CN113896462A - Method for strengthening cold-bending thin-wall steel column based on geopolymer foam concrete - Google Patents
Method for strengthening cold-bending thin-wall steel column based on geopolymer foam concrete Download PDFInfo
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- CN113896462A CN113896462A CN202111187696.XA CN202111187696A CN113896462A CN 113896462 A CN113896462 A CN 113896462A CN 202111187696 A CN202111187696 A CN 202111187696A CN 113896462 A CN113896462 A CN 113896462A
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- 239000011381 foam concrete Substances 0.000 title claims abstract description 75
- 229920000876 geopolymer Polymers 0.000 title claims abstract description 72
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 67
- 239000010959 steel Substances 0.000 title claims abstract description 67
- 238000005452 bending Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005728 strengthening Methods 0.000 title claims abstract description 22
- 239000000843 powder Substances 0.000 claims abstract description 77
- 238000003756 stirring Methods 0.000 claims abstract description 72
- 239000004567 concrete Substances 0.000 claims abstract description 55
- 239000004088 foaming agent Substances 0.000 claims abstract description 52
- 239000002699 waste material Substances 0.000 claims abstract description 39
- 239000002585 base Substances 0.000 claims abstract description 37
- 238000010276 construction Methods 0.000 claims abstract description 31
- 239000002002 slurry Substances 0.000 claims abstract description 30
- 239000012190 activator Substances 0.000 claims abstract description 29
- 239000003513 alkali Substances 0.000 claims abstract description 28
- 238000005187 foaming Methods 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 26
- 239000004743 Polypropylene Substances 0.000 claims abstract description 21
- 239000000835 fiber Substances 0.000 claims abstract description 21
- 239000010881 fly ash Substances 0.000 claims abstract description 21
- -1 polypropylene Polymers 0.000 claims abstract description 21
- 229920001155 polypropylene Polymers 0.000 claims abstract description 21
- 239000002893 slag Substances 0.000 claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 21
- 239000011159 matrix material Substances 0.000 claims abstract description 18
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 24
- 230000003068 static effect Effects 0.000 claims description 19
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 16
- 235000019353 potassium silicate Nutrition 0.000 claims description 16
- 238000002360 preparation method Methods 0.000 claims description 16
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 16
- 235000021120 animal protein Nutrition 0.000 claims description 13
- 239000011449 brick Substances 0.000 claims description 8
- 239000000919 ceramic Substances 0.000 claims description 8
- 239000004927 clay Substances 0.000 claims description 8
- 239000011521 glass Substances 0.000 claims description 8
- 239000004615 ingredient Substances 0.000 claims description 8
- 239000011812 mixed powder Substances 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 claims description 5
- 238000009413 insulation Methods 0.000 abstract description 6
- 239000012634 fragment Substances 0.000 description 7
- 230000003020 moisturizing effect Effects 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 239000010813 municipal solid waste Substances 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/006—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 mineral polymers, e.g. geopolymers of the Davidovits type
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/88—Insulating elements for both heat and sound
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C3/00—Structural elongated elements designed for load-supporting
- E04C3/30—Columns; Pillars; Struts
- E04C3/36—Columns; Pillars; Struts of materials not covered by groups E04C3/32 or E04C3/34; of a combination of two or more 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/2038—Resistance against physical degradation
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/26—Corrosion of reinforcement resistance
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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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/52—Sound-insulating 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
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Abstract
The invention discloses a method for strengthening a cold-bending thin-wall steel column based on geopolymer foam concrete, which specifically comprises the following steps: constructing a surrounding and connecting cylinder matrix by utilizing cold-bent thin-wall steel; uniformly stirring the slag powder and the fly ash, then adding the construction waste powder and stirring to obtain a powder base material; adding an alkali activator and water into a concrete mixer for stirring, and then sequentially adding polypropylene short fibers, a powder base material and a foaming agent for stirring in batches to obtain geopolymer foam concrete slurry; pouring geopolymer foam concrete slurry into the column base body; standing and foaming; curing to obtain a geopolymer foam concrete reinforced cold-bending thin-wall steel column; the invention adopts the cold-formed thin-wall steel-geopolymer foam concrete column as a new combined member in the light steel and light concrete combined structure, can achieve good sound insulation and noise reduction performance, can eliminate the hollowing sound of the existing light steel structure, and can meet the requirements of the national building sound insulation standard.
Description
Technical Field
The invention relates to the technical field of cold-bending thin-wall steel structures, in particular to a method for strengthening a cold-bending thin-wall steel column based on geopolymer foam concrete.
Background
Along with the development of the building industry, a plurality of problems are highlighted, and most obvious problems are that the resource consumption is too large, the building garbage is too much, and the environmental pollution is too serious. Furthermore, green buildings and fabricated buildings have become more important roles in the development of the construction industry, especially steel structures.
The cold-formed thin-walled steel has the highest strength-weight ratio in the current building materials, has the advantages of economy, light weight, non-combustibility, recyclability and the like, and has been used for building construction for a long time. However, the existing cold-bending thin-wall type steel structure has the defects of weaker wind resistance and earthquake resistance, poorer heat preservation, heat insulation, sound insulation and noise reduction performances, and three buckling failure modes of local buckling, distortion buckling and overall buckling easily occur in the actual use process because the steel thickness is thinner and the width-thickness ratio of the cross section is relatively larger. Therefore, the structure of the concrete and cold-formed thin-walled steel assembly is proposed to mutually enhance the effect.
Because the cold-formed thin-wall section steel lightweight concrete combined wall structure in the prior art has lower bearing capacity, the cold-formed thin-wall section steel lightweight concrete combined wall structure is only suitable for multi-storey villas and other low-rise residential building systems in China. Therefore, a cold-formed thin-wall steel column with high bearing capacity is needed to enhance the bearing capacity of the cold-formed thin-wall steel lightweight concrete composite wall.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method for strengthening a cold-bending thin-wall steel column based on geopolymer foam concrete.
The technical scheme of the invention is as follows: a method for strengthening cold-bending thin-wall steel column based on geopolymer foam concrete specifically comprises the following steps:
s1: constructing a cylindrical matrix
Constructing a surrounding and connecting cylinder matrix by utilizing cold-bent thin-wall steel;
s2: preparation of geopolymer foam concrete
S2-1: ingredients
According to the parts by weight: 190-215 parts of slag powder, 105-135 parts of fly ash, 40-73 parts of construction waste powder, 11-15 parts of polypropylene short fiber, 64-88 parts of alkali activator, 5-11 parts of foaming agent and 150-182 parts of water;
s2-2: preparation of
Uniformly stirring the slag powder and the fly ash in a mixer, and then adding the construction waste powder and stirring to obtain a powder base material;
adding an alkali activator and water into a concrete mixer for stirring, and then sequentially adding polypropylene short fibers, a powder base material and a foaming agent for stirring in batches to obtain geopolymer foam concrete slurry;
s3: pouring of the slurry
Pouring geopolymer foam concrete slurry into the column base body;
s4: static foaming
Standing and foaming for 1-1.5 days at the temperature of 20-22 ℃;
s4: maintaining
And curing the concrete after static foaming for 7-13 d to obtain the geopolymer foam concrete reinforced cold-bending thin-wall steel column.
Further, the construction waste powder of S2-1 is specifically clay bricks, ceramic fragments and waste glass which are mixed according to the mass percentage of 3-5: 1: 1.7-2 and then crushed into mixed powder with the fineness of 0.08 mm; utilize building rubbish powder can realize waste utilization on the one hand, on the other hand can strengthen compressive strength effectively.
Further, the alkali-activator of S2-1 specifically includes 65-73% of water glass and 27-35% of sodium hydroxide.
Further, the water glass has a modulus of 2.4 and a solid content of 40.2%.
Further, the S2-1 foaming agent specifically comprises 72-80% of animal protein type foaming agent and 20-28% of hydrogen peroxide.
Further, the S2-1 foaming agent specifically comprises 55-65% of an animal protein type foaming agent and 35-45% of a plant type foaming agent.
Further, the specific step of S2-2 is: stirring the slag powder and the fly ash in a mixer at a rotating speed of 260-300 rpm for 15-20 min, and then adding the construction waste powder and stirring at a rotating speed of 120-200 rpm for 5-8 min to obtain a powder base material;
adding an alkali activator and water into a concrete mixer, stirring for 3-5 min at a rotating speed of 600-800 rpm, adding polypropylene short fibers into the concrete mixer, stirring for 2min at a rotating speed of 300-500 rpm, adding a powder base material into the concrete mixer, stirring for 3-5 min at a rotating speed of 30-60 rpm, and stirring for 5-8 min at a rotating speed of 200-360 rpm; and adding the foaming agent into a concrete mixer, and stirring for 35-60 s at the rotating speed of 500-600 rpm to obtain the geopolymer foam concrete slurry.
Further, the specific step of S2-2 is: stirring the slag powder, the fly ash and the construction waste powder in a mixer at a rotating speed of 260-300 rpm for 15-20 min to obtain a powder base material;
adding an alkali activator, water and polypropylene short fibers into a concrete mixer, stirring for 5-8 min at a rotating speed of 400-600 rpm, adding a powder base material into the concrete mixer, stirring for 2-3 min at a rotating speed of 150-200 rpm, and stirring for 3-5 min at a rotating speed of 400-500 rpm; and adding the foaming agent into a concrete mixer, and stirring for 30-50 s at the rotating speed of 300-500 rpm to obtain the geopolymer foam concrete slurry.
Further, the curing in S4 is specifically: covering the exposed part of the concrete after static foaming, and carrying out moisture preservation and maintenance for 7-13 d to obtain the geopolymer foam concrete reinforced cold-bending thin-wall steel column.
Compared with the prior art, the invention has the beneficial effects that: the invention adopts the cold-formed thin-wall steel-geopolymer foam concrete column as a new combined member in the light steel and light concrete combined structure, can achieve good sound insulation and noise reduction performance, can eliminate the hollowing sound of the existing light steel structure, and can meet the requirements of the national building sound insulation standard; the reinforced cold-bending thin-wall steel column based on the geopolymer foam concrete has good performances in waste utilization, energy conservation, environmental protection, heat preservation, integrated assembly construction, lateral rigidity resistance, integrity and seismic performance.
Detailed Description
Example 1:
a method for strengthening cold-bending thin-wall steel column based on geopolymer foam concrete specifically comprises the following steps:
s1: constructing a cylindrical matrix
Constructing a surrounding and connecting cylinder matrix by utilizing cold-bent thin-wall steel;
s2: preparation of geopolymer foam concrete
S2-1: ingredients
According to the parts by weight: 190 parts of slag powder, 105 parts of fly ash, 40 parts of construction waste powder, 11 parts of polypropylene short fiber, 64 parts of alkali activator, 5 parts of foaming agent and 150 parts of water; the construction waste powder is specifically a mixed powder obtained by mixing clay bricks, ceramic fragments and waste glass according to the mass percentage of 3:1:1.7 and then crushing the mixture into 0.08mm in fineness;
the alkali activator specifically comprises 65% of water glass and 35% of sodium hydroxide; the modulus of the water glass is 2.4, and the solid content is 40.2%;
the foaming agent specifically comprises 72% of animal protein type foaming agent and 28% of hydrogen peroxide;
s2-2: preparation of
Stirring the slag powder and the fly ash in a mixer at the rotating speed of 300 revolutions per minute for 15min, then adding the construction waste powder and stirring at the rotating speed of 200 revolutions per minute for 5min to obtain a powder base material;
adding an alkali activator and water into a concrete mixer, stirring for 3min at the rotating speed of 800 rpm, adding polypropylene short fibers into the concrete mixer, stirring for 2min at the rotating speed of 300 rpm, adding a powder base material into the concrete mixer, stirring for 3min at the rotating speed of 60 rpm, and stirring for 5min at the rotating speed of 360 rpm; adding the foaming agent into a concrete mixer, and stirring for 35s at the rotating speed of 600 revolutions per minute to obtain geopolymer foam concrete slurry;
s3: pouring of the slurry
Pouring geopolymer foam concrete slurry into the column base body;
s4: static foaming
Standing and foaming for 1d at the temperature of 20 ℃;
s4: maintaining
Covering the exposed part of the concrete after static foaming, and obtaining the geopolymer foam concrete reinforced cold-bending thin-wall steel column after moisturizing and curing for 7 d.
Example 2:
a method for strengthening cold-bending thin-wall steel column based on geopolymer foam concrete specifically comprises the following steps:
s1: constructing a cylindrical matrix
Constructing a surrounding and connecting cylinder matrix by utilizing cold-bent thin-wall steel;
s2: preparation of geopolymer foam concrete
S2-1: ingredients
According to the parts by weight: 200 parts of slag powder, 120 parts of fly ash, 60 parts of construction waste powder, 13 parts of polypropylene short fiber, 70 parts of alkali activator, 8 parts of foaming agent and 162 parts of water; the construction waste powder is specifically a mixed powder obtained by mixing clay bricks, ceramic fragments and waste glass according to the mass percentage of 4:1:1.8 and then crushing the mixture into 0.08mm in fineness;
the alkali activator specifically comprises 70% of water glass and 230% of sodium hydroxide; the modulus of the water glass is 2.4, and the solid content is 40.2%;
the foaming agent specifically comprises 75% of animal protein type foaming agent and 25% of hydrogen peroxide;
s2-2: preparation of
Stirring the slag powder and the fly ash in a mixer at the rotating speed of 280 revolutions per minute for 18min, and then adding the construction waste powder and stirring at the rotating speed of 150 revolutions per minute for 7min to obtain a powder base material;
adding an alkali activator and water into a concrete mixer, stirring for 4min at the rotating speed of 700 rpm, adding polypropylene short fibers into the concrete mixer, stirring for 2min at the rotating speed of 400 rpm, adding a powder base material into the concrete mixer, stirring for 4min at the rotating speed of 50 rpm, and stirring for 6min at the rotating speed of 300 rpm; adding the foaming agent into a concrete mixer, and stirring for 50s at the rotating speed of 550 revolutions per minute to obtain geopolymer foam concrete slurry;
s3: pouring of the slurry
Pouring geopolymer foam concrete slurry into the column base body;
s4: static foaming
Standing and foaming for 1.5 days at 20 ℃;
s4: maintaining
Covering the exposed part of the concrete after static foaming, and performing moisture preservation and maintenance for 10 days to obtain the geopolymer foam concrete reinforced cold-bending thin-wall steel column.
Example 3:
a method for strengthening cold-bending thin-wall steel column based on geopolymer foam concrete specifically comprises the following steps:
s1: constructing a cylindrical matrix
Constructing a surrounding and connecting cylinder matrix by utilizing cold-bent thin-wall steel;
s2: preparation of geopolymer foam concrete
S2-1: ingredients
According to the parts by weight: 215 parts of slag powder, 135 parts of fly ash, 73 parts of construction waste powder, 15 parts of polypropylene short fiber, 88 parts of alkali activator, 11 parts of foaming agent and 182 parts of water; the construction waste powder is specifically a mixed powder obtained by mixing clay bricks, ceramic fragments and waste glass according to the mass ratio of 5:1:2 and then crushing the mixture into 0.08mm in fineness;
the alkali activator specifically comprises 73% of water glass and 27% of sodium hydroxide; the modulus of the water glass is 2.4, and the solid content is 40.2%;
the foaming agent specifically comprises 80% of animal protein type foaming agent and 20% of hydrogen peroxide;
s2-2: preparation of
Stirring the slag powder and the fly ash in a mixer at the rotating speed of 260 revolutions per minute for 20min, then adding the construction waste powder and stirring at the rotating speed of 120 revolutions per minute for 8min to obtain a powder base material;
adding an alkali activator and water into a concrete mixer, stirring for 5min at the rotating speed of 600 revolutions per minute, adding polypropylene short fibers into the concrete mixer, stirring for 2min at the rotating speed of 500 revolutions per minute, adding a powder base material into the concrete mixer, stirring for 5min at the rotating speed of 30 revolutions per minute, and stirring for 8min at the rotating speed of 200 revolutions per minute; adding the foaming agent into a concrete mixer, and stirring for 60s at the rotating speed of 500 rpm to obtain geopolymer foam concrete slurry;
s3: pouring of the slurry
Pouring geopolymer foam concrete slurry into the column base body;
s4: static foaming
Standing and foaming at 22 ℃ for 1.5 days;
s4: maintaining
Covering the exposed part of the concrete after static foaming, and obtaining the geopolymer foam concrete reinforced cold-bending thin-wall steel column after moisturizing and curing for 13 d.
Example 4: the difference from example 1 is: the S2-1 foaming agent specifically comprises 55% of animal protein type foaming agent and 45% of plant type foaming agent.
Example 5: the difference from example 1 is: the S2-1 foaming agent specifically comprises 60% of animal protein type foaming agent and 40% of plant type foaming agent.
Example 6: the difference from example 1 is: the S2-1 foaming agent specifically comprises 65% of animal protein type foaming agent and 35% of plant type foaming agent.
Example 7:
a method for strengthening cold-bending thin-wall steel column based on geopolymer foam concrete specifically comprises the following steps:
s1: constructing a cylindrical matrix
Constructing a surrounding and connecting cylinder matrix by utilizing cold-bent thin-wall steel;
s2: preparation of geopolymer foam concrete
S2-1: ingredients
According to the parts by weight: 190 parts of slag powder, 105 parts of fly ash, 40 parts of construction waste powder, 11 parts of polypropylene short fiber, 64 parts of alkali activator, 5 parts of foaming agent and 150 parts of water; the construction waste powder is specifically a mixed powder obtained by mixing clay bricks, ceramic fragments and waste glass according to the mass percentage of 3:1:1.7 and then crushing the mixture into 0.08mm in fineness;
the alkali activator specifically comprises 65% of water glass and 27% of sodium hydroxide; the modulus of the water glass is 2.4, and the solid content is 40.2%;
the foaming agent specifically comprises 72% of animal protein type foaming agent and 28% of hydrogen peroxide;
s2-2: preparation of
Stirring the slag powder, the fly ash and the construction waste powder in a mixer at the rotating speed of 260 revolutions per minute for 20min to obtain a powder base material;
adding alkali activator, water and polypropylene short fiber into a concrete mixer, stirring for 8min at the rotating speed of 400 rpm, adding the powder base material into the concrete mixer, stirring for 3min at the rotating speed of 150 rpm, and stirring for 5min at the rotating speed of 400 rpm; adding the foaming agent into a concrete mixer, and stirring for 50s at the rotating speed of 300 revolutions per minute to obtain geopolymer foam concrete slurry;
s3: pouring of the slurry
Pouring geopolymer foam concrete slurry into the column base body;
s4: static foaming
Standing and foaming for 1d at the temperature of 20 ℃;
s4: maintaining
Covering the exposed part of the concrete after static foaming, and obtaining the geopolymer foam concrete reinforced cold-bending thin-wall steel column after moisturizing and curing for 7 d.
Example 8:
a method for strengthening cold-bending thin-wall steel column based on geopolymer foam concrete specifically comprises the following steps:
s1: constructing a cylindrical matrix
Constructing a surrounding and connecting cylinder matrix by utilizing cold-bent thin-wall steel;
s2: preparation of geopolymer foam concrete
S2-1: ingredients
According to the parts by weight: 210 parts of slag powder, 109 parts of fly ash, 50 parts of construction waste powder, 13 parts of polypropylene short fiber, 72 parts of alkali activator, 8 parts of foaming agent and 162 parts of water; the construction waste powder is specifically a mixed powder obtained by mixing clay bricks, ceramic fragments and waste glass according to the mass percentage of 4:1:1.9 and then crushing the mixture into 0.08mm in fineness;
the alkali activator specifically comprises 71% of water glass and 29% of sodium hydroxide; the modulus of the water glass is 2.4, and the solid content is 40.2%;
the foaming agent specifically comprises 75% of animal protein type foaming agent and 25% of hydrogen peroxide;
s2-2: preparation of
Stirring the slag powder, the fly ash and the construction waste powder in a mixer at the rotating speed of 280 revolutions per minute for 17min to obtain a powder base material;
adding alkali activator, water and polypropylene short fiber into a concrete mixer, stirring for 6min at the rotating speed of 500 rpm, adding the powder base material into the concrete mixer, stirring for 2.5min at the rotating speed of 180 rpm, and stirring for 4min at the rotating speed of 450 rpm; adding the foaming agent into a concrete mixer, and stirring for 40s at the rotating speed of 400 rpm to obtain geopolymer foam concrete slurry;
s3: pouring of the slurry
Pouring geopolymer foam concrete slurry into the column base body;
s4: static foaming
Standing and foaming for 1.5 days at 21 ℃;
s4: maintaining
Covering the exposed part of the concrete after static foaming, and performing moisture preservation and maintenance for 10 days to obtain the geopolymer foam concrete reinforced cold-bending thin-wall steel column.
Example 9:
a method for strengthening cold-bending thin-wall steel column based on geopolymer foam concrete specifically comprises the following steps:
s1: constructing a cylindrical matrix
Constructing a surrounding and connecting cylinder matrix by utilizing cold-bent thin-wall steel;
s2: preparation of geopolymer foam concrete
S2-1: ingredients
According to the parts by weight: 215 parts of slag powder, 135 parts of fly ash, 73 parts of construction waste powder, 15 parts of polypropylene short fiber, 88 parts of alkali activator, 11 parts of foaming agent and 182 parts of water; the construction waste powder is specifically a mixed powder obtained by mixing clay bricks, ceramic fragments and waste glass according to the mass ratio of 5:1:2 and then crushing the mixture into 0.08mm in fineness;
the alkali activator specifically comprises 73% of water glass and 27% of sodium hydroxide; the modulus of the water glass is 2.4, and the solid content is 40.2%;
the foaming agent specifically comprises 80% of animal protein type foaming agent and 20% of hydrogen peroxide;
s2-2: preparation of
Stirring the slag powder, the fly ash and the construction waste powder in a mixer at the rotating speed of 300 revolutions per minute for 20min to obtain a powder base material;
adding alkali activator, water and polypropylene short fiber into a concrete mixer, stirring for 8min at the rotating speed of 600 rpm, adding the powder base material into the concrete mixer, stirring for 3min at the rotating speed of 200 rpm, and stirring for 5min at the rotating speed of 500 rpm; adding the foaming agent into a concrete mixer, and stirring for 50s at the rotating speed of 500 revolutions per minute to obtain geopolymer foam concrete slurry;
s3: pouring of the slurry
Pouring geopolymer foam concrete slurry into the column base body;
s4: static foaming
Standing and foaming at 22 ℃ for 1.5 days;
s4: maintaining
Covering the exposed part of the concrete after static foaming, and obtaining the geopolymer foam concrete reinforced cold-bending thin-wall steel column after moisturizing and curing for 13 d.
Experimental example: three groups of geopolymer foam concrete reinforced cold-bending thin-wall steel columns of 40mm multiplied by 80mm multiplied by 500mm are prepared by the methods of the embodiments 1 to 9 respectively for performance test. The column body base body is prepared by oppositely arranging two groups of C-shaped cold-bending thin-wall steel openings. Three groups of foam concrete reinforced cold-bending thin-wall steel columns and unfilled column matrixes are set as two different control groups; the specific performance test structure is shown in table 1;
table 1: performance of geopolymer foam concrete reinforced cold-bending thin-wall steel column prepared by the methods of examples 1 to 9 and the performance of the control group
And (4) conclusion: the geopolymer foam concrete reinforced cold-bending thin-wall steel column prepared by the methods in the embodiments 1 to 9 can improve the bearing capacity by times compared with a cylinder matrix which is not filled, and has better bearing capacity compared with the foam concrete reinforced cold-bending thin-wall steel column; compared with the traditional foam concrete, the geopolymer foam concrete has lower corrosivity to steel and saves more energy than a cement base, so the geopolymer foam concrete reinforced cold-bending thin-wall steel column can become a better cold-bending thin-wall steel column.
Claims (10)
1. A method for strengthening cold-bending thin-wall steel column based on geopolymer foam concrete is characterized by comprising the following steps:
s1: constructing a cylindrical matrix
Constructing a surrounding and connecting cylinder matrix by utilizing cold-bent thin-wall steel;
s2: preparation of geopolymer foam concrete
S2-1: ingredients
According to the parts by weight: 190-215 parts of slag powder, 105-135 parts of fly ash, 40-73 parts of construction waste powder, 11-15 parts of polypropylene short fiber, 64-88 parts of alkali activator, 5-11 parts of foaming agent and 150-182 parts of water;
s2-2: preparation of
Uniformly stirring the slag powder and the fly ash in a mixer, and then adding the construction waste powder and stirring to obtain a powder base material;
adding an alkali activator and water into a concrete mixer for stirring, and then sequentially adding polypropylene short fibers, a powder base material and a foaming agent for stirring in batches to obtain geopolymer foam concrete slurry;
s3: pouring of the slurry
Pouring geopolymer foam concrete slurry into the column base body;
s4: static foaming
Standing and foaming for 1-1.5 days at the temperature of 20-22 ℃;
s4: maintaining
And curing the concrete after static foaming for 7-13 d to obtain the geopolymer foam concrete reinforced cold-bending thin-wall steel column.
2. The method for strengthening and cold-bending the thin-walled steel column based on the geopolymer foam concrete as claimed in claim 1, wherein the construction waste powder of S2-1 is a mixture of clay bricks, ceramic chips and waste glass in a mass ratio of 3-5: 1: 1.7-2, and the mixture is crushed into a mixed powder with a fineness of 0.08 mm.
3. The method for strengthening cold-bending thin-walled steel columns based on geopolymer foam concrete as claimed in claim 1, wherein the alkali activator of S2-1 comprises 65-73% water glass and 27-35% sodium hydroxide.
4. The method for strengthening cold-bending thin-walled steel column based on geopolymer foam concrete as claimed in claim 3, wherein the water glass has a modulus of 2.4 and a solid content of 40.2%.
5. The method for strengthening the cold-bending thin-walled steel column based on the geopolymer foam concrete as claimed in claim 1, wherein the S2-1 foaming agent specifically comprises 72-80% of an animal protein type foaming agent and 20-28% of hydrogen peroxide.
6. The method for strengthening cold-bending thin-walled steel columns based on geopolymer foam concrete as claimed in claim 1, wherein the foaming agent S2-1 comprises 55-65% animal protein type foaming agent and 35-45% plant type foaming agent.
7. The method for strengthening the cold-bending thin-walled steel column based on the geopolymer foam concrete as claimed in claim 1, wherein the step S2-2 comprises the following steps: stirring the slag powder and the fly ash in a mixer at a rotating speed of 260-300 rpm for 15-20 min, and then adding the construction waste powder and stirring at a rotating speed of 120-200 rpm for 5-8 min to obtain a powder base material;
adding an alkali activator and water into a concrete mixer, stirring for 3-5 min at a rotating speed of 600-800 rpm, adding polypropylene short fibers into the concrete mixer, stirring for 2min at a rotating speed of 300-500 rpm, adding a powder base material into the concrete mixer, stirring for 3-5 min at a rotating speed of 30-60 rpm, and stirring for 5-8 min at a rotating speed of 200-360 rpm; and adding the foaming agent into a concrete mixer, and stirring for 35-60 s at the rotating speed of 500-600 rpm to obtain the geopolymer foam concrete slurry.
8. The method for strengthening cold-bending thin-walled steel column based on geopolymer foam concrete as claimed in claim 1, wherein the step S2-2 is as follows: stirring the slag powder, the fly ash and the construction waste powder in a mixer at a rotating speed of 260-300 rpm for 15-20 min to obtain a powder base material;
adding an alkali activator, water and polypropylene short fibers into a concrete mixer, stirring for 5-8 min at a rotating speed of 400-600 rpm, adding a powder base material into the concrete mixer, stirring for 2-3 min at a rotating speed of 150-200 rpm, and stirring for 3-5 min at a rotating speed of 400-500 rpm; and adding the foaming agent into a concrete mixer, and stirring for 30-50 s at the rotating speed of 300-500 rpm to obtain the geopolymer foam concrete slurry.
9. The method for strengthening cold-bending thin-walled steel columns based on geopolymer foam concrete as claimed in claim 1, wherein the curing of S4 is specifically: covering the exposed part of the concrete after static foaming, and carrying out moisture preservation and maintenance for 7-13 d to obtain the geopolymer foam concrete reinforced cold-bending thin-wall steel column.
10. The method for strengthening cold-bending thin-walled steel columns based on geopolymer foam concrete as claimed in claim 1, wherein the curing of S4 is specifically: covering the exposed part of the concrete after static foaming, and carrying out moisture preservation and maintenance for 7-13 d to obtain the geopolymer foam concrete reinforced cold-bending thin-wall steel column.
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