CN1900002A - Low resilient rate high strength spray concrete additive - Google Patents

Low resilient rate high strength spray concrete additive Download PDF

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Publication number
CN1900002A
CN1900002A CNA2006100455318A CN200610045531A CN1900002A CN 1900002 A CN1900002 A CN 1900002A CN A2006100455318 A CNA2006100455318 A CN A2006100455318A CN 200610045531 A CN200610045531 A CN 200610045531A CN 1900002 A CN1900002 A CN 1900002A
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Prior art keywords
high strength
rate high
weight parts
spray concrete
low resilient
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CNA2006100455318A
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CN100402456C (en
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谭允祯
王庆昭
郎加平
顾士彬
徐方举
赵文彬
赵修海
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    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039Premixtures of ingredients
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2111/00Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/00034Physico-chemical characteristics of the mixtures
    • C04B2111/00146Sprayable or pumpable mixtures
    • C04B2111/00155Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite
    • C04B2111/00163Sprayable, i.e. concrete-like, materials able to be shaped by spraying instead of by casting, e.g. gunite by the dry process

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The admixture for low resilience and high strength sprayed concrete consists of active montmorillonite clay 30-240 weight portions, quick setting agent 30-70weight portions, and acrylic copolymer 0.8-12weight portions. The admixture is used mainly for dry sprayed concrete, and has the advantages of lower dust density, low resilience, high long-term strength, etc.

Description

A kind of low resilient rate high strength spray concrete additive
Technical field
The present invention relates to a kind of concrete spraying additive.
Background technology
Sprayed concrete is by spraying machinery, utilize pressurized air or other power, will be by the mixed materials such as cement, sand, stone and admixture of certain proportioning, be ejected into by jet pipe and be subjected on the spray plane, setting and harden within very short several minutes and the concrete reinforcement reinforcement material of moulding.
At present, dry shotcreting method is mainly adopted in the construction of domestic sprayed concrete, after just cement, sand, stone and accelerating chemicals being mixed into dried mixed material by a certain percentage, stir with stirrer, put into again in the dry spraying machine and arrive shower nozzle with compressed air delivery, after the shower nozzle place adds the entry mixing, be ejected into and be subjected on the spray plane with certain pressure, distance.The dry shotcreting method face dust concentration is big, the rebound degree height, and also the ultimate compression strength of spray-up working face weakens.Spray working face and have good intensity for making, and the operating environment dust concentration is low, rebound degree is low, mixed material need add admixture.China Coal Research Institute Beijing shaft building institute has developed a kind of sprayed concrete in nineteen ninety and has subtracted bullet with dirt speed coagulating agent, by being added with the water-soluble polymerss such as carboxymethyl cellulose ester, polyethylene glycol and polyacrylamide of thickening power, reached and subtracted bullet, depositing dust purpose, and add organic surface active agent satisfy shortly coagulate, requirements such as depositing dust, raising late strength of concrete, volume is the 3.5%-5% of cement weight.Ejection test shows that 28 days ultimate compression strength of sprayed concrete is 20Mpa than common admixture rebound degree decline 40%-60%, but fails to overcome the deficiency that late strength of concrete reduces.
Summary of the invention
Technical problem to be solved by this invention provides a kind of low resilient rate high strength spray concrete additive, and it has characteristics such as rebound degree is low, dust concentration is low in use, and can improve the sprayed concrete intensity in each length of time.
The technical solution adopted for the present invention to solve the technical problems is: a kind of low resilient rate high strength spray concrete additive, its material proportion is: activated montmorillonite clay 30-240 weight part, accelerating chemicals 30-70 weight part, acrylic copolymer 0.8-12 weight part.
The content of activated montmorillonite clay also can be the 35-220 weight part in the above-mentioned admixture.
The content of accelerating chemicals also can be the 35-65 weight part in the above-mentioned admixture.
The content of acrylic copolymer also can be the 0.9-11 weight part in the above-mentioned admixture.
The content of activated montmorillonite clay also can be the 40-200 weight part in the above-mentioned admixture.
The content of accelerating chemicals also can be the 40-60 weight part in the above-mentioned admixture.
The content of acrylic copolymer also can be the 1-10 weight part in the above-mentioned admixture.
The main component of above-mentioned accelerating chemicals is an aluminum oxide clinker.
The aforesaid propylene acid copolymer is by methacrylic acid and the vinylformic acid water-soluble polymer solution in the aqueous phase copolymerization.
Activated montmorillonite clay is meant the polynite of adopting organic acid for activating among the present invention.Polynite claims montmorillonite again, is a kind of lamellar aluminosilicate.Polynite is not a pure substance, does not have fixed chemical constitution and chemical formula, is the clay pit of main component with numerous mineral associations with the polynite normally.The general structural formula of montmorillonite is Mx{ (Al4-xMgx) 4[Si8020] (OH) 4}nH2O (M represents positively charged ions such as K+, Na+, Ca2+).The preparation method of activated montmorillonite clay is, the natural montmorillonite raw ore is dried, be crushed to then about 600 orders, in stirrer, use 0%-5% (organic acid/polynite, m/m) aqueous solutions of organic acids soaks into, polynite is mixed with aqueous solutions of organic acids, and normal temperature stirred 20-40 minute down, promptly obtained activated montmorillonite clay.Organic acid can adopt a kind of in furoate clothing, Succinic Acid and the citric acid, aqueous solutions of organic acids concentration be 10%-20% (organic acid/water, m/m).Polynite shows very big cohesiveness when mixing with water.There is abundant silicon hydroxyl on the surface of polynite, and hydroxyl and water form hydrogen bond, and the organism of trace is had adsorption and multiple poly-attached form forms micella, is assembling, and flocculation produces close-burning during gel.Polynite is as tackifier, in course of injection, can improve between the cement granules, between the cement and aggregate and spray thing and the bonding strength that is subjected between the spray plane, thus reduction dust concentration and rebound degree.
Accelerating chemicals employing aluminum oxide clinker is a major ingredient among the present invention, adds calcining and grinding such as soda ash or heavy alkali, Wingdale, gypsum and forming.
The preparation method of acrylic copolymer is that methacrylic acid and vinylformic acid is soluble in water in 1: 1 ratio among the present invention, monomer concentration is about 5% (methacrylic acid+vinylformic acid/water, m/m), add redox initiator such as Potassium Persulphate, ammonium persulphate etc. then, about 2 hours, the control soltion viscosity is at 0.5-5Pa.s in polymerization under 40-80 ℃ the temperature.
Concrete spraying additive of the present invention is mainly used in the dried pressure spray process of sprayed concrete, has that dust concentration is low, rebound degree is low, the later strength advantages of higher.
Embodiment
Get the polynite raw ore of 50 weight parts, in baking oven,, be crushed to 600 orders then, obtain the polynite powder in 150 ℃ of oven dry; The furoate clothing of getting 1 weight part is dissolved in the water of 7.5 weight parts, obtains the furoate clothing aqueous solution; The polynite powder is put into homogenizer, add the furoate clothing aqueous solution then, high-speed stirring obtains activated montmorillonite clay.
Get 5% methacrylic aqueous acid of 25 weight parts and 5% acrylic acid aqueous solution of 25 weight parts and put into container, stir, heating in water bath to 40 ℃, the potassium persulfate solution of Dropwise 5 0/3 weight part be as initiator, reaction half an hour; The Potassium Persulphate of Dropwise 5 0/3 weight part reacted 1 hour again, and system is thickness gradually, and temperature raises; At last, the Potassium Persulphate of Dropwise 5 0/3 weight part continues to stir, reacted 1 hour again, obtains the acrylic acid copolymer soln that viscosity is about 1Pa.s.
It is major ingredient that accelerating chemicals adopts aluminum oxide clinker, adds calcining and grinding such as soda ash or heavy alkali, Wingdale, gypsum and forms.
Embodiment 1: get activated montmorillonite clay 30 weight parts, accelerating chemicals 30 weight parts, acrylic copolymer 0.8 weight part and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 2: get activated montmorillonite clay 40 weight parts, accelerating chemicals 35 weight parts, acrylic copolymer 0.9 weight part and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 3: get activated montmorillonite clay 60 weight parts, accelerating chemicals 40 weight parts, acrylic copolymer 1.0 weight parts and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 4: get activated montmorillonite clay 80 weight parts, accelerating chemicals 43 weight parts, acrylic copolymer 2.0 weight parts and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 5: get activated montmorillonite clay 100 weight parts, accelerating chemicals 48 weight parts, acrylic copolymer 3.0 weight parts and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 6: get activated montmorillonite clay 110 weight parts, accelerating chemicals 50 weight parts, acrylic copolymer 4.8 weight parts and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 7: get activated montmorillonite clay 120 weight parts, accelerating chemicals 52 weight parts, acrylic copolymer 5.0 weight parts and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 8: get activated montmorillonite clay 130 weight parts, accelerating chemicals 55 weight parts, acrylic copolymer 5.6 weight parts and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 9: get activated montmorillonite clay 150 weight parts, accelerating chemicals 58 weight parts, acrylic copolymer 6.0 weight parts and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 10: get activated montmorillonite clay 160 weight parts, accelerating chemicals 60 weight parts, acrylic copolymer 6.4 weight parts and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 11: get activated montmorillonite clay 180 weight parts, accelerating chemicals 62 weight parts, acrylic copolymer 7.0 weight parts and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 12: get activated montmorillonite clay 200 weight parts, accelerating chemicals 64 weight parts, acrylic copolymer 8.0 weight parts and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 13: get activated montmorillonite clay 220 weight parts, accelerating chemicals 66 weight parts, acrylic copolymer 9.0 weight parts and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 14: get activated montmorillonite clay 240 weight parts, accelerating chemicals 70 weight parts, acrylic copolymer 10.0 weight parts and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 15: get activated montmorillonite clay 240 weight parts, accelerating chemicals 70 weight parts, acrylic copolymer 11.0 weight parts and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 16: get activated montmorillonite clay 240 weight parts, accelerating chemicals 70 weight parts, acrylic copolymer 12.0 weight parts and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 17: get activated montmorillonite clay 30 weight parts, accelerating chemicals 70 weight parts, acrylic copolymer 0.8 weight part and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 18: get activated montmorillonite clay 240 weight parts, accelerating chemicals 30 weight parts, acrylic copolymer 12.0 weight parts and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 19: get activated montmorillonite clay 240 weight parts, accelerating chemicals 70 weight parts, acrylic copolymer 12.0 weight parts and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 20: get activated montmorillonite clay 240 weight parts, accelerating chemicals 30 weight parts, acrylic copolymer 0.8 weight part and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Embodiment 21: get activated montmorillonite clay 30 weight parts, accelerating chemicals 70 weight parts, acrylic copolymer 0.8 weight part and put into mixer and stir, promptly get low resilient rate high strength spray concrete additive of the present invention.
Admixture of the present invention consumption in use be 4.05-13.5% (admixture/cement, m/m).
For beneficial effect of the present invention more clearly is described, the admixture with present widespread usage under coal mine has carried out simultaneous test, and simultaneous test is to carry out in different collieries, and construction technology has difference, test-results such as following table 1, table 2, table 3.
Detection method is described as follows:
1, dust concentration adopts the dust instrument to detect, and presses GBJ-85 and carries out.
2, rebound degree rebound degree=land inventory/injection total amount * 100%, resilience material adopt woven cloth to collect and weigh then, spray total amount and calculate with the weight that once adds materials.
3, ultimate compression strength
4, time of coagulation
Below in the test, A is an activated montmorillonite clay, and B is an accelerating chemicals, and C is an acrylic copolymer.
Table 1 dry shotcreting method simultaneous test one result
Admixture Rebound degree (%) Dust concentration (mg/cm 3) Concrete crushing strength (Mpa)
Kind Volume (with the weight percent of cement) Rebound degree Reduced rate Total dirt Respirable dust Total dirt inhibiting rate (%) 1 day 3 days 7 days 28 days
J85 6 14.8 20.5 12.5 20.8 28.4 22.6
8 12.7 7.4 18.6 9.3 9.6 18.7 20.4 17.5
Admixture of the present invention A3;B3;C0.1 8.4 43.2 13.7 33.2 21.3 44.5 53.2 40.6
A3;B3;C0.2 7.8 47.3 10.8 47.3 22.6 46.1 55.8 43.9
Proportioning raw materials 325R cement: sand: stone=1: 1.8: 2.2; Shotcrete machine model PZ-5 (b)
Table 2 dry shotcreting method simultaneous test two results
Admixture Rebound degree (%) Dust concentration (mg/cm 3) Concrete crushing strength (Mpa)
Kind Volume (with the weight percent of cement) Rebound degree Reduced rate Total dirt Respirable dust Total dirt inhibiting rate (%) 1 day 3 days 7 days 28 days
J85 6 27.6 95.2 10.2 12.5 20.8 28.4 22.6
Admixture of the present invention A5;B3;C0.1 18.9 31.5 65.9 6.9 30.7 21.3 44.5 53.2 40.6
A10;B3;C0.1 16.5 40.2 54.5 6.1 42.7 13.9 27.9 40.6 36.3
Proportioning raw materials 425R cement: sand: stone=1: 1.56: 1.56; The vast spark PLCI-200 of shotcrete machine model
Table 3 dry shotcreting method simultaneous test three results
Admixture Rebound degree (%) Dust concentration (mg/cm 3) Concrete crushing strength (Mpa)
Kind Volume (with the weight percent of cement) Rebound degree Reduced rate Total dirt Respirable dust Total dirt inhibiting rate (%) 1 day 3 days 7 days 28 days
J85 6 14.8 20.5 12.5 20.8 28.4 22.6
8 12.7 7.4 18.6 9.3 9.6 18.7 20.4 17.5
Admixture of the present invention A2;B2;C0.05 9.6 35.1 14.7 28.3 20.5 42.5 54.3 42.6
A10;B3;C0.5 6.9 53.4 8.2 60.0 23.4 45.2 53.6 41.8
Proportioning raw materials 325R cement: sand: stone=1: 1.8: 2.2; Shotcrete machine model PZ-5 (b).

Claims (9)

1, a kind of low resilient rate high strength spray concrete additive is characterized in that its material proportion is: activated montmorillonite clay 30-240 weight part, accelerating chemicals 30-70 weight part, acrylic copolymer 0.8-12 weight part.
2, low resilient rate high strength spray concrete additive according to claim 1 is characterized in that the content of described activated montmorillonite clay also can be the 35-220 weight part.
3, low resilient rate high strength spray concrete additive according to claim 1 is characterized in that the content of described accelerating chemicals also can be the 35-65 weight part.
4, low resilient rate high strength spray concrete additive according to claim 1 is characterized in that the content of described acrylic copolymer also can be the 0.9-11 weight part.
5, low resilient rate high strength spray concrete additive according to claim 1 and 2 is characterized in that the content of described activated montmorillonite clay also can be the 40-200 weight part.
6,, it is characterized in that the content of described accelerating chemicals also can be the 40-60 weight part according to claim 1 or 3 described low resilient rate high strength spray concrete additives.
7,, it is characterized in that the content of described acrylic copolymer also can be the 1-10 weight part according to claim 1 or 4 described low resilient rate high strength spray concrete additives.
8, low resilient rate high strength spray concrete additive according to claim 1, the main component that it is characterized in that described accelerating chemicals is an aluminum oxide clinker.
9, low resilient rate high strength spray concrete additive according to claim 1 is characterized in that described acrylic copolymer is by methacrylic acid and the vinylformic acid water-soluble polymer solution in the aqueous phase copolymerization.
CNB2006100455318A 2006-07-20 2006-07-20 Low resilient rate high strength spray concrete additive Expired - Fee Related CN100402456C (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102584089A (en) * 2012-03-05 2012-07-18 河南理工大学 Formula for enhanced accelerating agent
CN103011650A (en) * 2011-09-27 2013-04-03 焦作市新筑王材料科技有限公司 Improved manufacture method of cement accelerator
CN103058565A (en) * 2013-01-07 2013-04-24 山东科技大学 Enhanced and low-rebound liquid setting accelerator used in wet spraying process
CN104003642A (en) * 2014-06-12 2014-08-27 赵月 Concrete admixture and application thereof
CN105198321A (en) * 2015-10-22 2015-12-30 刘创 Concrete and preparation method thereof
CN109608137A (en) * 2019-01-07 2019-04-12 山东科技大学 A kind of thin layer rock reinforcing material

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1109032A (en) * 1994-10-24 1995-09-27 王芳 Additives for jetting concrete

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103011650A (en) * 2011-09-27 2013-04-03 焦作市新筑王材料科技有限公司 Improved manufacture method of cement accelerator
CN102584089A (en) * 2012-03-05 2012-07-18 河南理工大学 Formula for enhanced accelerating agent
CN103058565A (en) * 2013-01-07 2013-04-24 山东科技大学 Enhanced and low-rebound liquid setting accelerator used in wet spraying process
CN104003642A (en) * 2014-06-12 2014-08-27 赵月 Concrete admixture and application thereof
CN104003642B (en) * 2014-06-12 2016-01-27 广东湘盈建筑工程有限公司 A kind of concrete admixture and application thereof
CN105198321A (en) * 2015-10-22 2015-12-30 刘创 Concrete and preparation method thereof
CN109608137A (en) * 2019-01-07 2019-04-12 山东科技大学 A kind of thin layer rock reinforcing material

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