CN116199481B - Ultra-high performance concrete with low shrinkage and preparation method thereof - Google Patents
Ultra-high performance concrete with low shrinkage and preparation method thereof Download PDFInfo
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- CN116199481B CN116199481B CN202310220420.XA CN202310220420A CN116199481B CN 116199481 B CN116199481 B CN 116199481B CN 202310220420 A CN202310220420 A CN 202310220420A CN 116199481 B CN116199481 B CN 116199481B
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- silane coupling
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- 239000011374 ultra-high-performance concrete Substances 0.000 title claims abstract description 27
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 229920002748 Basalt fiber Polymers 0.000 claims abstract description 63
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 29
- 239000011347 resin Substances 0.000 claims abstract description 27
- 229920005989 resin Polymers 0.000 claims abstract description 27
- UKRDPEFKFJNXQM-UHFFFAOYSA-N vinylsilane Chemical compound [SiH3]C=C UKRDPEFKFJNXQM-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000000835 fiber Substances 0.000 claims abstract description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 69
- 239000005543 nano-size silicon particle Substances 0.000 claims description 28
- 235000012239 silicon dioxide Nutrition 0.000 claims description 28
- 239000000203 mixture Substances 0.000 claims description 24
- 239000002250 absorbent Substances 0.000 claims description 21
- 238000006243 chemical reaction Methods 0.000 claims description 21
- 238000003756 stirring Methods 0.000 claims description 20
- 239000007795 chemical reaction product Substances 0.000 claims description 13
- 239000003638 chemical reducing agent Substances 0.000 claims description 13
- 238000001035 drying Methods 0.000 claims description 13
- 238000001914 filtration Methods 0.000 claims description 13
- NFMWFGXCDDYTEG-UHFFFAOYSA-N trimagnesium;diborate Chemical compound [Mg+2].[Mg+2].[Mg+2].[O-]B([O-])[O-].[O-]B([O-])[O-] NFMWFGXCDDYTEG-UHFFFAOYSA-N 0.000 claims description 13
- 238000005406 washing Methods 0.000 claims description 13
- 239000004593 Epoxy Substances 0.000 claims description 12
- 239000004113 Sepiolite Substances 0.000 claims description 12
- 239000004568 cement Substances 0.000 claims description 12
- 239000010881 fly ash Substances 0.000 claims description 12
- 239000004576 sand Substances 0.000 claims description 12
- 229910052624 sepiolite Inorganic materials 0.000 claims description 12
- 235000019355 sepiolite Nutrition 0.000 claims description 12
- 229920002545 silicone oil Polymers 0.000 claims description 12
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 11
- 239000011707 mineral Substances 0.000 claims description 11
- 238000006116 polymerization reaction Methods 0.000 claims description 11
- 239000000843 powder Substances 0.000 claims description 11
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 claims description 9
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 9
- HRPVXLWXLXDGHG-UHFFFAOYSA-N Acrylamide Chemical compound NC(=O)C=C HRPVXLWXLXDGHG-UHFFFAOYSA-N 0.000 claims description 9
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 claims description 9
- 239000011837 N,N-methylenebisacrylamide Substances 0.000 claims description 8
- 238000000465 moulding Methods 0.000 claims description 8
- ZIUHHBKFKCYYJD-UHFFFAOYSA-N n,n'-methylenebisacrylamide Chemical compound C=CC(=O)NCNC(=O)C=C ZIUHHBKFKCYYJD-UHFFFAOYSA-N 0.000 claims description 8
- 239000008367 deionised water Substances 0.000 claims description 7
- 229910021641 deionized water Inorganic materials 0.000 claims description 7
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 7
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 6
- 230000003213 activating effect Effects 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- 239000007822 coupling agent Substances 0.000 claims description 5
- FWDBOZPQNFPOLF-UHFFFAOYSA-N ethenyl(triethoxy)silane Chemical compound CCO[Si](OCC)(OCC)C=C FWDBOZPQNFPOLF-UHFFFAOYSA-N 0.000 claims description 5
- NKSJNEHGWDZZQF-UHFFFAOYSA-N ethenyl(trimethoxy)silane Chemical group CO[Si](OC)(OC)C=C NKSJNEHGWDZZQF-UHFFFAOYSA-N 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 239000002904 solvent Substances 0.000 claims description 2
- GQIUQDDJKHLHTB-UHFFFAOYSA-N trichloro(ethenyl)silane Chemical compound Cl[Si](Cl)(Cl)C=C GQIUQDDJKHLHTB-UHFFFAOYSA-N 0.000 claims description 2
- 239000005050 vinyl trichlorosilane Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 claims 6
- 239000004567 concrete Substances 0.000 abstract description 26
- 230000004048 modification Effects 0.000 abstract description 5
- 238000012986 modification Methods 0.000 abstract description 5
- 238000005336 cracking Methods 0.000 abstract description 3
- 239000006185 dispersion Substances 0.000 abstract description 3
- 238000007259 addition reaction Methods 0.000 abstract description 2
- 239000011203 carbon fibre reinforced carbon Substances 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- 239000000126 substance Substances 0.000 abstract description 2
- 230000008602 contraction Effects 0.000 abstract 1
- 230000002522 swelling effect Effects 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 9
- 238000012360 testing method Methods 0.000 description 8
- 238000005266 casting Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 239000006004 Quartz sand Substances 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000004925 denaturation Methods 0.000 description 1
- 230000036425 denaturation Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000011068 loading method Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/34—Non-shrinking or non-cracking materials
- C04B2111/343—Crack resistant materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- 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
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses ultra-high performance concrete with low contractility and a preparation method thereof, wherein vinyl silane coupling agent is firstly utilized to carry out grafting modification on basalt fiber, then water-absorbing resin is grafted on the surface of basalt fiber through addition reaction of carbon-carbon double bond, good compatibility of fiber and concrete is facilitated, the dispersion effect of the water-absorbing resin in the concrete is improved, the water-absorbing resin has a good three-dimensional network structure, free water is fixed in the resin through swelling effect, water can be slowly released in a dry environment, and the water-absorbing resin is doped into the concrete, so that the chemical contraction of the concrete can be counteracted, the self-contraction of the concrete can be effectively reduced, the early shrinkage cracking of the concrete can be restrained, and the strength of the concrete can be further improved.
Description
Technical Field
The invention relates to the technical field of concrete preparation, in particular to ultra-high performance concrete with low shrinkage and a preparation method thereof.
Background
The ultra-high performance concrete (UHPC) is a cement-based material based on close packing of aggregate and cementing material, low water-gel ratio and steel fiber reinforcement, has ultra-high strength, high toughness and excellent durability, is gradually developed in a plurality of engineering fields in recent years, has the maximum aggregate particle size of less than 8mm, generally has the aggregate particle size of less than 2.36mm, has the water-gel ratio of less than 0.24, has the compressive strength of not less than 150MPa, has the anti-abrasion performance obviously superior to that of the common steel fiber concrete, and is a novel anti-abrasion material suitable for the engineering fields such as hydraulic engineering under the action of high-speed sand-containing water flow.
Compared with common concrete, the ultra-high performance concrete has the advantages of high hydration heat release and high self-shrinkage, and the early shrinkage cracking is more serious than that of the common concrete, so that the development and application of the ultra-high performance concrete are greatly restricted.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the ultra-high performance concrete with low contractility and the preparation method thereof, and the prepared ultra-high performance concrete has the characteristics of low contractility and high strength.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the preparation method of the ultra-high performance concrete with low shrinkage comprises the following steps:
(1) Adding basalt fiber to H 2 SO 4 And H 2 O 2 Activating for 1-2h at 100-120 ℃ to obtain activated basalt fiber;
(2) Immersing the activated basalt fiber into a vinyl silane coupling agent solution, stirring for 60-120min at room temperature, then taking out the basalt fiber, and curing for 6-12h at 50-60 ℃ to obtain a vinyl silane coupling agent modified basalt fiber;
(3) Adding vinyl silane coupling agent modified basalt fiber, acrylic acid and acrylamide into deionized water, then adding N, N-methylene bisacrylamide and potassium persulfate, carrying out polymerization reaction in nitrogen atmosphere, and after the reaction is finished, filtering, washing and drying a reaction product to obtain the water-absorbent resin grafted basalt fiber;
(4) Dispersing nano silicon dioxide in toluene solvent, adding epoxy silicone oil into the solvent, heating and stirring the mixture for reaction, and filtering, washing and drying a reaction product after the reaction is completed to obtain modified nano silicon dioxide;
(5) And uniformly stirring and mixing cement, fly ash, mineral powder, natural sand, a water reducing agent, magnesium borate whisker and modified nano silicon dioxide according to a weight ratio to obtain a mixture, adding water into the mixture, stirring uniformly, adding the water-absorbent resin grafted basalt fiber and sepiolite fiber, uniformly stirring, pouring into a mould, and pouring and molding to obtain the ultra-high performance concrete with low shrinkage.
Preferably, in step (1), H 2 SO 4 Solution and H 2 O 2 The mass ratio of the solution is 4-6:1, H 2 SO 4 The mass fraction of the solution is 40-60%, H 2 O 2 The mass fraction of the solution is 20-30%.
Preferably, in the step (2), the mass ratio of the activated basalt fiber to the vinyl silane coupling agent solution is 10-15:100, and the mass fraction of the vinyl silane coupling agent solution is 2-4%.
Preferably, in the step (2), the vinyl silane coupling agent is a vinyl trimethoxy silane coupling agent, a vinyl triethoxy silane coupling agent or a vinyl trichlorosilane coupling agent.
Preferably, in the step (3), the mass ratio of the vinyl silane coupling agent modified basalt fiber, the acrylic acid, the acrylamide, the N, N-methylene bisacrylamide and the potassium persulfate is 2-4:5-10:5-10:0.05-0.1:0.4-0.8.
Preferably, in the step (3), the polymerization temperature is 60-80 ℃ and the polymerization time is 3-5h.
Preferably, in the step (4), the mass ratio of the nano silicon dioxide to the epoxy silicone oil is 10-15:4-6.
Preferably, in the step (4), the reaction temperature is 50-70 ℃ and the reaction time is 4-6h.
Preferably, in the step (5), the mass ratio of cement, fly ash, mineral powder, natural sand, water reducer, magnesium borate whisker, modified nano silicon dioxide, water-absorbent resin grafted basalt fiber, sepiolite fiber and water is 420-480:40-60:100-120:500-600:10-15:4-6:8-12:8-12:10-20:200-240.
The invention also provides the ultra-high performance concrete with low shrinkage prepared by the preparation method.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the invention, the vinyl silane coupling agent is used for grafting modification on basalt fiber, and then the water-absorbent resin is grafted on the surface of the basalt fiber through addition reaction of carbon-carbon double bonds, so that good compatibility of the fiber and concrete is facilitated, the dispersion effect of the water-absorbent resin in the concrete is improved, the water-absorbent resin has a good three-dimensional network structure, free water is fixed in the resin through swelling, the water can be slowly released in a dry environment, and the water-absorbent resin is doped into the concrete, so that not only can the chemical shrinkage of the concrete be counteracted, but also the self-shrinkage of the concrete can be effectively reduced, the early shrinkage cracking of the concrete is restrained, and the strength of the concrete is further improved.
(2) According to the invention, epoxy silicone oil is used for carrying out surface grafting modification on nano silicon dioxide, so that the dispersion performance of the nano silicon dioxide in concrete is improved, and meanwhile, active groups in the modified nano silicon dioxide can react with groups in the basalt fiber grafted with the water-absorbent resin to form a framework structure, so that the shrinkage denaturation inhibiting capability is improved, and the strength of the concrete is further improved.
(3) The basalt fiber provided by the invention has the length of 6-20mm, the sepiolite fiber has the length of 1-4mm, the magnesium borate whisker has the length of 50-200 mu m, and the strength and the durability of the concrete are improved by mutually supplementing the three fibers in different size layers through the synergistic effect.
Detailed Description
The present invention will be described in further detail with reference to the following preferred examples, but the present invention is not limited to the following examples.
Unless otherwise specified, the chemical reagents involved in the present invention are all commercially available.
The basalt fiber used in the invention has the length of 6-20mm and the diameter of 13-17 mu m, and is purchased from Thailand composite material Co., ltd;
sepiolite fibers with a length of 1-4mm are available from Shijia Ma Yuan building materials Co., ltd;
the length of the magnesium borate whisker is 50-200 mu m, and the magnesium borate whisker is purchased from the Wuhan Kano science and technology Co., ltd;
the particle size of the nano silicon dioxide is 20nm;
the epoxy silicone oil is double-end epoxy silicone oil, the model is HY-2610, and the epoxy silicone oil is purchased from Shanghai Hui Ming's New Material Co;
the cement is PO52.5 ordinary Portland cement;
the fly ash is class II fly ash;
the specification grade of the mineral powder is S95 grade;
the natural sand is natural quartz sand with the granularity of 70-120 meshes;
the water reducer is a polycarboxylic acid water reducer, the product model is AM-J1, and the water reducer is purchased from New Material Co., ltd.
Example 1
The preparation method of the ultra-high performance concrete with low shrinkage comprises the following steps:
(1) Will be20g basalt fiber was added to 80g 40wt% H 2 SO 4 And 20g,20wt% H 2 O 2 Activating for 1h at 100 ℃ to obtain activated basalt fibers;
(2) Immersing 10g of activated basalt fiber into 100g of 2wt% vinyl trimethoxy silane coupling agent solution, stirring for 60min at room temperature, then taking out the basalt fiber, and curing for 6h at 50 ℃ to obtain vinyl silane coupling agent modified basalt fiber;
(3) Adding 2g of vinyl silane coupling agent modified basalt fiber, 5g of acrylic acid and 8g of acrylamide into 150g of deionized water, then adding 0.05g of N, N-methylene bisacrylamide and 0.4g of potassium persulfate, carrying out polymerization reaction for 3 hours in a nitrogen atmosphere at 60 ℃, and filtering, washing and drying a reaction product after the reaction is finished to obtain the water-absorbent resin grafted basalt fiber;
(4) Dispersing 10g of nano silicon dioxide in 200mL of toluene solvent, adding 4g of double-end epoxy silicone oil into the solution, heating and stirring the solution at 50 ℃ for reaction for 4 hours, and filtering, washing and drying a reaction product after the reaction is completed to obtain modified nano silicon dioxide;
(5) 420g of cement, 40g of fly ash, 100g of mineral powder, 500g of natural sand, 10g of water reducer, 4g of magnesium borate whisker and 8g of modified nano silicon dioxide are stirred and mixed for 300s to obtain a mixture, 200g of water is added into the mixture and stirred for 180s, then 8g of water-absorbent resin grafted basalt fiber and 10g of sepiolite fiber are added, and the mixture is poured into a mold after being stirred for 240s, and casting molding is carried out, so that the ultra-high performance concrete with low shrinkage is obtained.
Example 2
The preparation method of the ultra-high performance concrete with low shrinkage comprises the following steps:
(1) 20g basalt fiber was added to 100g,60wt% H 2 SO 4 And 20g,30wt% H 2 O 2 Activating for 2 hours at 120 ℃ to obtain activated basalt fibers;
(2) Immersing 15g of activated basalt fiber into 100g of 4wt% vinyl triethoxysilane coupling agent solution, stirring for 120min at room temperature, then taking out the basalt fiber, and curing for 12h at 60 ℃ to obtain vinyl silane coupling agent modified basalt fiber;
(3) Adding 4g of vinyl silane coupling agent modified basalt fiber, 6g of acrylic acid and 10g of acrylamide into 150g of deionized water, then adding 0.1g of N, N-methylene bisacrylamide and 0.8g of potassium persulfate, carrying out polymerization reaction for 5 hours in a nitrogen atmosphere at 80 ℃, and filtering, washing and drying a reaction product after the reaction is finished to obtain the water-absorbent resin grafted basalt fiber;
(4) Dispersing 15g of nano silicon dioxide in 200mL of toluene solvent, adding 6g of double-end epoxy silicone oil into the solution, heating and stirring the solution at 70 ℃ for reaction for 6 hours, and filtering, washing and drying a reaction product after the reaction is completed to obtain modified nano silicon dioxide;
(5) 480g of cement, 50g of fly ash, 120g of mineral powder, 600g of natural sand, 15g of water reducer, 6g of magnesium borate whisker and 10g of modified nano silicon dioxide are stirred and mixed for 300s to obtain a mixture, 240g of water is added into the mixture and stirred for 180s, then 12g of water-absorbent resin grafted basalt fiber and 20g of sepiolite fiber are added, and after stirring for 240s, the mixture is poured into a mold, and casting molding is carried out, so that the ultra-high performance concrete with low shrinkage is obtained.
Example 3
The preparation method of the ultra-high performance concrete with low shrinkage comprises the following steps:
(1) 20g basalt fiber was added to 120g,60wt% H 2 SO 4 And 20g,30wt% H 2 O 2 Activating for 2 hours at 100 ℃ to obtain activated basalt fibers;
(2) Immersing 12g of activated basalt fiber into 100g of 4wt% vinyl triethoxysilane coupling agent solution, stirring for 100min at room temperature, then taking out the basalt fiber, and curing for 10h at 55 ℃ to obtain vinyl silane coupling agent modified basalt fiber;
(3) Adding 3g of vinyl silane coupling agent modified basalt fiber, 8g of acrylic acid and 8g of acrylamide into 150g of deionized water, then adding 0.08g of N, N-methylene bisacrylamide and 0.6g of potassium persulfate, carrying out polymerization reaction for 5 hours in a nitrogen atmosphere at 60 ℃, and filtering, washing and drying a reaction product after the reaction is finished to obtain the water-absorbent resin grafted basalt fiber;
(4) Dispersing 12g of nano silicon dioxide in 200mL of toluene solvent, adding 6g of double-end epoxy silicone oil into the solution, heating and stirring the solution at 60 ℃ for reaction for 6 hours, and filtering, washing and drying a reaction product after the reaction is completed to obtain modified nano silicon dioxide;
(5) 450g of cement, 60g of fly ash, 120g of mineral powder, 600g of natural sand, 14g of water reducer, 5g of magnesium borate whisker and 12g of modified nano silicon dioxide are stirred and mixed for 300s to obtain a mixture, 240g of water is added into the mixture and stirred for 180s, then 12g of water-absorbent resin grafted basalt fiber and 16g of sepiolite fiber are added, and the mixture is poured into a mold after being stirred for 240s, and casting molding is carried out, so that the ultra-high performance concrete with low shrinkage is obtained.
Comparative example 1
The preparation method of the ultra-high performance concrete comprises the following steps:
(1) Adding 8g of acrylic acid and 8g of acrylamide into 150g of deionized water, then adding 0.08g of N, N-methylenebisacrylamide and 0.6g of potassium persulfate, carrying out polymerization reaction for 5 hours under nitrogen atmosphere at 60 ℃, and after the reaction is finished, filtering, washing and drying a reaction product to obtain the water-absorbent resin;
(2) Dispersing 12g of nano silicon dioxide in 200mL of toluene solvent, adding 6g of double-end epoxy silicone oil into the solution, heating and stirring the solution at 60 ℃ for reaction for 6 hours, and filtering, washing and drying a reaction product after the reaction is completed to obtain modified nano silicon dioxide;
(3) 450g of cement, 60g of fly ash, 120g of mineral powder, 600g of natural sand, 14g of water reducer, 5g of magnesium borate whisker, 6g of water-absorbent resin and 12g of modified nano silicon dioxide are stirred and mixed for 300s to obtain a mixture, 240g of water is added into the mixture and stirred for 180s, then 6g of basalt fiber and 16g of sepiolite fiber are added, and the mixture is poured into a mold after being stirred for 240s, and casting molding is carried out, so that the ultra-high performance concrete is obtained.
Comparative example 2
The preparation method of the ultra-high performance concrete with low shrinkage comprises the following steps:
(1) 20g basalt fiber was added to 120g,60wt% H 2 SO 4 And 20g,30wt% H 2 O 2 Activating for 2 hours at 100 ℃ to obtain activated basalt fibers;
(2) Immersing 12g of activated basalt fiber into 100g of 4wt% vinyl triethoxysilane coupling agent solution, stirring for 100min at room temperature, then taking out the basalt fiber, and curing for 10h at 55 ℃ to obtain vinyl silane coupling agent modified basalt fiber;
(3) Adding 3g of vinyl silane coupling agent modified basalt fiber, 8g of acrylic acid and 8g of acrylamide into 150g of deionized water, then adding 0.08g of N, N-methylene bisacrylamide and 0.6g of potassium persulfate, carrying out polymerization reaction for 5 hours in a nitrogen atmosphere at 60 ℃, and filtering, washing and drying a reaction product after the reaction is finished to obtain the water-absorbent resin grafted basalt fiber;
(4) 450g of cement, 60g of fly ash, 120g of mineral powder, 600g of natural sand, 14g of water reducer, 5g of magnesium borate whisker and 12g of nano silicon dioxide are stirred and mixed for 300s to obtain a mixture, 240g of water is added into the mixture and stirred for 180s, then 12g of water-absorbent resin grafted basalt fiber and 16g of sepiolite fiber are added, and the mixture is poured into a mold after being stirred for 240s, and casting molding is carried out to obtain the ultra-high performance concrete.
Comparative example 3
The preparation method of the ultra-high performance concrete comprises the following steps:
450g of cement, 60g of fly ash, 120g of mineral powder, 600g of natural sand, 14g of water reducer, 5g of magnesium borate whisker and 12g of nano silicon dioxide are stirred and mixed for 300s to obtain a mixture, 240g of water is added into the mixture and stirred for 180s, then 12g of basalt fiber and 16g of sepiolite fiber are added, and after stirring for 240s, the mixture is poured into a mold, and casting molding is carried out to obtain the ultra-high performance concrete.
The concretes prepared in examples 1-3 and comparative examples 1-3 were subjected to performance testing as follows:
compressive strength: the concrete prepared in the examples 1-3 and the comparative examples 1-3 are made into standard cube test blocks with the side length of 100mm, the standard cube test blocks are cured for 28d under the standard condition, a universal testing machine is adopted for mechanical property test, the loading rate is 1MPa/s, and the compressive strength of the cured concrete for 28d is measured;
shrinkage strain: the concretes prepared in examples 1 to 3 and comparative examples 1 to 3 were prepared into cylindrical test pieces having a diameter of 100mm and a height of 400mm, and tested in a constant temperature and humidity environment at 20℃and a relative humidity of 60%, and after hardening of the concretes, the surface was sealed with paraffin wax, placed in a test stand, and the initial length L after standing for 4 hours was measured using a micrometer mark 0 The lengths of the cured 7d and cured 28d were then tested separately and the shrinkage strain was calculated according to the formula: n= (L) 0 -L t )/L 0 ×10 6 ，L t Length of t days of age;
the test results are shown in the following table:
| 28d compressive Strength (MPa) | 7d self-contraction (mu epsilon) | 28d self-contraction (mu epsilon) | |
| Example 1 | 213 | 39.4 | 68.6 |
| Example 2 | 218 | 36.3 | 67.1 |
| Example 3 | 215 | 37.1 | 67.7 |
| Comparative example 1 | 164 | 59.7 | 114.8 |
| Comparative example 2 | 177 | 52.5 | 108.4 |
| Comparative example 3 | 148 | 74.8 | 153.9 |
Finally, it should be noted that: the above examples are not intended to limit the present invention in any way. Modifications and improvements will readily occur to those skilled in the art upon the basis of the present invention. Accordingly, any modification or improvement made without departing from the spirit of the invention is within the scope of the invention as claimed.
Claims (8)
1. The preparation method of the ultra-high performance concrete with low shrinkage is characterized by comprising the following steps:
(1) Adding basalt fiber to H 2 SO 4 And H 2 O 2 Activating for 1-2h at 100-120 ℃ to obtain activated basalt fiber;
(2) Immersing the activated basalt fiber into a vinyl silane coupling agent solution, stirring for 60-120min at room temperature, then taking out the basalt fiber, and curing for 6-12h at 50-60 ℃ to obtain a vinyl silane coupling agent modified basalt fiber;
(3) Adding vinyl silane coupling agent modified basalt fiber, acrylic acid and acrylamide into deionized water, then adding N, N-methylene bisacrylamide and potassium persulfate, carrying out polymerization reaction in nitrogen atmosphere, and after the reaction is finished, filtering, washing and drying a reaction product to obtain the water-absorbent resin grafted basalt fiber;
(4) Dispersing nano silicon dioxide in toluene solvent, adding epoxy silicone oil into the solvent, heating and stirring the mixture for reaction, and filtering, washing and drying a reaction product after the reaction is completed to obtain modified nano silicon dioxide;
(5) Uniformly stirring and mixing cement, fly ash, mineral powder, natural sand, a water reducing agent, magnesium borate whisker and modified nano silicon dioxide according to a weight ratio to obtain a mixture, adding water into the mixture, uniformly stirring, adding water-absorbent resin grafted basalt fiber and sepiolite fiber, uniformly stirring, pouring into a mould, and pouring and molding to obtain the ultra-high performance concrete with low shrinkage;
in the step (4), the mass ratio of the nano silicon dioxide to the epoxy silicone oil is 10-15:4-6;
in the step (5), the mass ratio of cement, fly ash, mineral powder, natural sand, water reducer, magnesium borate whisker, modified nano silicon dioxide, water-absorbent resin grafted basalt fiber, sepiolite fiber and water is 420-480:40-60:100-120:500-600:10-15:4-6:8-12:8-12:10-20:200-240.
2. The process according to claim 1, wherein in step (1), H 2 SO 4 Solution and H 2 O 2 The mass ratio of the solution is 4-6:1, H 2 SO 4 The mass fraction of the solution is 40-60%, H 2 O 2 The mass fraction of the solution is 20-30%.
3. The method according to claim 1, wherein in the step (2), the mass ratio of the activated basalt fiber to the vinyl silane coupling agent solution is 10-15:100, and the mass fraction of the vinyl silane coupling agent solution is 2-4%.
4. The method according to claim 1, wherein in the step (2), the vinyl silane coupling agent is a vinyl trimethoxy silane coupling agent, a vinyl triethoxy silane coupling agent or a vinyl trichlorosilane coupling agent.
5. The method according to claim 1, wherein in the step (3), the mass ratio of the vinyl silane coupling agent modified basalt fiber, acrylic acid, acrylamide, N-methylenebisacrylamide and potassium persulfate is 2-4:5-10:5-10:0.05-0.1:0.4-0.8.
6. The process according to claim 1, wherein in the step (3), the polymerization temperature is 60 to 80℃and the polymerization time is 3 to 5 hours.
7. The method according to claim 1, wherein in the step (4), the reaction temperature is 50 to 70℃and the reaction time is 4 to 6 hours.
8. The ultra-high performance concrete with low shrinkage prepared by the preparation method according to any one of claims 1 to 7.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109369118A (en) * | 2018-12-31 | 2019-02-22 | 成都市水泷头化工科技有限公司 | A kind of low shrink(LS) ultra-high performance concrete and preparation method |
| CN112939499A (en) * | 2021-01-29 | 2021-06-11 | 南京工业大学 | Preparation method and application of modified silica fume material |
| CN113912358A (en) * | 2021-11-29 | 2022-01-11 | 山东港基建设集团有限公司 | Ultra-high performance concrete for large-span beam construction and preparation method thereof |
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| KR102255042B1 (en) * | 2020-11-03 | 2021-05-24 | 한국건설기술연구원 | Ultra High Density Concrete, Manufacturing Method of such Concrete, Concrete Member made by such Concrete, and Manufacturing Method of such Concrete Member |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109369118A (en) * | 2018-12-31 | 2019-02-22 | 成都市水泷头化工科技有限公司 | A kind of low shrink(LS) ultra-high performance concrete and preparation method |
| CN112939499A (en) * | 2021-01-29 | 2021-06-11 | 南京工业大学 | Preparation method and application of modified silica fume material |
| CN113912358A (en) * | 2021-11-29 | 2022-01-11 | 山东港基建设集团有限公司 | Ultra-high performance concrete for large-span beam construction and preparation method thereof |
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