CN105601152A - Efficient shrinkage-reducing anti-cracking agent and preparation method thereof - Google Patents
Efficient shrinkage-reducing anti-cracking agent and preparation method thereof Download PDFInfo
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- CN105601152A CN105601152A CN201510954471.0A CN201510954471A CN105601152A CN 105601152 A CN105601152 A CN 105601152A CN 201510954471 A CN201510954471 A CN 201510954471A CN 105601152 A CN105601152 A CN 105601152A
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- 238000005336 cracking Methods 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 44
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 239000000843 powder Substances 0.000 claims abstract description 21
- 238000001694 spray drying Methods 0.000 claims abstract description 20
- 239000000292 calcium oxide Substances 0.000 claims abstract description 16
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims abstract description 16
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical group [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 8
- 229920001577 copolymer Polymers 0.000 claims abstract description 8
- 238000006243 chemical reaction Methods 0.000 claims description 15
- 239000002202 Polyethylene glycol Substances 0.000 claims description 11
- 229920001223 polyethylene glycol Polymers 0.000 claims description 11
- 239000007789 gas Substances 0.000 claims description 10
- 238000001035 drying Methods 0.000 claims description 9
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims description 8
- ATVJXMYDOSMEPO-UHFFFAOYSA-N 3-prop-2-enoxyprop-1-ene Chemical compound C=CCOCC=C ATVJXMYDOSMEPO-UHFFFAOYSA-N 0.000 claims description 7
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 7
- 239000000203 mixture Substances 0.000 claims description 6
- 239000000178 monomer Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000000703 high-speed centrifugation Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 claims description 5
- 239000008247 solid mixture Substances 0.000 claims description 5
- 229920002401 polyacrylamide Polymers 0.000 claims description 4
- CVEPFOUZABPRMK-UHFFFAOYSA-N 2-methylprop-2-enoic acid;styrene Chemical compound CC(=C)C(O)=O.C=CC1=CC=CC=C1 CVEPFOUZABPRMK-UHFFFAOYSA-N 0.000 claims description 3
- 239000003513 alkali Substances 0.000 claims description 3
- 125000000956 methoxy group Chemical group [H]C([H])([H])O* 0.000 claims description 3
- -1 persulfuric acid salt Chemical class 0.000 claims description 3
- 229920000570 polyether Polymers 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- 238000006116 polymerization reaction Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 11
- 239000000463 material Substances 0.000 abstract description 6
- 238000006703 hydration reaction Methods 0.000 abstract description 4
- 230000036571 hydration Effects 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 230000006378 damage Effects 0.000 abstract description 2
- 239000011810 insulating material Substances 0.000 abstract 1
- 239000012774 insulation material Substances 0.000 abstract 1
- 230000010354 integration Effects 0.000 abstract 1
- 239000003960 organic solvent Substances 0.000 abstract 1
- 239000004567 concrete Substances 0.000 description 22
- 230000008602 contraction Effects 0.000 description 11
- 239000004568 cement Substances 0.000 description 10
- 238000012360 testing method Methods 0.000 description 9
- 230000008961 swelling Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- 239000011230 binding agent Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000004480 active ingredient Substances 0.000 description 2
- 239000000654 additive Substances 0.000 description 2
- ROOXNKNUYICQNP-UHFFFAOYSA-N ammonium persulfate Chemical compound [NH4+].[NH4+].[O-]S(=O)(=O)OOS([O-])(=O)=O ROOXNKNUYICQNP-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 239000004574 high-performance concrete Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 229920001427 mPEG Polymers 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 241000271510 Agkistrodon contortrix Species 0.000 description 1
- 208000017667 Chronic Disease Diseases 0.000 description 1
- 239000011398 Portland cement Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910001870 ammonium persulfate Inorganic materials 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000005945 translocation Effects 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Classifications
-
- 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
- C04B40/0042—Powdery mixtures
-
- 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
- C04B24/00—Use of organic materials as active ingredients for mortars, concrete or artificial stone, e.g. plasticisers
- C04B24/24—Macromolecular compounds
- C04B24/26—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C04B24/2688—Copolymers containing at least three different monomers
- C04B24/2694—Copolymers containing at least three different monomers containing polyether side chains
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F283/00—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G
- C08F283/06—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals
- C08F283/065—Macromolecular compounds obtained by polymerising monomers on to polymers provided for in subclass C08G on to polyethers, polyoxymethylenes or polyacetals on to unsaturated polyethers, polyoxymethylenes or polyacetals
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention discloses an efficient shrinkage-reducing anti-cracking agent and a preparation method thereof, the efficient shrinkage-reducing anti-cracking agent comprises a shrinkage-reducing component and an expansion component, the shrinkage-reducing component is a shrinkage-reducing agent is a comb-shaped copolymer shrinkage-reducing agent, the expansion component is a calcium oxide type expander, and the mass ratio of the shrinkage-reducing component to the expansion component is 35: 65-45: 55. The shrinkage-reducing component is absorbed on the surface of the expansion component by spray drying, the expansion component is used as an anti-blocking insulating material to achieve fine powder production of the liquid shrinkage-reducing component, the shrinkage-reducing component is used as a waterproof insulation material to delay early hydration of the expansion component, and ultimately coordination and integration of expansion and shrinkage educing is achieved; by powder production and application, injuries of volatile organic solvents on workers during single use of the shrinkage-reducing agent can be avoided, the effective content of the product can be increased, the efficient shrinkage-reducing anti-cracking agent has a significant anti-cracking effect under conditions of low dosage, and helps are provided for expansion of the use range of anti-cracking materials.
Description
Technical field
The present invention relates to a kind of concrete admixture, be specifically related to a kind of efficient reducing and anti-cracking agent and preparation side thereofMethod.
Background technology
Concrete contraction and consequent cracking, be a chronic disease of concrete engineering quality, is also to learnThe problem that art circle and engineering circles are concerned about always. In recent years along with the development of chemical admixture technology, and eachA large amount of uses of kind of ground mineral admixture, taking low water binder ratio and large volume mineral admixture as the present age of feature highPerformance concrete starts to replace gradually the conventional concrete taking high water-cement ratio and high cement consumption as feature, in buildingIn engineering, playing the part of leading role, by a large amount of promoting the use of. Due to the composition of high performance concrete itself withDesign feature is that slurry thickness, good water-retaining property, water translocation are subject to certain limitation, closely knit same of internal structureTime produce self-desiccation, strengthened concrete contraction and cracking risk. The reason that Concrete Engineering Cracks produces veryMany, relate to the links such as material mix proportion, structural design, construction and late maintaining, and these factorsBetween mutually cross influence and effect, what make that Concrete Engineering Cracks control becomes is very complicated. Although at present rightThe existing more consistent understanding of the origin cause of formation in crack, and many opinions and method have been proposed, but do not obtain so far effectivelyControl.
From features such as engineering structure failure damages, crack is the macro manifestations that structural deterioration was lost efficacy, and producesThe mechanism process in crack is except being subject to various load actions affect, and volume contraction is the key that concrete produces crackFactor. Therefore, by which kind of approach reduce concrete contraction, improve cracking of reinforced concrete become currentThe focus of research. The method solving at present has and in the time of concrete-agitating, adds fiber, swelling agent and economization agent etc.,Its object is all to reduce various contraction distortions, but the mechanism of action of various additives and effect all have difference. FiberInterpolation just improved concrete tensile strength, stoped to a certain extent expansion and the extension in crack,Mainly play the effect of dispersion or homogenizing shrinkage stress, can not fundamentally eliminate the generation in crack. Swelling agent isGenerate expansion crystallization by hydration reaction and carry out compensating concrete contraction, although can compensate early-age shrinkage or produce micro-swollenSwollen, but only in the time of suitable volume (8%～12%) just can play suitable compensation effect, meeting when volume is too highCause concrete strength loss large, when volume is less, compensation effect can not be given full play to, and effect of prestressed is poor. ForReach effect of prestressed, swelling agent volume in concrete is generally 8%～12% of binder total amount at present,Bring expensive problem to long-distance transportation, cause the sale radiation length of existing swelling agent limited, be unfavorable for swollenThe application of swollen dose and popularization. The economization agent using both at home and abroad mostly at present is polyethers and polyethers derivative, although energyEnough reduce concrete shrinkage, but mostly be fluid product, active ingredient is few, reach required Reduce shrinkage effect needsHeavy dose is mixed concrete, has so just virtually increased concrete cost and liquid economization agent volatilityGreatly, have a strong impact on the healthy of workman, directly limited its applying at home.
Summary of the invention
The object of the invention is to the deficiency for existing swelling agent and economization agent, provide one efficiently to reduce anti-Split agent and preparation method thereof. Product of the present invention is a kind of powdery organic-inorganic mixture, by expansion component and subtractingThe coordinating and unifying of contracting component can produce obvious effect of prestressed under low-dosage condition, thereby significantly reducesThe production cost of anti-crack concrete, offers help for expanding the anticracking material scope of application.
Above-mentioned purpose of the present invention is achieved in that
A kind of efficient reducing and anti-cracking agent, by reducing component and expansion component forms, described in reduce component be comb type altogetherPolymers class economization agent, expansion component is calcium oxide expansion agents, described in reduce the mass ratio of component and expansion componentFor 35:65～45:55;
Described comb copolymer shrinkage reducing agent is by polyethylene glycol mono allyl ether, methoxy poly (ethylene glycol) metering systemAcid esters, styrene, polyacrylamide are 1～2:1～2:0.5～1:0.5～1 composition by weight ratio.
Preferably, the mean molecule quantity of described comb copolymer shrinkage reducing agent is 40000～60000, and large monomer turnsRate is 90%～95%.
Described calcium oxide expansion agents is commercially available, f-CaO content >=60% in preferred calcium oxide expansion agents,Granularity >=800 order.
The present invention also provides the preparation method of described efficient reducing and anti-cracking agent, comprises the steps:
(1) reduce the preparation of component: by polyethylene glycol mono allyl ether, methoxy poly (ethylene glycol) metering systemAcid esters and styrene be by weight ratio 1～2:1～2:0.5～1 mix, and press polyethylene glycol mono allyl ether andThe mol ratio of hydrogen peroxide is the hydrogen peroxide solution that the ratio of 10:1～5:1 adds 0.1mol/L, reaction start after againPolyacrylamide and persulfuric acid salt initator are added drop-wise to respectively to reaction vessel for 1:0.1～0.5:0.1 by weightIn, time for adding is controlled at 30min～60min, dropwises rear insulation reaction 2h～3h, and insulation reaction finishesAfter add alkali and be neutralized to PH=6.5～7.5, described in obtaining, reduce component; By changing the weight of above-mentioned each monomerCompare or mol ratio and time for adding, can in polymerization reaction system, synthesize the comb of the large monomer conversion of different polyethersType copolymer analog reduces component;
(2) preparation of efficient reducing and anti-cracking agent: the powder that first expansion component is joined to spray drying tower is reinforcedIn device, the compressed air that is 0.3～0.5MPa by pressure is transported to expansion component the top hot blast of drying towerThe front end of distributor, by temperature be the drying tower air intake of 180～200 DEG C at hot-air distributor position by expansion groupDivide rapid draing and be dispersed in thermal current; Open spray drying tower, be warmed up to spray drying tower topWhen charging aperture temperature is 120-130 DEG C, then be transported to spraying by the component of reducing that screw pump makes step (1)In the liquid inlet opening at drying tower top, by the high speed centrifugation atomizing disk of charging aperture, liquid is reduced to component atomizationBecoming liquid-drop diameter is micro-drop of 50～100 microns, simultaneously with hot-air distributor out, be mixed with expansion componentThe micro-drop of high temperature gas flow Fast Heating, in micro-drop, moisture, by high temperature gas flow rapid draing, subtracts in dry runContracting component is adsorbed on the surface of powder expansion component, forms gas-solid mixture, the powder in air-flow is separated,Obtain described efficient reducing and anti-cracking agent finished product.
The present invention, compared with existing product, reducing in the spray-dired process of component, is expanded by introducing powderComponent is as anti-stick isolated material, reduces liquid and reduce the component caking that bond, guarantee liquid in dry runReduce component and can be dried to fine powder material, eliminated the excitant that contains in liquid economization agent, volatile organic moltenAgent, has improved the active ingredient in economization agent. On the other hand, reduce and in component dry run, be adsorbed on expansion groupPoint surface, delayed the early hydration of expansion component, improved the expansion validity of expansion component, this productWhile application in cement concrete, can open by the surface of reducing in component reduction cement concrete hole solutionPower, reduces the driving force that shrinkage stress sends, and can, by the hydration swelling of expansion component, compensate and produce againShrinkage stress, realized and having expanded and the coordinating and unifying of reducing, under low-dosage condition, can obviously promote cementConcrete cracking resistance, offers help for expanding the anticracking material scope of application.
Brief description of the drawings
Fig. 1 is the embodiment of the present invention and the dry shrinkage curve figure of comparative example in cement paste.
Fig. 2 is the embodiment of the present invention and the self-constriction curve map of comparative example in cement paste.
Detailed description of the invention
For a better understanding of the present invention, when the following example, further illustrate of the present invention, should notBe considered to any type of restriction of the present invention.
One, reduce the preparation of component
By 2 parts of polyethylene glycol mono allyl ethers, 2 parts of methoxy polyethylene glycol methacrylate-styrene polymers and 1 part of benzene secondAlkene adds in reactor after mixing, and the ratio that is 5:1 by polyethylene glycol mono allyl ether and the mol ratio of hydrogen peroxideExample adds the hydrogen peroxide solution proportion ingredient of 0.1mol/L, temperature of reaction kettle is warming up to 65 DEG C, then by 0.5Part polyacrylamide and 0.1 part of ammonium persulfate initiator are added dropwise in reactor simultaneously, separately drip, when droppingBetween be 60min, dropwise rear insulation reaction 3h, reaction finish after, add alkali and be neutralized to pH=7.1, obtainSolid content is 46.3% shallow milky transparency liquid, and molecular weight is 49000, and large monomer conversion is 91.2%Liquid reduce component A.
Two, the preparation of the efficient reducing and anti-cracking agent of powder
Embodiment 1
Getting 65 parts of f-CaO content is 65%, and granularity is that the commercially available calcium oxide expansion agents of 900 object is as expansionComponent joins in the powder feeder of spray drying tower, passes into pressure and be the gas of 0.5MPa by expansion componentBe transported to the front end of the top hot-air distributor of drying tower, the hot blast that passes into temperature and be 190 DEG C is fast by expansion componentRapid-curing cutback is dry and be dispersed in thermal current. Open spray drying tower, be warmed up to the charging at spray drying tower topWhen mouthful temperature is 120 DEG C, then with screw pump, 35 parts of aforesaid liquids is reduced to component and be transported to spray drying tower topIn the liquid inlet opening of portion, by the high speed centrifugation atomizing disk of liquid inlet opening, liquid is reduced to component and be atomized into liquidDripping diameter is micro-drop of 50～100 microns, simultaneously with hot-air distributor height out, that be mixed with expansion componentThe micro-drop of warm air Fast Heating, in micro-drop, moisture, by high temperature gas flow rapid draing, reduces group in dry runDivide the surface that is adsorbed on powder expansion component, form gas-solid mixture, after cooling, the powder in air-flow is isolatedCome, obtain the efficient reducing and anti-cracking agent finished product KLJ-1 of a kind of fine-powdered of the present invention.
Embodiment 2
Getting 60 parts of f-CaO content is 65%, and granularity is that the commercially available calcium oxide expansion agents of 900 object is as expansionComponent joins in the powder feeder of spray drying tower, passes into pressure and be the gas of 0.4MPa by expansion componentBe transported to the front end of the top hot-air distributor of drying tower, the hot blast that passes into temperature and be 180 DEG C is fast by expansion componentRapid-curing cutback is dry and be dispersed in thermal current. Open spray drying tower, be warmed up to the charging at spray drying tower topWhen mouthful temperature is 125 DEG C, then with screw pump, 40 parts of aforesaid liquids is reduced to component and be transported to spray drying tower topIn the liquid inlet opening of portion, by the high speed centrifugation atomizing disk of liquid inlet opening, liquid is reduced to component and be atomized into liquidDripping diameter is micro-drop of 50～100 microns, simultaneously with hot-air distributor height out, that be mixed with expansion componentThe micro-drop of warm air Fast Heating, in micro-drop, moisture, by high temperature gas flow rapid draing, reduces group in dry runDivide the surface that is adsorbed on powder expansion component, form gas-solid mixture, after cooling, the powder in air-flow is isolatedCome, obtain the efficient reducing and anti-cracking agent finished product KLJ-2 of a kind of fine-powdered of the present invention.
Embodiment 3
Getting 55 parts of f-CaO content is 65%, and granularity is that the commercially available calcium oxide expansion agents of 900 object is as expansionComponent joins in the powder feeder of spray drying tower, passes into pressure and be the gas of 0.3MPa by expansion componentBe transported to the front end of the top hot-air distributor of drying tower, the hot blast that passes into temperature and be 200 DEG C is fast by expansion componentRapid-curing cutback is dry and be dispersed in thermal current. Open spray drying tower, be warmed up to the charging at spray drying tower topWhen mouthful temperature is 130 DEG C, then with screw pump, 45 parts of aforesaid liquids is reduced to component and be transported to spray drying tower topIn the liquid inlet opening of portion, by the high speed centrifugation atomizing disk of liquid inlet opening, liquid is reduced to component and be atomized into liquidDripping diameter is micro-drop of 50～100 microns, simultaneously with hot-air distributor height out, that be mixed with expansion componentThe micro-drop of warm air Fast Heating, in micro-drop, moisture, by high temperature gas flow rapid draing, reduces group in dry runDivide the surface that is adsorbed on powder expansion component, form gas-solid mixture, after cooling, the powder in air-flow is isolatedCome, obtain the efficient reducing and anti-cracking agent finished product KLJ-3 of a kind of fine-powdered of the present invention.
P II 52.5 portland cements that adopt the south of the River-little Ye field Cement Co., Ltd to produce, fixing water-cement ratioBe 0.35, the efficient reducing and anti-cracking agent of fine-powdered KLJ-1, KLJ-2, KLJ-3 that the present invention is made, Yi JibuSuddenly the dry front independent liquid of not spraying that (one) makes reduces component A and f-CaO content is 65%,Granularity be the commercially available calcium oxide expansion agents of 900 object as powder expansion component B by 2% of binder total amountMix in cement paste, the cement paste benchmark sample blank of not mixing additive represents. AdoptThe prism test specimen of 25mm × 25mm × 280mm, the embedding copperhead in two ends. Specimen molding covers with rear surfacePVC plastic sheeting, under (20 ± 1) DEG C environment, form removal after standard curing (24 ± 2) h, measures each examination after 1hThe initial length of part, is then divided into test specimen 2 groups, and respectively maintenance under dry environment condition and sealing waterproofUnder environmental condition, to test dry contraction and the Self-Shrinkage Property of concrete paste specimen. Wherein, first group of test specimenPlacing is directly (20 ± 1) DEG C in temperature, and in the environment of relative humidity (60 ± 5) %, maintenance is to specifying the length of time and measuringIts drying shrinkage deformation rate; Second group of test specimen is first wound around test specimen surface with preservative film, then wraps up with tack aluminium foilSealing, is then placed on sealed test piece temperature for (20 ± 1) DEG C, and relative humidity is the environmental condition of (60 ± 5) %Lower maintenance is to specifying to test its self-constriction deformation rate the length of time. Contraction distortion rate all represents by linear deformation rate, whereinOn the occasion of representing that concrete paste specimen has produced dilatancy, negative value represents that concrete paste specimen has produced contraction and becomeShape, result of the test is as shown in Fig. 1 (dry contraction) and 2 (self-constrictions).
Result shows, under identical low-dosage condition, mixes the efficient reducing and anti-cracking agent of powdery that the present invention makesConcrete paste specimen can not only significantly reduce dry contraction, and can eliminate water completely under waterproof air-proof conditionThe early stage self-constriction of the clean slurry of mud, produces self-expanding energy, and the later stage without obvious falling, and admixture liquid reduces separatelyAlthough component A and powder expansion component B also can reduce, cement paste is dry to be shunk and self-constriction, reduces effectFruit is starkly lower than the present invention. Visible, the present invention the makes efficient reducing and anti-cracking agent of powdery tool under low-dosage conditionThere is significant reducing and anti-cracking effect.
Claims (4)
1. an efficient reducing and anti-cracking agent, it is characterized in that: by reducing component and expansion component forms, the described component of reducing is comb copolymer shrinkage reducing agent, and expansion component is calcium oxide expansion agents, described in reduce component and expansion component mass ratio be 35:65 ~ 45:55;
Described comb copolymer shrinkage reducing agent is that 1 ~ 2:1 ~ 2:0.5 ~ 1:0.5 ~ 1 forms by polyethylene glycol mono allyl ether, methoxy polyethylene glycol methacrylate-styrene polymer, styrene, polyacrylamide by weight ratio.
2. the efficient reducing and anti-cracking agent of one according to claim 1, is characterized in that, the mean molecule quantity of described comb copolymer shrinkage reducing agent is 40000 ~ 60000, and large monomer conversion is 90% ~ 95%.
3. the efficient reducing and anti-cracking agent of one according to claim 1, is characterized in that, f-CaO content >=60%, granularity >=800 order in described calcium oxide expansion agents.
4. the preparation method of a kind of efficient reducing and anti-cracking agent described in claims 1 to 3 any one, is characterized in that, comprises the steps:
(1) reduce the preparation of component: by polyethylene glycol mono allyl ether, methoxy polyethylene glycol methacrylate-styrene polymer and styrene are that mix 1 ~ 2:1 ~ 2:0.5 ~ 1 by weight ratio, and the ratio that is 10:1 ~ 5:1 in the mol ratio of polyethylene glycol mono allyl ether and hydrogen peroxide adds the hydrogen peroxide solution of 0.1mol/L, after starting, reaction again polyacrylamide and persulfuric acid salt initator are added drop-wise to respectively in reaction vessel for 1:0.1 ~ 0.5:0.1 by weight, time for adding is controlled at 30min ~ 60min, dropwise rear insulation reaction 2h ~ 3h, after insulation reaction finishes, add alkali and be neutralized to PH=6.5 ~ 7.5, described in obtaining, reduce component, by changing weight ratio or mol ratio and the time for adding of above-mentioned each monomer, can in polymerization reaction system, synthesize the comb copolymer class of the large monomer conversion of different polyethers and reduce component,
(2) preparation of efficient reducing and anti-cracking agent: first expansion component is joined in the powder feeder of spray drying tower, the compressed air that is 0.3 ~ 0.5MPa by pressure is transported to expansion component the front end of the top hot-air distributor of drying tower, by temperature be the drying tower air intake of 180 ~ 200 DEG C at hot-air distributor position by expansion component rapid draing and be dispersed in thermal current, open spray drying tower, when the charging aperture temperature that is warmed up to spray drying tower top is 120-130 DEG C, what with screw pump, step (1) is made reduces in the liquid inlet opening that component is transported to spray drying tower top again, liquid is reduced component by high speed centrifugation atomizing disk by charging aperture, and to be atomized into liquid-drop diameter be micro-drop of 50 ~ 100 microns, simultaneously with hot-air distributor out, be mixed with the micro-drop of high temperature gas flow Fast Heating of expansion component, in micro-drop, moisture is by high temperature gas flow rapid draing, in dry run, reduce component and be adsorbed on the surface of powder expansion component, form gas-solid mixture, powder in air-flow is separated, obtain described efficient reducing and anti-cracking agent finished product.
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