CN108863133A - A kind of efficient special fibre antimitotic agent and preparation method thereof - Google Patents
A kind of efficient special fibre antimitotic agent and preparation method thereof Download PDFInfo
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- CN108863133A CN108863133A CN201810818081.4A CN201810818081A CN108863133A CN 108863133 A CN108863133 A CN 108863133A CN 201810818081 A CN201810818081 A CN 201810818081A CN 108863133 A CN108863133 A CN 108863133A
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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
- 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
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- 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
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/027—Lightweight materials
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a kind of efficient special fibre antimitotic agents and preparation method thereof.The special fibre antimitotic agent is to use heat of hydration suppressive swelling agent and fiber composite, gives full play to the synergistic effect of the two, effectively reduces the temperature shrinkage in concrete hydrating hardening process and dry contraction, improves the cracking resistance of concrete.
Description
Technical field
The invention belongs to construction material technical field of concrete additives, more particularly to a kind of efficient special fibre cracking resistance
Agent and preparation method thereof.
Background technique
With the enhancing of infrastructure construction in china, mass concrete using more and more extensive, but concrete cracking
Problem is also increasingly severe, and the cracking of concrete will lead to structural strength, durability and volume stability and reduce, thus effectively
The concrete cracking that prevents or reduces be a problem to be solved.
The reason of causing the cracking of concrete mainly has two aspects：First is that the volume contraction in concrete hydrating hardening process
Caused by contraction distortion, be on the other hand then that volume contraction can be such that internal tensile stress increases, when internal tensile stress is more than concrete
Ultimate tensile strength when, can also make concrete cracking.
A certain amount of swelling agent is added in concrete, certain compensating action is had to the contraction of concrete, but for temperature
Degree crack cannot effectively control.Heat of hydration suppressive swelling agent can effectively slow down hydration heat rate, continue swelling agent
Expansion is played, temperature shrinkage is reduced, thus heat of hydration suppressive swelling agent can be effectively reduced the dry shrinkage and cracking of concrete.
The anti-crack resistance of fiber is big, elasticity modulus is high, and the tensile strength and deformability of concrete, enhancing can be improved after addition concrete
The toughness of concrete.
Concrete generally will affect the durable of concrete structure because crack is a kind of common quality defect caused by shrinking
Property.Wherein, it is dry shrink (including self-desiccation shrinkage) and temperature shrinkage (contraction distortion due to caused by the heat of hydration) be two kinds most
Concrete structure early-age crack phenomenon caused by main contraction, especially temperature shrinkage is more prevalent.By years of researches
And practice, people explore from different angles such as technique, materials reduces both technological approaches shunk.
Swelling agent be to resist concrete drying shrinkage and a kind of widely used concrete admixture of temperature shrinkage, it is related
The technical literature and patent document of swelling agent are as follows：
" swelling agent and expansive concrete " (" electrification " CSA100R, swelling agent and expansive concrete [J], Japan Electric are chemical
Industrial Co., Ltd, the 4th phase in 2008,16-24 pages) report a kind of heat of hydration suppressive that Japan Electric chemical company produces
Cement expansive material CSA100R, component include 2%-4%SiO2,9%-12%Al2O3,1% or less Fe2O3,45%-
52%CaO, 2% or less MgO, 24%-30%SO3.The swelling agent be developed on the basis of CSA swelling agent can reduce coagulation
Soil temperature liter inhibits the swelling agent of thermal cracking, but does not illustrate to act the material composition for inhibiting aquation heat effect in swelling agent.
The European patent document of Publication No. EP1233008A1 discloses a kind of " cement additive and cement admixture ",
Be by calcium oxide, gypsum, calcium ferrite or (and) swelling agents of the mineral compositions such as calcium aluminoferrite.Prepare the grinding process of the swelling agent
In be added to dextrin, in order to inhibit the heat of hydration, reduce the thermal deformation due to caused by the heat of hydration.
The Chinese patent literature of Publication No. CN102674738A discloses the preparation of " a kind of Multifunctional anti-crack additive "
Method is by calcium oxide expansive clinker 25%-40%, dextrin 1%-3%, and surplus is flyash, and wherein dextrin is commercially available work
Industry product, specific surface area >=200m2/kg, partial size < 0.315mm, solubility 20%-80%, calcium oxide expansive clinker and fine coal
It is 200-400m2/kg that ashes, which is milled to specific surface area, and by the material after grinding and according to the ratio, weighed dextrin is uniformly mixed i.e. thereafter
Multifunctional anti-crack additive is obtained, the Cracking Temperature of concrete can be reduced.But the technology is without the raw material of just synthesis dextrin
Heat of hydration inhibitory effect is described in detail with technique, is analyzed, and the Multifunctional anti-crack additive has (1) limitation expansion
Rate is small (0.0452%), and (2) also need adding coal ash due to adding coal ash in formula in use process, increases production
The shortcomings that product transportation cost.
Construction material for the purpose of to compensate shrinkage, the representative are：(1) with granulated blast-furnace slag for main group
Point, the low heat micro expanding cement of appropriate Portland clinker and gypsum, (such as existing national standards are added《Low-heat micro-expansion water
Mud》Cement as defined in GB2938), such cement has that expansion performance is low, early strength is low.(2) it controls in cement
Content of magnesia 4%-5%, and the thus derivative swelling agent etc. containing magnesia, such as Publication No. CN101143769A
One kind disclosed in Chinese patent literature " three expansion source concrete anti-cracking agent (CMA) ", the China of Publication No. CN1412144A are special
One disclosed in one kind disclosed in sharp document " magnesium oxide composite expanding agent ", the Chinese patent literature of Publication No. CN101456694A
Kind " durable type three-expansion source cement expansive material ", there are firing temperature and hydration reaction are uppity for magnesia class swelling agent
Problem, so it is restricted in the application of building engineering field.
In terms of reducing concrete temperature contraction, such as reduction cement consumption, the admixture fine coal taken in addition to process aspect
The low activities such as ash, slag powders, gangue supplementary cementitious material, reduction concrete molding temperature, logical cooling water pipe cooling etc. are outer, mix
Add cement retarder etc., is in addition exactly the special additive that addition reduces hydration heat of cement, such as：Publication No. CN1108226A's
Chinese patent literature discloses " a kind of additive and its preparation process for reducing hydration heat of concrete ", is using 60-70 weight
Part water and the calcium chloride heating stirring of the iron chloride of 8-l5 parts by weight, 20-28 parts by weight be made A liquid, then by 55-70 parts by weight
Water and the hexakis-methoxy methyl ultrapas of 0.2-0.7 parts by weight, the sodium alkyl benzene sulfonate of 2-9 parts by weight, 25-50 parts by weight
B liquid is made in methylene tomb sodium dinaphthalenesulfonate heating stirring, finally by two kinds of liquid of A, B according to 1:It is small that 2-6 is mixed in 1-1.5 room temperature
When, the additive for reducing hydration heat of concrete is made；The Chinese patent literature of Publication No. CN1810703A discloses a kind of " mixed
The preparation method of solidifying soil hydration reducer ", being will be selected from polyacrylic acid-Starch graft copolymer coal-water, polyglycolic acid-lactic acid copolymerization
One of object, modified starch, poly- ammonium formate, poly-methyl methacrylate vinegar, polyacrylonitrile alkyl vinegar and ethyl cellulose raw material
Dissolved with water, 5-55 DEG C react, by after reaction water phase and solid phase separate, the solid phase isolated is concrete hydrating
Hot depressant.Due to using effect and practicability etc. are uncertain, both materials for reducing the heat of hydration do not obtain so far
It is widely applied.
It refers to using maltodextrin in addition, having been reported that as cement concrete retarder, it may have reduce cement concrete
Heat of hydration temperature peak value, the effect for postponing warm peak generation time, it is identical as the effect of general retarder is used, but it is this as slow
The dextrin or reduction concrete temperature rise effect is limited or setting time is too long that solidifying agent uses, practicability is poor.
In the technology for reducing concrete drying shrinkage, improvement swelling agent using effect, interior maintaining process is a kind of important
Technological means.Using conserving material in high hydroscopic resin or haydite etc., the moisture absorbed in advance is discharged, can not only be alleviated mixed
The dry of solidifying soil is shunk, and is able to ascend cement expansive material using effect.Related reduction concrete drying shrinkage, improvement are swollen
The patent document of swollen dose of using effect is as follows：
The Chinese patent literature of Publication No. CN101863072A discloses " a kind of to promote high-strength slightly expanded concrete performance
Interior maintaining process ", be that cementitious material, swelling agent and super-strong moisture absorbing resin is added simultaneously while being stirred sand and stone
Hereafter water and water-reducing agent is added in stirring 30 seconds, stir 120 seconds after-pourings, and the volume range of super-strong moisture absorbing resin is cementitious material
With the 0.15%-0.30% of swelling agent gross mass, the super-strong moisture absorbing resin of incorporation, 80-120 μm of partial size, super-strong moisture absorbing resin
Water absorption rate is at 150-300 times, and the suction salting liquid ability of super-strong moisture absorbing resin is at 15-40 times.Technology presence cannot reduce coagulation
The shortcomings that native heat of hydration temperature rise.
The Chinese patent literature of Publication No. 201110026838.4 discloses a kind of " volume stabilizer of cement-based material
And its application method ", this volume stabilizer is characterized in：Shrinkage type slump retaining agent 30%-60%, swelling agent 0-70%, it is interior to support
Shield agent is 0-70%, and wherein swelling agent is calcium sulphoaluminate class cement expansive material, calcium oxide cement expansive material, magnesia coagulation
Any one in soil expansion agent, iron powder series concrete swelling agent or composite expanding agent.Interior curing agent is artificial synthesized inorganic interior
Curing agent or the mineral that naturally absorb water (such as bentonite, active attapulgite and active gangue) material.Technology presence cannot drop
Low concrete heat of hydration temperature rise disadvantage.
The Chinese patent literature of Publication No. CN102173629A disclose " a kind of internal curing material of high-performance concrete and
Preparation method ", this internal curing material of high-performance concrete are made of following components and content (mass parts)：Swelling agent
100, organic high water absorption material 1.0-5.0, inorganic water-absorbent material 0-50, water-retaining agent 0-1.0, filler 0-10.Swelling agent is sulphur
The mixture of any one or more in aluminate type, oxidation magnesium types and calcium oxide type swelling agent；Inorganic water-absorbent material be shale,
Granular solid matter made of one of flyash and other materials with gelling property or a variety of firings；Water-retaining agent is hydroxypropyl
The mixture of one or both of methylcellulose, methylcellulose；Organic water-absorbent material by 1wt%-10wt% acrylic acid,
10wt%-30wt% acrylamide, the sodium hydroxide solution that 25wt%-40wt% mass concentration is 25%, 10wt%-30wt%
After the initiator that the crosslinking agent and 10wt%-30wt% mass concentration that mass concentration is 0.1% are 0.5% reacts jointly, through drying
The acrylic acid/acrylamide copolymer that dry, crushing and sieving obtain.By the swelling agent of aforementioned proportion, organic high water absorption material, nothing
Machine water-absorbent material, water-retaining agent and filler successively put into dry powder mixer, through mechanical mixture for a period of time to uniform, obtain high property
Conserving material in energy concrete.The technology is in the presence of the shortcomings that cannot reducing hydration heat of concrete temperature rise.
(light-weight aggregate shrinks coagulation to compensation to document " gain effect of the light-weight aggregate to expansive concrete limited expansion rate "
The gain effect of native limited expansion rate, swelling agent and expansive concrete [J], Zhao Shunzeng, Liu Li, the 4th phase in 2008,1-4 pages) it grinds
The water absorption rate and light-weight aggregate volume for having studied carefully different cultivars light-weight aggregate are to the expansive concrete limited expansion rate for adding swelling agent
Gain effect.The result shows that add cement expansive material expansive concrete in add part satisfy water light-weight aggregate into
Maintenance in row can generate apparent gain effect to its limited expansion rate.
In the above-described techniques, the part for being related to cement expansive material is all the expansion used with calcium oxide for main expansion sources
Agent.This kind of swelling agent hydration rate is fast, and early expansion is rapid, and largely consumption is in the concrete temperature rise period for expansion energy, and cool down rank
Section is poor to the compensation ability of concrete shrinkage.
It is being related to the part of heat of hydration inhibition material, such as the Chinese patent of Publication No. CN1108226A and CN1810703A
Material disclosed in document is not used widely so far, and effect lacks practical proof.Dextrin is that one kind is obtained by starch gelatinization
The product arrived, variety of raw material, preparation process etc. have very big influence to hydration heat of cement inhibitory effect and setting time,
Lack effective experimental study in detail in this respect.
The patent of notification number CN103342494B takes the interior curing agent triple combination of swelling agent-hydration inhibitors-to make
Method realizes the inhibition heat of hydration by the combination of three, enhances the effect of strength of cement, but its higher cost, and
Complex process.
Be related to the part of interior conserving material, there are haydite etc. water suction light-weight aggregate it is inconvenient to use, need pre- soaking in advance
Full water；High hydroscopic resin material absorption salt, the ability of aqueous alkali are poor, and it is big that Water absorption reduces amplitude.In addition, in cement etc.
Under viscous medium package, absorption speed is slack-off, will lead to the problems such as chutable concrete slump-loss increases.
The prior art inhibits the heat of hydration of concrete using Starch Hydrolysis, but has in product after Starch Hydrolysis certain
The small molecular sugar of amount, this part sugar much benefits generally no to the reduction of hydrated cementitious peak heat release rates only can obviously prolong
The setting time of long cement needs to be added ethyl alcohol and goes out useless part to reduce and eliminate the influence of small molecular sugar, increases
Cost.
Existing antimitotic agent is usually to consider from one side, improves the cracking of concrete by the way that swelling agent or fiber is added
Problem, it is in view of the defects existing in the prior art and insufficient, it is an object of the invention to propose a kind of efficient special fibre antimitotic agent,
Not only the tensile strength of concrete can also can be improved with effective compensation concrete shrinkage, improve the durability of concrete, improve mixed
Coagulate the cracking resistance of soil.
Summary of the invention
In response to the problems existing in the prior art, the purpose of the present invention is to provide a kind of efficient special fibre antimitotic agent and its systems
Preparation Method.
To achieve the above object, the technical solution adopted by the present invention is that：
A kind of efficient special fibre antimitotic agent, is made of the raw material of following mass percent：
Heat of hydration suppressive swelling agent 25wt%-80wt%
Fiber and cornstarch 20wt%-75wt%
The fiber and cornstarch press 1:1 mass percent mixing.
Further, the group of the heat of hydration suppressive swelling agent becomes：
The heat of hydration suppressive expansive clinker of 70wt%-95wt%
The gypsum of 5wt%-30wt%.
Further, the heat of hydration suppressive expansive clinker is sufficiently mixed uniformly by mass percentage by following raw material
After calcine：
Lime stone 70-80wt%
Gypsum 5-10wt%
Scum 3-5wt%
Bauxite 3-5wt%
Metal oxide 0.1-5wt%.
Further, the mineral composition of the heat of hydration suppressive expansive clinker is：
f-CaO：40wt%-75wt%
C4A3S：8wt%-25wt%
C4AF：3wt%-10wt%
C2S：5wt%-25wt%.
Further, the raw material calcination temperature is 1150 DEG C -1350 DEG C.
Further, the fiber is one of basalt fibre, steel fibre and polypropylene fibre or a variety of.
The present invention also describes a kind of preparation method of efficient special fibre antimitotic agent, includes the following steps：
(1) heat of hydration suppressive swelling agent is prepared：Heat of hydration suppressive expansive clinker is mixed with gypsum, intergrinding is extremely
Specific surface area is 150-400m2/ kg obtains heat of hydration suppressive swelling agent；
(2) by cornstarch and deionized water with 2 under stirring:Fiber is added after 1 mass ratio mixing, it is mixed molten
Liquid heats 10-20 minutes in 85 DEG C of constant temperature oil baths, and retrogradation forms gel at room temperature, freezes, and using vacuum drying, is added and mixed
The nickel acetate of cornstarch equivalent is carbonized before closing, and collects charing substance；
(3) charing substance in the step (2) is mixed with heat of hydration suppressive swelling agent, as efficient special fibre is anti-
Split agent.
The three-dimensional netted porous structure to form gel state is pyrolyzed using cornstarch as carbon source, fiber is by gel adsorption packet
It wraps up in, fiber, which is orderly flocked together, increases its cracking resistance, since starch has in carbonization process from foaming behavior, part
Substance is discharged in the form of micro-molecular gas oxygen, hydrogen etc., causes the structure in hole larger, after nickel acetate is added and is catalyzed,
The thermal decomposition product NiO of nickel acetate is reduced into Ni by part small molecular sugar, eliminates this part small molecular sugar to the shadow of cement setting
It rings, while the system volume contraction after charing becomes smaller, and causes the diameter in hole to become smaller even and closes, while increasing specific surface
Product, fiber are not easy to be pulled by gel adsorption package, further increase the cracking resistance of concrete.Cornstarch is adulterated simultaneously
Afterwards, additionally it is possible to reduce hydration heat of concrete temperature rise.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) biggish expansion can be generated during concrete cooling, improved concrete and resisted because cooling down generation
Temperature shrinkage stress, and then improve the anti-crack ability of concrete.
(2) hydration heat of concrete temperature rise can be significantly reduced, reduces concrete because temperature shrinkage caused by temperature increases is split
Seam.
(3) fiber is wrapped up agglomerated together by three-dimensional netted porous structure, and closing aperture causes its complete ordering poly-
Collection, increases crack-resistant performance of concrete, and when concrete is destroyed, fiber is not pulled directly, is broken, further
Limit the expansion of distress in concrete.
Specific embodiment
Below in conjunction with the embodiment in the present invention, technical solution of the present invention is clearly and completely described, is shown
So, described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on the reality in the present invention
Example is applied, those of ordinary skill in the art's all other embodiment obtained under the conditions of not making creative work all belongs to
In the scope of protection of the invention.
In the present invention, heat of hydration suppressive expansive clinker uses 70-80wt% lime stone, 5-15wt% gypsum, 3-5wt%
Scum, 3-5wt% bauxite and 0.1-5wt% metal oxide intergrinding, are calcined, calcination temperature 1150 in rotary kiln
℃-1350℃.The mineral composition of heat of hydration suppressive expansive clinker is f-CaO：40wt%-75wt%, C4A3S：8wt%-
25wt%, C4AF：3wt%-10wt%, C2S：5wt%-25wt%.
Embodiment 1：
Efficient special fibre antimitotic agent component (by mass) includes in the present embodiment：Heat of hydration inhibition swelling agent
55wt%, basalt fibre 22.5wt%, cornstarch 22.5wt%.
Wherein heat of hydration suppressive expansive clinker is 85wt%, gypsum 15wt% in heat of hydration suppressive swelling agent.
Preparation process is as follows：(1) 78% lime stone, 7% gypsum, 5% scum, 5% bauxite and 5% zinc oxide is common
Grinding, 1300 DEG C of calcinings in rotary kiln, consisting of SiO23.52%, Fe2O31.39%, Al2O35.11%, CaO
76.3%, SO38.03%, MgO 2.38%.
10 μm of basalt fibre nominal diameter therein, nominal length 15mm, density 2.6g/cm3, tensile strength
4000MPa, elasticity modulus 94GPa, elongation at break 2.8%, moisture content 0.06%.
(2) heat of hydration suppressive expansive clinker is mixed with gypsum, intergrinding to specific surface area is 200m2/ kg, obtains
Heat of hydration suppressive swelling agent；
(3) by cornstarch and deionized water with 2 under stirring:Basalt fibre is added after 1 mass ratio mixing, is mixed
Solution afterwards heats 20 minutes in 85 DEG C of constant temperature oil baths, and retrogradation forms gel at room temperature, freezes, and using vacuum drying, is added
It is carbonized with the nickel acetate for mixing preceding cornstarch equivalent, collects charing substance；
(4) charing substance in (3) is mixed with heat of hydration suppressive swelling agent, as efficient special fibre antimitotic agent.
Embodiment 2：
Efficient special fibre antimitotic agent component (by mass) includes in the present embodiment：Heat of hydration inhibition swelling agent
55wt%, basalt fibre 15wt%, steel fibre 7.5wt%, cornstarch 22.5wt%.
Wherein heat of hydration suppressive expansive clinker is 85wt%, gypsum 15wt% in heat of hydration suppressive swelling agent.
Preparation process is as follows：(1) 78% lime stone, 7% gypsum, 5% scum, 5% bauxite and 5% zinc oxide is common
Grinding, 1300 DEG C of calcinings in rotary kiln, consisting of SiO23.52%, Fe2O31.39%, Al2O35.11%, CaO
76.3%, SO38.03%, MgO 2.38%.
10 μm of basalt fibre nominal diameter therein, nominal length 15mm, density 2.6g/cm3, tensile strength
4000MPa, elasticity modulus 94GPa, elongation at break 2.8%, moisture content 0.06%.
Length of steel fiber 20mm, diameter 0.5mm, density 7.8g/cm3, tensile strength >=600MPa, elasticity modulus
20GPa。
(2) heat of hydration suppressive expansive clinker is mixed with gypsum, intergrinding to specific surface area is 200m2/ kg, obtains
Heat of hydration suppressive swelling agent；
(3) by cornstarch and deionized water with 2 under stirring:Basalt fibre and steel are added after 1 mass ratio mixing
Fiber, mixed solution heat 15 minutes in 85 DEG C of constant temperature oil baths, and retrogradation forms gel at room temperature, freezes, using vacuum
It is dry, it is added and is carbonized with the nickel acetate for mixing preceding cornstarch equivalent, collect charing substance；
(4) charing substance in (3) is mixed with heat of hydration suppressive swelling agent, as efficient special fibre antimitotic agent.
Embodiment 3：
Efficient special fibre antimitotic agent component (by mass) includes in the present embodiment：Heat of hydration suppressive swelling agent
55wt%, basalt fibre 15wt%, polypropylene fibre 7.5wt%, cornstarch 22.5wt%.
Wherein heat of hydration suppressive expansive clinker is 85wt%, gypsum 15wt% in heat of hydration suppressive swelling agent.
(1) heat of hydration suppressive expansive clinker is by 78% lime stone, 5% bauxite, 5% scum, 7% gypsum and 5%
Zinc oxide is calcined for 1300 DEG C in rotary kiln, consisting of SiO23.52%, Fe2O31.39%, Al2O35.11%,
CaO 76.3%, SO38.03%, MgO 2.38%.
10 μm of basalt fibre nominal diameter therein, nominal length 15mm, density 2.6g/cm3, tensile strength
4000MPa, elasticity modulus 94GPa, elongation at break 2.8%, moisture content 0.06%.
Polypropylene fibre length 19mm, 4.8 μm of diameter, density 0.91g/cm3, tensile strength >=400MPa.
(2) heat of hydration suppressive expansive clinker is mixed with gypsum, intergrinding to specific surface area is 200m2/ kg, obtains
Heat of hydration suppressive swelling agent；
(3) by cornstarch and deionized water with 2 under stirring:Basalt fibre is added after 1 mass ratio mixing and is gathered
Tacryl, mixed solution heat 15 minutes in 85 DEG C of constant temperature oil baths, and retrogradation forms gel at room temperature, freeze, using
Vacuum drying is added and is carbonized with the nickel acetate for mixing preceding cornstarch equivalent, collects charing substance；
(4) charing substance in (3) is mixed with heat of hydration suppressive swelling agent, as efficient special fibre antimitotic agent.
Concrete formulation for testing example 1~3 uses grade for the formula of C35, cement amount 340kg/m3,
Water-cement ratio is 0.43, and polycarboxylate water-reducer volume is 1% (solid content 10%), and the volume of concrete high-efficiency fibre crack-resistance agent is
34kg/m3, fibre crack-resistance agent and cementitious material, coarse-fine aggregate are first subjected to mix, add water, the mixing time can suitably prolong
It is long.
According to GB 8076-2008《Concrete admixture》The slump for testing concrete, according to GB/T 50081-2002
《Standard for test methods of mechanical properties of ordinary concrete》Concrete crushing strength and flexural strength test block are formed, tested,
Referring to GB 50496-2009《Mass concrete engineering job specfication》Temperature element is selected to test concrete temperature, according to
GB23439-2009《Cement expansive material》Concrete limited expansion rate is tested, according to GB/T 50082-2009《Commonly
Concrete long-term behaviour and endurance quality test method standard》The anti-permeability performance of concrete is tested.
Working performance, temperature rise result, limited expansion rate, compression strength, tensile strength and the impermeability test knot of concrete
Fruit is as follows：
1 working performance of concrete of table and temperature rise
The addition of efficient special fibre antimitotic agent does not generate the working performance of concrete unfavorable as can be seen from Table 1
Influence, and the Wen Fengjun of concrete has an apparent reduction, the time that warm peak occurs also obvious delay, thus to reducing temperature
Shrinking has preferable effect.
2 concrete limited expansion rate of table
From table 2 it can be seen that expansion effect is obvious after incorporation special fibre antimitotic agent of the present invention, and early expansion reduces,
Water support 14d when, still have obvious expansion effect, can effective compensation concrete contraction, prevent the cracking of concrete.
3 concrete strength of table
As shown in Table 3, after mixing the special fibre antimitotic agent, the compression strength and flexural strength of concrete have certain journey
The enhancing of degree, and intensity stabilization develops, when long-age, does not occur retraction phenomenon, this also illustrates concrete to a certain extent
Cracking resistance is improved.
4 agent on crack resistance of concrete cleavage strength of table
As can be seen from Table 4, after efficient special fibre antimitotic agent is added, the jacking strength of concrete, to concrete
Cracking has preferable retardance and effect of contraction, effectively raises the tensile splitting strength of concrete.
The concrete impervious result of table 5
| Project | Blank | Embodiment 1 | Embodiment 2 | Embodiment 3 |
| Seepage-resistant grade | P8 | P10 | P10 | P10 |
As can be seen from Table 5, concrete anticracking grade is added after special fibre antimitotic agent of the present invention, P10 is increased to by P8,
Anti-permeability performance is significantly improved, and effectively improves the durability of concrete.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (7)
1. a kind of efficient special fibre antimitotic agent, which is characterized in that be made of the raw material of following mass percent：
Heat of hydration suppressive swelling agent 25wt%-80wt%
Fiber and cornstarch 20wt%-75wt%
The fiber and cornstarch press 1:1 mass percent mixing.
2. a kind of efficient special fibre antimitotic agent according to claim 1, it is characterised in that：The heat of hydration suppressive is swollen
Swollen dose of group becomes：
Heat of hydration suppressive expansive clinker 70wt%-95wt%
Gypsum 5wt%-30wt%.
3. a kind of efficient special fibre antimitotic agent according to claim 2, which is characterized in that the heat of hydration suppressive is swollen
Swollen clinker is calcined after being sufficiently mixed by mass percentage uniformly by following raw material：
Lime stone 70-80wt%
Gypsum 5-15wt%
Scum 3-5wt%
Bauxite 3-5wt%
Metal oxide 0.1-5wt%.
4. a kind of efficient special fibre antimitotic agent according to claim 2, which is characterized in that the heat of hydration suppressive is swollen
The mineral composition of swollen clinker is：
f-CaO：40wt%-75wt%
C4A3S：8wt%-25wt%
C4AF：3wt%-10wt%
C2S：5wt%-25wt%.
5. a kind of efficient special fibre antimitotic agent according to claim 3, which is characterized in that the raw material calcination temperature
It is 1150 DEG C -1350 DEG C.
6. a kind of efficient special fibre antimitotic agent according to claim 1, which is characterized in that the fiber is that basalt is fine
One of dimension, steel fibre and polypropylene fibre are a variety of.
7. a kind of preparation method of efficient special fibre antimitotic agent described in claim 1, which is characterized in that including following step
Suddenly：
(1) heat of hydration suppressive swelling agent is prepared：Heat of hydration suppressive expansive clinker is mixed with gypsum, intergrinding is to than table
Area is 150-400m2/ kg obtains heat of hydration suppressive swelling agent；
(2) by cornstarch and deionized water with 2 under stirring:Fiber is added after 1 mass ratio mixing, mixed solution exists
85 DEG C of constant temperature oil baths heat 10-20 minute, and retrogradation forms gel at room temperature, freeze, using vacuum drying, addition with mix before
The nickel acetate of cornstarch equivalent is carbonized, and charing substance is collected；
(3) charing substance in the step (2) is mixed with heat of hydration suppressive swelling agent, as efficient special fibre cracking resistance
Agent.
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