CN100591639C - Method for producing high-strength and high-ductility light aggregate concrete - Google Patents
Method for producing high-strength and high-ductility light aggregate concrete Download PDFInfo
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- CN100591639C CN100591639C CN200710053634A CN200710053634A CN100591639C CN 100591639 C CN100591639 C CN 100591639C CN 200710053634 A CN200710053634 A CN 200710053634A CN 200710053634 A CN200710053634 A CN 200710053634A CN 100591639 C CN100591639 C CN 100591639C
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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
- 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
- C04B20/1055—Coating or impregnating with inorganic materials
- C04B20/1077—Cements, e.g. waterglass
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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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to a preparation method of light aggregate concrete with high strength and high toughness. The invention is characterized in that the preparation method includes the following steps: firstly, the reinforcing and plasticizing pretreatment of the light aggregate: (1) the plasticizing pretreatment of the light aggregate: the light aggregate adsorbs the polymer to obtain plasticizing pretreatment light aggregate; (2) the reinforcing and plasticizing aftertreatment: the plasticizing pretreatment light aggregate is put into reinforcing and plasticizing aftertreatment slurry, then being taken out after being mixed for one to three minutes, and then being conserved 2.5 to 3.5 days in the condition of 85 percent to 95 percent of relative humidity and the temperature of 23 DEGC to 27 DEG C, so as to obtain reinforcing and plasticizing aftertreatment light aggregate; secondly, preparation for the light aggregate concrete with high strength and high toughness: the reinforcing and plasticizing aftertreatment light aggregate, mineral admixture and cement are put into fine aggregate, poly carboxylic acid high efficiency water reducing agent and polymer, then organic artificial steel wire fibre is put to mix dryly for 30 to 60 seconds, and then the water is put to evenly mix, thus the light aggregate concrete with high strength and high toughness is obtained. The light aggregate concrete prepared by adopting the method above has high strength and high toughness.
Description
Technical field
The invention belongs to building material field, be specifically related to a kind of preparation method of light aggregate concrete.
Background technology
Light aggregate concrete has advantages such as lightweight, durable, energy-saving and environmental protection, have broad application prospects in longspan structure engineering such as steel box girder bridge floor paving, Highrise buildings etc., but the intensity of light aggregate concrete and toughness are all lower, the strength grade of practical engineering application is no more than LC50, fracture toughness property index η
30Less than 15, be difficult to satisfy heavy construction, Highrise buildings to intensity and flexible requirement, limited the application of light aggregate concrete to a great extent.The major cause that causes above problem is that the granule strength of light-weight aggregate self is lower, and particle is covered with the tiny crack easy fracture, and the porous of light-weight aggregate own, quality are soft, under the effect of load, easily produce stress concentration, cause progress of fracture at light-weight aggregate internal void or cracks.And the Young's modulus of light-weight aggregate is lower, can not resist distortion and progress of fracture.At above intensity and the insufficient problem of toughness, mainly contain two kinds of methods at present at the technical elements that improves light aggregate concrete intensity, a kind of is the methods such as intensity that admixture silicon ash, use cement of high index, increase cement consumption promptly improve cement stone in concrete, this kind method cost is higher, concrete contraction, creep and fragility increases, toughness reduces; Another kind method is to improve the density of light-weight aggregate, thereby arrives the purpose that improves light-weight aggregate intensity, though improved the intensity of light-weight aggregate like this, thus concrete strength improved, also increased the deadweight of light-weight aggregate simultaneously, concrete density is increased.Increasing high strength lightweight aggregate concrete flexible technical elements, mainly realize by the admixture steel fiber, though but these methods can be improved fragility effectively, improve toughness, but increase rate is limited, mainly be self to have a large amount of tiny cracks owing to gather materials, it is lower to play mould, easily cause stress concentration, cause crack propagation and rupture, limited the toughening effect of steel fiber, and can reduce concrete workability, simultaneously, the volume of steel fiber is crossed the deadweight that conference improves light aggregate concrete, and steel fiber can reduce the performance of light aggregate concrete significantly because corrosion takes place, and causes concrete to destroy.Though use high-strength light-weight aggregate can effectively increase concrete intensity, the granule strength of present high-strength light-weight aggregate is mainly at 6.0～8.0MPa, and is covered with fine crack, so be difficult to make high tenacity, high strength light aggregate concrete.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of high-strength and high-ductility light aggregate concrete, the light aggregate concrete of this method preparation has high strength, high tenacity.
To achieve these goals, technical scheme of the present invention is: the preparation method of high-strength and high-ductility light aggregate concrete is characterized in that it comprises the steps:
1) the toughness reinforcing pre-treatment of the enhancing of light-weight aggregate:
(1) the toughness reinforcing pre-treatment of light-weight aggregate: light-weight aggregate is inserted in the sealed vessel, be evacuated to negative pressure 0.05～0.10MPa with vacuum pump, injection of polymer emulsion in container then, the solid content of polymer emulsion is 20～60% (quality), keep leaving standstill 0.5～3h under the stable condition of negative pressure, light-weight aggregate after leaving standstill is fished in relative humidity 60 ± 5%, and maintenance is 1～3 day under 25 ± 2 ℃ of conditions of temperature, gets toughness reinforcing pre-treatment light-weight aggregate;
(2) strengthen toughness reinforcing processing again: by mass ratio be: water: cement: silicon ash: swelling agent :=1: (3.00～3.40): (0.30～0.60): (0.10～0.15), choose water, cement, silicon ash and swelling agent, 0.8～1.65% (quality) by cement consumption chosen high-efficiency water-reducing agent of poly-carboxylic acid, 5～10% (quality) by cement consumption are chosen polymer emulsion, the solid content of polymer emulsion is 20～60% (quality), is 1.0～1.5kg/m by the volumetric usage of cement
3Choose polypropylene fibre; Cement, silicon ash, swelling agent, polypropylene fibre, high-efficiency water-reducing agent of poly-carboxylic acid, polymer emulsion and water stirred to make strengthen the toughness reinforcing slurry of handling again; Toughness reinforcing pre-treatment light-weight aggregate is put into the toughness reinforcing slurry of handling again of enhancing, take out behind stirring 1～3min, in relative humidity 90 ± 5%, maintenance is 2.5～3.5 days under 25 ± 2 ℃ of conditions of temperature, must strengthen the toughness reinforcing light-weight aggregate of handling again;
2) preparation of high-strength and high-ductility light aggregate concrete:
By mass ratio be: water: strengthen the toughness reinforcing light-weight aggregate of handling again: cement: fine aggregate: mineral admixture=1: (3.00～3.50): (2.90～3.50): (3.80～3.95): (0.15～0.40), choose water, strengthen toughness reinforcing light-weight aggregate, cement, fine aggregate and the mineral admixture handled again; 0.8～1.65% (quality) by cement consumption chosen high-efficiency water-reducing agent of poly-carboxylic acid, by strengthening the toughness reinforcing 2.5～9.0kg/m that handles the light-weight aggregate volume again
3Choose organic imitative steel wire fibre, choose polymer emulsion by 10～20% (quality) of mineral admixture and cement consumption, the solid content of polymer emulsion is 20～60% (quality);
In fine aggregate, high-efficiency water-reducing agent of poly-carboxylic acid and polymer emulsion, add earlier and strengthen toughness reinforcing light-weight aggregate, mineral admixture, the cement handled again, add organic imitative steel wire fibre dry mixing 30～60s again, and then add water and stir, high-strength and high-ductility light aggregate concrete.
Described light-weight aggregate is: particle diameter 5～16mm, apparent density 1200～1500kg/m
3, tap density 700～1100kg/m
3, cylindrical compress strength 〉=6.5MPa leca, haydites of book structure or lytag.
Described polymer emulsion is benzene emulsion or polyvinyl alcohol emulsion, and solid content is 20～60% (quality).
Described cement is: strength grade 42.5 or 52.5 ordinary Portland cement, silicate cement.
Described swelling agent is: UEA expansion agent series, limited expansion rate are 0.02～0.10%.
The diameter of described polypropylene fibre is 20～48 μ m, and length is 3～8mm.
Described high-efficiency water-reducing agent of poly-carboxylic acid, water-reducing rate are 20～40%.
Described fine aggregate is: river sand or machine-processed sand, fineness modulus are 2.6～3.1.
Described mineral admixture is any one or the two kinds of mixing in silicon ash, the II level flyash, and two kinds is any proportioning when mixing; Specific surface area 20000～the 30000m of silicon ash
2/ kg; The water requirement (quality) of II level flyash is than≤105%.
The diameter of described organic imitative steel wire fibre is 0.5mm～1.0mm, and length is 30～50mm.
The present invention makes inner hole inwall of light-weight aggregate and tiny crack adhere to one layer of polymeric film (getting toughness reinforcing pre-treatment light-weight aggregate) by light-weight aggregate adsorpting polymerization thing emulsion, forms reticulated structure in light-weight aggregate, improves the toughness of light-weight aggregate, limits the expansion of its crackle; Further adopt the toughness reinforcing slurry of preparing by a certain percentage by cement, silicon ash, swelling agent, polypropylene fibre, high-efficiency water-reducing agent of poly-carboxylic acid, polymer emulsion and water of handling again of enhancing, make the light-weight aggregate crizzle up, fiber is built into network structure in strengthening toughening layer, improve intensity, toughness and the non-deformability of light-weight aggregate.Utilize toughness reinforcing light-weight aggregate, water, cement, fine aggregate, mineral admixture, high-efficiency water-reducing agent of poly-carboxylic acid, organic imitative steel wire fibre and the polymer emulsion handled again of this kind enhancing to prepare strength grade LC40～LC70, toughness index η
30Be 20～30 high-strength and high-ductility light aggregate concrete, from heavy and light, structure durability is good, satisfies the requirement such as Structural Engineerings such as long-span bridge beam, steel box girder bridge floor paving layer, Highrise buildings.
The technical indicator of high-strength and high-ductility light aggregate concrete of the present invention:
1, pretreated light-weight aggregate performance index:
Cylindrical compress strength: more than the 9.0MPa;
Pellet density: 1400～1900kg/m
3
2, the performance index of high-strength and high-ductility light aggregate concrete:
Mechanical property: bending tensile strength 〉=6.0MPa, 28d ultimate compression strength 〉=50.0MPa;
The slump: 160～220mm;
Apparent density: 1800～2000kg/m
3
Fracture toughness property index η
30: 20～30;
Thermal conductivity: 0.80～1.2W/MK;
Young's modulus: 〉=25.0GPa;
Impervious grade: more than the P12;
Freeze proof grade: 〉=F300;
Fatigue load number of times: 〉=300 ten thousand times.
Embodiment
In order to understand the present invention better, further illustrate content of the present invention below in conjunction with embodiment, but content of the present invention not only is confined to the following examples.
Embodiment 1:
The preparation method of high-strength and high-ductility light aggregate concrete, it comprises the steps:
Starting material are prepared:
Light-weight aggregate: particle diameter 5～16mm, apparent density 1200～1500kg/m
3, tap density 700～1100kg/m
3, cylindrical compress strength 〉=6.5MPa leca;
Polymer emulsion: benzene emulsion, solid content are 50% (quality);
Cement: the ordinary Portland cement of strength grade 42.5;
Described swelling agent is: UEA is a swelling agent, and limited expansion rate is 0.03%;
Polypropylene fibre: diameter 20 μ m are 3mm in the length;
Water reducer: high-efficiency water-reducing agent of poly-carboxylic acid, water-reducing rate are 20～40%;
Fine aggregate: river sand, fineness modulus are 2.6～3.1;
Mineral admixture is: II level flyash, water requirement (quality)≤105%;
The silicon ash: specific surface area is greater than 20000～30000m
2/ kg;
Organic imitative steel wire fibre: diameter is 0.5mm, and length is 30～50mm.
1) the toughness reinforcing pre-treatment of the enhancing of light-weight aggregate:
(1) the toughness reinforcing pre-treatment of light-weight aggregate: the sealed vessel of preparing specification 3 * a 5 * 5m, light-weight aggregate is inserted in the sealed vessel, be evacuated to negative pressure 0.06MPa with vacuum pump, injection of polymer emulsion in container then, the solid content of polymer emulsion is 50% (quality), keeps leaving standstill 1h under the stable condition of negative pressure, and the light-weight aggregate after leaving standstill is fished in relative humidity 60 ± 5%, maintenance is 3 days under 25 ± 2 ℃ of conditions of temperature, gets toughness reinforcing pre-treatment light-weight aggregate; Make polymkeric substance in light-weight aggregate, form reticulated structure, improve the toughness of light-weight aggregate, limit the expansion of its crackle;
(2) strengthen toughness reinforcing processing again: strengthen the toughness reinforcing slurry of handling again and form by cement, silicon ash, swelling agent, polypropylene fibre, high-efficiency water-reducing agent of poly-carboxylic acid, polymer emulsion and water; By mass ratio be: water: cement: silicon ash: swelling agent :=1: 3.1: 0.30: 0.15, choose water, cement, silicon ash and swelling agent, 1.0% (quality) by cement consumption chosen high-efficiency water-reducing agent of poly-carboxylic acid, 6% (quality) by cement consumption chosen polymer emulsion, the solid content of polymer emulsion is 50% (quality), is 1.0kg/m by the volumetric usage of cement
3Choose polypropylene fibre; Cement, silicon ash, swelling agent, polypropylene fibre, high-efficiency water-reducing agent of poly-carboxylic acid, polymer emulsion and water stirred to make strengthen the toughness reinforcing slurry of handling again; Toughness reinforcing pre-treatment light-weight aggregate is put into the toughness reinforcing slurry of handling again of enhancing, take out behind the stirring 3min, in relative humidity 90 ± 5%, maintenance is 3 days under 25 ± 2 ℃ of conditions of temperature, must strengthen the toughness reinforcing light-weight aggregate of handling again; Making the toughness reinforcing slurry of handling again of enhancing is 0.5～1mm high-strength and high-ductility layer at toughness reinforcing pre-treatment light-weight aggregate surface formation one layer thickness, further make toughness reinforcing pre-treatment light-weight aggregate crizzle up, polypropylene fibre is built into network structure in the high-strength and high-ductility layer, improve intensity, toughness and the non-deformability of light-weight aggregate;
2) preparation of high-strength and high-ductility light aggregate concrete:
High-strength and high-ductility light aggregate concrete is made up of water, toughness reinforcing light-weight aggregate, cement, fine aggregate, mineral admixture, high-efficiency water-reducing agent of poly-carboxylic acid, organic imitative steel wire fibre and the polymer emulsion handled again of enhancing; By mass ratio be: water: strengthen the toughness reinforcing light-weight aggregate of handling again: cement: fine aggregate: mineral admixture=1: 3.10: 2.95: 3.85: 0.20, choose water, strengthen toughness reinforcing light-weight aggregate, cement, fine aggregate and the mineral admixture handled again; 1.0% (quality) by cement consumption chosen high-efficiency water-reducing agent of poly-carboxylic acid, by strengthening the toughness reinforcing 8.0kg/m that handles the light-weight aggregate volume again
3Choose organic imitative steel wire fibre, choose polymer emulsion by 15% (quality) of mineral admixture and cement consumption, the solid content of polymer emulsion is 50% (quality);
In fine aggregate, high-efficiency water-reducing agent of poly-carboxylic acid and polymer emulsion, add earlier and strengthen toughness reinforcing light-weight aggregate, mineral admixture, the cement handled again, add organic imitative steel wire fibre dry mixing 60s again, and then add water and stir, high-strength and high-ductility light aggregate concrete; Organic so imitative steel wire fibre is difficult for reuniting, easily homodisperse.
The intensity of high-strength and high-ductility light aggregate concrete is 61.8MPa, fracture toughness property index η
30Be 28.
Embodiment 2:
The preparation method of high-strength and high-ductility light aggregate concrete, it comprises the steps:
Starting material are prepared:
Light-weight aggregate is: particle diameter 5～16mm, apparent density 1200～1500kg/m
3, tap density 700～1100kg/m
3, cylindrical compress strength 〉=6.5MPa haydites of book structure;
Polymer emulsion is: polyvinyl alcohol emulsion, solid content are 40% (quality);
Cement is: the silicate cement of strength grade 42.5;
Swelling agent is: UEA is a swelling agent, and limited expansion rate is 0.05%;
Polypropylene fibre is: diameter 20 μ m, and length is 5mm;
High-efficiency water-reducing agent of poly-carboxylic acid, water-reducing rate are 20～40%;
Fine aggregate is: river sand, fineness modulus are 2.6～3.1;
Mineral admixture is an II level flyash, and the water requirement (quality) of II level flyash is than≤105%;
Organic imitative steel wire fibre is: diameter is 0.5mm, and length is 30～50mm;
The silicon ash: specific surface area is greater than 20000～30000m
2/ kg.
1) the toughness reinforcing pre-treatment of the enhancing of light-weight aggregate:
(1) the toughness reinforcing pre-treatment of light-weight aggregate: the sealed vessel of preparing specification 3 * a 5 * 5m, light-weight aggregate is inserted in the sealed vessel, be evacuated to negative pressure 0.06MPa with vacuum pump, injection of polymer emulsion in container then, the solid content of polymer emulsion is 40% (quality), keeps leaving standstill 1h under the stable condition of negative pressure, and the light-weight aggregate after leaving standstill is fished in relative humidity 60 ± 5%, maintenance is 3 days under 25 ± 2 ℃ of conditions of temperature, gets toughness reinforcing pre-treatment light-weight aggregate; Make polymkeric substance in light-weight aggregate, form reticulated structure, improve the toughness of light-weight aggregate, limit the expansion of its crackle;
(2) strengthen toughness reinforcing processing again: strengthen the toughness reinforcing slurry of handling again and form by cement, silicon ash, swelling agent, polypropylene fibre, high-efficiency water-reducing agent of poly-carboxylic acid, polymer emulsion and water; By mass ratio be: water: cement: silicon ash: swelling agent :=1: 3.20: 0.3: 0.15, choose water, cement, silicon ash and swelling agent, 1.4% (quality) by cement consumption chosen high-efficiency water-reducing agent of poly-carboxylic acid, 7% (quality) by cement consumption chosen polymer emulsion, the solid content of polymer emulsion is 40% (quality), is 1.0kg/m by the volumetric usage of cement
3Choose polypropylene fibre; Cement, silicon ash, swelling agent, polypropylene fibre, high-efficiency water-reducing agent of poly-carboxylic acid, polymer emulsion and water stirred to make strengthen the toughness reinforcing slurry of handling again; Toughness reinforcing pre-treatment light-weight aggregate is put into the toughness reinforcing slurry of handling again of enhancing, take out behind the stirring 3min, in relative humidity 90 ± 5%, maintenance is 3 days under 25 ± 2 ℃ of conditions of temperature, must strengthen the toughness reinforcing light-weight aggregate of handling again; Making the toughness reinforcing slurry of handling again of enhancing is 0.5～1mm high-strength and high-ductility layer at toughness reinforcing pre-treatment light-weight aggregate surface formation one layer thickness, further make toughness reinforcing pre-treatment light-weight aggregate crizzle up, polypropylene fibre is built into network structure in the high-strength and high-ductility layer, improve intensity, toughness and the non-deformability of light-weight aggregate;
2) preparation of high-strength and high-ductility light aggregate concrete:
High-strength and high-ductility light aggregate concrete is made up of water, toughness reinforcing light-weight aggregate, cement, fine aggregate, mineral admixture, high-efficiency water-reducing agent of poly-carboxylic acid, organic imitative steel wire fibre and the polymer emulsion handled again of enhancing; By mass ratio be: water: strengthen the toughness reinforcing light-weight aggregate of handling again: cement: fine aggregate: mineral admixture=1: 3.09: 3.10: 3.91: 0.20, choose water, strengthen toughness reinforcing light-weight aggregate, cement, fine aggregate and the mineral admixture handled again; 1.4% (quality) by cement consumption chosen high-efficiency water-reducing agent of poly-carboxylic acid, by strengthening the toughness reinforcing 9.0kg/m that handles the light-weight aggregate volume again
3Choose organic imitative steel wire fibre, choose polymer emulsion by 12% (quality) of mineral admixture and cement consumption, the solid content of polymer emulsion is 40% (quality);
In fine aggregate, high-efficiency water-reducing agent of poly-carboxylic acid and polymer emulsion, add earlier and strengthen toughness reinforcing light-weight aggregate, mineral admixture, the cement handled again, add organic imitative steel wire fibre dry mixing 60s again, and then add water and stir, high-strength and high-ductility light aggregate concrete; Organic so imitative steel wire fibre is difficult for reuniting, easily homodisperse.
The intensity of high-strength and high-ductility light aggregate concrete is 63.5MPa, fracture toughness property index η
30Be 29.
Embodiment 3:
The preparation method of high-strength and high-ductility light aggregate concrete, it comprises the steps:
Starting material are prepared:
Light-weight aggregate is: particle diameter 5～16mm, apparent density 1200～1500kg/m
3, tap density 700～1100kg/m
3, cylindrical compress strength 〉=6.5MPa lytag;
Polymer emulsion is: benzene emulsion, solid content are 50% (quality);
Cement is: the silicate cement of strength grade 52.5;
Swelling agent is: UEA is a swelling agent, and limited expansion rate is 0.06%;
Polypropylene fibre is: diameter 48 μ m, and length is 8mm;
High-efficiency water-reducing agent of poly-carboxylic acid, water-reducing rate are 20～40%;
Fine aggregate is: machine-processed sand, fineness modulus are 2.6～3.1;
Mineral admixture is an II level flyash, and the water requirement (quality) of II level flyash is than≤105%;
Organic imitative steel wire fibre is: diameter is 1.0mm, and length is 30～50mm;
The silicon ash: specific surface area is greater than 20000～30000m
2/ kg.
1) the toughness reinforcing pre-treatment of the enhancing of light-weight aggregate:
(1) the toughness reinforcing pre-treatment of light-weight aggregate: the sealed vessel of preparing specification 3 * a 5 * 5m, light-weight aggregate is inserted in the sealed vessel, be evacuated to negative pressure 0.06MPa with vacuum pump, injection of polymer emulsion in container then, the solid content of polymer emulsion is 50% (quality), keeps leaving standstill 1h under the stable condition of negative pressure, and the light-weight aggregate after leaving standstill is fished in relative humidity 60 ± 5%, maintenance is 3 days under 25 ± 2 ℃ of conditions of temperature, gets toughness reinforcing pre-treatment light-weight aggregate; Make polymkeric substance in light-weight aggregate, form reticulated structure, improve the toughness of light-weight aggregate, limit the expansion of its crackle;
(2) strengthen toughness reinforcing processing again: strengthen the toughness reinforcing slurry of handling again and form by cement, silicon ash, swelling agent, polypropylene fibre, high-efficiency water-reducing agent of poly-carboxylic acid, polymer emulsion and water; By mass ratio be: water: cement: silicon ash: swelling agent :=1: 3.20: 0.3: 0.15, choose water, cement, silicon ash and swelling agent, 0.8% (quality) by cement consumption chosen high-efficiency water-reducing agent of poly-carboxylic acid, 7% (quality) by cement consumption chosen polymer emulsion, the solid content of polymer emulsion is 50% (quality), is 1.0kg/m by the volumetric usage of cement
3Choose polypropylene fibre; Cement, silicon ash, swelling agent, polypropylene fibre, high-efficiency water-reducing agent of poly-carboxylic acid, polymer emulsion and water stirred to make strengthen the toughness reinforcing slurry of handling again; Toughness reinforcing pre-treatment light-weight aggregate is put into the toughness reinforcing slurry of handling again of enhancing, take out behind the stirring 3min, in relative humidity 90 ± 5%, maintenance is 3 days under 25 ± 2 ℃ of conditions of temperature, must strengthen the toughness reinforcing light-weight aggregate of handling again; Making the toughness reinforcing slurry of handling again of enhancing is 0.5～1mm high-strength and high-ductility layer at toughness reinforcing pre-treatment light-weight aggregate surface formation one layer thickness, further make toughness reinforcing pre-treatment light-weight aggregate crizzle up, polypropylene fibre is built into network structure in the high-strength and high-ductility layer, improve intensity, toughness and the non-deformability of light-weight aggregate;
2) preparation of high-strength and high-ductility light aggregate concrete:
High-strength and high-ductility light aggregate concrete is made up of water, toughness reinforcing light-weight aggregate, cement, fine aggregate, mineral admixture, high-efficiency water-reducing agent of poly-carboxylic acid, organic imitative steel wire fibre and the polymer emulsion handled again of enhancing; By mass ratio be: water: strengthen the toughness reinforcing light-weight aggregate of handling again: cement: fine aggregate: mineral admixture=1: 3.12: 3.15: 3.86: 0.22, choose water, strengthen toughness reinforcing light-weight aggregate, cement, fine aggregate and the mineral admixture handled again; 0.8% (quality) by cement consumption chosen high-efficiency water-reducing agent of poly-carboxylic acid, by strengthening the toughness reinforcing 9.0kg/m that handles the light-weight aggregate volume again
3Choose organic imitative steel wire fibre, choose polymer emulsion by 10% (quality) of mineral admixture and cement consumption, the solid content of polymer emulsion is 50% (quality);
In fine aggregate, high-efficiency water-reducing agent of poly-carboxylic acid and polymer emulsion, add earlier and strengthen toughness reinforcing light-weight aggregate, mineral admixture, the cement handled again, add organic imitative steel wire fibre dry mixing 60s again, and then add water and stir, high-strength and high-ductility light aggregate concrete; Organic so imitative steel wire fibre is difficult for reuniting, easily homodisperse.
The intensity of high-strength and high-ductility light aggregate concrete is 62.5MPa, fracture toughness property index η
30Be 28.
Embodiment 4:
The preparation method of high-strength and high-ductility light aggregate concrete, it comprises the steps:
Starting material are prepared:
Light-weight aggregate is: particle diameter 5～16mm, apparent density 1200～1500kg/m
3, tap density 700～1100kg/m
3, cylindrical compress strength 〉=6.5MPa leca;
Polymer emulsion is: polyvinyl alcohol emulsion, solid content are 40% (quality);
Cement is: the ordinary Portland cement of strength grade 42.5;
Swelling agent is: UEA is a swelling agent, and limited expansion rate is 0.04%;
Polypropylene fibre is: diameter 20 μ m, and length is 8mm;
High-efficiency water-reducing agent of poly-carboxylic acid, water-reducing rate are 20～40%;
Fine aggregate is: river sand, fineness modulus are 2.6～3.1;
Mineral admixture is an II level flyash, and the water requirement (quality) of II level flyash is than≤105%;
Described organic imitative steel wire fibre is: diameter is 1.0mm, and length is 30～50mm;
The silicon ash: specific surface area is greater than 20000～30000m
2/ kg.
1) the toughness reinforcing pre-treatment of the enhancing of light-weight aggregate:
(1) the toughness reinforcing pre-treatment of light-weight aggregate: the sealed vessel of preparing specification 3 * a 5 * 5m, light-weight aggregate is inserted in the sealed vessel, be evacuated to negative pressure 0.07MPa with vacuum pump, injection of polymer emulsion in container then, the solid content of polymer emulsion is 40% (quality), keeps leaving standstill 1h under the stable condition of negative pressure, and the light-weight aggregate after leaving standstill is fished in relative humidity 60 ± 5%, maintenance is 3 days under 25 ± 2 ℃ of conditions of temperature, gets toughness reinforcing pre-treatment light-weight aggregate; Make polymkeric substance in light-weight aggregate, form reticulated structure, improve the toughness of light-weight aggregate, limit the expansion of its crackle;
(2) strengthen toughness reinforcing processing again: strengthen the toughness reinforcing slurry of handling again and form by cement, silicon ash, swelling agent, polypropylene fibre, high-efficiency water-reducing agent of poly-carboxylic acid, polymer emulsion and water; By mass ratio be: water: cement: silicon ash: swelling agent :=1: 3.30: 0.30: 0.15, choose water, cement, silicon ash and swelling agent, 0.8% (quality) by cement consumption chosen high-efficiency water-reducing agent of poly-carboxylic acid, 8% (quality) by cement consumption chosen polymer emulsion, the solid content of polymer emulsion is 40% (quality), is 1.0kg/m by the volumetric usage of cement
3Choose polypropylene fibre; Cement, silicon ash, swelling agent, polypropylene fibre, high-efficiency water-reducing agent of poly-carboxylic acid, polymer emulsion and water stirred to make strengthen the toughness reinforcing slurry of handling again; Toughness reinforcing pre-treatment light-weight aggregate is put into the toughness reinforcing slurry of handling again of enhancing, take out behind the stirring 3min, in relative humidity 90 ± 5%, maintenance is 3 days under 25 ± 2 ℃ of conditions of temperature, must strengthen the toughness reinforcing light-weight aggregate of handling again; Making the toughness reinforcing slurry of handling again of enhancing is 0.5～1mm high-strength and high-ductility layer at toughness reinforcing pre-treatment light-weight aggregate surface formation one layer thickness, further make toughness reinforcing pre-treatment light-weight aggregate crizzle up, polypropylene fibre is built into network structure in the high-strength and high-ductility layer, improve intensity, toughness and the non-deformability of light-weight aggregate;
2) preparation of high-strength and high-ductility light aggregate concrete:
High-strength and high-ductility light aggregate concrete is made up of water, toughness reinforcing light-weight aggregate, cement, fine aggregate, mineral admixture, high-efficiency water-reducing agent of poly-carboxylic acid, organic imitative steel wire fibre and the polymer emulsion handled again of enhancing; By mass ratio be: water: strengthen the toughness reinforcing light-weight aggregate of handling again: cement: fine aggregate: mineral admixture=1: 3.10: 3.29: 3.83: 0.19, choose water, strengthen toughness reinforcing light-weight aggregate, cement, fine aggregate and the mineral admixture handled again; 1.2% (quality) by cement consumption chosen high-efficiency water-reducing agent of poly-carboxylic acid, by strengthening the toughness reinforcing 8.0kg/m that handles the light-weight aggregate volume again
3Choose organic imitative steel wire fibre, choose polymer emulsion by 15% (quality) of mineral admixture and cement consumption, the solid content of polymer emulsion is 40% (quality);
In fine aggregate, high-efficiency water-reducing agent of poly-carboxylic acid and polymer emulsion, add earlier and strengthen toughness reinforcing light-weight aggregate, mineral admixture, the cement handled again, add organic imitative steel wire fibre dry mixing 60s again, and then add water and stir, high-strength and high-ductility light aggregate concrete; Organic so imitative steel wire fibre is difficult for reuniting, easily homodisperse.
The intensity of high-strength and high-ductility light aggregate concrete is 64.6MPa, fracture toughness property index η
30Be 27.
Embodiment 5:
The preparation method of high-strength and high-ductility light aggregate concrete, it comprises the steps:
Starting material are prepared:
Light-weight aggregate is: particle diameter 5～16mm, apparent density 1200～1500kg/m
3, tap density 700～1100kg/m
3, cylindrical compress strength 〉=6.5MPa haydites of book structure;
Polymer emulsion is: benzene emulsion, solid content are 20% (quality);
Cement is: the ordinary Portland cement of strength grade 42.5;
Swelling agent is: UEA is a swelling agent, and limited expansion rate is 0.07%;
Polypropylene fibre is: diameter 20 μ m, and length is 3mm;
High-efficiency water-reducing agent of poly-carboxylic acid, water-reducing rate are 20～40%;
Fine aggregate is: river sand, fineness modulus are 2.6～3.1;
Mineral admixture is in silicon ash and the II level flyash, silicon ash and II level flyash respectively 1/2; Specific surface area 20000～the 30000m of silicon ash
2/ kg; The water requirement (quality) of II level flyash is than≤105%;
Organic imitative steel wire fibre is: diameter is 0.5mm, and length is 30mm;
The silicon ash: specific surface area is greater than 20000～30000m
2/ kg.
1) the toughness reinforcing pre-treatment of the enhancing of light-weight aggregate:
(1) the toughness reinforcing pre-treatment of light-weight aggregate: light-weight aggregate is inserted in the sealed vessel, be evacuated to negative pressure 0.05MPa with vacuum pump, injection of polymer emulsion in container then, the solid content of polymer emulsion is 20% (quality), keep leaving standstill 0.5h under the stable condition of negative pressure, light-weight aggregate after leaving standstill is fished in relative humidity 55%, and maintenance is 1 day under 23 ℃ of conditions of temperature, gets toughness reinforcing pre-treatment light-weight aggregate; Make polymkeric substance in light-weight aggregate, form reticulated structure, improve the toughness of light-weight aggregate, limit the expansion of its crackle;
(2) strengthen toughness reinforcing processing again: strengthen the toughness reinforcing slurry of handling again and form by cement, silicon ash, swelling agent, polypropylene fibre, high-efficiency water-reducing agent of poly-carboxylic acid, polymer emulsion and water; By mass ratio be: water: cement: silicon ash: swelling agent :=1: 3.00: 0.30: 0.10, choose water, cement, silicon ash and swelling agent, 0.8% (quality) by cement consumption chosen high-efficiency water-reducing agent of poly-carboxylic acid, 5% (quality) by cement consumption chosen polymer emulsion, the solid content of polymer emulsion is 20% (quality), is 1.0kg/m by the volumetric usage of cement
3Choose polypropylene fibre; Cement, silicon ash, swelling agent, polypropylene fibre, high-efficiency water-reducing agent of poly-carboxylic acid, polymer emulsion and water stirred to make strengthen the toughness reinforcing slurry of handling again; Toughness reinforcing pre-treatment light-weight aggregate is put into the toughness reinforcing slurry of handling again of enhancing, take out behind the stirring 1min, in relative humidity 85%, maintenance is 2.5 days under 23 ℃ of conditions of temperature, must strengthen the toughness reinforcing light-weight aggregate of handling again; Making the toughness reinforcing slurry of handling again of enhancing is 0.5～1mm high-strength and high-ductility layer at toughness reinforcing pre-treatment light-weight aggregate surface formation one layer thickness, further make toughness reinforcing pre-treatment light-weight aggregate crizzle up, polypropylene fibre is built into network structure in the high-strength and high-ductility layer, improve intensity, toughness and the non-deformability of light-weight aggregate;
2) preparation of high-strength and high-ductility light aggregate concrete:
High-strength and high-ductility light aggregate concrete is made up of water, toughness reinforcing light-weight aggregate, cement, fine aggregate, mineral admixture, high-efficiency water-reducing agent of poly-carboxylic acid, organic imitative steel wire fibre and the polymer emulsion handled again of enhancing; By mass ratio be: water: strengthen the toughness reinforcing light-weight aggregate of handling again: cement: fine aggregate: mineral admixture=1: 3.00: 2.90: 3.80: 0.15, choose water, strengthen toughness reinforcing light-weight aggregate, cement, fine aggregate and the mineral admixture handled again; 0.8～1.65% (quality) by cement consumption chosen high-efficiency water-reducing agent of poly-carboxylic acid, by strengthening the toughness reinforcing 2.5kg/m that handles the light-weight aggregate volume again
3Choose organic imitative steel wire fibre, choose polymer emulsion by 10% (quality) of mineral admixture and cement consumption, the solid content of polymer emulsion is 20% (quality);
In fine aggregate, high-efficiency water-reducing agent of poly-carboxylic acid and polymer emulsion, add earlier and strengthen toughness reinforcing light-weight aggregate, mineral admixture, the cement handled again, add organic imitative steel wire fibre dry mixing 30s again, and then add water and stir, high-strength and high-ductility light aggregate concrete.
Embodiment 6:
The preparation method of high-strength and high-ductility light aggregate concrete, it comprises the steps:
Starting material are prepared:
Light-weight aggregate is: particle diameter 5～16mm, apparent density 1200～1500kg/m
3, tap density 700～1100kg/m
3, cylindrical compress strength 〉=6.5MPa lytag;
Polymer emulsion is: polyvinyl alcohol emulsion, solid content are 60% (quality);
Cement is: the ordinary Portland cement of strength grade 52.5;
Swelling agent is: UEA is a swelling agent, and limited expansion rate is 0.05%;
Polypropylene fibre is: diameter 48 μ m, and length is 19mm;
High-efficiency water-reducing agent of poly-carboxylic acid, water-reducing rate are 20～40%;
Fine aggregate is: river sand or machine-processed sand, fineness modulus are 2.6～3.1;
Mineral admixture is the silicon ash, the specific surface area 20000～30000m of silicon ash
2/ kg;
Organic imitative steel wire fibre is: diameter is 1.0mm, and length is 50mm;
The silicon ash: specific surface area is greater than 20000～30000m
2/ kg.
1) the toughness reinforcing pre-treatment of the enhancing of light-weight aggregate:
(1) the toughness reinforcing pre-treatment of light-weight aggregate: light-weight aggregate is inserted in the sealed vessel, be evacuated to negative pressure 0.10MPa with vacuum pump, injection of polymer emulsion in container then, the solid content of polymer emulsion is 60% (quality), keep leaving standstill 3h under the stable condition of negative pressure, light-weight aggregate after leaving standstill is fished in relative humidity 65%, and maintenance is 3 days under 27 ℃ of conditions of temperature, gets toughness reinforcing pre-treatment light-weight aggregate; Make polymkeric substance in light-weight aggregate, form reticulated structure, improve the toughness of light-weight aggregate, limit the expansion of its crackle;
(2) strengthen toughness reinforcing processing again: strengthen the toughness reinforcing slurry of handling again and form by cement, silicon ash, swelling agent, polypropylene fibre, high-efficiency water-reducing agent of poly-carboxylic acid, polymer emulsion and water; By mass ratio be: water: cement: silicon ash: swelling agent :=1: 3.40: 0.60: 0.15, choose water, cement, silicon ash and swelling agent, 1.65% (quality) by cement consumption chosen high-efficiency water-reducing agent of poly-carboxylic acid, 10% (quality) by cement consumption chosen polymer emulsion, the solid content of polymer emulsion is 60% (quality), is 1.5kg/m by the volumetric usage of cement
3Choose polypropylene fibre; Cement, silicon ash, swelling agent, polypropylene fibre, high-efficiency water-reducing agent of poly-carboxylic acid, polymer emulsion and water stirred to make strengthen the toughness reinforcing slurry of handling again; Toughness reinforcing pre-treatment light-weight aggregate is put into the toughness reinforcing slurry of handling again of enhancing, take out behind the stirring 3min, in relative humidity 95%, maintenance is 3.5 days under 27 ℃ of conditions of temperature, must strengthen the toughness reinforcing light-weight aggregate of handling again; Making the toughness reinforcing slurry of handling again of enhancing is 0.5～1mm high-strength and high-ductility layer at toughness reinforcing pre-treatment light-weight aggregate surface formation one layer thickness, further make toughness reinforcing pre-treatment light-weight aggregate crizzle up, polypropylene fibre is built into network structure in the high-strength and high-ductility layer, improve intensity, toughness and the non-deformability of light-weight aggregate;
2) preparation of high-strength and high-ductility light aggregate concrete:
High-strength and high-ductility light aggregate concrete is made up of water, toughness reinforcing light-weight aggregate, cement, fine aggregate, mineral admixture, high-efficiency water-reducing agent of poly-carboxylic acid, organic imitative steel wire fibre and the polymer emulsion handled again of enhancing; By mass ratio be: water: strengthen the toughness reinforcing light-weight aggregate of handling again: cement: fine aggregate: mineral admixture=1: 3.50: 3.50: 3.95: 0.40, choose water, strengthen toughness reinforcing light-weight aggregate, cement, fine aggregate and the mineral admixture handled again; 1.65% (quality) by cement consumption chosen high-efficiency water-reducing agent of poly-carboxylic acid, by strengthening the toughness reinforcing 9.0kg/m that handles the light-weight aggregate volume again
3Choose organic imitative steel wire fibre, choose polymer emulsion by 20% (quality) of mineral admixture and cement consumption, the solid content of polymer emulsion is 60% (quality);
In fine aggregate, high-efficiency water-reducing agent of poly-carboxylic acid and polymer emulsion, add earlier and strengthen toughness reinforcing light-weight aggregate, mineral admixture, the cement handled again, add organic imitative steel wire fibre dry mixing 60s again, and then add water and stir, high-strength and high-ductility light aggregate concrete.
Claims (6)
1. the preparation method of high-strength and high-ductility light aggregate concrete is characterized in that it comprises the steps:
1) the toughness reinforcing pre-treatment of the enhancing of light-weight aggregate:
(1) the toughness reinforcing pre-treatment of light-weight aggregate: light-weight aggregate is inserted in the sealed vessel, be evacuated to negative pressure 0.05～0.10MPa with vacuum pump, injection of polymer emulsion in container then, the solid content of polymer emulsion is 20～60%, keep leaving standstill 0.5～3h under the stable condition of negative pressure, light-weight aggregate after leaving standstill is fished in relative humidity 60 ± 5%, and maintenance is 1～3 day under 25 ± 2 ℃ of conditions of temperature, gets toughness reinforcing pre-treatment light-weight aggregate;
(2) strengthen toughness reinforcing processing again: by mass ratio be: water: cement: silicon ash: swelling agent :=1: (3.00～3.40): (0.30～0.60): (0.10～0.15), choose water, cement, silicon ash and swelling agent, 0.8～1.65% (quality) by cement consumption chosen high-efficiency water-reducing agent of poly-carboxylic acid, 5～10% (quality) by cement consumption are chosen polymer emulsion, the solid content of polymer emulsion is 20～60%, is 1.0～1.5kg/m by the volumetric usage of cement
3Choose polypropylene fibre; Cement, silicon ash, swelling agent, polypropylene fibre, high-efficiency water-reducing agent of poly-carboxylic acid, polymer emulsion and water stirred to make strengthen the toughness reinforcing slurry of handling again; Toughness reinforcing pre-treatment light-weight aggregate is put into the toughness reinforcing slurry of handling again of enhancing, take out behind stirring 1～3min, in relative humidity 90 ± 5%, maintenance is 2.5～3.5 days under 25 ± 2 ℃ of conditions of temperature, must strengthen the toughness reinforcing light-weight aggregate of handling again;
2) preparation of high-strength and high-ductility light aggregate concrete:
By mass ratio be: water: strengthen the toughness reinforcing light-weight aggregate of handling again: cement: fine aggregate: mineral admixture=1: (3.00～3.50): (2.90～3.50): (3.80～3.95): (0.15～0.40), choose water, strengthen toughness reinforcing light-weight aggregate, cement, fine aggregate and the mineral admixture handled again; 0.8～1.65% (quality) by cement consumption chosen high-efficiency water-reducing agent of poly-carboxylic acid, by strengthening the toughness reinforcing 2.5～9.0kg/m that handles the light-weight aggregate volume again
3Choose organic imitative steel wire fibre, choose polymer emulsion by 10～20% (quality) of mineral admixture and cement consumption, the solid content of polymer emulsion is 20～60%;
In fine aggregate, high-efficiency water-reducing agent of poly-carboxylic acid and polymer emulsion, add earlier and strengthen toughness reinforcing light-weight aggregate, mineral admixture, the cement handled again, add organic imitative steel wire fibre dry mixing 30～60s again, and then add water and stir, high-strength and high-ductility light aggregate concrete.
2. the preparation method of high-strength and high-ductility light aggregate concrete according to claim 1, it is characterized in that: described light-weight aggregate is: particle diameter 5～16mm, apparent density 1200～1500kg/m
3, tap density 700～1100kg/m
3, cylindrical compress strength 〉=6.5MPa leca, haydites of book structure or lytag.
3. the preparation method of high-strength and high-ductility light aggregate concrete according to claim 1, it is characterized in that: described polymer emulsion is benzene emulsion or polyvinyl alcohol emulsion.
4. the preparation method of high-strength and high-ductility light aggregate concrete according to claim 1, it is characterized in that: the diameter of described polypropylene fibre is 20～48 μ m, and length is 3～19mm.
5. the preparation method of high-strength and high-ductility light aggregate concrete according to claim 1 is characterized in that: described mineral admixture is any one or the two kinds of mixing in silicon ash, the II level flyash, and two kinds is any proportioning when mixing; Specific surface area 20000～the 30000m of silicon ash
2/ kg; Water demand ratio≤105% of II level flyash.
6. the preparation method of high-strength and high-ductility light aggregate concrete according to claim 1, it is characterized in that: the diameter of described organic imitative steel wire fibre is 0.5mm～1.0mm, length is 30～50mm.
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Inventor after: Ding Qingjun Inventor after: Lv Linnv Inventor after: He Yongjia Inventor after: Wang Fazhou Inventor after: Lin Qing Inventor after: Chen Zaowen Inventor after: Hu Shuguang Inventor after: Xie Xianqi Inventor after: Deng Liming Inventor after: Huang Xiaoxia Inventor after: Tian Yaogang Inventor after: Wang Xiaolei Inventor after: Huang Xiulin Inventor after: Tian Kun Inventor before: Ding Qingjun Inventor before: Lin Qing Inventor before: Chen Zaowen Inventor before: Hu Shuguang Inventor before: Tian Yaogang Inventor before: Wang Xiaolei Inventor before: Huang Xiulin Inventor before: Tian Kun Inventor before: Lv Linnv Inventor before: He Yongjia Inventor before: Wang Fazhou |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: DING QINGJUN HU SHUGUANG TIAN YAOGANG WANG XIAOLEI HUANG XIULIN TIAN LV LINNV HE YONGJIA WANG FAZHOU LIN QING CHEN ZAOWEN TO: DING QINGJUN HU SHUGUANG XIE XIANQI DENG LIMING HUANG XIAOXIA TIAN YAOGANG WANG XIAOLEI HUANG XIULIN TIAN LV LINNV HE YONGJIA WANG FAZHOU LIN QING CHEN ZAOWEN |