CN107459299A - A kind of preparation method of frost-resistant concrete - Google Patents

A kind of preparation method of frost-resistant concrete Download PDF

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Publication number
CN107459299A
CN107459299A CN201710663884.2A CN201710663884A CN107459299A CN 107459299 A CN107459299 A CN 107459299A CN 201710663884 A CN201710663884 A CN 201710663884A CN 107459299 A CN107459299 A CN 107459299A
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coarse aggregate
cement
cobalt oxide
fine aggregate
parts
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Inventor
吴东海
庄迪
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Xinyi Chino New Mstar Technology Ltd
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Xinyi Chino New Mstar Technology Ltd
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Priority to CN201710663884.2A priority Critical patent/CN107459299A/en
Publication of CN107459299A publication Critical patent/CN107459299A/en
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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
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/023—Chemical treatment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/02—Treatment
    • C04B20/04—Heat treatment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10—Coating or impregnating
    • C04B20/1018—Coating or impregnating with organic materials
    • C04B20/1029—Macromolecular compounds
    • C04B20/1033—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
    • C04B20/10—Coating or impregnating
    • C04B20/1018—Coating or impregnating with organic materials
    • C04B20/1029—Macromolecular compounds
    • C04B20/1037—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • 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
    • C04B22/00—Use of inorganic materials as active ingredients for mortars, concrete or artificial stone, e.g. accelerators, shrinkage compensating agents
    • C04B22/06—Oxides, Hydroxides

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention discloses a kind of preparation method of frost-resistant concrete, with cobalt oxide, P.O42.5R type cement, coarse aggregate, fine aggregate, triterpenoid saponin air entraining agent, the raw materials such as efficient naphthalene water reducer pass through freeze proof processing, Multistep feeding, magnetic field processing, the methods of pouring synthesis addition modified Nano material oxidation cobalt frost-resistant concrete.The present invention is by coarse aggregate, fine aggregate carries out freeze proof pretreatment, its anti-freezing property can be lifted, substep, which adds cement, can make cement uniform fold to coarse aggregate, toughness with improving concrete in fine aggregate etc., in the synergy that can be improved between raising cryoprotective effects, and enhancing each several part by adding nano level modified cobalt oxide.

Description

A kind of preparation method of frost-resistant concrete
Technical field
The present invention relates to a kind of preparation method for adding modified Nano material oxidation cobalt frost-resistant concrete, belongs to concrete neck Domain.
Background technology
Common lasting hazard mainly have distress in concrete, carbonization, freeze-thaw damage, steel bar corrosion, water quality corrode, seepage and Corrosion etc., wherein more obvious with freeze-thaw damage.In addition to steel bar corrosion, freeze-thaw damage is exactly that concrete durability destroys Most important reason.Freeze-thaw damage is the caused destruction because of Frozen-thawed cycled when concrete is in water-saturated state, and frost resistance is Refer to the ability of concrete resistance freeze-thaw damage.The anti-freezing property of concrete is to working in the road, bridge, concrete for hydraulic structure in field Durability be particularly important.
The content of the invention
In view of the above-mentioned problems of the prior art, the present invention provides a kind of preparation method of frost-resistant concrete, this method Simply, obtained concrete antifreezing effect is good.
To achieve these goals, the technical solution adopted by the present invention is a kind of preparation method of frost-resistant concrete.Including Following steps：
Step 1, coarse aggregate inserted in sealing container, be evacuated to negative pressure 0.05MPa with vavuum pump, then injected into container POLYPROPYLENE GLYCOL emulsion, POLYPROPYLENE GLYCOL emulsion content are 60% (quality), keep standing 5h under the condition of negative pressure of stabilization, after standing Coarse aggregate fish for and conserved 3 days under the conditions of relative humidity 50 ± 5%, 25 ± 2 DEG C of temperature, obtain freeze proof pretreatment coarse aggregate；
Step 2, fine aggregate is added in roller agitator, the mixed solution of polyethylene glycol and propenyl added, in NH3 Stir process 2h under atmosphere, relative humidity 40 ± 5% is then rested on, conserves 2 days, obtains freeze proof pre- under the conditions of 20 ± 2 DEG C of temperature Handle fine aggregate
Step 3, by the coarse aggregate pre-processed and fine aggregate under high speed agitator be well mixed, then immersion 0.5mol/ 5h under LKCl solution, then coarse aggregate and fine aggregate are poured into processing 60min is crossed in woven bag, then stewing process；
In step 4 and then the coarse aggregate and fine aggregate mixture of handling triterpenoid saponin air entraining agent and running water addition well, quickly Stir process makes it well mixed obtain preliminary solidifying slurry thing；
Step 5 and then the cement of 50% (percentage by weight of the total dosage of cement) is added in above-mentioned preliminary solidifying slurry, stirring 5 ~20 minutes, making cement, preliminary solidifying slurry thing and water form the extraordinary slurry of mobility, play lubrication, are advantageous to stir, And it can guarantee that porosity；
Step 6 and then the cement of remaining 50% (percentage by weight of the total dosage of cement) is added in above-mentioned slurry, Ran Houzai Running water is added, efficient naphthalene water reducer, stirs 15~20 minutes, in the presence of mechanical agitation, is uniformly wrapped in coarse aggregate, The surface of fine aggregate, strengthened its surface Van der Waals force, while also further enhance its toughness, be advantageous to improve freeze proof effect Fruit；
Step 7, cobalt oxide is pre-processed, be fed first into 5% sodium hydroxide solution, then in additional magnetic fields Lower immersion 2h;
Step 8 and then in 0.2mol/LMgCl2Solution under wash away 10-15 times repeatedly, then in air dry oven at drying Manage 2h;
Step 9, calcination processing is finally carried out, the cobalt oxide handled well is transferred in Muffle furnace：First in N2Under atmosphere 0.5kpa, 300 DEG C of calcining 3h, then in air atmosphere, 0.4kpa350 DEG C of calcination processing 4h, finally gives nano level modified Cobalt oxide；
Step 10, obtained nano level modified cobalt oxide is added in above-mentioned solidifying slurry, quickly stirred；
Step 11, moulding by casting is carried out, precuring, be stripped, maintenance, product finally gives addition modified Nano material oxidation cobalt and resisted Freeze concrete.
Beneficial effect:A kind of preparation method for adding modified Nano material oxidation cobalt frost-resistant concrete of the present invention.By right Coarse aggregate, fine aggregate carry out freeze proof pretreatment, its anti-freezing property can be lifted, and substep, which adds cement, can make cement equal It is even to cover coarse aggregate, toughness with improving concrete in fine aggregate etc., it can enter by adding nano level modified cobalt oxide Step improves the synergy between cryoprotective effects, and enhancing each several part.Wherein embodiment 1 produces cobalt oxide, coarse aggregate, thin collection Material, cement 3:60:30:750 sample（Unit serving）, 3 parts of cobalt oxide, 60 parts of coarse aggregate, 30 parts of fine aggregate, 750 parts of cement.100 Part POLYPROPYLENE GLYCOL emulsion, 20 parts of polyethylene glycol, 20 parts of propenyls, 5 parts of triterpenoid saponin air entraining agents, 1000 parts of running water, 10 parts of height Imitate naphthalene water reducer.Embodiment 2 produces cobalt oxide, coarse aggregate, fine aggregate, cement 8:40:60:700 sample（Unit serving）, oxidation 8 parts of cobalt, 40 parts of coarse aggregate, 60 parts of fine aggregate, 700 parts of cement.Other raw material dosages, operating procedure is as embodiment 1.It is made Addition modified Nano material oxidation cobalt frost-resistant concrete cryoprotective effects it is best.
Embodiment
Embodiment 1 produces cobalt oxide, coarse aggregate, fine aggregate, cement 3:60:30:750 sample（Unit serving）, cobalt oxide 3 Part, 60 parts of coarse aggregate, 30 parts of fine aggregate, 750 parts of cement.100 parts of POLYPROPYLENE GLYCOL emulsions, 20 parts of polyethylene glycol, 20 parts of propenyls, 5 parts of triterpenoid saponin air entraining agents, 1000 parts of running water, 10 parts of efficient naphthalene water reducers.
Step 1,60 parts of coarse aggregates are inserted in sealing container, negative pressure 0.05MPa is evacuated to vavuum pump, then to appearance 100 parts of POLYPROPYLENE GLYCOL emulsions are injected in device, POLYPROPYLENE GLYCOL emulsion content is 60% (quality), keeps quiet under the condition of negative pressure of stabilization 5h is put, the coarse aggregate after standing is fished for and conserved 3 days under the conditions of relative humidity 50 ± 5%, 25 ± 2 DEG C of temperature, is obtained freeze proof pre- Handle coarse aggregate；
Step 2,30 parts of fine aggregates are added in roller agitator, are adding mixing for 20 parts of polyethylene glycol and 20 parts of propenyls Solution is closed, in NH3Stir process 2h under atmosphere, relative humidity 40 ± 5% is then rested on, 2 are conserved under the conditions of 20 ± 2 DEG C of temperature My god, obtain freeze proof pretreatment fine aggregate
Step 3, by the coarse aggregate pre-processed and fine aggregate under high speed agitator be well mixed, then immersion 0.5mol/L KCl solution under 5h, then coarse aggregate and fine aggregate are poured into processing 60min, then stewing process are crossed in woven bag；
Step 4 and then handle 5 parts of triterpenoid saponin air entraining agents with 200 parts of running water additions well coarse aggregate and fine aggregate mix In thing, quick stir process makes it well mixed obtain preliminary solidifying slurry thing；
Step 5 and then the cement of 50% (percentage by weight of 750 parts of the total dosage of cement) is added in above-mentioned preliminary solidifying slurry, Stirring 5~20 minutes, makes cement, and preliminary solidifying slurry thing and water form the extraordinary slurry of mobility, play lubrication, are advantageous to Stirring, and can guarantee that porosity；
Step 6 and then the cement of remaining 50% (percentage by weight of 750 parts of the total dosage of cement) is added in above-mentioned slurry, Then 800 parts of running water are added, 10 parts of efficient naphthalene water reducers stir 15~20 minutes, in the presence of mechanical agitation, It is even to be wrapped in coarse aggregate, the surface of fine aggregate, strengthened its surface Van der Waals force, while its toughness is also further enhanced, Be advantageous to improve cryoprotective effects；
Step 7,3 parts of cobalt oxides are pre-processed, be fed first into 5% sodium hydroxide solution, then made in externally-applied magnetic field With lower immersion 2h;
Step 8 and then the MgCl in 0.2mol/L2Solution under wash away 10-15 times repeatedly, then in air dry oven dry Handle 2h;
Step 9, calcination processing is finally carried out, the cobalt oxide handled well is transferred in Muffle furnace：First in N2Under atmosphere 0.5kpa, 300 DEG C of calcining 3h, then in air atmosphere, 0.4kpa350 DEG C of calcination processing 4h, finally gives nano level modified Cobalt oxide；
Step 10, obtained nano level modified cobalt oxide is added in above-mentioned solidifying slurry, quickly stirred；
Step 11, moulding by casting is carried out, precuring, be stripped, maintenance, product finally gives addition modified Nano material oxidation cobalt and resisted Freeze concrete.
Embodiment 2 produces cobalt oxide, coarse aggregate, fine aggregate, cement 8:40:60:700 sample（Unit serving）, cobalt oxide 8 Part, 40 parts of coarse aggregate, 60 parts of fine aggregate, 700 parts of cement.Other raw material dosages, operating procedure is as embodiment 1.
Embodiment 3 produces cobalt oxide, coarse aggregate, fine aggregate, cement 3:65:30:750 sample（Unit serving）, cobalt oxide 3 Part, 65 parts of coarse aggregate, 30 parts of fine aggregate, 750 parts of cement.Other raw material dosages, operating procedure is as embodiment 1.
Embodiment 4 produces cobalt oxide, coarse aggregate, fine aggregate, cement 3:70:30:750 sample（Unit serving）, cobalt oxide 3 Part, 70 parts of coarse aggregate, 30 parts of fine aggregate, 750 parts of cement.Other raw material dosages, operating procedure is as embodiment 1.
Embodiment 5 produces cobalt oxide, coarse aggregate, fine aggregate, cement 3:75:30:750 sample（Unit serving）, cobalt oxide 3 Part, 75 parts of coarse aggregate, 30 parts of fine aggregate, 750 parts of cement.Other raw material dosages, operating procedure is as embodiment 1.
Embodiment 6 produces cobalt oxide, coarse aggregate, fine aggregate, cement 3:80:30:750 sample（Unit serving）, cobalt oxide 3 Part, 80 parts of coarse aggregate, 30 parts of fine aggregate, 750 parts of cement.Other raw material dosages, operating procedure is as embodiment 1.
Embodiment 7 produces cobalt oxide, coarse aggregate, fine aggregate, cement 3:60:35:750 sample（Unit serving）, cobalt oxide 3 Part, 60 parts of coarse aggregate, 35 parts of fine aggregate, 750 parts of cement.Other raw material dosages, operating procedure is as embodiment 1.
Embodiment 8 produces cobalt oxide, coarse aggregate, fine aggregate, cement 3:60:40:750 sample（Unit serving）, cobalt oxide 3 Part, 60 parts of coarse aggregate, 40 parts of fine aggregate, 750 parts of cement.Other raw material dosages, operating procedure is as embodiment 1.
Embodiment 9 produces cobalt oxide, coarse aggregate, fine aggregate, cement 3:60:45:750 sample（Unit serving）, cobalt oxide 3 Part, 60 parts of coarse aggregate, 45 parts of fine aggregate, 750 parts of cement.Other raw material dosages, operating procedure is as embodiment 1.
Embodiment 10 produces cobalt oxide, coarse aggregate, fine aggregate, cement 3:60:30:730 sample（Unit serving）, cobalt oxide 3 Part, 60 parts of coarse aggregate, 30 parts of fine aggregate, 730 parts of cement.Other raw material dosages, operating procedure is as embodiment 1.
Embodiment 11 produces cobalt oxide, coarse aggregate, fine aggregate, cement 3:60:30:710 sample（Unit serving）, cobalt oxide 3 Part, 60 parts of coarse aggregate, 30 parts of fine aggregate, 710 parts of cement.Other raw material dosages, operating procedure is as embodiment 1.
Embodiment 12 produces cobalt oxide, coarse aggregate, fine aggregate, cement 3:60:30:770 sample（Unit serving）, cobalt oxide 3 Part, 60 parts of coarse aggregate, 30 parts of fine aggregate, 770 parts of cement.Other raw material dosages, operating procedure is as embodiment 1.
Embodiment 13 produces cobalt oxide, coarse aggregate, fine aggregate, cement 3:60:30:790 sample（Unit serving）, cobalt oxide 3 Part, 60 parts of coarse aggregate, 30 parts of fine aggregate, 790 parts of cement.Other raw material dosages, operating procedure is as embodiment 1.
Reference examples 1 produce cobalt oxide, coarse aggregate, fine aggregate, cement 3:60:30:750 sample（Unit serving）, cobalt oxide 3 Part, 60 parts of coarse aggregate, 30 parts of fine aggregate, 750 parts of cement.Do not carry out freeze proof pretreatment to coarse aggregate wherein, other raw material dosages, Operating procedure is as embodiment 1.
Reference examples 2 produce cobalt oxide, coarse aggregate, fine aggregate, cement 3:60:30:750 sample（Unit serving）, cobalt oxide 3 Part, 60 parts of coarse aggregate, 30 parts of fine aggregate, 750 parts of cement.Do not carry out freeze proof pretreatment to fine aggregate wherein, other raw material dosages, Operating procedure is as embodiment 1.
Reference examples 3 produce cobalt oxide, coarse aggregate, fine aggregate, cement 3:60:30:750 sample（Unit serving）, cobalt oxide 3 Part, 60 parts of coarse aggregate, 30 parts of fine aggregate, 750 parts of cement.Do not add cement step by step wherein, other raw material dosages, operating procedure with As embodiment 1.
Reference examples 4 produce cobalt oxide, coarse aggregate, fine aggregate, cement 3:60:30:750 sample（Unit serving）, cobalt oxide 3 Part, 60 parts of coarse aggregate, 30 parts of fine aggregate, 750 parts of cement.Not to cobalt oxide alkali process, operating procedure is as embodiment 1.
Reference examples 5 produce cobalt oxide, coarse aggregate, fine aggregate, cement 3:60:30:750 sample（Unit serving）, cobalt oxide 3 Part, 60 parts of coarse aggregate, 30 parts of fine aggregate, 750 parts of cement.Wherein not to calcination processing under cobalt oxide different atmosphere, other raw materials Dosage, operating procedure is as embodiment 1.
Reference examples 6 produce coarse aggregate, fine aggregate, cement 60:30:750 sample（Unit serving）, 60 parts of coarse aggregate, fine aggregate 30 parts, 750 parts of cement.Cobalt oxide is wherein added without, other raw material dosages, operating procedure is as embodiment 1.
Freeze proof test：According to GBJ82-85《Standard for test methods of longterm performance and durability of ordinary concrete》Middle anti-freezing property Test method, fast jelly method is selected to be tested.It is molded 100mm × 100mm × 400mm prism test specimen, every group of 3 pieces of test specimen. Test specimen carries out freezing-thawing test when maintenance is to 28d ages.4d should take out freeze thawing test specimen from maintenance place before experiment, carry out outward appearance Check, be subsequently put in 20 ± 2 DEG C of water and soak, the water surface should at least be higher by test specimen top surface 2cm during immersion, after freeze thawing test specimen immersion 4d Carry out freezing-thawing test.First measure determines test specimen initial mass before test, has tested after initial mass after test specimen is put into test specimen box It is put into the test-piece stand in freeze thawing case, can now starts Frozen-thawed cycled.
Frozen-thawed cycled 120 times and 240 times, then calculates mass loss rate, and every group of three test specimen calculates average value.
Mass loss rate is calculated as follows
Δwn=(wo-wn)/w0×100%
Wn- after n times Frozen-thawed cycled test specimen mass loss rate（%）, it is accurate to 0.1；
W0The quality of concrete sample before-freezing and thawing test（g）；
Wn- after n times Frozen-thawed cycled concrete sample quality（g）
Frost Resistance coefficient is calculated as follows：
Kn=P × N/300%
The Frost Resistance coefficient of the concrete sample of Kn in formula-after n times Frozen-thawed cycled（%）；
The freezing-thawing cycles that N-concrete sample is subjected to；
The relative dynamic elastic modulus of the concrete sample of P-after n times Frozen-thawed cycled（%）.
Relative dynamic elastic modulus should be calculated as follows：
P=fn/f0×100%
The relative dynamic elastic modulus of the concrete sample of P in formula-after n times Frozen-thawed cycled（%）；
fn- after n times Frozen-thawed cycled concrete sample horizontal fundamental frequency（Hz）；
f0Concrete sample transverse direction fundamental frequency initial value before-freezing and thawing test（Hz）
One freeze proof test result of table
Test result indicates that：It can be found that comparative example 1-10, the obtained addition modified Nano material oxidation cobalt of embodiment 1 resists Jelly concrete quality loss late is minimum, and coefficient of frost resistance highest is so anti-freezing property is best, hence it is evident that is higher by other embodiment, has ten Divide prominent effect.Illustrate that the raw material proportioning has preferably synergy, operating procedure is most beneficial for synthesis good frost resistance Addition modified Nano material oxidation cobalt frost-resistant concrete.Obtained addition modified Nano material oxidation cobalt is freeze proof under other techniques Concrete antifreezing performance is general.Comparative example 1, comparative example 1,2,3,4,5,6 are can be found that.Coarse aggregate, fine aggregate are not resisted Freeze pretreatment, do not add cement step by step, not to cobalt oxide alkali process, not to cobalt oxide under different atmosphere made from calcination processing It is all bad to add modified Nano material oxidation cobalt frost-resistant concrete anti-freezing property.

Claims (3)

  1. A kind of 1. preparation method for freezing concrete, it is characterised in that：With cobalt oxide, P.O42.5R type cement, coarse aggregate, thin collection Material, triterpenoid saponin air entraining agent, the raw material such as efficient naphthalene water reducer Multistep feeding, magnetic field processing, are poured and waited just by freeze proof processing Method synthesizes.
  2. 2. a kind of preparation method of frost-resistant concrete, it is characterised in that comprise the following steps：Step 1, coarse aggregate inserted into sealing In container, negative pressure 0.05MPa is evacuated to vavuum pump, POLYPROPYLENE GLYCOL emulsion, POLYPROPYLENE GLYCOL emulsion are then injected into container Content is 60%, keeps standing 5h under the condition of negative pressure of stabilization, the coarse aggregate after standing is fished in relative humidity 50 ± 5%, Conserved 3 days under the conditions of 25 ± 2 DEG C of temperature, obtain freeze proof pretreatment coarse aggregate；
    Step 2, fine aggregate is added in roller agitator, the mixed solution of polyethylene glycol and propenyl added, in NH3 Stir process 2h under atmosphere, relative humidity 40 ± 5% is then rested on, conserves 2 days, obtains freeze proof pre- under the conditions of 20 ± 2 DEG C of temperature Handle fine aggregate；
    Step 3, by the coarse aggregate pre-processed and fine aggregate under high speed agitator be well mixed, then immersion 0.5mol/L KCl solution under 5h, then coarse aggregate and fine aggregate are poured into processing 60min, then stewing process are crossed in woven bag；
    In step 4 and then the coarse aggregate and fine aggregate mixture of handling triterpenoid saponin air entraining agent and running water addition well, quickly Stir process makes it well mixed obtain preliminary solidifying slurry thing；
    Step 5 and then 50% cement is added in above-mentioned preliminary solidifying slurry, stirs 5~20 minutes, make cement, preliminary solidifying slurry Thing and water form the extraordinary slurry of mobility, play lubrication, are advantageous to stir, and can guarantee that porosity；
    Step 6 and then remaining 50% cement is added in above-mentioned slurry, then add running water, efficient naphthalene system diminishing Agent, stir 15~20 minutes, in the presence of mechanical agitation, be uniformly wrapped in coarse aggregate, the surface of fine aggregate, make its surface model De Huali is strengthened, while also further enhances its toughness, is advantageous to improve cryoprotective effects；
    Step 7, cobalt oxide is pre-processed, be fed first into 5% sodium hydroxide solution, then in additional magnetic fields Lower immersion 2h;
    Step 8 and then the MgCl in 0.2mol/L2Solution under wash away 10-15 times repeatedly, then in air dry oven dry Processing；
    Step 9, finally carry out calcination processing, nano level modified cobalt oxide；
    Step 10, obtained nano level modified cobalt oxide is added in above-mentioned solidifying slurry, quickly stirred；
    Step 11, moulding by casting is carried out, precuring, be stripped, maintenance, product finally gives addition modified Nano material oxidation cobalt and resisted Freeze concrete.
  3. A kind of 3. preparation method of frost-resistant concrete according to claim 2, it is characterised in that：In step 9, calcination processing Including：The cobalt oxide handled well is transferred in Muffle furnace：First in N20.5kpa under atmosphere, 300 DEG C of calcining 3h, then in sky Under gas atmosphere, 0.4kpa350 DEG C of calcination processing 4h, nano level modified cobalt oxide is finally given.
CN201710663884.2A 2017-08-06 2017-08-06 A kind of preparation method of frost-resistant concrete Pending CN107459299A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2312088C1 (en) * 2006-05-10 2007-12-10 Юлия Алексеевна Щепочкина Ceramic mix
CN103102129A (en) * 2013-02-25 2013-05-15 黑龙江省交通科学研究所 Air entrained concrete
CN103396049A (en) * 2013-08-09 2013-11-20 卫峰 Production method for novel building energy-saving wallbody self thermal insulation blocks
CN103979852A (en) * 2014-03-31 2014-08-13 安徽鑫润新型材料有限公司 Antifreeze concrete and preparation method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2312088C1 (en) * 2006-05-10 2007-12-10 Юлия Алексеевна Щепочкина Ceramic mix
CN103102129A (en) * 2013-02-25 2013-05-15 黑龙江省交通科学研究所 Air entrained concrete
CN103396049A (en) * 2013-08-09 2013-11-20 卫峰 Production method for novel building energy-saving wallbody self thermal insulation blocks
CN103979852A (en) * 2014-03-31 2014-08-13 安徽鑫润新型材料有限公司 Antifreeze concrete and preparation method thereof

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Application publication date: 20171212