, after being added dropwise to complete, filters and is rinsed with deionized water to cleaning solution and be in neutrality, vacuum freeze drying grinding
200 meshes are crossed, catalytic modification particle is obtained；Catalytic modification particle and thiophene are stirred and are placed in three mouthfuls by 1:15 in mass ratio
In flask, it is stirred and leads to nitrogen exclusion air, it is 27mL/min that control nitrogen, which is passed through rate, after the completion of being passed through, by 5
DEG C/min is warming up to 675 DEG C, insulation reaction and to reaction gas is passed through in three-necked flask, it is 100mL/min that control, which is passed through rate,
After the completion of being passed through, it is warming up to 800 DEG C again, after insulation reaction 1h, stopping is passed through reaction gas and continuing and is passed through nitrogen to cold
But to room temperature, grinding distribution must disperse special-shaped carbon nano-fiber material；According to parts by weight, respectively weigh 47 parts of deionized waters,
12 parts of nano-celluloses and 4 parts of 5% poly-vinyl alcohol solutions of mass fraction are placed in a beaker, and are stirred simultaneously vacuum freeze drying,
Matrix aerogel material is obtained, matrix aerogel material is placed in tube-type atmosphere furnace, leads to nitrogen and excludes air, by 3 DEG C/min liter
Temperature is to 875 DEG C, and after heat preservation charing 2h, standing is cooled to room temperature, and obtains carbon matrix gel rubber material；According to parts by weight, it weighs respectively
47 parts of carbon matrix gel rubber materials, 27 parts of dehydrated alcohols and the special-shaped carbon nano-fiber material of 12 parts of dispersions are placed in mortar, grinding point
Discrete particles, then 1:15 in mass ratio are dissipated and collected, 5% poly-vinyl alcohol solution of mass fraction and discrete particles are stirred simultaneously
It is placed at 47 DEG C dry 7h, grinds to obtain modified powder；According to parts by weight, 47 parts of cement, 27 parts of water, 7 parts of grindings are weighed respectively
Modified powder and 7 parts of 8% poly-vinyl alcohol solutions of mass fraction are placed in blender, are stirred and collect to obtain cementitious composite slurry,
Foaming agent and cementitious composite slurry are mixed and are placed in foaming agent by 1:40 in mass ratio, are stirred and processing of foaming, and are collected
Foaming slurries are simultaneously poured into mold, and stand foaming is simultaneously sealed with preservative film, and after standing 4 days, demoulding is after standard curing 28 days
The high strength structure stable type foamed concrete material can be prepared into.
Example 3
According to parts by weight, 50 parts of deionized waters, 5 parts of nickel sulfates, 15 parts of 5% ortho phosphorous acid sodium solutions of mass fraction are weighed respectively
It is placed in conical flask with 2 parts of polyvinylpyrrolidones, is stirred and is placed in ultrasonic disperse 15min under 300W, collect dispersion
Slurries are placed in insulation reaction 30min at 45 DEG C, obtain heat preservation dispersion liquid, and heat preservation dispersion liquid 1% ammonium hydroxide of mass fraction is adjusted
PH to 12.0 obtains alkaline solution and in mass ratio 1:15, and 10g/L sodium borohydride solution is added dropwise in alkaline solution, and speed is added dropwise in control
Rate is 0.1mL/s, after being added dropwise to complete, filters and is rinsed with deionized water to cleaning solution and be in neutrality, vacuum freeze drying grinding
200 meshes are crossed, catalytic modification particle is obtained；Catalytic modification particle and thiophene are stirred and are placed in three mouthfuls by 1:15 in mass ratio
In flask, it is stirred and leads to nitrogen exclusion air, it is 30mL/min that control nitrogen, which is passed through rate, after the completion of being passed through, by 5
DEG C/min is warming up to 700 DEG C, insulation reaction and to reaction gas is passed through in three-necked flask, it is 100mL/min that control, which is passed through rate,
After the completion of being passed through, it is warming up to 800 DEG C again, after insulation reaction 2h, stopping is passed through reaction gas and continuing and is passed through nitrogen to cold
But to room temperature, grinding distribution must disperse special-shaped carbon nano-fiber material；According to parts by weight, respectively weigh 50 parts of deionized waters,
15 parts of nano-celluloses and 5 parts of 5% poly-vinyl alcohol solutions of mass fraction are placed in a beaker, and are stirred simultaneously vacuum freeze drying,
Matrix aerogel material is obtained, matrix aerogel material is placed in tube-type atmosphere furnace, leads to nitrogen and excludes air, by 3 DEG C/min liter
Temperature is to 900 DEG C, and after heat preservation charing 3h, standing is cooled to room temperature, and obtains carbon matrix gel rubber material；According to parts by weight, it weighs respectively
50 parts of carbon matrix gel rubber materials, 30 parts of dehydrated alcohols and the special-shaped carbon nano-fiber material of 15 parts of dispersions are placed in mortar, grinding point
Discrete particles, then 1:15 in mass ratio are dissipated and collected, 5% poly-vinyl alcohol solution of mass fraction and discrete particles are stirred simultaneously
It is placed at 50 DEG C dry 8h, grinds to obtain modified powder；According to parts by weight, 50 parts of cement, 30 parts of water, 8 parts of grindings are weighed respectively
Modified powder and 8 parts of 8% poly-vinyl alcohol solutions of mass fraction are placed in blender, are stirred and collect to obtain cementitious composite slurry,
Foaming agent and cementitious composite slurry are mixed and are placed in foaming agent by 1:40 in mass ratio, are stirred and processing of foaming, and are collected
Foaming slurries are simultaneously poured into mold, and stand foaming is simultaneously sealed with preservative film, and after standing 5 days, demoulding is after standard curing 28 days
The high strength structure stable type foamed concrete material can be prepared into.
Example 1,2,3 prepared by the present invention is detected, according to " foam concrete " professional standard (JG/T266-
2011) it requires to carry out dry density measurement to cellular concrete product, takes one group of test specimen, survey axial dimension by length, accurately
To 1mm, and the volume V of every piece of test specimen is calculated, drying to constant weight in drying box by 3 pieces of test specimens, and examination is measured after being cooled to room temperature
Part quality, is accurate to 1g.
Example 1,2,3 prepared by the present invention is detected, according to " foam concrete " professional standard (JG/T266-
2011) it requires to carry out water absorption rate measurement to cellular concrete product: test specimen is dried to permanent quality in electric drying oven with forced convection；When
After test specimen is cooled to room temperature, puts it into the thermostatic water bath that water temperature is (20 ± 5) DEG C, add water at the 1/3 of height of specimen, to
It is added water to the 2/3 of height of specimen afterwards for 24 hours, after keeping for 24 hours, water is added to be higher by test specimen 30mm or more, kept for 24 hours, by test specimen
It is taken out from water, erases surface moisture with wet cloth, and measure its every piece quality immediately.
Example 1,2,3 prepared by the present invention is detected, according to " foam concrete " professional standard (JG/T 266-
2011) it requires to carry out intensity test to cellular concrete product；
The test specimen having a size of 300 × 300 × 30 mm sizes, which is made, after maintenance to predetermined age in foam concrete first to try
Part is put into electric drying oven with forced convection and dries to constant weight, and takes out test block and is cooled to room temperature, then carries out on thermal conductivity measuring apparatus
Measured Results of Thermal Conductivity.
Specific testing result such as following table table 1:
1 properties of product of table characterize table
| Performance characterization | Example 1 | Example 2 | Example 3 |
| Compression strength/MPa | 2.82 | 2.86 | 2.89 |
| Water absorption rate/% | 32.54 | 32.12 | 31.89 |
| Absolute Dry Density/kg/m3 | 725 | 721 | 720 |
| Thermal coefficient/W/ (m*k) | 0.151 | 0.151 | 0.151 |
| Density/kg/m3 | 282.6 | 283.5 | 284.1 |
Concrete prepared by the present invention has excellent mechanical property intensity as shown in Table 1.
Claims (10)
1. a kind of preparation method of high strength structure stable type foamed concrete material, it is characterised in that specific preparation step are as follows:
(1) according to parts by weight, 45~50 parts of deionized waters, 3~5 parts of nickel sulfates, 10~15 parts of sodium hypophosphites are weighed respectively
Solution and 1~2 part of polyvinylpyrrolidone are placed in conical flask, are stirred and ultrasonic disperse, collection dispersion slurries are simultaneously protected
Temperature reaction, obtains heat preservation dispersion liquid, adjusts pH to 12.0, obtains alkaline solution and sodium borohydride solution is added dropwise in alkaline solution, wait drip
It after the completion of adding, filters and washs, dry, be ground up, sieved, obtain catalytic modification particle；
(2) catalytic modification particle and thiophene are stirred and are placed in three-necked flask, be stirred and lead to by 1:15 in mass ratio
Nitrogen excludes air, after the completion of being passed through, heating heating, insulation reaction and to reaction gas is passed through in three-necked flask, wait be passed through
After the completion, it heating up again, insulation reaction, stopping is passed through reaction gas and continuing and is passed through nitrogen to being cooled to room temperature, grinding distribution,
It must disperse special-shaped carbon nano-fiber material；
(3) according to parts by weight, 45~50 parts of deionized waters, 10~15 parts of nano-celluloses and 3~5 parts of polyethylene are weighed respectively
Alcoholic solution is placed in a beaker, and is stirred simultaneously vacuum freeze drying, is obtained matrix aerogel material, matrix aerogel material is placed in
In tube-type atmosphere furnace, leads to nitrogen and exclude air, heating heating keeps the temperature charing, and standing is cooled to room temperature, and obtains matrix carbon gels material
Material；
(4) according to parts by weight, 45~50 parts of carbon matrix gel rubber materials, 25~30 parts of dehydrated alcohols and 10~15 parts are weighed respectively
Disperse special-shaped carbon nano-fiber material to be placed in mortar, grinding distribution simultaneously collects discrete particles, then 1:15 in mass ratio, by quality
5% poly-vinyl alcohol solution of score and discrete particles, which are stirred, is placed at 45~50 DEG C dry 6~8h, grinds to obtain modified powder
End；
(5) according to parts by weight, 45~50 parts of cement, 25~30 parts of water, 6~8 parts of grinding modified powders and 6~8 are weighed respectively
Part 8% poly-vinyl alcohol solution of mass fraction is placed in blender, is stirred and is collected to obtain cementitious composite slurry, in mass ratio 1:
40, foaming agent and cementitious composite slurry mixs and are placed in foaming agent, is stirred and processing of foaming, collects to foam slurries simultaneously
It is poured into mold, stand foaming is simultaneously sealed with preservative film, is stood, is conserved demoulding and can be prepared into the high strength structure and stablize
Type foamed concrete material.
2. a kind of preparation method of high strength structure stable type foamed concrete material according to claim 1, feature exist
In: it is acetylene that the reaction gas, which is in volume is passed through: hydrogen: the gas for the ratio mixing that nitrogen is 1:3:1.
3. a kind of preparation method of high strength structure stable type foamed concrete material according to claim 1, feature exist
In: it is 100mL/min that the reaction gas, which is passed through rate,.
4. a kind of preparation method of high strength structure stable type foamed concrete material according to claim 1, feature exist
In: the sodium borohydride solution drop rate is 0.1mL/s.
5. a kind of preparation method of high strength structure stable type foamed concrete material according to claim 1, feature exist
In: it is 25~30mL/min that the nitrogen, which is passed through rate,.
6. a kind of preparation method of high strength structure stable type foamed concrete material according to claim 1, feature exist
In: the heating heating, insulation reaction are to be warming up to 650~700 DEG C by 5 DEG C/min, insulation reaction.
7. a kind of preparation method of high strength structure stable type foamed concrete material according to claim 1, feature exist
In: the heating heating, heat preservation charcoal, which is turned to, is warming up to 850~900 DEG C by 3 DEG C/min, 2~3h of heat preservation charing.
8. a kind of preparation method of high strength structure stable type foamed concrete material according to claim 1, feature exist
In: the sodium borohydride solution dripping quantity is 1:15 in mass ratio, and 10g/L sodium borohydride solution is added dropwise to alkaline solution.
9. a kind of preparation method of high strength structure stable type foamed concrete material according to claim 1, feature exist
In: the maintenance demoulding is that demoulding is handled after standard curing method conserves 28 days.
10. a kind of preparation method of high strength structure stable type foamed concrete material according to claim 1, feature exist
In: the foaming agent is preferably FP-180 type animal protein foaming agent.
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| CN112919924A (en) * | 2021-04-12 | 2021-06-08 | 陈长国 | High-strength lightweight concrete and preparation method thereof |
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Application publication date: 20191129 |