CN115893948B - Rubber lithium slag powder concrete and preparation method thereof - Google Patents
Rubber lithium slag powder concrete and preparation method thereof Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 128
- 239000002893 slag Substances 0.000 title claims abstract description 116
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 104
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 100
- 238000002360 preparation method Methods 0.000 title claims abstract description 19
- 239000002245 particle Substances 0.000 claims abstract description 108
- 238000003756 stirring Methods 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 33
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims abstract description 30
- 239000012948 isocyanate Substances 0.000 claims abstract description 25
- 150000002513 isocyanates Chemical class 0.000 claims abstract description 25
- 238000002156 mixing Methods 0.000 claims abstract description 23
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 21
- 239000003054 catalyst Substances 0.000 claims abstract description 17
- 239000004568 cement Substances 0.000 claims abstract description 17
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 16
- 239000004576 sand Substances 0.000 claims abstract description 16
- 239000004575 stone Substances 0.000 claims abstract description 15
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 13
- 239000011707 mineral Substances 0.000 claims abstract description 13
- 239000002994 raw material Substances 0.000 claims abstract description 12
- 238000005530 etching Methods 0.000 claims abstract description 9
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 150000002641 lithium Chemical class 0.000 claims description 12
- 238000000498 ball milling Methods 0.000 claims description 11
- UUEWCQRISZBELL-UHFFFAOYSA-N 3-trimethoxysilylpropane-1-thiol Chemical compound CO[Si](OC)(OC)CCCS UUEWCQRISZBELL-UHFFFAOYSA-N 0.000 claims description 10
- 229920000858 Cyclodextrin Polymers 0.000 claims description 10
- 239000001116 FEMA 4028 Substances 0.000 claims description 10
- WHGYBXFWUBPSRW-FOUAGVGXSA-N beta-cyclodextrin Chemical compound OC[C@H]([C@H]([C@@H]([C@H]1O)O)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O3)[C@H](O)[C@H]2O)CO)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@@H]3O[C@@H]1CO WHGYBXFWUBPSRW-FOUAGVGXSA-N 0.000 claims description 10
- 235000011175 beta-cyclodextrine Nutrition 0.000 claims description 10
- 229960004853 betadex Drugs 0.000 claims description 10
- 239000002002 slurry Substances 0.000 claims description 10
- 239000002904 solvent Substances 0.000 claims description 10
- 238000004381 surface treatment Methods 0.000 claims description 9
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 8
- 238000001035 drying Methods 0.000 claims description 8
- 239000000203 mixture Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 239000007787 solid Substances 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 4
- 238000005406 washing Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 6
- 230000000052 comparative effect Effects 0.000 description 33
- 238000006703 hydration reaction Methods 0.000 description 13
- 230000036571 hydration Effects 0.000 description 9
- 230000007547 defect Effects 0.000 description 7
- 239000004971 Cross linker Substances 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- 238000007710 freezing Methods 0.000 description 4
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 4
- 238000010998 test method Methods 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 238000004132 cross linking Methods 0.000 description 3
- 230000008014 freezing Effects 0.000 description 3
- 229920005646 polycarboxylate Polymers 0.000 description 3
- KSBAEPSJVUENNK-UHFFFAOYSA-L tin(ii) 2-ethylhexanoate Chemical group [Sn+2].CCCCC(CC)C([O-])=O.CCCCC(CC)C([O-])=O KSBAEPSJVUENNK-UHFFFAOYSA-L 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 239000003469 silicate cement Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000008093 supporting effect Effects 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- CNLWCVNCHLKFHK-UHFFFAOYSA-N aluminum;lithium;dioxido(oxo)silane Chemical compound [Li+].[Al+3].[O-][Si]([O-])=O.[O-][Si]([O-])=O CNLWCVNCHLKFHK-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000002528 anti-freeze Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 description 1
- 239000000920 calcium hydroxide Substances 0.000 description 1
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 1
- 239000000378 calcium silicate Substances 0.000 description 1
- 229910052918 calcium silicate Inorganic materials 0.000 description 1
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 1
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 1
- 229910052808 lithium carbonate Inorganic materials 0.000 description 1
- 238000007589 penetration resistance test Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 229910052642 spodumene Inorganic materials 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
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
The application discloses rubber lithium slag powder concrete and a preparation method thereof, and belongs to the field of concrete. The rubber lithium slag powder concrete raw material comprises 20-30 parts of cement, 5-6.5 parts of lithium slag powder, 4.5-6 parts of mineral powder, 12-16 parts of rubber particles, 6.5-7.6 parts of aqueous silica sol, 4.8-5.6 parts of aqueous closed isocyanate crosslinking agent, 0.02-0.05 part of catalyst, 78-82 parts of machine-made sand, 85-90 parts of crushed stone, 0.6-0.8 part of water reducer and 15-20 parts of water. The preparation method comprises the following steps: etching the surfaces of the rubber particles; stirring and mixing rubber particles and lithium slag powder, then adding aqueous silica sol, aqueous closed isocyanate crosslinking agent and catalyst, heating and stirring to obtain a rubber particle premix; and stirring and mixing the raw materials to prepare the rubber lithium slag powder concrete. The present application has the effect of obtaining concrete with good compressive strength and ductility.
Description
Technical Field
The application relates to the field of concrete, in particular to rubber lithium slag powder concrete and a preparation method thereof.
Background
With the continuous improvement of industrial productivity, the produced waste rubber is more and more, and the waste rubber is difficult to degrade under natural conditions, so that serious black pollution is caused, and huge pressure is brought to the environment, so that the recycling of the waste rubber becomes the trend of the current technology development.
At present, waste rubber is often used for preparing concrete, and is added into concrete aggregate in a rubber particle mode. The ductility and other properties of the concrete are generally poor, and the problem can be improved by adding the rubber particles, the rubber particles can form a structural deformation center for absorbing strain in the concrete, and the damage of stress to the structure is reduced, so that the ductility of the concrete is improved.
However, in practical application, the addition of the rubber particles can cause the compressive strength of the concrete to be greatly reduced, and the popularization and application of the concrete added with the rubber particles are affected.
Disclosure of Invention
In order to obtain concrete with good compressive strength and ductility, the application provides rubber lithium slag powder concrete and a preparation method thereof.
In a first aspect, the rubber lithium slag powder concrete provided by the application adopts the following technical scheme:
the rubber lithium slag powder concrete comprises the following raw materials in parts by weight:
20-30 parts of cement;
5 to 6.5 portions of lithium slag powder;
4.5-6 parts of mineral powder;
12-16 parts of rubber particles;
6.5 to 7.6 portions of aqueous silica sol;
4.8 to 5.6 portions of water-based closed isocyanate crosslinking agent;
0.02-0.05 part of catalyst;
78-82 parts of machine-made sand;
85-90 parts of crushed stone;
0.6 to 0.8 portion of water reducer;
15-20 parts of water.
By adopting the technical scheme, the lithium slag powder is the residue discharged after the spodumene is calcined at the high temperature of 1150-1300 ℃ and then the lithium carbonate clinker extracted by the sulfuric acid solution method is leached and washed. The lithium slag powder can accelerate early hydration of cement, and a large amount of SiO in the lithium slag powder 2 、Al 2 O 3 Can react with calcium hydroxide as cement hydration product to produce waterAnd (3) dissolving secondary hydration products such as calcium silicate, calcium aluminate hydrate and the like, and improving the later strength and durability of the concrete.
The addition amount of the rubber particles is large, the rubber particles account for about 15% of the machine-made sand, and good strength is still obtained.
The aqueous silica sol and the aqueous closed isocyanate crosslinking agent play a role in coating rubber particles, after the aqueous closed isocyanate crosslinking agent is unsealed, the isocyanate groups are subjected to a crosslinking reaction with the silicon hydroxyl groups on the surface of the aqueous silica sol, a polymeric covering is formed on the surface of the rubber particles, the original surface inertia of the rubber particles can be improved by the covering, lithium slag powder is combined with the rubber particles under the action of the covering, when the lithium slag powder participates in the hydration reaction, hydration products and secondary hydration products can be closely attached to the surfaces of the rubber particles and even enter the defects of the rubber particles, the structural supporting effect is achieved on the rubber particles, the interfacial bonding capability of the rubber particles and the cement groups is improved, the conditions of large pore defects are reduced, the weakening of the rubber particles to the compressive strength of concrete is effectively improved, the ductility of the rubber particles to the concrete is kept, and the impervious effect of the concrete is good.
Optionally, the lithium slag powder is modified lithium slag powder, and the preparation raw materials of the modified lithium slag powder comprise (0.08-0.12) lithium slag powder (0.8-1.5) gamma-mercaptopropyl trimethoxysilane and a solvent according to the weight ratio of 1.
By adopting the technical scheme, the gamma-mercaptopropyl trimethoxy silane is used for modifying the lithium slag powder, so that the interface bonding capability of the surface of the lithium slag powder and rubber particles is improved, the bonding of the lithium slag powder and the rubber particles is promoted, the stable connection of the rubber particles, secondary hydration products and cement base is facilitated, and the compressive strength of concrete is improved.
Optionally, the raw materials also comprise 1.2 to 1.8 parts by weight of beta-cyclodextrin.
By adopting the technical scheme, the beta-cyclodextrin is doped in the crosslinking system of the isocyanate groups and the aqueous silica sol, and the beta-cyclodextrin can be further combined with the isocyanate groups in a reaction way, so that the hydrophilicity of the surface coverings of the rubber particles is improved, the hydration reaction of the surfaces of the rubber particles is promoted, the compressive strength of the concrete is improved, and the freezing resistance of the concrete is improved.
Optionally, the particle size of the aqueous silica sol is 60-90 nm, and the solid content is 12-15%.
By adopting the technical scheme, siO in the aqueous silica sol 2 Good dispersion and presumably better flexibility of the formed polymeric cover, thereby allowing for simultaneous improvement of compressive strength and ductility of the concrete.
Optionally, the particle size of the rubber particles is 800-900 μm, and the particle size of the lithium slag powder is 55-60 μm.
By adopting the technical scheme, the combination of the lithium slag powder and the rubber particles is facilitated under the cooperation of the particle size range.
Optionally, the water reducer is a polycarboxylate water reducer.
Optionally, the catalyst is stannous octoate.
In a second aspect, the preparation method of the rubber lithium slag powder concrete provided by the application adopts the following technical scheme:
the preparation method of the rubber lithium slag powder concrete comprises the following steps:
s1, adding rubber particles into etching solution, stirring and mixing, filtering, washing with water and drying to obtain rubber particles subjected to surface treatment; s2, stirring and mixing the rubber particles subjected to surface treatment with lithium slag powder, then adding aqueous silica sol, aqueous closed isocyanate crosslinking agent and catalyst, continuously stirring for 0.3-0.8 h, heating to 90-95 ℃, continuously stirring until the mixture is dried, and obtaining a rubber particle premix;
s3, stirring and mixing the rubber particle premix, the mineral powder, the machine-made sand and the broken stone, then adding cement, continuing to stir and mix, then adding the water reducer and the water, and continuing to stir and mix to prepare the rubber lithium slag powder concrete.
By adopting the technical scheme, the etching liquid etches the rubber particles to form uneven surface defects, which is favorable for the adhesion of lithium slag powder or the entering of the lithium slag powder into the defects of the rubber particles, thereby fully playing the role of the lithium slag powder in hydration reaction.
The method comprises the steps of firstly stirring and mixing rubber particles and lithium slag powder, enabling the lithium slag powder to fully contact with the surfaces of the rubber particles, then forming a polymerization covering by utilizing aqueous silica sol and aqueous closed isocyanate crosslinking agent, enabling the lithium slag powder to be tightly combined with the surfaces of the rubber particles, enabling part of the lithium slag powder to be embedded into the covering, and promoting hydration products of lithium slag powder reaction to be combined with the rubber particles.
Optionally, the etching solution is a sulfuric acid solution with the weight percent of 40-50.
By adopting the technical scheme, the sulfuric acid solution with the weight percent of 40-50 percent has good etching effect on the surfaces of the rubber particles, so that the surface defects for combining lithium slag powder are formed.
Optionally, in the step S2, adding the aqueous silica sol, the aqueous blocked isocyanate crosslinking agent and the catalyst, and adding 1.2-1.8 parts by weight of beta-cyclodextrin.
By adopting the technical scheme, the compressive strength and the frost resistance of the concrete are improved.
Optionally, the lithium slag powder is modified lithium slag powder, and the preparation method of the modified lithium slag powder comprises the following steps: mixing lithium slag powder, gamma-mercaptopropyl trimethoxysilane and a solvent according to the weight ratio of 1 (0.08-0.12) (0.8-1.5) to obtain slurry, ball-milling the slurry at 45-55 ℃, and drying after ball milling to obtain the modified lithium slag powder.
By adopting the technical scheme, the lithium slag powder obtains finer particle size under the action of ball milling, and the activity of the lithium slag powder is excited, so that the grafting of gamma-mercaptopropyl trimethoxy silane is promoted, and the combination of the lithium slag powder and rubber particles is facilitated.
In summary, the present application has the following beneficial effects:
1. the addition amount of the rubber particles is large, the rubber particles account for about 15% of the usage amount of the machine-made sand, and good strength is still obtained; the aqueous silica sol and the aqueous closed isocyanate crosslinking agent play a role in coating rubber particles, after the aqueous closed isocyanate crosslinking agent is unsealed, the isocyanate groups are subjected to a crosslinking reaction with the silicon hydroxyl groups on the surface of the aqueous silica sol, a polymeric covering is formed on the surface of the rubber particles, the original surface inertia of the rubber particles can be improved by the covering, lithium slag powder is combined with the rubber particles under the action of the covering, when the lithium slag powder participates in the hydration reaction, hydration products and secondary hydration products can be closely attached to the surfaces of the rubber particles and even enter the defects of the rubber particles, the structural supporting effect is achieved on the rubber particles, the interfacial bonding capability of the rubber particles and the cement groups is improved, the conditions of large pore defects are reduced, the weakening of the rubber particles to the compressive strength of concrete is effectively improved, the ductility of the rubber particles to the concrete is kept, and the impervious effect of the concrete is good.
2. The beta-cyclodextrin is further added to cover the surfaces of the rubber particles, so that the binding capacity of the lithium slag powder and the rubber particles is improved, and the compressive strength and the freezing resistance of the concrete are improved.
Detailed Description
The present application is described in further detail below.
Preparation example
Preparation example 1
The preparation method of the modified lithium slag powder comprises the following steps:
weighing 10kg of lithium slag powder, 0.8kg of gamma-mercaptopropyl trimethoxysilane and 8kg of solvent. The solvent is specifically 90wt% ethanol.
Stirring and mixing lithium slag powder with the particle size of 200-230 mu m, gamma-mercaptopropyl trimethoxy silane and a solvent to obtain slurry, adding the slurry into ball milling equipment, ball milling at 55 ℃ until the particle size of the lithium slag powder is 55-60 mu m, and drying the slurry after ball milling to obtain the modified lithium slag powder.
The preparation method of the modified lithium slag powder comprises the following steps:
weighing 10kg of lithium slag powder, 1.2kg of gamma-mercaptopropyl trimethoxysilane and 15kg of solvent. The solvent is specifically 90wt% ethanol.
Stirring and mixing lithium slag powder with the particle size of 200-230 mu m, gamma-mercaptopropyl trimethoxy silane and a solvent to obtain slurry, adding the slurry into ball milling equipment, ball milling at 45 ℃ until the particle size of the lithium slag powder is 55-60 mu m, and drying the slurry after ball milling to obtain the modified lithium slag powder.
Examples
Example 1
The rubber lithium slag powder concrete comprises the following raw materials:
20kg of cement, 5kg of lithium slag powder, 4.5kg of mineral powder, 12kg of rubber particles, 6.5kg of aqueous silica sol, 4.8kg of aqueous closed isocyanate crosslinking agent, 0.02kg of catalyst, 78kg of machine-made sand, 85kg of crushed stone, 0.6kg of water reducer and 15kg of water.
Wherein the cement is P.O42.5 silicate cement, the particle size of lithium slag powder is 55-60 mu m, the particle size of rubber particles is 800-820 mu m, the particle size of aqueous silica sol is 10-40 nm, the solid content is 30%, the aqueous closed isocyanate crosslinking agent is three-well chemical XB-G282, the deblocking temperature is 80 ℃, the catalyst is stannous octoate, the fineness modulus of machine-made sand is 3.2, broken stone is 5-25mm continuous particle-size broken stone, and the water reducer is a polycarboxylate water reducer.
The preparation method comprises the following steps:
s1, adding rubber particles into etching solution, stirring and mixing for 20min, filtering, collecting a filter body, washing the filter body with water, and drying to obtain the rubber particles subjected to surface treatment.
S2, stirring and mixing the rubber particles subjected to surface treatment with lithium slag powder for 10min, then adding the aqueous silica sol and the aqueous blocked isocyanate crosslinking agent, continuously stirring for 0.8h, then heating to 90 ℃, continuously stirring until the mixture is dried, and obtaining the rubber particle premix.
S3, stirring and mixing the rubber particle premix, the mineral powder, the machine-made sand and the broken stone for 5min, then adding cement, continuously stirring and mixing for 3min, then adding the water reducer and the water, and continuously stirring and mixing for 2min to obtain the rubber lithium slag powder concrete.
Example 2
The rubber lithium slag powder concrete comprises the following raw materials:
30kg of cement, 6.5kg of lithium slag powder, 6kg of mineral powder, 16kg of rubber particles, 7.6kg of aqueous silica sol, 5.6kg of aqueous closed isocyanate crosslinking agent, 0.05kg of catalyst, 82kg of machine-made sand, 90kg of broken stone, 0.8kg of water reducer and 20kg of water.
Wherein the cement is P.O42.5 silicate cement, the particle size of lithium slag powder is 55-60 mu m, the particle size of rubber particles is 860-900 mu m, the particle size of aqueous silica sol is 10-40 nm, the solid content is 30%, the aqueous closed isocyanate crosslinking agent is three-well chemical XB-G282, the deblocking temperature is 80 ℃, the catalyst is stannous octoate, the fineness modulus of machine-made sand is 3.2, broken stone is 5-25mm continuous particle-size broken stone, and the water reducer is a polycarboxylate water reducer.
The preparation method comprises the following steps:
s1, adding rubber particles into etching solution, stirring and mixing for 20min, filtering, collecting a filter body, washing the filter body with water, and drying to obtain the rubber particles subjected to surface treatment.
S2, stirring and mixing the rubber particles subjected to surface treatment with lithium slag powder for 10min, then adding the aqueous silica sol and the aqueous blocked isocyanate crosslinking agent, continuously stirring for 0.3h, then heating to 95 ℃, continuously stirring until the mixture is dried, and obtaining the rubber particle premix.
S3, stirring and mixing the rubber particle premix, the mineral powder, the machine-made sand and the broken stone for 5min, then adding cement, continuously stirring and mixing for 3min, then adding the water reducer and the water, and continuously stirring and mixing for 2min to obtain the rubber lithium slag powder concrete.
Example 3
The difference between this embodiment and embodiment 1 is that the raw material ratio of the rubber lithium slag powder concrete of this embodiment is different, specifically: 23kg of cement, 5.6kg of lithium slag powder, 5kg of mineral powder, 14kg of rubber particles, 7.2kg of aqueous silica sol, 5.1kg of aqueous closed isocyanate crosslinking agent, 0.03kg of catalyst, 80kg of machine-made sand, 86kg of crushed stone, 0.75kg of water reducer and 18kg of water.
Example 4
This example differs from example 3 in that the lithium slag powder in this example is the modified lithium slag powder produced in production example 1.
Example 5
This example differs from example 3 in that the lithium slag powder in this example is the modified lithium slag powder produced in production example 2.
Example 6
This example differs from example 4 in that in this example, in step S2, 1.2kg of beta-cyclodextrin was added together with the aqueous silica sol, the aqueous blocked isocyanate crosslinker and the catalyst.
Example 7
This example differs from example 4 in that in this example, in step S2, 1.8kg of beta-cyclodextrin was added together with the aqueous silica sol, the aqueous blocked isocyanate crosslinker and the catalyst.
Example 8
The difference between this example and example 3 is that the particle size of the aqueous silica sol in this example is 60 to 90nm and the solid content is 15%.
Comparative example
Comparative example 1
The difference between this comparative example and example 3 is that this comparative example replaces lithium slag powder with an equivalent amount of fly ash.
Comparative example 2
The comparative example differs from example 3 in that the comparative example replaces lithium slag powder with an equal amount of mineral powder.
Comparative example 3
The present comparative example differs from example 3 in that the present comparative example is not provided with the step S2, and in the step S3, the rubber particle premix is replaced with the lithium slag powder and the surface-treated rubber particles.
Comparative example 4
The difference between this comparative example and example 3 is that the aqueous blocked isocyanate crosslinker and catalyst are not added in step S2 of this comparative example.
Comparative example 5
The difference between this comparative example and example 3 is that no lithium slag powder was added in step S2 of this comparative example, and the lithium slag powder was mixed with the rubber particle premix, the mineral powder, the machine-made sand and the crushed stone in step S3 instead.
Comparative example 6
The present comparative example differs from example 3 in that the present comparative example is not provided with the step S1, i.e., the rubber particles are not subjected to surface treatment.
Comparative example 7
The difference between this comparative example and example 3 is that this comparative example replaces the rubber particles with an equal amount of machine-made sand and that no step S2 is provided, in which step S3 the rubber particle premix is replaced with lithium slag powder.
Performance test of rubber lithium slag powder concrete for each example and comparative example
According to GB/T50081-2002 Standard of test method for mechanical Properties of ordinary concrete, the rubber lithium slag powder concrete is cured for 28 days, and the compressive strength is tested, and the results are shown in Table 1.
The tensile strain test was performed after curing the rubber lithium slag powder concrete for 28 days according to SL352-2006, hydraulic concrete test procedure, and the results are shown in Table 1.
According to the quick freezing method of GB/T50082-2009 Standard for test method of Long-term Properties and durability of common concrete, the anti-freezing performance of rubber lithium slag powder concrete is tested after the concrete is cured for 28 days, and the results are shown in Table 1.
According to the step-by-step pressurizing method of GB/T50082-2009 Standard for test method of the long-term Performance and durability of common concrete, the rubber lithium slag powder concrete is cured for 28 days, and the water penetration resistance test is carried out, and the results are shown in Table 1.
TABLE 1
| Compressive strength (MPa) | Tensile Strain (%) | Antifreeze rating | Impervious rating | |
| Example 1 | 35.3 | 3.54 | F200 | P8 |
| Example 2 | 34.8 | 3.68 | F200 | P8 |
| Example 3 | 36.6 | 3.63 | F200 | P8 |
| Example 4 | 37.4 | 3.56 | F200 | P8 |
| Example 5 | 37.8 | 3.53 | F200 | P8 |
| Example 6 | 38.2 | 3.72 | F250 | P8 |
| Example 7 | 38.5 | 3.74 | F250 | P8 |
| Example 8 | 37.4 | 3.80 | F200 | P8 |
| Comparative example 1 | 28.4 | 3.17 | F150 | P6 |
| Comparative example 2 | 31.5 | 3.85 | F200 | P6 |
| Comparative example 3 | 30.7 | 3.92 | F200 | P4 |
| Comparative example 4 | 31.3 | 3.35 | F150 | P6 |
| Comparative example 5 | 32.0 | 3.88 | F200 | P6 |
| Comparative example 6 | 31.8 | 3.69 | F200 | P6 |
| Comparative example 7 | 40.3 | 1.57 | F150 | P4 |
In combination with the analysis of the test results in table 1, in example 3, in which lithium slag powder is used as one of the mineral admixtures in example 3 and comparative examples 1 to 2, the obtained concrete exhibits significantly better compressive strength, and has no significant decrease in tensile strain, i.e., good ductility, and improved permeation resistance, i.e., better overall properties of the concrete, by combining lithium slag powder with rubber particles, aqueous silica sol, and aqueous blocked isocyanate crosslinking agent.
Example 3 in comparison with comparative examples 3-4, it can be seen that the concrete achieves both good compressive strength and ductility when the aqueous silica sol is used in combination with the aqueous blocked isocyanate crosslinker; example 3 compares with comparative examples 5-6, and it can be seen that the rubber particles are tightly combined with the lithium slag powder to exert their respective effects better.
Compared with examples 4-5, the surface modification of the lithium slag powder is helpful for further combination of rubber particles and the lithium slag powder, so that the compressive strength of the lithium slag powder on concrete is improved.
Example 4 in comparison with examples 6-7, it can be seen that the addition of beta-cyclodextrin as a raw material for the premix of rubber particles can improve the ductility of concrete and obtain higher frost resistance.
Compared with the example 8, the particle size of the aqueous silica sol is selected to be 60-90 nm, the solid content is 12-15%, the compressive strength and the ductility of the concrete can be improved at the same time, and the comprehensive performance is better.
The present embodiment is merely illustrative of the present application and is not limiting of the present application, and those skilled in the art, after having read the present specification, may make modifications to the present embodiment without creative contribution as necessary, but are protected by patent laws within the scope of the claims of the present application.
Claims (9)
1. The rubber lithium slag powder concrete is characterized in that: the material comprises the following raw materials in parts by weight:
20-30 parts of cement;
5-6.5 parts of lithium slag powder;
4.5-6 parts of mineral powder;
12-16 parts of rubber particles;
6.5-7.6 parts of aqueous silica sol;
4.8-5.6 parts of water-based blocked isocyanate crosslinking agent;
0.02-0.05 parts of a catalyst;
78-82 parts of machine-made sand;
85-90 parts of crushed stone;
0.6-0.8 part of water reducer;
15-20 parts of water.
2. The rubber lithium slag powder concrete according to claim 1, wherein: the lithium slag powder is modified lithium slag powder, and the preparation raw materials of the modified lithium slag powder comprise (0.08-0.12): (0.8-1.5) by weight of lithium slag powder, gamma-mercaptopropyl trimethoxysilane and a solvent.
3. The rubber lithium slag powder concrete according to claim 1, wherein: the raw materials also comprise 1.2-1.8 parts by weight of beta-cyclodextrin.
4. The rubber lithium slag powder concrete according to claim 1, wherein: the particle size of the aqueous silica sol is 60-90 nm, and the solid content is 12-15%.
5. The rubber lithium slag powder concrete according to claim 1, wherein: the particle size of the rubber particles is 800-900 mu m, and the particle size of the lithium slag powder is 55-60 mu m.
6. A preparation method of rubber lithium slag powder concrete is characterized in that: a process for preparing a rubber lithium slag powder concrete according to any one of claims 1 to 5, comprising the steps of:
s1, adding rubber particles into etching solution, stirring and mixing, filtering, washing with water and drying to obtain rubber particles subjected to surface treatment;
s2, stirring and mixing the rubber particles subjected to surface treatment with lithium slag powder, then adding aqueous silica sol, aqueous closed isocyanate crosslinking agent and catalyst, continuously stirring for 0.3-0.8 h, heating to 90-95 ℃, continuously stirring until the mixture is dried, and obtaining a rubber particle premix;
s3, stirring and mixing the rubber particle premix, the mineral powder, the machine-made sand and the broken stone, then adding cement, continuing to stir and mix, then adding the water reducer and the water, and continuing to stir and mix to prepare the rubber lithium slag powder concrete.
7. The method for preparing rubber lithium slag powder concrete according to claim 6, which is characterized in that: the etching solution is a sulfuric acid solution with the concentration of 40-50wt%.
8. The method for preparing rubber lithium slag powder concrete according to claim 6, which is characterized in that: in the step S2, adding 1.2-1.8 parts by weight of beta-cyclodextrin while adding the aqueous silica sol, the aqueous blocked isocyanate crosslinking agent and the catalyst.
9. The method for preparing rubber lithium slag powder concrete according to claim 6, which is characterized in that: the lithium slag powder is modified lithium slag powder, and the preparation method of the modified lithium slag powder comprises the following steps: mixing lithium slag powder, gamma-mercaptopropyl trimethoxysilane and a solvent according to the weight ratio of (0.08-0.12) to (0.8-1.5) to obtain slurry, ball-milling the slurry at 45-55 ℃, and drying after ball milling to obtain the modified lithium slag powder.
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