CN106747096A - A kind of basalt fibre compounding polyvinyl chloride improves the resistance to compression water-permeable brick of sound-absorbing effect - Google Patents
A kind of basalt fibre compounding polyvinyl chloride improves the resistance to compression water-permeable brick of sound-absorbing effect Download PDFInfo
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- CN106747096A CN106747096A CN201611175333.3A CN201611175333A CN106747096A CN 106747096 A CN106747096 A CN 106747096A CN 201611175333 A CN201611175333 A CN 201611175333A CN 106747096 A CN106747096 A CN 106747096A
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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
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses the resistance to compression water-permeable brick that a kind of basalt fibre compounding polyvinyl chloride improves sound-absorbing effect, it is made from the following raw materials in parts by weight：Granite leftover bits 40 43, discarded concrete 30 32, 42.5 grades of Portland cements 20 22, polyester-cotton fabric leftover pieces 2 2.5, poly-epoxychloropropane dimethylamine 0.1 0.12, Early-strength polycarboxylate superplasticizer 0.3 0.4, appropriate amount of water, PVC paste resin 45, basalt fibre 7.5 9, concentration is appropriate for the sodium hydroxide solution of 5wt%, concentration is appropriate for the acetum of 10wt%, appropriate deionized water, Silane coupling agent KH550 1 1.2, tributylcitrate 23, calcium stearate 0.5 0.6.The adobe that the present invention is made has good plasticity, toughness, compression strength, wearability, is provided simultaneously with the through hole of prosperity, and coefficient of permeability is high, possesses the function of absorbing noise.
Description
Technical field
Sound-absorbing is improve the present invention relates to water-permeable brick technical field, more particularly to a kind of basalt fibre compounding polyvinyl chloride
The resistance to compression water-permeable brick of effect.
Background technology
In recent years, whenever rainy season, each big city " seeing sea " phenomenon takes place frequently.Water penetration ground is due to alleviation municipal drainage
System flood discharge pressure, recharge of groundwater resource, improve urban surface plant and edaphon life condition, make underground moisture
It is easy to the advantages of evaporating and eliminate urban heat land effect and is paid close attention to by more and more researchers.Water-permeable pavement is helped
In air and moisture circulation, eliminate tropical island effect, sqouynd absorption lowering noise.Water-permeable pavement brick is the main composition on urban water-through road surface
Composition, mainly there is 3 kinds of cement base pervious concrete brick, macromolecule pervious concrete brick and sintering brick permeable to water.Wherein, cement base
Pervious concrete brick manufacture craft is simple, and with low cost and stable performance is suitable for large-scale promotion application, general to have well
Water penetration, water-retaining property, it is while intensity requirement is met, in addition it is also necessary to keep certain insertion hole meet water penetration will
The brick asked.Therefore when preparing in addition to selecting suitable raw material, will also be by mix-design, preparation technology, additive
To meet the requirement of intensity and porosity.
《The research of water-permeable brick is made using discarded concrete optimization》Natural aggregate is substituted using discarded concrete in one text,
Using positive quadraturing design test method, analysis aggregate size, gelatine are than, the ratio of mud and water reducer, silica flour and discarded concrete
Influence of the different addition quantity to water-permeable brick intensity and coefficient of permeability, obtains optimum mix proportion, in the reinforcing and maintenance of regeneration aggregate
The water-permeable brick being made under the improvement of mode, intensity increases, and meets laying and requires, realizes twice laid, energy-saving and emission-reduction, but
Be because intensity improves limited, due also to the mobility feature of concrete, easily occur when brick body be molded it is heavy starch phenomenon, oozing
Aquaporin blocks influence water penetration, and cement layer because of stream slurry, and the cement layer at node will be thinning, is unfavorable for the hair of brick strength
Exhibition.To reach more surcharges while must being thus modified to it, then meet strength demand, can be to water
Mud water-permeable brick carries out more preferable popularization and application.
The content of the invention
The object of the invention is exactly to make up the defect of prior art, there is provided a kind of basalt fibre compounding polyvinyl chloride is carried
The resistance to compression water-permeable brick of sound-absorbing effect high.
The present invention is achieved by the following technical solutions：
A kind of basalt fibre compounding polyvinyl chloride improves the resistance to compression water-permeable brick of sound-absorbing effect, by the raw material system of following weight portion
Into：Granite leftover bits 40-43, discarded concrete 30-32,42.5 grades of Portland cement 20-22, polyester-cotton fabric corners
Material 2-2.5, poly-epoxychloropropane dimethylamine 0.1-0.12, Early-strength polycarboxylate superplasticizer 0.3-0.4, appropriate amount of water, polyvinyl chloride
Paste resin 4-5, basalt fibre 7.5-9, concentration are for the sodium hydroxide solution of 5wt% is appropriate, concentration is the acetum of 10wt%
In right amount, appropriate deionized water, Silane coupling agent KH550 1-1.2, tributylcitrate 2-3, calcium stearate 0.5-0.6.
A kind of basalt fibre compounding polyvinyl chloride improves the resistance to compression water-permeable brick of sound-absorbing effect, by walking in detail below
Suddenly it is made：
（1）Granite leftover bits are put into crusher in crushing into the little particle of 7-10mm, discarded concrete is put into disintegrating machine
In be broken into the particle of 5-10mm, then two kinds of particles is mixed, obtain mixing coarse aggregate；
（2）Polyester-cotton fabric leftover pieces are sheared and pine is torn, the fabric pieces for forming 3mm × 3mm are stand-by；By Hydrin two
Methylamine is dissolved in 100 times of water of amount, and stirring adds above-mentioned fabrics fragment to after being completely dissolved, and is stirred with 400-500 revs/min of speed
30-40 minutes is stood after mixing 4-5 minutes, the fabric pieces after impregnation process are put in an oven with 100-110 DEG C of drying in filtering
100-120 minutes, taken out after cooling；
（3）Basalt fibre is crushed, 50 mesh sieves are crossed, is then placed in the sodium hydroxide solution that the 2-3 times of concentration measured is 5wt%
Immersion is taken out after 60-80 minutes, and the acetum immersion 90- for being put into that 2-3 concentration is 10wt% afterwards for several times is cleaned with deionized water
Taken out after 120 minutes, be put into baking oven dry it is stand-by；Silane coupling agent KH550 is dissolved in the 20-25 times of deionized water measured,
The basalt fibre after above-mentioned treatment is added after stirring to complete hydrolysis, immersion is taken out after 30-50 minutes, puts drying box into,
Drying obtains treated basalt fiber at 80-100 DEG C；
（4）Step is added after tributylcitrate, calcium stearate are mixed（3）The treated basalt fiber for obtaining, is put into mixed at a high speed
In material machine, mixing adds PVC paste resin after 3-5 minutes, in continuing to mix 10-15 minutes in feeding double screw extruder,
With 160-170 DEG C of extruding pelletization, then the particle that will be obtained is crushed in 80-90 DEG C of drying, crosses 100 mesh sieves stand-by；
（5）By step（1）, step（2）The product for obtaining stirs under anhydrous conditions, adds appropriate water so that mixing
Thing surface is no longer entirely wetted, and is subsequently adding step（4）Product, 42.5 grades of Portland cements and remaining residue for obtaining into
Point, suitable quantity of water is continuously added after stirring, it is 0.3 to control the ratio of mud, continues stirring and enables within 10-15 minutes cement mortar fully
Every aggregate of parcel, finally pours into mould mixture, is gently plugged and pounded with the smooth wooden stick in one end, in 4MPa after flattened faces
Pressure under compressing, static pressure 90 seconds, brick body is put into concrete standard and supported by freeze-day with constant temperature 48 hours at 25 DEG C after the demoulding
Conserved on request in protecting box 28 days.
It is an advantage of the invention that：After the present invention is broken into certain particle diameter using granite leftover bits and discarded concrete
Mixed and disorderly is distributed in concrete, the skeleton structure of water-permeable brick is constituted due to its random distribution of orientations, by suitably matching somebody with somebody
Than so that the brick body being made has good intensity and rational porosity, and uses discarded object, both reduces raw material
Cost, it is also environmentally friendly；Coordinate the addition of the modified fabric pieces of poly-epoxychloropropane dimethylamine, good hydrophilic property, with cement
Cohesive enhancing, improve the compression strength of brick body, and uniformly can be filled in the gap of aggregate, water-permeable brick into
During type, modified fabric pieces reduce the mobility of concrete, it is to avoid the company between its obstruction aggregate that flows downward
Through hole gap, prevents aggregate sedimentation, it is ensured that the water permeability of water-permeable brick；Appropriate fabric pieces adjustable concrete is secreted simultaneously
It is aqueous, can reduce because concrete water bleeding can stop that crack end moves forward in particles of aggregates microcrack formed below, during compression, from
And improve the intensity of water-permeable brick；When water-permeable brick is pressurized and shrinks, it shrinks energy and is absorbed by fabric pieces, effectively increases
The toughness of water brick, it is suppressed that the generation and development of crackle；The addition of fabric pieces, part concrete is adsorbed by fabric, aggregate it
Between cementing layer it is thinning, hole increase, increase coefficient of permeability, and due to the hydrophilicity of fabric pieces, enhance
The water retention coefficient of brick body.
The present invention is compounded basalt fibre and polyvinyl chloride by a series of PROCESS FOR TREATMENT, and basalt chopped fiber exists
Dispersiveness is relatively good in polyvinyl chloride, is distributed in inside concrete, expands the internal interface of brick body so that brick body has multilayer
The effect of sound insulation, and improve the rigidity of brick body, toughness；The adobe that the present invention is made has good plasticity, toughness, resistance to compression
Intensity, wearability, are provided simultaneously with the through hole of prosperity, and coefficient of permeability is high, possess the function of absorbing noise, and raw material proportioning science is closed
Reason, is well suited for large-scale industrial production urban pavement water-permeable brick.
Specific embodiment
A kind of basalt fibre compounding polyvinyl chloride improves the resistance to compression water-permeable brick of sound-absorbing effect, by following weight portion（It is public
Jin）Raw material be made：Granite leftover bits 40, discarded concrete 30,42.5 grades of Portland cements 20, polyester-cotton fabric sides
Corner material 2, poly-epoxychloropropane dimethylamine 0.1, Early-strength polycarboxylate superplasticizer 0.3, appropriate amount of water, the PVC paste resin 4, Black Warrior
Rock fiber 7.5, concentration is for the sodium hydroxide solution of 5wt% is appropriate, concentration is for the acetum of 10wt% is appropriate, deionized water is fitted
Amount, Silane coupling agent KH550 1, tributylcitrate 2, calcium stearate 0.5.
A kind of basalt fibre compounding polyvinyl chloride improves the resistance to compression water-permeable brick of sound-absorbing effect, by walking in detail below
Suddenly it is made：
（1）Granite leftover bits are put into crusher in crushing into the little particle of 7mm, discarded concrete are put into disintegrating machine and are broken
The particle of 5mm is broken into, then mixes two kinds of particles, obtain mixing coarse aggregate；
（2）Polyester-cotton fabric leftover pieces are sheared and pine is torn, the fabric pieces for forming 3mm × 3mm are stand-by；By Hydrin two
Methylamine is dissolved in 100 times of water of amount, and stirring adds above-mentioned fabrics fragment to after being completely dissolved, and 4 are stirred with 400 revs/min of speed
30 minutes are stood after minute, the fabric pieces after impregnation process are put in an oven with 100 DEG C of dryings 100 minutes, cooling in filtering
After take out；
（3）Basalt fibre is crushed, 50 mesh sieves are crossed, 2 times of concentration of amount is then placed in be soaked in the sodium hydroxide solution of 5wt%
Bubble takes out after 60 minutes, clean with deionized water and is taken after being put into the immersion of acetum that 2 concentration are 10wt% afterwards for several times 90 minutes
Go out, be put into baking oven dry it is stand-by；Silane coupling agent KH550 is dissolved in 20 times of deionized waters of amount, stirring to complete hydrolysis
The basalt fibre after above-mentioned treatment is added afterwards, and immersion is taken out after 30 minutes, puts drying box into, is dried at 80 DEG C and is modified
Basalt fibre；
（4）Step is added after tributylcitrate, calcium stearate are mixed（3）The treated basalt fiber for obtaining, is put into mixed at a high speed
In material machine, mixing adds PVC paste resin after 3 minutes, in continuing to mix 10 minutes in feeding double screw extruder, with 160
Then DEG C extruding pelletization, the particle that will be obtained is crushed in 80 DEG C of drying, crosses 100 mesh sieves stand-by；
（5）By step（1）, step（2）The product for obtaining stirs under anhydrous conditions, adds appropriate water so that mixing
Thing surface is no longer entirely wetted, and is subsequently adding step（4）Product, 42.5 grades of Portland cements and remaining residue for obtaining into
Point, suitable quantity of water is continuously added after stirring, it is 0.3 to control the ratio of mud, continues stirring and enables that cement mortar is fully wrapped in 10 minutes
Every aggregate is wrapped up in, finally mixture is poured into mould, is gently plugged and pounded with the smooth wooden stick in one end, 4MPa's after flattened faces
It is compressing under pressure, static pressure 90 seconds, brick body is put into concrete standard maintenance by freeze-day with constant temperature 48 hours at 25 DEG C after the demoulding
Conserved on request in case 28 days.
The pervious floor tile being made to the embodiment of the present invention carries out properties test, and coefficient of permeability is 0.259mm/s, resistance to compression
Intensity is 32.98MPa, and 25 times Frozen-thawed cycled compression strength loss are less than 20%, meet professional standard.
Claims (2)
1. a kind of basalt fibre compounding polyvinyl chloride improves the resistance to compression water-permeable brick of sound-absorbing effect, it is characterised in that by following
The raw material of weight portion is made：Granite leftover bits 40-43, discarded concrete 30-32,42.5 grades of Portland cement 20-
22nd, polyester-cotton fabric leftover pieces 2-2.5, poly-epoxychloropropane dimethylamine 0.1-0.12, Early-strength polycarboxylate superplasticizer 0.3-0.4,
Appropriate amount of water, PVC paste resin 4-5, basalt fibre 7.5-9, concentration are for the sodium hydroxide solution of 5wt% is appropriate, concentration is
The acetum of 10wt% is appropriate, appropriate deionized water, Silane coupling agent KH550 1-1.2, tributylcitrate 2-3, calcium stearate
0.5-0.6。
2. a kind of basalt fibre compounding polyvinyl chloride improves the resistance to compression water-permeable brick of sound-absorbing effect according to claim 1,
Characterized in that, being made up of step in detail below：
（1）Granite leftover bits are put into crusher in crushing into the little particle of 7-10mm, discarded concrete is put into disintegrating machine
In be broken into the particle of 5-10mm, then two kinds of particles is mixed, obtain mixing coarse aggregate；
（2）Polyester-cotton fabric leftover pieces are sheared and pine is torn, the fabric pieces for forming 3mm × 3mm are stand-by；By Hydrin two
Methylamine is dissolved in 100 times of water of amount, and stirring adds above-mentioned fabrics fragment to after being completely dissolved, and is stirred with 400-500 revs/min of speed
30-40 minutes is stood after mixing 4-5 minutes, the fabric pieces after impregnation process are put in an oven with 100-110 DEG C of drying in filtering
100-120 minutes, taken out after cooling；
（3）Basalt fibre is crushed, 50 mesh sieves are crossed, is then placed in the sodium hydroxide solution that the 2-3 times of concentration measured is 5wt%
Immersion is taken out after 60-80 minutes, and the acetum immersion 90- for being put into that 2-3 concentration is 10wt% afterwards for several times is cleaned with deionized water
Taken out after 120 minutes, be put into baking oven dry it is stand-by；Silane coupling agent KH550 is dissolved in the 20-25 times of deionized water measured,
The basalt fibre after above-mentioned treatment is added after stirring to complete hydrolysis, immersion is taken out after 30-50 minutes, puts drying box into,
Drying obtains treated basalt fiber at 80-100 DEG C；
（4）Step is added after tributylcitrate, calcium stearate are mixed（3）The treated basalt fiber for obtaining, is put into mixed at a high speed
In material machine, mixing adds PVC paste resin after 3-5 minutes, in continuing to mix 10-15 minutes in feeding double screw extruder,
With 160-170 DEG C of extruding pelletization, then the particle that will be obtained is crushed in 80-90 DEG C of drying, crosses 100 mesh sieves stand-by；
（5）By step（1）, step（2）The product for obtaining stirs under anhydrous conditions, adds appropriate water so that mixing
Thing surface is no longer entirely wetted, and is subsequently adding step（4）Product, 42.5 grades of Portland cements and remaining residue for obtaining into
Point, suitable quantity of water is continuously added after stirring, it is 0.3 to control the ratio of mud, continues stirring and enables within 10-15 minutes cement mortar fully
Every aggregate of parcel, finally pours into mould mixture, is gently plugged and pounded with the smooth wooden stick in one end, in 4MPa after flattened faces
Pressure under compressing, static pressure 90 seconds, brick body is put into concrete standard and supported by freeze-day with constant temperature 48 hours at 25 DEG C after the demoulding
Conserved on request in protecting box 28 days.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611175333.3A CN106747096A (en) | 2016-12-19 | 2016-12-19 | A kind of basalt fibre compounding polyvinyl chloride improves the resistance to compression water-permeable brick of sound-absorbing effect |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611175333.3A CN106747096A (en) | 2016-12-19 | 2016-12-19 | A kind of basalt fibre compounding polyvinyl chloride improves the resistance to compression water-permeable brick of sound-absorbing effect |
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| CN106747096A true CN106747096A (en) | 2017-05-31 |
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| CN201611175333.3A Withdrawn CN106747096A (en) | 2016-12-19 | 2016-12-19 | A kind of basalt fibre compounding polyvinyl chloride improves the resistance to compression water-permeable brick of sound-absorbing effect |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109467363A (en) * | 2018-12-11 | 2019-03-15 | 青岛鑫岩建材有限公司 | A kind of high-strength water-permeable concrete |
| CN111944305A (en) * | 2020-08-03 | 2020-11-17 | 马鞍山市金韩防水保温工程有限责任公司 | Sound insulation material for indoor decoration and preparation method thereof |
| CN115677286A (en) * | 2022-11-03 | 2023-02-03 | 柳晶（溧阳）环保科技有限公司 | High-strength water permeable brick prepared from waste sand and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102604200A (en) * | 2012-04-01 | 2012-07-25 | 成都新柯力化工科技有限公司 | Composite masterbatch of mineral fiber with high length-diameter ratio and preparation method |
| CN103058613A (en) * | 2013-01-23 | 2013-04-24 | 清远绿由环保科技有限公司 | Curb produced by using waste ceramic slag and waste road concrete and manufacturing method |
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2016
- 2016-12-19 CN CN201611175333.3A patent/CN106747096A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102604200A (en) * | 2012-04-01 | 2012-07-25 | 成都新柯力化工科技有限公司 | Composite masterbatch of mineral fiber with high length-diameter ratio and preparation method |
| CN103058613A (en) * | 2013-01-23 | 2013-04-24 | 清远绿由环保科技有限公司 | Curb produced by using waste ceramic slag and waste road concrete and manufacturing method |
Non-Patent Citations (1)
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109467363A (en) * | 2018-12-11 | 2019-03-15 | 青岛鑫岩建材有限公司 | A kind of high-strength water-permeable concrete |
| CN111944305A (en) * | 2020-08-03 | 2020-11-17 | 马鞍山市金韩防水保温工程有限责任公司 | Sound insulation material for indoor decoration and preparation method thereof |
| CN115677286A (en) * | 2022-11-03 | 2023-02-03 | 柳晶（溧阳）环保科技有限公司 | High-strength water permeable brick prepared from waste sand and preparation method thereof |
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Application publication date: 20170531 |