CN115959873A - High-ductility concrete with high bending toughness and preparation method thereof - Google Patents
High-ductility concrete with high bending toughness and preparation method thereof Download PDFInfo
- Publication number
- CN115959873A CN115959873A CN202310250821.XA CN202310250821A CN115959873A CN 115959873 A CN115959873 A CN 115959873A CN 202310250821 A CN202310250821 A CN 202310250821A CN 115959873 A CN115959873 A CN 115959873A
- Authority
- CN
- China
- Prior art keywords
- parts
- fiber
- concrete
- steel fiber
- water
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000004567 concrete Substances 0.000 title claims abstract description 41
- 238000005452 bending Methods 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000000835 fiber Substances 0.000 claims abstract description 125
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 67
- 239000010959 steel Substances 0.000 claims abstract description 67
- 239000002131 composite material Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000003513 alkali Substances 0.000 claims abstract description 21
- 239000010881 fly ash Substances 0.000 claims abstract description 10
- 239000011398 Portland cement Substances 0.000 claims abstract description 8
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 8
- 239000011707 mineral Substances 0.000 claims abstract description 8
- 239000000843 powder Substances 0.000 claims abstract description 8
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims description 36
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 32
- XHXFXVLFKHQFAL-UHFFFAOYSA-N phosphoryl trichloride Chemical compound ClP(Cl)(Cl)=O XHXFXVLFKHQFAL-UHFFFAOYSA-N 0.000 claims description 28
- ZCCIPPOKBCJFDN-UHFFFAOYSA-N calcium nitrate Chemical compound [Ca+2].[O-][N+]([O-])=O.[O-][N+]([O-])=O ZCCIPPOKBCJFDN-UHFFFAOYSA-N 0.000 claims description 24
- 238000003756 stirring Methods 0.000 claims description 24
- 239000002738 chelating agent Substances 0.000 claims description 23
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims description 18
- 238000001035 drying Methods 0.000 claims description 16
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 16
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 13
- 239000004115 Sodium Silicate Substances 0.000 claims description 12
- 239000011248 coating agent Substances 0.000 claims description 12
- 238000000576 coating method Methods 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 12
- 229910052911 sodium silicate Inorganic materials 0.000 claims description 12
- 238000002390 rotary evaporation Methods 0.000 claims description 10
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 8
- 229910021536 Zeolite Inorganic materials 0.000 claims description 8
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 8
- 239000010440 gypsum Substances 0.000 claims description 8
- 229910052602 gypsum Inorganic materials 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 8
- 229910021487 silica fume Inorganic materials 0.000 claims description 8
- 239000010457 zeolite Substances 0.000 claims description 8
- 239000012065 filter cake Substances 0.000 claims description 7
- 238000012986 modification Methods 0.000 claims description 7
- 230000004048 modification Effects 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 6
- 238000007865 diluting Methods 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 238000007493 shaping process Methods 0.000 claims description 6
- 238000010008 shearing Methods 0.000 claims description 6
- 238000002386 leaching Methods 0.000 claims description 5
- 239000012783 reinforcing fiber Substances 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 9
- 125000005373 siloxane group Chemical group [SiH2](O*)* 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 4
- 239000004566 building material Substances 0.000 abstract description 3
- 239000000378 calcium silicate Substances 0.000 abstract description 3
- 229910052918 calcium silicate Inorganic materials 0.000 abstract description 3
- OYACROKNLOSFPA-UHFFFAOYSA-N calcium;dioxido(oxo)silane Chemical compound [Ca+2].[O-][Si]([O-])=O OYACROKNLOSFPA-UHFFFAOYSA-N 0.000 abstract description 3
- 239000011241 protective layer Substances 0.000 abstract description 3
- 238000005245 sintering Methods 0.000 abstract description 3
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 abstract description 2
- 239000011575 calcium Substances 0.000 abstract description 2
- 229910052791 calcium Inorganic materials 0.000 abstract description 2
- 239000011162 core material Substances 0.000 abstract description 2
- 238000000151 deposition Methods 0.000 abstract description 2
- 239000010703 silicon Substances 0.000 abstract description 2
- 229910052710 silicon Inorganic materials 0.000 abstract description 2
- 230000009920 chelation Effects 0.000 abstract 1
- 238000005536 corrosion prevention Methods 0.000 abstract 1
- 230000036571 hydration Effects 0.000 abstract 1
- 238000006703 hydration reaction Methods 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 description 9
- 238000004321 preservation Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 5
- 238000011068 loading method Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000004080 punching Methods 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 241000196324 Embryophyta Species 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- 230000002968 anti-fracture Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000010954 inorganic particle Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000001132 ultrasonic dispersion Methods 0.000 description 2
- 241001374849 Liparis atlanticus Species 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 125000003277 amino group Chemical group 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- OSMSIOKMMFKNIL-UHFFFAOYSA-N calcium;silicon Chemical compound [Ca]=[Si] OSMSIOKMMFKNIL-UHFFFAOYSA-N 0.000 description 1
- 125000001309 chloro group Chemical group Cl* 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 239000006072 paste Substances 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000012779 reinforcing material Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000010902 straw Substances 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 229920002994 synthetic fiber Polymers 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
Abstract
The invention relates to high-ductility concrete with high bending toughness and a preparation method thereof, belongs to the technical field of building materials, and is mainly applied to the aspect of thin laminated floors. The concrete comprises the following components in parts by weight: 450-480 parts of portland cement, 120-150 parts of mineral powder, 510-540 parts of fine aggregate, 65-80 parts of composite reinforced fiber, 4.2-4.4 parts of water reducing agent and 180-200 parts of water; the composite reinforced fiber takes steel fiber as a core material, siloxane groups are attached to the surface of the steel fiber through chelation, then alkali paste taking fly ash as a main material is coated on the surface of the steel fiber, a porous protective layer containing silicon and calcium is formed through sintering, calcium silicate is loaded in a porous structure through a deposition method, the steel fiber is subjected to corrosion prevention and protection, the bonding strength of the steel fiber and concrete is enhanced through physical embedment and hydration promotion, and the toughening effect of the steel fiber is fully exerted.
Description
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to high-ductility concrete with high bending toughness and a preparation method thereof.
Background
The concrete material has the advantages of convenient aggregate material acquisition, simple production process, low manufacturing cost, excellent mechanical properties such as high compressive strength, good durability, corrosion resistance and the like, is widely applied to constructional engineering, and is one of the main civil engineering materials which are researched most and applied most widely in the world at present. With the rapid development of economy and the further increase of social requirements, the construction of various heavy concrete structures applied under severe conditions is continuously increased, and the existing engineering structures are developed to the aspects of large span, high rise, novel form and the like, so that the requirements on the performance of the concrete are more severe, and the common concrete can not meet the requirements of the current engineering construction; among them, the brittleness of concrete is the greatest disadvantage, and cannot be improved by the material.
It has long been found that the addition of hair, weeds, fibres and the like to inorganic cementitious materials reduces brittleness and reduces cracking, for example by incorporating straw or weeds into clay for building walls. For this reason, researchers have proposed that fibers can be incorporated into the cement matrix to improve its brittleness performance, and fiber concrete has come to live. The fiber concrete is a composite material which is composed of cement paste, mortar or concrete as a matrix and fibers as reinforcing materials, wherein the fibers are various and comprise metal fibers, inorganic nonmetal fibers, synthetic fibers, natural organic fibers and the like; however, long-term experimental studies have found that the bonding strength between the steel fibers and the concrete matrix is not high, the steel fibers and the matrix are easy to peel off after being damaged, and the toughening effect of the steel fibers cannot be fully exerted, and the main reasons are two reasons: one is that the steel fiber is easy to corrode in the concrete, the corrosion layer is of a fluffy structure, so that the steel fiber and the concrete are stripped, and the other is that the steel fiber and the concrete are mainly combined by friction force, so that the bonding strength is not high. Therefore, the application aims to improve the corrosivity of the steel fiber and the binding force between the steel fiber and the concrete, and prepare the high-ductility concrete with high bending toughness.
Disclosure of Invention
In order to solve the technical problems mentioned in the background art, the present invention aims to provide a high-ductility concrete with high bending toughness and a preparation method thereof.
The purpose of the invention can be realized by the following technical scheme:
a high-ductility concrete with high bending toughness comprises the following components in parts by weight: 450-480 parts of Portland cement, 120-150 parts of mineral powder, 510-540 parts of fine aggregate, 65-80 parts of composite reinforced fiber, 4.2-4.4 parts of water reducing agent and 180-200 parts of water;
the composite reinforced fiber is prepared by the following method:
step A1: mixing a silane coupling agent KH550 and tetrahydrofuran, slowly dropwise adding phosphorus oxychloride under the stirring condition of 500-600rpm for reaction for 2-3h, carrying out substitution reaction on amino groups on molecules of the silane coupling agent KH550 and chlorine groups of the phosphorus oxychloride, then carrying out rotary evaporation to recover the tetrahydrofuran to obtain a chelating agent, diluting the chelating agent with water to obtain a modified solution, adding steel fibers into the modified solution, soaking for 12h at room temperature, wherein the chelating agent has good chelating effect with the steel fibers, attaching the chelating agent to the surfaces of the steel fibers, coating siloxane groups on the surfaces of the steel fibers, taking out the steel fibers, leaching and drying to obtain the modified steel fibers;
further, the dosage ratio of the phosphorus oxychloride to the silane coupling agent KH550 to the tetrahydrofuran is 0.1mol:0.32-0.35mol:200-280mL.
Further, the dosage ratio of the steel fiber to the chelating agent is 10g:1.5-1.8g, the content of the chelating agent in the modification solution is 3.5-4.5wt%, and the steel fiber is selected from filaments prepared by a molten steel drawing method, and the diameter of the steel fiber is 0.15mm.
Step A2: mixing and crushing the fly ash, the desulfurized gypsum, the silica fume and the zeolite to be not less than 325 meshes, adding water and polyvinyl alcohol, and uniformly stirring to prepare alkali paste;
further, the mass ratio of the fly ash to the desulfurized gypsum to the silica fume to the zeolite is 1:0.35-0.42:0.1-0.14:0.05-0.08.
Furthermore, the water content of the alkali paste is 78-82%, and the ratio of polyvinyl alcohol is 0.7-0.9wt%.
Step A3: coating alkali paste on the surface of the modified steel fiber, baking for 30-40min at 55-60 ℃ for shaping, under the alkaline condition, reacting siloxane groups introduced into the surface of the modified steel fiber with inorganic particles in the alkali paste, tightly attaching the alkali paste to the surface of the fiber, then placing the fiber in a baking furnace, firstly heating to 160-180 ℃, insulating and baking for 30-40min, then heating to 950-1000 ℃, insulating and baking for 1.2-1.5h, sintering the alkali paste to be attached to the surface of the modified steel fiber to form a porous protective layer containing silicon and calcium, cooling to room temperature, and shearing into short fibers with the length of 30-50mm to prepare the composite chopped fibers;
furthermore, the coating amount of the alkali paste on the modified steel fiber is 2.5-2.8g/m.
Step A4: preparing a sodium carbonate solution with the pH value of 8.0-9.0, adding sodium silicate and calcium nitrate, stirring and dissolving, ultrasonically shaking for 20-30min, adding the composite chopped fibers, standing for 24h to form calcium silicate attached and deposited on the surfaces of the composite chopped fibers, filtering, taking filter cakes and drying to prepare the composite reinforced fibers;
further, the dosage ratio of the composite chopped fiber, the sodium silicate, the calcium nitrate and the sodium carbonate solution is 100g:8.5-10g:3-5g:550-600mL.
The preparation method of the high-ductility concrete with high bending toughness comprises the following steps: the Portland cement, the mineral powder, the fine aggregate, the composite reinforced fiber and the water reducing agent are mixed, and then water is added for even stirring, so that the high-ductility concrete with high bending toughness is prepared.
The invention has the beneficial effects that:
the invention adds a composite reinforced fiber in concrete, which takes steel fiber as a core material, prepares a chelating agent containing phosphorus through a silane coupling agent KH550 and phosphorus oxychloride substitution reaction, attaches an organic matter containing siloxane groups to the surface of the steel fiber after the treatment, improves the surface activity of the steel fiber, coats an alkali paste taking fly ash as a main material on the surface, modifies the siloxane groups introduced to the surface of the steel fiber to react with inorganic particles in the alkali paste, tightly attaches the alkali paste to the surface of the fiber, forms a porous protective layer containing calcium silicon after sintering, and then loads calcium silicate in a porous structure through a deposition method.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1, this example prepared composite reinforcing fibers as follows:
a1, mixing a silane coupling agent KH550 with tetrahydrofuran, mechanically stirring at 600rpm, slowly dropwise adding phosphorus oxychloride within 40min, continuously keeping stirring reaction after dropwise adding, and integrally adding the mixture for 2h, wherein the dosage ratio of the phosphorus oxychloride to the silane coupling agent KH550 to the tetrahydrofuran is 0.1mol:0.35mol:280mL, carrying out rotary evaporation after reaction to recover tetrahydrofuran, and preparing a rotary evaporation product into a chelating agent;
preparing a chelating agent and water into a modification solution with the concentration of 5.5wt%, taking a steel fiber filament prepared by a molten steel drawing method, wherein the diameter of the steel fiber filament is 0.15mm, immersing the steel fiber into the modification solution according to the dosage of 1.5g/10g of the chelating agent, soaking for 12h at room temperature, taking out the steel fiber, leaching with water, and drying with hot air for 10min to prepare the modified steel fiber.
a2, mixing fly ash, desulfurized gypsum, silica fume and zeolite according to a mass ratio of 1:0.35, 0.14, screening by adopting a 325-mesh screen, adding water and polyvinyl alcohol, uniformly stirring, controlling the polyvinyl alcohol content to be 0.9wt% and the water content to be 82%, and preparing into an alkali paste.
and a3, coating the alkali paste on the surface of the modified steel fiber, controlling the coating amount to be 2.8g/m, drying the coated fiber at 60 ℃ for 30min for shaping, then placing the shaped fiber in a roasting furnace, firstly heating to 180 ℃, carrying out heat preservation roasting for 30min, then heating to 1000 ℃, carrying out heat preservation roasting for 1.2h, cooling to room temperature, and shearing the shaped fiber into short fibers with the length of 30mm by using a punching machine to prepare the composite chopped fiber.
and a4, dissolving and diluting sodium carbonate into a sodium carbonate solution with a pH value of 9.0 by using water, adding sodium silicate and calcium nitrate, stirring and dissolving, ultrasonically dispersing for 20min at 28kHz, adding composite chopped fibers, and standing for 24h, wherein the dosage ratio of the composite chopped fibers to the sodium silicate to the calcium nitrate to the sodium carbonate solution is 100g:10g:5g:600mL, filtering to obtain a filter cake, and drying at 60 ℃ for 3h to prepare the composite reinforced fiber.
Example 2, this example prepares composite reinforcing fibers as follows:
a1, mixing a silane coupling agent KH550 with tetrahydrofuran, mechanically stirring at 500rpm, slowly dropwise adding phosphorus oxychloride within 60min, continuously keeping stirring reaction after dropwise adding, and integrally adding for 3h, wherein the dosage ratio of the phosphorus oxychloride to the silane coupling agent KH550 to the tetrahydrofuran is 0.1mol:0.32mol:200mL, carrying out rotary evaporation after reaction to recover tetrahydrofuran, and preparing a rotary evaporation product into a chelating agent;
preparing a chelating agent and water into a modified solution with the concentration of 7.5wt%, taking a steel fiber filament prepared by a molten steel drawing method, wherein the diameter of the steel fiber filament is 0.15mm, immersing the steel fiber into the modified solution according to the dosage of 1.8g/10g of the chelating agent, soaking for 12h at room temperature, taking out the steel fiber, leaching with water, and drying with hot air for 10min to prepare the modified steel fiber.
a2, mixing the fly ash, the desulfurized gypsum, the silica fume and the zeolite according to a mass ratio of 1: 0.42.
and a3, coating the alkali paste on the surface of the modified steel fiber, controlling the coating amount to be 2.5g/m, drying the coated fiber at 55 ℃ for 40min for shaping, then placing the shaped fiber in a roasting furnace, firstly heating to 160 ℃, carrying out heat preservation roasting for 40min, then heating to 950 ℃, carrying out heat preservation roasting for 1.5h, cooling to room temperature, and shearing the shaped fiber into short fibers with the length of 50mm by using a punching machine to prepare the composite chopped fiber.
and a4, dissolving and diluting sodium carbonate into a sodium carbonate solution with a pH value of 8.0 by using water, adding sodium silicate and calcium nitrate, stirring and dissolving, performing ultrasonic dispersion for 30min at 28kHz, adding composite chopped fibers, and standing for 24h, wherein the dosage ratio of the composite chopped fibers to the sodium silicate to the calcium nitrate to the sodium carbonate solution is 100g:8.5g:3g:550mL, filtering to obtain a filter cake, and drying at 60 ℃ for 3 hours to prepare the composite reinforced fiber.
Example 3, this example prepares composite reinforcing fibers as follows:
a1, mixing a silane coupling agent KH550 with tetrahydrofuran, mechanically stirring at 600rpm, slowly dropwise adding phosphorus oxychloride within 50min, continuously keeping stirring reaction after dropwise adding, and integrally adding for 2.2h, wherein the dosage ratio of the phosphorus oxychloride to the silane coupling agent KH550 to the tetrahydrofuran is 0.1mol:0.34mol:250mL, performing rotary evaporation to recover tetrahydrofuran after reaction, and preparing a chelating agent from a rotary evaporation product;
preparing a chelating agent and water into a modification solution with the concentration of 6.0wt%, taking a steel fiber filament prepared by a molten steel drawing method, wherein the diameter of the steel fiber filament is 0.15mm, immersing the steel fiber into the modification solution according to the dosage of 1.6g/10g of the chelating agent, immersing for 12 hours at room temperature, taking out the steel fiber, rinsing with water, and drying with hot air for 10min to prepare the modified steel fiber.
a2, mixing fly ash, desulfurized gypsum, silica fume and zeolite according to a mass ratio of 1:0.38, 0.12, and 0.06, and screening by using a 325-mesh screen, adding water and polyvinyl alcohol, uniformly stirring, controlling the polyvinyl alcohol content to be 0.8wt% and the water content to be 80%, and preparing into an alkali paste.
and a3, coating the alkali paste on the surface of the modified steel fiber, controlling the coating amount to be 2.6g/m, drying the coated fiber at 60 ℃ for 35min for shaping, then placing the shaped fiber in a roasting furnace, firstly heating to 170 ℃, carrying out heat preservation roasting for 40min, then heating to 980 ℃, carrying out heat preservation roasting for 1.3h, cooling to room temperature, and shearing the shaped fiber into short fibers with the length of 50mm by using a punching machine to prepare the composite chopped fiber.
and a4, dissolving and diluting sodium carbonate into a sodium carbonate solution with a pH value of 9.0 by using water, adding sodium silicate and calcium nitrate, stirring and dissolving, ultrasonically dispersing for 30min at 28kHz, adding composite chopped fibers, and standing for 24h, wherein the dosage ratio of the composite chopped fibers to the sodium silicate to the calcium nitrate to the sodium carbonate solution is 100g:9g:4g:580mL, filtering and taking a filter cake, and drying the filter cake at 60 ℃ for 3h to prepare the composite reinforced fiber.
Example 4, this example prepared composite reinforcing fibers as follows:
a1, mixing a silane coupling agent KH550 with tetrahydrofuran, mechanically stirring at 600rpm, slowly dropwise adding phosphorus oxychloride within 60min, continuously keeping stirring reaction after dropwise adding, and integrally adding for 2.5h, wherein the dosage ratio of the phosphorus oxychloride to the silane coupling agent KH550 to the tetrahydrofuran is 0.1mol:0.34mol:280mL, carrying out rotary evaporation after reaction to recover tetrahydrofuran, and preparing a rotary evaporation product into a chelating agent;
preparing a chelating agent and water into a modified solution with the concentration of 7.0wt%, taking a steel fiber filament prepared by a molten steel drawing method, wherein the diameter of the steel fiber filament is 0.15mm, immersing the steel fiber into the modified solution according to the dosage of 1.6g/10g of the chelating agent, soaking for 12h at room temperature, taking out the steel fiber, leaching with water, and drying with hot air for 10min to prepare the modified steel fiber.
a2, mixing the fly ash, the desulfurized gypsum, the silica fume and the zeolite according to a mass ratio of 1: 0.4.
and a3, coating the alkali paste on the surface of the modified steel fiber, controlling the coating amount to be 2.5g/m, drying the coated fiber at 55 ℃ for 35min for shaping, then placing the shaped fiber in a roasting furnace, firstly heating to 180 ℃, carrying out heat preservation roasting for 40min, then heating to 980 ℃, carrying out heat preservation roasting for 1.5h, cooling to room temperature, and shearing the shaped fiber into short fibers with the length of 40mm by using a punching machine to prepare the composite chopped fiber.
and a4, dissolving and diluting sodium carbonate into a sodium carbonate solution with a pH value of 9.0 by using water, adding sodium silicate and calcium nitrate, stirring and dissolving, performing ultrasonic dispersion for 25min at 28kHz, adding composite chopped fibers, and standing for 24h, wherein the dosage ratio of the composite chopped fibers to the sodium silicate to the calcium nitrate to the sodium carbonate solution is 100g:9.5g:4.5g:600mL, filtering to obtain a filter cake, and drying at 60 ℃ for 3h to prepare the composite reinforced fiber.
The following examples prepare high tensile concrete with high flexural toughness, the formulation of which involves the following raw materials:
portland cement selected from p.o42.5r portland cement produced by ansu seasnail cement gmbh;
mineral powder selected from S95 grade mineral powder, produced by new building materials of Wuhan Wu Ghan Co Ltd;
the fine aggregate is selected from natural river sand, the fineness modulus is 2.6, and the specific gradation is shown in table 1:
the water reducing agent is selected from PCA-I high-efficiency polycarboxylic acid water reducing agent and is produced by Jiangsu Subo New Material Co.
The preparation method of the concrete comprises the following steps: adding portland cement, mineral powder, fine aggregate, composite reinforced fiber and water reducing agent into a mixer, stirring at 60rpm for 10min, and adding water according to the ratio of 3:1, distributing, adding the mixture into the mixture twice, and stirring the mixture for 12min to prepare concrete;
the specific ingredients are shown in table 2:
taking a cube mold with the side length of 100mm and a prism mold with the size of 40 multiplied by 160mm, injecting concrete, vibrating, compacting, leveling, standing, removing the mold after 40 hours, performing standard maintenance for 28 days, and obtaining a cube and a prism sample with the age of 56 days;
taking a cubic sample, uniformly loading at a loading rate of 5kN/s, and testing the compressive strength of the sample, wherein the specific test data are shown in Table 3:
as can be seen from the data in Table 3, the concrete prepared by the invention has the compression strength of 62.15-65.70MPa and good compression resistance.
Based on the test data, a cubic sample is taken, the sample is loaded at a constant speed according to the loading rate of 2kN/s until the compressive strength is 80%, the sample is naturally maintained for 90 days after pressure relief, and the compressive test is carried out again, wherein the specific test data are shown in Table 4:
as can be seen from the data in Table 4, the concrete prepared by the invention has the advantages that the secondary compressive strength is kept between 61.85 and 63.95MPa, and the concrete has good compressive toughness and damage resistance.
Taking the prism sample prepared above, and carrying out an anti-fracture test by adopting a three-point anti-fracture test method, wherein the loading rate is 0.5kN/s, and the specific test data is shown in Table 5:
as can be seen from the data in Table 5, the concrete prepared by the invention has the flexural strength of 23.45-25.80MPa and good flexural resistance.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.
Claims (8)
1. The high-ductility concrete with high bending toughness is characterized by comprising the following components in parts by weight: 450-480 parts of portland cement, 120-150 parts of mineral powder, 510-540 parts of fine aggregate, 65-80 parts of composite reinforced fiber, 4.2-4.4 parts of water reducing agent and 180-200 parts of water;
the composite reinforced fiber is prepared by the following method:
step A1: mixing a silane coupling agent KH550 and tetrahydrofuran, slowly dropwise adding phosphorus oxychloride under stirring to react for 2-3h, carrying out rotary evaporation to recover tetrahydrofuran to obtain a chelating agent, diluting the chelating agent with water to obtain a modified solution, adding steel fibers into the modified solution, soaking at room temperature for 12h, taking out the steel fibers, leaching and drying to obtain modified steel fibers;
step A2: mixing and crushing the fly ash, the desulfurized gypsum, the silica fume and the zeolite to be not less than 325 meshes, adding water and polyvinyl alcohol, and uniformly stirring to prepare alkali paste;
step A3: coating the alkali paste on the surface of the modified steel fiber, baking for 30-40min at 55-60 ℃, shaping, then placing in a baking furnace, heating to 160-180 ℃, keeping warm, baking for 30-40min, heating to 950-1000 ℃, keeping warm, baking for 1.2-1.5h, cooling to room temperature, and shearing into short fibers with the length of 30-50mm to prepare the composite chopped fibers;
step A4: preparing a sodium carbonate solution with the pH value of 8.0-9.0, adding sodium silicate and calcium nitrate, stirring and dissolving, ultrasonically shaking for 20-30min, adding the composite chopped fiber, standing for 24h, filtering, taking a filter cake, and drying to prepare the composite reinforced fiber.
2. The high ductile concrete with high bending toughness according to claim 1, wherein phosphorus oxychloride, silane coupling agent KH550 and tetrahydrofuran are used in an amount ratio of 0.1mol:0.32-0.35mol:200-280mL.
3. The high ductile concrete with high bending toughness according to claim 2, wherein the steel fiber and the chelating agent are used in a ratio of 10g:1.5-1.8g, the content of the chelating agent in the modification liquid is 3.5-4.5wt%, and the diameter of the steel fiber is 0.15mm.
4. The high-ductility concrete with high bending toughness as claimed in claim 1, wherein the mass ratio of the fly ash, the desulfurized gypsum, the silica fume and the zeolite is 1:0.35-0.42:0.1-0.14:0.05-0.08.
5. The highly ductile concrete with high bending toughness according to claim 4, wherein the water content of the alkali paste is 78-82% and the polyvinyl alcohol is 0.7-0.9wt%.
6. The high ductile concrete according to any one of claims 3 and 5, wherein the alkali paste is coated on the modified steel fiber in an amount of 2.5 to 2.8g/m.
7. The highly ductile concrete with high bending toughness according to claim 6, wherein the amount ratio of the composite chopped fibers, the sodium silicate, the calcium nitrate and the sodium carbonate solution is 100g:8.5-10g:3-5g:550-600mL.
8. The method of claim 1, wherein the highly ductile concrete having high bending toughness is prepared by mixing portland cement, mineral powder, fine aggregate, composite reinforcing fiber, and a water reducing agent, adding water, and stirring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310250821.XA CN115959873B (en) | 2023-03-16 | 2023-03-16 | High-ductility concrete with high bending toughness and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310250821.XA CN115959873B (en) | 2023-03-16 | 2023-03-16 | High-ductility concrete with high bending toughness and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115959873A true CN115959873A (en) | 2023-04-14 |
| CN115959873B CN115959873B (en) | 2023-05-09 |
Family
ID=85899668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310250821.XA Active CN115959873B (en) | 2023-03-16 | 2023-03-16 | High-ductility concrete with high bending toughness and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115959873B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000053871A (en) * | 1998-08-07 | 2000-02-22 | Toray Ind Inc | Resin composition and its preparation |
| CN105936725A (en) * | 2016-06-22 | 2016-09-14 | 芜湖市长江起重设备制造有限公司 | Self-adhesive carbon fiber and steel fiber modified polytetrafluoroethylene material and preparation method thereof |
| CN108395131A (en) * | 2018-03-09 | 2018-08-14 | 成都新柯力化工科技有限公司 | A kind of steel fibre and preparation method for repairing building concrete microcrack |
| CN111517718A (en) * | 2020-04-26 | 2020-08-11 | 上海兆捷实业发展有限公司 | Steel fiber high-strength concrete and preparation method thereof |
| CN112960927A (en) * | 2021-01-25 | 2021-06-15 | 哈尔滨工业大学（深圳） | Nano material adsorption steel fiber and preparation method and application thereof |
| CN114656181A (en) * | 2022-04-15 | 2022-06-24 | 山东鲁桥建材有限公司 | Preparation method of surface hyperbranched modified steel fiber and ultrahigh-performance concrete based on modified steel fiber |
-
2023
- 2023-03-16 CN CN202310250821.XA patent/CN115959873B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000053871A (en) * | 1998-08-07 | 2000-02-22 | Toray Ind Inc | Resin composition and its preparation |
| CN105936725A (en) * | 2016-06-22 | 2016-09-14 | 芜湖市长江起重设备制造有限公司 | Self-adhesive carbon fiber and steel fiber modified polytetrafluoroethylene material and preparation method thereof |
| CN108395131A (en) * | 2018-03-09 | 2018-08-14 | 成都新柯力化工科技有限公司 | A kind of steel fibre and preparation method for repairing building concrete microcrack |
| CN111517718A (en) * | 2020-04-26 | 2020-08-11 | 上海兆捷实业发展有限公司 | Steel fiber high-strength concrete and preparation method thereof |
| CN112960927A (en) * | 2021-01-25 | 2021-06-15 | 哈尔滨工业大学（深圳） | Nano material adsorption steel fiber and preparation method and application thereof |
| CN114656181A (en) * | 2022-04-15 | 2022-06-24 | 山东鲁桥建材有限公司 | Preparation method of surface hyperbranched modified steel fiber and ultrahigh-performance concrete based on modified steel fiber |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115959873B (en) | 2023-05-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111039624A (en) | Recycled concrete and preparation method thereof | |
| CN106396555A (en) | Cellulose fiber internal curing-based ultra-high-performance cement-based composite material and preparation method thereof | |
| EP2142486B1 (en) | A method of making a low density additive | |
| CN113416050A (en) | Asbestos-free light high-strength fireproof calcium silicate board and preparation method thereof | |
| CN114436601A (en) | Recycled aggregate self-compacting concrete and preparation method thereof | |
| CN107382346B (en) | refractory wear-resistant pouring material and preparation method thereof | |
| CN111646764A (en) | Whisker modified hydrated magnesium silicate material and preparation method and application thereof | |
| Jiang et al. | Effect of straw fiber modification methods on compatibility between straw fibers and cement-based materials | |
| CN115959873B (en) | High-ductility concrete with high bending toughness and preparation method thereof | |
| CN113024182A (en) | High-toughness high-cohesiveness C80-strength fiber concrete and preparation method thereof | |
| He et al. | Effect of pressing pressure on the mechanical properties and water resistance of straw/sawdust-magnesium oxychloride cement composite | |
| CN101745986B (en) | Composite material of paper slag sludge and inorganic polymers and the preparation method thereof | |
| CN114315197B (en) | Fiber concrete interface modifier and modification method | |
| CN114524658B (en) | Preparation method of ferric phosphate magnesium oxysulfate composite cement-based 3D printing material | |
| CN108840713A (en) | A kind of composite sound-absorbing material | |
| CN114394798A (en) | Environment-friendly solid waste recycled concrete and preparation process thereof | |
| CN112919856A (en) | Fiber geopolymer concrete and preparation method thereof | |
| KR101953875B1 (en) | Concrete composite using cellulose nanocrystal(cnc) and manufacturing method thereof | |
| CN113024187A (en) | High-toughness high-cohesiveness C50-strength fiber concrete and preparation method thereof | |
| CN113185212A (en) | High-toughness high-cohesiveness C70-strength fiber concrete and preparation method thereof | |
| Mohammadkazemi et al. | Rice husk and old corrugated container cement boards: Performance of nano-SiO2 on strength and dimensional stability | |
| CN116063055B (en) | Light calcium silicate board | |
| CN110981346B (en) | High-temperature-resistant civil construction material with good heat preservation effect and preparation method thereof | |
| CN109081667A (en) | A kind of composite sound-absorbing material | |
| KR102658997B1 (en) | High-performance cement mortar composition for precast fume pipes and manufacturing method of precast fume pipes using the same |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20240314 Address after: No. 3, Xinsan Group, Xinlian Village, Dayan Township, Shitai County, Chizhou City, Anhui Province, 245100 Patentee after: Shu Langping Country or region after: China Address before: Shucheng Town Shucheng Village, Hejian City, Cangzhou City, Hebei Province 061000 Patentee before: Hebei Lvbang Technology Development Co.,Ltd. Country or region before: China |
|
| TR01 | Transfer of patent right |