CN104829158A - Sprayed concrete viscosity adjusting agent, preparation method and applications thereof - Google Patents
Sprayed concrete viscosity adjusting agent, preparation method and applications thereof Download PDFInfo
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- CN104829158A CN104829158A CN201510207782.0A CN201510207782A CN104829158A CN 104829158 A CN104829158 A CN 104829158A CN 201510207782 A CN201510207782 A CN 201510207782A CN 104829158 A CN104829158 A CN 104829158A
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Abstract
The invention provides a sprayed concrete viscosity adjusting agent, a preparation method and applications thereof. The sprayed concrete viscosity adjusting agent is composed of a component A and a component B, wherein the component A is composed of 70 to 90 parts by weight of condensation type water reducer, and the component B is composed of 3 to 6 parts by weight of linear polymer with a low molecular weight and 8 to 25 parts by weight of linear polymer with a high molecular weight. The provided sprayed concrete viscosity adjusting agent can increase the thickness of concrete layer after primary spraying without affecting the post strength of the sprayed concrete, and greatly reduce the rebound degree of sprayed concrete.
Description
Technical field
The present invention relates to a kind of sprayed concrete viscosity modifier, its preparation method and application thereof, belong to technical field of concrete additives.
Background technology
Sprayed concrete is a kind of material reinforced for body structure surface, is widely used in underground works, mine engineering, side slope consolidation projects and emergency work.Sprayed concrete is in construction process, and need there is stronger cohesive force with body structure surface, and keep enough low rebound degree, for this reason, accelerating chemicals is developed and is applied in sprayed concrete.Accelerating chemicals was divided into for two generations, and first-generation accelerating chemicals generates highly basic mainly through hydrolysis and accelerates hydrated cementitious, thus impels concrete rapid coagulation to harden, but, first-generation accelerating chemicals alkalescence is high, and easily produce corrodibility damage to workmen's health, the highly basic simultaneously brought into very easily causes alkali-aggregate reaction.
S-generation accelerating chemicals is non-alkali, makes concrete rapid coagulation mainly through forming a large amount of ettringite in cement slurry, although solve the too high problem of first-generation accelerating chemicals basicity, can it also significantly reduces the later strength of sprayed concrete simultaneously.
For the problem that accelerating chemicals causes sprayed concrete later strength to decline, an effective solution route is exactly that development of new sprays coagulation viscosity modifier, part replaces or replaces accelerating chemicals completely, on the basis not affecting the development of sprayed concrete later strength, by significantly improving the viscosity of sprayed concrete, reach the object reducing rebound of shotcrete rate.
Summary of the invention
Rebound degree for existing sprayed concrete is too high, and the problem that later strength declines, the invention provides a kind of sprayed concrete viscosity modifier, its preparation method and application thereof, on the basis not reducing sprayed concrete later strength, improve a jetting thickness, significantly reduce the rebound degree of sprayed concrete.
Sprayed concrete viscosity modifier of the present invention, is made up of component A and B component, in mass parts,
Described component A is condensation polymer type water reducer, accounts for 70 ~ 90 parts;
Described condensation polymer type water reducer is any one in naphthalenesulfonate condensation compound water reducer, sulfonated phenolic condenses water reducer, anthracene sulfonic acid salt condenses water reducer or several with the mixture of arbitrary proportion mixing arbitrarily;
Described condensation polymer type water reducer, water-reducing rate is more than 15%;
Described B component comprises lower molecular weight linear polymer and Linear Polymer polymkeric substance, and described lower molecular weight linear polymer accounts for 3 ~ 6 parts, and described high molecular weight linear polymkeric substance accounts for 8 ~ 25 parts;
Described lower molecular weight linear polymer is polyoxyethylene glycol or poly glycol monomethyl ether; The number-average molecular weight of described polyoxyethylene glycol is 3000 ~ 6000, and the number-average molecular weight of poly glycol monomethyl ether is 3000 ~ 6000;
Described high molecular weight linear polymkeric substance is polyoxyethylene, and the number-average molecular weight of described polyoxyethylene is 100,000 ~ 700,000.
The preparation method of sprayed concrete viscosity modifier of the present invention is as follows:
Step (1): preparation component A, mixes described component A;
Step (2): namely preparation B component, evenly obtain described B component by lower molecular weight linear polymer and high molecular weight linear mixed with polymers.
In the storage process of sprayed concrete viscosity modifier of the present invention, component A and B component separately need be stored.
The application method of sprayed concrete viscosity modifier of the present invention is as follows: be first mixed in concrete gel material by component A, after add B component; Or add component A and B component simultaneously; Described sprayed concrete viscosity modifier mixes in sprayed concrete mixture according to 2% ~ 5% of sprayed concrete gelling material quality.
Present invention utilizes the collaborative thickening effect between condensation polymer type water reducer and linear polymer.In cement slurry, aromatic group in condensation polymer type economization agent molecule and the alkyl in linear polymer molecules can produce σ-π hyperconjugation, thus define supramolecular network structure, inner through cement slurry, substantially increase the viscosity of cement slurry, the supramolecular network structure formed can't change hydrolysis product of cement and form, and thus there is no negative impact to the development of cement slurry intensity, namely can not affect the later strength of sprayed concrete.
Beneficial effect:
Sprayed concrete viscosity modifier of the present invention can reduce the rebound degree of sprayed concrete, improves a jetting thickness, to sprayed concrete later strength without negative impact; Rebound of shotcrete rate≤8% can be made, a jetting thickness >=400mm, 28 days compressive strength rates are greater than >=and 100%.
Embodiment
According to following example item, can better understand the present invention.But those skilled in the art is easier to understand, concrete material ratio, processing condition and result thereof described in enforcement only for illustration of the present invention, and should can not limit the present invention described in detail in claim yet.
Each component used in the present invention is commercially produced product, can commercially buy.
Naphthalenesulfonate condensation compound water reducer in following embodiment, sulfonated phenolic condenses water reducer and anthracene sulfonic acid salt condenses water reducer are the JM series product bought from Jiangsu Subotexin Material Co., Ltd.Polyoxyethylene glycol and polyoxyethylene are the PEG series product bought from Nanjing Zhong Xu Chemical Co., Ltd..Cement, sand and stone are bought from little Ye Tian cement mill, Nanjing.Nano silicon is bought from Haitai Nano Material Co., Ltd., Nanjing.
The proportioning of sprayed concrete mixture described in embodiment 1 ~ 4 as following table 1, cement: little Ye field, south of the River P.O42.5; Nano silicon: particle diameter≤200nm; Sand: fineness modulus 2.6; Stone: 5-15mm rubble.
Table 1 sprayed concrete mixture proportioning
Embodiment 1:
A kind of sprayed concrete viscosity modifier, component is counted with mass parts:
Naphthalenesulfonate condensation compound water reducer 76 parts;
Polyoxyethylene glycol 3 parts;
Polyoxyethylene 21 parts.
Wherein the water-reducing rate of naphthalenesulfonate condensation compound water reducer is 20%.
Wherein polyoxyethylene glycol number-average molecular weight is 3500, and polyoxyethylene number-average molecular weight is 400,000.
Mix in sprayed concrete mixture according to 4.5% of sprayed concrete gelling material quality.
Embodiment 2:
A kind of sprayed concrete viscosity modifier, component is counted with mass parts:
Sulfonated phenolic condenses water reducer 80 parts;
Poly glycol monomethyl ether 5 parts;
Polyoxyethylene 15 parts.
Wherein the water-reducing rate of sulfonated phenolic condenses water reducer is 18%.
Wherein poly glycol monomethyl ether number-average molecular weight is 5000, and polyoxyethylene number-average molecular weight is 450,000.
Mix in sprayed concrete mixture according to 3% of sprayed concrete gelling material quality.
Embodiment 3:
A kind of sprayed concrete viscosity modifier, component is counted with mass parts:
Sulfonated phenolic condenses water reducer 82 parts;
Poly glycol monomethyl ether 6 parts;
Polyoxyethylene 12 parts.
Wherein the water-reducing rate of sulfonated phenolic condenses water reducer is 18%.
Wherein poly glycol monomethyl ether number-average molecular weight is 4000, and polyoxyethylene number-average molecular weight is 500,000.
Mix in sprayed concrete mixture according to 3.5% of sprayed concrete gelling material quality.
Embodiment 4:
A kind of sprayed concrete viscosity modifier, component is counted with mass parts:
Anthracene sulfonic acid salt condenses water reducer 77 parts;
Poly glycol monomethyl ether 5 parts;
Polyoxyethylene 18 parts.
Wherein the water-reducing rate of anthracene sulfonic acid salt condenses water reducer is 16%.
Wherein poly glycol monomethyl ether number-average molecular weight is 5500, and polyoxyethylene number-average molecular weight is 650,000.
Mix in sprayed concrete mixture according to 3.5% of sprayed concrete gelling material quality.
Embodiment 1 ~ 4 gained sprayed concrete mixture, the property indices of its sprayed concrete is as shown in table 2 below.Require to test with reference to GB50086-2001 " Technical code for shotcrete rock bolts shore ".
The property indices of table 2 embodiment 1 ~ 4
| Sequence number | Rebound degree (%) | A jetting thickness (mm) | 28 days compressive strength rates (%) |
| Embodiment 1 | 7.6 | 450 | 102% |
| Embodiment 2 | 7.3 | 470 | 106% |
| Embodiment 3 | 6.9 | 520 | 105% |
| Embodiment 4 | 6.7 | 550 | 105% |
Increase the operating efficiency that jetting thickness can improve sprayed concrete, reduce the waste of concrete material when rebound degree can reduce sprayed construction.A jetting thickness and these two indexs of rebound degree and sprayed concrete viscosity closely bound up.From experimental result in table 2, the sprayed concrete in embodiment 1 ~ 4 28 days compressive strength rates be greater than >=100% situation under, its rebound degree≤8%, a jetting thickness >=400mm.
Claims (3)
1. a sprayed concrete viscosity modifier, is characterized in that, is made up of component A and B component, in mass parts,
Described component A is condensation polymer type water reducer, accounts for 70 ~ 90 parts;
Described condensation polymer type water reducer is any one in naphthalenesulfonate condensation compound water reducer, sulfonated phenolic condenses water reducer, anthracene sulfonic acid salt condenses water reducer or several with the mixture of arbitrary proportion mixing arbitrarily;
Described condensation polymer type water reducer, water-reducing rate is more than 15%;
Described B component comprises lower molecular weight linear polymer and Linear Polymer polymkeric substance, and described lower molecular weight linear polymer accounts for 3 ~ 6 parts, and described high molecular weight linear polymkeric substance accounts for 8 ~ 25 parts;
Described lower molecular weight linear polymer is polyoxyethylene glycol or poly glycol monomethyl ether; The number-average molecular weight of described polyoxyethylene glycol is 3000 ~ 6000, and the number-average molecular weight of poly glycol monomethyl ether is 3000 ~ 6000;
Described high molecular weight linear polymkeric substance is polyoxyethylene, and the number-average molecular weight of described polyoxyethylene is 100,000 ~ 700,000.
2. the preparation method of sprayed concrete viscosity modifier described in claim 1, it is characterized in that, concrete steps are as follows:
Step (1): preparation component A, mixes described component A and obtain component A;
Step (2): namely preparation B component, evenly obtain described B component by lower molecular weight linear polymer and high molecular weight linear mixed with polymers;
In the storage process of described sprayed concrete viscosity modifier, component A and B component separately need be stored.
3. the application method of sprayed concrete viscosity modifier described in claim 1, is characterized in that concrete steps are as follows: be first mixed in concrete gel material by component A, after add B component; Or add component A and B component simultaneously; Described sprayed concrete viscosity modifier mixes in sprayed concrete mixture according to 2% ~ 5% of sprayed concrete gelling material quality.
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| CN201510207782.0A CN104829158B (en) | 2015-04-28 | 2015-04-28 | Gunite concrete viscosity modifier, its preparation method and its application |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106904861A (en) * | 2016-12-17 | 2017-06-30 | 无锡金斯顿新材料科技有限公司 | A kind of viscosity modifier of utilization HMW polycarboxylic acids control concrete water bleeding and its application |
| CN114988752A (en) * | 2022-06-28 | 2022-09-02 | 中国水利水电第七工程局有限公司 | Preparation and use method of composition for reducing rebound of sprayed concrete |
Citations (7)
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| CN1084836A (en) * | 1992-07-22 | 1994-04-06 | 山道士有限公司 | The gelling composition of good workability |
| CN1146193A (en) * | 1994-02-22 | 1997-03-26 | 花王株式会社 | Hydraulic composition and process for producing the same |
| US5911819A (en) * | 1995-03-16 | 1999-06-15 | Mbt Holding Ag | Cement spraying admixture |
| JP2001181000A (en) * | 1999-12-21 | 2001-07-03 | Denki Kagaku Kogyo Kk | Rebound decreasing agent, cement concrete, method of manufacturing cement concrete and spraying process using them |
| CN1376138A (en) * | 1999-08-26 | 2002-10-23 | 詹姆斯·哈迪研究有限公司 | Extrudable cementatious material |
| JP4484644B2 (en) * | 2004-09-15 | 2010-06-16 | 太平洋マテリアル株式会社 | Spray material and construction method of spray material |
| CN102464466A (en) * | 2010-11-02 | 2012-05-23 | 淮南矿业(集团)有限责任公司 | Shotcrete additive and spraying technology of shotcrete |
-
2015
- 2015-04-28 CN CN201510207782.0A patent/CN104829158B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1084836A (en) * | 1992-07-22 | 1994-04-06 | 山道士有限公司 | The gelling composition of good workability |
| CN1146193A (en) * | 1994-02-22 | 1997-03-26 | 花王株式会社 | Hydraulic composition and process for producing the same |
| US5911819A (en) * | 1995-03-16 | 1999-06-15 | Mbt Holding Ag | Cement spraying admixture |
| CN1376138A (en) * | 1999-08-26 | 2002-10-23 | 詹姆斯·哈迪研究有限公司 | Extrudable cementatious material |
| JP2001181000A (en) * | 1999-12-21 | 2001-07-03 | Denki Kagaku Kogyo Kk | Rebound decreasing agent, cement concrete, method of manufacturing cement concrete and spraying process using them |
| JP4484644B2 (en) * | 2004-09-15 | 2010-06-16 | 太平洋マテリアル株式会社 | Spray material and construction method of spray material |
| CN102464466A (en) * | 2010-11-02 | 2012-05-23 | 淮南矿业(集团)有限责任公司 | Shotcrete additive and spraying technology of shotcrete |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106904861A (en) * | 2016-12-17 | 2017-06-30 | 无锡金斯顿新材料科技有限公司 | A kind of viscosity modifier of utilization HMW polycarboxylic acids control concrete water bleeding and its application |
| CN114988752A (en) * | 2022-06-28 | 2022-09-02 | 中国水利水电第七工程局有限公司 | Preparation and use method of composition for reducing rebound of sprayed concrete |
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| CN104829158B (en) | 2017-03-15 |
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Effective date of registration: 20180329 Address after: Jiangning District of Nanjing City, Jiangsu province 211103 Li Quan Lu No. 118 Patentee after: Jiangsu Jill Mstar Technology Ltd Address before: Jiangning District of Nanjing City, Jiangsu province 211100 Li Quan Lu No. 118 Patentee before: Jiangsu Subute New Materials Co., Ltd. |