CN112321237A - Solid waste fly ash high-strength foam concrete and preparation method thereof - Google Patents

Solid waste fly ash high-strength foam concrete and preparation method thereof Download PDF

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Publication number
CN112321237A
CN112321237A CN202011302454.6A CN202011302454A CN112321237A CN 112321237 A CN112321237 A CN 112321237A CN 202011302454 A CN202011302454 A CN 202011302454A CN 112321237 A CN112321237 A CN 112321237A
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China
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parts
fly ash
foam concrete
solid waste
strength
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CN202011302454.6A
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Chinese (zh)
Inventor
郝贠洪
秦立达
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Inner Mongolia University of Technology
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Inner Mongolia University of Technology
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Priority to CN202011302454.6A priority Critical patent/CN112321237A/en
Publication of CN112321237A publication Critical patent/CN112321237A/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
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/02—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding chemical blowing agents
    • 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
    • C04B28/04—Portland 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
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
    • 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
    • C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
    • C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention belongs to the technical field of building materials, and relates to solid waste fly ash high-strength foam concrete which is prepared from the following components in parts by weight: 450-500 parts of ordinary portland cement (42.5), 200-250 parts of fly ash, 550-850 parts of admixture, 280-320 parts of water, 1.5-2 parts of polypropylene fiber, 5-8 parts of polycarboxylic acid high-efficiency water reducing agent, 10-15 parts of foaming agent, 0.3-0.5 part of foam stabilizer and 0-0.3 part of catalyst. The preparation method comprises the following steps: (1) weighing the cementing material, the admixture, the fiber and the like, and uniformly stirring to obtain a mixed dry material; (2) mixing a polycarboxylic acid high-efficiency water reducing agent with water, adding the mixed dry material, and fully stirring to obtain slurry; (3) adding hydrogen peroxide, hydroxypropyl methylcellulose and manganese dioxide in sequence, and stirring at a high speed to obtain foam concrete slurry; (4) and pouring and forming the foam concrete slurry, demolding and maintaining. The foam concrete prepared by using the industrial waste fly ash has the density of 1400-1500 kg/m3The compression strength is 20-26 Mpa, the heat conductivity coefficient is 0.221W/(m.K) -0.249W/(m.K), and the material has the advantages of environmental protection, high strength, crack resistance, heat preservation, heat insulation and the like.

Description

Solid waste fly ash high-strength foam concrete and preparation method thereof
[ technical field ] A method for producing a semiconductor device
The invention belongs to the technical field of building materials, and particularly relates to solid waste fly ash high-strength foam concrete and a preparation method thereof.
[ background of the invention ]
In recent years, the contradiction between building energy consumption and energy environment restriction is increasingly prominent, China starts to greatly implement the building energy-saving policy, advocates environment-friendly and resource-saving green buildings and develops low-carbon economy. In coal and electricity production areas such as Shanxi, inner Mongolia and Xinjiang, the yield of the fly ash is high, the digestion capacity is limited, the utilization rate of the fly ash is very low, and the rest parts are directly treated in a landfill mode, so that the soil, underground water, atmospheric environment and the like are seriously damaged. How to better utilize the fly ash in the underdeveloped areas is an important and to-be-broken problem for the fly ash industry in recent years.
The foam concrete is used as a novel building energy-saving material with light weight, heat preservation, sound insulation, earthquake resistance and fire resistance, and is widely applied to the engineering fields of wall heat preservation, light boards, fireproof core doors and the like. However, the foam concrete is not produced into structural members in the field of building engineering because of its low strength, and the application of the foam concrete is limited to some extent. Therefore, how to improve the strength of the foam concrete is a key to solve the transformation of the foam concrete from a non-structural member to a structural member.
For the building industry with huge energy consumption, how to utilize industrial waste residue fly ash to prepare foam concrete with more excellent performance is expected to achieve the target of high strength and low heat conductivity coefficient, and the foam concrete has important ecological, economic and social benefits.
[ summary of the invention ]
The invention aims to provide solid waste fly ash high-strength foam concrete which has high strength, low heat conductivity coefficient and no combustion, can be used for manufacturing bearing members in multi-layer and low-layer building structures, and realizes the integration of bearing and heat preservation of the structural members.
The invention adopts the following technical scheme: the solid waste fly ash high-strength foam concrete is prepared from the following components in parts by weight: 450-500 parts of ordinary portland cement (42.5), 200-250 parts of fly ash, 550-850 parts of admixture, 280-320 parts of water, 1.5-2 parts of polypropylene fiber, 5-8 parts of polycarboxylic acid high-efficiency water reducing agent, 10-15 parts of foaming agent, 0.3-0.5 part of foam stabilizer and 0-0.3 part of catalyst.
Further, the fly ash is II-grade fly ash and F-class fly ash.
Further, the admixture comprises the following components in parts by weight: 50-255 parts of quartz sand, 390-590 parts of quartz powder and 0-190 parts of river sand.
Further, the fineness of the quartz sand is 40-70 meshes.
Further, the fineness of the quartz powder is 200 meshes.
Furthermore, the fineness modulus of the river sand is 3.0-2.3.
Further, the polypropylene fiber length is 12 mm.
Further, the high-efficiency water reducing agent is a JSM-1 type polycarboxylic acid water reducing agent, and the water reducing rate is 37%.
Further, the foaming agent is industrial hydrogen peroxide H2O2The content is 30 percent.
Further, the foam stabilizer is hydroxypropyl methyl cellulose, the fineness of the foam stabilizer is not more than 80 meshes, and the viscosity of the foam stabilizer is 20 ten thousand.
Further, the catalyst is manganese dioxide.
The invention discloses a preparation method of solid waste fly ash high-strength foam concrete, which comprises the following steps:
step one, weighing ordinary portland cement, fly ash, an admixture and polypropylene fibers according to a mixing proportion, pouring the ordinary portland cement, the fly ash, the admixture and the polypropylene fibers into a stirring instrument, and stirring for 3-5 min to obtain a uniformly mixed dry material;
mixing the polycarboxylic acid high-efficiency water reducing agent with water, adding the mixture into a stirring instrument, and stirring the mixture for 10min at the speed of 100-200 r/min to obtain slurry;
sequentially adding hydrogen peroxide, hydroxypropyl methylcellulose and manganese dioxide, and stirring at the speed of 300-400 r/min for 1min to obtain foam concrete slurry;
and step four, pouring and molding the foam concrete slurry, standing for 24 hours, then demolding, and naturally curing for 28 days.
The invention has the beneficial effects that:
1. the dry density of the foam concrete prepared by the invention is 1462kg/m3～1532kg/m3The compressive strength is 20-26 Mpa, which is much higher than the strength (5.5-10 Mpa) corresponding to the density grade in foam concrete application technical Specification (JGJ/T341-2014), and the method can be used for manufacturing the bearing member of a multi-layer and low-layer building structure and realizes the conversion of the foam concrete from a non-structural member to a structural member in the engineering field.
2. The foam concrete prepared by the invention has the thermal conductivity coefficient of 0.221W/(m.K) -0.249W/(m.K), which is far less than the thermal conductivity coefficient of 1.28W/(m.K) of common concrete, and can be used as a heat-insulating material. In a multi-storey and low-rise building, the bearing capacity requirement can be met, the self-heat-preservation function of the structure can be met, the bearing and heat-preservation integration of the structural member can be realized, the building heat preservation and the structural member have the same body and the same service life, and the construction cost is reduced.
3. According to the invention, by doping quartz sand, quartz powder and river sand, the gradation of the foam concrete is optimized, and by doping admixtures with different fineness, the contact area between bubbles is reduced, the bubble aggregation and cracking are inhibited, the number of large bubbles is reduced to a certain extent, and the strength, heat preservation and crack resistance of the foam concrete can be effectively improved.
4. The invention takes common Portland cement as a cementing material, mixes a large amount of industrial waste residue fly ash, adopts natural curing to prepare the foam concrete, fully utilizes the industrial waste residue on the premise of ensuring the strength, and has the characteristics of low production cost, utilization of the industrial waste residue, environmental friendliness and the like.
[ detailed description ] embodiments
Example 1
The solid waste fly ash high-strength foam concrete comprises the following components in parts by weight:
490 portions of ordinary Portland cement;
210 parts of fly ash;
490 parts of quartz powder;
157.5 parts of quartz sand;
52.5 parts of river sand;
7 parts of a JSM-1 type polycarboxylate superplasticizer;
1.75 parts of polypropylene fiber;
11.5 parts of hydrogen peroxide;
0.35 part of hydroxypropyl methyl cellulose;
0.23 part of manganese dioxide;
315 portions of water.
The preparation method of the solid waste fly ash high-strength foam concrete comprises the following steps:
(1) weighing ordinary portland cement, fly ash, an admixture and polypropylene fiber according to the mixing proportion, pouring the weighed components into a stirring instrument, and stirring for 3-5 min to obtain a uniformly mixed dry material;
(2) mixing a polycarboxylic acid high-efficiency water reducing agent with water, adding the mixture into a stirring instrument, and stirring the mixture for 10min at a speed of 100-200 r/min to obtain slurry;
(3) adding hydrogen peroxide, hydroxypropyl methyl cellulose and manganese dioxide in sequence, and stirring at the speed of 300-400 r/min for 1min to obtain foam concrete slurry;
(4) and pouring and forming the foam concrete slurry, standing for 24 hours, demoulding, and naturally curing for 28 days.
Example 2
The solid waste fly ash high-strength foam concrete comprises the following components in parts by weight:
210 parts of fly ash;
588 parts of quartz powder;
252 parts of quartz sand;
0 part of river sand;
315 portions of water.
The other non-listed components remain in accordance with example 1.
The preparation method of the solid waste fly ash high-strength foam concrete is the same as that of the embodiment 1.
Example 3
The solid waste fly ash high-strength foam concrete comprises the following components in parts by weight:
210 parts of fly ash;
588 parts of quartz powder;
189 parts of quartz sand;
63 parts of river sand;
315 portions of water.
The other non-listed components remain in accordance with example 1.
The preparation method of the solid waste fly ash high-strength foam concrete is the same as that of the embodiment 1.
Example 4
The solid waste fly ash high-strength foam concrete comprises the following components in parts by weight:
210 parts of fly ash;
588 parts of quartz powder;
126 parts of quartz sand;
126 parts of river sand;
315 portions of water.
The other non-listed components remain in accordance with example 1.
The preparation method of the solid waste fly ash high-strength foam concrete is the same as that of the embodiment 1.
Example 5
The solid waste fly ash high-strength foam concrete comprises the following components in parts by weight:
210 parts of fly ash;
588 parts of quartz powder;
63 parts of quartz sand;
189 parts of river sand;
315 portions of water.
The other non-listed components remain in accordance with example 1.
The preparation method of the solid waste fly ash high-strength foam concrete is the same as that of the embodiment 1.
Example 6
The solid waste fly ash high-strength foam concrete comprises the following components in parts by weight:
210 parts of fly ash;
392 parts of quartz powder;
168 parts of quartz sand;
0 part of river sand;
280 parts of water.
The other non-listed components remain in accordance with example 1.
The preparation method of the solid waste fly ash high-strength foam concrete is the same as that of the embodiment 1.
Example 7
The solid waste fly ash high-strength foam concrete comprises the following components in parts by weight:
210 parts of fly ash;
490 parts of quartz powder;
52.5 parts of quartz sand;
157.5 parts of river sand;
280 parts of water.
The other non-listed components remain in accordance with example 1.
The preparation method of the solid waste fly ash high-strength foam concrete is the same as that of the embodiment 1.
Example 8
The solid waste fly ash high-strength foam concrete comprises the following components in parts by weight:
210 parts of fly ash;
588 parts of quartz powder;
252 parts of quartz sand;
0 part of river sand;
280 parts of water.
The other non-listed components remain in accordance with example 1.
The preparation method of the solid waste fly ash high-strength foam concrete is the same as that of the embodiment 1.
Example 9
The solid waste fly ash high-strength foam concrete comprises the following components in parts by weight:
210 parts of fly ash;
588 parts of quartz powder;
189 parts of quartz sand;
63 parts of river sand;
280 parts of water.
The other non-listed components remain in accordance with example 1.
The preparation method of the solid waste fly ash high-strength foam concrete is the same as that of example 1
Example 10
The solid waste fly ash high-strength foam concrete comprises the following components in parts by weight:
210 parts of fly ash;
588 parts of quartz powder;
126 parts of quartz sand;
126 parts of river sand;
280 parts of water.
The other non-listed components remain in accordance with example 1.
The preparation method of the solid waste fly ash high-strength foam concrete is the same as that of example 1
Example 11
The solid waste fly ash high-strength foam concrete comprises the following components in parts by weight:
210 parts of fly ash;
588 parts of quartz powder;
63 parts of quartz sand;
189 parts of river sand;
280 parts of water.
The other non-listed components remain in accordance with example 1.
The preparation method of the solid waste fly ash high-strength foam concrete is the same as that of example 1
The performance of the foam concrete is tested according to the requirements of the foam concrete industry standard (JG/T266-.
The performance of the foam concrete prepared in the above examples 1 to 11 was tested:
(1) compressive strength;
(2) dry density;
(3) thermal conductivity coefficient.
Specific test results are shown in table 1.
Figure BDA0002787235120000051
The described embodiments are intended to be more fully illustrative of the invention than is considered to be limiting, and all such modifications are intended to be included within the scope of the invention as defined by the appended claims without departing from the spirit and scope of the invention.

Claims (9)

1. The solid waste fly ash high-strength foam concrete is characterized by being prepared from the following components in parts by weight: 450-500 parts of ordinary portland cement (42.5), 200-250 parts of fly ash, 550-850 parts of admixture, 280-320 parts of water, 1.5-2 parts of polypropylene fiber, 5-8 parts of polycarboxylic acid high-efficiency water reducing agent, 10-15 parts of foaming agent, 0.3-0.5 part of foam stabilizer and 0-0.3 part of catalyst.
2. A method as claimed in claim 1The solid waste fly ash high-strength foam concrete is characterized in that the foaming agent is industrial hydrogen peroxide and H2O2The content is 30 percent.
3. The solid waste fly ash high-strength foam concrete as claimed in claim 1, wherein the foam stabilizer is hydroxypropyl methyl cellulose with a viscosity of 20 ten thousand.
4. The solid waste fly ash high-strength foam concrete as claimed in claim 1, wherein the catalyst is manganese dioxide.
5. The solid waste fly ash high-strength foam concrete as claimed in claim 1, wherein the admixture comprises the following components in parts by weight: 50-255 parts of quartz sand, 390-590 parts of quartz powder and 0-190 parts of river sand.
6. The solid waste fly ash high-strength foam concrete as claimed in claim 5, wherein the fineness of the quartz sand is 40-70 meshes.
7. The solid waste fly ash high-strength foam concrete as claimed in claim 5, wherein the fineness of the quartz powder is 200 meshes.
8. The solid waste fly ash high-strength foam concrete as claimed in claim 5, wherein the fineness modulus of the river sand is 3.0-2.3.
9. The solid waste fly ash high-strength foam concrete according to any one of claims 1 to 8, characterized in that the preparation method comprises the following steps:
(1) weighing ordinary portland cement, fly ash, an admixture and polypropylene fiber according to the mixing proportion, pouring the ordinary portland cement, the fly ash, the admixture and the polypropylene fiber into a stirring instrument, and stirring for 3-5 min to obtain a uniformly mixed dry material;
(2) mixing a polycarboxylic acid high-efficiency water reducing agent with water, adding the mixture into a stirring instrument, and stirring the mixture for 10min at a speed of 100-200 r/min to obtain slurry;
(3) adding hydrogen peroxide, hydroxypropyl methyl cellulose and manganese dioxide in sequence, and stirring at the speed of 300-400 r/min for 1min to obtain foam concrete slurry;
(4) and pouring and forming the foam concrete slurry, standing for 24 hours, demoulding, and naturally curing for 28 days.
CN202011302454.6A 2020-11-19 2020-11-19 Solid waste fly ash high-strength foam concrete and preparation method thereof Withdrawn CN112321237A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Publications (1)

Publication Number Publication Date
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112983468A (en) * 2021-04-20 2021-06-18 重庆交通大学 Self-heat-preservation anti-freezing lining structure of traffic tunnel in seasonal frozen soil area
CN113816655A (en) * 2021-08-13 2021-12-21 闽南理工学院 Fiber-reinforced foam concrete material and preparation process thereof
CN116120028A (en) * 2023-01-04 2023-05-16 内蒙古工业大学 Autoclaved fly ash foam concrete formula and preparation method thereof
CN117809768A (en) * 2024-02-28 2024-04-02 内蒙古工业大学 Method for evaluating compressive strength of fly ash foam concrete based on density

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112983468A (en) * 2021-04-20 2021-06-18 重庆交通大学 Self-heat-preservation anti-freezing lining structure of traffic tunnel in seasonal frozen soil area
CN113816655A (en) * 2021-08-13 2021-12-21 闽南理工学院 Fiber-reinforced foam concrete material and preparation process thereof
CN116120028A (en) * 2023-01-04 2023-05-16 内蒙古工业大学 Autoclaved fly ash foam concrete formula and preparation method thereof
CN117809768A (en) * 2024-02-28 2024-04-02 内蒙古工业大学 Method for evaluating compressive strength of fly ash foam concrete based on density
CN117809768B (en) * 2024-02-28 2024-05-24 内蒙古工业大学 Method for evaluating compressive strength of fly ash foam concrete based on density

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