CN114873942A - Pervious concrete early strength agent, pervious concrete and preparation method thereof - Google Patents
Pervious concrete early strength agent, pervious concrete and preparation method thereof Download PDFInfo
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- CN114873942A CN114873942A CN202210445046.9A CN202210445046A CN114873942A CN 114873942 A CN114873942 A CN 114873942A CN 202210445046 A CN202210445046 A CN 202210445046A CN 114873942 A CN114873942 A CN 114873942A
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- 239000011380 pervious concrete Substances 0.000 title claims abstract description 105
- 238000002360 preparation method Methods 0.000 title claims abstract description 25
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 87
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 67
- 239000004568 cement Substances 0.000 claims abstract description 37
- 229910001653 ettringite Inorganic materials 0.000 claims abstract description 26
- 239000007952 growth promoter Substances 0.000 claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 24
- 229910052602 gypsum Inorganic materials 0.000 claims abstract description 21
- 239000010440 gypsum Substances 0.000 claims abstract description 21
- 239000002994 raw material Substances 0.000 claims abstract description 21
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 15
- HXKKHQJGJAFBHI-UHFFFAOYSA-N 1-aminopropan-2-ol Chemical compound CC(O)CN HXKKHQJGJAFBHI-UHFFFAOYSA-N 0.000 claims abstract description 12
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 12
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 12
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims abstract description 12
- 239000004571 lime Substances 0.000 claims abstract description 12
- 239000002893 slag Substances 0.000 claims abstract description 12
- 239000004567 concrete Substances 0.000 claims abstract description 6
- 239000003822 epoxy resin Substances 0.000 claims description 64
- 229920000647 polyepoxide Polymers 0.000 claims description 64
- 239000005543 nano-size silicon particle Substances 0.000 claims description 54
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 54
- 239000000835 fiber Substances 0.000 claims description 52
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 52
- 229910000831 Steel Inorganic materials 0.000 claims description 48
- 239000010959 steel Substances 0.000 claims description 48
- 238000003756 stirring Methods 0.000 claims description 30
- 239000002245 particle Substances 0.000 claims description 24
- 238000002156 mixing Methods 0.000 claims description 17
- 229920005646 polycarboxylate Polymers 0.000 claims description 16
- 239000008030 superplasticizer Substances 0.000 claims description 16
- 238000000227 grinding Methods 0.000 claims description 15
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 15
- 239000004575 stone Substances 0.000 claims description 14
- 239000002002 slurry Substances 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 10
- 239000011398 Portland cement Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 7
- 239000011248 coating agent Substances 0.000 claims description 6
- 238000000576 coating method Methods 0.000 claims description 6
- 239000011163 secondary particle Substances 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 150000004683 dihydrates Chemical class 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 238000007873 sieving Methods 0.000 claims description 5
- 239000007787 solid Substances 0.000 claims description 5
- 238000009210 therapy by ultrasound Methods 0.000 claims description 5
- 238000005303 weighing Methods 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 239000006004 Quartz sand Substances 0.000 claims description 2
- 229910052925 anhydrite Inorganic materials 0.000 claims description 2
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 2
- 239000010881 fly ash Substances 0.000 claims description 2
- 239000003517 fume Substances 0.000 claims description 2
- -1 polypropylene Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 229910021487 silica fume Inorganic materials 0.000 claims description 2
- 239000004593 Epoxy Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 description 6
- 230000035699 permeability Effects 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- JHLNERQLKQQLRZ-UHFFFAOYSA-N calcium silicate Chemical compound [Ca+2].[Ca+2].[O-][Si]([O-])([O-])[O-] JHLNERQLKQQLRZ-UHFFFAOYSA-N 0.000 description 2
- 229910052918 calcium silicate Inorganic materials 0.000 description 2
- 235000012241 calcium silicate Nutrition 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- GSEJCLTVZPLZKY-UHFFFAOYSA-N Triethanolamine Chemical compound OCCN(CCO)CCO GSEJCLTVZPLZKY-UHFFFAOYSA-N 0.000 description 1
- 150000004645 aluminates Chemical class 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000006184 cosolvent Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229940080117 triethanolamine sulfate Drugs 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/024—Steam hardening, e.g. in an autoclave
-
- 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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/10—Accelerators; Activators
-
- 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
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00284—Materials permeable to liquids
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention relates to the technical field of pervious concrete, in particular to a pervious concrete early strength agent, pervious concrete and a preparation method thereof, wherein the pervious concrete early strength agent comprises the following raw materials in percentage by weight: 15-20% of monocalcium aluminate, 0.5-1% of diethanol monoisopropanolamine and 79-84.5% of ettringite growth promoter; the ettringite growth promoter is prepared from the following raw materials in parts by weight: 45-55 parts of water-quenched slag micro powder, 5-10 parts of gypsum, 3-6 parts of lime powder and 35-45 parts of water; the permeable concrete comprises the following raw materials in parts by weight: 1600-1800 parts of coarse aggregate, 370-420 parts of cement, 15-50 parts of admixture, 3-6 parts of water reducing agent, 135-155 parts of water and 1-5% of early strength agent by mass of cement; the pervious concrete early strength agent disclosed by the invention endows pervious concrete with high early strength performance, and the pervious concrete has high strength, strong toughness and excellent comprehensive performance.
Description
Technical Field
The invention relates to the technical field of pervious concrete, in particular to a pervious concrete early strength agent, pervious concrete and a preparation method thereof.
Background
The pervious concrete is a paving material developed and used by countries such as Europe, America, Japan and the like aiming at the defects of the road surface of the original urban road. The pervious concrete is formed by mixing cement-based cementitious materials and coarse aggregates, has high water permeability, cannot cause the problems of light reflection, water accumulation and the like in rainy days, provides guarantee for the safety of pedestrians during traveling, and also lightens the burden of a drainage system to a great extent. Meanwhile, the scientific application of the pervious concrete in engineering projects can make up for the defect of lack of underground water resources, effectively improve ecological balance, is beneficial to the benign development of human living environment, the management of urban rainwater, the prevention and treatment of water pollution and the like, and has special significance.
When the pervious concrete is prepared, the early strength agent is often needed to be used for improving the early strength of the pervious concrete, and the research on the early strength agent for the pervious concrete is less at present on time, so that the development of the early strength agent for the pervious concrete with excellent performance is very important for the pervious concrete.
In addition, in the engineering construction, the pervious concrete is more and more widely applied, good effect is obtained, and the problem of drainage existing in the city construction period can be effectively solved. However, in order to maximize the value and function of the pervious concrete, the formulation of the pervious concrete needs to be further optimized, so that the pervious concrete has better service performance, thereby further improving the engineering quality.
Disclosure of Invention
The invention aims to provide a pervious concrete early strength agent, pervious concrete and a preparation method thereof.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the pervious concrete early strength agent comprises the following raw materials in percentage by weight: 15-20% of monocalcium aluminate, 0.5-1% of diethanol monoisopropanolamine and 79-84.5% of ettringite growth promoter.
Preferably, the ettringite growth promoter is prepared from the following raw materials in parts by weight: 45-55 parts of water-quenched slag micro powder, 5-10 parts of gypsum, 3-6 parts of lime powder and 35-45 parts of water.
The gypsum is at least one of dihydrate gypsum, semi-hydrated gypsum and anhydrite; the dihydrate gypsum is natural gypsum or industrial by-product gypsum.
Preferably, the preparation method of the ettringite growth promoter comprises the following steps:
(1) adding water-quenched slag micro powder, gypsum, lime powder and water into a stirrer according to a ratio, uniformly stirring, and forming into a sphere with the diameter of 5-20 mm by using balling equipment;
(2) placing the spheres at 90-100 ℃ for steam curing for 10-15 hours;
(3) and (5) continuing natural curing of the steamed spheres for 5-8 days.
Preferably, the preparation method of the pervious concrete early strength agent comprises the following steps: weighing monocalcium aluminate, diethanol monoisopropanolamine and ettringite growth promoter according to the proportion, and mixing and grinding to obtain the pervious concrete early strength agent; the specific surface area of the pervious concrete early strength agent is 350-400 m 2 /kg。
As a general inventive concept, the present invention provides a pervious concrete, comprising the following raw materials in parts by weight: 1600-1800 parts of coarse aggregate, 370-420 parts of cement, 15-50 parts of admixture, 3-6 parts of water reducing agent, 135-155 parts of water and 1-5% of early strength agent by mass of cement;
the admixture comprises at least one of steel fiber, polypropylene fiber, PVA fiber, micro silica fume, quartz sand, fly ash, modified steel fiber and epoxy resin coated nano silicon carbide;
the pervious concrete early strength agent is the pervious concrete early strength agent.
Preferably, the coarse aggregate is broken stone, and the particle size of the coarse aggregate is 5-9 mm;
the cement is ordinary portland cement; in particular 42.5-grade ordinary portland cement
The admixture is prepared by mixing modified steel fiber and epoxy resin coated nano silicon carbide according to the mass ratio of 1: 0.3 to 0.5;
the polycarboxylate superplasticizer is a powdery polycarboxylate superplasticizer, and has a water reduction rate of more than 20%.
Preferably, the epoxy resin coated nano silicon carbide is a secondary particle formed by bonding and coating a plurality of nano silicon carbide particles by epoxy resin; the particle size D50 of the nano silicon carbide is 100-300 nm, and the particle size D50 of the epoxy resin coated nano silicon carbide is 30-50 mu m.
Preferably, the epoxy resin coated nano silicon carbide comprises the following steps: adding nano silicon carbide into the waterborne epoxy resin, firstly stirring and dispersing for 2-3 h, then adding a curing agent, and then stirring and dispersing for 40-60 min; and then drying the obtained slurry, and then crushing, grinding and sieving to obtain the epoxy resin coated nano silicon carbide.
The waterborne epoxy resin is Waterpoxy1422 waterborne epoxy resin or Waterpoxy1455 waterborne epoxy resin; the mass ratio of the water-based epoxy resin to the nano silicon carbide is 1: 0.1 to 0.15; the curing agent is a Waterpoxy801 curing agent; the addition amount of the curing agent is 12-15% of the mass of the waterborne epoxy resin.
Preferably, the modified steel fiber is prepared by the following method: immersing the steel fiber into silica sol, and performing ultrasonic treatment at 50-60 ℃ for 20-30 min; then taking out, drying at 130-160 ℃ for 2-3 h, roasting at 620-650 ℃ for 50-70 min, cooling to room temperature, and grinding and dispersing to obtain the modified steel fiber;
the steel fibers are smooth and straight steel fibers, the length of the steel fibers is 5-12 mm, and the length-diameter ratio of the steel fibers is 10-25; the solid content of the silica sol is 25-30%, and the particle size of the silica sol is 50-120 nm.
The preparation method of the pervious concrete comprises the following steps: mixing cement, coarse aggregate, admixture and early strength agent for 3-5 min, adding 50-60% of formula amount of water, stirring for 30-40 s, adding water reducer, stirring for 60-70 s, adding residual water, stirring for 120-150 s, and discharging to obtain the pervious concrete slurry.
The invention has the beneficial effects that:
1. in the pervious concrete early strength agent, the monocalcium aluminate is used as a dicalcium silicate hydration accelerator, the diethanol monoisopropanolamine is used as an aluminum-phase cosolvent, and after the two substances are matched with the ettringite growth promoter, the dissolution of a cement aluminate phase, the generation of ettringite and the hydration of dicalcium silicate in cement can be effectively accelerated, so that the pervious concrete is endowed with high early strength performance, and the pervious concrete early strength agent is suitable for low-temperature construction of pervious pavements, construction of early open traffic pervious pavements and construction of pervious concrete pavements with special requirements on early strength.
2. The ettringite growth promoter comprises water-quenched slag micro powder, gypsum and lime powder which are matched to promote ettringite hydrated minerals to be generated in silicate cement, so that the properties of rapid setting, rapid hardening, micro-expansion, low shrinkage and the like of the pervious concrete are further improved, the early strength and the late strength of the pervious concrete are effectively improved, and the crack resistance of the pervious concrete can be improved.
3. When the pervious concrete is prepared, the formula amounts of the coarse aggregate, the cement, the admixture, the water reducing agent, the water and the early strength agent are reasonably configured, so that the prepared pervious concrete can keep higher strength, porosity and the like.
4. According to the invention, the epoxy resin coated nano silicon carbide is added during the preparation of the pervious concrete, and is secondary particles formed by bonding and coating a plurality of nano silicon carbide particles by the epoxy resin, and the epoxy resin coated nano silicon carbide is easy to disperse, so that the nano silicon carbide can be highly dispersed in the pervious concrete, the strength of the pervious concrete is effectively enhanced, and meanwhile, the compressive strength, the flexural strength and the like of the concrete can be effectively improved by the epoxy resin.
5. The modified steel fibers are added when the pervious concrete is prepared, the silicon oxide layer is formed on the surfaces of the steel fibers in the modified steel fibers, the modified steel fibers have certain roughness, the bonding degree between the steel fibers and a matrix material can be enhanced, and the bonding force of an interface is enhanced.
6. The permeable concrete slurry is used for preparing the permeable pavement, the construction is convenient, the surface of the obtained permeable pavement is uniform, the continuous porous structural pavement can be formed, the water accumulation phenomenon of roads and squares can be eliminated quickly in rainy days, the strength is high, the toughness is strong, the comprehensive performance is excellent, and the value and the effect of the permeable concrete can be effectively exerted.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the pervious concrete early strength agent comprises the following raw materials in percentage by weight: 18 percent of monocalcium aluminate, 0.8 percent of diethanol monoisopropanolamine and 81.2 percent of ettringite growth promoter.
The ettringite growth promoter is prepared from the following raw materials in parts by weight: 50 parts of water-quenched slag micro powder, 10 parts of semi-hydrated gypsum, 5 parts of lime powder and 45 parts of water.
The preparation method of the ettringite growth promoter comprises the following steps:
(1) adding water-quenched slag micro powder, semi-hydrated gypsum, lime powder and water into a stirrer according to a ratio, uniformly stirring, and forming into a sphere with the diameter of 5-20 mm by using a balling device;
(2) placing the spheres at 100 ℃ for steam curing for 13 hours;
(3) and (5) continuing natural curing of the steamed spheres for 7 d.
The preparation method of the pervious concrete early strength agent comprises the following steps: weighing monocalcium aluminate, diethanol monoisopropanolamine and ettringite growth promoter according to the proportion, and mixing and grinding to obtain the pervious concrete early strength agent; the specific surface area of the pervious concrete early strength agent is 385m 2 /kg。
Example 2:
the pervious concrete early strength agent comprises the following raw materials in percentage by weight: 20% of monocalcium aluminate, 1% of diethanol monoisopropanolamine and 79% of ettringite growth promoter.
The ettringite growth promoter is prepared from the following raw materials in parts by weight: 45 parts of water-quenched slag micro powder, 8 parts of semi-hydrated gypsum, 6 parts of lime powder and 42 parts of water.
The preparation method of the ettringite growth promoter comprises the following steps:
(1) adding water-quenched slag micro powder, semi-hydrated gypsum, lime powder and water into a stirrer according to a ratio, uniformly stirring, and forming into a sphere with the diameter of 5-20 mm by using a balling device;
(2) placing the spheres at 100 ℃ for steam curing for 15 hours;
(3) and (5) continuing natural curing of the steamed spheres for 5 days.
The preparation method of the pervious concrete early strength agent comprises the following steps: weighing monocalcium aluminate, diethanol monoisopropanolamine and ettringite growth promoter according to the proportion, and mixing and grinding to obtain the pervious concrete early strength agent; the specific surface area of the pervious concrete early strength agent is 356m 2 /kg。
Example 3:
the pervious concrete early strength agent comprises the following raw materials in percentage by weight: 15 percent of monocalcium aluminate, 0.5 percent of diethanol monoisopropanolamine and 84.5 percent of ettringite growth promoter.
The ettringite growth promoter is prepared from the following raw materials in parts by weight: 55 parts of water-quenched slag micro powder, 5 parts of natural dihydrate gypsum, 3 parts of lime powder and 35 parts of water.
The preparation method of the ettringite growth promoter comprises the following steps:
(1) adding the water-quenched slag micro powder, the natural dihydrate gypsum, the lime powder and water into a stirrer according to a ratio, uniformly stirring, and molding into a sphere with the diameter of 5-20 mm by using a balling device;
(2) placing the spheres at 90 ℃ for steam curing for 10 hours;
(3) and (5) continuing natural curing of the steamed spheres for 8 days.
The preparation method of the pervious concrete early strength agent comprises the following steps: weighing calcium aluminate according to the proportion,Mixing and grinding the diethanol monoisopropanolamine and the ettringite growth promoter to obtain the pervious concrete early strength agent; the specific surface area of the pervious concrete early strength agent is 398m 2 /kg。
Example 4:
the pervious concrete comprises the following raw materials in parts by weight: the cement early strength agent comprises 1720 parts of coarse aggregate, 405 parts of cement, 42 parts of admixture, 5 parts of water reducing agent, 145 parts of water and 3% of early strength agent by mass of cement.
The coarse aggregate is crushed stone, and the particle size of the crushed stone is 5-9 mm; the cement is 42.5-grade ordinary portland cement; the polycarboxylate superplasticizer is a powdery polycarboxylate superplasticizer, and has a water reduction rate of more than 20 percent; the admixture is steel fiber, the steel fiber is smooth and straight steel fiber, the length is 5-12 mm, and the length-diameter ratio is 10-25; the early strength agent is the pervious concrete early strength agent prepared in example 1.
The preparation method of the pervious concrete comprises the following steps: mixing cement, coarse aggregate, admixture and early strength agent for 5min, adding 50% of formula amount of water, stirring for 30s, adding water reducing agent, stirring for 60s, adding residual water, stirring for 120s, and discharging to obtain the pervious concrete slurry.
Example 5:
the pervious concrete comprises the following raw materials in parts by weight: the cement early strength agent comprises 1720 parts of coarse aggregate, 405 parts of cement, 42 parts of admixture, 5 parts of water reducing agent, 145 parts of water and 3% of early strength agent by mass of cement.
The coarse aggregate is broken stone, and the particle size of the broken stone is 5-9 mm; the cement is 42.5-grade ordinary portland cement; the admixture is prepared by mixing modified steel fiber and epoxy resin coated nano silicon carbide according to the mass ratio of 1: 0.5; the polycarboxylate superplasticizer is a powdery polycarboxylate superplasticizer, and has a water reduction rate of more than 20%. The early strength agent is the pervious concrete early strength agent prepared in example 1.
The epoxy resin coated nano silicon carbide is a secondary particle formed by bonding and coating a plurality of nano silicon carbide particles by epoxy resin; the grain diameter D50 of the nano silicon carbide is 220nm, and the grain diameter D50 of the epoxy resin coated nano silicon carbide is 40 μm.
The epoxy resin coated nano silicon carbide comprises the following steps: adding nano silicon carbide into the waterborne epoxy resin, firstly stirring and dispersing for 3 hours, then adding the curing agent, and then stirring and dispersing for 50 min; and then drying the obtained slurry, and then crushing, grinding and sieving to obtain the epoxy resin coated nano silicon carbide. Wherein the waterborne epoxy resin is Waterpoxy1422 waterborne epoxy resin; the mass ratio of the water-based epoxy resin to the nano silicon carbide is 1: 0.15; the curing agent is Waterpoxy801 curing agent, and the addition amount of the curing agent is 15 percent of the mass of the waterborne epoxy resin.
The modified steel fiber is prepared by the following method: immersing steel fiber into silica sol, and performing ultrasonic treatment at 58 ℃ for 30 min; and then taking out, drying at 160 ℃ for 3h, roasting at 630 ℃ for 70min, cooling to room temperature, and grinding and dispersing to obtain the modified steel fiber. Wherein the steel fiber is smooth and straight steel fiber, the length is 5-12 mm, and the length-diameter ratio is 10-25; the solid content of the silica sol is 28%, and the particle size of the silica sol is 50-120 nm.
The preparation method of the pervious concrete is the same as that of example 4.
Example 6:
the pervious concrete comprises the following raw materials in parts by weight: 1800 parts of coarse aggregate, 370 parts of cement, 15 parts of admixture, 6 parts of water reducing agent, 135 parts of water and 2% of early strength agent by mass of cement.
The coarse aggregate is broken stone, and the particle size of the broken stone is 5-9 mm; the cement is 42.5-grade ordinary portland cement; the admixture is prepared by mixing modified steel fiber and epoxy resin coated nano silicon carbide according to the mass ratio of 1: 0.3; the polycarboxylate superplasticizer is a powdery polycarboxylate superplasticizer, and has a water reduction rate of more than 20%. The early strength agent is the pervious concrete early strength agent prepared in example 3.
The epoxy resin coated nano silicon carbide is a secondary particle formed by bonding and coating a plurality of nano silicon carbide particles by epoxy resin; the grain diameter D50 of the nano silicon carbide is 295nm, and the grain diameter D50 of the epoxy resin coated nano silicon carbide is 48 mu m.
The epoxy resin coated nano silicon carbide comprises the following steps: adding nano silicon carbide into the waterborne epoxy resin, firstly stirring and dispersing for 2 hours, then adding the curing agent, and then stirring and dispersing for 60 min; and then drying the obtained slurry, and then crushing, grinding and sieving to obtain the epoxy resin coated nano silicon carbide. Wherein the waterborne epoxy resin is Waterpoxy1422 waterborne epoxy resin; the mass ratio of the water-based epoxy resin to the nano silicon carbide is 1: 0.12; the curing agent is Waterpoxy801 curing agent, and the addition amount of the curing agent is 12 percent of the mass of the waterborne epoxy resin.
The modified steel fiber is prepared by the following method: immersing steel fiber into silica sol, and performing ultrasonic treatment at 50 ℃ for 20 min; and then taking out, drying at 130 ℃ for 2.5h, roasting at 650 ℃ for 50min, cooling to room temperature, and grinding and dispersing to obtain the modified steel fiber. Wherein the steel fiber is smooth and straight steel fiber, the length is 5-12 mm, and the length-diameter ratio is 10-25; the solid content of the silica sol is 25%, and the particle size of the silica sol is 50-120 nm.
The preparation method of the pervious concrete comprises the following steps: mixing cement, coarse aggregate, admixture and early strength agent for 3min, adding 60% formula amount of water, stirring for 30s, adding water reducing agent, stirring for 70s, adding residual water, stirring for 120s, and discharging to obtain the pervious concrete slurry.
Example 7:
the pervious concrete comprises the following raw materials in parts by weight: 1600 parts of coarse aggregate, 420 parts of cement, 50 parts of admixture, 3 parts of water reducing agent, 155 parts of water and an early strength agent accounting for 5% of the mass of the cement.
The coarse aggregate is broken stone, and the particle size of the broken stone is 5-9 mm; the cement is 42.5-grade ordinary portland cement; the admixture is prepared by mixing modified steel fiber and epoxy resin coated nano silicon carbide according to the mass ratio of 1: 0.4; the polycarboxylate superplasticizer is a powdery polycarboxylate superplasticizer, and has a water reduction rate of more than 20%. The early strength agent is the pervious concrete early strength agent prepared in example 2.
The epoxy resin coated nano silicon carbide is a secondary particle formed by bonding and coating a plurality of nano silicon carbide particles by epoxy resin; the grain diameter D50 of the nano silicon carbide is 100nm, and the grain diameter D50 of the epoxy resin coated nano silicon carbide is 30 μm.
The epoxy resin coated nano silicon carbide comprises the following steps: adding nano silicon carbide into the waterborne epoxy resin, firstly stirring and dispersing for 3 hours, then adding the curing agent, and then stirring and dispersing for 40 min; and then drying the obtained slurry, and then crushing, grinding and sieving to obtain the epoxy resin coated nano silicon carbide. Wherein the water-based epoxy resin is Waterpoxy1455 water-based epoxy resin; the mass ratio of the water-based epoxy resin to the nano silicon carbide is 1: 0.1; the curing agent is Waterpoxy801 curing agent, and the addition amount of the curing agent is 13 percent of the mass of the waterborne epoxy resin.
The modified steel fiber is prepared by the following method: immersing steel fiber into silica sol, and performing ultrasonic treatment at 60 ℃ for 30 min; and then taking out, drying at 150 ℃ for 2-3 h, roasting at 620 ℃ for 60min, cooling to room temperature, and grinding and dispersing to obtain the modified steel fiber. Wherein the steel fiber is smooth and straight steel fiber, the length is 5-12 mm, and the length-diameter ratio is 10-25; the solid content of the silica sol is 30%, and the particle size of the silica sol is 50-120 nm.
The preparation method of the pervious concrete comprises the following steps: mixing cement, coarse aggregate, admixture and early strength agent for 3min, adding 50% of formula amount of water, stirring for 40s, adding water reducing agent, stirring for 65s, adding residual water, stirring for 150s, and discharging to obtain the pervious concrete slurry.
Example 8:
the pervious concrete comprises the following raw materials in parts by weight: 1680 parts of coarse aggregate, 390 parts of cement, 35 parts of admixture, 4.5 parts of water reducing agent, 145 parts of water and early strength agent accounting for 3% of the mass of the cement.
The early strength agent is the pervious concrete early strength agent prepared in the embodiment 2; the coarse aggregate is broken stone, and the particle size of the broken stone is 5-9 mm; the cement is 42.5-grade ordinary portland cement; the polycarboxylate superplasticizer is a powdery polycarboxylate superplasticizer, and has a water reduction rate of more than 20%.
The admixture is prepared by mixing modified steel fiber and epoxy resin coated nano silicon carbide according to the mass ratio of 1: 0.4; the preparation method of the epoxy resin coated nano silicon carbide and modified steel fiber is the same as that of example 7.
The preparation method of the pervious concrete is the same as that of example 7.
Example 9:
the pervious concrete comprises the following raw materials in parts by weight: 1680 parts of coarse aggregate, 390 parts of cement, 35 parts of admixture, 4.5 parts of water reducing agent, 145 parts of water and early strength agent accounting for 3% of the mass of the cement.
The early strength agent is the pervious concrete early strength agent prepared in the embodiment 2; the coarse aggregate is broken stone, and the particle size of the broken stone is 5-9 mm; the cement is 42.5-grade ordinary portland cement; the polycarboxylate superplasticizer is a powdery polycarboxylate superplasticizer, and has a water reduction rate of more than 20%.
The admixture is modified steel fiber, and the preparation method of the modified steel fiber is the same as that of the example 7. The preparation method of the pervious concrete is the same as that of example 7.
Comparative example 1:
different from the embodiment 4, the pervious concrete adopts the early strength agent prepared from triethanolamine and aluminum sulfate according to the mass ratio of 1: 1.
And (3) performance testing:
and (3) carrying out performance detection on the pervious concrete prepared in the examples 4-9 and the pervious concrete prepared in the comparative example 1.
(1) The compressive strength and the flexural strength of each pervious concrete were measured, and the specific measurement results are shown in table 1.
TABLE 1 Strength test results
(2) The concrete test results of the 28d water permeability coefficient, porosity and frost resistance of each pervious concrete are shown in table 2.
TABLE 2 Performance test results
As shown in tables 1 and 2, the pervious concrete prepared by the method has high early strength and high late strength, and particularly, when the modified steel fibers and the epoxy resin coated nano silicon carbide are used as an admixture, the strength of the pervious concrete is further improved. In addition, the pervious concrete prepared by the invention has excellent water permeability and frost resistance.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The pervious concrete early strength agent is characterized by comprising the following raw materials in percentage by weight: 15-20% of monocalcium aluminate, 0.5-1% of diethanol monoisopropanolamine and 79-84.5% of ettringite growth promoter.
2. The pervious concrete early strength agent of claim 1, wherein the ettringite growth promoter is prepared from the following raw materials in parts by weight: 45-55 parts of water-quenched slag micro powder, 5-10 parts of gypsum, 3-6 parts of lime powder and 35-45 parts of water.
The gypsum is at least one of dihydrate gypsum, semi-hydrated gypsum and anhydrite.
3. The pervious concrete early strength agent of claim 2, wherein the preparation method of the ettringite growth promoter comprises the following steps:
(1) adding water-quenched slag micro powder, gypsum, lime powder and water into a stirrer according to a ratio, uniformly stirring, and forming into a sphere with the diameter of 5-20 mm by using balling equipment;
(2) placing the spheres at 90-100 ℃ for steam curing for 10-15 hours;
(3) and (5) continuing natural curing of the steamed spheres for 5-8 days.
4. The pervious concrete early strength agent according to any one of claims 1-3, wherein the preparation method of the pervious concrete early strength agent comprises the following steps: weighing monocalcium aluminate, diethanol monoisopropanolamine and ettringite growth promoter according to the proportion, and mixing and grinding to obtain the pervious concrete early strength agent; the specific surface area of the pervious concrete early strength agent is 350-400 m 2 /kg。
5. The pervious concrete is characterized by comprising the following raw materials in parts by weight: 1600-1800 parts of coarse aggregate, 370-420 parts of cement, 15-50 parts of admixture, 3-6 parts of water reducing agent, 135-155 parts of water and 1-5% of early strength agent by mass of cement;
the admixture comprises at least one of steel fiber, polypropylene fiber, PVA fiber, micro silica fume, quartz sand, fly ash, modified steel fiber and epoxy resin coated nano silicon carbide;
the pervious concrete early strength agent as claimed in any one of claims 1-4.
6. The pervious concrete of claim 5, wherein the coarse aggregate is crushed stone, and the particle size of the coarse aggregate is 5-9 mm;
the cement is ordinary portland cement;
the admixture is prepared by mixing modified steel fiber and epoxy resin coated nano silicon carbide according to the mass ratio of 1: 0.3 to 0.5;
the polycarboxylate superplasticizer is a powdery polycarboxylate superplasticizer, and has a water reduction rate of more than 20%.
7. The pervious concrete of claim 5, wherein said epoxy-coated nano-silicon carbide is a secondary particle formed by epoxy-bonded coated multi-particle nano-silicon carbide particles; the particle size D50 of the nano silicon carbide is 100-300 nm, and the particle size D50 of the epoxy resin coated nano silicon carbide is 30-50 mu m.
8. The pervious concrete of claim 7, wherein said epoxy resin coating nano silicon carbide comprises the steps of: adding nano silicon carbide into the waterborne epoxy resin, firstly stirring and dispersing for 2-3 h, then adding a curing agent, and then stirring and dispersing for 40-60 min; and then drying the obtained slurry, and then crushing, grinding and sieving to obtain the epoxy resin coated nano silicon carbide.
The waterborne epoxy resin is Waterpoxy1422 waterborne epoxy resin or Waterpoxy1455 waterborne epoxy resin; the mass ratio of the water-based epoxy resin to the nano silicon carbide is 1: 0.1 to 0.15; the curing agent is a Waterpoxy801 curing agent; the addition amount of the curing agent is 12-15% of the mass of the waterborne epoxy resin.
9. The pervious concrete of claim 5, characterized in that said modified steel fibers are prepared by the following method: immersing the steel fiber into silica sol, and performing ultrasonic treatment at 50-60 ℃ for 20-30 min; taking out, drying at 130-160 ℃ for 2-3 h, roasting at 620-650 ℃ for 50-70 min, cooling to room temperature, and grinding and dispersing to obtain the modified steel fiber;
the steel fiber is smooth and straight, the length is 5-12 mm, and the length-diameter ratio is 10-25; the solid content of the silica sol is 25-30%, and the particle size of the silica sol is 50-120 nm.
10. The method for preparing the pervious concrete according to any one of claims 5 to 9, characterized by comprising the following steps: mixing cement, coarse aggregate, admixture and early strength agent for 3-5 min, adding 50-60% of formula amount of water, stirring for 30-40 s, adding water reducer, stirring for 60-70 s, adding residual water, stirring for 120-150 s, and discharging to obtain the concrete slurry.
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| CN109111143A (en) * | 2018-08-16 | 2019-01-01 | 武汉理工大学 | A kind of drated calcium aluminate nanocrystal early strength agent and preparation method thereof |
| CN111875284A (en) * | 2020-08-11 | 2020-11-03 | 河北省建筑科学研究院有限公司 | Permeable concrete reinforcing agent and preparation method and application thereof |
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| JP2002226254A (en) * | 2001-01-25 | 2002-08-14 | Taiheiyo Cement Corp | Quick hardening type water permeable concrete |
| CN103145368A (en) * | 2013-03-07 | 2013-06-12 | 北京新奥混凝土集团有限公司 | Early-strength water reducer for recycled aggregate concrete |
| CN107098637A (en) * | 2017-04-07 | 2017-08-29 | 山东大学 | A kind of novel ecological pervious concrete material and preparation method thereof |
| CN109111143A (en) * | 2018-08-16 | 2019-01-01 | 武汉理工大学 | A kind of drated calcium aluminate nanocrystal early strength agent and preparation method thereof |
| CN111875284A (en) * | 2020-08-11 | 2020-11-03 | 河北省建筑科学研究院有限公司 | Permeable concrete reinforcing agent and preparation method and application thereof |
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