CN102503524A - Foam concrete for wet-spraying support of coal mine and preparation method thereof - Google Patents
Foam concrete for wet-spraying support of coal mine and preparation method thereof Download PDFInfo
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- CN102503524A CN102503524A CN201110295259XA CN201110295259A CN102503524A CN 102503524 A CN102503524 A CN 102503524A CN 201110295259X A CN201110295259X A CN 201110295259XA CN 201110295259 A CN201110295259 A CN 201110295259A CN 102503524 A CN102503524 A CN 102503524A
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Abstract
The invention relates to foam concrete for wet-spraying support of a coal mine and a preparation method. The foam concrete comprises a cementing material, water, an admixture and a foaming agent, wherein the cementing material is prepared from cement and fly ash, and the admixture comprises glue, a water reducing agent, an accelerating agent, fiber and cellulose. The invention can produce the foam concrete which not only has light weight and the functions of fire resistance, crack resistance, dynamic pressure resistance and the like, but also has great viscosity, and is particularly suitable for concrete spraying support operation of the coal mines and underground works. The formula can overcome the shortcomings of high rebound degree, large dust, incapability of ensuring spraying strength and the like during construction of a dry spraying method; and the problems of too fast solidification, pipe blockage and the like of an existing wet spraying method are also solved.
Description
Technical field
The present invention relates to a kind of concrete, be specifically related to a kind of foamed concrete and preparation method thereof, this concrete can be widely used in the supporting of colliery engineering wet shot.
Background technology
Dry shotcreting method occupies dominant position always in sinking and drifting, occupy absolute status especially in the China's coal-mine field especially.Operating efficiency is low, rebound degree is high, dust is big because dried spray technique exists, spray intensity can not get guaranteeing; Whitewashing can only be as the efflorescence prevention resist of rock stratum; Can not be as the problem of effective supporting means etc., in the last few years, along with the progress and the development of concrete spray technology; Wet spraying process has slowly occupied dominant position with its exclusive advantage; And become a kind of development trend, particularly the use range of sprayed concrete in underground works expanded in the development of wet-mix shotcrete technology greatly.Yet what still also adopted in the colliery of China at present is dried spray technique, and this just feasible wet-spray technique is applied to seems particularly important in the colliery.On the other hand, though wet-spray technique has bigger advantage than dried spray technique, it still also exists, and concrete is easy to solidify in batch can, pipeline, boning results in blockage, and cleans trouble, and equipment is drawback such as heaviness relatively.Therefore necessary existing wet spraying process is improved, make it better be colliery and underground works service.
Foamed concrete is that the foamed system through foaming machine fully foams whipping agent with mechanical system; And with foam and grout uniform mixing; Pumping system through foaming machine carries out cast-in-place construction or mould molding then, through the formed a kind of novel light lagging material that contains a large amount of sealed porositys of natural curing.It belongs to the air bubble-shaped thermal insulation material; It also has good flowability except the characteristics with lighting and heat insulatingization, be difficult for plugging when in pipeline, flowing; Therefore; Foamed concrete is used for the wet shot operation can solve that existing wet shotcreting is easy to solidify at batch can, pipeline, bond results in blockage, and clean and bother, equipment is drawback such as heaviness relatively.And can use industrial wastes such as flyash, slag, alumina laterite to do packing material in the foamed concrete in a large number.Meet national industrial policies, significant, have a extensive future.
The CN101497533 gelling material: patent discloses a kind of novel foam concrete main ingredient and has comprised: 100 parts of (by weight) cement; 10～30 parts in flyash; 5～20 parts of perlites; 30～60 parts in water; 0.5～2 part of water-resisting agent; 1～2.5 part of frostproofer; 0.8～1.2 part of water reducer; 2～5 parts of setting accelerator; 0.09～0.12 part of fiber; Whipping agent: the per-cent of volume (liter) by mass of cement (kilogram) is 100～170%.This foamed concrete has functions such as lightweight, waterproof, fire-resistant, insulation, freeze proof, cracking resistance and antidetonation concurrently, is particularly suitable for cold district engineering thermal insulation layer and underground works water blockoff and the use of antidetonation layer.Because this prescription is mainly used in the cast-in-place foamed concrete operation, need to guarantee that it has enough flowabilities, therefore can not be used for the sprayed concrete operation.
The CN101439950A patent discloses a kind of flexible coal powder foam concrete main ingredient and has comprised: (by weight percentage) cement, 10～15; Coal dust, 35～65; Medium coarse sand, 20～45; Water, 3～4.5; Water-resisting agent, 0.1～0.3; Whipping agent, 1～1.5.The structure impermeability is good; Stopping property that tool is good and integrity; Can be applicable to wall shutoff of the gas displacing coal-bed tunnel of gas and antiseepage in the colliery, available sprayed concrete mode, but do not see in this prescription have increase foamed concrete viscosity, plasticity and improve its dispersed and starting material; So viscosity and not enough with the injection uniformity coefficient, rebound degree also can not get guaranteeing.
Yet because the characteristics of foamed concrete itself and the restriction of present application industry; The general viscosity of existing foamed concrete prescription is very little; Can not adapt to colliery wet shot job requirements, therefore, necessaryly develop a kind of foamed concrete prescription that can be used for colliery wet shot supporting; The slurry that guarantees the ejection of wet shot machine firmly adheres to its surface, and not resilience basically.
Summary of the invention
The objective of the invention is to be to overcome above-mentioned deficiency and a kind of foamed concrete that is used for colliery wet shot supporting is provided; This foamed concrete is except having functions such as lightweight, fire-resistant, cracking resistance and anti-dynamic pressure; Also have good viscosity, be particularly suitable for colliery and sprayed concrete of substructure work supporting operation.
Another object of the present invention provides a kind of preparation method who is used for the foamed concrete of colliery wet shot supporting; The foamed concrete of producing through this preparation method has characteristics such as slurry is even, viscosity is enough, flowability is moderate; And can effectively control the presetting period, guarantee that product is reliable and stable.
To achieve these goals, the present invention takes to such an extent that technical scheme is:
A kind of foamed concrete that is used for colliery wet shot supporting comprises gelling material, water, extra material and whipping agent, and described gelling material is cement and flyash, and described extra material is glue, water reducer, accelerating chemicals, fiber and Mierocrystalline cellulose.
The above-mentioned foamed concrete that is used for colliery wet shot supporting, the weight part ratio of each raw material is: 200 parts of cement, 0～60 part in flyash, 60～150 parts in water; 20～50 parts in glue, 20～50 parts of water reducers, 60～120 parts of accelerating chemicalss; 80～120 parts of fibers, 80～140 parts of Mierocrystalline celluloses, 5～20 parts of whipping agents.
The above-mentioned foamed concrete that is used for colliery wet shot supporting, the weight part ratio of each raw material is preferably: 200 parts of cement, 10～50 parts in flyash; 80～130 parts in water, 30～50 parts in glue, 30～40 parts of water reducers; 80～100 parts of accelerating chemicalss; 90～110 parts of fibers, 100～120 parts of Mierocrystalline celluloses, 10～15 parts of whipping agents.
The above-mentioned foamed concrete that is used for colliery wet shot supporting, the weight part ratio of each raw material further is preferably: 200 parts of cement, 20～40 parts in flyash; 90～120 parts in water, 35～45 parts in glue, 33～37 parts of water reducers; 85～95 parts of accelerating chemicalss; 93～107 parts of fibers, 105～115 parts of Mierocrystalline celluloses, 12～14 parts of whipping agents.
Above-mentioned cement is the silicate cement of 42.5 grades of strength grades or 52.5 grades; Flyash is the first level flour coal ash; Glue is 107 glue; The preferred polycarboxylate water-reducer of water reducer; Accelerating chemicals is the efficient accelerating chemicals of HSA; Fiber optimization polypropylene monofilament durafiber; The preferred Vltra tears of Mierocrystalline cellulose; The preferred HT composite foamable agent of whipping agent.
The preparation method of the above-mentioned foamed concrete that is used for colliery wet shot supporting may further comprise the steps:
(1) raw-material pre-treatment: the lump in the rejecting gelling material etc. prevent its deposition in the foam slurry;
(2) weighing: according to each component of proportioning weighing;
(3) material loading and stirring: in stirrer, add cement, flyash, portion water (accounting for Total Water scope 70%～90%), glue, water reducer, fiber and the Mierocrystalline cellulose form slurry that stirs successively;
(4) foaming: (preferably with 50～70: 1 part by weight) mix, (for example: the HT-60 type foam cement machine of Henan China safe building materials ltd) processing diameter is the foam about 0.5-2mm through foamed concrete all-in-one equipment with whipping agent with surplus water;
(5) slurry and foams mix: the slurry that step (3) is obtained adds the foam of step (4) under whipped state, adds the foam continued and stirs when the slurry face can't see the buoyant foam, the completion of foamed concrete pulp preparation.
Durafiber has extremely strong cohesive force with the cement base-material.Can bond more and gather materials, bonding force more closely arranged, therefore can in concrete, bring into play more efficiently cracking resistance effect with cement matrix.Because durafiber can mix with concrete material rapidly and easily; Distribute extremely evenly, thoroughly; Nearly 20 fiber yarns in every cubic centimetre of grout, thus can constitute a kind of uniform unrest to support system in concrete (mortar) inside, thus produce a kind of effective secondary stiffening effect.
Vltra tears is the good thermoplastic material, has good film-forming properties, and institute's film forming is very tough and tensile, and glossiness is good, and elasticity is abundant, is used in and has played solid bubble effect in this prescription; In addition, Vltra tears has good cohesiveness, and is very stable, and good dispersivity, can work in coordination with viscosity and dispersiveness that 107 glue increase slurry; In addition, it is fiber that Vltra tears can also be taken as, the mixture of mortar and cement.
The present invention compared with prior art has the following advantages:
1, the general viscosity of existing foamed concrete prescription is very little; Can occur when being used in the colliery wet shot along the wall trickling; Can't adherent phenomenon; Can not adapt to colliery wet shot job requirements, it is a kind of except having functions such as lightweight, fire-resistant, cracking resistance and anti-dynamic pressure to utilize the present invention to produce, and also has good viscosity; Be particularly suitable for the foamed concrete of colliery and sprayed concrete of substructure work supporting operation, this prescription overcomes that the rebound degree that dry shotcreting method construction runs into is high, dust is big, spray intensity can not get shortcomings such as assurance; Also solve problems such as too fast that existing dampen shotcreting method exists solidifies, plugging.
2, in the scheme that is adopted; In order to increase the adhesive capacity of foamed concrete slurry; Adopted multiple measures such as in slurry, having added 107 glue, polypropylene monofilament durafiber, Vltra tears and accelerating chemicals; Guaranteed that successfully prepared foamed concrete had both had enough flowabilities, also can satisfy the viscosity requirement.
3, because foamed concrete intensity can be through adding the foam volume flexible; Can spray different supporting intensities to the different surrounding rock condition like this, compare, can save starting material greatly with existing wet spraying process; Especially cement consumption, thus cost saved to a great extent.Test-results shows (like Fig. 1): spray foam concrete density is 700kg/m
3The time, the cement of 1 cube of foamed concrete and flyash consumption are merely 500kg and 100kg, and ultimate compression strength has reached 6.5MPa, and stopping property and homogeneity are all fine.
Relation between Fig. 1 density of material and gelling material and the ultimate compression strength
Embodiment
Embodiment of the invention starting material are selected: what cement was selected for use is 42.5 grades of ordinary Portland cements that the new cement of city's sales to China ltd produces, and its performance preparation meets GB175-1999 silicate cement, ordinary Portland cement " regulation; Flyash is selected for use is the first level flour coal ash that commercially available Wuhan Luo Yang power plant produces, and its performance index meet GB/T1596-2005 and are used for cement and concrete flyash " stipulate; What glue was selected for use is commercially available 701 glue; Water reducer is selected for use is the PC100 polycarboxylate high performance dehydragent that commercially available Wuhan Su Bo building material company produces; Accelerating chemicals is selected the efficient accelerating chemicals of HSA of commercially available China Building Material Scientific Research General Institute development for use; What fiber was selected for use is U.S.'s durafiber that Wuhan City permanent rule commerce and trade ltd sells; What Mierocrystalline cellulose was selected for use is the Vltra tears that Wuhan City Longxin chemical industry trade Co., Ltd sells; What foaming agent was selected for use is the HT composite foamable agent of commercially available Henan Huatai Building Materials Development Co., Ltd. exploitation.
Further specify below in conjunction with embodiment:
Embodiment 1
A kind of foamed concrete that is used for colliery wet shot supporting, it is made up of following weight percent raw material:
Parts by weight of raw materials
(1) gelling material:
200 parts of cement
30 parts in flyash
(2) water is 110 parts
(3) extra material:
40 parts in glue
35 parts of water reducers
90 parts of accelerating chemicalss
95 parts of fibers
110 parts of Mierocrystalline celluloses
(4) whipping agent is 13 parts.
The preparation method of above-mentioned foamed concrete:
1, raw-material pre-treatment, the lump in the rejecting gelling material etc. prevent its deposition in the foam slurry;
2, dosage: according to each component of proportioning weighing;
3, material loading and stirring: in stirrer, add cement, flyash, portion water, glue, water reducer, fiber and Mierocrystalline cellulose successively and stir;
4, foaming: foaming when slurry stirs, with surplus water and whipping agent with 50～70: 1 mixed, processing diameter through special foaming all-in-one equipment is the foam about 1mm;
5, slurry and foams mix: after the gelling slurry prepares, do not shut down, under whipped state, add foam; Add the foam continued and stirred 3～5 minutes, when the slurry face can't see the buoyant foam, the foamed concrete pulp preparation was accomplished.
Embodiment 2
Prescription is seen table 1, and the preparation method is led to embodiment 1.
Embodiment 3
Prescription is seen table 1, and the preparation method is led to embodiment 1.
Embodiment 4
Prescription is seen table 1, and the preparation method is led to embodiment 1.
Embodiment 5
Prescription is seen table 1, and the preparation method is led to embodiment 1.
Embodiment 6
Prescription is seen table 1, and the preparation method is led to embodiment 1.
Embodiment 7
Prescription is seen table 1, and the preparation method is led to embodiment 1.
Embodiment 8
Prescription is seen table 1, and the preparation method is led to embodiment 1.
Embodiment 9
Prescription is seen table 1, and the preparation method is led to embodiment 1.
Embodiment 10
Prescription is seen table 1, and the preparation method is led to embodiment 1.
Table 1
Claims (9)
1. a foamed concrete that is used for colliery wet shot supporting comprises gelling material, water, extra material and whipping agent, it is characterized in that, described gelling material is cement and flyash, and described extra material is glue, water reducer, accelerating chemicals, fiber and Mierocrystalline cellulose.
2. the foamed concrete that is used for colliery wet shot supporting according to claim 1 is characterized in that, the weight part ratio of each raw material is: 200 parts of cement; 0～60 part in flyash, 60～150 parts in water, 20～50 parts in glue; 20～50 parts of water reducers, 60～120 parts of accelerating chemicalss, 80～120 parts of fibers; 80～140 parts of Mierocrystalline celluloses, 5～20 parts of whipping agents.
3. the foamed concrete that is used for colliery wet shot supporting according to claim 2 is characterized in that, the weight part ratio of each raw material is: 200 parts of cement; 10～50 parts in flyash, 80～130 parts in water, 30～50 parts in glue; 30～40 parts of water reducers, 80～100 parts of accelerating chemicalss, 90～110 parts of fibers; 100～120 parts of Mierocrystalline celluloses, 10～15 parts of whipping agents.
4. the foamed concrete that is used for colliery wet shot supporting according to claim 3 is characterized in that, the weight part ratio of each raw material is: 200 parts of cement; 20～40 parts in flyash, 90～120 parts in water, 35～45 parts in glue; 33～37 parts of water reducers, 85～95 parts of accelerating chemicalss, 93～107 parts of fibers; 105～115 parts of Mierocrystalline celluloses, 12～14 parts of whipping agents.
5. according to each described foamed concrete that is used for colliery wet shot supporting of claim 1-4, it is characterized in that described water reducer is a polycarboxylate water-reducer.
6. according to each described foamed concrete that is used for colliery wet shot supporting of claim 1-4, it is characterized in that described accelerating chemicals is the efficient accelerating chemicals of HSA.
7. according to each described foamed concrete that is used for colliery wet shot supporting of claim 1-4, it is characterized in that described fiber is the polypropylene monofilament durafiber.
8. according to each described foamed concrete that is used for colliery wet shot supporting of claim 1-4, it is characterized in that described Mierocrystalline cellulose is a Vltra tears.
9. each described preparation method who is used for the foamed concrete of colliery wet shot supporting of claim 1-4 is characterized in that, may further comprise the steps:
(1) raw-material pre-treatment;
(2) weighing: according to each component of proportioning weighing;
(3) material loading and stirring: in stirrer, add cement, flyash, portion water, glue, water reducer, accelerating chemicals, fiber and the Mierocrystalline cellulose form slurry that stirs successively;
(4) foaming: surplus water is mixed with whipping agent, process the foam that diameter is 0.5-2mm through foamed concrete all-in-one equipment;
(5) slurry and foams mix: the slurry that step (3) is obtained adds the foam of step (4) under whipped state, adds the foam continued and stirs when the slurry face can't see the buoyant foam, the completion of foamed concrete pulp preparation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201110295259 CN102503524B (en) | 2011-09-30 | 2011-09-30 | Foam concrete for wet-spraying support of coal mine and preparation method thereof |
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| CN 201110295259 CN102503524B (en) | 2011-09-30 | 2011-09-30 | Foam concrete for wet-spraying support of coal mine and preparation method thereof |
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| CN102503524B CN102503524B (en) | 2013-06-05 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103771817A (en) * | 2012-10-24 | 2014-05-07 | 同济大学 | Desulfurized gypsum foam concrete and preparation method thereof |
| CN105019326A (en) * | 2015-06-29 | 2015-11-04 | 河南华泰建材开发有限公司 | Roadbed structure applied to road widening and construction method |
| CN105016768A (en) * | 2015-06-29 | 2015-11-04 | 河南华泰建材开发有限公司 | Lightweight foam soil applied in subway station top board backfilling, and production method thereof |
| CN105036790A (en) * | 2015-06-29 | 2015-11-11 | 河南华泰建材开发有限公司 | Lightweight foam soil for changing and filling special metro subgrade |
| CN108191347A (en) * | 2018-03-01 | 2018-06-22 | 山东工商学院 | It is a kind of for concrete of coal mining supporting and preparation method thereof |
| CN114292075A (en) * | 2022-03-02 | 2022-04-08 | 徐州意创化工科技有限公司 | Micro-foaming inorganic spraying material and underground coal mine spraying method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1204670A (en) * | 1997-07-04 | 1999-01-13 | 曹岩 | Coating capable of waterproof, seepage control and leakproof |
| CN1559965A (en) * | 2004-02-26 | 2005-01-05 | 同济大学 | Non-chlorine type high perpormance conrete accelerating agent |
| EP1657226A1 (en) * | 2003-08-20 | 2006-05-17 | Denki Kagaku Kogyo Kabushiki Kaisha | Spraying material and spray technique employing the same |
| US20060281836A1 (en) * | 2005-06-14 | 2006-12-14 | Construction Research & Technology Gmbh | Providing freezing and thawing resistance to cementitious compositions |
-
2011
- 2011-09-30 CN CN 201110295259 patent/CN102503524B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1204670A (en) * | 1997-07-04 | 1999-01-13 | 曹岩 | Coating capable of waterproof, seepage control and leakproof |
| EP1657226A1 (en) * | 2003-08-20 | 2006-05-17 | Denki Kagaku Kogyo Kabushiki Kaisha | Spraying material and spray technique employing the same |
| CN1559965A (en) * | 2004-02-26 | 2005-01-05 | 同济大学 | Non-chlorine type high perpormance conrete accelerating agent |
| US20060281836A1 (en) * | 2005-06-14 | 2006-12-14 | Construction Research & Technology Gmbh | Providing freezing and thawing resistance to cementitious compositions |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103771817A (en) * | 2012-10-24 | 2014-05-07 | 同济大学 | Desulfurized gypsum foam concrete and preparation method thereof |
| CN105019326A (en) * | 2015-06-29 | 2015-11-04 | 河南华泰建材开发有限公司 | Roadbed structure applied to road widening and construction method |
| CN105016768A (en) * | 2015-06-29 | 2015-11-04 | 河南华泰建材开发有限公司 | Lightweight foam soil applied in subway station top board backfilling, and production method thereof |
| CN105036790A (en) * | 2015-06-29 | 2015-11-11 | 河南华泰建材开发有限公司 | Lightweight foam soil for changing and filling special metro subgrade |
| CN108191347A (en) * | 2018-03-01 | 2018-06-22 | 山东工商学院 | It is a kind of for concrete of coal mining supporting and preparation method thereof |
| CN114292075A (en) * | 2022-03-02 | 2022-04-08 | 徐州意创化工科技有限公司 | Micro-foaming inorganic spraying material and underground coal mine spraying method |
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