CN109336441A - A kind of permeable aggregate and preparation method thereof for concrete - Google Patents
A kind of permeable aggregate and preparation method thereof for concrete Download PDFInfo
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- CN109336441A CN109336441A CN201811299861.9A CN201811299861A CN109336441A CN 109336441 A CN109336441 A CN 109336441A CN 201811299861 A CN201811299861 A CN 201811299861A CN 109336441 A CN109336441 A CN 109336441A
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- aggregate
- starch
- cementitious material
- permeable
- concrete
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/12—Multiple coating or impregnating
Abstract
The present invention relates to building material technical fields, more particularly to a kind of permeable aggregate and preparation method thereof for concrete, the permeable aggregate includes cementitious material and aggregate, and the aggregate outer surface is uniformly enclosed with cementitious material, and the cementitious material outer surface is enclosed with starch film.Permeable aggregate processing method includes: to stir evenly cementitious material；Aggregate surface dehydrated alcohol is sprayed complete wetting；Cementitious material is mixed with the aggregate of wetting；Modified starch is dissolved in the starch coating solution for obtaining that mass fraction is 1%-5% in solvent；It by starch film spray solution to the cementitious material surface for being enclosed with aggregate, is dried, forms starch film, permeable aggregate is made.The concrete prepared by the permeable aggregate can effectively solve the problems such as concrete quality fluctuation is big, transportation cost is high, remaining slurry waste, pollution, the engineering less for dosage, maintenance engineering or especially convenient in the engineering of the inconvenient place construction of communications and transportation.
Description
Technical field
The present invention relates to building material technical fields, more particularly to a kind of for the permeable aggregate of concrete and its preparation
Method.
Background technique
Pervious concrete is using simple grain grade coarse aggregate as skeleton, and cement paste is wrapped in the surface of coarse aggregate particle,
The concrete with honeycombed spots material of formation.As a kind of environmental protection, ecotypic pavement material, there is water penetration, can comparatively fast eliminate
Road, square ponding mitigate municipal drainage burden；Rainwater can be made to rapidly permeate into underground, recharge of groundwater keeps soil moisture, dimension
Protect the ecological balance of underground water and soil；The ground covered in terms of absorbing heat with heat storage function close to natural vegetation is adjusted
The temperature and humidity of city space alleviates urban heat land effect；Pervious concrete pavement is that a kind of conservation of nature, maintenance ecology are flat
Weighing apparatus, the excellent new technology for alleviating urban heat land effect, are conducive to the benign development of living environment.
Pervious concrete should have enough intensity, there is good water penetration again, and pervious concrete mostly uses existing at present
Field stirring form of construction work, water penetration and intensity all cannot be controlled effectively, using mixing building production and the production of tank car transport
Mode technical difficulty is larger, and concrete quality fluctuation is big after construction, and quality accident rate is high.
In the prior art, Publication No. CN107365114A is proposed, publication date is the middle promulgated by the State Council on December 12nd, 2017
Bright patent document, to solve above-mentioned technical problem, technical solution disclosed in the patent document is as follows: one kind is suitble to stir
Mix the pervious concrete of transport, the pervious concrete of the suitable stirring transport includes coarse aggregate and equal on the coarse aggregate surface
The cement base cementitious matter of even package, the dosage of each component of the cement base cementitious matter is by weight are as follows: 425 or label be greater than 425
Cement: 1 part, water-reducing agent: 0.003-0.01 parts, silicon powder: 0.04-0.05 parts, starch ether: 0-0.0003 parts, redispersible cream
Rubber powder: 0.0002-0.005 parts, cellulose ether: 0.0002-0.001, retarder: 0.005-0.02 part, water: 0.25-0.35 parts
And flyash: 0-0.1 parts.
Above-mentioned technical proposal can have the following problems in implementation process:
(1) water conservation of cellulose ether is relied primarily in the technical solution and increases silk fabric effect, the extension pervious concrete of retarder
Setting time, the increasing silk fabric effect of starch ether, makes cement slurry when transport not sink.By the component, extend the saturating of stirring transport
The setting time of water coagulation soil, makes convenient transportation.The technical solution compared with prior art, although permeable coagulation has been appropriately extended
The setting time of soil, but the effect actually can achieve using tank car transport in the prior art, the transport for long range,
If the phenomenon that not using tank car during concrete transportation, can still deposit concrete setting during transportation.
(2) it is transported according to tank car, can generate certain remaining slurry, it is at high cost and will cause waste and pollution.
(3) setting time can be extended, but the quality fluctuation of pervious concrete is also big.
Summary of the invention
In order to solve the above technical problems, the permeable aggregate and preparation method thereof that the invention proposes a kind of for concrete,
By the concrete of permeable aggregate preparation, big concrete quality fluctuation, transportation cost height, remaining slurry waste, dirt can effectively solve
The problems such as dye, the engineering less for dosage, maintenance engineering or the inconvenient place construction of communications and transportation engineering especially just
It is prompt.
The present invention is realized by using following technical proposals:
A kind of permeable aggregate for concrete includes cementitious material and aggregate, it is characterised in that: the aggregate outer surface is uniform
It is enclosed with cementitious material, the cementitious material outer surface is enclosed with starch film, and the starch film is the shallow lake that mass fraction is 1%-5%
Powder coating solution is sprayed at dry formation behind cementitious material outer surface, and the starch coating solution is dissolved in solvent for modified starch to be obtained
It arrives.
The solvent is 1,4- dioxane, methylene chloride, chloroform or acetone.
The modified starch is obtained through cornstarch, potato starch, tapioca or rice starch esterification modification.
The starch film with a thickness of 10 μm -20 μm.
The cementitious material include 88~94 parts of cement, 5~10 parts of reinforcing material, 0.1~0.5 part of water-reducing agent,
0.9~1.7 part of latex powder.
The reinforcing material is one or both of silicon powder, nano silica.
The latex powder is redispersable latex powder.
The cement is ordinary portland cement, and grade is 42.5 or 52.5.
The aggregate is the rubble of partial size 5-10mm.
A kind of permeable aggregate processing method for concrete, it is characterised in that: the following steps are included:
A. cementitious material is stirred evenly；
B. aggregate surface dehydrated alcohol is sprayed complete wetting；
C. cementitious material is mixed with the aggregate of wetting, aggregate surface is made uniformly to wrap up cementitious material；
D., modified starch is dissolved in the starch coating solution for obtaining that mass fraction is 1%-5% in solvent；
E. it by starch film spray solution to the cementitious material surface for being enclosed with aggregate, is dried, forms starch film, be made
Water aggregate.
Compared with prior art, beneficial effects of the present invention are shown:
1, cementitious material is uniformly wrapped in aggregate surface by the present invention, starch film is formed on cementitious material surface, by the permeable bone
When material is for concrete, it can produce in mixing building and be transported by loading tool to scene, or directly carry out at the scene
Processing, can be effectively reduced the quality fluctuation of concrete；The selection of loading tool is not limited only to tank car, can reduce transportation cost, and
During transportation, remaining slurry will not be generated, not will cause waste and pollution；This permeable aggregate engineering less for dosage, dimension
The engineering repairing engineering and constructing in the inconvenient place of communications and transportation is especially convenient.
2, using modified starch, the very poor disadvantage of common starch water resistance is improved, there is its film forming preferably continuous
Property, compact structure, quality is fine and smooth, has apparent water resistance.
Solvent is Isosorbide-5-Nitrae-dioxane, methylene chloride, chloroform or acetone, so that the film compactness formed is poor, is met
The decomposition rate of water is very fast.
Modified starch is dissolved in Isosorbide-5-Nitrae-dioxane, methylene chloride, chloroform or acetone, there is the starch film to be formed
Certain water resistance, but meet and do not need the too long time after water and just start to decompose, reach balance therebetween, controls permeable aggregate
The integrality and its hydrolysis time of surface starch film be decomposed starch film will not just completely during transportation, can be guaranteed pair
The protective effect of permeable aggregate.
3, the starch film liquid quality fraction formed is conducive to the resolving time for controlling starch film, meets coagulation in 1%-5%
Geotechnological journey uses the requirement of the permeable aggregate to the starch film resolving time, it is ensured that before construction, which will not divide completely
It solves, film is just decomposed in work progress.
4, starch film with a thickness of 10 μm -20 μm, further control the integrality and its water of permeable aggregate surface starch film
The time is solved, permeable aggregate is decomposed will not just completely during transportation, can guarantee the protective effect to permeable aggregate.
5, the cementitious material that the present invention uses includes cement, reinforcing material, water-reducing agent and latex powder, passes through control gelling material
Part ratio between the type and material of material, so that obtaining maximum porosity while obtaining optimal concrete strength；Glue
Gel material type is less, so that puddling fluctuation that is more uniform, while reducing cementitious material, save the cost.
6, as reinforcing agent, the specific surface area of the two is all very big, can effectively fill water for silicon powder or/and nano silica
Mud internal void increases its compactness, improves the cementation interface intensity between cement slurry and aggregate, while its higher reaction is lived
Property can promote late strength of concrete steady growth.
7, aggregate is the rubble of partial size 5-10mm, guarantees the intensity and good water penetration of concrete.
8, during preparing permeable aggregate, aggregate surface dehydrated alcohol is sprayed complete wetting, dehydrated alcohol will not
Hydration reaction occurs with cementitious material, and is easy to volatilize, it is any anti-convenient for not occurring in the mixed process of aggregate and cementitious material
It answers.
Specific embodiment
Embodiment 1
As a better embodiment of the invention, the present invention includes a kind of permeable aggregate for concrete, includes cementitious material
And aggregate, it is characterised in that: the aggregate outer surface is uniformly enclosed with cementitious material, and the cementitious material outer surface is enclosed with shallow lake
Powder film, the starch film is starch film spray solution dry formation behind cementitious material outer surface that mass fraction is 1%, described
Starch coating solution is dissolved in solvent for modified starch to be obtained.
The solvent is 1,4- dioxane；Modified starch is obtained through cornstarch esterification modification, modified starch degree of substitution
1.0；The cementitious material includes 94 parts of P.O42.5 cement, 5 parts of silicon powder, 0.9 part of latex powder, 0.1 part of water-reducing agent；The aggregate
For the rubble of partial size 10mm.
The latex powder is redispersable latex powder, and the water-reducing agent is powder polycarboxylic acids water reducing agent, and water-reducing rate is greater than
25%。
A kind of above-mentioned permeable aggregate processing method for concrete, it is characterised in that: the following steps are included:
A. cementitious material is stirred evenly, including 94 parts of P.O42.5 cement, 5 parts of silicon powder, 0.9 part of latex powder, water-reducing agent 0.1
Part；Using it is mechanical with pneumatically mix by the way of carry out, to guarantee to be uniformly mixed, the time of puddling of material per ton is 15 minutes；
B. aggregate surface dehydrated alcohol is sprayed complete wetting；
C. cementitious material is mixed with the aggregate of wetting, aggregate surface is made uniformly to wrap up cementitious material；
D. modified starch is dissolved in and obtains the starch coating solution that mass fraction is 1% in 1,4- dioxane；Through 0.45 μm of filter
Film filtering；
E. it by filtered starch film spray solution to the cementitious material surface for being enclosed with aggregate, is dried, forms 20 μ m-thicks
Starch film, permeable aggregate is made.
A kind of pervious concrete using above-mentioned permeable aggregate production, it is characterised in that: including 97 parts of permeable aggregates, 19
Part it is primary with water and 3 parts of seconary water use；Described to be once used for starch-splitting film with water, the seconary water use is for making to be gelled
Hydration reaction occurs for material.
A method of pervious concrete is made using above-mentioned permeable aggregate, it is characterised in that: the following steps are included:
A. 97 parts of permeable aggregate is tiled, the primary of 19 parts of sprinkling uses water, decomposes the starch film of permeable aggregate surface；
B. once at 7 minutes, the seconary water use of 3 parts of sprinkling makes the cementitious material in permeable aggregate that aquation occur anti-after water
It answers；
C. ultrasonic wave vibration compacting is used, is conserved, pervious concrete is formed.
Embodiment 2
As another better embodiment of the present invention, the present invention includes a kind of permeable aggregate for concrete, includes gelling material
Material and aggregate, it is characterised in that: the aggregate outer surface is uniformly enclosed with cementitious material, and the cementitious material outer surface is enclosed with
Starch film, the starch film are that the starch film spray solution that mass fraction is 3% dries formation, institute behind cementitious material outer surface
Stating starch coating solution is that modified starch is dissolved in solvent and obtaining.
The solvent is chloroform；Modified starch is obtained through potato starch esterification modification, modified starch degree of substitution
0.5；The cementitious material includes 90 parts of P.O52.5 cement, 8 parts of nano silica, 1.7 parts of latex powder, 0.3 part of water-reducing agent；
The aggregate is the rubble of partial size 5mm.
The latex powder is redispersable latex powder, and the water-reducing agent is powder polycarboxylic acids water reducing agent, and water-reducing rate is greater than
25%。
A kind of above-mentioned permeable aggregate processing method for concrete, it is characterised in that: the following steps are included:
A. cementitious material is stirred evenly, including 90 parts of P.O52.5 cement, 8 parts of nano silica, 1.7 parts of latex powder, subtracted
0.3 part of aqua；Using it is mechanical with pneumatically mix by the way of carry out, to guarantee to be uniformly mixed, the time of puddling of material per ton is 15
Minute；
B. aggregate surface dehydrated alcohol is sprayed complete wetting；
C. cementitious material is mixed with the aggregate of wetting, aggregate surface is made uniformly to wrap up cementitious material；
D. modified starch is dissolved in and obtains the starch coating solution that mass fraction is 1% in chloroform；Through 0.45 μm of filter membrane mistake
Filter；
E. it by filtered starch film spray solution to the cementitious material surface for being enclosed with aggregate, is dried, forms 15 μ m-thicks
Starch film, permeable aggregate is made.
A kind of pervious concrete using above-mentioned permeable aggregate production, it is characterised in that: including 95 parts of permeable aggregates, 15
Part it is primary with water and 5 parts of seconary water use；Described to be once used for starch-splitting film with water, the seconary water use is for making to be gelled
Hydration reaction occurs for material.
A method of pervious concrete is made using above-mentioned permeable aggregate, it is characterised in that: the following steps are included:
A. 95 parts of permeable aggregate is tiled, the primary of 15 parts of sprinkling uses water, decomposes the starch film of permeable aggregate surface；
B. once at 5 minutes, the seconary water use of 5 parts of sprinkling makes the cementitious material in permeable aggregate that aquation occur anti-after water
It answers；
C. ultrasonic wave vibration compacting is used, is conserved, pervious concrete is formed.
Embodiment 3
As the another better embodiment of the present invention, the present invention includes a kind of permeable aggregate for concrete, includes gelling material
Material and aggregate, it is characterised in that: the aggregate outer surface is uniformly enclosed with cementitious material, and the cementitious material outer surface is enclosed with
Starch film, the starch film are that the starch film spray solution that mass fraction is 5% dries formation, institute behind cementitious material outer surface
Stating starch coating solution is that modified starch is dissolved in solvent and obtaining.
The solvent is acetone；Modified starch is obtained through tapioca esterification modification, modified starch degree of substitution 0；The glue
Gel material includes 88 parts of P.O52.5 cement, 4 parts of nano silica, 6 parts of silicon powder, 1.5 parts of latex powder, 0.5 part of water-reducing agent；Institute
State the rubble that aggregate is partial size 10mm.
The latex powder is redispersable latex powder, and the water-reducing agent is powder polycarboxylic acids water reducing agent, and water-reducing rate is greater than
25%。
A kind of above-mentioned permeable aggregate processing method for concrete, it is characterised in that: the following steps are included:
A. cementitious material is stirred evenly, including 88 parts of P.O52.5 cement, 4 parts of nano silica, 6 parts of silicon powder, latex powder
1.5 parts, 0.5 part of water-reducing agent；Using it is mechanical with pneumatically mix by the way of carry out, uniformly mixed to guarantee, material per ton is puddled
Time is 15 minutes；
B. aggregate surface dehydrated alcohol is sprayed complete wetting；
C. cementitious material is mixed with the aggregate of wetting, aggregate surface is made uniformly to wrap up cementitious material；
D. modified starch is dissolved in and obtains the starch coating solution that mass fraction is 5% in acetone；Through 0.45 μm of membrane filtration；
E. it by filtered starch film spray solution to the cementitious material surface for being enclosed with aggregate, is dried, forms 10 μ m-thicks
Starch film, permeable aggregate is made.
A kind of pervious concrete using above-mentioned permeable aggregate production, it is characterised in that: including 93 parts of permeable aggregates, 9
Part it is primary with water and 7 parts of seconary water use；Described to be once used for starch-splitting film with water, the seconary water use is for making to be gelled
Hydration reaction occurs for material.
A method of pervious concrete is made using above-mentioned permeable aggregate, it is characterised in that: the following steps are included:
A. 93 parts of permeable aggregate is tiled, the primary of 9 parts of sprinkling uses water, decomposes the starch film of permeable aggregate surface；
B. once at 4 minutes, the seconary water use of 7 parts of sprinkling makes the cementitious material in permeable aggregate that aquation occur anti-after water
It answers；
C. ultrasonic wave vibration compacting is used, is conserved, pervious concrete is formed.
Embodiment 4
As a better embodiment of the invention, the present invention includes a kind of permeable aggregate for concrete, includes cementitious material
And aggregate, it is characterised in that: the aggregate outer surface is uniformly enclosed with cementitious material, and the cementitious material outer surface is enclosed with shallow lake
Powder film, the starch film is starch film spray solution dry formation behind cementitious material outer surface that mass fraction is 3%, described
Starch coating solution is dissolved in solvent for modified starch to be obtained.
The solvent is methylene chloride；Modified starch is obtained through rice starch esterification modification, modified starch degree of substitution 1.0；
The cementitious material includes 89 parts of P.O52.5 cement, 9 parts of silicon powder, 1.6 parts of latex powder, 0.4 part of water-reducing agent；The aggregate is grain
The rubble of diameter 10mm.
The latex powder is redispersable latex powder, and the water-reducing agent is powder polycarboxylic acids water reducing agent, and water-reducing rate is greater than
25%。
A kind of above-mentioned permeable aggregate processing method for concrete, it is characterised in that: the following steps are included:
A. cementitious material is stirred evenly, including 89 parts of P.O52.5 cement, 9 parts of silicon powder, 1.6 parts of latex powder, water-reducing agent 0.4
Part；Using it is mechanical with pneumatically mix by the way of carry out, to guarantee to be uniformly mixed, the time of puddling of material per ton is 15 minutes；
B. aggregate surface dehydrated alcohol is sprayed complete wetting；
C. cementitious material is mixed with the aggregate of wetting, aggregate surface is made uniformly to wrap up cementitious material；
D. modified starch is dissolved in and obtains the starch coating solution that mass fraction is 3% in methylene chloride；Through 0.45 μm of filter membrane mistake
Filter；
E. it by filtered starch film spray solution to the cementitious material surface for being enclosed with aggregate, is dried, forms 20 μ m-thicks
Starch film, permeable aggregate is made.
A kind of pervious concrete using above-mentioned permeable aggregate production, it is characterised in that: including 96 parts of permeable aggregates, 16
Part it is primary with water and 4 parts of seconary water use；Described to be once used for starch-splitting film with water, the seconary water use is for making to be gelled
Hydration reaction occurs for material.
A method of pervious concrete is made using above-mentioned permeable aggregate, it is characterised in that: the following steps are included:
A. 96 parts of permeable aggregate is tiled, the primary of 16 parts of sprinkling uses water, decomposes the starch film of permeable aggregate surface；
B. once at 6 minutes, the seconary water use of 4 parts of sprinkling makes the cementitious material in permeable aggregate that aquation occur anti-after water
It answers；
C. ultrasonic wave vibration compacting is used, is conserved, pervious concrete is formed.
Pervious concrete obtained is detected to the compression strength and coefficient of permeability of 28 day age, what the embodiment of the present invention obtained
Pervious concrete index such as the following table 1:
1 pervious concrete performance indicator of table
The above test data shows that pervious concrete performance indexes of the invention fully meets design requirement, can be realized city
The requirement of fieldization application.Guaranteeing coefficient of permeability and while intensity, can effectively solve that pervious concrete quality fluctuation is big, transport
The problems such as at high cost, remaining slurry waste and pollution, convenient for construction.
In conclusion after those skilled in the art read file of the present invention, according to the technique and scheme of the present invention with
Other various corresponding conversion schemes that technical concept is made without creative mental labour belong to what the present invention was protected
Range.
Claims (10)
1. a kind of permeable aggregate for concrete includes cementitious material and aggregate, it is characterised in that: the aggregate outer surface is equal
Even to be enclosed with cementitious material, the cementitious material outer surface is enclosed with starch film, and the starch film is that mass fraction is 1%-5%'s
Starch film spray solution is dry behind cementitious material outer surface to be formed, and the starch coating solution is dissolved in solvent for modified starch to be obtained
It arrives.
2. a kind of permeable aggregate for concrete according to claim 1, it is characterised in that: the solvent is Isosorbide-5-Nitrae-two
Six ring of oxygen, methylene chloride, chloroform or acetone.
3. a kind of permeable aggregate for concrete according to claim 2, it is characterised in that: the modified starch is through jade
Rice starch, potato starch, tapioca or rice starch esterification modification obtain.
4. a kind of permeable aggregate for concrete according to claim 3, it is characterised in that: the thickness of the starch film
It is 10 μm -20 μm.
5. a kind of permeable aggregate for concrete according to claim 1 or 4, it is characterised in that: the cementitious material
Including 88~94 parts of cement, 5~10 parts of reinforcing material, 0.1~0.5 part of water-reducing agent, 0.9~1.7 part of latex powder.
6. a kind of permeable aggregate for concrete according to claim 5, it is characterised in that: the reinforcing material is silicon
One or both of powder, nano silica.
7. a kind of permeable aggregate for concrete according to claim 6, it is characterised in that: the latex powder is can be again
Dispersed latex powder.
8. a kind of permeable aggregate for concrete according to claim 7, it is characterised in that: the cement is ordinary silicon
Acid salt cement, grade are 42.5 or 52.5.
9. a kind of permeable aggregate for concrete according to claim 8, it is characterised in that: the aggregate is partial size 5-
The rubble of 10mm.
10. utilizing a kind of permeable aggregate processing method for concrete described in claim 1 or 9, it is characterised in that: packet
Include following steps:
A. cementitious material is stirred evenly；
B. aggregate surface dehydrated alcohol is sprayed complete wetting；
C. cementitious material is mixed with the aggregate of wetting, aggregate surface is made uniformly to wrap up cementitious material；
D., modified starch is dissolved in the starch coating solution for obtaining that mass fraction is 1%-5% in solvent；
E. it by starch film spray solution to the cementitious material surface for being enclosed with aggregate, is dried, forms starch film, be made
Water aggregate.
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| CN113152193A (en) * | 2021-04-25 | 2021-07-23 | 中冶南方城市建设工程技术有限公司 | Novel permeable concrete preparation method |
| CN113443879A (en) * | 2021-07-24 | 2021-09-28 | 陕西秦汉恒盛新型建材科技股份有限公司 | Lightweight aggregate concrete produced by utilizing recycled lightweight aggregate and production process thereof |
| CN113443879B (en) * | 2021-07-24 | 2022-09-30 | 陕西秦汉恒盛新型建材科技股份有限公司 | Lightweight aggregate concrete produced by utilizing recycled lightweight aggregate and production process thereof |
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