CN107555835A - It is a kind of to improve and maintain the additive and preparation method of pervious concrete workability - Google Patents
It is a kind of to improve and maintain the additive and preparation method of pervious concrete workability Download PDFInfo
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- CN107555835A CN107555835A CN201710803557.2A CN201710803557A CN107555835A CN 107555835 A CN107555835 A CN 107555835A CN 201710803557 A CN201710803557 A CN 201710803557A CN 107555835 A CN107555835 A CN 107555835A
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- water
- pervious concrete
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Abstract
The invention discloses a kind of improvement and the additive of pervious concrete workability is maintained, it is prepared using water reducer, cellulose ether, guar gum xanthans copolymer, polyacrylamide, air entraining agent, polymer dispersion powder, retarder, wetting agent as primary raw material.Pervious concrete additive prepared by the present invention is remarkably improved pervious concrete slurry encapsulation and uniformity, water-retaining property, slow down concrete surface moisture evaporation speed, slurry is set to be evenly distributed on aggregate surface, realize that pervious concrete construction 3~5h of operable time arbitrarily regulates and controls, pervious concrete property retention is stable in longer operable time, meets the requirement of premixing long-distance transportation；And the present invention have the characteristics that production technology it is easy, it is cheap, using cost-effective, pollution-free.
Description
Technical field
The invention belongs to construction material and municipal works field, and in particular to one kind improves and maintains pervious concrete to construct
The additive and preparation method of performance.
Background technology
The internal structure of pervious concrete is a series of skeleton group formed by loose structures being connected with extraneous air
Into, compared with hard surface, it has good water permeability, is building physics and the ecological environments such as good sound, light, heat
Aspect has unique advantage, embodies the theory of " with Harmonizing with Environment ", and the primary building material that " sponge city " is built.
China will just have started the research to pervious concrete in the end of the year in last century 70, but because intensity and endurance quality are undesirable, it is middle
It stopped a period of time.Until 2014, firmly the portion of building issued《On printing and distributing sponge urban construction technical manual --- low influence is opened
Send out the notice of storm-water system structure (tentative)》(building city letter (2014) 275), under national policy guiding, pervious concrete
Fast-developing period has been welcome again.
Pervious concrete belongs to dry concrete, due to the evaporation of moisture, its workability can not the long period holding
Even there is the situation that glue material efflorescence can not be cementing in good workability.At present, it is domestic to pervious concrete match ratio and
Construction technology and method etc. have all carried out certain research, summarize its achievement in research and still Railway Project be present：1st, permeable coagulation
Adhesion problem between native aggregate；2nd, working long hours property keeps workability and premixing long-distance transportation problem；3rd, permeable coagulation
Soil paste body package aggregate homogeneity question etc..These problems directly affect pervious concrete efficiency of construction, progress and quality and
Permeability rate, the promotion and application of pervious concrete are constrained, will also bring adverse effect to the construction in " sponge city ".
In view of some problems that pervious concrete is current, develop a kind of improvement and maintain the outer of pervious concrete workability
Add agent, can solve pervious concrete workability retentivity, premixing long-distance transportation, slurry encapsulation and adhesion strength and ask
Topic, promote national " sponge city " development and improve its construction quality.
The content of the invention
The purpose of the present invention is to provide a kind of improvement for above-mentioned the shortcomings of the prior art and maintain permeable coagulation
The additive and preparation method of native workability, the pervious concrete additive can obviously improve the parcel of pervious concrete
Property, slurry viscosity and water-retaining property, there is enhancing binder materials dispersiveness, pervious concrete workability is kept in controllable time,
Convenient construction, ensure construction quality, reduce pervious concrete scrappage the features such as.
To achieve the above object, the technical solution adopted by the present invention is：
A kind of to improve and maintain the additive of pervious concrete workability, its key component includes：Polycarboxylate water-reducer,
Cellulose ether, guar gum-xanthans copolymer, air entraining agent, polymer dispersion powder, polyacrylamide, retarder, wetting agent, water,
Each constitutive material is in terms of its effective content.
Further, it is of the present invention to improve and maintain in the additive of pervious concrete workability, each component and its
Shared mass percent includes：Water reducer 3~7%, cellulose ether 0.2~0.3%, guar gum-xanthans copolymer 0.05~
0.5%th, polyacrylamide 0.05~0.15%, air entraining agent 0.05~0.10%, polymer dispersion powder 1~3%, retarder 0.5
~2%, wetting agent 0.5~1.5%, remaining is water.
Preferably, mass percent shared by the water reducer is 3~5%.
Preferably, the guar gum-mass percent shared by xanthans copolymer is 0.25~5%.
Preferably, mass percent shared by the wetting agent is 1~1.5%.
In such scheme, the water reducer is polycarboxylate water-reducer, and its molecular weight is 40000~60000, and water-reducing rate is not high
In 15%, solid content is not less than 20wt%.
In such scheme, the cellulose ether is hydroxypropyl methyl cellulose ether, its molecular weight is 500000~
1000000。
In such scheme, the guar gum-xanthans copolymer presses 1 by guar gum and xanthans:The mass ratio of (1~3)
It is polymerized, molecular weight ranges 200000-1000000.
In such scheme, the Molecular Weight for Polyacrylamide is 5000~80000.
In such scheme, the air entraining agent is the one or both mixture in Tea Saponin, neopelex, is had
Effect solid content is not less than 98wt%.
In such scheme, the polymer dispersion powder is white powder, and solid content is not less than 98wt%, and ash content is not higher than
10wt%.
In such scheme, the retarder is in organic phosphoric acid, calgon, sodium tripolyphosphate or sodium gluconate
One or more, effective solid content are not less than 50wt%.
Preferably, the organic phosphoric acid is 1-hydroxy ethylidene-1,1-diphosphonic acid.
In such scheme, the wetting agent is glycerine, AR, 99%
A kind of preparation method of above-mentioned additive for improving and maintaining pervious concrete workability, it includes following step
Suddenly：
1) raw material is weighed by proportioning, mass percent shared by each component includes：Water reducer 3~7%, cellulose ether 0.2~
0.3%th, guar gum-xanthans copolymer 0.05~0.5%, polyacrylamide 0.05~0.15%, air entraining agent 0.05~
0.10%th, polymer dispersion powder 1~3%, retarder 0.5~2%, wetting agent 0.5~1.5%, remaining is water；
2) cellulose ether weighed, polyacrylamide, polymer dispersion powder, guar gum-xanthans copolymer are dissolved in one
Gauge water, and the mixed liquor A that stirred to obtain under conditions of 40 DEG C and 400~500r/min, and it is stand-by to be cooled to room temperature；
3) with agitator, reflux condenser reactor in add remaining water and the retarder weighed, air entraining agent,
Start stirring, is heated to 100 DEG C of insulation reaction 2h, is uniformly dissolved and mixed liquid B is made, and in this step, has in retarder
Under the ultra-dispersed effect having, realize that material dispersion is uniform and suppresses bulla and formed；
4) water reducer, mixed liquor A and wetting agent are added dropwise by measuring tank simultaneously into reactor mixed liquid B, by reactant
50~60 DEG C are cooled to, and is stirred under 200~350r/mind speed, is cooled to room temperature, the improvement is produced and ties up
Hold the additive of pervious concrete workability.
In such scheme, mixing time described in step 2) is 15~20min；Mixing time described in step 4) be 5~
10min。
In such scheme, time for adding described in step 4) is 30~40min.
The additive of the present invention for improving and maintaining pervious concrete workability has low water-reducing rate, increase denseness drop
Low viscosity, bleed and slow setting water conservation etc. act on, and main technical principle is as follows：
1) surface energy of liquid is reduced by wetting agent, diminishing component can fully dispersed binder materials reduction binder materials and collection
Transition region defect between material, boundary strength is improved, and select water-reducing rate diminishing component between 5~10%, reduced to water consumption
With the sensitiveness of volume；
2) the bleed component in additive can form the micro-bubble with certain mechanical strength, at the same in cellulose ether and
Bubble stability can be improved in the presence of wetting agent, is advantageous to increase slurry denseness, reduces viscosity, so that slurry uniformly wraps up
On aggregate and be less prone to stream slurry phenomenon；
3) wetting agent can act synergistically with slow setting component, the setting time of delay gelatinizing material, ensure construction operation time；
Reduce the uncontrollable situation of Slow setting time；And its component has the further bubble disintegration of ultra-dispersed effect energy, so as to suppress water
The evaporation divided；
4) wetting agent can form a tunic in the place of binder materials and air contact, so as to slow down the evaporation of moisture, and
It is engaged with bleed component, eventually arrives at the state for keeping the good workability of pervious concrete for a long time, and is obtained preferable
Mechanical property.
Compared with prior art, the beneficial effects of the invention are as follows：
(1) present invention mixes from setting time and water-retaining property aspect delay gelatinizing condensation of materials and suppression pervious concrete
Compound moisture evaporation, efficiently solve due to moisture evaporation and setting time it is uncontrollable cause pervious concrete constructional difficulties, report
The problem of useless rate is higher；
(2) present invention can significantly improve binder materials dispersiveness and viscosity, optimize encapsulation of the slurry in aggregate surface, and
Stream slurry phenomenon is occurred without, reduces binder materials and aggregate Interface transition region defect, the characteristics of can guarantee that stable long-term strength；
(3) present invention can require to be adjusted according to the engineering time, can meet the requirement of premixing long-distance transportation, raising is applied
Work efficiency rate, there is obvious economic benefit and social benefit.
Embodiment
The content of invention is furtherd elucidate to the present invention below by way of embodiment, but the present invention not only limits to
In the following examples.
In following examples, the average moisture of pervious concrete average moisture evaporation rate σ test pervious concretes is introduced
Evaporation rate；The average moisture evaporation rate σ is defined as 1kg pervious concretes mix in unit interval unit area moisture
Evaporation capacity, area is that pervious concrete exposed area Uniform provisions are projected area in definition 1.3 times；Specific method of testing
For：Weigh a certain amount of pervious concrete mixture M1；It is paved in 1 × 1cm naturally2The square 400cm of composition2Profit
On wet iron plate, its pervious concrete mixture of number accounts for N number of 1 × 1cm2Grid (exceed half calculation one, otherwise)；It will be loaded with again
The iron plate of water coagulation soil mixture is put into the climatic chamber that environment temperature is 30 DEG C, relative humidity is 60%；(n after n hours
=3) its mixture mass M is claimed2；Pervious concrete average moisture evaporation rate can be calculated：σ=(M1-M2)/nN=(M1-
M2)/3.9N。
In following examples, consider that pervious concrete slurry denseness is close with consistency of mortar, with reference to JGJ/T7《Building mortar
Basic performance tests method standard》Middle consistency of mortar assay method is measured sign；Selection is surveyed using mortar consistency determining apparatus
Fixed gained pervious concrete slurry denseness, uses when testing pervious concrete slurry denseness and is measured with proportioning slurry.
In following embodiments, for polycarboxylate water-reducer its molecular weight used for 60000 or so, solid content is 25% and diminishing
Rate is 13%；Cellulose ether is ethoxyl methyl cellulose ether, and its molecular weight is 600000；Guar gum-xanthans copolymer by
Commercially available guar gum and xanthans press 1:3 mass ratio mixing, it is polymerized, molecular weight 200000；Polyacrylamide (PAM) its
Molecular weight is 10000；Its effective solid content of Tea Saponin, neopelex and polymer dispersion powder is not less than 98wt%；
Sodium tripolyphosphate and sodium gluconate its active ingredient are not less than 60wt%, and 1-hydroxy ethylidene-1,1-diphosphonic acid its active component is not less than
50wt%；Glycerine is AR, 99%.
Embodiment 1~4
Embodiment 1~4 is described to be improved and maintains the additive of pervious concrete workability, and its raw material proportioning is shown in Table 1, its
Preparation method comprises the following steps：
1) matched as described in table 1 and weigh each raw material respectively；
2) cellulose ether, polyacrylamide, polymer dispersion powder, guar gum-xanthans copolymer are dissolved in and weigh water
60%, and mixed liquor A is made in stirring 20min under conditions of 40 DEG C and 500r/min, and it is stand-by to be cooled to room temperature；
3) with agitator, reflux condenser reactor in add remaining water and formula metering retarder,
Air entraining agent, start stirring, is heated to 100 DEG C, insulation reaction 2h, is uniformly dissolved and mixed liquid B is made；
4) polycarboxylate water-reducer, mixed liquor A and wetting agent are added dropwise by measuring tank simultaneously into reactor mixed liquid B,
Dripped off in 30min, reactant is cooled to 60 DEG C, and 10min is stirred under 350r/min stir speed (S.S.)s, be cooled to room temperature, i.e.,
Obtain the improvement and maintain the additive of pervious concrete workability.
Raw material component proportion/% in 1 embodiment of table, 1~4 additive
Comparative example 1~3
Below by comparative example is quoted, further to protrude and illustrate the features of the present invention, comparative example 1~4 is described permeable
The raw material proportioning of concrete admixture is shown in Table 2, and its preparation method is identical with embodiment 1~4.
Raw material components proportioning/% of 2 comparative example of table, 1~4 pervious concrete additive
With reference to CJJ/T135《Water-permeable cement concrete pavement technique code》Requirement, by embodiment 1~4 and comparative example 1
~4 gained additives are respectively applied to pervious concrete, and test job performance respectively；Benchmark group does not mix any additive；Power
Performance is learned with reference to GB/T 50081《Standard for test methods of mechanical properties of ordinary concrete》Tested；Benchmark group and incorporation are outer
The service behaviour of gained pervious concrete and mechanical performance index test result after agent is added to be shown in Table 3 and table 4 respectively.It is described permeable mixed
The mass ratio for coagulating soil is C:G:W=380:1600:(104~115).
Table 3 uses the workability and mechanical performance index of pervious concrete obtained by 1~4 additive of embodiment
Table 4 uses the workability and mechanical performance index of pervious concrete obtained by 1~4 additive of comparative example
The above results show：After additive of the present invention is mixed in pervious concrete mixture, mix can obviously reduce
The evaporation rate of moisture in thing, and the presetting period also have obvious delay, effectively construct operable time significantly extend；It is permeable
Concrete mix state makes slurry equably be wrapped in aggregate surface, and particles of aggregates is almost independently existing without conglomeration and stream slurry
As；Pervious concrete mixture is relatively low to water consumption sensitiveness, in 5~10kg/m3Mixture state change unobvious；Illustrate this
Invention maintains workability with hyposensitivity, improvement and long period, improves the characteristics of its mechanical property；Its in work progress
Open hour are 1.5~4h, and slurry wraps up uniform aggregate independent dispersion, easy for construction, effectively raises efficiency of construction.
Show with comparative example comparing result：Bleed component and wetting agent combination can effectively improve pervious concrete mixture
Workability, good workability are more beneficial for the development of mechanical property；Cellulose ether and guar gum-xanthans copolymer can be effective
Reduction moisture evaporation speed；Retarder can extend binder materials setting time, and be acted synergistically with wetting agent, there is provided for a long time
Transport keeps the precondition of application property；Wetting agent plays a part of reducing surface energy, can integrally improve additive and each group
Divide the contact performance with powder, improve scattered, water conservation and protect plasticity, under the conditions of reaching long-time high-temperature operation, keep well
The purpose of workability.
The general principle and principal character and advantages of the present invention of the present invention has been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally
The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes
Change and improvement is both fallen within the range of claimed invention.The claimed scope of the invention is by affiliated claims
And its equivalent thereof.
Claims (9)
1. a kind of improve and maintain the additive of pervious concrete workability, each component and its shared mass percent include：
Water reducer 3~7%, cellulose ether 0.2~0.3%, guar gum-xanthans copolymer 0.05~0.5%, polyacrylamide 0.05
~0.15%, air entraining agent 0.05~0.10%, polymer dispersion powder 1~3%, retarder 0.5~2%, wetting agent 0.5~
1.5%, remaining is water.
2. additive according to claim 1, it is characterised in that the water reducer is polycarboxylate water-reducer, its molecular weight
For 40000~60000, water-reducing rate is not higher than 15%, and solid content is not less than 20wt%.
3. additive according to claim 1, it is characterised in that the cellulose ether is hydroxypropyl methyl cellulose ether,
Its molecular weight is 500000~1000000.
4. additive according to claim 1, it is characterised in that the guar gum-xanthans copolymer by guar gum and
Xanthans presses 1:The mass ratio of (1~3) is polymerized, molecular weight ranges 200000-1000000.
5. additive according to claim 1, it is characterised in that the Molecular Weight for Polyacrylamide is 5000~80000.
6. additive according to claim 1, it is characterised in that the air entraining agent is Tea Saponin, DBSA
One or both mixture in sodium, effective solid content are not less than 98wt%.
7. additive according to claim 1, it is characterised in that the retarder is organic phosphoric acid, calgon, three
One or more in polyphosphate sodium or sodium gluconate, effective solid content are not less than 50wt%.
8. the preparation method of any one of claim 1~7 additive for improving and maintaining pervious concrete workability, its
It is characterised by, comprises the following steps：
1) raw material is weighed by proportioning, mass percent shared by each component includes：Water reducer 3~7%, cellulose ether 0.2~
0.3%th, guar gum-xanthans copolymer 0.05~0.5%, polyacrylamide 0.05~0.15%, air entraining agent 0.05~
0.10%th, polymer dispersion powder 1~3%, retarder 0.5~2%, wetting agent 0.5~1.5%, remaining is water；
2) cellulose ether weighed, polyacrylamide, polymer dispersion powder, guar gum-xanthans copolymer are dissolved in a certain amount of
Water, and the mixed liquor A that stirred to obtain under conditions of 40 DEG C and 400~500r/min, and it is stand-by to be cooled to room temperature；
3) with agitator, reflux condenser reactor in add remaining water and the retarder weighed, air entraining agent, start shooting
Stirring, is heated to 100 DEG C of insulation reaction 2h, is uniformly dissolved and mixed liquid B is made；
4) water reducer, mixed liquor A and wetting agent are added dropwise simultaneously into reactor mixed liquid B by measuring tank, reactant is cooled
To 50~60 DEG C, and stirred under 200~350r/mind speed, be cooled to room temperature, produced the improvement and maintain
The additive of water coagulation soil workability.
9. preparation method according to claim 8, it is characterised in that 30~40min of time for adding described in step 4).
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108585696A (en) * | 2018-07-11 | 2018-09-28 | 中国十七冶集团有限公司 | A kind of pervious concrete preparation method of anti-moisture evaporation |
| CN109485295A (en) * | 2018-10-29 | 2019-03-19 | 江苏光大生态工程技术有限公司 | A kind of pervious concrete slow setting reinforcing agent and preparation method thereof |
| CN109650768A (en) * | 2019-01-29 | 2019-04-19 | 江苏光大生态工程技术有限公司 | A kind of permeable revetment concrete specialist additive |
| CN109942224A (en) * | 2019-03-23 | 2019-06-28 | 杭州构建新型材料有限公司 | Concrete thickener and its preparation process, application suitable for dry-method sand manufacturing configuration |
| CN110054430A (en) * | 2019-04-04 | 2019-07-26 | 北京盛大风华科技有限公司 | A kind of pervious concrete thickening mentions strong type polycarboxylate water-reducer |
| CN112538396A (en) * | 2020-11-12 | 2021-03-23 | 惠州市麒麟环保材料有限公司 | Novel water-based aluminum template concrete release agent and preparation method thereof |
| CN113060970A (en) * | 2021-05-12 | 2021-07-02 | 北京金隅水泥节能科技有限公司 | Concrete water-retaining agent, preparation method thereof and concrete using concrete water-retaining agent |
| CN114014608A (en) * | 2021-11-11 | 2022-02-08 | 云南中建西部建设有限公司 | Preparation method and construction method of pervious concrete capable of being transported and constructed in ultra-long distance |
| FR3119167A1 (en) * | 2021-01-24 | 2022-07-29 | Ludovic Vinsonneau | Liquid composition for the preparation of pervious concrete, method of use and method of two-layer application of the pervious concrete |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108585696A (en) * | 2018-07-11 | 2018-09-28 | 中国十七冶集团有限公司 | A kind of pervious concrete preparation method of anti-moisture evaporation |
| CN109485295A (en) * | 2018-10-29 | 2019-03-19 | 江苏光大生态工程技术有限公司 | A kind of pervious concrete slow setting reinforcing agent and preparation method thereof |
| CN109650768A (en) * | 2019-01-29 | 2019-04-19 | 江苏光大生态工程技术有限公司 | A kind of permeable revetment concrete specialist additive |
| CN109942224A (en) * | 2019-03-23 | 2019-06-28 | 杭州构建新型材料有限公司 | Concrete thickener and its preparation process, application suitable for dry-method sand manufacturing configuration |
| CN110054430A (en) * | 2019-04-04 | 2019-07-26 | 北京盛大风华科技有限公司 | A kind of pervious concrete thickening mentions strong type polycarboxylate water-reducer |
| CN110054430B (en) * | 2019-04-04 | 2021-07-30 | 北京盛大风华科技有限公司 | Tackifying and strengthening type polycarboxylate water reducer for pervious concrete |
| CN112538396A (en) * | 2020-11-12 | 2021-03-23 | 惠州市麒麟环保材料有限公司 | Novel water-based aluminum template concrete release agent and preparation method thereof |
| FR3119167A1 (en) * | 2021-01-24 | 2022-07-29 | Ludovic Vinsonneau | Liquid composition for the preparation of pervious concrete, method of use and method of two-layer application of the pervious concrete |
| CN113060970A (en) * | 2021-05-12 | 2021-07-02 | 北京金隅水泥节能科技有限公司 | Concrete water-retaining agent, preparation method thereof and concrete using concrete water-retaining agent |
| CN114014608A (en) * | 2021-11-11 | 2022-02-08 | 云南中建西部建设有限公司 | Preparation method and construction method of pervious concrete capable of being transported and constructed in ultra-long distance |
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