CN116535168B - Low-carbon concrete and preparation method thereof - Google Patents
Low-carbon concrete and preparation method thereof Download PDFInfo
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- CN116535168B CN116535168B CN202310592121.9A CN202310592121A CN116535168B CN 116535168 B CN116535168 B CN 116535168B CN 202310592121 A CN202310592121 A CN 202310592121A CN 116535168 B CN116535168 B CN 116535168B
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- 239000004567 concrete Substances 0.000 title claims abstract description 103
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 93
- 238000002360 preparation method Methods 0.000 title claims abstract description 45
- 239000002245 particle Substances 0.000 claims abstract description 185
- 239000002699 waste material Substances 0.000 claims abstract description 136
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 133
- 239000013307 optical fiber Substances 0.000 claims abstract description 88
- 239000010453 quartz Substances 0.000 claims abstract description 81
- 239000000843 powder Substances 0.000 claims abstract description 79
- 239000013078 crystal Substances 0.000 claims abstract description 59
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000002893 slag Substances 0.000 claims abstract description 25
- 239000004576 sand Substances 0.000 claims abstract description 22
- 239000004575 stone Substances 0.000 claims abstract description 21
- 229910021487 silica fume Inorganic materials 0.000 claims abstract description 20
- 239000010881 fly ash Substances 0.000 claims abstract description 16
- 239000002994 raw material Substances 0.000 claims abstract description 16
- 239000000377 silicon dioxide Substances 0.000 claims abstract description 15
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 13
- 239000004568 cement Substances 0.000 claims abstract description 12
- 239000000835 fiber Substances 0.000 claims description 83
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 57
- 229910052710 silicon Inorganic materials 0.000 claims description 57
- 239000010703 silicon Substances 0.000 claims description 57
- 238000003756 stirring Methods 0.000 claims description 29
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 28
- 239000006185 dispersion Substances 0.000 claims description 18
- 239000007788 liquid Substances 0.000 claims description 14
- 238000002156 mixing Methods 0.000 claims description 13
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 9
- 238000003837 high-temperature calcination Methods 0.000 claims description 7
- 239000003513 alkali Substances 0.000 claims description 6
- 238000001354 calcination Methods 0.000 claims description 6
- 238000005406 washing Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 4
- 229910052783 alkali metal Inorganic materials 0.000 claims description 3
- 150000001340 alkali metals Chemical class 0.000 claims description 3
- 239000011261 inert gas Substances 0.000 claims description 2
- 230000007774 longterm Effects 0.000 abstract description 6
- 230000000052 comparative effect Effects 0.000 description 25
- 239000011398 Portland cement Substances 0.000 description 12
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 239000002253 acid Substances 0.000 description 9
- 238000009792 diffusion process Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 6
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 230000007935 neutral effect Effects 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 239000000654 additive Substances 0.000 description 3
- 230000000996 additive effect Effects 0.000 description 3
- 230000003628 erosive effect Effects 0.000 description 3
- 239000012299 nitrogen atmosphere Substances 0.000 description 3
- 239000013535 sea water Substances 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000008187 granular material Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000004913 activation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- -1 chlorine ions Chemical class 0.000 description 1
- 239000004927 clay Substances 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
- 239000011246 composite particle Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000003746 surface roughness Effects 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/02—Granular materials, e.g. microballoons
- C04B14/04—Silica-rich materials; Silicates
-
- 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
- C04B14/00—Use of inorganic materials as fillers, e.g. pigments, for mortars, concrete or artificial stone; Treatment of inorganic materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B14/38—Fibrous materials; Whiskers
- C04B14/42—Glass
-
- 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/02—Agglomerated materials, e.g. artificial aggregates
- C04B18/023—Fired or melted materials
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- 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
-
- 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
- C04B2111/24—Sea water resistance
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The application relates to the technical field of low-carbon concrete, and particularly discloses low-carbon concrete and a preparation method thereof. The low-carbon concrete comprises the following raw materials in parts by weight: 150-200 parts of cement, 120-180 parts of slag powder, 120-200 parts of fly ash, 100-120 parts of silica fume, 100-150 parts of modified optical fiber particles, 120-150 parts of water, 680-720 parts of machine-made sand, 750-1000 parts of crushed stone and 1-6 parts of water reducer, wherein the modified optical fiber particles are obtained by carrying silica crystal waste powder on quartz optical fiber waste particles. The low-carbon concrete has the advantages of high early strength, high long-term strength and good durability.
Description
Technical Field
The application relates to the technical field of low-carbon concrete, in particular to low-carbon concrete and a preparation method thereof.
Background
Concrete is a large amount of materials in the building material industry, is an important raw material, and has wide application scene and large market demand. Realizing low carbon concrete is always a development direction advocated in the field, and the general understanding of low carbon is: the carbon emission is reduced from the concrete raw material, the product production and the later application, so as to realize low carbon.
From the standpoint of concrete raw materials, the modes for realizing low carbon are as follows: other low-carbon substances are used for replacing or partially replacing the cementing material. For example, the cement is partially replaced with slag powder and an extra-powder additive; for example, cement is replaced by industrial solid waste, and the waste can be slag, waste concrete, alkali slag, carbide slag, iron tailing slag and the like; for another example, cement is replaced with a natural material having gelling properties, which may be metakaolin, clay, red mud, pozzolan, and the like. The above proposal solves or solves the problem of high carbon content of the concrete to a certain extent, but the low carbon concrete has the following problems: low carbon concrete has excellent early strength but poor long-term strength and poor durability.
Therefore, it has been a research hotspot for those skilled in the art to improve early-stage and long-term strength and durability of low-carbon concrete, and it is necessary to propose a new low-carbon concrete having high early-stage and long-term strength and excellent durability.
Disclosure of Invention
In order to solve the problems of low early stage, low long-term strength and poor durability of low-carbon concrete, the application provides low-carbon concrete and a preparation method thereof.
In a first aspect, the application provides a low-carbon concrete, which adopts the following technical scheme:
The low-carbon concrete comprises the following raw materials in parts by weight:
150-200 parts of cement, 120-180 parts of slag powder, 120-200 parts of fly ash, 100-120 parts of silica fume, 100-150 parts of modified fiber particles, 120-150 parts of water, 680-720 parts of machine-made sand, 750-1000 parts of crushed stone and 1-6 parts of water reducer;
The modified optical fiber particles are obtained by the steps of carrying out high-temperature calcination at 800-1000 ℃ on quartz optical fiber waste particles after silicon crystal waste powder is loaded.
The application is based on the problem of low utilization rate of the existing quartz optical fiber waste and silicon crystal waste, and utilizes the two wastes to prepare the modified optical fiber particles. Both of the two wastes have excellent properties such as excellent strength and acid and alkali corrosion resistance. In this scheme, by combining silica fiber scrap particles and silicon crystal scrap powder together, the silica fiber scrap particles are partially or completely coated with the silicon crystal scrap powder to form a stable composite particle, i.e., modified fiber particles, which can significantly improve the strength and durability of low-carbon concrete. If quartz optical fiber waste particles or silicon crystal waste powder are added alone, the strength and durability of the low-carbon concrete are improved to a certain extent, but the improvement degree is limited, and the improvement degree may be related to the dispersion uniformity, the bonding stability and the strength of the low-carbon concrete of the two raw materials in the concrete: after the silica crystal waste powder is loaded on the silica fiber waste particles, the surface roughness of the obtained modified fiber particles is increased, so that other components in the low-carbon concrete can be combined with the modified fiber particles more and the combination stability is improved; in addition, after calcination at a high temperature of 800-1000 ℃, the silica fiber waste particles are further activated, so that the activity of the modified fiber particles is higher, and the binding stability of the remaining components in the low-carbon concrete is further enhanced. When the quartz fiber waste particles are used alone, the strength of the low-carbon concrete is not improved enough; when the silicon crystal scrap powder or the silicon crystal particles are added alone, the dispersibility of the additive and other raw materials in the low-carbon concrete is poor, and the additive is likely to settle at a high addition amount, thereby affecting the strength and durability of the low-carbon concrete. Therefore, by adopting the technical scheme, the added modified fiber particles can achieve the effects of uniformly dispersing the modified fiber particles in low-carbon concrete and improving the strength, and the effect of improving the strength and the durability of the modified fiber particles is exerted to a greater extent under the condition of higher addition, so that the strength and the durability of the low-carbon concrete are obviously improved.
Optionally, the silicon crystal scrap powder is added in an amount of 30-70wt% of the silica fiber scrap particles.
By adopting the technical scheme, the modified optical fiber particles are prepared from the raw materials in proper proportion, so that the strength of the low-carbon concrete is considered, and the activity of the quartz optical fiber waste particles is considered, and the modified optical fiber particles can better play a role in improving the strength and durability of the low-carbon concrete. The addition amount of the silicon crystal waste powder is too small, and the strength of the low-carbon concrete is not high; the silicon crystal waste powder is excessively added, the surface of the quartz optical fiber waste particles is completely coated by the silicon crystal waste powder, and no or few parts exposed to other components of the concrete, namely, the activated parts of the modified optical fiber particles are completely or almost completely coated by the silicon crystal waste powder, so that the obtained modified optical fiber particles are difficult to interact with other components in the low-carbon concrete under the addition of the application, and a large amount of sedimentation of the modified optical fiber particles occurs. Therefore, the modified optical fiber particles prepared from the raw materials in the proportion can remarkably improve the strength and durability of the low-carbon concrete.
Further alternatively, the silicon crystal scrap powder is added in an amount of 50-60wt% of the silica optical fiber scrap particles.
Alternatively, the silica fiber scrap particles have a particle diameter of 50-100 μm and the silicon crystal scrap powder has a particle diameter of 15-25 μm.
Through adopting above-mentioned technical scheme, the particle diameter of quartz optical fiber waste material granule is greater than silicon crystal waste material powder far away for silicon crystal waste material powder can load on quartz optical fiber waste material granule better, avoids silicon crystal waste material powder too big, leads to the effort that load stabilization needs to be higher and leads to silicon crystal waste material to be difficult to stable load. Meanwhile, the modified fiber particles prepared from the raw materials with the particle size have proper particle size and good dispersibility, so that the strength and durability of the low-carbon concrete can be remarkably improved.
Optionally, the preparation method of the modified fiber particles comprises the following steps:
a1, immersing quartz fiber waste particles in 20-50wt% of alkali metal alkali liquor, stirring, mixing, and washing to obtain an alkalized quartz fiber waste particle dispersion liquid for later use;
A2, taking the dispersion liquid of the alkalized quartz optical fiber waste particles, adding a silane coupling agent and silicon crystal waste powder, stirring and dispersing, and then removing water to obtain alkalized quartz optical fiber waste particles loaded with the silicon crystal waste powder;
a3, calcining the alkalized quartz optical fiber waste particles loaded with the silicon crystal waste powder at a high temperature of 800-1000 ℃ under inert gas to obtain modified optical fiber particles.
By adopting the technical scheme, the added alkali metal alkali liquor reacts with the outer surface of the quartz optical fiber waste particles, but does not completely react with the quartz optical fiber waste particles, and the obtained alkalized quartz optical fiber waste particles have certain activity, are uniformly mixed with silicon crystal waste powder under the action of a silane coupling agent, and stably load the silicon crystal waste powder. Subsequent high temperature calcination further causes the silicon crystal scrap powder to stably coat on and further activate the silica fiber scrap particles. The modified fiber particles finally obtained by the method can be stably dispersed in the low-carbon concrete and play a role.
Further alternatively, the content of the alkalized quartz fiber waste particles in the alkalized quartz fiber waste particle dispersion liquid is 10-50wt%; the addition amount of the silane coupling agent is 0.5-1.5wt% of the alkalized quartz optical fiber waste particles.
Further alternatively, the stirring and mixing time in A1 is 5-115min.
By adopting the technical scheme, the quartz optical fiber waste particles are properly activated by proper mixing and stirring time so as to stably combine with silicon crystal waste powder; the stirring and mixing time is too long, and the quartz fiber waste particles are excessively activated, so that the capability of combining silicon crystal waste powder is enhanced, so that the quartz fiber waste particles are coated with excessive silicon crystal waste powder, the later-stage high-temperature calcination and activation effects are affected, the compatibility of the obtained modified fiber particles and the rest components of the low-carbon concrete is poor, and the strength and durability of the low-carbon concrete are further affected; the stirring time is too short, and the silica fiber waste particles are difficult to stably load the silicon crystal waste powder, and also affect the strength and durability of the low-carbon concrete.
Further alternatively, the time of high temperature calcination in A3 is 30-90min.
Optionally, the specific surface area of the slag powder is 350-550m 2/kg, the particle size of the fly ash is 100-5000nm, the particle size of the silica fume is 100-1000nm, and the particle size of the cement is 0.1-50 mu m.
By adopting the technical scheme, the cement, the slag powder, the fly ash and the silica fume have a certain grading relationship in particle size, and the graded cementing material can further improve the strength and the durability of the prepared low-carbon concrete.
Optionally, the crushed stone is graded 5-20 mm; the machine-made sand adopts machine-made sand with the grading of 0.01-5 mm.
By adopting the technical scheme, the graded aggregate ensures that the compactness of the low-carbon concrete is higher, and a certain grading is formed between the aggregate and the cementing material, so that the strength and the durability of the prepared low-carbon concrete can be further improved.
Alternatively, the silicon crystal scrap powder is selected from one or more of monocrystalline silicon scrap powder and polycrystalline silicon scrap powder.
In a second aspect, the application provides a preparation method of the low-carbon concrete, which adopts the following technical scheme:
the preparation method of the low-carbon concrete comprises the following steps:
S1, mixing and uniformly stirring the machine-made sand and the broken stone according to the formula amount, adding the cement, the slag powder, the fly ash and the silica fume according to the formula amount, and then uniformly stirring;
s2, adding water and a water reducer with the formula amount into the mixture obtained in the step S1, uniformly stirring, adding modified fiber particles, and uniformly stirring to obtain a concrete mixture;
And S3, curing the concrete mixture to obtain the low-carbon concrete.
In summary, the application has the following beneficial effects:
1. According to the application, the strength and durability of the low-carbon concrete are obviously improved by adding the modified fiber particles when the low-carbon concrete is prepared, wherein the modified fiber particles are prepared from quartz fiber waste and silicon crystal waste serving as raw materials, so that waste utilization is realized; when the modified optical fiber particles are prepared, a proper amount of silicon crystal waste powder is loaded on the quartz optical fiber waste particles, and the composite is activated by high-temperature calcination, so that the modified optical fiber waste with excellent compatibility with a low-carbon concrete system is obtained, and finally, the strength and the durability of the low-carbon concrete are obviously improved.
2. The particle size of the quartz fiber waste particles is 50-100 mu m, and the particle size of the silicon crystal waste powder is 15-25 mu m, and the application has the advantages that the coating area of the quartz fiber waste particles can be adjusted by adjusting the addition amount, namely the exposed activated surface area can be adjusted, and further the modified fiber particles which can remarkably improve the strength and the durability of the low-carbon concrete are obtained.
3. When the modified optical fiber particles are prepared, firstly, alkali liquor is used for treating the surface area of the quartz optical fiber waste particles so that the quartz optical fiber waste particles can stably load silicon crystal waste powder; in addition, the connection of the silane coupling agent and the optical fiber is further enhanced through the addition of the silane coupling agent, so that stable modified optical fiber particles are finally prepared.
Detailed Description
The present application will be described in further detail with reference to examples.
The raw materials of the application are all commonly and commercially available unless otherwise specified.
Preparation example of modified fiber particles
Preparation example 1
The preparation method of the modified optical fiber particles comprises the following steps:
A1, immersing 10kg of quartz optical fiber waste particles in a 20wt% NaOH solution, stirring and mixing for 15min, then washing with water to be neutral in pH, and regulating the water quantity to obtain the required dispersion liquid of the quartz optical fiber waste particles for standby. Wherein, the quartz optical fiber waste particles are obtained by crushing quartz optical fiber waste and screening out the part with the particle diameter of 50-100 mu m; the content of the alkalized quartz optical fiber waste particles in the alkalized quartz optical fiber waste particle dispersion liquid was made to be 10wt% by water amount adjustment.
A2, taking the dispersion liquid of the alkalized quartz optical fiber waste particles prepared in the step A1, adding 0.5wt% of silane coupling agent into the alkalized quartz optical fiber waste particles, adding 30wt% of silicon crystal waste powder into the quartz optical fiber waste particles, stirring and dispersing for 15min, and filtering to remove water to obtain the alkalized quartz optical fiber waste particles loaded with the silicon crystal waste powder. Wherein the silicon crystal waste powder is obtained by pulverizing and grinding monocrystalline silicon waste, and taking a part with a particle size of 15-25 μm.
A3, calcining the alkalized quartz optical fiber waste particles loaded with the silicon crystal waste powder at a high temperature of 800 ℃ for 90min in a nitrogen atmosphere to obtain modified optical fiber particles.
Preparation example 2
The preparation method of the modified optical fiber particles comprises the following steps:
a1, immersing 10kg of quartz optical fiber waste particles in 40wt% NaOH solution, stirring and mixing for 10min, then washing with water to be neutral in pH, and regulating the water quantity to obtain an alkalized quartz optical fiber waste particle dispersion liquid for later use. Wherein, quartz optical fiber waste particles are the same as in preparation example 1; the content of the alkalized quartz fiber waste particles in the alkalized quartz fiber waste particle dispersion was 30wt%.
A2, taking the dispersion liquid of the alkalized quartz optical fiber waste particles prepared in the step A1, adding 1.0wt% of silane coupling agent into the alkalized quartz optical fiber waste particles, adding 50wt% of silicon crystal waste powder into the quartz optical fiber waste particles, stirring and dispersing for 15min, and filtering to remove water to obtain the alkalized quartz optical fiber waste particles loaded with the silicon crystal waste powder. Wherein the silicon crystal scrap powder was the same as in preparation example 1.
A3, calcining the alkalized quartz optical fiber waste particles loaded with the silicon crystal waste powder at a high temperature of 900 ℃ for 60 minutes in a nitrogen atmosphere to obtain modified optical fiber particles.
Preparation example 3
The preparation method of the modified optical fiber particles comprises the following steps:
A1, immersing 10kg of quartz optical fiber waste particles in a 50wt% NaOH solution, stirring and mixing for 5min, then washing with water to be neutral in pH, and regulating the water quantity to obtain an alkalized quartz optical fiber waste particle dispersion liquid for later use. Wherein, quartz optical fiber waste particles are the same as in preparation example 1; the content of the alkalized quartz fiber waste particles in the alkalized quartz fiber waste particle dispersion was 50wt%.
A2, taking the dispersion liquid of the alkalized quartz optical fiber waste particles prepared in the step A1, adding 1.5wt% of silane coupling agent into the alkalized quartz optical fiber waste particles, adding 70wt% of silicon crystal waste powder into the quartz optical fiber waste particles, stirring and dispersing for 15min, and filtering to remove water to obtain the alkalized quartz optical fiber waste particles loaded with the silicon crystal waste powder. Wherein the silicon crystal scrap powder was the same as in preparation example 1.
A3, calcining the alkalized quartz optical fiber waste particles loaded with the silicon crystal waste powder at a high temperature of 1000 ℃ for 30min in a nitrogen atmosphere to obtain modified optical fiber particles.
Preparation examples 4 to 9
Preparation examples 4-9 differ from example 2 in the raw materials and/or raw material proportions of the modified fiber optic waste particles, as shown in Table 1.
TABLE 1 raw materials and proportions in different preparations
Preparation example 10
The difference between this preparation example and preparation example 6 is that the preparation of the modified fiber particles is performed only by steps A1 and A2, and not by step A3, specifically:
a1, immersing 10kg of quartz optical fiber waste particles in 40wt% NaOH solution, stirring and mixing for 10min, then washing with water to be neutral in pH, and regulating the water quantity to obtain an alkalized quartz optical fiber waste particle dispersion liquid for later use. Wherein, quartz optical fiber waste particles are the same as in preparation example 1; the content of the alkalized quartz fiber waste particles in the alkalized quartz fiber waste particle dispersion was 30wt%.
A2, taking the dispersion liquid of the alkalized quartz optical fiber waste particles prepared in the step A1, adding 1.0wt% of silane coupling agent into the alkalized quartz optical fiber waste particles, adding 55wt% of silicon crystal waste powder into the quartz optical fiber waste particles, stirring and dispersing for 15min, filtering and removing water, and drying to obtain the modified optical fiber particles.
Examples
Example 1
The low-carbon concrete comprises the following components in percentage by weight: 15kg of 42.5 grade ordinary Portland cement, 12kg of S95 slag powder, 12kg of I grade fly ash, 10kg of silica fume, 10kg of modified fiber particles, 12kg of water, 68kg of machine-made sand, 75kg of broken stone and 0.1kg of high-efficiency polycarboxylic acid type water reducer. Wherein the specific surface area of the S95 slag powder is 355m 2/kg, the particle size of the 42.5-grade ordinary Portland cement is 0.1-40 mu m, the particle size of the silica fume is 100-1000nm, the crushed stone adopts crushed stone with the grading of 5-20mm, the machine-made sand adopts machine-made sand with the grading of 0.01-5mm, and the modified optical fiber particles are prepared by the preparation example 1.
The preparation method of the low-carbon concrete comprises the following steps:
s1, mixing and uniformly stirring the machine-made sand and the crushed stone according to the formula amount, adding the 42.5-grade ordinary Portland cement, the S95 slag powder, the I-grade fly ash and the silica fume according to the formula amount, and then uniformly stirring;
S2, adding water and a high-efficiency polycarboxylic acid type water reducer with the formula amount into the mixture obtained in the step S1, uniformly stirring, adding modified optical fiber particles, and uniformly stirring to obtain a concrete mixture;
And S3, curing the concrete mixture to obtain the low-carbon concrete.
Example 2
The low-carbon concrete comprises the following components in percentage by weight: 18kg of 42.5 grade ordinary Portland cement, 15kg of S95 slag powder, 16kg of I grade fly ash, 11kg of silica fume, 12kg of modified fiber particles, 14kg of water, 70kg of machine-made sand, 90kg of broken stone and 0.4kg of high-efficiency polycarboxylic acid type water reducer. Wherein, S95 slag powder, 42.5-grade ordinary Portland cement, silica fume, crushed stone and machine-made sand were prepared in the same manner as in example 1 and modified fiber particles were prepared in preparation example 2.
The preparation method of the low carbon concrete is the same as in example 2.
Example 3
The low-carbon concrete comprises the following components in percentage by weight: 20kg of 42.5 grade ordinary Portland cement, 18kg of S95 slag powder, 20kg of I grade fly ash, 12kg of silica fume, 15kg of modified fiber particles, 15kg of water, 72kg of machine-made sand, 100kg of broken stone and 0.6kg of high-efficiency polycarboxylic acid type water reducer. Wherein, S95 slag powder, 42.5-grade ordinary Portland cement, silica fume, crushed stone and machine-made sand were the same as in example 1, and modified fiber particles were prepared in preparation example 3.
The preparation method of the low carbon concrete is the same as in example 3.
Examples 4 to 7
Examples 4-7 differ from example 1 in that modified fiber particles were prepared in different preparations, see in particular Table 2.
Table 2 selection of modified fiber particles in different embodiments
| Description of the embodiments | Example 2 | Example 4 | Example 5 | Example 6 | Example 7 |
| Modified fiber particle sources | Preparation example 2 | Preparation example 5 | Preparation example 6 | Preparation example 7 | Preparation example 8 |
Comparative example
Comparative examples 1 to 3
Comparative examples 1-3 differ from example 5 in that modified fiber particles were prepared in different preparations, see in particular Table 3.
Table 3 selection of modified fiber particles in different embodiments
| Description of the embodiments | Example 5 | Comparative example 1 | Comparative example 2 | Comparative example 3 |
| Modified fiber particle sources | Preparation example 6 | Preparation example 4 | Preparation example 9 | Preparation example 10 |
Comparative example 4
The difference between this comparative example and example 5 is that the modified fiber particles are replaced by the quartz fiber waste particles of equal weight in the components of the low carbon concrete, otherwise identical to example 5.
Specifically, the low-carbon concrete comprises the following components in percentage by weight: 18kg of 42.5 grade ordinary Portland cement, 15kg of S95 slag powder, 16kg of I grade fly ash, 11kg of silica fume, 12kg of quartz fiber waste particles, 14kg of water, 70kg of machine-made sand, 90kg of broken stone and 0.4kg of high-efficiency polycarboxylic acid type water reducer. Wherein, S95 slag powder, 42.5 grade ordinary Portland cement, silica fume, broken stone and machine-made sand are the same as in example 5, and the quartz fiber waste particles are obtained by crushing quartz fiber waste and screening out the part with the particle size of 50-100 μm.
Comparative example 5
The difference between this comparative example and example 5 is that the amount of modified fiber particles added to the components of the low carbon concrete is different, and this comparative example is 9kg, and the other is the same as example 5.
Specifically, the low-carbon concrete comprises the following components in percentage by weight: 18kg of 42.5 grade ordinary Portland cement, 15kg of S95 slag powder, 16kg of I grade fly ash, 11kg of silica fume, 9kg of modified fiber particles, 14kg of water, 70kg of machine-made sand, 90kg of broken stone and 0.4kg of high-efficiency polycarboxylic acid type water reducer.
Comparative example 6
The difference between this comparative example and example 5 is that the amount of modified fiber particles added to the components of the low carbon concrete is different, and this comparative example is 16kg, and the other is the same as example 5.
Specifically, the low-carbon concrete comprises the following components in percentage by weight: 18kg of 42.5 grade ordinary Portland cement, 15kg of S95 slag powder, 16kg of I grade fly ash, 11kg of silica fume, 16kg of modified fiber particles, 14kg of water, 70kg of machine-made sand, 90kg of broken stone and 0.4kg of high-efficiency polycarboxylic acid type water reducer.
Comparative example 7
The comparative example differs from example 5 in that the components of the low carbon concrete do not contain modified fiber particles, otherwise the same as in example 5.
Specifically, the low-carbon concrete comprises the following components in percentage by weight: 18kg of 42.5 grade ordinary Portland cement, 15kg of S95 slag powder, 16kg of I grade fly ash, 11kg of silica fume, 14kg of water, 70kg of machine-made sand, 90kg of broken stone and 0.4kg of high-efficiency polycarboxylic acid type water reducer.
Detection test
1. Compressive strength: the specific results are shown in Table 4 with reference to the relevant regulations and detection of GB/T50081-2019 "Standard of test method for mechanical Properties of common concrete".
2. Durability test: the durability test of the product is carried out by referring to GB/T50082-2009 Standard for test method of ordinary concrete long-term Performance and durability, and the specific results are shown in Table 4.
3. The products were tested for sulfate corrosion resistance and seawater corrosion resistance with reference to GB/T749-2008 method for testing Cement for sulfate corrosion resistance, and the specific results are shown in Table 5.
TABLE 4 Properties of different Low carbon concretes
As can be seen from the results of Table 4, the low-carbon concretes prepared in examples 1 to 7 of the present application have excellent strength and chlorine ion diffusion resistance. As can be seen from comparison of examples 2, 4-7 and comparative examples 1-2, the silicon crystal scrap powder was recommended to be added in an amount of 30 to 70wt% and further 50 to 60wt% to the silica fiber scrap particles when preparing the modified fiber particles, otherwise it was difficult to obtain modified fiber particles significantly improving the strength and resistance to diffusion of chlorine ions of low-carbon concrete. The relative amounts of silicon crystal scrap powder and silica fiber scrap particles added therein affect the overall strength of the resulting modified fiber particles and the activity of the modified fiber particles in concrete: the relative amount of the silicon crystal waste powder is excessive, so that the silicon crystal waste powder is combined on the quartz optical fiber waste particles too much, the activated area of the quartz optical fiber waste particles exposed in the low-carbon concrete is relatively small, and the compatibility of the modified optical fiber particles and other components of the low-carbon concrete is directly influenced, so that the strength and the chlorine ion diffusion resistance of the low-carbon concrete are influenced; the relative amount of silicon crystal scrap powder is too small, directly affecting the strength and durability of the modified fiber particles, resulting in poor low carbon concrete strength and resistance to chloride ion diffusion.
In addition, as is apparent from the results of example 5 and comparative example 3, in preparing the modified fiber particles, the high temperature calcination step thereof is very important, which directly affects the compatibility of the modified fiber particles with other components in the low carbon concrete, thereby affecting the strength and resistance to diffusion of chloride ions of the low carbon concrete.
While examples 5 and 4 and 7 reflect the importance of adding modified fiber particles in low carbon concrete: replacement of the modified fiber particles with silica fiber scrap particles in comparative example 4 or direct absence of the modified fiber particles added in comparative example 7 would directly and significantly reduce the strength and resistance to chloride ion diffusion of the low carbon concrete.
Further, it is shown by example 5, comparative examples 5 to 6 that: when modified fiber particles are added into low-carbon concrete, the addition amount is recommended to be in the range of 100-150 parts so as to ensure that the strength and the chloride ion diffusion resistance of the low-carbon concrete are obviously improved.
TABLE 5 durability of different Low carbon concretes
| Description of the embodiments | Coefficient of seawater erosion resistance for 28 days | Sulfate corrosion resistance coefficient for 28 days |
| Example 2 | 1.32 | 1.46 |
| Example 5 | 1.38 | 1.54 |
| Comparative example 3 | 1.13 | 1.24 |
| Comparative example 4 | 1.02 | 1.12 |
| Comparative example 7 | 0.98 | 1.02 |
As can be seen from the data in table 5, the low carbon concrete prepared according to the present application (examples 2 and 5) has significantly higher resistance to seawater erosion and sulfate erosion than the conventional low carbon concrete (comparative examples 3 to 4).
The present embodiment is only for explanation of the present application and is not to be construed as limiting the present application, and modifications to the present embodiment, which may not creatively contribute to the present application as required by those skilled in the art after reading the present specification, are all protected by patent laws within the scope of claims of the present application.
Claims (7)
1. The low-carbon concrete is characterized by comprising the following raw materials in parts by weight:
150-200 parts of cement, 120-180 parts of slag powder, 120-200 parts of fly ash, 100-120 parts of silica fume, 100-150 parts of modified fiber particles, 120-150 parts of water, 680-720 parts of machine-made sand, 750-1000 parts of crushed stone and 1-6 parts of water reducer;
the preparation method of the modified optical fiber particles comprises the following steps:
A1, immersing quartz fiber waste particles in 20-50wt% of alkali metal alkali liquor, stirring, mixing, and washing to obtain an alkalized quartz fiber waste particle dispersion liquid for later use;
A2, taking the dispersion liquid of the alkalized quartz optical fiber waste particles, adding a silane coupling agent and silicon crystal waste powder, stirring and dispersing, and then removing water to obtain alkalized quartz optical fiber waste particles loaded with the silicon crystal waste powder;
A3, calcining the alkalized quartz optical fiber waste particles loaded with the silicon crystal waste powder at a high temperature of 800-1000 ℃ under inert gas to obtain modified optical fiber particles;
The addition amount of the silicon crystal waste powder is 30-70wt% of the quartz optical fiber waste particles;
The particle size of the quartz optical fiber waste particles is 50-100 mu m, and the particle size of the silicon crystal waste powder is 15-25 mu m.
2. The low carbon concrete of claim 1, wherein the silicon crystal scrap powder is added in an amount of 50-60wt% of the silica fiber scrap particles.
3. The low carbon concrete according to claim 1, wherein the time for stirring and mixing in A1 is 5 to 115 minutes.
4. The low carbon concrete of claim 1, wherein the time for high temperature calcination in A3 is 30-90min.
5. The low carbon concrete according to claim 1, wherein the specific surface area of the slag powder is 350-550m 2/kg, the particle size of the fly ash is 100-5000nm, the particle size of the silica fume is 100-1000nm, and the particle size of the cement is 0.1-50 μm.
6. The low-carbon concrete according to claim 1, wherein the crushed stone is selected from crushed stone with a grading of 5-20 mm; the machine-made sand adopts machine-made sand with the grading of 0.01-5 mm.
7. The method for preparing low carbon concrete according to any one of claims 1 to 6, characterized in that the method comprises the steps of:
S1, mixing and uniformly stirring the machine-made sand and the broken stone according to the formula amount, adding the cement, the slag powder, the fly ash and the silica fume according to the formula amount, and then uniformly stirring;
s2, adding water and a water reducer with the formula amount into the mixture obtained in the step S1, uniformly stirring, adding modified fiber particles, and uniformly stirring to obtain a concrete mixture;
And S3, curing the concrete mixture to obtain the low-carbon concrete.
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