CN115466089A - High-strength pervious concrete and preparation method thereof - Google Patents
High-strength pervious concrete and preparation method thereof Download PDFInfo
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- CN115466089A CN115466089A CN202211148827.8A CN202211148827A CN115466089A CN 115466089 A CN115466089 A CN 115466089A CN 202211148827 A CN202211148827 A CN 202211148827A CN 115466089 A CN115466089 A CN 115466089A
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- 239000011380 pervious concrete Substances 0.000 title claims abstract description 120
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 239000000463 material Substances 0.000 claims abstract description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 65
- 229910052582 BN Inorganic materials 0.000 claims abstract description 61
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 61
- 229920002748 Basalt fiber Polymers 0.000 claims abstract description 38
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 23
- 238000003756 stirring Methods 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000000465 moulding Methods 0.000 claims abstract description 6
- 230000008569 process Effects 0.000 claims abstract description 4
- 239000000203 mixture Substances 0.000 claims description 33
- 239000004568 cement Substances 0.000 claims description 26
- 239000004567 concrete Substances 0.000 claims description 13
- 239000010881 fly ash Substances 0.000 claims description 10
- 229910021487 silica fume Inorganic materials 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052799 carbon Inorganic materials 0.000 claims description 5
- 238000005056 compaction Methods 0.000 claims description 5
- 238000011049 filling Methods 0.000 claims description 5
- 238000012423 maintenance Methods 0.000 claims description 5
- 239000003755 preservative agent Substances 0.000 claims description 5
- 230000002335 preservative effect Effects 0.000 claims description 5
- 239000002245 particle Substances 0.000 claims description 4
- 239000011398 Portland cement Substances 0.000 claims description 3
- 239000002994 raw material Substances 0.000 abstract description 9
- 229920006253 high performance fiber Polymers 0.000 abstract description 3
- 230000001050 lubricating effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 8
- 238000005452 bending Methods 0.000 description 7
- 230000035699 permeability Effects 0.000 description 6
- 239000000654 additive Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000000996 additive effect Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 206010039203 Road traffic accident Diseases 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 239000002956 ash Substances 0.000 description 1
- 239000005442 atmospheric precipitation Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
- 230000001502 supplementing effect Effects 0.000 description 1
- 239000002344 surface layer Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000011041 water permeability test 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
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
- C04B38/0038—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by superficial sintering or bonding of particulate matter
- C04B38/0041—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof by superficial sintering or bonding of particulate matter the particulate matter having preselected particle sizes
-
- 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
- C04B2111/00241—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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/0075—Uses not provided for elsewhere in C04B2111/00 for road construction
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/40—Porous or lightweight materials
-
- 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)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The invention discloses a high-strength pervious concrete and a preparation method thereof, wherein the preparation method comprises the following steps: preparing coarse aggregate, fine aggregate, a water reducing agent, a cementing material, hexagonal boron nitride, basalt fiber and water according to parts by weight; (2) mixing: firstly, premixing coarse aggregate, fine aggregate and 10% of water, adding a cementing material into a premixing material after premixing, and adding basalt fiber in the stirring process; then, stirring the remaining water, the water reducing agent and the hexagonal boron nitride; (3) molding in a mold; and (4) curing. The raw materials of the invention are added with the hexagonal boron nitride and the basalt fiber, and the hexagonal boron nitride has good lubricating property, so that the viscosity of the cementing material can be obviously increased, and the aggregate and the cementing material are tightly combined, thereby improving the compressive strength of the pervious concrete; the basalt fiber is a novel high-performance fiber, and can be added into pervious concrete to solve the problem of cracks caused by brittleness, so that the compressive strength of the pervious concrete is enhanced.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to high-strength pervious concrete and a preparation method thereof.
Background
The pervious concrete mainly comprises natural aggregate, a cement base material, an additive, an admixture and the like, wherein the volume of the cement base material, the additive and the admixture is smaller than that of a gap between the aggregates, so that the concrete can be communicated with the gap to achieve the pervious effect, and the porosity of the pervious concrete is generally 15-25%. Researches find that the gap inside the pervious concrete is not only a channel for water, but also has the functions of cleaning water quality, absorbing sound, reducing noise, relieving heat island effect and the like. The vehicle goes "floats smoothly" in the road surface of ponding easily to ponding, and the ponding on road surface also can take place "splash", blocks the back car sight, very easily takes place the incident, and the pavement ponding can be eliminated in the pavement of permeable pavement, is favorable to resident's trip, reduces the traffic accident, and the application of guarantee resident traffic trip safety permeable concrete can improve driving safety.
The pervious concrete is applied to paving of pervious pavements and has the following important significance:
(1) Urban waterlogging is reduced and groundwater replenishment is realized; in recent years, a plurality of large and medium-sized cities in China frequently encounter inland water logging disasters, and serious casualties and property loss are caused. In addition, as the urban greening coverage rate is reduced, atmospheric precipitation cannot timely and effectively permeate into soil to supplement underground water, and the underground water resource mining and supplementing balance is seriously damaged. Therefore, the permeable pavement of urban roads, parking lots, sidewalks, residential areas and garden roads is a very important way for eliminating urban waterlogging and realizing the recycling of underground water;
(2) The urban heat island effect is relieved, and urban diseases are effectively prevented; the urban construction develops an obvious negative effect at a high speed, and the effect is an increasingly obvious urban heat island effect. The recycled aggregate pervious concrete is applied to paving of the pervious pavement, so that the air permeability of the ground surface can be enhanced, the heat island effect can be relieved, and the comfort level of urban living can be increased.
CJJ/T135-2009 permeable cement concrete pavement technical regulations require that the minimum strength grade of permeable concrete of a road surface layer is C20, the bending tensile strength is more than 2.5MPa, the permeability coefficient is more than 0.5mm/s, and the communication porosity is more than 10%. As the pervious concrete has a large number of gaps, the mechanical properties (compression resistance and bending and tensile resistance) of the pervious concrete are greatly reduced compared with that of the ordinary concrete. At the present stage, the compressive strength and the bending tensile strength of the common pervious concrete are lower, the compressive strength can only reach dozens of megapascals, and the standard requirement is difficult to reach.
Disclosure of Invention
The invention provides high-strength pervious concrete and a preparation method thereof, and effectively solves the technical problems of poor compressive strength, low bending tensile strength and the like of common pervious concrete.
The invention provides high-strength pervious concrete which is prepared from the following raw materials in parts by weight: the material comprises, by weight, 1375.9-1681.7 parts of coarse aggregate, 74.3-88.6 parts of fine aggregate, 2.76-3.34 parts of a water reducing agent, 335.2-365.6 parts of a cementing material, 0.2432-0.3648 part of hexagonal boron nitride and 95.76-104.88 parts of water.
Preferably, the particle size of the hexagonal boron nitride is 6.5-7.5 μm, the carbon content is 0.0185-0.0285%, and the purity of the hexagonal boron nitride is more than or equal to 99%.
Preferably, 1528.8 parts of coarse aggregate, 80.5 parts of fine aggregate, 3.04 parts of water reducing agent, 350.4 parts of cementing material, 0.304 part of hexagonal boron nitride and 100.32 parts of water, wherein the grain diameter of the hexagonal boron nitride is 7.04 mu m, the carbon content is 0.0235% and the purity is 99%.
Preferably, the particle size of the coarse aggregate is 5-10mm, and the fineness modulus of the fine aggregate is 2.5.
Preferably, the cementing material comprises cement, fly ash and silica fume.
Preferably, the cement is P.042.5 ordinary portland cement, the cement accounts for 83.15-90.69% by mass of the cementing material, the fly ash accounts for 4.53-12.47% by mass of the cementing material, and the silica fume accounts for 4.38-4.78% by mass of the cementing material.
Further preferably, the basalt fiber-containing fiber composite material comprises 0.304-0.912 part of basalt fiber.
Preferably, the basalt fiber has a diameter of 16-22 μm, a density of 2.7 g/cm, a tensile strength of 4300MPa, a breaking strength of 3200MPa, an elastic modulus of 89 Gpa and an elongation at break of 3.2%.
The invention provides a preparation method of the high-strength pervious concrete, which comprises the following steps:
(1) Preparing materials: preparing coarse aggregate, fine aggregate, a water reducing agent, a cementing material, hexagonal boron nitride and water according to parts by weight;
(2) Stirring: firstly, adding coarse aggregate, fine aggregate and 10% of water into a stirrer for premixing; after the premixing is finished, adding the cementing material into the premixing material, so that the cementing material is uniformly wrapped on the shell of the aggregate; then, adding the remaining 90% of water, the water reducing agent and the hexagonal boron nitride into a stirrer for stirring to obtain a pervious concrete mixture;
(3) Molding: filling the pervious concrete mixture obtained in the step (2) into a mould twice, wherein the quantity of the pervious concrete mixture filled into the mould for the first time is more than or equal to 2/3 of the volume quantity of the mould, compacting the pervious concrete mixture in the mould after the pervious concrete mixture is filled into the mould for the first time, then continuously compacting the rest pervious concrete mixture, and standing still for 48 hours in the mould after the compaction is finished to obtain a pervious concrete formed part, wherein the surface of the pervious concrete formed part needs to be covered by a preservative film, so that the water loss is reduced;
(4) And (5) maintenance: and (4) removing the mold of the pervious concrete forming part obtained in the step (3), and curing for 7 days or 28 days to obtain the pervious concrete.
The invention provides a preparation method of the high-strength pervious concrete, which is characterized by comprising the following steps: the method comprises the following steps:
(1) Preparing materials: preparing coarse aggregate, fine aggregate, a water reducing agent, a cementing material, hexagonal boron nitride and water according to parts by weight;
(2) Stirring: firstly, adding coarse aggregate, fine aggregate and 10% of water into a stirrer for premixing; after the pre-mixing is finished, adding a cementing material into the pre-mixed material, so that the cementing material is uniformly wrapped on a shell of the aggregate, and adding basalt fibers in the stirring process; then, adding the remaining 90% of water, the water reducing agent and the hexagonal boron nitride into a stirrer for stirring to obtain a pervious concrete mixture;
(3) Molding: filling the pervious concrete mixture obtained in the step (2) into a mould twice, wherein the quantity of the pervious concrete mixture filled into the mould for the first time is more than or equal to 2/3 of the volume quantity of the mould, compacting the pervious concrete mixture in the mould after the pervious concrete mixture is filled into the mould for the first time, then continuously compacting the rest pervious concrete mixture, and standing still for 48 hours in the mould after the compaction is finished to obtain a pervious concrete formed part, wherein the surface of the pervious concrete formed part needs to be covered by a preservative film, so that the water loss is reduced;
(4) And (5) maintenance: and (4) removing the mold of the pervious concrete formed part obtained in the step (3), and curing for 7 days or 28 days to obtain the pervious concrete.
Compared with the prior art, the invention has the beneficial effects that: the invention provides a high-strength pervious concrete and a preparation method thereof, by the mutual synergistic effect of hexagonal boron nitride and basalt fiber, the 28-day compressive strength expansion amplitude of the pervious concrete is 7.49-28.88%, the 28-day bending tensile strength expansion amplitude is 1.39-19.68%, the same 28-day bending tensile strength expansion amplitude is 1.39-19.68%, and the 28-day permeability coefficient expansion amplitude is 19.0-42.18%, so that the requirements of CJJ/T135-2009 permeable cement concrete pavement technical specifications on road surface pervious concrete are met, the manufacturing cost is low, and the industrial application is easy.
By adding the hexagonal boron nitride into the high-strength pervious concrete raw material, the hexagonal boron nitride has good lubricating property, so that the viscosity of the cementing material can be obviously increased, and the aggregate is tightly combined with the cementing material, so that the compressive strength of the pervious concrete is improved, and the cost of the hexagonal boron nitride is low, so that the manufacturing cost can be saved; the basalt fiber is a novel high-performance fiber, has the advantages of low cost, greenness, harmlessness and the like, can be bridged in the pervious concrete, solves the problem of cracks caused by brittleness, and further enhances the compressive strength of the pervious concrete.
Detailed Description
In order to explain the technical solution of the present invention in detail, the technical solution of the embodiment of the present invention will be clearly and completely described below. It should be apparent that the described embodiments are only some of the embodiments of the present invention, and not all of them. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without inventive step, are within the scope of protection of the invention.
The invention mainly relates to two additives, namely hexagonal boron nitride and basalt fiber, which can be applied to the high-strength permeable concrete, wherein the grain diameter of the hexagonal boron nitride is 6.5-7.5 mu m, the carbon content is 0.0185-0.0285%, the purity is more than or equal to 99%, and preferably, the basic index information of the hexagonal boron nitride and the basalt fiber adopted in the following embodiments is shown in tables 1 and 2.
TABLE 1 hexagonal boron nitride Performance index
TABLE 2 basalt fiber Performance index
| Diameter/. Mu.m | Density of(g/cm 3 ） | Tensile strength/MPa | Breaking strength/MPa | Modulus of elasticity/GPa | Elongation at break/% |
| 16~22 | 2.7 | 4200 | 3200 | 89 | 3.2 |
TABLE 3 pervious concrete mix proportion examples
Example 1
The high-strength pervious concrete and the preparation method thereof are as follows:
(1) Preparing materials: preparing coarse aggregate, fine aggregate, water reducing agent and cementing material according to parts by weight, wherein the particle size of the coarse aggregate is 5-10mm, the fineness modulus of the fine aggregate is 2.5, and the specific mixing proportion is 1375.9 to 1681.7kg/m 3 74.3 to 88.6kg/m of the coarse aggregate 3 2.76 to 3.34kg/m 3 335.2kg/m of water reducing agent 3 ~365.6 kg/m 3 In this example, the concrete mixing ratio of (A) is 1528.8kg/m 3 80.5kg/m of coarse aggregate 3 3.04kg/m of fine aggregate 3 350.4kg/m of water reducing agent 3 The cement of (2) has a target porosity of 15% and a water/cement ratio of 0.3, preferably 100.32kg/m in this example 3 Water of (2);
(2) Mixing: firstly, adding coarse aggregate, fine aggregate and 10% of water into a stirrer for premixing; after the pre-mixing is finished, adding a cementing material into the pre-mixing material to enable the cementing material to be uniformly wrapped on the shell of the aggregate, wherein the cementing material comprises P.042.5 ordinary portland cement, fly ash and silica fume, in the cementing material, the cement accounts for 83.15-90.69% of the mass of the cementing material, the fly ash accounts for 4.53-12.47% of the mass of the cementing material, and the silica fume accounts for 4.38-4.78% of the mass of the cementing material, in the embodiment, the cement accounts for 86.76% of the mass of the cementing material, the fly ash accounts for 8.67% of the mass of the cementing material, and the silica fume accounts for 3.04% of the mass of the cementing material; finally, adding the remaining 90% of water and the water reducing agent into a stirrer for stirring to obtain a pervious concrete mixture;
(3) Molding: filling the pervious concrete mixture obtained in the step (2) into a mould twice, wherein the quantity of the pervious concrete mixture filled into the mould for the first time is more than or equal to 2/3 of the volume quantity of the mould, compacting the pervious concrete mixture in the mould after the pervious concrete mixture is filled into the mould for the first time, then continuously compacting the rest pervious concrete mixture, and standing still for 48 hours in the mould after the compaction is finished to obtain a pervious concrete formed part, wherein the surface of the pervious concrete formed part needs to be covered by a preservative film, so that the water loss is reduced;
(4) And (3) maintenance: and (4) removing the mold of the pervious concrete forming part obtained in the step (3), and curing for 7 days or 28 days to obtain the pervious concrete.
This example is ordinary aggregate pervious concrete as a comparative example in the examples of the present invention.
Example 2
The difference from the embodiment 1 is that the raw materials are selected differently, and the specific ratio of the raw materials is as follows: 1375.9kg/m 3 74.3kg/m of coarse aggregate 3 2.76kg/m of fine aggregate 3 335.2kg/m water reducing agent 3 95.96kg/m of the cementitious material of (1) 3 The water of (2).
This example is a general aggregate pervious concrete as a comparative example in the examples of the present invention.
Example 3
The difference from the embodiment 1 is that the raw materials are selected differently in proportion, and the specific proportion of the raw materials is as follows: 1681.7kg/m 3 88.6kg/m of coarse aggregate 3 Of (2) a fine aggregate、3.34kg/m 3 365.6kg/m of water reducing agent 3 104.88kg/m of cement 3 The water of (2).
This example is ordinary aggregate pervious concrete as a comparative example in the examples of the present invention.
Example 4
The difference from example 1 is that hexagonal boron nitride is added to the raw material, the weight fraction of hexagonal boron nitride being 0.2432kg/m 3 ~0.3648 kg/m 3 In this embodiment, the doping amount of hexagonal boron nitride is 0.304kg/m 3 Hexagonal boron nitride ， Adding hexagonal boron nitride while adding water reducing agent and stirring. Example 4 high strength pervious concrete was obtained.
Example 5
The difference from the example 2 is that the doping amount of the hexagonal boron nitride is 0.304kg/m 3 . Example 5 high strength pervious concrete was obtained.
Example 6
The difference from the embodiment 3 is that the doping amount of the hexagonal boron nitride is 0.3648kg/m 3 . Example 6 high strength pervious concrete was obtained.
Example 7
The difference from the example 4 is that the doping amount of the hexagonal boron nitride is 0.2432kg/m 3 . Example 7 high strength pervious concrete was obtained.
Example 8
The difference from the embodiment 4 is that the doping amount of the hexagonal boron nitride is 0.3648kg/m 3 . Example 8 high strength pervious concrete was obtained.
Example 9
The difference from example 1 is that in the cement 90.69% by mass of the cement, the fly ash 4.53% by mass of the cement, the silica fume 4.78% by mass of the cement and the cement 335.2kg/m 3 Adding hexagonal boron nitride and basalt fiber, wherein the doping amount of the hexagonal boron nitride is 0.08%, and the doping amount of the basalt fiber is 0.10%, namely the doping amount of the hexagonal boron nitride is 0.2432kg/m 3 Basalt fiber of 0.304kg/m 3 The water consumption is 95.76kg/m 3， Adding the brown during the stirring process of adding the cementing materialAdding the hexagonal boron nitride into the wu-shi fibers while adding the water reducing agent and stirring. Example 9 high strength pervious concrete was obtained.
Example 10
The difference from example 9 is that the amount of hexagonal boron nitride added is 0.10%, the amount of basalt fiber added is 0.20%, and the amount of hexagonal boron nitride added is 0.2432kg/m 3 Basalt fiber of 0.304kg/m 3 . Example 10 high strength pervious concrete was obtained.
Example 11
The difference from the example 9 is that the doping amount of the hexagonal boron nitride is 0.12%, the doping amount of the basalt fiber is 0.30%, and the doping amount of the hexagonal boron nitride is 0.3648kg/m 3 Basalt fiber of 0.912kg/m 3 . Example 11 high strength pervious concrete was obtained.
Example 12
The difference from the example 9 is that in the cementing material, the cement accounts for 86.76 percent of the mass of the cementing material, the fly ash accounts for 8.68 percent of the mass of the cementing material, the silica fume accounts for 3.04 percent of the mass of the cementing material, the content of basalt fiber is 0.20 percent, and the mass of the cementing material is 350.4kg/m 3 The basalt fiber is 0.608kg/m 3 The water consumption is 100.32kg/m 3 . Example 12 high strength pervious concrete was obtained.
Example 13
The difference from example 12 is that the amount of doped hexagonal boron nitride is 0.10%, and the amount of doped basalt fiber is 0.30%, that is, the amount of doped hexagonal boron nitride is 0.304kg/m 3 Basalt fiber of 0.912kg/m 3 . Example 13 high strength pervious concrete was obtained.
Example 14
The difference from example 12 is that the doping amount of hexagonal boron nitride is 0.12%, and the doping amount of basalt fiber is 0.10%, that is, the doping amount of hexagonal boron nitride is 0.3648kg/m 3 Basalt fiber of 0.304kg/m 3 . Example 14 yielded a high strength pervious concrete.
Example 15
The difference from example 9 is that in the cement, the fly ash and the silicon ash are 83.15%, 8.32%, 8.53% and hexagonal nitrogen respectively based on the mass of the cement and 8.53%, respectivelyThe doping amount of boron is 0.08 percent, the doping amount of basalt fiber is 0.30 percent, and the cementing material is 365.6kg/m 3 Hexagonal boron nitride of 0.2432kg/m 3 Basalt fiber of 0.912kg/m 3 The water consumption is 104.88kg/m 3 . Example 15 high strength pervious concrete was obtained.
Example 16
The difference from example 15 is that the amount of hexagonal boron nitride incorporated is 0.10%, and the amount of basalt fiber incorporated is 0.10%, that is, the amount of hexagonal boron nitride is 0.304kg/m 3 Basalt fiber of 0.304kg/m 3 . Example 12 high strength pervious concrete was obtained.
Example 17
The difference from the example 15 is that the doping amount of the hexagonal boron nitride is 0.12%, and the doping amount of the basalt fiber is 0.20%, that is, the doping amount of the hexagonal boron nitride is 0.3648kg/m 3 The basalt fiber is 0.608kg/m 3 . Example 13 high strength pervious concrete was obtained.
Aiming at the specific embodiment, the basic performance of the pervious concrete obtained in the embodiment 1-17 is tested, wherein the compression strength and the bending tensile strength are tested according to the method of the national standard GB/T50081-2002 Standard for testing the mechanical properties of ordinary concrete; the water permeability test is determined according to the method of standard CJJ/T135-2009 permeable cement concrete pavement technical Specification, and the specific implementation effect is shown in Table 5:
TABLE 5 pervious concrete mix proportions basic Properties of the examples
As can be seen from table 5, the optimal mixture ratio of the pervious concrete without the addition of the hexagonal boron nitride and the basalt fiber is 1528.8kg/m3 for the coarse aggregate, 80.5kg/m3 for the fine aggregate, 3.04kg/m3 for the water reducing agent, 18.7MPa for the compressive strength in 28 days, 4.32MPa for the flexural strength in 28 days, and 3.58mm/s for the water permeability coefficient, which cannot meet the requirements of CJJ/T135-2009 technical specification of pervious cement concrete pavement on the pervious concrete of the pavement layer (the lowest strength grade is C20, and the flexural strength is >2.5 MPa), meaning that the ordinary pervious concrete under the formula cannot be used in the road paving engineering; after the hexagonal boron nitride is doped into the pervious concrete, the compressive strength of the pervious concrete is obviously improved, the increase range of the compressive strength is 8.57-13.90%, and the 28-day flexural tensile strength is also improved by a small range; after the hexagonal boron nitride and the basalt fibers are doped into the pervious concrete, the mechanical property of the compound pervious concrete is obviously improved, the water permeability of the pervious concrete is also improved, the 28-day compressive strength expansion amplitude is 7.49-28.88%, the 28-day flexural tensile strength expansion amplitude is 1.39-19.68%, and the 28-day water permeability coefficient expansion amplitude is 19.0-42.18%, so that the requirements of CJJ/T135-2009 technical Specification for pervious cement concrete pavements on road surface pervious concrete are met, the manufacturing cost is low, and the industrial application is easy.
By adding the hexagonal boron nitride into the high-strength pervious concrete raw material, the hexagonal boron nitride has good lubricating property, so that the viscosity of the cementing material can be obviously increased, and the aggregate is tightly combined with the cementing material, thereby improving the compressive strength of the pervious concrete; the basalt fiber is a novel high-performance fiber, has the advantages of low cost, greenness, harmlessness and the like, can be bridged in the pervious concrete, solves the problem of cracks caused by brittleness, and further enhances the compressive strength of the pervious concrete.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.
Claims (10)
1. The utility model provides a high strength pervious concrete which characterized in that: the material comprises, by weight, 1375.9-1681.7 parts of coarse aggregate, 74.3-88.6 parts of fine aggregate, 2.76-3.34 parts of a water reducing agent, 335.2-365.6 parts of a cementing material, 0.2432-0.3648 part of hexagonal boron nitride and 95.76-104.88 parts of water.
2. The high-strength pervious concrete according to claim 1, wherein: the grain diameter of the hexagonal boron nitride is 6.5-7.5 mu m, the carbon content is 0.0185-0.0285%, and the purity of the hexagonal boron nitride is more than or equal to 99%.
3. The high-strength pervious concrete according to claim 1, wherein: 1528.8 parts of coarse aggregate, 80.5 parts of fine aggregate, 3.04 parts of water reducing agent, 350.4 parts of cementing material, 0.304 part of hexagonal boron nitride and 100.32 parts of water, wherein the grain diameter of the hexagonal boron nitride is 7.04 mu m, the carbon content is 0.0235 percent and the purity is 99 percent.
4. The high-strength pervious concrete according to claim 1, characterized in that: the particle size of the coarse aggregate is 5-10mm, and the fineness modulus of the fine aggregate is 2.5.
5. The high-strength pervious concrete according to claim 1, wherein: the cementing material comprises cement, fly ash and silica fume.
6. The high-strength pervious concrete according to claim 5, wherein: the cement is P.042.5 ordinary portland cement, the cement accounts for 83.15-90.69% by mass of the cementing material, the fly ash accounts for 4.53-12.47% by mass of the cementing material, and the silica fume accounts for 4.38-4.78% by mass of the cementing material.
7. The high-strength pervious concrete according to claim 1, characterized in that: also comprises 0.304 to 0.912 portion of basalt fiber.
8. The high-strength pervious concrete according to claim 7, wherein: the basalt fiber has the diameter of 16-22 microns, the density of 2.7 g/cm for carrying out heavy planting, the tensile strength is 4300MPa, the breaking strength is 3200MPa, the elastic modulus is 89 Gpa, and the elongation at break is 3.2%.
9. A preparation method of the high-strength permeable concrete as claimed in any one of claims 1 to 6, characterized by comprising the following steps: the method comprises the following steps:
(1) Preparing materials: preparing coarse aggregate, fine aggregate, a water reducing agent, a cementing material, hexagonal boron nitride and water according to parts by weight;
(2) Stirring: firstly, adding coarse aggregate, fine aggregate and 10% of water into a stirrer for premixing; after the pre-mixing is finished, adding the cementing material into the pre-mixed material, so that the cementing material is uniformly wrapped on the shell of the aggregate; then, adding the remaining 90% of water, the water reducing agent and the hexagonal boron nitride into a stirrer for stirring to obtain a pervious concrete mixture;
(3) Molding: filling the pervious concrete mixture obtained in the step (2) into a mould twice, wherein the quantity of the pervious concrete mixture filled into the mould for the first time is more than or equal to 2/3 of the volume quantity of the mould, compacting the pervious concrete mixture in the mould after the pervious concrete mixture is filled into the mould for the first time, then continuously compacting the rest pervious concrete mixture, and standing still for 48 hours in the mould after the compaction is finished to obtain a pervious concrete formed part, wherein the surface of the pervious concrete formed part needs to be covered by a preservative film, so that the water loss is reduced;
(4) And (5) maintenance: and (4) removing the mold of the pervious concrete formed part obtained in the step (3), and curing for 7 days or 28 days to obtain the pervious concrete.
10. A method for preparing the high-strength pervious concrete according to claim 7 or 8, characterized in that: the method comprises the following steps:
(1) Preparing materials: preparing coarse aggregate, fine aggregate, a water reducing agent, a cementing material, hexagonal boron nitride and water according to parts by weight;
(2) Stirring: firstly, adding coarse aggregate, fine aggregate and 10% of water into a stirrer for premixing; after the pre-mixing is finished, adding a cementing material into the pre-mixed material, so that the cementing material is uniformly wrapped on a shell of the aggregate, and adding basalt fibers in the stirring process; then, adding the remaining 90% of water, the water reducing agent and the hexagonal boron nitride into a stirrer for stirring to obtain a pervious concrete mixture;
(3) Molding: filling the pervious concrete mixture obtained in the step (2) into a mould twice, wherein the quantity of the pervious concrete mixture filled into the mould for the first time is more than or equal to 2/3 of the volume quantity of the mould, compacting the pervious concrete mixture in the mould after the pervious concrete mixture is filled into the mould for the first time, then continuously compacting the rest pervious concrete mixture, and standing still for 48 hours in the mould after the compaction is finished to obtain a pervious concrete formed part, wherein the surface of the pervious concrete formed part needs to be covered by a preservative film, so that the water loss is reduced;
(4) And (5) maintenance: and (4) removing the mold of the pervious concrete forming part obtained in the step (3), and curing for 7 days or 28 days to obtain the pervious concrete.
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| CN116003034A (en) * | 2023-01-16 | 2023-04-25 | 长春工程学院 | Basalt fiber pervious concrete material for quaternary frozen area and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4933013A (en) * | 1985-08-06 | 1990-06-12 | Denki Kagaku Kogyo Kabushiki Kaisha | Hydraulic material composition having high strength |
| CN109534744A (en) * | 2018-10-23 | 2019-03-29 | 华北水利水电大学 | The preparation method of regeneration aggregate pervious concrete |
| CN112408880A (en) * | 2020-11-18 | 2021-02-26 | 西京学院 | Basalt fiber water-permeable concrete and preparation method thereof |
| CN113698149A (en) * | 2021-08-16 | 2021-11-26 | 广西新发展交通集团有限公司 | Environment-friendly pervious concrete and preparation method thereof |
-
2022
- 2022-09-21 CN CN202211148827.8A patent/CN115466089A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4933013A (en) * | 1985-08-06 | 1990-06-12 | Denki Kagaku Kogyo Kabushiki Kaisha | Hydraulic material composition having high strength |
| CN109534744A (en) * | 2018-10-23 | 2019-03-29 | 华北水利水电大学 | The preparation method of regeneration aggregate pervious concrete |
| CN112408880A (en) * | 2020-11-18 | 2021-02-26 | 西京学院 | Basalt fiber water-permeable concrete and preparation method thereof |
| CN113698149A (en) * | 2021-08-16 | 2021-11-26 | 广西新发展交通集团有限公司 | Environment-friendly pervious concrete and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| YOMIN CHOI等: "Experimental Study on Improving Compressive Strength of Hexagonal Boron Nitride Reinforced Cement Composite" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116003034A (en) * | 2023-01-16 | 2023-04-25 | 长春工程学院 | Basalt fiber pervious concrete material for quaternary frozen area and preparation method thereof |
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