CN117819909A - Porous reticular aggregate/carbon fiber composite modified high-temperature-resistant high-strength concrete - Google Patents
Porous reticular aggregate/carbon fiber composite modified high-temperature-resistant high-strength concrete Download PDFInfo
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- CN117819909A CN117819909A CN202311832455.5A CN202311832455A CN117819909A CN 117819909 A CN117819909 A CN 117819909A CN 202311832455 A CN202311832455 A CN 202311832455A CN 117819909 A CN117819909 A CN 117819909A
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- 229920000049 Carbon (fiber) Polymers 0.000 title claims abstract description 133
- 239000004917 carbon fiber Substances 0.000 title claims abstract description 133
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 123
- 239000011372 high-strength concrete Substances 0.000 title claims abstract description 37
- 239000002131 composite material Substances 0.000 title claims abstract description 25
- 239000002699 waste material Substances 0.000 claims abstract description 95
- 239000010881 fly ash Substances 0.000 claims abstract description 47
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000002253 acid Substances 0.000 claims abstract description 13
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 13
- 239000011398 Portland cement Substances 0.000 claims abstract description 11
- 239000002002 slurry Substances 0.000 claims description 36
- 238000001035 drying Methods 0.000 claims description 28
- 238000002360 preparation method Methods 0.000 claims description 27
- 238000003756 stirring Methods 0.000 claims description 27
- 239000000758 substrate Substances 0.000 claims description 27
- 239000002993 sponge (artificial) Substances 0.000 claims description 26
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 22
- 239000006229 carbon black Substances 0.000 claims description 19
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 18
- 238000002791 soaking Methods 0.000 claims description 18
- 238000005507 spraying Methods 0.000 claims description 18
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 16
- 239000000463 material Substances 0.000 claims description 13
- 230000004048 modification Effects 0.000 claims description 12
- 238000012986 modification Methods 0.000 claims description 12
- 230000032683 aging Effects 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 11
- 235000019353 potassium silicate Nutrition 0.000 claims description 10
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 claims description 10
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 238000005520 cutting process Methods 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 9
- 239000006260 foam Substances 0.000 claims description 9
- 238000006722 reduction reaction Methods 0.000 claims description 9
- 238000005245 sintering Methods 0.000 claims description 9
- 235000012239 silicon dioxide Nutrition 0.000 claims description 4
- 239000000377 silicon dioxide Substances 0.000 claims description 4
- 229940008309 acetone / ethanol Drugs 0.000 claims description 2
- 239000003469 silicate cement Substances 0.000 claims description 2
- 150000001721 carbon Chemical class 0.000 abstract description 2
- 239000004567 concrete Substances 0.000 description 22
- 238000002156 mixing Methods 0.000 description 9
- 241000872198 Serjania polyphylla Species 0.000 description 7
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 7
- 230000008878 coupling Effects 0.000 description 7
- 238000010168 coupling process Methods 0.000 description 7
- 238000005859 coupling reaction Methods 0.000 description 7
- 229910000077 silane Inorganic materials 0.000 description 7
- 238000012360 testing method Methods 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000000654 additive Substances 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 239000004568 cement Substances 0.000 description 2
- 229910052681 coesite Inorganic materials 0.000 description 2
- 229910052906 cristobalite Inorganic materials 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052682 stishovite Inorganic materials 0.000 description 2
- 229910052905 tridymite Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 230000013011 mating Effects 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- -1 shale Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000012549 training Methods 0.000 description 1
Classifications
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- 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
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/08—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by adding porous substances
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
-
- 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
- C04B2111/40—Porous or lightweight materials
-
- 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)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention provides porous reticular aggregate/carbon fiber composite modified high-temperature-resistant high-strength concrete, which comprises the following components: 300-400 parts of ordinary Portland cement; 260-320 parts of porous net-shaped lightweight aggregate; 480-560 parts of 0.15-2.5mm fine aggregate; 6-10 parts of polycarboxylic acid high-efficiency water reducer; 8-15 parts of modified waste carbon fiber; 60-80 parts of fly ash; 180-220 parts of water. The invention aims to provide porous reticular aggregate/carbon fiber composite modified high-temperature-resistant high-strength concrete, which adopts a porous reticular structure as a light coarse aggregate and is reinforced by modified carbon fibers, and meanwhile, the mechanical property and the heat resistance are improved.
Description
Technical Field
The invention relates to the field of building materials, in particular to porous reticular aggregate/carbon fiber composite modified high-temperature-resistant high-strength concrete.
Background
Concrete is the most important application form of cement and is one of the most important building materials in the current generation. Because concrete has the outstanding advantages of high strength, wide applicability, durability, good fire resistance, abundant raw material resources, easy production and manufacture, etc., the development of the concrete is rapid in the past hundred years, and the application of the concrete is wide and incomparable with any other material. However, for the last two decades, people no longer meet the existing advantages of concrete, so that the concrete is continuously developed towards the directions of rapid hardening, high strength, light weight, modification, compounding and energy saving, and the application field of the concrete is widened. At present, people can change the cementing materials and the aggregates according to own wishes, or select special manufacturing processes, or blend different types of additives to prepare modified concrete with various properties, such as waterproof and fireproof concrete, and the like.
Lightweight aggregate concrete (also called lightweight aggregate concrete, light Weight Aggregate Concrete) is prepared from lightweight coarse aggregate, lightweight fine aggregate (or normal sand), cement and water, if necessary, with chemical additives and mineral admixtures, and has a dry apparent density of 28d age under standard curing conditions<1950kg/m 3 Is a concrete of the concrete. Lightweight aggregate concrete has many excellent properties compared with ordinary concrete, but its popularization and application have not been as popular as ordinary concrete, and the main reasons are as follows: first, raw material effects. The raw materials used for the lightweight aggregate include swelling clay, shale, fly ash, river silt and the like. Not all places may have such resources; second, the development of the mating technology lags behind. The standard, the construction regulations, the experimental data and the research results which are necessary for the popularization of the lightweight aggregate concrete are not as rich and systematic as those of common concrete, and the large-area popularization of the lightweight aggregate concrete has great restriction: third, the technical precipitation is relatively weak and engineering experience and training are relatively poor.
Disclosure of Invention
The technical problems to be solved are as follows: the invention aims to provide porous reticular aggregate/carbon fiber composite modified high-temperature-resistant high-strength concrete, which adopts a porous reticular structure as a light coarse aggregate and is reinforced by modified carbon fibers, and meanwhile, the mechanical property and the heat resistance are improved.
The technical scheme is as follows: the porous reticular aggregate/carbon fiber composite modified high-temperature-resistant high-strength concrete comprises the following components:
300-400 parts of ordinary Portland cement
260-320 parts of porous net-shaped lightweight aggregate
480-560 parts of 0.15-2.5mm fine aggregate
6-10 parts of polycarboxylic acid high-efficiency water reducer
8-15 parts of modified waste carbon fiber
60-80 parts of fly ash
180-220 parts of water.
Preferably, the preparation method of the porous net-shaped light coarse aggregate comprises the following steps:
s1, preparing a light coarse aggregate base material: the method comprises the steps of selecting a high molecular sponge with an open-cell foam structure as a lightweight aggregate substrate;
s2, preparing slurry: adding the fly ash into water, uniformly dispersing by ultrasonic, adding the fly ash into silica sol containing carbon black, and uniformly stirring to obtain slurry;
s3, preparing prefabricated lightweight coarse aggregate: immersing the substrate into the slurry prepared in the step S2, taking out the lightweight aggregate substrate containing the slurry, and repeating immersing and drying after drying to obtain prefabricated lightweight aggregate;
s4, preparing the light coarse aggregate: and (3) placing the prefabricated lightweight aggregate into a sintering furnace to perform carbothermic reduction reaction under the anaerobic condition to obtain the lightweight aggregate.
Preferably, in the step S1, the porosity of the polymer sponge is 90-95%, the size of the air hole is 1-2mm, and the size of the polymer sponge is 5-20mm by 5-20mm.
Preferably, the concentration of the silica sol in the step S2 is 20-30wt%, the source of the fly ash is a thermal power plant, and the content of the silicon dioxide in the fly ash is 9.6-15.5wt%.
Preferably, in the step S2, the mass ratio of the fly ash to the carbon black to the silica sol is 2-5:10-20:5-10.
Preferably, the heating rate of the carbothermic reaction in the step S4 is 5-10 ℃/min, the carbothermic reaction is heated to 1250-1330 ℃, and the carbothermic reaction is kept for 20-60min.
Preferably, the preparation method of the modified waste carbon fiber comprises the following steps:
s11, cutting the waste carbon fiber to 3-7mm, then soaking the waste carbon fiber in a 40-50% hydrogen peroxide hot solution, stirring and reacting for 60-120min, and filtering to obtain oxidized modified waste carbon fiber;
s12, drying the oxidized and modified waste carbon fiber, spraying a silane coupling agent into the oxidized and modified waste carbon fiber in a vacuum state, pressurizing and stirring uniformly, decompressing, spraying a water glass solution with the concentration of 10-15wt%, aging for 4-6 hours at room temperature, soaking the carbon fiber in the silane coupling agent solution after aging, and carrying out surface modification to obtain the modified waste carbon fiber.
Preferably, the silane coupling agent solution is silane coupling agent G-570/acetone/ethanol solution.
The preparation method of the porous reticular aggregate/carbon fiber composite modified high-temperature-resistant high-strength concrete comprises the following steps: the modified waste carbon fiber and the porous net-shaped lightweight coarse aggregate are uniformly mixed according to the proportion, and then the common silicate cement, the fine aggregate, the polycarboxylic acid high-efficiency water reducer, the fly ash and the water are added according to the proportion to obtain the high-temperature-resistant high-strength concrete.
The beneficial effects are that: the high-temperature-resistant high-strength concrete has the following advantages:
1. according to the invention, a self-made porous reticular filler is adopted as a lightweight aggregate, an open-pore polymer sponge is adopted as a base material, fly ash and silica sol are adsorbed on the surface of the base material, the fly ash contains SiO2, the silica sol contains Si, the carbon black contains C, and SiC can be generated by reaction at a certain temperature, so that the SiC porous reticular lightweight aggregate is prepared;
2. the waste carbon fiber is modified, the surface active groups of the waste carbon fiber are less than those of the carbon fiber, the waste carbon fiber is oxidized, and the waste carbon fiber is modified by using water glass after being modified by using a silane coupling agent to generate porous SiO2 on the surface, so that the heat conduction effect of the carbon fiber can be improved;
3. and mixing the porous reticular lightweight aggregate and the modified waste carbon fiber to reinforce the concrete, so that the high-temperature-resistant high-strength concrete can be obtained.
Detailed Description
The invention is further described below with reference to the following examples, which are illustrative of the invention and are not intended to limit the invention thereto:
example 1
The preparation method of the porous reticular aggregate/carbon fiber composite modified high-temperature-resistant high-strength concrete comprises the following steps:
uniformly mixing 8 parts of modified waste carbon fibers with 260 parts of porous net-shaped lightweight coarse aggregate, and then adding 300 parts of ordinary Portland cement, 480 parts of fine aggregate, 6 parts of polycarboxylic acid high-efficiency water reducer, 60 parts of fly ash and 180 parts of water according to a proportion to obtain high-temperature-resistant high-strength concrete;
the preparation method of the porous reticular light coarse aggregate comprises the following steps:
s1, preparing a light coarse aggregate base material: the polymer sponge with an open-cell foam structure is selected as a lightweight aggregate substrate, the average porosity of the polymer sponge is 90.5 percent, the size of the air hole is 1.2mm, the size of the polymer sponge is 5-20mm, wherein the ratio of 5-8mm is 41.2%, the ratio of 8-12mm is 32.5%,12-16mm by 12.1%,16-20mm by the balance;
s2, preparing slurry: adding the fly ash into water, uniformly dispersing by ultrasonic, adding the fly ash into silica sol containing carbon black with the concentration of 20wt%, and uniformly stirring to obtain slurry, wherein the mass ratio of the fly ash to the carbon black to the silica sol is 2:10:5;
s3, preparing prefabricated lightweight coarse aggregate: immersing the substrate into the slurry prepared in the step S2, taking out the lightweight aggregate substrate containing the slurry, and repeating immersing and drying after drying to obtain prefabricated lightweight aggregate;
s4, preparing the light coarse aggregate: placing the prefabricated lightweight aggregate into a sintering furnace to perform carbothermic reduction reaction under the anaerobic condition, heating to 1250 ℃ at a heating rate of 5 ℃/min, and preserving heat for 20min to obtain the lightweight aggregate;
the preparation method of the modified waste carbon fiber comprises the following steps:
s11, cutting the waste carbon fiber to 3mm, then soaking the waste carbon fiber in a 40% hydrogen peroxide hot solution, stirring and reacting for 60min, and filtering to obtain oxidized modified waste carbon fiber;
s12, drying the oxidized and modified waste carbon fiber, spraying a silane coupling agent-trimethylhydroxysilane into the oxidized and modified waste carbon fiber in a vacuum state, pressurizing and uniformly stirring the oxidized and modified waste carbon fiber, releasing pressure, spraying a water glass solution with the concentration of 10wt%, aging the oxidized and modified waste carbon fiber at room temperature for 6 hours, soaking the carbon fiber in the silane coupling agent G-570 solution, and carrying out surface modification to obtain the modified waste carbon fiber.
Example 2
The preparation method of the porous reticular aggregate/carbon fiber composite modified high-temperature-resistant high-strength concrete comprises the following steps:
uniformly mixing 15 parts of modified waste carbon fibers with 320 parts of porous net-shaped lightweight coarse aggregate, then adding 400 parts of ordinary Portland cement, 560 parts of fine aggregate, 10 parts of polycarboxylic acid high-efficiency water reducer, 80 parts of fly ash and 220 parts of water according to a proportion to obtain high-temperature-resistant high-strength concrete;
the preparation method of the porous reticular light coarse aggregate comprises the following steps:
s1, preparing a light coarse aggregate base material: the method comprises the steps of selecting a polymer sponge with an open-cell foam structure as a lightweight aggregate substrate, wherein the average porosity of the polymer sponge is 92.3%, the size of an air hole is 2mm, and the size of the polymer sponge is 5-20mm; wherein the ratio of 5-8mm is 28.2%, the ratio of 8-12mm is 40.5%, the ratio of 12-16mm by 12-16mm is 11.1%, and the ratio of 16-20mm by 16-20mm is the rest
S2, preparing slurry: adding the fly ash into water, uniformly dispersing by ultrasonic, adding the fly ash into silica sol containing carbon black with the concentration of 30wt%, and uniformly stirring to obtain slurry, wherein the mass ratio of the fly ash to the carbon black to the silica sol is 5:20:10;
s3, preparing prefabricated lightweight coarse aggregate: immersing the substrate into the slurry prepared in the step S2, taking out the lightweight aggregate substrate containing the slurry, and repeating immersing and drying after drying to obtain prefabricated lightweight aggregate;
s4, preparing the light coarse aggregate: placing the prefabricated lightweight aggregate into a sintering furnace to perform carbothermic reduction reaction under the anaerobic condition, heating to 1330 ℃ at the reaction heating rate of 10 ℃/min, and preserving heat for 60min to obtain the lightweight aggregate;
the preparation method of the modified waste carbon fiber comprises the following steps:
s11, cutting the waste carbon fiber to 7mm, then soaking the waste carbon fiber in a hydrogen peroxide hot solution with the concentration of 50%, stirring and reacting for 120min, and filtering to obtain oxidized modified waste carbon fiber;
s12, drying the oxidized and modified waste carbon fiber, spraying a silane coupling agent-trimethylhydroxysilane into the oxidized and modified waste carbon fiber in a vacuum state, pressurizing and uniformly stirring the oxidized and modified waste carbon fiber, releasing pressure, spraying water glass solution with the concentration of 15wt%, aging the oxidized and modified waste carbon fiber for 4 hours at room temperature, and soaking the carbon fiber in the silane coupling agent G-570 solution for surface modification to obtain the modified waste carbon fiber.
Example 3
The preparation method of the porous reticular aggregate/carbon fiber composite modified high-temperature-resistant high-strength concrete comprises the following steps:
uniformly mixing 10 parts of modified waste carbon fibers with 280 parts of porous net-shaped lightweight coarse aggregate, then adding 330 parts of ordinary Portland cement, 500 parts of fine aggregate, 7 parts of polycarboxylic acid high-efficiency water reducer, 65 parts of fly ash and 190 parts of water according to a proportion to obtain high-temperature-resistant high-strength concrete;
the preparation method of the porous reticular light coarse aggregate comprises the following steps:
s1, preparing a light coarse aggregate base material: the method comprises the steps of selecting a polymer sponge with an open-cell foam structure as a lightweight aggregate substrate, wherein the average porosity of the polymer sponge is 94.1%, the size of an air hole is 1.5mm, and the size of the polymer sponge is 5-20mm; wherein the 5-8mm ratio is 35.6%, the 8-12mm ratio is 38.9%, the ratio of 12-16mm by 12-16mm is 15.1%, and the ratio of 16-20mm by 16-20mm is the rest
S2, preparing slurry: adding the fly ash into water, uniformly dispersing by ultrasonic, adding the fly ash into silica sol containing carbon black with the concentration of 25wt%, and uniformly stirring to obtain slurry, wherein the mass ratio of the fly ash to the carbon black to the silica sol is 3:17:6;
s3, preparing prefabricated lightweight coarse aggregate: immersing the substrate into the slurry prepared in the step S2, taking out the lightweight aggregate substrate containing the slurry, and repeating immersing and drying after drying to obtain prefabricated lightweight aggregate;
s4, preparing the light coarse aggregate: placing the prefabricated lightweight aggregate into a sintering furnace to perform carbothermic reduction reaction under the anaerobic condition, heating to 1300 ℃ at a heating rate of 6 ℃/min, and preserving heat for 40min to obtain the lightweight aggregate;
the preparation method of the modified waste carbon fiber comprises the following steps:
s11, cutting the waste carbon fiber to 5mm, then soaking the waste carbon fiber in 45% hydrogen peroxide hot solution, stirring and reacting for 90min, and filtering to obtain oxidized modified waste carbon fiber;
s12, drying the oxidized and modified waste carbon fiber, spraying a silane coupling agent-trimethylhydroxysilane into the oxidized and modified waste carbon fiber in a vacuum state, pressurizing and uniformly stirring the oxidized and modified waste carbon fiber, releasing pressure, spraying a water glass solution with the concentration of 10wt%, aging the oxidized and modified waste carbon fiber for 4 hours at room temperature, and soaking the carbon fiber in the silane coupling agent G-570 solution for surface modification to obtain the modified waste carbon fiber.
Example 4
The preparation method of the porous reticular aggregate/carbon fiber composite modified high-temperature-resistant high-strength concrete comprises the following steps:
uniformly mixing 12 parts of modified waste carbon fibers with 300 parts of porous net-shaped lightweight coarse aggregate, and then adding 360 parts of ordinary Portland cement, 540 parts of fine aggregate, 9 parts of polycarboxylic acid high-efficiency water reducer, 75 parts of fly ash and 210 parts of water according to a proportion to obtain high-temperature-resistant high-strength concrete;
the preparation method of the porous reticular light coarse aggregate comprises the following steps:
s1, preparing a light coarse aggregate base material: the method comprises the steps of selecting a polymer sponge with an open-cell foam structure as a lightweight aggregate substrate, wherein the average porosity of the polymer sponge is 93.2%, the size of an air hole is 1.6mm, and the size of the polymer sponge is 5-20mm; wherein the ratio of 5-8mm is 38.9%, the ratio of 8-12mm is 33.5%, the ratio of 12-16mm by 12-16mm is 15.1%, and the ratio of 16-20mm by 16-20mm is the rest
S2, preparing slurry: adding the fly ash into water, uniformly dispersing by ultrasonic, adding the fly ash into silica sol containing carbon black with the concentration of 20-30wt%, and uniformly stirring to obtain slurry, wherein the mass ratio of the fly ash to the carbon black to the silica sol is 4:12:6;
s3, preparing prefabricated lightweight coarse aggregate: immersing the substrate into the slurry prepared in the step S2, taking out the lightweight aggregate substrate containing the slurry, and repeating immersing and drying after drying to obtain prefabricated lightweight aggregate;
s4, preparing the light coarse aggregate: placing the prefabricated lightweight aggregate into a sintering furnace to perform carbothermic reduction reaction under the anaerobic condition, heating to 1280 ℃ at the reaction heating rate of 8 ℃/min, and preserving heat for 60min to obtain the lightweight aggregate;
the preparation method of the modified waste carbon fiber comprises the following steps:
s11, cutting the waste carbon fiber to 6mm, then soaking the waste carbon fiber in a 40% hydrogen peroxide hot solution, stirring and reacting for 110min, and filtering to obtain oxidized modified waste carbon fiber;
s12, drying the oxidized and modified waste carbon fiber, spraying a silane coupling agent-trimethylhydroxysilane into the oxidized and modified waste carbon fiber in a vacuum state, pressurizing and uniformly stirring the oxidized and modified waste carbon fiber, releasing pressure, spraying water glass solution with the concentration of 15wt%, aging the oxidized and modified waste carbon fiber for 4 hours at room temperature, and soaking the carbon fiber in the silane coupling agent G-570 solution for surface modification to obtain the modified waste carbon fiber.
Example 5
The preparation method of the porous reticular aggregate/carbon fiber composite modified high-temperature-resistant high-strength concrete comprises the following steps:
firstly, uniformly mixing 11 parts of modified waste carbon fibers with 290 parts of porous net-shaped lightweight coarse aggregate, and then adding 350 parts of ordinary Portland cement, 520 parts of fine aggregate, 8 parts of polycarboxylic acid high-efficiency water reducer, 70 parts of fly ash and 200 parts of water according to a proportion to obtain high-temperature-resistant high-strength concrete;
the preparation method of the porous reticular light coarse aggregate comprises the following steps:
s1, preparing a light coarse aggregate base material: the method comprises the steps of selecting a polymer sponge with an open-cell foam structure as a lightweight aggregate substrate, wherein the average porosity of the polymer sponge is 92.5%, the size of an air hole is 1.2mm, and the size of the polymer sponge is 5-20mm; wherein the ratio of 5-8mm is 40.1%, the ratio of 8-12mm is 31.6%, the ratio of 12-16mm by 12-16mm is 9.1%, and the ratio of 16-20mm by 16-20mm is the rest
S2, preparing slurry: adding the fly ash into water, uniformly dispersing by ultrasonic, adding the fly ash into silica sol containing carbon black with the concentration of 22wt%, and uniformly stirring to obtain slurry, wherein the mass ratio of the fly ash to the carbon black to the silica sol is 3:15:7;
s3, preparing prefabricated lightweight coarse aggregate: immersing the substrate into the slurry prepared in the step S2, taking out the lightweight aggregate substrate containing the slurry, and repeating immersing and drying after drying to obtain prefabricated lightweight aggregate;
s4, preparing the light coarse aggregate: placing the prefabricated lightweight aggregate into a sintering furnace to perform carbothermic reduction reaction under the anaerobic condition, heating to 1300 ℃ at a heating rate of 6 ℃/min, and preserving heat for 50min to obtain the lightweight aggregate;
the preparation method of the modified waste carbon fiber comprises the following steps:
s11, cutting the waste carbon fiber to 5mm, then soaking the waste carbon fiber in a 40% hydrogen peroxide hot solution, stirring and reacting for 100min, and filtering to obtain oxidized modified waste carbon fiber;
s12, drying the oxidized and modified waste carbon fiber, spraying a silane coupling agent-trimethylhydroxysilane into the oxidized and modified waste carbon fiber in a vacuum state, pressurizing and uniformly stirring the oxidized and modified waste carbon fiber, releasing pressure, spraying a water glass solution with the concentration of 12wt%, aging the oxidized and modified waste carbon fiber for 5 hours at room temperature, and soaking the carbon fiber in the silane coupling agent G-570 solution for surface modification to obtain the modified waste carbon fiber.
Comparative example 1
The preparation method of the porous reticular aggregate/carbon fiber composite modified high-temperature-resistant high-strength concrete comprises the following steps:
firstly, uniformly mixing 12 parts of waste carbon fibers with 300 parts of porous net-shaped lightweight coarse aggregate, and then adding 360 parts of ordinary Portland cement, 540 parts of fine aggregate, 9 parts of polycarboxylic acid high-efficiency water reducer, 75 parts of fly ash and 210 parts of water according to a proportion to obtain high-temperature-resistant high-strength concrete;
the preparation method of the porous reticular light coarse aggregate comprises the following steps:
s1, preparing a light coarse aggregate base material: the method comprises the steps of selecting a polymer sponge with an open-cell foam structure as a lightweight aggregate substrate, wherein the average porosity of the polymer sponge is 93.2%, the size of an air hole is 1.6mm, and the size of the polymer sponge is 5-20mm; wherein the ratio of 5-8mm is 38.9%, the ratio of 8-12mm is 33.5%, the ratio of 12-16mm by 12-16mm is 15.1%, and the ratio of 16-20mm by 16-20mm is the rest
S2, preparing slurry: adding the fly ash into water, uniformly dispersing by ultrasonic, adding the fly ash into silica sol containing carbon black with the concentration of 20-30wt%, and uniformly stirring to obtain slurry, wherein the mass ratio of the fly ash to the carbon black to the silica sol is 4:12:6;
s3, preparing prefabricated lightweight coarse aggregate: immersing the substrate into the slurry prepared in the step S2, taking out the lightweight aggregate substrate containing the slurry, and repeating immersing and drying after drying to obtain prefabricated lightweight aggregate;
s4, preparing the light coarse aggregate: and (3) placing the prefabricated lightweight aggregate into a sintering furnace to perform carbothermic reduction reaction under the anaerobic condition, heating to 1280 ℃ at the reaction heating rate of 8 ℃/min, and preserving heat for 60min to obtain the lightweight aggregate.
Comparative example 2
A preparation method of ceramsite/carbon fiber composite modified high-temperature-resistant high-strength concrete comprises the following steps:
uniformly mixing 15 parts of modified waste carbon fibers with 320 parts of ceramsite lightweight coarse aggregate, and then adding 400 parts of ordinary Portland cement, 560 parts of fine aggregate, 10 parts of polycarboxylic acid high-efficiency water reducer, 80 parts of fly ash and 220 parts of water according to a proportion to obtain high-temperature-resistant high-strength concrete;
the preparation method of the modified waste carbon fiber comprises the following steps:
s11, cutting the waste carbon fiber to 7mm, then soaking the waste carbon fiber in a hydrogen peroxide hot solution with the concentration of 50%, stirring and reacting for 120min, and filtering to obtain oxidized modified waste carbon fiber;
s12, drying the oxidized and modified waste carbon fiber, spraying a silane coupling agent-trimethylhydroxysilane into the oxidized and modified waste carbon fiber in a vacuum state, pressurizing and uniformly stirring the oxidized and modified waste carbon fiber, releasing pressure, spraying water glass solution with the concentration of 15wt%, aging the oxidized and modified waste carbon fiber for 4 hours at room temperature, and soaking the carbon fiber in the silane coupling agent G-570 solution for surface modification to obtain the modified waste carbon fiber.
Comparative example 3
The preparation method of the porous reticular aggregate/carbon fiber composite modified high-temperature-resistant high-strength concrete comprises the following steps:
uniformly mixing 16 parts of modified waste carbon fibers with 330 parts of porous net-shaped lightweight coarse aggregate, and then adding 400 parts of ordinary Portland cement, 540 parts of fine aggregate, 10 parts of polycarboxylic acid high-efficiency water reducer, 75 parts of fly ash and 210 parts of water according to a proportion to obtain high-temperature-resistant high-strength concrete;
the preparation method of the lightweight coarse aggregate comprises the following steps:
s1, preparing a light coarse aggregate base material: the method comprises the steps of selecting a polymer sponge with an open-cell foam structure as a lightweight aggregate substrate, wherein the average porosity of the polymer sponge is 65%, the size of an air hole is 2mm, and the size of the polymer sponge is 5-20mm; wherein the ratio of 5-8mm is 22.0%, the ratio of 8-12mm is 45.5%, the ratio of 12-16mm by 12-16mm is 15.1%, and the ratio of 16-20mm by 16-20mm is the rest
S2, preparing slurry: adding the fly ash into water, uniformly dispersing by ultrasonic, adding the fly ash into silica sol containing carbon black with the concentration of 30wt%, and uniformly stirring to obtain slurry, wherein the mass ratio of the fly ash to the carbon black to the silica sol is 5:20:10;
s3, preparing prefabricated lightweight coarse aggregate: immersing the substrate into the slurry prepared in the step S2, taking out the lightweight aggregate substrate containing the slurry, and repeating immersing and drying after drying to obtain prefabricated lightweight aggregate;
s4, preparing the light coarse aggregate: placing the prefabricated lightweight aggregate into a sintering furnace to perform carbothermic reduction reaction under the anaerobic condition, heating to 1330 ℃ at the reaction heating rate of 10 ℃/min, and preserving heat for 60min to obtain the lightweight aggregate;
the preparation method of the modified waste carbon fiber comprises the following steps:
s11, cutting the waste carbon fiber to 7mm, then soaking the waste carbon fiber in a hydrogen peroxide hot solution with the concentration of 50%, stirring and reacting for 120min, and filtering to obtain oxidized modified waste carbon fiber;
s12, drying the oxidized and modified waste carbon fiber, spraying a silane coupling agent-trimethylhydroxysilane into the oxidized and modified waste carbon fiber in a vacuum state, pressurizing and uniformly stirring the oxidized and modified waste carbon fiber, releasing pressure, spraying water glass solution with the concentration of 15wt%, aging the oxidized and modified waste carbon fiber for 4 hours at room temperature, and soaking the carbon fiber in the silane coupling agent G-570 solution for surface modification to obtain the modified waste carbon fiber.
Compressive strength: the standard test block is manufactured according to the method in GB/T50081-2016 standard for test method of common concrete mechanical properties, and the compressive strength of the standard test block after curing for 3d, 7d and 28d and the compressive strength at high temperature after standard curing for 28d are measured;
the compressive strength at high temperature was measured by the following method:
taking 3 molded test pieces from each group, drying for 24 hours at 110 ℃ after standard curing for 28 days, placing in a high-temperature furnace, burning for 3 hours at 200 ℃, 300 ℃, 400 ℃,500 ℃, 600 ℃ and 700 ℃ respectively, naturally cooling to room temperature, and testing the compressive strength after high-temperature burning.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (9)
1. The porous reticular aggregate/carbon fiber composite modified high-temperature-resistant high-strength concrete is characterized by comprising the following components:
300-400 parts of ordinary Portland cement
260-320 parts of porous net-shaped lightweight aggregate
480-560 parts of 0.15-2.5mm fine aggregate
6-10 parts of polycarboxylic acid high-efficiency water reducer
8-15 parts of modified waste carbon fiber
60-80 parts of fly ash
180-220 parts of water.
2. The porous reticular aggregate/carbon fiber composite modified high-temperature-resistant high-strength concrete according to claim 1, wherein the preparation method of the porous reticular lightweight coarse aggregate is as follows:
s1, preparing a light coarse aggregate base material: the method comprises the steps of selecting a high molecular sponge with an open-cell foam structure as a lightweight aggregate substrate;
s2, preparing slurry: adding the fly ash into water, uniformly dispersing by ultrasonic, adding the fly ash into silica sol containing carbon black, and uniformly stirring to obtain slurry;
s3, preparing prefabricated lightweight coarse aggregate: immersing the substrate into the slurry prepared in the step S2, taking out the lightweight aggregate substrate containing the slurry, and repeating immersing and drying after drying to obtain prefabricated lightweight aggregate;
s4, preparing the light coarse aggregate: and (3) placing the prefabricated lightweight aggregate into a sintering furnace to perform carbothermic reduction reaction under the anaerobic condition to obtain the lightweight aggregate.
3. The porous reticulated aggregate/carbon fiber composite modified high temperature and high strength concrete according to claim 1, wherein: the porosity of the polymer sponge in the step S1 is 90-95%, the size of the air hole is 1-2mm, and the size of the polymer sponge is 5-20mm.
4. The porous reticulated aggregate/carbon fiber composite modified high temperature and high strength concrete according to claim 1, wherein: the concentration of the silica sol in the step S2 is 20-30wt%, the source of the fly ash is a thermal power plant, and the content of the silicon dioxide in the fly ash is 9.6-15.5wt%.
5. The porous reticulated aggregate/carbon fiber composite modified high temperature and high strength concrete according to claim 1, wherein: in the step S2, the mass ratio of the fly ash to the carbon black to the silica sol is 2-5:10-20:5-10.
6. The porous reticulated aggregate/carbon fiber composite modified high temperature and high strength concrete according to claim 1, wherein: and in the step S4, the heating rate of the carbothermic reaction is 5-10 ℃/min, the carbothermic reaction is heated to 1250-1330 ℃, and the carbothermic reaction is kept for 20-60min.
7. The porous reticulated aggregate/carbon fiber composite modified high-temperature and high-strength concrete according to claim 1, wherein the preparation method of the modified waste carbon fiber is as follows:
s11, cutting the waste carbon fiber to 3-7mm, then soaking the waste carbon fiber in a 40-50% hydrogen peroxide hot solution, stirring and reacting for 60-120min, and filtering to obtain oxidized modified waste carbon fiber;
s12, drying the oxidized and modified waste carbon fiber, spraying a silane coupling agent into the oxidized and modified waste carbon fiber in a vacuum state, pressurizing and stirring uniformly, decompressing, spraying a water glass solution with the concentration of 10-15wt%, aging for 4-6 hours at room temperature, soaking the carbon fiber in the silane coupling agent solution after aging, and carrying out surface modification to obtain the modified waste carbon fiber.
8. The porous reticulated aggregate/carbon fiber composite modified high temperature and high strength concrete according to claim 7, wherein: the silane coupling agent solution is silane coupling agent G-570/acetone/ethanol solution.
9. The method for preparing the porous reticular aggregate/carbon fiber composite modified high-temperature-resistant high-strength concrete as claimed in claims 1 to 8, which is characterized by comprising the following steps: the modified waste carbon fiber and the porous net-shaped lightweight coarse aggregate are uniformly mixed according to the proportion, and then the common silicate cement, the fine aggregate, the polycarboxylic acid high-efficiency water reducer, the fly ash and the water are added according to the proportion to obtain the high-temperature-resistant high-strength concrete.
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