CN115677379B - Preparation method of foam concrete - Google Patents
Preparation method of foam concrete Download PDFInfo
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- CN115677379B CN115677379B CN202211471941.4A CN202211471941A CN115677379B CN 115677379 B CN115677379 B CN 115677379B CN 202211471941 A CN202211471941 A CN 202211471941A CN 115677379 B CN115677379 B CN 115677379B
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- 239000011381 foam concrete Substances 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 239000002893 slag Substances 0.000 claims abstract description 111
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 77
- 241000209094 Oryza Species 0.000 claims abstract description 69
- 235000007164 Oryza sativa Nutrition 0.000 claims abstract description 69
- 235000009566 rice Nutrition 0.000 claims abstract description 69
- 239000002245 particle Substances 0.000 claims abstract description 38
- 239000004568 cement Substances 0.000 claims abstract description 35
- 239000000843 powder Substances 0.000 claims abstract description 33
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 22
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 21
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 21
- 239000004088 foaming agent Substances 0.000 claims abstract description 21
- 238000003756 stirring Methods 0.000 claims abstract description 21
- 238000007605 air drying Methods 0.000 claims abstract description 20
- 238000005187 foaming Methods 0.000 claims abstract description 19
- 239000006260 foam Substances 0.000 claims abstract description 16
- 238000002791 soaking Methods 0.000 claims abstract description 16
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 15
- 235000019738 Limestone Nutrition 0.000 claims abstract description 14
- 239000006028 limestone Substances 0.000 claims abstract description 14
- 238000012216 screening Methods 0.000 claims abstract description 14
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000002253 acid Substances 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 10
- 238000001238 wet grinding Methods 0.000 claims abstract description 8
- 238000012360 testing method Methods 0.000 claims abstract description 7
- 238000005303 weighing Methods 0.000 claims abstract description 7
- 229910052742 iron Inorganic materials 0.000 claims abstract description 6
- 230000002378 acidificating effect Effects 0.000 claims abstract description 3
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 11
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 claims description 8
- 239000002994 raw material Substances 0.000 claims description 5
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 claims description 4
- 235000019253 formic acid Nutrition 0.000 claims description 4
- 238000002156 mixing Methods 0.000 abstract description 2
- 239000002956 ash Substances 0.000 description 20
- 239000004567 concrete Substances 0.000 description 6
- 235000021120 animal protein Nutrition 0.000 description 5
- 239000000835 fiber Substances 0.000 description 5
- 238000000227 grinding Methods 0.000 description 5
- 238000006386 neutralization reaction Methods 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 3
- -1 aluminum salt Chemical class 0.000 description 3
- 239000000378 calcium silicate Substances 0.000 description 3
- 229910052918 calcium silicate Inorganic materials 0.000 description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000013329 compounding Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003628 erosive effect Effects 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 239000010881 fly ash Substances 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000010903 husk Substances 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 229920002972 Acrylic fiber Polymers 0.000 description 1
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- CBOCVOKPQGJKKJ-UHFFFAOYSA-L Calcium formate Chemical compound [Ca+2].[O-]C=O.[O-]C=O CBOCVOKPQGJKKJ-UHFFFAOYSA-L 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 239000004115 Sodium Silicate Substances 0.000 description 1
- 229920002978 Vinylon Polymers 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 229940044172 calcium formate Drugs 0.000 description 1
- 239000004281 calcium formate Substances 0.000 description 1
- 235000019255 calcium formate Nutrition 0.000 description 1
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 1
- 239000008116 calcium stearate Substances 0.000 description 1
- 235000013539 calcium stearate Nutrition 0.000 description 1
- 235000013339 cereals Nutrition 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000007863 gel particle Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011325 microbead Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 239000010451 perlite Substances 0.000 description 1
- 235000019362 perlite Nutrition 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229910052911 sodium silicate Inorganic materials 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses a preparation method of foam concrete, which comprises the following steps: iron removal treatment is carried out on the garbage bottom slag; soaking and screening garbage bottom slag immersed in the water bottom; limestone and rice hull ash are added into the separated garbage bottom slag, and the mixture is placed in an acid solution for wet grinding, and then dried to obtain garbage bottom slag powder; crushing the water slag, screening particles with the particle diameter of less than 2mm, immersing in water, and then air-drying; air-drying rice hulls to constant weight, immersing the rice hulls in an acidic soaking solution, adding a calcium hydroxide solution to adjust pH after soaking, taking out and air-drying; adding alkaline nano silica sol and calcium hydroxide into water, stirring, and then adding a foaming agent for foaming; and (3) weighing cement, garbage bottom slag powder, water slag particles, pretreated rice hulls and water, uniformly mixing to obtain cement paste, adding the foam obtained in the step (S4) into the cement paste, uniformly stirring, and pouring into a test die. The foam concrete is prepared from the garbage bottom slag and the rice hull ash, so that the problems that the foam concrete is low in strength, easy to shrink and crack and difficult to utilize are solved.
Description
Technical Field
The invention belongs to the technical field of foam concrete, relates to preparation of foam concrete, and in particular relates to a method for preparing foam concrete by adopting garbage bottom slag and rice hull ash.
Background
The foam concrete is a porous light concrete composed of cement matrix, auxiliary material and pores. Compared with the traditional concrete, the foam concrete has the advantages of high fluidity, low density, good heat preservation, heat insulation, sound insulation and the like, and is widely paid attention to students at home and abroad. However, the foam concrete also has the defects of low strength, large drying shrinkage, easiness in cracking and the like, and the large-scale application of the foam concrete is limited.
The method for improving the strength of the foam concrete comprises the following steps: inorganic early strength agents (calcium chloride, calcium formate, calcium nitrate, calcium stearate, magnesium salt or aluminum salt) are adopted, ordinary silicate cement and sulphoaluminate cement are adopted for compounding, and alkali (sodium silicate and sodium hydroxide) is adopted for exciting slag and the like.
The method for reducing the shrinkage of the foam concrete comprises the following steps: adopts fiber (alkali-resistant glass fiber, vinylon fiber, polypropylene fiber, acrylic fiber, polypropylene fiber and the like), filler (polystyrene particles, perlite, glass bead particles or waste polyurethane particles, vitrified microbeads and slag) and slag as lightweight aggregate, composite expanding agent, caO and CaSO 3 And (5) expanding cement.
In addition, in recent years, garbage incineration power generation is the best way to treat household garbage in a "reduced, harmless and resource" manner. The ash (fly ash and bottom slag) generated by the incineration of the household garbage is collected in a classified way, wherein the fly ash accounts for about 20% of the total mass of the ash, the bottom slag accounts for about 80% of the total mass of the ash, and the treatment and comprehensive utilization of the ash are gradually attracting attention.
Because the household garbage incineration bottom slag contains metal, stone, glass, unburnt organic matters, wood blocks and the like, and is also rich in soluble chlorine, heavy metal ions and the like. At present, the ground garbage incineration bottom slag is used as a main utilization mode of the concrete mineral admixture, but the garbage bottom slag has complex components and low activity, and the application of the garbage bottom slag as the mineral admixture in the concrete can reduce the strength of the concrete, so the garbage incineration bottom slag is difficult to utilize.
Therefore, the invention combines the garbage bottom slag and the foam concrete to solve the problems that the garbage bottom slag is difficult to use and the foam concrete is easy to shrink and crack.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a preparation method of foam concrete, which selects garbage bottom slag and rice hull ash to prepare the foam concrete, and solves the problems that the foam concrete has low strength, is easy to shrink and crack and is difficult to utilize.
The invention is realized by the following technical scheme:
a preparation method of foam concrete comprises the following steps:
s1: preparation of garbage bottom slag powder
Iron removal treatment is carried out on the garbage bottom slag; soaking and screening garbage bottom slag immersed in the water bottom; limestone and rice hull ash are added into the separated garbage bottom slag, and the mixture is placed in an acid solution for wet grinding, and then the mixture is dried to obtain garbage bottom slag powder;
s2: preparation of granulated slag particles
Crushing water slag, screening particles with the particle diameter of less than 2mm, immersing in water for 3-5 days, and then air-drying until no clear water is on the surface for use;
s3: pretreatment of rice hulls
Air-drying rice hulls to constant weight, immersing the rice hulls in an acidic soaking solution for 1-3 hours, adding calcium hydroxide to neutralize the solution, adjusting the pH value of the solution to 8-9, taking out the rice hulls, and naturally air-drying the rice hulls until the surface of the rice hulls is free of clear water;
s4: foaming
Respectively adding alkaline nano silica sol and calcium hydroxide into water, stirring for 1-5 minutes, then adding a foaming agent, and foaming by adopting a foaming machine;
s5: preparation of foam concrete
And (3) weighing cement, garbage bottom slag powder, granulated slag particles, pretreated rice hulls and water according to a proportion, uniformly stirring to obtain cement paste, adding the foam obtained in the step (S4) into the cement paste, uniformly stirring, and pouring into a test die.
The invention further improves the scheme as follows:
further, in the process of preparing the foam concrete in S5, the weight parts of the raw materials are as follows: 200-400 parts of cement, 100-200 parts of granulated slag, 100-300 parts of garbage bottom slag powder, 10-30 parts of pretreated rice hulls, 5-10 parts of foaming agent in foam and 200-400 parts of water.
Further, the acid solution in S1 and S3 is one or more of hydrochloric acid solution, formic acid solution or acetic acid solution, and the concentration of the acid solution is 0.005-0.030 mol/L.
Further, in S4, the mass ratio of the foaming agent to the alkaline nano silica sol to the calcium hydroxide to the water is 1: 10-20: 10-20: 200-500.
Further, in the step S1, the mass ratio of the garbage bottom slag, the limestone and the rice hull ash in the garbage bottom slag powder is as follows: 40% -60%: 20% -30%: 20% -30%.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention improves grinding efficiency by accelerating the destruction of the structure of the garbage bottom slag under the double conditions of mechanical force and acid erosion through wet grinding of the low-concentration acid solution, improves the composition of the garbage bottom slag powder through the compounding of limestone and rice hull ash, and can improve the structure of the rice hull ash, reduce the water absorption and improve the activity of the rice hull ash through mechanical force and acid erosion.
2. The invention screens grain slag, rice husk and the like which are used as aggregate in foam concrete, thereby reducing the shrinkage of the foam concrete; the structure of the water slag particles is destroyed by crushing, soaking and the like, and porous products can be formed around the water slag particles by the slow reaction of the water slag and water, so that the water absorption of the water slag particles is improved, the volume weight of the water slag particles can be adjusted according to the water absorption of the water slag particles, floating and sedimentation of the water slag particles in foam concrete are avoided, in addition, the water absorbed by holes and cracks on the surfaces of the water slag particles can be used for supplementing water for the concrete when the foam concrete lacks water, and the shrinkage of the foam concrete is reduced;
3. the rice hulls are treated by adopting acid solution, so that the fiber structure of the rice hulls is damaged, the flexibility of the rice hulls is improved, and the damage to bubbles in the stirring process is avoided.
4. The nano silica sol, calcium hydroxide and the like are added into water to improve the pH value of the water, and nano hydrated calcium silicate gel is generated through the reaction of the nano silica sol and the calcium hydroxide, in the environment of the solution, the foaming agent foams by taking nano hydrated calcium silicate gel particles as nucleation points, the bubble particle size is uniform, and meanwhile, the environment is similar to the environment of cement paste (hydration products of the cement paste are mainly hydrated calcium silicate), and the foam is not easy to break when being added into the environment of the cement paste.
5. Rice husk ash SiO 2 The high content, its reaction with the later pozzolan of the cement slurry ensures the later strength of the foam concrete.
Detailed Description
The present invention will be described in detail with reference to specific examples.
Example 1
S1: preparation of garbage bottom slag powder
Iron removal treatment is carried out on the garbage bottom slag; soaking and screening garbage bottom slag immersed in the water bottom; limestone and rice hull ash are added into the separated garbage bottom slag, and the mixture is put into 0.01mol/L hydrochloric acid solution for wet grinding, and then dried to obtain garbage bottom slag powder with the grinding fineness of 400m 2 /kg; the mass ratio of the garbage bottom slag, the limestone and the rice hull ash in the obtained garbage bottom slag powder is as follows: 50%:30%:20% of a base;
s2: preparation of granulated slag particles
Crushing water slag, screening particles with the particle diameter of less than 2mm, immersing in water for 5 days, and then air-drying until no clear water is on the surface for use;
s3: pretreatment of rice hulls
Air-drying rice hulls to constant weight, immersing the rice hulls in 0.03mol/L acetic acid soaking solution for 1 hour, adding calcium hydroxide neutralization solution, adjusting the pH value of the solution to 9, taking out the rice hulls, and naturally air-drying the rice hulls until no clear water exists on the surface;
s4: foaming
Respectively adding alkaline nano silica sol and calcium hydroxide into water, stirring for 5 minutes, then adding an animal protein foaming agent, and foaming by adopting a foaming machine; the foaming agent, the alkaline nano silica sol, the calcium hydroxide and the water are in mass ratio: 1:10:20:500.
s5: preparation of foam concrete
And (3) weighing cement, garbage bottom slag powder, granulated slag particles, pretreated rice hulls and water according to a proportion, uniformly stirring to obtain cement paste, adding the foam obtained in the step (S4) into the cement paste, uniformly stirring, and pouring into a test die. Wherein the weight portion of each raw material is as follows: 400 parts of cement, 100 parts of granulated slag, 100 parts of garbage bottom slag powder, 10 parts of pretreated rice hulls, 5 parts of foaming agent contained in foam and 200 parts of water.
Example 2
S1: preparation of garbage bottom slag powder
Iron removal treatment is carried out on the garbage bottom slag; soaking and screening garbage bottom slag immersed in the water bottom; limestone and rice hull ash are added into the separated garbage bottom slag, and the mixture is put into 0.005mol/L formic acid solution for wet grinding, and then dried to obtain garbage bottom slag powder with the grinding fineness of 400m 2 /kg; the mass ratio of the garbage bottom slag, the limestone and the rice hull ash in the obtained garbage bottom slag powder is as follows: 50%:20%:30%;
s2: preparation of granulated slag particles
Crushing water slag, screening particles with the particle diameter of less than 2mm, immersing in water for 3 days, and then air-drying until no clear water is on the surface for use;
s3: pretreatment of rice hulls
Air-drying rice hulls to constant weight, immersing the rice hulls in 0.005mol/L hydrochloric acid soaking solution for 3 hours, adding calcium hydroxide neutralization solution, adjusting the pH value of the solution to 8, taking out the rice hulls, and naturally air-drying the rice hulls until no clear water exists on the surface;
s4: foaming
Respectively adding alkaline nano silica sol and calcium hydroxide into water, stirring for 1 minute, then adding animal protein foaming agent, and foaming by adopting a foaming machine; wherein, the mass ratio of the foaming agent to the alkaline nano silica sol to the calcium hydroxide to the water is: 1:20:10:200.
s5: preparation of foam concrete
And (3) weighing cement, garbage bottom slag powder, granulated slag particles, pretreated rice hulls and water according to a proportion, uniformly stirring to obtain cement paste, adding the foam obtained in the step (S4) into the cement paste, uniformly stirring, and pouring into a test die. 300 parts of cement, 200 parts of granulated slag, 300 parts of garbage bottom slag powder, 30 parts of pretreated rice hulls, 10 parts of foaming agent contained in foam and 400 parts of water.
Example 3
S1: preparation of garbage bottom slag powder
Garbage bottomIron removal treatment is carried out on the slag; soaking and screening garbage bottom slag immersed in the water bottom; limestone and rice hull ash are added into the separated garbage bottom slag, and the mixture is put into 0.030mol/L acetic acid solution for wet grinding, and then dried to obtain garbage bottom slag powder with the grinding fineness of 400m 2 /kg; the mass ratio of the garbage bottom slag, the limestone and the rice hull ash in the obtained garbage bottom slag powder is as follows: 40%:30%:30%;
s2: preparation of granulated slag particles
Crushing water slag, screening particles with the particle diameter of less than 2mm, immersing in water for 4 days, and then air-drying until no clear water is on the surface for use;
s3: pretreatment of rice hulls
Air-drying rice hulls to constant weight, immersing the rice hulls in 0.02mol/L hydrochloric acid soaking solution for 1.5 hours, adding calcium hydroxide neutralization solution, adjusting the pH value of the solution to 9, taking out the rice hulls, and naturally air-drying the rice hulls until no clear water exists on the surface;
s4: foaming
Respectively adding alkaline nano silica sol and calcium hydroxide into water, stirring for 3 minutes, then adding an animal protein foaming agent, and foaming by adopting a foaming machine; wherein, the mass ratio of the foaming agent to the alkaline nano silica sol to the calcium hydroxide to the water is: 1:10:10:300.
s5: preparation of foam concrete
And (3) weighing cement, garbage bottom slag powder, granulated slag particles, pretreated rice hulls and water according to a proportion, uniformly stirring to obtain cement paste, adding the foam obtained in the step (S4) into the cement paste, uniformly stirring, and pouring into a test die. Wherein, the weight portion ratio of each raw material is: 200 parts of cement, 100 parts of granulated slag, 200 parts of garbage bottom slag powder, 20 parts of pretreated rice hulls, 6 parts of foaming agent in foam and 300 parts of water.
Example 4
S1: preparation of garbage bottom slag powder
Iron removal treatment is carried out on the garbage bottom slag; soaking and screening garbage bottom slag immersed in the water bottom; limestone and rice hull ash are added into the separated garbage bottom slag, and the mixture is put into 0.015mol/L hydrochloric acid solution for wet grinding, and then dried to obtain garbage bottom slag powder with the grinding fineness of 400m 2 /kg; the obtained productThe mass ratio of the garbage bottom slag, the limestone and the rice hull ash in the garbage bottom slag powder is as follows: 60 percent: 20%:20% of a base;
s2: preparation of granulated slag particles
Crushing water slag, screening particles with the particle diameter of less than 2mm, immersing in water for 4 days, and then air-drying until no clear water is on the surface for use;
s3: pretreatment of rice hulls
Air-drying rice hulls to constant weight, immersing the rice hulls in 0.015mol/L formic acid soaking solution for 2 hours, adding calcium hydroxide neutralization solution, adjusting the pH value of the solution to 9, and taking out the rice hulls to be naturally air-dried until no surface water exists;
s4: foaming
Respectively adding alkaline nano silica sol and calcium hydroxide into water, stirring for 3 minutes, then adding an animal protein foaming agent, and foaming by adopting a foaming machine; wherein, the mass ratio of the foaming agent to the alkaline nano silica sol to the calcium hydroxide to the water is: 1:15:15:300.
s5: preparation of foam concrete
Weighing cement, garbage bottom slag powder, granulated slag particles, pretreated rice hulls and water according to a proportion and stirring uniformly to obtain cement paste, adding the foam obtained in the step S4 into the cement paste, stirring uniformly, and pouring into a test mould, wherein the weight proportion of the raw materials is as follows: 300 parts of cement, 150 parts of granulated slag, 200 parts of garbage bottom slag powder, 15 parts of pretreated rice hulls, 10 parts of foaming agent contained in foam and 300 parts of water.
Performance detection
Table 1 shows performance evaluation indexes of the invention, wherein the performance evaluation indexes of the foam concrete are carried out according to the following procedures of foam concrete (JGJ 266-2011), foam concrete application technical specification (JGJ/T341-2014) and the like, and the mixing ratio of the foam concrete is 52.5 cement 500 parts, water 200 parts and animal protein foaming agent 4 parts.
As can be seen from Table 1, the foam concrete prepared by the invention has better performances than the comparative samples in terms of strength at each age, 28d sedimentation rate (related to breakage rate of foam), 90d drying shrinkage and the like.
TABLE 1
The technical means disclosed by the scheme of the invention is not limited to the technical means disclosed by the embodiment, and also comprises the technical scheme formed by any combination of the technical features. It should be noted that modifications and adaptations to the invention may occur to one skilled in the art without departing from the principles of the present invention and are intended to be within the scope of the present invention.
Claims (5)
1. The preparation method of the foam concrete is characterized by comprising the following steps of:
s1: preparation of garbage bottom slag powder
Iron removal treatment is carried out on the garbage bottom slag; soaking and screening garbage bottom slag immersed in the water bottom; limestone and rice hull ash are added into the separated garbage bottom slag, and the mixture is placed in an acid solution for wet grinding, and then the mixture is dried to obtain garbage bottom slag powder;
s2: preparation of granulated slag particles
Crushing water slag, screening particles with the particle diameter of less than 2mm, immersing in water for 3-5 days, and then air-drying until no clear water is on the surface for use;
s3: pretreatment of rice hulls
Air-drying rice hulls to constant weight, immersing the rice hulls in an acidic soaking solution for 1-3 hours, adding calcium hydroxide to neutralize the solution, adjusting the pH value of the solution to 8-9, taking out the rice hulls, and naturally air-drying the rice hulls until the surface is free of clear water;
s4: foaming
Respectively adding alkaline nano silica sol and calcium hydroxide into water, stirring for 1-5 minutes, then adding a foaming agent, and foaming by adopting a foaming machine;
s5: preparation of foam concrete
And (3) weighing cement, garbage bottom slag powder, granulated slag particles, pretreated rice hulls and water according to a proportion, uniformly stirring to obtain cement paste, adding the foam obtained in the step (S4) into the cement paste, uniformly stirring, and pouring into a test die.
2. The method for preparing foam concrete according to claim 1, wherein: in the S5 process of preparing the foam concrete, the weight parts of the raw materials are as follows: 200-400 parts of cement, 100-200 parts of granulated slag, 100-300 parts of garbage bottom slag powder, 10-30 parts of pretreated rice hulls, 5-10 parts of foaming agent in foam and 200-400 parts of water.
3. The method for preparing foam concrete according to claim 1, wherein: the acid solution in S1 and S3 is one or more than two of hydrochloric acid solution, formic acid solution or acetic acid solution, and the concentration of the acid solution is 0.005-0.030 mol/L.
4. The method for preparing foam concrete according to claim 1, wherein: and S4, the mass ratio of the foaming agent to the alkaline nano silica sol to the calcium hydroxide to the water is 1: 10-20: 10-20: 200-500.
5. The method for preparing foam concrete according to claim 1, wherein: the mass ratio of the garbage bottom slag, the limestone and the rice hull ash in the garbage bottom slag powder in S1 is as follows: 40% -60%: 20% -30%: 20% -30%.
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| WO2022028047A1 (en) * | 2020-08-04 | 2022-02-10 | 山东大学 | High-strength concrete and preparation method therefor |
| CN114044665A (en) * | 2021-10-25 | 2022-02-15 | 淮阴工学院 | Assembled aerated concrete plate prepared from garbage bottom slag and preparation method thereof |
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| CN101054280A (en) * | 2007-04-06 | 2007-10-17 | 河南理工大学 | Plant fiber enhanced color clinker solid brick and preparation method thereof |
| CN108395170A (en) * | 2018-02-06 | 2018-08-14 | 嘉兴学院 | A kind of cement insulation board based on foam concrete waste material |
| CN208379895U (en) * | 2018-07-03 | 2019-01-15 | 赵军 | Non-bearing environment-friendly type heat insulation building block and non-bearing masonry wall |
| WO2022028047A1 (en) * | 2020-08-04 | 2022-02-10 | 山东大学 | High-strength concrete and preparation method therefor |
| CN114044665A (en) * | 2021-10-25 | 2022-02-15 | 淮阴工学院 | Assembled aerated concrete plate prepared from garbage bottom slag and preparation method thereof |
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