CN115710105A - High-strength reinforced concrete and preparation method thereof - Google Patents
High-strength reinforced concrete and preparation method thereof Download PDFInfo
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- CN115710105A CN115710105A CN202211401221.0A CN202211401221A CN115710105A CN 115710105 A CN115710105 A CN 115710105A CN 202211401221 A CN202211401221 A CN 202211401221A CN 115710105 A CN115710105 A CN 115710105A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 57
- 239000011150 reinforced concrete Substances 0.000 title claims abstract description 35
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- 239000002131 composite material Substances 0.000 claims abstract description 58
- 239000011248 coating agent Substances 0.000 claims abstract description 56
- 238000000576 coating method Methods 0.000 claims abstract description 56
- 239000004567 concrete Substances 0.000 claims abstract description 56
- 239000003822 epoxy resin Substances 0.000 claims abstract description 52
- 229920000647 polyepoxide Polymers 0.000 claims abstract description 52
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 49
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 48
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical class [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims abstract description 45
- 239000000843 powder Substances 0.000 claims abstract description 38
- 239000002699 waste material Substances 0.000 claims abstract description 38
- 238000002156 mixing Methods 0.000 claims abstract description 27
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 24
- 239000005543 nano-size silicon particle Substances 0.000 claims abstract description 23
- 239000004568 cement Substances 0.000 claims abstract description 22
- 239000007788 liquid Substances 0.000 claims abstract description 22
- 235000012239 silicon dioxide Nutrition 0.000 claims abstract description 22
- 239000010881 fly ash Substances 0.000 claims abstract description 17
- 239000004576 sand Substances 0.000 claims abstract description 15
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 12
- 239000011707 mineral Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 11
- 239000000654 additive Substances 0.000 claims abstract description 8
- 230000000996 additive effect Effects 0.000 claims abstract description 8
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 222
- 229910052613 tourmaline Inorganic materials 0.000 claims description 25
- 229940070527 tourmaline Drugs 0.000 claims description 25
- 239000011032 tourmaline Substances 0.000 claims description 25
- 238000003756 stirring Methods 0.000 claims description 20
- 239000002114 nanocomposite Substances 0.000 claims description 18
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 11
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 11
- 239000003638 chemical reducing agent Substances 0.000 claims description 11
- 230000032683 aging Effects 0.000 claims description 10
- 238000009210 therapy by ultrasound Methods 0.000 claims description 8
- 239000002253 acid Substances 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 6
- 239000011449 brick Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 6
- 239000011343 solid material Substances 0.000 claims description 6
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 claims description 5
- 229910052744 lithium Inorganic materials 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- 239000000203 mixture Substances 0.000 claims description 4
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims description 3
- 239000007822 coupling agent Substances 0.000 claims description 3
- 239000011777 magnesium Substances 0.000 claims description 3
- 229910052749 magnesium Inorganic materials 0.000 claims description 3
- LXXKJGXDEZDJOM-UHFFFAOYSA-N [Fe].[Mg].[Ca] Chemical compound [Fe].[Mg].[Ca] LXXKJGXDEZDJOM-UHFFFAOYSA-N 0.000 claims description 2
- 230000003213 activating effect Effects 0.000 claims description 2
- USOPFYZPGZGBEB-UHFFFAOYSA-N calcium lithium Chemical compound [Li].[Ca] USOPFYZPGZGBEB-UHFFFAOYSA-N 0.000 claims description 2
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 239000011148 porous material Substances 0.000 abstract description 11
- 239000004566 building material Substances 0.000 abstract description 2
- 235000019441 ethanol Nutrition 0.000 description 65
- 230000000052 comparative effect Effects 0.000 description 21
- 238000012360 testing method Methods 0.000 description 16
- 239000002245 particle Substances 0.000 description 14
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- 150000001875 compounds Chemical class 0.000 description 6
- 239000000377 silicon dioxide Substances 0.000 description 6
- 230000009471 action Effects 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 229920005646 polycarboxylate Polymers 0.000 description 5
- 238000004321 preservation Methods 0.000 description 5
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 4
- 239000013543 active substance Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000008929 regeneration Effects 0.000 description 4
- 238000011069 regeneration method Methods 0.000 description 4
- 239000000523 sample Substances 0.000 description 4
- 239000013078 crystal Substances 0.000 description 3
- 238000002425 crystallisation Methods 0.000 description 3
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- 238000011049 filling Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 230000002195 synergetic effect Effects 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 239000000378 calcium silicate Substances 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 description 2
- VISWVBAMPYJLCJ-UHFFFAOYSA-L calcium;ethanol;carbonate Chemical compound [Ca+2].CCO.[O-]C([O-])=O VISWVBAMPYJLCJ-UHFFFAOYSA-L 0.000 description 2
- 239000000084 colloidal system Substances 0.000 description 2
- 239000013068 control sample Substances 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
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- 239000002244 precipitate Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 229910000029 sodium carbonate Inorganic materials 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 241000282414 Homo sapiens Species 0.000 description 1
- 229910008051 Si-OH Inorganic materials 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 229910006358 Si—OH Inorganic materials 0.000 description 1
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 1
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000000903 blocking 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
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 238000005260 corrosion Methods 0.000 description 1
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- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 125000001165 hydrophobic group Chemical group 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 230000005616 pyroelectricity Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
- 230000001568 sexual effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000008247 solid mixture Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000008030 superplasticizer Substances 0.000 description 1
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 1
- 238000001291 vacuum drying Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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)
Abstract
The application relates to the technical field of building materials, in particular to high-strength reinforced concrete and a preparation method thereof, wherein the high-strength reinforced concrete is prepared from the following raw materials in parts by weight: 90-100 parts of modified recycled coarse aggregate, 70-80 parts of sand, 20-30 parts of cement, 10-20 parts of fly ash, 5-10 parts of mineral powder, 1-3 parts of additive and 15-20 parts of water; the modified recycled coarse aggregate is obtained by coating and modifying waste coarse aggregate with composite gel liquid; the composite gel coating liquid is prepared from the following raw materials in parts by weight: 25-30 parts of nano silicon dioxide, 10-15 parts of nano calcium carbonate, 35-45 parts of epoxy resin and 15-25 parts of modified titanium nitride. The regenerated coarse aggregate is coated by the composite gel coating solution, so that the compactness of the regenerated coarse aggregate is improved, and capillary pores and micro cracks of the regenerated coarse aggregate are filled, so that the edges and corners of the regenerated coarse aggregate are reduced, the roundness is increased, the mixing performance and the compactness of concrete are improved, and the strength of the concrete is further improved.
Description
Technical Field
The application relates to the technical field of building materials, in particular to high-strength reinforced concrete and a preparation method thereof.
Background
The concrete is produced by using cement, sand and stone as raw materials and adding water reducing agent or adding mixture of fly ash, mineral powder, silica powder and the like at the same time through a conventional process. With the continuous expansion of urban scale in China, a large number of existing buildings are dismantled, and the amount of the building waste generated by the dismantling is huge, so that the recycling of the waste building waste is not only the requirement of the times, but also has important significance for protecting the environment, saving resources and developing ecological buildings.
In the raw materials of concrete, the aggregate amount occupies the first place. The waste concrete building waste is used as recycled coarse aggregate to be developed and applied to the high-strength reinforced concrete, so that the problems that a large amount of waste concrete is difficult to treat and the ecological environment is gradually deteriorated due to the difficulty in treating the waste concrete can be solved; but also can reduce the consumption of the construction industry on the gravels, thereby reducing the exploitation on the natural gravels, fundamentally solving the problems of increasing scarcity of the gravels and the destruction of a large amount of gravels to the ecological environment, and protecting the living environment of human beings. However, the recycled coarse aggregate has a rough surface and a large porosity compared to the natural aggregate, and when the recycled coarse aggregate is applied to concrete, the strength of the concrete after solidification is low.
Therefore, the reduction of the porosity of the recycled coarse aggregate is of great significance for the high-strength reinforced concrete formed by the recycled coarse aggregate.
Disclosure of Invention
In order to improve the strength of high-strength reinforced concrete prepared from recycled coarse aggregate, the application provides the high-strength reinforced concrete and a preparation method thereof.
In a first aspect, the present application provides a high-strength reinforced concrete, which adopts the following technical scheme:
a high-strength reinforced concrete comprises the following raw materials in parts by weight: 90-100 parts of modified recycled coarse aggregate, 70-80 parts of sand, 20-30 parts of cement, 10-20 parts of fly ash, 5-10 parts of mineral powder, 1-3 parts of additive and 15-20 parts of water; the modified recycled coarse aggregate is obtained by coating and modifying waste coarse aggregate with a composite gel liquid; the composite gel coating liquid is prepared from the following raw materials in parts by weight: 25-30 parts of nano silicon dioxide, 10-15 parts of nano calcium carbonate, 35-45 parts of epoxy resin and 15-25 parts of modified titanium nitride.
By adopting the technical scheme, the nano silicon dioxide has fine particles, not only can fill the inside of the recycled coarse aggregate and reduce the width of cracks and the size and the number of pores, but also can obtain more stable and more fluid slurry; the nano silicon dioxide is added into a cement system to react with cement hydration products quickly to generate a cement hydrate C-S-H colloid structure with similar high silicon content, and the quickly generated C-S-H colloid structure not only can bond cement and aggregate, but also can restrain excessive free water in the cement, so that the rheological property and the stability of the concrete are improved.
Secondly, the nano silicon dioxide and the nano calcium carbonate can well play a crystallization effect and a small-size effect, the hydration and carbonation capacity of the recycled aggregate can be enhanced, the recycled aggregate has good osmotic crystallization performance after being mixed with water, can quickly permeate into cracks and pores of the recycled aggregate and crystallize to generate hydrated calcium silicate gel, can also quickly generate calcium carbonate precipitate to fill the cracks and the pores, improve the mechanical property and the impermeability of the recycled aggregate, and has a good crack repairing function.
Moreover, the titanium nitride in the application has small particle size, can be dispersed in epoxy resin, nano silicon dioxide and nano calcium carbonate, reduces the overall size of the composite gel coating liquid, has better coating effect on the regenerated coarse aggregate, improves the compactness of the regenerated coarse aggregate, fills capillary pores and microscopic cracks of the regenerated coarse aggregate, reduces the edge angle of the regenerated coarse aggregate, increases the roundness, improves the mixing performance and the compactness of concrete, and further improves the strength of the concrete.
In conclusion, the formula is reasonable, and the strength of the high-strength reinforced concrete prepared from the recycled aggregate is improved under the mutual matching effect of the components.
Preferably, the waste coarse aggregate is at least one of waste baked bricks and waste concrete.
By adopting the technical scheme, the urban construction waste mainly comprises the waste baked bricks and the waste concrete, and the waste baked bricks and the waste concrete are reused, so that the reasonable utilization of resources is realized, the problems of resource waste and environmental pollution caused by landfill and stacking of the construction waste are solved, and powerful technical support is provided for the effective utilization of the construction waste.
Preferably, the modified titanium nitride is prepared by grafting and modifying titanium nitride through a coupling agent; the preparation method of the modified titanium nitride comprises the following steps: dissolving a silane coupling agent KH550 in absolute ethanol to prepare a KH550 ethanol solution with the mass concentration of 3-5%; mixing titanium nitride and the KH550 ethanol solution according to the ratio of 2: (1-3), stirring for 3-5h in water bath at 55-65 ℃, cooling and drying in vacuum to obtain the product.
By adopting the technical scheme, because the titanium nitride has small particles, is easy to agglomerate and can not be uniformly dispersed in the composite gel liquid, the coupling agent is grafted on the surface of the titanium nitride to strengthen the interface effect, strengthen the compatibility of the titanium nitride and the epoxy resin and increase the dispersibility of the titanium nitride and the epoxy resin, so that the titanium nitride can effectively fill the pores of the regenerated coarse aggregate, the hardness of the regenerated coarse aggregate is improved, and the compactness and the mechanical strength of the high-strength reinforced concrete are improved.
Preferably, the preparation method of the composite gel coating solution comprises the following steps: mixing the nano silicon dioxide and the nano calcium carbonate with ethanol to prepare a nano composite ethanol solution with the mass concentration of 35-40%; mixing epoxy resin with ethanol to prepare epoxy resin ethanol solution with the mass concentration of 35-40%; mixing the nano mixture ethanol solution and the epoxy resin ethanol solution according to the ratio of 2: (1-5), adding an ammonia water ethanol solution, fully shaking and carrying out ultrasonic treatment for 3-5min, adding modified titanium nitride under stirring in a water bath at 60-70 ℃, keeping the water bath temperature and aging for 25-30h to obtain the titanium nitride.
By adopting the technical scheme, under the action of the ammonia water ethanol solution, the nano compound ethanol solution and the epoxy resin ethanol solution are polymerized with the epoxy resin and are connected to the surface of the epoxy resin in a strong interaction manner, and the titanium nitride enters the pores of the regenerated coarse aggregate under the action of the compound gel to fill the regenerated coarse aggregate, so that the compactness of the regenerated coarse aggregate is improved, and the compressive strength, impermeability and heat resistance of concrete are improved; the epoxy resin which is not compounded with the nano-composite is hydrophilic, the hydrophobicity of the epoxy resin is improved along with the addition of the nano-silicon composite, the epoxy resin can be protected due to the fact that the nano-composite contains a certain hydrophobic group, a water blocking barrier is formed on the regenerated coarse aggregate, and the anti-permeability performance of the concrete is improved; meanwhile, the relative dosage of the epoxy resin and the nano compound is proper, so that the formed gel framework has poor strength and an incomplete gel structure when the dosage of the epoxy resin is small, the regenerated coarse aggregate cannot be coated, and the phenomenon that the composite gel framework has serious shrinkage, increases the mass concentration, increases the roughness of the surface of the epoxy resin framework and reduces the impermeability due to the fact that more Si-OH bonds are generated during drying and further reaction occurs when the dosage of the nano compound is large can be prevented.
Preferably, the preparation method of the modified recycled coarse aggregate comprises the following steps: crushing the waste coarse aggregate, and mixing the crushed waste coarse aggregate with a composite gel coating solution according to a mass ratio of 1: (1-3), stirring for 2-3h in a water bath at 60-70 ℃, cooling and drying in vacuum.
By adopting the technical scheme, when the waste coarse aggregate is relatively more, the composite gel coating liquid has poor coating property on the waste coarse aggregate; when the amount of the composite gel coating liquid is relatively large, the residual composite gel liquid for coating the waste coarse aggregate causes resource waste.
Preferably, the admixture comprises 0.5-1 part by mass of polycarboxylic acid water reducing agent and 0.5-2 parts by mass of tourmaline powder activating agent.
By adopting the technical scheme, the polycarboxylate superplasticizer has hydroxyl and ether (-C-O-C) in the mass and has hydrophilicity, the groups are combined with water molecules through hydrogen bonds to form a water film on the surfaces of cement particles, the water film has good lubricating effect and can effectively reduce the resistance among the cement particles and increase the fluidity of concrete, but the particle size of the cement particles is in a micron level, and the polycarboxylate molecules are in a nanometer level.
Tourmaline powder has pyroelectricity, and at a certain temperature, charged particles in crystals generate relative displacement, positive and negative charge centers are separated, and the total electric moment of the crystals is changed, so that polarization charges are generated, the generation of the polarization charges can reduce the combination of carboxyl end groups of the polycarboxylate water reducer and calcium ions in cement to a certain extent, and promote calcium hydroxide to form crystals, so that the early strength performance is improved.
In conclusion, a proper amount of polycarboxylic acid water reducing agent and tourmaline powder active agent are added into the high-strength reinforced concrete simultaneously, and the polycarboxylic acid water reducing agent and the tourmaline powder active agent have synergistic effect, so that the fluidity and the early strength of the concrete are improved.
Preferably, the tourmaline powder is one of lithium tourmaline powder, magnesium tourmaline powder, iron tourmaline powder, calcium magnesium tourmaline powder, calcium lithium tourmaline powder or iron calcium magnesium tourmaline powder; more preferably, the magnesium tourmaline powder.
Preferably, the fly ash is I-grade fly ash, the ignition loss is less than or equal to 3 percent, the 45-micron screen residue is less than or equal to 10 percent, the water demand ratio is less than or equal to 95 percent, and the water content is less than or equal to 1 percent.
Preferably, the fineness modulus of the sand is 2.3-2.7, and the apparent density is 2600-2650Kg/m 3 The bulk density is 1500-1560Kg/m 3 。
By adopting the technical scheme, the grade I fly ash has small fineness and can be filled among aggregate particles, the compactness of concrete is improved, bleeding and segregation of the concrete are reduced, and the fluidity and the filling property are improved; the sand is proper in thickness, good in mixing performance and construction workability, and can be fully filled among modified recycled coarse aggregates, so that the compactness of the concrete is improved, and the workability of the concrete is improved.
In a second aspect, the present application provides a method for preparing a high-strength reinforced concrete, which adopts the following technical scheme: a preparation method of high-strength reinforced concrete comprises the following steps: and uniformly stirring the modified recycled coarse aggregate, the sand, the cement, the fly ash and the mineral powder to prepare a mixed solid material, adding the additive into water, uniformly stirring, adding into the mixed solid material, and uniformly mixing.
By adopting the technical scheme, the modified recycled coarse aggregate, the sand, the cement, the fly ash and the mineral powder are mixed firstly, so that the modified recycled coarse aggregate, the sand, the cement, the fly ash and the mineral powder are mixed uniformly, and then the additive is dissolved by water and added into a solid mixture, so that the viscosity of concrete can be improved, the fluidity and the filling property of the concrete can be improved, and the preparation method is efficient and convenient.
In summary, the present application includes at least one of the following beneficial technical effects:
1. according to the method, the recycled coarse aggregate is treated by the composite gel coating solution, and capillary holes and micro cracks of the recycled coarse aggregate are filled, so that edges and corners of the recycled coarse aggregate are reduced, the roundness is increased, the compactness of the recycled coarse aggregate is improved, the compactness and the mixing property of concrete are improved, and the strength of the concrete is further improved;
2. when the composite gel coating solution is prepared, the nanometer compound ethanol solution and the epoxy resin ethanol solution are adopted under the action of the ammonia water ethanol solution, so that the nanometer compound is connected to the surface of the epoxy resin with a strong acting force to form the composite gel, and meanwhile, the titanium oxide is accumulated in the pores of the regenerated coarse aggregate under the action of the composite gel to fill the regenerated coarse aggregate, so that the compactness of the regenerated coarse aggregate is further improved;
3. the additive is a polycarboxylate water reducer and an tourmaline powder active agent, and the fluidity and the early strength of the high-strength enhanced concrete are improved through the synergistic effect of the polycarboxylate water reducer and the tourmaline powder active agent.
Detailed Description
The present application is described in further detail below with reference to preparation examples and examples.
Preparation examples
Preparation example 1
The preparation example of the application discloses a composite gel coating solution which is prepared from 25g of nano silicon dioxide, 10g of nano calcium carbonate, 35g of epoxy resin and 15g of modified titanium nitride. Wherein the average particle size of the nano silicon dioxide is 20nm, and the nano silicon dioxide is purchased from Nanjing Baoke new material Co., ltd; the average mesh number of the nano calcium carbonate is 1250 meshes, and the nano calcium carbonate is purchased from Jinxin powder technology Co., ltd, dongguan city; epoxy resin was purchased from galleries Bohai star corrosion protection equipment Co.
The preparation example of the application also discloses a preparation method of the composite coating liquid, which comprises the following steps: the method comprises the following steps:
s10, dissolving 3g of a silane coupling agent KH550 in 97g of absolute ethanol to prepare a KH550 ethanol solution with the mass concentration of 3%; mixing 100g of titanium nitride with 50g of KH550 ethanol solution, stirring in water bath at 55 ℃ for 5h, cooling, and vacuum-drying to obtain modified titanium nitride; wherein the silane coupling agent KH550 is obtained from Shandong Hengyuxin materials Co., ltd; titanium nitride, CAS:25583-20-4;
s20, dissolving 25g of nano silicon dioxide and 10g of nano calcium carbonate in 65g of absolute ethanol, and mixing to prepare a nano composite ethanol solution with the mass concentration of 35%; dissolving 35g of epoxy resin in 65g of absolute ethanol to prepare an epoxy resin ethanol solution with the mass concentration of 35%; mixing 20g of the ethanol solution of the nano-composite with 10g of the ethanol solution of the epoxy resin, adding 55g of the ethanol solution of ammonia water, fully shaking and performing ultrasonic treatment for 3min, adding 15g of the modified titanium nitride under stirring in a water bath at 70 ℃, preserving heat and aging for 25h to obtain the composite gel coating liquid.
Preparation example 2
The preparation example is substantially the same as preparation example 1, except that in S10, 4g of the silane coupling agent KH550 is dissolved in 96g of absolute ethanol to prepare a KH550 ethanol solution with a mass concentration of 4%; 100g of titanium nitride was mixed with 100g of KH550 ethanol solution.
Preparation example 3
The preparation example is substantially the same as preparation example 1, except that in S10, 5g of the silane coupling agent KH550 is dissolved in 95g of absolute ethanol to prepare a KH550 ethanol solution with a mass concentration of 5%; 100g of titanium nitride was mixed with 150g of KH550 ethanol solution.
Preparation example 4
The preparation example is basically the same as the preparation example 1, except that in S20, 27.5g of nano silica and 12.5g of nano calcium carbonate are dissolved in 60g of absolute ethanol and mixed to prepare a nano composite ethanol solution with the mass concentration of 40%; dissolving 40g of epoxy resin in 60g of absolute ethyl alcohol to prepare an epoxy resin ethanol solution with the mass concentration of 40%; mixing 20g of the ethanol solution of the nano-composite with 30g of the ethanol solution of the epoxy resin, adding 70g of the ethanol solution of ammonia water, fully shaking and carrying out ultrasonic treatment for 3min, adding 20g of modified titanium nitride under stirring of a water bath at 70 ℃, and then carrying out heat preservation and aging for 25h to obtain the composite gel coating solution.
Preparation example 5
The preparation example is basically the same as the preparation example 1, except that in S20, 30g of nano silica and 15g of nano calcium carbonate are dissolved in 55g of absolute ethanol and mixed to prepare a nano composite ethanol solution with the mass concentration of 45%; dissolving 45g of epoxy resin in 55g of absolute ethyl alcohol to prepare an epoxy resin ethanol solution with the mass concentration of 45%; mixing 20g of the ethanol solution of the nano-composite with 50g of the ethanol solution of the epoxy resin, adding 100g of the ethanol solution of ammonia water, fully shaking and carrying out ultrasonic treatment for 3min, adding 25g of modified titanium nitride under stirring of a water bath at 70 ℃, and then carrying out heat preservation and aging for 25h to obtain the composite gel coating solution.
Preparation example 6
This production example is substantially the same as production example 1 except that, in S20, 20g of the nanocomposite ethanol solution was mixed with 30g of the epoxy resin ethanol solution.
Preparation example 7
This production example is substantially the same as production example 1 except that, in S20, 20g of the nanocomposite ethanol solution was mixed with 50g of the epoxy resin ethanol solution.
Preparation example 8
The preparation example is basically the same as the preparation example 1, except that in S10, titanium nitride is mixed with KH550 ethanol solution, stirred in water bath at 65 ℃ for 3h, cooled and dried in vacuum to obtain modified titanium nitride; and S20, mixing the ethanol solution of the nano-composite ethanol solution and the ethanol solution of the epoxy resin, adding the ethanol solution of ammonia water, fully oscillating and ultrasonically treating for 5min, adding the modified titanium nitride while stirring in a water bath at the temperature of 60 ℃, and then preserving heat and aging for 30h to obtain the composite gel coating solution.
Preparation example 9
The preparation example is basically the same as the preparation example 1, except that S20, 42.5g of nano silica and 17g of nano calcium carbonate are dissolved in 110.5g of absolute ethanol and mixed to prepare a nano composite ethanol solution with the mass concentration of 35%; adding 25.5g of modified titanium nitride, preserving heat and aging for 25h to obtain the composite gel coating liquid.
Preparation example 10
The preparation example is basically the same as the preparation example 1, except that S20,35g of nano silicon dioxide is dissolved in 65g of absolute ethyl alcohol and mixed to prepare a nano silicon dioxide ethyl alcohol solution with the mass concentration of 35%; dissolving 35g of epoxy resin in 65g of absolute ethanol to prepare an epoxy resin ethanol solution with the mass concentration of 35%; mixing 20g of nano-silica ethanol solution and 10g of epoxy resin ethanol solution, adding 55g of ammonia water ethanol solution, fully shaking and carrying out ultrasonic treatment for 3min, adding 15g of modified titanium nitride under stirring of water bath at 70 ℃, and then carrying out heat preservation and aging for 25h to obtain the composite gel coating solution.
Preparation example 11
The preparation example is basically the same as the preparation example 1, except that S20,35g of nano calcium carbonate is dissolved in 65g of absolute ethanol and mixed to prepare a nano calcium carbonate ethanol solution with the mass concentration of 35%; dissolving 35g of epoxy resin in 65g of absolute ethyl alcohol to prepare an epoxy resin ethyl alcohol solution with the mass concentration of 35%; mixing 20g of nano calcium carbonate ethanol solution with 10g of epoxy resin ethanol solution, adding 55g of ammonia water ethanol solution, fully shaking and carrying out ultrasonic treatment for 3min, adding 15g of modified titanium nitride under stirring of water bath at 70 ℃, and then carrying out heat preservation and aging for 25h to obtain the composite gel coating solution.
Preparation example 12
This preparation example is substantially the same as preparation example 1, except that S10 is omitted, and S20, 32.5g of nano silica and 13g of nano calcium carbonate are dissolved in 84.5g of absolute ethanol and mixed to prepare a nano composite ethanol solution with a mass concentration of 35%; dissolving 35g of epoxy resin in 65g of absolute ethyl alcohol to prepare an epoxy resin ethyl alcohol solution with the mass concentration of 35%; and mixing 20g of the ethanol solution of the nano-composite with 10g of the ethanol solution of the epoxy resin, adding 55g of the ethanol solution of ammonia water, fully shaking and carrying out ultrasonic treatment for 3min, and carrying out heat preservation and aging at 70 ℃ for 25h to obtain the composite gel coating solution.
Examples
Examples 1 to 13
As shown in Table 1, the differences between the preparation examples 1 to 13 are that the raw material ratios of the high-strength reinforced concrete are different.
The following description will be given by taking example 1 as an example. The embodiment of the application discloses high-strength reinforced concrete to improve90Kg of sexual regeneration coarse aggregate, 70Kg of sand, 20Kg of cement, 10Kg of fly ash, 5Kg of mineral powder, 0.5Kg of polycarboxylic acid water reducing agent, 0.5Kg of lithium tourmaline powder and 15Kg of water are taken as raw materials to prepare the material. Wherein the sand has fineness of 2.3 and apparent density of 2600Kg/m 3 The bulk density is 1500Kg/m 3 In other embodiments, the sand may have a fineness of 2.7 and an apparent density of 2650Kg/m 3 The bulk density is 1560Kg/m 3 (ii) a The cement is P.0425.5; the fly ash is I-grade fly ash, the ignition loss is less than or equal to 3 percent, the 45 mu m screen residue is less than or equal to 10 percent, the water demand ratio is less than or equal to 95 percent, and the water content is less than or equal to 1 percent; the mineral powder is S95 grade, and the specific surface area is 400m 2 Perkg, 28d activity index 95%, fluidity ratio 95%; the model of the polycarboxylic acid water reducing agent is as follows: 540P, purchased from Chongqing Haizu chemical products, inc.; the lithium tourmaline powder has a mesh number of 1250 meshes and is purchased from Shijiazhuantouma mineral products Co.
TABLE 1 EXAMPLES 1-13 proportions of raw materials for strength-reinforced concrete
The embodiment of the application also discloses a preparation method of the high-strength reinforced concrete, which specifically comprises the following steps:
s1, preparing modified recycled coarse aggregate:
s11, subjecting the waste concrete test block to primary crushing treatment, screening to obtain a regenerated block with the particle size of 50-80mm, and then placing the regenerated block at the temperature of 300 ℃ for baking for 1.5 hours; cooling the baked regeneration block by cold air, carrying out secondary crushing treatment when the temperature of the regeneration block is reduced to 50 ℃, and screening to obtain regeneration aggregate with the particle size of 5-20 mm; in the embodiment, the recycled coarse aggregate is waste concrete, and in other embodiments, waste baked bricks or a mixture of waste concrete and waste baked bricks can be selected;
s12, mixing 50Kg of treated recycled aggregate with 50Kg of composite gel coating solution, stirring for 3h in water bath at 60 ℃, cooling and then drying in vacuum to prepare modified recycled coarse aggregate; wherein the composite gel coating solution is obtained by adopting preparation example 1;
s2, weighing the modified recycled coarse aggregate, the sand, the cement, the fly ash and the mineral powder according to the formula, uniformly stirring to prepare a mixed solid material, adding the polycarboxylic acid water reducing agent and the lithium tourmaline powder into water, uniformly stirring, adding into the mixed solid material, and uniformly mixing to prepare the high-strength reinforced concrete.
Examples 14 to 20
The examples 14 to 19 are substantially the same as the example 1, except that in S12, the preparation method of the composite gel coating solution is different, and the specific correspondence is shown in table 2.
TABLE 2 preparation of composite gel coating solutions used in examples 14-19
Example 21
This example is substantially the same as example 1 except that 50Kg of the treated recycled aggregate was mixed with 100Kg of the composite gel coating solution S12.
Example 22
This example is substantially the same as example 1 except that, S12, 50Kg of treated recycled aggregate was mixed with 150Kg of composite gel-coating solution.
Example 23
This example is substantially the same as example 1 except that, S12, the treated recycled aggregate and the composite gel coating solution were mixed, stirred in a water bath at 70 ℃ for 2 hours, cooled and then vacuum-dried to prepare a modified recycled coarse aggregate.
Comparative example
Comparative example 1
The comparative example is different from example 1 in that the modified recycled coarse aggregate was replaced with waste concrete having a particle size of 5 to 20mm after pulverization in equal amount.
Comparative example 2
The comparative example is different from example 1 in that, in S12, the composite gel coating solution obtained in preparation example 9 was used.
Comparative example 3
The comparative example is different from example 1 in that, in S12, the composite gel coating solution obtained in preparation example 10 was used.
Comparative example 4
The comparative example is different from comparative example 1 in that, in S12, the composite gel coating solution obtained in preparation example 11 was used.
Comparative example 5
The comparative example is different from comparative example 1 in that in S12, the composite gel coating solution obtained in preparation example 12 was used.
Performance detection
The same weight of the high-strength reinforced concrete was used as the test samples 1 to 23 obtained in examples 1 to 23, and the same weight of the high-strength reinforced concrete was used as the control samples 1 to 5 obtained in comparative examples 1 to 5. The test sample and the control sample were subjected to performance measurement, and the results are shown in Table 3.
The specific test process is as follows: and respectively loading the high-strength reinforced concrete obtained from the test sample and the control sample into test molds at one time, inserting and tamping the test molds along the walls of the test molds by using a spatula during loading, then placing the test molds on a vibration table, vibrating twice, scraping the redundant high-strength reinforced concrete at the openings of the test molds, then troweling and placing the test molds into a concrete curing box for curing for 24 hours, removing the molds, finally moving the test molds into a standard concrete curing chamber for curing, and taking out the test molds after 28 days for the following tests.
Compressive strength and flexural strength: detecting according to GB/T50107-2010 concrete strength detection and evaluation Standard; splitting strength and bending tensile strength: the test is carried out according to JTG 3420-2020 test Specification for road engineering cement and cement concrete.
TABLE 3 tables of data on the performance tests of examples 1 to 23 and comparative examples 1 to 5
Referring to table 3, combining example 1 with comparative example 1, it can be seen that the strength of concrete prepared from recycled coarse aggregate is improved after the recycled coarse aggregate is modified by the composite gel coating solution. The composite gel coating liquid can fill capillary holes and microcracks generated originally or destroyed later on in the recycled aggregate, increase the roundness of the recycled coarse aggregate, improve the workability and the compactness of the concrete and improve the mechanical strength of the concrete.
Referring to table 3, combining examples with comparative examples 2 to 5, it can be seen that when no epoxy resin is added to prepare a composite gel coating solution, i.e., when an equal amount of epoxy resin is equally spread to other components (comparative example 2), the strength of the prepared concrete is decreased. The epoxy resin is added, so that the nano silicon dioxide, the nano sodium carbonate and the modified titanium nitride can be effectively prevented from agglomerating, and the dispersity of the composite gel coating liquid is improved, so that the coating effect of the composite gel coating liquid on the recycled coarse aggregate is improved, and the strength of the concrete is improved.
When the nano calcium carbonate is not added in the prepared composite gel coating solution, namely the nano calcium carbonate is replaced by the same amount of nano silicon dioxide (comparative example 3) or the nano silicon dioxide is replaced by the same amount of nano calcium carbonate (comparative example 4), the strength of the prepared concrete is not as high as that of the concrete prepared by adding the nano silicon dioxide and the nano calcium carbonate; the nano silicon dioxide and the nano calcium carbonate have small particle size, can effectively fill pores in the recycled coarse aggregate and improve the strength of the recycled coarse aggregate, and simultaneously can well play a crystallization effect when the nano silicon dioxide and the nano calcium carbonate are used simultaneously to generate calcium silicate hydrate gel and calcium carbonate precipitate, fill cracks and pores and improve the mechanical strength of the recycled coarse aggregate.
When the modified titanium nitride was uniformly distributed to the other components without adding the modified titanium nitride to the prepared composite gel-coating liquid (comparative example 5), the strength of the obtained concrete was inferior to that of sample 1. The modified titanium nitride has high hardness, can improve the strength of concrete, has small particle size, can be dispersed in epoxy resin, nano sodium carbonate and nano silicon dioxide after being modified, reduces the overall size of the composite gel coating liquid, enables the composite gel coating liquid to fully enter pores of regenerated coarse aggregates, improves the compactness of the concrete, and further improves the strength.
In conclusion, the components in the composite gel coating liquid are mutually associated and have a synergistic effect, and the strength of the concrete is improved under the combined action of the components.
Referring to Table 3, in combination with examples 1 to 13, it can be seen that the concrete prepared by varying the contents of the respective components in the concrete within appropriate ranges has superior strength.
Referring to table 3, in combination with examples 1, 14 and 15, it can be seen that when modified titanium nitride is prepared, samples having better strength are obtained by varying the concentration of the KH550 ethanol solution while varying the mass ratio of titanium nitride to the KH550 ethanol solution within an appropriate range. However, the best concrete sample was obtained when the concentration of the KH550 ethanol solution was 4% and the mass ratio of titanium nitride to the KH550 ethanol solution was 1.
Referring to table 3, in combination with examples 1, 16 and 17, it can be seen that the concrete obtained by changing the contents of the components of the prepared composite gel coating solution within a proper range has better mechanical strength; in example 16, the contents of the respective components of the composite gel coating solution were the most suitable, the filling effect on the recycled coarse aggregate was the best, and the strength of the obtained concrete was the highest.
Referring to table 3, in combination with examples 1, 18, and 19, it can be seen that, when the composite gel coating solution is prepared, the mass ratio of the nanocomposite to the epoxy resin ethanol solution is changed within an appropriate range, and the obtained composite gel coating solution improves the compactness of the recycled coarse aggregate; meanwhile, when the mass ratio of the nano composite to the epoxy resin ethanol solution is 2.
Referring to table 3, in combination with examples 1, 22 and 22, it can be seen that, when concrete is prepared, the mass ratio of the treated aggregate to the composite gel coating liquid is changed within an appropriate range, and the obtained concrete has a good strength, wherein the strength of the concrete is the highest when the ratio of the two is 1.
The specific embodiments are only for explaining the present application and are not limiting to the present application, and those skilled in the art can make modifications to the embodiments without inventive contribution as required after reading the present specification, but all the embodiments are protected by patent law within the scope of the claims of the present application.
Claims (10)
1. A high strength reinforced concrete characterized in that: the feed is prepared from the following raw materials in parts by weight: 90-100 parts of modified recycled coarse aggregate, 70-80 parts of sand, 20-30 parts of cement, 10-20 parts of fly ash, 5-10 parts of mineral powder, 1-3 parts of additive and 15-20 parts of water; the modified recycled coarse aggregate is obtained by coating and modifying waste coarse aggregate with composite gel liquid; the composite gel coating liquid is prepared from the following raw materials in parts by weight: 25-30 parts of nano silicon dioxide, 10-15 parts of nano calcium carbonate, 35-45 parts of epoxy resin and 15-25 parts of modified titanium nitride.
2. A high strength reinforced concrete according to claim 1, wherein: the waste coarse aggregate is at least one of waste baked bricks and waste concrete.
3. A high strength reinforced concrete according to claim 1, wherein: the modified titanium nitride is prepared by grafting and modifying titanium nitride through a coupling agent; the preparation method of the modified titanium nitride comprises the following steps: dissolving a silane coupling agent KH550 in absolute ethanol to prepare a KH550 ethanol solution with the mass concentration of 3-5%; mixing titanium nitride and the KH550 ethanol solution according to the ratio of 2: (1-3), stirring for 3-5h in water bath at 55-65 ℃, cooling and drying in vacuum to obtain the product.
4. A high strength reinforced concrete according to claim 1, wherein: the preparation method of the composite gel coating solution comprises the following steps: mixing the nano silicon dioxide and the nano calcium carbonate with ethanol to prepare a nano composite ethanol solution with the mass concentration of 35-40%; mixing epoxy resin with ethanol to prepare epoxy resin ethanol solution with the mass concentration of 35-40%; and (3) mixing the nano mixture ethanol solution and the epoxy resin ethanol solution according to the ratio of 2: (1-5), adding an ammonia water ethanol solution, fully shaking and carrying out ultrasonic treatment for 3-5min, adding modified titanium nitride under stirring in a water bath at 60-70 ℃, keeping the water bath temperature and aging for 25-30h to obtain the titanium nitride.
5. The high-strength reinforced concrete according to claim 1, wherein: the preparation method of the modified recycled coarse aggregate comprises the following steps: crushing the waste coarse aggregate, and mixing the crushed waste coarse aggregate with a composite gel coating solution according to a mass ratio of 1: (1-3), stirring for 2-3h in a water bath at 60-70 ℃, cooling and drying in vacuum.
6. A high strength reinforced concrete according to claim 1, wherein: the additive comprises 0.5-1 part by mass of a polycarboxylic acid water reducing agent and 0.5-2 parts by mass of an tourmaline powder activating agent.
7. A high strength reinforced concrete according to claim 6, wherein: the tourmaline powder is one of lithium tourmaline powder, magnesium tourmaline powder, iron tourmaline powder, calcium magnesium tourmaline powder, calcium lithium tourmaline powder or iron calcium magnesium tourmaline powder.
8. A high strength reinforced concrete according to claim 1, wherein: the fly ash is I-grade fly ash, the ignition loss is less than or equal to 3 percent, the 45 mu m screen residue is less than or equal to 10 percent, the water demand ratio is less than or equal to 95 percent, and the water content is less than or equal to 1 percent.
9. A high strength reinforced concrete according to claim 1, wherein: the fineness modulus of the sand is 2.3-2.7, and the apparent density is 2600-2650Kg/m 3 The bulk density is 1500-1560Kg/m 3 。
10. A method of producing a high strength reinforced concrete according to claims 1-9, characterized in that: and uniformly stirring the modified recycled coarse aggregate, the sand, the cement, the fly ash and the mineral powder to prepare a mixed solid material, adding the additive into water, uniformly stirring, adding into the mixed solid material, and uniformly mixing.
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