CN117088665A - Preparation method of high-performance concrete containing superfine sand - Google Patents
Preparation method of high-performance concrete containing superfine sand Download PDFInfo
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- CN117088665A CN117088665A CN202311353845.4A CN202311353845A CN117088665A CN 117088665 A CN117088665 A CN 117088665A CN 202311353845 A CN202311353845 A CN 202311353845A CN 117088665 A CN117088665 A CN 117088665A
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- 239000004576 sand Substances 0.000 title claims abstract description 48
- 239000004574 high-performance concrete Substances 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 29
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 54
- 239000001913 cellulose Substances 0.000 claims abstract description 35
- 229920002678 cellulose Polymers 0.000 claims abstract description 35
- 239000000839 emulsion Substances 0.000 claims abstract description 33
- 238000013016 damping Methods 0.000 claims abstract description 30
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 24
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 20
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical group C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000002994 raw material Substances 0.000 claims abstract description 17
- -1 silane modified silicon dioxide Chemical class 0.000 claims abstract description 15
- 229920001909 styrene-acrylic polymer Polymers 0.000 claims abstract description 14
- 239000011398 Portland cement Substances 0.000 claims abstract description 11
- 239000013530 defoamer Substances 0.000 claims abstract description 11
- 239000000701 coagulant Substances 0.000 claims abstract description 6
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 67
- 238000003756 stirring Methods 0.000 claims description 47
- 235000010980 cellulose Nutrition 0.000 claims description 34
- 238000002156 mixing Methods 0.000 claims description 32
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 28
- 239000004917 carbon fiber Substances 0.000 claims description 28
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 21
- 238000005406 washing Methods 0.000 claims description 19
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 18
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 claims description 18
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims description 18
- 238000010438 heat treatment Methods 0.000 claims description 18
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 14
- 239000008367 deionised water Substances 0.000 claims description 14
- 229910021641 deionized water Inorganic materials 0.000 claims description 14
- 239000003607 modifier Substances 0.000 claims description 14
- 239000000843 powder Substances 0.000 claims description 14
- 239000002159 nanocrystal Substances 0.000 claims description 13
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 13
- VHYFNPMBLIVWCW-UHFFFAOYSA-N 4-Dimethylaminopyridine Chemical compound CN(C)C1=CC=NC=C1 VHYFNPMBLIVWCW-UHFFFAOYSA-N 0.000 claims description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 12
- 239000012065 filter cake Substances 0.000 claims description 12
- JWVCLYRUEFBMGU-UHFFFAOYSA-N quinazoline Chemical compound N1=CN=CC2=CC=CC=C21 JWVCLYRUEFBMGU-UHFFFAOYSA-N 0.000 claims description 12
- JOXIMZWYDAKGHI-UHFFFAOYSA-N toluene-4-sulfonic acid Chemical compound CC1=CC=C(S(O)(=O)=O)C=C1 JOXIMZWYDAKGHI-UHFFFAOYSA-N 0.000 claims description 12
- 239000000243 solution Substances 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 9
- 238000002390 rotary evaporation Methods 0.000 claims description 9
- 238000000967 suction filtration Methods 0.000 claims description 9
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims description 8
- 239000010881 fly ash Substances 0.000 claims description 8
- UHCUBOJGMLASBY-UHFFFAOYSA-N 2-(chloromethyl)-4-methylquinazoline Chemical compound C1=CC=C2C(C)=NC(CCl)=NC2=C1 UHCUBOJGMLASBY-UHFFFAOYSA-N 0.000 claims description 7
- PXHIYFMTRHEUHZ-UHFFFAOYSA-N 5-hydroxy-2-benzofuran-1,3-dione Chemical compound OC1=CC=C2C(=O)OC(=O)C2=C1 PXHIYFMTRHEUHZ-UHFFFAOYSA-N 0.000 claims description 7
- 235000019738 Limestone Nutrition 0.000 claims description 7
- 229920000168 Microcrystalline cellulose Polymers 0.000 claims description 7
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 7
- 239000006028 limestone Substances 0.000 claims description 7
- 235000019813 microcrystalline cellulose Nutrition 0.000 claims description 7
- 239000008108 microcrystalline cellulose Substances 0.000 claims description 7
- 229940016286 microcrystalline cellulose Drugs 0.000 claims description 7
- 239000011259 mixed solution Substances 0.000 claims description 7
- 229910017604 nitric acid Inorganic materials 0.000 claims description 7
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 6
- 239000012153 distilled water Substances 0.000 claims description 6
- 239000000706 filtrate Substances 0.000 claims description 6
- 238000004108 freeze drying Methods 0.000 claims description 6
- 230000007935 neutral effect Effects 0.000 claims description 6
- 229910052757 nitrogen Inorganic materials 0.000 claims description 6
- 239000002893 slag Substances 0.000 claims description 6
- 238000006482 condensation reaction Methods 0.000 claims description 4
- 239000000047 product Substances 0.000 claims description 4
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims description 3
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 3
- 238000001816 cooling Methods 0.000 claims description 3
- 238000001035 drying Methods 0.000 claims description 3
- 230000007062 hydrolysis Effects 0.000 claims description 3
- 238000006460 hydrolysis reaction Methods 0.000 claims description 3
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 3
- 239000000376 reactant Substances 0.000 claims description 3
- 238000010992 reflux Methods 0.000 claims description 3
- 239000006228 supernatant Substances 0.000 claims description 3
- 239000000725 suspension Substances 0.000 claims description 3
- ILWRPSCZWQJDMK-UHFFFAOYSA-N triethylazanium;chloride Chemical compound Cl.CCN(CC)CC ILWRPSCZWQJDMK-UHFFFAOYSA-N 0.000 claims description 3
- 238000007336 electrophilic substitution reaction Methods 0.000 claims description 2
- 239000007788 liquid Substances 0.000 claims description 2
- GSNUFIFRDBKVIE-UHFFFAOYSA-N DMF Natural products CC1=CC=C(C)O1 GSNUFIFRDBKVIE-UHFFFAOYSA-N 0.000 claims 1
- 238000007112 amidation reaction Methods 0.000 claims 1
- 238000005886 esterification reaction Methods 0.000 claims 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 41
- 239000004567 concrete Substances 0.000 abstract description 24
- 239000000463 material Substances 0.000 abstract description 13
- 125000002943 quinolinyl group Chemical group N1=C(C=CC2=CC=CC=C12)* 0.000 abstract description 4
- 230000002209 hydrophobic effect Effects 0.000 abstract description 3
- 125000001997 phenyl group Chemical group [H]C1=C([H])C([H])=C(*)C([H])=C1[H] 0.000 abstract description 3
- 229910000077 silane Inorganic materials 0.000 abstract description 3
- 238000013329 compounding Methods 0.000 abstract description 2
- 238000000746 purification Methods 0.000 abstract 1
- 230000000052 comparative effect Effects 0.000 description 9
- 239000004575 stone Substances 0.000 description 8
- 239000004721 Polyphenylene oxide Substances 0.000 description 7
- 239000004568 cement Substances 0.000 description 7
- 229920000570 polyether Polymers 0.000 description 7
- 238000012360 testing method Methods 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 230000002708 enhancing effect Effects 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- AEQDJSLRWYMAQI-UHFFFAOYSA-N 2,3,9,10-tetramethoxy-6,8,13,13a-tetrahydro-5H-isoquinolino[2,1-b]isoquinoline Chemical compound C1CN2CC(C(=C(OC)C=C3)OC)=C3CC2C2=C1C=C(OC)C(OC)=C2 AEQDJSLRWYMAQI-UHFFFAOYSA-N 0.000 description 3
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 3
- 229910021538 borax Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 3
- XGZVUEUWXADBQD-UHFFFAOYSA-L lithium carbonate Chemical compound [Li+].[Li+].[O-]C([O-])=O XGZVUEUWXADBQD-UHFFFAOYSA-L 0.000 description 3
- 229910052808 lithium carbonate Inorganic materials 0.000 description 3
- INHCSSUBVCNVSK-UHFFFAOYSA-L lithium sulfate Inorganic materials [Li+].[Li+].[O-]S([O-])(=O)=O INHCSSUBVCNVSK-UHFFFAOYSA-L 0.000 description 3
- 239000001509 sodium citrate Substances 0.000 description 3
- NLJMYIDDQXHKNR-UHFFFAOYSA-K sodium citrate Chemical compound O.O.[Na+].[Na+].[Na+].[O-]C(=O)CC(O)(CC([O-])=O)C([O-])=O NLJMYIDDQXHKNR-UHFFFAOYSA-K 0.000 description 3
- 239000000176 sodium gluconate Substances 0.000 description 3
- 229940005574 sodium gluconate Drugs 0.000 description 3
- 235000012207 sodium gluconate Nutrition 0.000 description 3
- 239000004328 sodium tetraborate Substances 0.000 description 3
- 235000010339 sodium tetraborate Nutrition 0.000 description 3
- 239000002904 solvent Substances 0.000 description 3
- RBTVSNLYYIMMKS-UHFFFAOYSA-N tert-butyl 3-aminoazetidine-1-carboxylate;hydrochloride Chemical compound Cl.CC(C)(C)OC(=O)N1CC(N)C1 RBTVSNLYYIMMKS-UHFFFAOYSA-N 0.000 description 3
- 238000010998 test method Methods 0.000 description 3
- QOSSAOTZNIDXMA-UHFFFAOYSA-N Dicylcohexylcarbodiimide Chemical compound C1CCCCC1N=C=NC1CCCCC1 QOSSAOTZNIDXMA-UHFFFAOYSA-N 0.000 description 2
- 239000002518 antifoaming agent Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 125000003178 carboxy group Chemical group [H]OC(*)=O 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 239000012024 dehydrating agents Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 238000005411 Van der Waals force Methods 0.000 description 1
- 238000005903 acid hydrolysis reaction Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 150000008064 anhydrides Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 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
- 238000004364 calculation method Methods 0.000 description 1
- 150000003841 chloride salts Chemical class 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 125000001309 chloro group Chemical group Cl* 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000007863 gel particle Substances 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000010755 mineral Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 125000002924 primary amino group Chemical group [H]N([H])* 0.000 description 1
- 238000007142 ring opening reaction Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 235000011083 sodium citrates Nutrition 0.000 description 1
- 238000011895 specific detection Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000011374 ultra-high-performance concrete Substances 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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
- C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08B—POLYSACCHARIDES; DERIVATIVES THEREOF
- C08B15/00—Preparation of other cellulose derivatives or modified cellulose, e.g. complexes
- C08B15/05—Derivatives containing elements other than carbon, hydrogen, oxygen, halogens or sulfur
-
- 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)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Structural Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a preparation method of high-performance concrete containing superfine sand, which belongs to the technical field of material purification processing and comprises the following steps: step S1, preparing the following raw materials in parts by weight: 50-65 parts of Portland cement, 68-90 parts of fine aggregate, 150-200 parts of coarse aggregate, 9-13 parts of active admixture, 0.6-0.7 part of water reducer, 0.1-0.3 part of defoamer, 0.06-0.3 part of coagulant, 12.5-18.5 parts of damping emulsion, 15-25 parts of shrink-resistant reinforcing component and 0.08-0.4 part of retarder; s2, preparing concrete; the invention adds the shrink-resistant reinforcing component and the damping emulsion, the shrink-resistant reinforcing component contains the carbon nanofiber structure, the quinoline ring, the benzene ring and the cellulose structure, the damping emulsion is prepared by compounding the hydrophobic silane modified silicon dioxide and the styrene-acrylic emulsion, and the shrink resistance, the durability and the damping performance of the concrete are improved through the combined action of the hydrophobic silane modified silicon dioxide and the styrene-acrylic emulsion.
Description
Technical Field
The invention relates to the field of building materials, in particular to a preparation method of high-performance concrete containing superfine sand.
Background
The high-performance concrete is low-water-cement-ratio concrete prepared by mixing high-quality raw materials with proper amounts of mineral admixture and high-efficiency water reducer and the like, and has the characteristics of high strength, good fluidity, excellent durability and the like.
The common fine aggregate of the high-performance concrete is medium coarse sand, but the price of the building sand is always high, the price is low, and the extra fine sand with rich resource reserves is a focus of attention. The concrete strength is relatively reduced compared to medium sand, and at the same time, due to the relatively high content of aluminum in the extra fine sand, the damping performance of the concrete is reduced. Meanwhile, different from common concrete, the high-performance concrete adopts the means of high cementing material consumption, low water-gel ratio and the like in the design process, which often causes the high-performance concrete to have larger shrinkage problem, thereby causing the concrete to crack prematurely, leading the concrete to be more easily eroded by potential aggressive substances (sulfate, chloride salt, carbonate and the like), and seriously reducing the durability of the concrete. Therefore, the damping performance of the high-performance concrete is improved, the risks of cracking and the like of the cement-based composite material due to self-shrinkage of the high-performance concrete are eliminated, the durability is improved, and the comprehensive service performance of the obtained concrete is ensured.
Disclosure of Invention
The invention aims to provide a preparation method of high-performance concrete containing superfine sand, which aims to solve the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a preparation method of high-performance concrete containing superfine sand comprises the following steps:
step S1, preparing the following raw materials in parts by weight: 50-65 parts of Portland cement, 68-90 parts of fine aggregate, 150-200 parts of coarse aggregate, 9-13 parts of active admixture, 0.6-0.7 part of water reducer, 0.1-0.3 part of defoamer, 0.06-0.3 part of coagulant, 12.5-18.5 parts of damping emulsion, 15-25 parts of shrink-resistant reinforcing component and 0.08-0.4 part of retarder;
step S2, concrete preparation: sequentially adding the weighed Portland cement, the fine aggregate, the coarse aggregate, the active admixture and the damping emulsion into a forced stirrer, stirring and mixing uniformly, adding the shrinkage-resistant reinforcing component, continuing stirring and mixing, adding the water reducer, the defoamer and the coagulant, adding the weighed mixing water while stirring, and continuing stirring for 8-12min to obtain the high-performance concrete containing superfine sand.
Further, the water-material ratio is 0.3-0.32.
Further, the damping emulsion is prepared from modified silica sol and styrene-acrylic emulsion according to the volume ratio of 10-15: 45.
Further, the preparation method of the modified silica sol comprises the following steps:
adding tetraethoxysilane and absolute ethyl alcohol into a reaction kettle, heating to 30 ℃, dropwise adding ammonia water with the mass fraction of 25% while stirring to adjust the pH value to 8.5-9.5, reacting for 2 hours after the dropwise adding, adding KH-560, heating to 50 ℃, stirring and reacting for 4-6 hours, and cooling to room temperature to obtain modified silica sol, wherein the dosage ratio of tetraethoxysilane, absolute ethyl alcohol and KH-560 is 15-18mL:6.7-7.7mL:11.5-12.5mL, and hydrolysis and condensation reaction are carried out by taking tetraethoxysilane as a precursor under alkaline condition to obtain the modified silica sol.
Further, the solid content of the styrene-acrylic emulsion is 51% and the pH is 8-9.
Further, the active admixture is prepared from limestone powder, fly ash and slag powder according to the mixing ratio of 20:15: 15.
Further, the limestone powder is Jiangxi limestone powder, the calcium content is more than or equal to 70 percent, and the specific surface area is 650m 2 /kg。
Further, the fly ash is class II fly ash, and the performance indexes of the fly ash meet the standard requirements, and the 28d activity index is 81%.
Further, the slag powder is of grade S95, the specific surface area is 392m2/kg, and the 28d compressive strength ratio is 98%.
Further, the fine aggregate is superfine sand and machine-made sand, and the mass ratio of the fine aggregate to the machine-made sand is 2:5, mixing.
Further, the coarse aggregate is crushed stone with the grading of 5-10mm and crushed stone with the grading of 10-20mm according to the mass ratio of 3:7, mixing.
Further, the fineness modulus of the machine-made sand is 2.6-3.0.
Wherein, the active admixture can react with calcium hydroxide generated by cement hydration rapidly, promote the formation of hydration gel and fill micro pores so as to improve the shrinkage resistance of the coating.
Furthermore, the water reducer is KL-3 standard type polycarboxylic acid high-performance water reducer produced by a certain water reducer factory in China, and the water reducing rate is 30%.
Further, the defoaming agent is a polyether defoaming agent, the viscosity is 1200 mPa.s, and the molecular weight is 3900.
Further, the coagulant is one or more of lithium carbonate, lithium sulfate and aluminum sulfate mixed according to any ratio.
Further, the retarder is one or more of borax, sodium gluconate and sodium citrate which are mixed according to any ratio.
Further, the preparation method of the shrink-resistant reinforcing component comprises the following steps:
step A1, placing carbon fibers in acetone, stirring for 12 hours at 50 ℃, taking out, washing for 3-5 times by using absolute ethyl alcohol to obtain pretreated carbon fibers, placing the pretreated carbon fibers in 65% by mass of concentrated nitric acid, stirring for 2-3 hours at 90 ℃, filtering, washing a filter cake by deionized water until a washing solution is neutral to obtain acidified carbon fibers, wherein the dosage ratio of the carbon fibers to the acetone is 5g:50mL of pretreated carbon fiber and concentrated nitric acid in an amount ratio of 4g:45-55mL, washing with acetone to remove impurities on the surface of the carbon fiber, and then oxidizing with concentrated nitric acid to increase oxygen-containing groups on the surface of the carbon fiber;
step A2, uniformly mixing the acidified carbon fiber, the carboxylated cellulose nanocrystalline, the p-toluenesulfonic acid and anhydrous DMF, heating to 65-75 ℃ under nitrogen atmosphere, stirring and reacting for 6-8h, standing for 4-6h after the reaction is finished, carrying out suction filtration, respectively washing a filter cake with absolute ethyl alcohol and deionized water for 3-5 times, and freeze-drying to obtain an anti-shrinkage reinforcing component, wherein the dosage ratio of the acidified carbon fiber to the carboxylated cellulose nanocrystalline to the p-toluenesulfonic acid to the anhydrous DMF is 2.5-3.5g:1.2-1.6g:0.01g:55-65mL, using anhydrous DMF as solvent and p-toluenesulfonic acid as catalyst, and esterifying hydroxyl on the surface of the acidified carbon fiber with carboxyl on carboxylated silicon dioxide to obtain the shrink-resistant reinforced component.
Further, the preparation method of the carboxylated cellulose nanocrystalline comprises the following steps:
step B1, adding 2-chloromethyl-4-methyl quinazoline, 4-hydroxyphthalic anhydride, triethylamine, anhydrous DMF and toluene into a three-neck flask, introducing nitrogen, heating to reflux for 6-8h, filtering after the reaction is finished, removing DMF by rotary evaporation of filtrate, dissolving a rotary evaporation product in acetone, removing triethylamine hydrochloride by filtration, and removing acetone by rotary evaporation of filtrate to obtain quinazoline-containing cyclic anhydride;
wherein the dosage ratio of the 2-chloromethyl-4-methyl quinazoline, 4-hydroxy phthalic anhydride, triethylamine, DMF and toluene is 7.7-9.3g:6.6-8.4g:8-10mL:100-120mL:6-8mL, the structural formula is as follows:
。
in the reaction process, anhydrous DMF is taken as a solvent, toluene is taken as a dehydrating agent, triethylamine is taken as an acid binding agent, and a chlorine atom on 2-chloromethyl-4-methyl quinazoline and a hydroxyl on 4-hydroxyphthalic anhydride undergo electrophilic substitution reaction to obtain quinazoline-containing cyclic anhydride;
step B2, adding a silane coupling agent KH-550, quinazoline-containing cyclic anhydride, N-dicyclohexylcarbodiimide and 4-dimethylaminopyridine into anhydrous DMF, uniformly dispersing by ultrasonic, heating to 65-75 ℃ under the protection of nitrogen, stirring and reacting for 6-8h, and after the reaction is finished, carrying out suction filtration, respectively washing a filter cake with absolute ethyl alcohol and deionized water for 2-4 times to obtain a modifier, wherein the dosage ratio of KH-550, quinazoline-containing cyclic anhydride, N-dicyclohexylcarbodiimide, 4-dimethylaminopyridine and anhydrous DMF is 6.4-7.6mL:8-10g:5.2-6.4g:3-3.8g:50-60mL, and the structural formula of the modifier is shown as follows:
。
in the reaction process, taking anhydrous DMF as a solvent, 4-dimethylaminopyridine as a catalyst, and N, N-dicyclohexylcarbodiimide as a dehydrating agent, and carrying out ring opening reaction on amino on a silane coupling agent KH-550 and an anhydride ring on quinazoline-containing cyclic anhydride to obtain a modifier;
step B3, ultrasonically dispersing cellulose nanocrystals in anhydrous DMF, dropwise adding a mixed solution c of a modifier and deionized water, controlling the completion of dropwise adding within 30min, heating to 65-75 ℃, continuously stirring for reaction for 4-5h, performing suction filtration after stirring, repeatedly washing a filter cake by using absolute ethyl alcohol and distilled water, and finally drying at 80 ℃ to constant weight to obtain carboxylated cellulose nanocrystals, wherein the dosage ratio of the cellulose nanocrystals to the anhydrous DMF to the mixed solution c is 8g:100-120mL:10-20mL, and the dosage ratio of the modifier to the deionized water in the mixed solution c is 2-4g: and (2) 10-20mL, in the reaction process, enabling hydrolysis products of the silane coupling agent structure in the modifier and hydroxyl groups on the surface of the cellulose nanocrystal to undergo condensation reaction, so as to obtain carboxylated cellulose nanocrystal with the surface rich in carboxyl and amide bonds.
Further, the preparation method of the cellulose nanocrystalline comprises the following steps:
uniformly mixing microcrystalline cellulose and a sulfuric acid solution with the mass fraction of 64%, stirring for 2 hours at 55 ℃, adding distilled water to stop the reaction, standing for 4-6 hours, pouring out supernatant after the reactant is precipitated, centrifugally dialyzing the residual suspension to be neutral, and freeze-drying at-45 ℃ to obtain cellulose nanocrystalline, wherein the solid-to-liquid ratio of the microcrystalline cellulose to the sulfuric acid solution is 1g:13-15mL; microcrystalline cellulose is used as a raw material, and cellulose nanocrystalline is prepared by a sulfuric acid hydrolysis method.
Further, the superfine sand is natural superfine powder sand in Kenneya, the fineness modulus is 1.0, and the mud content is 1.9%.
Compared with the prior art, the invention has the following beneficial effects: in order to enhance the shrinkage resistance, durability and damping performance of the ultra-high performance concrete, firstly, the shrinkage resistance enhancing component is added into the concrete raw material, the component contains a carbon nanofiber structure, a quinoline ring, a benzene ring and a cellulose structure, the existence of the carbon nanofiber structure can not only enhance the compressive strength of the concrete through the self enhancing and toughening effect, but also enable the crack initiation to require larger external force effect, delay the crack formation and further enhance the shrinkage resistance, the existence of the quinoline ring and the rigid benzene ring can jointly enhance the compressive strength of the concrete, and on the other hand, the quinoline ring can also form a stable structure with inorganic salts of the concrete through the interaction of ionic bonds, hydrogen bonds, van der Waals forces and the like, the durability and damping performance of the concrete are further improved, the cellulose structure can form internal curing in the cement paste, the self-shrinkage of the concrete is further reduced, the damping emulsion is added, the damping emulsion is prepared by compounding hydrophobic silane modified silicon dioxide and styrene-acrylic emulsion, the bleeding of extra fine sand is reduced, meanwhile, the silicon dioxide can be based on the high strength and high toughness of the silicon dioxide, the compressive strength of the concrete is improved, and the silicon dioxide can also play a role of a core through gaps of a C-S-H gel structure, is tightly combined with C-S-H gel particles, the durability of the concrete is further improved, the styrene-acrylic emulsion contains high-damping water, and meanwhile, vibration energy can be dissipated by deformation, sliding and torsion of a molecular chain of the styrene-acrylic emulsion, so that the damping performance of the concrete is further improved.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. The cement used in the examples of the present invention was p.o42.5 cement produced by shandong shanshui cement group limited, and the physical properties of the cement are shown in table 1 below:
TABLE 1
。
Embodiment 1, preferred, this embodiment provides a method for preparing a modified silica sol, comprising the steps of:
adding 16.5mL of tetraethoxysilane and 7.2mL of absolute ethyl alcohol into a reaction kettle, heating to 30 ℃, dropwise adding ammonia water with the mass fraction of 25% while stirring to adjust the pH value to 9.0, reacting for 2 hours after the dropwise adding is finished, adding 12.OmL KH-560, heating to 50 ℃, stirring to react for 5 hours, and cooling to room temperature to obtain the modified silica sol.
Embodiment 2, preferred, this embodiment provides a method for preparing cellulose nanocrystals, comprising the steps of:
uniformly mixing 1g of microcrystalline cellulose and 14mL of sulfuric acid solution with the mass fraction of 64%, stirring for 2 hours at 55 ℃, adding distilled water to stop the reaction, standing for 5 hours, pouring out supernatant after the reactant is precipitated, centrifugally dialyzing the residual suspension to be neutral, and freeze-drying at-45 ℃ to obtain cellulose nanocrystalline.
Embodiment 3, preferred, this embodiment provides a method for preparing carboxylated cellulose nanocrystals, comprising the steps of:
step B1, adding 8.5g of 2-chloromethyl-4-methyl quinazoline, 7.5g of 4-hydroxyphthalic anhydride, 9mL of triethylamine, 110mL of anhydrous DMF and 7mL of toluene into a three-neck flask, introducing nitrogen, heating to reflux for 7h, filtering after the reaction is finished, performing rotary evaporation on the filtrate to remove DMF, dissolving the rotary evaporation product in acetone, performing filtration to remove triethylamine hydrochloride, and performing rotary evaporation on the filtrate to remove acetone to obtain quinazoline-containing cyclic anhydride;
step B2, adding 7mL of silane coupling agent KH-550, 9g of quinazoline-containing cyclic anhydride, 5.8g of N, N-dicyclohexylcarbodiimide and 3.4g of 4-dimethylaminopyridine into 55mL of anhydrous DMF, uniformly dispersing by ultrasonic, heating to 70 ℃ under the protection of nitrogen, stirring for reaction for 7 hours, and after the reaction is finished, performing suction filtration, and respectively washing a filter cake with absolute ethyl alcohol and deionized water for 3 times to obtain a modifier;
and B3, dispersing 8g of the cellulose nanocrystalline prepared in the embodiment 2 in 110mL of anhydrous DMF (dimethyl formamide) by ultrasonic, dripping 3g of a mixed solution c of a modifier and 15mL of deionized water, controlling the dripping within 30min, heating to 70 ℃ after dripping, continuously stirring for reacting for 4.5h, carrying out suction filtration after stirring is finished, repeatedly washing a filter cake by using absolute ethyl alcohol and distilled water, and finally drying at 80 ℃ to constant weight to obtain the carboxylated cellulose nanocrystalline.
Embodiment 4, preferred, this embodiment provides a method for preparing a shrink-resistant reinforcing component, comprising the steps of:
step A1, placing 5g of carbon fiber in 50mL of acetone, stirring for 12 hours at 50 ℃, taking out, washing for 4 times by using absolute ethyl alcohol to obtain pretreated carbon fiber, placing 4g of pretreated carbon fiber in 50mL of 65% mass fraction concentrated nitric acid, stirring for 2.5 hours at 90 ℃, filtering, washing a filter cake by using deionized water until a washing solution is neutral, and obtaining acidified carbon fiber;
and A2, uniformly mixing 3g of acidified carbon fiber, 1.4g of carboxylated cellulose nanocrystalline prepared in the embodiment 3, 0.01g of p-toluenesulfonic acid and 60mL of anhydrous DMF, heating to 70 ℃ under nitrogen atmosphere, stirring and reacting for 7h, standing for 5h after the reaction is finished, carrying out suction filtration, respectively washing a filter cake with anhydrous ethanol and deionized water for 4 times, and freeze-drying to obtain the shrink-resistant reinforced component.
Example 5, this example provides a method for preparing high performance concrete containing extra fine sand, comprising the steps of:
step S1, preparing the following raw materials in parts by weight: 50 parts of Portland cement, 68 parts of fine aggregate, 150 parts of coarse aggregate, 9 parts of active admixture, 0.6 part of water reducer, 0.1 part of polyether defoamer, 0.06 part of lithium carbonate, 12.5 parts of damping emulsion, 15 parts of shrinkage-resistance reinforcing component prepared in example 4 and 0.08 part of borax, wherein the fine aggregate is superfine sand prepared in example 1 and machine-made sand with fineness modulus of 2.6-3.0 according to mass ratio of 2:5, mixing, wherein the coarse aggregate is crushed stone with the grading of 5-10mm and crushed stone with the grading of 10-20mm according to the mass ratio of 3:7, mixing the active admixture with limestone powder, fly ash and slag powder according to the mixing ratio of 20:15:15, wherein the water reducer is KL-3 standard type polycarboxylic acid high-performance water reducer produced by a certain water reducer factory in China, the water reducing rate is 30%, and the damping emulsion is prepared from modified silica sol and styrene-acrylic emulsion prepared in example 1 according to the volume ratio of 10:45, wherein the solid content of the styrene-acrylic emulsion is 51% and the pH value is 8;
step S2, concrete preparation: sequentially adding the weighed Portland cement, the fine aggregate, the coarse aggregate and the active admixture into a forced mixer, uniformly stirring and mixing, adding the shrinkage-resistant reinforcing component, continuously stirring and mixing, adding the water reducer, the polyether defoamer, the lithium carbonate and the borax, adding the weighed mixed water while stirring, and continuously stirring for 8min to obtain the high-performance concrete containing superfine sand, wherein the water-material ratio in the high-performance concrete is 0.3.
Example 6, this example provides a method for preparing high performance concrete containing extra fine sand, comprising the steps of:
step S1, preparing the following raw materials in parts by weight: 57.5 parts of Portland cement, 79 parts of fine aggregate, 175 parts of coarse aggregate, 11 parts of active admixture, 0.65 part of water reducer, 0.2 part of polyether defoamer, 0.18 part of lithium sulfate, 15.5 parts of damping emulsion, 20 parts of shrinkage-resistance reinforcing component prepared in example 4 and 0.24 part of sodium gluconate, wherein the fine aggregate is extra fine sand prepared in example 1 and machine-made sand with fineness modulus of 2.6-3.0 according to mass ratio of 2:5, mixing, wherein the coarse aggregate is crushed stone with the grading of 5-10mm and crushed stone with the grading of 10-20mm according to the mass ratio of 3:7, mixing the active admixture with limestone powder, fly ash and slag powder according to the mixing ratio of 20:15:15, wherein the water reducer is KL-3 standard type polycarboxylic acid high-performance water reducer produced by a certain water reducer factory in China, the water reducing rate is 30%, and the damping emulsion is prepared from modified silica sol and styrene-acrylic emulsion prepared in example 1 according to the volume ratio of 12.5:45, wherein the solid content of the styrene-acrylic emulsion is 51% and the pH value is 8.5;
step S2, concrete preparation: sequentially adding the weighed Portland cement, the fine aggregate, the coarse aggregate and the active admixture into a forced mixer, uniformly stirring and mixing, adding the shrinkage-resistant reinforcing component, continuously stirring and mixing, adding the water reducer, the polyether defoamer, the lithium sulfate and the sodium gluconate, stirring while adding the weighed mixed water, and continuously stirring for 10min to obtain the high-performance concrete containing superfine sand, wherein the water-material ratio in the high-performance concrete is 0.31.
Example 7, this example provides a method for preparing high performance concrete containing extra fine sand, comprising the steps of:
step S1, preparing the following raw materials in parts by weight: 65 parts of Portland cement, 90 parts of fine aggregate, 200 parts of coarse aggregate, 13 parts of active admixture, 0.7 part of water reducer, 0.3 part of polyether defoamer, 0.3 part of aluminum sulfate, 18.5 parts of damping emulsion, 25 parts of shrinkage-resistance reinforcing component prepared in example 4 and 0.4 part of sodium citrate, wherein the fine aggregate is superfine sand prepared in example 1 and machine-made sand with fineness modulus of 2.6-3.0 according to mass ratio of 2:5, mixing, wherein the coarse aggregate is crushed stone with the grading of 5-10mm and crushed stone with the grading of 10-20mm according to the mass ratio of 3:7, mixing the active admixture with limestone powder, fly ash and slag powder according to the mixing ratio of 20:15:15, wherein the water reducer is KL-3 standard type polycarboxylic acid high-performance water reducer produced by a certain water reducer factory in China, the water reducing rate is 30%, and the damping emulsion is prepared from modified silica sol and styrene-acrylic emulsion prepared in example 1 according to the volume ratio of 15:45, wherein the solid content of the styrene-acrylic emulsion is 51% and the pH value is 9;
step S2, concrete preparation: sequentially adding the weighed Portland cement, the fine aggregate, the coarse aggregate and the active admixture into a forced mixer, uniformly stirring and mixing, adding the shrinkage-resistant reinforcing component, continuously stirring and mixing, adding the water reducer, the polyether defoamer, the aluminum sulfate and the sodium citrate, adding the weighed mixed water while stirring, and continuously stirring for 12min to obtain the high-performance concrete containing superfine sand, wherein the water-material ratio in the high-performance concrete is 0.32.
Comparative example 1
The ethyl orthosilicate in example 1 was removed, the remaining raw materials and the preparation process were kept unchanged, and the prepared material was replaced with the damping emulsion in example 6, and the remaining raw materials and the preparation process were kept unchanged.
Comparative example 2
The modifier in example 3 was removed, the remaining raw materials and the preparation process were kept unchanged, the prepared material was replaced with carboxylated cellulose nanocrystals in example 4, the remaining raw materials and the preparation process were kept unchanged, and the prepared material was replaced with the shrink-resistant reinforcing component in example 6, the remaining raw materials and the preparation process were kept unchanged.
Comparative example 3
The cellulose nanocrystals in example 3 were removed, the remaining raw materials and preparation process remained unchanged, the prepared material was replaced with carboxylated cellulose nanocrystals in example 4, the remaining raw materials and preparation process remained unchanged, and the prepared material was replaced with the shrink-resistant enhancing component in example 6, the remaining raw materials and preparation process remained unchanged.
Comparative example 4
The shrink-resistant enhancing component of example 6 was removed and the remaining materials and preparation process remained unchanged.
Comparative example 5
The damping emulsion of example 6 was removed and the remaining materials and preparation process remained unchanged.
Performance detection
1. The high-performance concretes prepared in examples 5 to 7 and comparative examples 1 to 5 were tested, the flexural/compressive strength was measured according to the test method specified in GB/T17671-1999, the dry shrinkage rate of 28d was measured according to the test method specified in JC/T2381-2016, the free expansion rate of 28d was measured according to the test method specified in JC/T313-2009, and performance test data was carried out on the permeation resistance and erosion resistance of the concretes, and the specific test results are shown in Table 2:
TABLE 2
。
As can be seen from the data in Table 2, the high-performance concrete containing extra fine sand obtained in examples 5 to 7 has good shrinkage resistance and compressive strength, and at the same time they have good resistance to permeation and erosion, showing good durability, relative to comparative examples 1 to 5.
2. Fixing one end of the high-performance concrete containing extra fine sand prepared in the embodiment 5-7 and the comparative example 1-5 of curing 28d respectively, applying simple harmonic vibration load to a test piece by using a test force hammer, analyzing vibration by using an INV 3062T-type damping ratio test analysis system, calculating a damping ratio by adopting a half-power bandwidth method, and adopting the calculation formula:
。
wherein, xi is damping ratio, omega １ And omega ２ The frequency is 0.707 times of the resonance peak value, and the frequency is Hz; omega 0 Is the resonant frequency, hz. Each test piece was repeatedly subjected to damping test 3 times, and the results were averaged, and specific detection results are shown in table 3 below:
TABLE 3 Table 3
。
As can be seen from the data in Table 3, the high-performance concrete containing extra fine sand prepared in examples 5 to 7 has good shrinkage resistance and compressive strength, and at the same time, they have good resistance to permeation and erosion, and exhibit good durability, relative to comparative examples 1 to 5.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A preparation method of high-performance concrete containing superfine sand is characterized in that: the method comprises the following steps:
step S1, preparing the following raw materials in parts by weight: 50-65 parts of Portland cement, 68-90 parts of fine aggregate, 150-200 parts of coarse aggregate, 9-13 parts of active admixture, 0.6-0.7 part of water reducer, 0.1-0.3 part of defoamer, 0.06-0.3 part of coagulant, 12.5-18.5 parts of damping emulsion, 15-25 parts of shrink-resistant reinforcing component and 0.08-0.4 part of retarder;
s2, sequentially adding the weighed Portland cement, the fine aggregate, the coarse aggregate, the active admixture and the damping emulsion into a forced mixer, uniformly stirring and mixing, adding the shrinkage-resistant reinforcing component, continuously stirring and mixing, adding the water reducer, the defoamer and the coagulant, stirring, adding the weighed mixed water, and continuously stirring for 8-12min to obtain the high-performance concrete containing superfine sand;
the fine aggregate is superfine sand and machine-made sand, and the mass ratio of the fine aggregate to the machine-made sand is 2:5, mixing;
the damping emulsion is prepared from silica sol modified by KH-570 and styrene-acrylic emulsion according to the volume ratio of 10-15: 45;
the modified silica sol is prepared by hydrolysis and condensation reaction of tetraethoxysilane and KH560 under alkaline condition;
the anti-shrinkage reinforcing component is firstly treated by acetone and absolute ethyl alcohol to obtain pretreated carbon fibers, then oxidized by concentrated nitric acid to obtain acidified carbon fibers, and then esterification reaction is continuously carried out on the acidified carbon fibers and carboxylated cellulose nanocrystals to obtain the anti-shrinkage carbon fibers;
the carboxylated cellulose nanocrystals are prepared by carrying out electrophilic substitution reaction on 2-chloromethyl-4-methyl quinazoline and 4-hydroxyphthalic anhydride to obtain quinazoline-containing cyclic anhydride, then carrying out amidation reaction on the quinazoline-containing cyclic anhydride and a silane coupling agent KH-550 to obtain a modifier, and finally carrying out condensation reaction on the modifier and the cellulose nanocrystals;
the cellulose nanocrystalline is prepared by treating microcrystalline cellulose and sulfuric acid solution and then centrifugally dialyzing.
2. The method for preparing high-performance concrete containing superfine sand according to claim 1, wherein the method comprises the following steps: the preparation method of the modified silica sol comprises the following steps:
adding tetraethoxysilane and absolute ethyl alcohol into a reaction kettle, heating to 30 ℃, dropwise adding ammonia water with mass fraction of 25% while stirring to adjust the pH value to 8.5-9.5, reacting for 2 hours after the dropwise adding, adding KH-560, heating to 50 ℃, stirring and reacting for 4-6 hours, and cooling to room temperature to obtain the modified silica sol.
3. The method for preparing high-performance concrete containing superfine sand according to claim 1, wherein the method comprises the following steps: the preparation method of the shrink-resistant reinforcing component comprises the following steps:
step A1, placing carbon fibers in acetone, stirring for 12 hours at 50 ℃, taking out, washing for 3-5 times by using absolute ethyl alcohol to obtain pretreated carbon fibers, placing the pretreated carbon fibers in 65% by mass of concentrated nitric acid, stirring for 2-3 hours at 90 ℃, filtering, and washing a filter cake by using deionized water until a washing solution is neutral to obtain acidified carbon fibers;
and A2, uniformly mixing the acidified carbon fiber, the carboxylated cellulose nanocrystalline, the p-toluenesulfonic acid and anhydrous DMF, heating to 65-75 ℃ under nitrogen atmosphere, stirring for reaction for 6-8h, standing for 4-6h after the reaction is finished, carrying out suction filtration, respectively washing a filter cake with absolute ethyl alcohol and deionized water for 3-5 times, and freeze-drying to obtain the shrink-resistant reinforcing component.
4. The method for preparing high-performance concrete containing superfine sand according to claim 2, wherein the method comprises the following steps: the preparation method of the carboxylated cellulose nanocrystalline comprises the following steps:
step B1, adding 2-chloromethyl-4-methyl quinazoline, 4-hydroxyphthalic anhydride, triethylamine, anhydrous DMF and toluene into a three-neck flask, introducing nitrogen, heating to reflux for 6-8h, filtering after the reaction is finished, removing DMF by rotary evaporation of filtrate, dissolving a rotary evaporation product in acetone, removing triethylamine hydrochloride by filtration, and removing acetone by rotary evaporation of filtrate to obtain quinazoline-containing cyclic anhydride;
step B2, adding a silane coupling agent KH-550, quinazoline-containing cyclic anhydride, N-dicyclohexylcarbodiimide and 4-dimethylaminopyridine into anhydrous DMF, uniformly dispersing by ultrasonic waves, heating to 65-75 ℃ under the protection of nitrogen, stirring and reacting for 6-8 hours, and after the reaction is finished, carrying out suction filtration, and respectively washing a filter cake with absolute ethyl alcohol and deionized water for 2-4 times to obtain a modifier;
and B3, ultrasonically dispersing the cellulose nanocrystalline in anhydrous DMF, dropwise adding a mixed solution c of a modifier and deionized water, controlling the completion of dropwise adding within 30min, heating to 65-75 ℃, continuously stirring for reacting for 4-5h, performing suction filtration after stirring, repeatedly washing a filter cake with absolute ethyl alcohol and distilled water, and finally drying at 80 ℃ to constant weight to obtain carboxylated cellulose nanocrystalline.
5. A method for preparing high-performance concrete containing superfine sand according to claim 3, characterized in that: the preparation method of the cellulose nanocrystalline comprises the following steps:
uniformly mixing microcrystalline cellulose and a sulfuric acid solution with the mass fraction of 64%, stirring for 2 hours at 55 ℃, adding distilled water to stop the reaction, standing for 4-6 hours, pouring out supernatant after the reactant is precipitated, centrifugally dialyzing the residual suspension to be neutral, and freeze-drying at-45 ℃ to obtain cellulose nanocrystalline.
6. The method for preparing high-performance concrete containing superfine sand according to claim 2, wherein the method comprises the following steps: the dosage ratio of the tetraethoxysilane to the absolute ethyl alcohol to the KH-560 is 15-18mL:6.7-7.7mL:11.5-12.5mL.
7. A method for preparing high-performance concrete containing superfine sand according to claim 3, characterized in that: in the step A1, the dosage ratio of the carbon fiber to the acetone is 5g:50mL of pretreated carbon fiber and concentrated nitric acid in an amount ratio of 4g:45-55mL, in the step A2, the dosage ratio of the acidified carbon fiber, the carboxylated cellulose nanocrystalline, the p-toluenesulfonic acid and the anhydrous DMF is 2.5-3.5g:1.2-1.6g:0.01g:55-65mL.
8. The method for preparing high-performance concrete containing superfine sand according to claim 4, wherein the method comprises the following steps: in the step B1, the dosage ratio of the 2-chloromethyl-4-methyl quinazoline, 4-hydroxyphthalic anhydride, triethylamine, DMF and toluene is 7.7-9.3g:6.6-8.4g:8-10mL:100-120mL:6-8mL, in the step B2, the dosage ratio of KH-550, quinazoline-containing cyclic anhydride, N-dicyclohexylcarbodiimide, 4-dimethylaminopyridine and anhydrous DMF is 6.4-7.6mL, 8-10g, 5.2-6.4g, 3-3.8g and 50-60mL, and in the step B3, the dosage ratio of cellulose nanocrystalline, anhydrous DMF and mixed solution c is 8g:100-120mL:3-5mL, and the dosage ratio of the modifier to the deionized water in the mixed solution c is 2-4g:10-20mL.
9. The method for preparing high-performance concrete containing superfine sand according to claim 5, wherein the method comprises the following steps: the solid-to-liquid ratio of the microcrystalline cellulose and the sulfuric acid solution is 1g:13-15mL.
10. The method for preparing high-performance concrete containing superfine sand according to claim 1, wherein the method comprises the following steps: the active admixture is prepared from limestone powder, fly ash and slag powder according to the mixing ratio of 20:15: 15.
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Application publication date: 20231121 |