CN110540397B - Anti-cracking energy-saving heat-insulating aerated concrete block and preparation method thereof - Google Patents
Anti-cracking energy-saving heat-insulating aerated concrete block and preparation method thereof Download PDFInfo
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- CN110540397B CN110540397B CN201910800831.XA CN201910800831A CN110540397B CN 110540397 B CN110540397 B CN 110540397B CN 201910800831 A CN201910800831 A CN 201910800831A CN 110540397 B CN110540397 B CN 110540397B
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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
- C04B28/02—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
- C04B28/10—Lime cements or magnesium oxide cements
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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
- C04B2111/76—Use at unusual temperatures, e.g. sub-zero
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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
- 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
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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
- 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
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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
- 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
Abstract
The invention discloses an anti-cracking energy-saving heat-insulating aerated concrete block which comprises the following raw materials in parts by weight: 16-25 parts of flotation steel slag tail mud, 22-34 parts of calcined municipal sludge, 30-38 parts of fly ash, 7-11 parts of cement, 14-21 parts of lime, 1-3 parts of gypsum, 5-8 parts of lignin fiber, 1.2-1.6 parts of air entraining agent, 0.1-0.4 part of foam stabilizer and 0.06-0.1 part of aluminum paste, and then mixing and stirring, slurry injection molding, standing and maintaining, demolding and cutting, and autoclaving and maintaining. The flotation steel slag tail mud and the calcined municipal sludge are used as partial siliceous raw materials and calcareous raw materials, so that the green energy-saving aerated concrete building wall material is prepared by recycling solid wastes, and the purposes of saving energy, reducing emission and protecting the environment are achieved.
Description
Technical Field
The invention relates to an industrial solid waste building wall material and a preparation method thereof, in particular to an anti-cracking energy-saving heat-insulating aerated concrete block and a preparation method thereof.
Background
The flotation steel slag tail mud is solid waste generated by separating metal and nonmetal from steel slag after the steel slag is treated by a flotation process and separating magnetic substances by magnetic force and mechanical force. If a series of measures are not taken to reasonably utilize the flotation steel slag tail mud, huge environmental pollution is caused, a large amount of land is occupied, and the economic and ecological development is greatly influenced. However, as the flotation steel slag tail mud is soaked in water for a long time, the active components in the flotation steel slag tail mud are partially hydrated, so that the chemical activity and the hydraulic activity in the steel slag are greatly reduced. The application of the flotation steel slag tail mud is greatly limited, and the value of the flotation steel slag tail mud is not fully utilized. Therefore, no relevant research report on the resource utilization of the flotation steel slag tailings is found in China.
Municipal sludge is a precipitate (organic matter which is difficult to decompose, heavy metal, a small amount of pathogenic microorganisms and the like) with extremely complex composition generated in a sewage treatment plant during sewage treatment. The urban sludge yield in China is very high, and if the sludge is directly exposed in the environment without proper treatment, serious secondary pollution is brought, and the health of human beings is threatened. Therefore, the sludge is subjected to reduction, stabilization and harmless treatment. Experimental research proves that the calcined municipal sludge has potential resource utilization value, such as preparation of building materials and the like.
Since the 1920 s, the aerated concrete has become a self-insulation material with the greatest market prospect due to the characteristics of good heat insulation, sound insulation and fire resistance, high utilization efficiency of resources and energy, excellent structural performance and the like. Therefore, the flotation steel slag tail mud and the urban calcined sludge are adopted to prepare the aerated concrete, so that the aerated concrete has a considerable effect on the development of social, economic and ecological aspects. At present, the research on the aerated concrete in China gradually becomes mature. Patent CN107324844A discloses a method for preparing aerated concrete blocks by using steel slag magnetic separation tail mud, wherein the aerated concrete blocks are prepared by using flotation steel slag tail mud to replace partial lime and cement, and the mixing amount of the tail mud can reach 20%, so that the problem of tail mud utilization is solved to a certain extent, but the cracking phenomenon of the blocks is easy to occur. The patent CN106365674B discloses a method for preparing an aerated concrete block by using steel slag tail mud and desulfurized ash, the method simultaneously uses two types of waste slag, the raw material cost is greatly reduced, and the prepared aerated concrete block has low density and good strength performance, but the application range is not wide enough.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide an anti-cracking energy-saving heat-insulating aerated concrete block, which takes waste steel slag as part of siliceous raw materials and calcareous raw materials, realizes the reutilization of solid wastes and resources to prepare green energy-saving aerated concrete building wall materials, and achieves the purposes of energy conservation, emission reduction and environmental protection; the invention also aims to provide a preparation method of the anti-cracking energy-saving heat-insulating aerated concrete block.
The technical scheme is as follows: the anti-cracking energy-saving heat-insulating aerated concrete block comprises the following raw materials in parts by weight: 16-25 parts of flotation steel slag tail mud, 22-34 parts of calcined municipal sludge, 30-38 parts of fly ash, 7-11 parts of cement, 14-21 parts of lime, 1-3 parts of gypsum, 5-8 parts of lignin fiber, 1.2-1.6 parts of air entraining agent, 0.1-0.4 part of foam stabilizer and 0.06-0.1 part of aluminum paste.
In order to further optimize the performance of the prepared concrete building block, the flotation steel slag tail mud is obtained by treating steel slag through a flotation process, and the screen residue of the steel slag tail mud passing through a 80-micron square-hole sieve is less than or equal to 15 percent.
Preferably, the particle size of the calcined municipal sludge is 150-200 meshes.
Preferably, the fly ash is second-grade fly ash, and the screen residue of the fly ash passing through a 80-micron square-hole sieve is 16-22%.
Preferably, the cement is Portland cement No. 42.5 or Portland cement.
Preferably, the lime is industrial-grade quicklime, and the screen residue of the industrial-grade quicklime passing through a 80-micrometer square-hole screen is 8-15%.
Preferably, the gypsum is desulfurized gypsum, CaSO thereof4·2H2The content of O is more than or equal to 92 percent.
Preferably, the lignin fiber is flocculent and has a length less than or equal to 6 mm.
Further, the air entraining agent is saponin or sodium fatty alcohol sulfate; the foam stabilizer is silicone polyether emulsion.
Further, the aluminum powder paste is industrial aluminum powder paste, and the content of active aluminum is more than or equal to 90%.
The invention also provides a preparation method of the anti-cracking energy-saving heat-insulating aerated concrete block, which comprises the following steps:
(1) mixing and stirring: mixing and stirring the treated flotation steel slag tail mud and calcined municipal sludge with fly ash, cement, lime, gypsum and lignin fiber for 30-45 s, adding water into an air entraining agent, a foam stabilizer and aluminum powder paste, stirring for 5-10s, and finally mixing the mixed solution with powder for less than or equal to 30 s;
(2) slurry injection molding: injecting the uniformly stirred slurry into the test piece sprayed with the release agent;
(3) standing and maintaining: conveying the test piece into a curing workshop for standing and foaming, wherein the curing temperature is 50-60 ℃, and standing and curing are carried out for 4-6 hours;
(4) demolding and cutting: cutting according to requirements by adopting a transverse cutting machine and a longitudinal cutting machine, and removing non-conforming components such as damaged pieces;
(5) steam pressure curing: and conveying the cut aerated green bricks into an autoclave by using a rail car, and discharging the aerated green bricks out of the autoclave after autoclave curing is carried out for 6-8 hours at the temperature of 160-180 ℃ and under the pressure of 1.15-1.35 MPa.
The invention principle is as follows: according to the invention, the flotation steel slag tail mud and the calcined municipal sludge are used as partial siliceous raw materials and calcareous raw materials, a fiber toughening method and proper raw material proportion and proper selection of an air entraining agent and a foam stabilizer are adopted, so that the green energy-saving aerated concrete building wall material is prepared by recycling solid wastes, the crack resistance of the aerated concrete building block can be effectively improved, and the application range is wide; the air entraining agent adopts saponin or sodium fatty alcohol sulfate, has excellent foaming effect and emulsifying effect, adopts the silicone polyether emulsion as the foam stabilizer, ensures that the aerated concrete block has a fine honeycomb-shaped hole structure before forming, and ensures good heat insulation performance; the lignin fiber toughened aerated concrete can enhance the anti-cracking capacity of the aerated concrete building blocks, reduce the phenomena of high breakage rate and easy breakage of the aerated concrete in the transportation process, and further improve the quality of finished aerated concrete products.
The lignin fiber exists in the slurry in a three-dimensional dispersion state, and can form a space network structure. The superfine structure can have stronger caking property, and further, the fiber in the slurry forms a firm skeleton structure in a criss-cross state, and has certain stability. In addition, the addition of the lignin fiber can play a role in tackifying, so that the thickening rate of the slurry is improved to a certain extent, and the gas generating rate of the slurry and the aluminum powder is ensured to reach the dynamic balance effect. The fiber has high elastic modulus and high tensile strength, and can increase the strength and the deformation resistance of slurry after being doped, thereby improving the properties of the aerated concrete finished product.
Has the advantages that:
(1) according to the anti-cracking energy-saving heat-preservation aerated concrete block, the flotation steel slag tail mud and the calcined municipal sludge are used as partial siliceous raw materials and calcareous raw materials, so that the green energy-saving aerated concrete building wall material is prepared by recycling solid wastes, and the purposes of energy conservation, emission reduction and environmental protection are achieved;
(2) in the preparation method of the anti-cracking energy-saving heat-insulating aerated concrete block, saponin or fatty alcohol sodium sulfate is adopted as an air entraining agent, so that the aerated concrete block has excellent foaming effect and emulsification effect, and the silicone polyether emulsion is adopted as a foam stabilizer, so that the aerated concrete block is ensured to have a fine honeycomb-shaped hole structure before being formed, and the good heat-insulating property of the aerated concrete block is ensured;
(3) according to the invention, the lignin fiber toughened aerated concrete is adopted, so that the anti-cracking capacity of the aerated concrete block can be enhanced, the phenomena of high breakage rate and easy breakage of the aerated concrete in the transportation process are reduced, and the quality of the finished aerated concrete product is further improved;
(4) the aerated concrete block has the advantages of small volume weight, small heat conductivity coefficient, excellent toughness and the like, can be suitable for cold regions, and has wide application range;
(5) the actual detection shows that the aerated concrete block prepared by the invention meets the index requirements of GB/T11968-2006 autoclaved aerated concrete block.
Drawings
FIG. 1 is a flow chart of the aerated concrete block preparation process of the present invention;
fig. 2 is a photograph of the pore structure of an aerated concrete block.
Detailed Description
The present invention will be described in detail with reference to examples.
Example 1:
the raw materials for preparing the anti-cracking energy-saving heat-insulating aerated concrete block comprise the following components in parts by weight: 16 parts of flotation steel slag tail mud, 27 parts of calcined municipal sludge, 30 parts of fly ash, 8 parts of cement, 16 parts of lime, 3 parts of gypsum, 5 parts of lignin fiber, 1.2 parts of air entraining agent, 0.2 part of foam stabilizer and 0.08 part of aluminum paste.
Wherein, the flotation steel slag tail mud is obtained by the treatment of the flotation process on the steel slag, and the screen residue of the steel slag after passing through a square hole sieve with the size of 80 mu m is less than or equal to 15 percent; the granularity of the calcined municipal sludge is 150-200 meshes; the fly ash is second-grade fly ash, and the screen residue of the fly ash passing through a 80-micron square-hole sieve is 16-22 percent; the cement is No. 42.5 ordinary portland cement; the lime is industrial-grade quicklime, and the screen residue of the lime passing through a 80-micron square-hole sieve is 8-15 percent; the gypsum is desulfurized gypsum, which is CaSO4·2H2The O content is more than or equal to 92 percent; the lignin fiber is flocculent and has a length less than or equal to 6 mm; the air entraining agent is saponin; the foam stabilizer is silicone polyether emulsion.
As shown in fig. 1, the aerated concrete block process flow diagram of the invention is shown, and the preparation method of the anti-cracking energy-saving heat-insulating aerated concrete block of the embodiment comprises the following steps:
(1) mixing and stirring: mixing and stirring the treated flotation steel slag tail mud, urban calcined sludge, fly ash, cement, lime, gypsum and lignin fiber according to the proportion for 30-45 s, adding water into the air entraining agent, the foam stabilizer and the aluminum powder paste, stirring for 5-10s, and finally mixing the mixed solution and the powder for less than or equal to 30 s.
(2) Slurry injection molding: and (4) injecting the uniformly stirred slurry into the test piece sprayed with the release agent.
(3) Standing and maintaining: and (3) conveying the test piece into a curing workshop for standing and foaming, wherein the curing temperature is 55 ℃, and standing and curing are carried out for 5 hours.
(4) Demolding and cutting: and cutting by adopting a transverse cutting machine and a longitudinal cutting machine according to requirements to remove the damaged pieces and other non-conforming pieces.
(5) Steam pressure curing: and (3) conveying the cut aerated green bricks into an autoclave by using a rail car, and discharging the aerated green bricks out of the autoclave after 6 hours of autoclave curing at the temperature of 165 ℃ and under the pressure of 1.15 MPa.
The prepared aerated concrete block has a fine honeycomb-shaped hole structure as shown in figure 2, so that good heat insulation performance of the aerated concrete block is guaranteed.
Example 2:
the raw materials for preparing the anti-cracking energy-saving heat-insulating aerated concrete block comprise the following components in parts by weight: 17 parts of flotation steel slag tail mud, 26 parts of calcined municipal sludge, 30 parts of fly ash, 8 parts of cement, 16 parts of lime, 3 parts of gypsum, 5 parts of lignin fiber, 1.2 parts of air entraining agent, 0.2 part of foam stabilizer and 0.08 part of aluminum paste.
Wherein, the flotation steel slag tail mud is obtained by the treatment of the flotation process on the steel slag, and the screen residue of the steel slag after passing through a square hole sieve with the size of 80 mu m is less than or equal to 15 percent; the granularity of the calcined municipal sludge is 150-200 meshes; the fly ash is second-grade fly ash, and the screen residue of the fly ash passing through a 80-micron square-hole sieve is 16-22 percent; the cement is No. 42.5 ordinary portland cement; the lime is industrial-grade quicklime, and the screen residue of the lime passing through a 80-micron square-hole sieve is 8-15 percent; the gypsum is desulfurized gypsum, which is CaSO4·2H2The O content is more than or equal to 92 percent; the lignin fiber is flocculent and has a length less than or equal to 6 mm; the air entraining agent is fatty alcoholSodium sulfate; the foam stabilizer is silicone polyether emulsion.
The anti-cracking energy-saving heat-preservation aerated concrete block is prepared by mixing and stirring, slurry injection molding, standing and maintaining, demolding and cutting and autoclaved maintaining, and the specific preparation method comprises the following steps:
(1) mixing and stirring: mixing and stirring the treated flotation steel slag tail mud, urban calcined sludge, fly ash, cement, lime, gypsum and lignin fiber according to the proportion for 30-45 s, adding water into the air entraining agent, the foam stabilizer and the aluminum powder paste, stirring for 5-10s, and finally mixing the mixed solution and the powder for less than or equal to 30 s.
(2) Slurry injection molding: and (4) injecting the uniformly stirred slurry into the test piece sprayed with the release agent.
(3) Standing and maintaining: and (3) conveying the test piece into a curing workshop for standing and foaming, wherein the curing temperature is 55 ℃, and standing and curing are carried out for 5 hours.
(4) Demolding and cutting: and cutting by adopting a transverse cutting machine and a longitudinal cutting machine according to requirements to remove the damaged pieces and other non-conforming pieces.
(5) Steam pressure curing: and (3) conveying the cut aerated green bricks into an autoclave by using a rail car, and discharging the aerated green bricks out of the autoclave after 6 hours of autoclave curing at the temperature of 165 ℃ and under the pressure of 1.15 MPa.
The aerated concrete block prepared by the embodiment has a fine honeycomb-shaped hole structure, so that the good heat insulation performance of the aerated concrete block is ensured.
Example 3:
the raw materials for preparing the anti-cracking energy-saving heat-insulating aerated concrete block comprise the following components in parts by weight: 18 parts of flotation steel slag tail mud, 25 parts of calcined municipal sludge, 30 parts of fly ash, 8 parts of cement, 16 parts of lime, 3 parts of gypsum, 5 parts of lignin fiber, 1.2 parts of air entraining agent, 0.2 part of foam stabilizer and 0.08 part of aluminum paste.
Wherein, the flotation steel slag tail mud is obtained by the treatment of the flotation process on the steel slag, and the screen residue of the steel slag after passing through a square hole sieve with the size of 80 mu m is less than or equal to 15 percent; the granularity of the calcined municipal sludge is 150-200 meshes; the fly ash is second-grade fly ash, and the screen residue of the fly ash passing through a 80-micron square-hole sieve is 16-22 percent; the cement is No. 42.5 common silicic acidSalt cement; the lime is industrial-grade quicklime, and the screen residue of the lime passing through a 80-micron square-hole sieve is 8-15 percent; the gypsum is desulfurized gypsum, which is CaSO4·2H2The O content is more than or equal to 92 percent; the lignin fiber is flocculent and has a length less than or equal to 6 mm; the air entraining agent is fatty alcohol sodium sulfate; the foam stabilizer is silicone polyether emulsion.
The anti-cracking energy-saving heat-preservation aerated concrete block is prepared by mixing and stirring, slurry injection molding, standing and maintaining, demolding and cutting and autoclaved maintaining, and the specific preparation method comprises the following steps:
(1) mixing and stirring: mixing and stirring the treated flotation steel slag tail mud, urban calcined sludge, fly ash, cement, lime, gypsum and lignin fiber according to the proportion for 30-45 s, adding water into the air entraining agent, the foam stabilizer and the aluminum powder paste, stirring for 5-10s, and finally mixing the mixed solution and the powder for less than or equal to 30 s.
(2) Slurry injection molding: and (4) injecting the uniformly stirred slurry into the test piece sprayed with the release agent.
(3) Standing and maintaining: and conveying the test piece into a curing workshop for standing and foaming, wherein the curing temperature is 50 ℃, and standing and curing are carried out for 4 hours.
(4) Demolding and cutting: and cutting by adopting a transverse cutting machine and a longitudinal cutting machine according to requirements to remove the damaged pieces and other non-conforming pieces.
(5) Steam pressure curing: and (3) conveying the cut aerated green bricks into an autoclave by using a rail car, and discharging the aerated green bricks out of the autoclave after 6 hours of autoclave curing at the temperature of 160 ℃ and under the pressure of 1.25 MPa.
The aerated concrete block prepared by the embodiment has a fine honeycomb-shaped hole structure, so that the good heat insulation performance of the aerated concrete block is ensured.
Example 4:
the raw materials for preparing the anti-cracking energy-saving heat-insulating aerated concrete block comprise the following components in parts by weight: 17 parts of flotation steel slag tail mud, 26 parts of calcined municipal sludge, 30 parts of fly ash, 10 parts of cement, 14 parts of lime, 3 parts of gypsum, 5 parts of lignin fiber, 1.4 parts of air entraining agent, 0.3 part of foam stabilizer and 0.06 part of aluminum paste.
Wherein, floating the steel slag tailThe mud is obtained by the flotation process treatment of the steel slag, and the residue of the mud sieved by a 80 mu m square hole sieve is less than or equal to 15 percent; the granularity of the calcined municipal sludge is 150-200 meshes; the fly ash is second-grade fly ash, and the screen residue of the fly ash passing through a 80-micron square-hole sieve is 16-22 percent; the cement is No. 42.5 ordinary portland cement; the lime is industrial-grade quicklime, and the screen residue of the lime passing through a 80-micron square-hole sieve is 8-15 percent; the gypsum is desulfurized gypsum, which is CaSO4·2H2The O content is more than or equal to 92 percent; the lignin fiber is flocculent and has a length less than or equal to 6 mm; the air entraining agent is fatty alcohol sodium sulfate; the foam stabilizer is silicone polyether emulsion.
The anti-cracking energy-saving heat-preservation aerated concrete block is prepared by mixing and stirring, slurry injection molding, standing and maintaining, demolding and cutting and autoclaved maintaining, and the specific preparation method comprises the following steps:
(1) mixing and stirring: mixing and stirring the treated flotation steel slag tail mud, urban calcined sludge, fly ash, cement, lime, gypsum and lignin fiber according to the proportion for 30-45 s, adding water into the air entraining agent, the foam stabilizer and the aluminum powder paste, stirring for 5-10s, and finally mixing the mixed solution and the powder for less than or equal to 30 s.
(2) Slurry injection molding: and (4) injecting the uniformly stirred slurry into the test piece sprayed with the release agent.
(3) Standing and maintaining: and (3) conveying the test piece into a curing workshop for standing and foaming, wherein the curing temperature is 60 ℃, and standing and curing are carried out for 6 hours.
(4) Demolding and cutting: and cutting by adopting a transverse cutting machine and a longitudinal cutting machine according to requirements to remove the damaged pieces and other non-conforming pieces.
(5) Steam pressure curing: and (3) conveying the cut aerated green bricks into an autoclave by using a rail car, and discharging the aerated green bricks out of the autoclave after 7.5 hours of autoclave curing at 180 ℃ under the pressure of 1.35 MPa.
The aerated concrete block prepared by the embodiment has a fine honeycomb-shaped hole structure, so that the good heat insulation performance of the aerated concrete block is ensured.
Example 5:
the raw materials for preparing the anti-cracking energy-saving heat-insulating aerated concrete block comprise the following components in parts by weight: 18 parts of flotation steel slag tail mud, 25 parts of calcined municipal sludge, 30 parts of fly ash, 10 parts of cement, 14 parts of lime, 3 parts of gypsum, 5 parts of lignin fiber, 1.4 parts of air entraining agent, 0.3 part of foam stabilizer and 0.06 part of aluminum paste.
Wherein, the flotation steel slag tail mud is obtained by the treatment of the flotation process on the steel slag, and the screen residue of the steel slag after passing through a square hole sieve with the size of 80 mu m is less than or equal to 15 percent; the granularity of the calcined municipal sludge is 150-200 meshes; the fly ash is second-grade fly ash, and the screen residue of the fly ash passing through a 80-micron square-hole sieve is 16-22 percent; the cement is silicate cement; the lime is industrial-grade quicklime, and the screen residue of the lime passing through a 80-micron square-hole sieve is 8-15 percent; the gypsum is desulfurized gypsum, which is CaSO4·2H2The O content is more than or equal to 92 percent; the lignin fiber is flocculent and has a length less than or equal to 6 mm; the air entraining agent is fatty alcohol sodium sulfate; the foam stabilizer is silicone polyether emulsion.
The anti-cracking energy-saving heat-preservation aerated concrete block is prepared by mixing and stirring, slurry injection molding, standing and maintaining, demolding and cutting and autoclaved maintaining, and the specific preparation method comprises the following steps:
(1) mixing and stirring: mixing and stirring the treated flotation steel slag tail mud, urban calcined sludge, fly ash, cement, lime, gypsum and lignin fiber according to the proportion for 30-45 s, adding water into the air entraining agent, the foam stabilizer and the aluminum powder paste, stirring for 5-10s, and finally mixing the mixed solution and the powder for less than or equal to 30 s.
(2) Slurry injection molding: and (4) injecting the uniformly stirred slurry into the test piece sprayed with the release agent.
(3) Standing and maintaining: and (3) conveying the test piece into a curing workshop for standing and foaming, wherein the curing temperature is 55 ℃, and standing and curing are carried out for 5 hours.
(4) Demolding and cutting: and cutting by adopting a transverse cutting machine and a longitudinal cutting machine according to requirements to remove the damaged pieces and other non-conforming pieces.
(5) Steam pressure curing: and (3) conveying the cut aerated green bricks into an autoclave by using a rail car, and discharging the aerated green bricks out of the autoclave after autoclaving and curing for 8 hours at the temperature of 170 ℃ and under the pressure of 1.25 MPa.
The aerated concrete block prepared by the embodiment has a fine honeycomb-shaped hole structure, so that the good heat insulation performance of the aerated concrete block is ensured.
The crack-resistant energy-saving heat-insulating aerated concrete blocks prepared in the embodiments 1 to 5 are tested for dry density, strength and heat conductivity coefficient, and the test results are summarized as shown in table 1. Setting comparative examples 1-5, wherein the comparative examples are concrete blocks without adding the lignin fibers, the comparative example 1 is a concrete block prepared under the condition that the lignin fibers are not added, and other proportions and preparation processes are the same as those of the concrete block prepared in the example 1, and the comparative examples 2-5 are similar; as can be seen, the prepared aerated concrete blocks all reach the A3.5B06 grade of GB/T11968-2006 autoclaved aerated concrete block. Under the same condition, compared with the concrete block without the lignin fiber, the concrete block prepared by adding the lignin fiber improves the crack resistance of the block due to the tackifying and toughening effects of the lignin fiber, ensures the excellent mechanical property of the block, and greatly reduces the fracture phenomenon of the block caused by factors such as jolt and the like in the transportation process. Meanwhile, the defective rate of the finished building block products is reduced to a certain extent, the cost investment of enterprises is reduced, and the economic benefit of the enterprises is improved.
TABLE 1 test results of aerated concrete blocks of examples 1 to 5 and comparative examples 1 to 5
Example 6:
the raw materials for preparing the anti-cracking energy-saving heat-insulating aerated concrete block comprise the following components in parts by weight: 20 parts of flotation steel slag tail mud, 22 parts of calcined municipal sludge, 32 parts of fly ash, 7 parts of cement, 20 parts of lime, 2 parts of gypsum, 6 parts of lignin fiber, 1.5 parts of air entraining agent, 0.1 part of foam stabilizer and 0.07 part of aluminum paste.
Wherein, the flotation steel slag tail mud is obtained by the treatment of the flotation process on the steel slag, and the screen residue of the steel slag after passing through a square hole sieve with the size of 80 mu m is less than or equal to 15 percent; the granularity of the calcined municipal sludge is 150-200 meshes; the fly ash is second-grade fly ash, and the screen residue of the fly ash passing through a 80-micron square-hole sieve is 16-22 percent; the cement is No. 42.5 ordinary portland cement; the lime is industrial-grade quicklime, and the screen residue of the lime passing through a 80-micron square-hole sieve is 8 to 15 percent(ii) a The gypsum is desulfurized gypsum, which is CaSO4·2H2The O content is more than or equal to 92 percent; the lignin fiber is flocculent and has a length less than or equal to 6 mm; the air entraining agent is saponin; the foam stabilizer is silicone polyether emulsion.
The preparation method of the anti-cracking energy-saving heat-insulating aerated concrete block is the same as that in the embodiment 1, and the performance of the prepared aerated concrete block is consistent with that in the embodiment 1.
Example 7:
the raw materials for preparing the anti-cracking energy-saving heat-insulating aerated concrete block comprise the following components in parts by weight: 25 parts of flotation steel slag tail mud, 30 parts of calcined municipal sludge, 34 parts of fly ash, 9 parts of cement, 18 parts of lime, 1 part of gypsum, 7 parts of lignin fiber, 1.6 parts of air entraining agent, 0.4 part of foam stabilizer and 0.08 part of aluminum paste.
Wherein, the flotation steel slag tail mud is obtained by the treatment of the flotation process on the steel slag, and the screen residue of the steel slag after passing through a square hole sieve with the size of 80 mu m is less than or equal to 15 percent; the granularity of the calcined municipal sludge is 150-200 meshes; the fly ash is second-grade fly ash, and the screen residue of the fly ash passing through a 80-micron square-hole sieve is 16-22 percent; the cement is No. 42.5 ordinary portland cement; the lime is industrial-grade quicklime, and the screen residue of the lime passing through a 80-micron square-hole sieve is 8-15 percent; the gypsum is desulfurized gypsum, which is CaSO4·2H2The O content is more than or equal to 92 percent; the lignin fiber is flocculent and has a length less than or equal to 6 mm; the air entraining agent is saponin; the foam stabilizer is silicone polyether emulsion.
The preparation method of the anti-cracking energy-saving heat-insulating aerated concrete block is the same as that in the embodiment 1, and the performance of the prepared aerated concrete block is consistent with that in the embodiment 1.
Example 8:
the raw materials for preparing the anti-cracking energy-saving heat-insulating aerated concrete block comprise the following components in parts by weight: 20 parts of flotation steel slag tail mud, 34 parts of calcined municipal sludge, 38 parts of fly ash, 11 parts of cement, 21 parts of lime, 3 parts of gypsum, 8 parts of lignin fiber, 1.5 parts of air entraining agent, 0.15 part of foam stabilizer and 0.1 part of aluminum paste.
Wherein, the flotation steel slag tail mud is obtained by the treatment of the flotation process on the steel slag, and the screen residue of the steel slag after passing through a square hole sieve with the size of 80 mu m is less than or equal to 15 percent; the granularity of calcined municipal sludge is 150-200 meshes(ii) a The fly ash is second-grade fly ash, and the screen residue of the fly ash passing through a 80-micron square-hole sieve is 16-22 percent; the cement is No. 42.5 ordinary portland cement; the lime is industrial-grade quicklime, and the screen residue of the lime passing through a 80-micron square-hole sieve is 8-15 percent; the gypsum is desulfurized gypsum, which is CaSO4·2H2The O content is more than or equal to 92 percent; the lignin fiber is flocculent and has a length less than or equal to 6 mm; the air entraining agent is saponin; the foam stabilizer is silicone polyether emulsion.
The preparation method of the anti-cracking energy-saving heat-insulating aerated concrete block is the same as that in the embodiment 1, and the performance of the prepared aerated concrete block is consistent with that in the embodiment 1.
Claims (6)
1. The anti-cracking energy-saving heat-insulating aerated concrete block is characterized in that: the concrete block comprises the following raw materials in parts by weight: 16-25 parts of flotation steel slag tail mud, 22-34 parts of calcined municipal sludge, 30-38 parts of fly ash, 7-11 parts of cement, 14-21 parts of lime, 1-3 parts of gypsum, 5-8 parts of lignin fiber, 1.2-1.6 parts of air entraining agent, 0.1-0.4 part of foam stabilizer and 0.06-0.1 part of aluminum paste; the granularity of the calcined municipal sludge is 150-200 meshes; the lignin fiber is flocculent and has a length less than or equal to 6 mm; the air entraining agent is saponin or sodium fatty alcohol sulfate; the foam stabilizer is silicone polyether emulsion;
the preparation method of the anti-cracking energy-saving heat-insulating aerated concrete block comprises the following steps:
(1) mixing and stirring: mixing and stirring the treated flotation steel slag tail mud and calcined municipal sludge with fly ash, cement, lime, gypsum and lignin fiber for 30-45 s, adding water into an air entraining agent, a foam stabilizer and aluminum powder paste, stirring for 5-10s, and finally mixing the mixed solution with powder for less than or equal to 30 s;
(2) slurry injection molding: injecting the uniformly stirred slurry into the test piece sprayed with the release agent;
(3) standing and maintaining: conveying the test piece into a curing workshop for standing and foaming, wherein the curing temperature is 50-60 ℃, and standing and curing are carried out for 4-6 hours;
(4) demolding and cutting: cutting by a cutting machine according to requirements, and removing damaged pieces;
(5) steam pressure curing: and conveying the cut aerated green bricks into an autoclave by using a rail car, and discharging the aerated green bricks out of the autoclave after autoclave curing is carried out for 6-8 hours at the temperature of 160-180 ℃ and under the pressure of 1.15-1.35 MPa.
2. The anti-cracking energy-saving heat-insulating aerated concrete block according to claim 1, which is characterized in that: the flotation steel slag tail mud is obtained by treating steel slag through a flotation process, and the residue of the steel slag after passing through a 80-micron square-hole sieve is less than or equal to 15 percent.
3. The anti-cracking energy-saving heat-insulating aerated concrete block according to claim 1, which is characterized in that: the fly ash is secondary fly ash, and the residue of the fly ash after passing through a 80-micrometer square-hole sieve is 16-22%.
4. The anti-cracking energy-saving heat-insulating aerated concrete block according to claim 1, which is characterized in that: the lime is industrial-grade quicklime, and the screen residue of the industrial-grade quicklime passing through a 80-micrometer square-hole screen is 8-15%.
5. The anti-cracking energy-saving heat-insulating aerated concrete block according to claim 1, which is characterized in that: the gypsum is desulfurized gypsum, which is CaSO4·2H2The content of O is more than or equal to 92 percent.
6. The anti-cracking energy-saving heat-insulating aerated concrete block according to claim 1, which is characterized in that: the aluminum powder paste is industrial-grade aluminum powder paste, and the active aluminum content is more than or equal to 90 percent; the cement is No. 42.5 ordinary portland cement or portland cement.
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| CN111285655A (en) * | 2020-03-24 | 2020-06-16 | 安徽省高迪循环经济产业园股份有限公司 | Aerated concrete preparation method based on solid waste resource utilization |
| CN113105195A (en) * | 2021-02-24 | 2021-07-13 | 黄石市旺新环保科技有限公司 | Foam concrete block manufactured by utilizing solid waste and preparation method thereof |
| CN113004055B (en) * | 2021-05-06 | 2023-03-10 | 太原龙投富思特新材料科技有限公司 | Green high-thermal-resistance self-insulation building block and preparation method thereof |
| CN113716972A (en) * | 2021-08-11 | 2021-11-30 | 中宜(苏州)环境科技有限公司 | Method for producing autoclaved aerated building blocks by using sludge carbon |
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