CN101186461A - Composite liquid for increasing early strength of concrete mixed with polycarboxylate additive - Google Patents

Composite liquid for increasing early strength of concrete mixed with polycarboxylate additive Download PDF

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Publication number
CN101186461A
CN101186461A CNA2007101902953A CN200710190295A CN101186461A CN 101186461 A CN101186461 A CN 101186461A CN A2007101902953 A CNA2007101902953 A CN A2007101902953A CN 200710190295 A CN200710190295 A CN 200710190295A CN 101186461 A CN101186461 A CN 101186461A
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Prior art keywords
concrete
strength
polycarboxylate
water
percent
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CNA2007101902953A
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Inventor
刘加平
冉千平
缪昌文
沙建芳
毛永琳
洪锦祥
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Jiangsu Bote New Materials Co Ltd
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Jiangsu Bote New Materials Co Ltd
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Priority to CNA2007101902953A priority Critical patent/CN101186461A/en
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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
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/0028—Aspects relating to the mixing step of the mortar preparation
    • C04B40/0039—Premixtures of ingredients
    • C04B40/0046—Premixtures of ingredients characterised by their processing, e.g. sequence of mixing the ingredients when preparing the premixtures
    • 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
    • C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
    • C04B2111/20—Resistance against chemical, physical or biological attack
    • C04B2111/28—Fire resistance, i.e. materials resistant to accidental fires or high temperatures
    • 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
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

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

Abstract

The invention relates to a compound liquid for improving the early strength of the concrete mixed with polycarboxylate additive and a preparation method thereof. The compound liquid is prepared with the following components in weight proportion: 25-40percent of water soluble sulphate, 3-6 percent of organic alkoxyl amine and the rest is water. The preparation method is: 1) water is put into a reaction vessel and heated to 40DEG C- 60DEG C, and organic alkoxyl amine is added and well stirred; 2) water soluble sulphate is added and stirred to form a homogenous solution. The preparing process of the invention is simple and easy to apply; the invention does not corrode steel, and does not affect the condensation of concrete and reduce the later strength of concrete. The addition of the compound liquid is 0.5-1.5 percent of cementing material content and can improve the compressive strength of the concrete by 30-60 percent in 16h, by 25-40percent in 1d and by 15-25 percent in 3d, and the compressive strength of the concrete does not fall in 28d, which greatly shortens maintenance period, expedites construction progress, advances turnover rate of template, shortens construction period and lowers cost.

Description

The complex liquid and preparation method thereof of the early age strength of concrete of polycarboxylate admixture is mixed in a kind of raising
Technical field
The present invention relates to a kind of method that improves concrete strength, be specifically related to the method that the early age strength of concrete of polycarboxylate admixture is mixed in a kind of raising, belong to technical field of concrete additives.
Background technology
Condensation polymer type admixtures such as the polycarboxylate admixture with traditional naphthalene is, trimeric cyanamide compare because have that volume is low, advantages such as degree of freedom is big have become global research focus and development priority on the good dispersity, molecular structure, are called as third generation superplasticizer.It is reported, Japan's polycarboxylate admixture has accounted for more than 80% of all high-performance additive product sums, domestic because the rise of large foundation facilities such as nuclear power, water conservancy, bridge, tunnel, especially state-owned railroads Line for Passenger Transportation net engineering programming is implemented, to the market requirement sustainable growth of high-performance admixture.The polycarboxylate admixture has delayed the aquation of cement to a certain extent in the market, when particularly early stage temperature is low, because the early strength slower development has limited its use under cold climate.Even if under normal temperature condition, concrete 1d ultimate compression strength also only can reach 20～30% of design strength, and 3d ultimate compression strength reaches about 40% of design strength.The concrete durability problem more and more causes building engineer's attention in addition, a large amount of mineral admixtures are applied to and improve the anti-environmental attack problem of concrete in the concrete, yet most of mineral admixture all significantly reduces concrete early stage mechanical property, and this has also had influence on its application widely at building materials field.
The building engineer is in order to improve early age strength of concrete, accelerate the template turnover, improve construction speed, have to adopt the method that reduces water-cement ratio, improves cement mark or cement consumption, and the technological approaches of interpolation hardening accelerator improves concrete early strength as far as possible.Chloride salt hardening accelerator is the inorganic salts hardening accelerator of using the earliest, can improve concrete early strength, but has a strong impact on concrete later strength, and because it contains Cl -, easily cause the removing blunt of reinforcing steel bar corrosion, and be limited to use.Sulfates hardening accelerator causes the later stage degradation easily, and concrete surface is easily separated out " bloom ", influences outward appearance, and has improved the alkali content in the concrete, can quicken alkali-aggregate reaction.Though alcamines hardening accelerator is little and do not have chlorion, its addition content to be difficult to control to concrete later stage performance impact, cause serious slow setting of concrete and concrete strength to descend easily, and its fancy price has influenced its application in the concrete industry.U.S. Pat 4444593 has been announced compound hardening accelerator or the yellow soda ash of Japanese Patent JP6005050 announcement and the composition of Tai-Ace S 150 of yellow soda ash and ferric sulfate in addition, its common feature is: after they are mixed concrete, when improving early strength (in 1 day) intensity, promptly reduced by 28 days intensity, thereby make impervious decline, be unfavorable for the raising of weather resistance.European patent EP 1547986A1 has announced a kind of early-strength type polycarboxylate admixture, but complicated process of preparation, and can not solve the problem of early strength slower development under cold condition of commercial polycarboxylate dehydragent in the market.
In sum, it is unsafty adopting traditional inorganic salt or organic alcohol amine class hardening accelerator to improve early age strength of concrete, and its volume height has reduced late strength of concrete.And potent fruit morning of polycarboxylate admixture in the market also can not be entirely satisfactory, especially the strength development slower development under the low temperature environment.And adopt on traditional inorganic salt or organic hardening accelerator and the market polycarboxylate admixture to carry out layering not only easily taking place when composite, the package stability variation, and can reduce the dispersing property of polycarboxylate admixture.
Summary of the invention
Research purpose of the present invention is that development does not have described those shortcomings of background technology, is mainly used in and the compound use of polycarboxylate admixture in the market, improves the concrete early strength of mixing the polycarboxylate admixture.
The applicant finds after deliberation: small amounts of water soluble vitriol has been accelerated the early hydration of cement, helps the raising of early age strength of concrete, and can reduce cost.
The applicant also finds after deliberation: adopt the adding of water-soluble organic alkoxy amine not only can improve early age strength of concrete, and can improve the solubleness of vitriol and the stability of solution.
Based on above-mentioned research, raising of the present invention is mixed the complex liquid of the early age strength of concrete of polycarboxylate admixture and is made up of water soluble sulfate, organic alkoxy amine, water, and its weight percent is as follows:
Water soluble sulfate 25-40%
Organic alkoxy amine 3-6%
Water 57-69%
Water soluble sulfate of the present invention refers to Tai-Ace S 150, sal epsom, ferric sulfate or they mixture with arbitrary proportion.
Organic alkoxy amine of the present invention is represented by general formula (1) or general formula (2).
Figure S2007101902953D00021
R 1, R 2, R 3Independently represent H or hydroxyethyl or hydroxypropyl respectively, but R 1, R 2, R 3Can not all be H simultaneously.
Figure S2007101902953D00022
R 4, R 5, R 6, R 7Respectively independent represent H or Or
Figure S2007101902953D00024
Y=1 or 2, but R 4, R 5, R 6, R 7Can not all be H simultaneously.
Within the scope of the present invention, the typical example of alkoxyl group organic amine is thanomin, diethanolamine, trolamine, Yi Bingchunan, diisopropanolamine (DIPA), tri-isopropanolamine, dihydroxy ethyl quadrol, dihydroxypropyl quadrol, tetrahydroxyethyl-ethylene diamine, tetrahydroxypropyl ethylenediamine.These alkoxyl group organic amines can use separately also and can be used by the form of mixtures of two or more composition.
The preparation method of complex liquid of the early age strength of concrete of polycarboxylate admixture is mixed in above-mentioned raising, may further comprise the steps:
1, in reactor, adds an amount of water, be warming up to 40 ℃～60 ℃, drop into the alkoxyl group organic amine of metering, stir.
2, in the reactor that alkoxyl group organic amine solution is housed, drop into the vitriol that measures, stir into uniform solution.
It is the early age strength of concrete of the polycarboxylate admixture of major ingredient (general formula 3) that the present invention is suitable for improving the graft copolymer of mixing with acrylic or methacrylic acid and polyethers.
Figure S2007101902953D00031
R wherein 8Be CH 3Or H, R 9Be the alkyl of H or 1-4 carbon atom, M is hydrogen, monovalent metallic ion, divalent-metal ion, ammonium or organic amino group.A, b are the chain number of multipolymer repeating unit, and its size is made up of and the control of molecular weight size multipolymer.EO is an ethylene oxide, and n is an oxyethane addition mole mean number.
It is the early age strength of concrete of the polycarboxylate admixture of major ingredient that the present invention is suitable for improving the graft copolymer of mixing with vinylbenzene and maleic anhydride and polyethers (general formula 4).
R wherein 9Be the alkyl of H or 1-4 carbon atom, M is H, monovalent metallic ion, divalent-metal ion, ammonium or organic amino group.A, b are the chain number of multipolymer repeating unit, and its size is made up of and the control of molecular weight size multipolymer.EO is an ethylene oxide, and n is an oxyethane addition mole mean number.
It is the early age strength of concrete of the polycarboxylate admixture of major ingredient (general formula 5) that the present invention is suitable for improving the graft copolymer of mixing with maleic anhydride and allyl alcohol ether and polyethers.
R wherein 9Be the alkyl of H or 1-4 carbon atom, M is H, monovalent metallic ion, divalent-metal ion, ammonium or organic amino group.A, b are the chain number of multipolymer repeating unit, and its size is made up of and the control of molecular weight size multipolymer.EO is an ethylene oxide, and n, m are oxyethane addition mole mean number.
It is the early age strength of concrete of the polycarboxylate admixture of major ingredient (general formula 6) that the present invention is suitable for improving the graft copolymer of mixing with allyl alcohol ether and other unsaturated carboxylic acid.
Figure S2007101902953D00042
R wherein 8Be CH 3Or H; R 10For H or X is H or CH 2R 11Be the alkyl of H or 1-4 carbon atom, M is hydrogen, monovalent metallic ion, divalent-metal ion, ammonium or organic amino group.A, b are the chain number of multipolymer repeating unit, and its size is made up of and the control of molecular weight size multipolymer.N is an oxyethane addition mole mean number.
General formula 3 or 4 or 5 or 6 represented polycarboxylate admixtures are several big series products structure in the market, to a, and b and n, the size of m is not done mandatory provision, and R 8, R 9, R 10, R 11Separate.
Addition of the present invention is 0.5～1.5% of a gel material content, can impel concrete 16h ultimate compression strength to improve 30%～60%, 1d ultimate compression strength improves 25%～40%, 3d ultimate compression strength improves 15%～25%, and the 28d concrete crushing strength do not reduce, and has shortened curing cycle greatly, accelerating construction progress, improve the turnover rate of template, shorten the construction time, reduced cost.If addition is less than 0.5%, its ability that improves early age strength of concrete is unsafty so.If opposite addition surpasses 1.5%, then excessive interpolation proof only is waste economically, because do not bring the corresponding growth on the effect.Preparation is simple in the present invention, and can be to reinforcing bars rusting, the problem that can not influence concrete coagulation and cause late strength of concrete to descend.
Embodiment
Below by embodiment the present invention is specifically described, be necessary to be pointed out that at this, following examples only are used for the present invention is further specified, and can not be interpreted as limiting the scope of the invention.
A) in the embodiment of the invention, vitriol that is adopted and organic alkoxy amine kind are listed in table 1.
B) in the Application Example of the present invention, the cement that is adopted is little wild field 52.5 P.II, and sand is fineness modulus M x=2.6 medium sand, stone are that particle diameter is the rubble of 5～20mm continuous grading.
C) the concrete crushing strength test method is carried out with reference to the relevant regulations of GB8076-97 " concrete admixture ".As not making specified otherwise, all complex liquid admixture dosages calculate with liquid, and the polycarboxylate admixture is converted to solid volume meter.
D) in the application examples in the comparative example used various polycarboxylate admixtures (being called for short PC) be commercial prod, as shown in table 2.
Table 1
Organic alkoxy amine Code name Vitriol Code name
Diethanolamine tri-isopropanolamine dihydroxy ethyl ethylenediamine tetraacetic hydroxyethylethylene diamine tetrahydroxypropyl ethylenediamine A-1 A-2 A-3 A-4 A-5 Tai-Ace S 150 sal epsom ferric sulfate AS MS FS
Table 2
The superplasticizer type Code name The superplasticizer type Code name
Shown in (n=25) shown in the general formula 3 general formula 4 (n=12) PC(a) PC(b) (n=12, m=23) (n=45) shown in the general formula 6 shown in the general formula 5 PC(c) PC(d)
Embodiment 1
In the 1000L reactor, add tap water 600kg, be warming up to 40 ℃～60 ℃, drop into tetrahydroxypropyl ethylenediamine (A-5) 40kg, stir 10min, after add Tai-Ace S 150 (AS) 180kg successively, sal epsom (MS) 180kg is stirred to it and is dissolved into homogeneous solution (about 30min), composite solution called after ES-1.
Embodiment 2
In the 1000L reactor, add tap water 575kg, be warming up to 40 ℃～60 ℃, drop into diethanolamine (A-1) 15kg, tri-isopropanolamine (A-2) 20kg, stir 10min, after add sal epsom (MS) 390kg successively, be stirred to it and be dissolved into homogeneous solution (about 30min), composite solution called after ES-2.
Embodiment 3-5
Preparation technology is with embodiment 1, and just the raw material types that adopts is different with proportioning, lists in table 3.
Comparative example 1
Add tap water 650kg in the 1000L reactor, be warming up to 40 ℃～60 ℃, add Tai-Ace S 150 (AS) 350kg, stirring and dissolving is very difficult, and the cooling post crystallization is separated out.
Table 3 complex liquid raw material types and shared weight ratio thereof
Raw material types and weight ratio Concentration/%
％ Vitriol ％ Water %
Embodiment 1 embodiment 2 embodiment 3 embodiment 4 embodiment 5 comparative examples 1 ES-1 ES-2 ES-3 ES-4 ES-5 - A-5 A-1、A-2 A-3 A-4 A-1 - 4 3.5 5.5 5 6.0 - AS、MS MS AS MS、FS MS AS 36 39 30.5 35 28 35 60 57.5 65 60 66 65 40 42.5 35 40 34 35％
Application Example
Table 4
Admixture Ultimate compression strength (MPa)/compressive strength rate
Complex liquid Volume/% Polycarboxylate Volume/% 16h 1d 3d 28d
- ES-1 ES-2 ES-3 ES-4 ES-5 0 1.0 1.0 1.0 1.0 1.0 PC(a) PC(a) PC(a) PC(a) PC(a) PC(a) 0.20 0.20 0.20 0.20 0.20 0.20 26.7/100 37.0/138 37.9/142 38.6/145 36.8/138 35.9/134 38.1/100 49.7/130 53.1/139 52.8/139 51.2/134 48.1/126 58.0/100 69.4/120 70.0/121 72.1/124 71.5/123 66.7/115 90.4/100 95.2/105 93.7/103 94.5/105 94.1/104 94.4/104
ES-1 ES-1 ES-1 0.3 1.3 2.0 PC(a) PC(a) PC(a) 0.20 0.20 0.20 32.1/120 41.5/155 40.1/150 43.6/115 56.6/148 53.5/140 63.2/109 72.5/125 70.3/121 91.7/101 93.7/104 92.3/102
ES-1 ES-1 ES-1 Comparative examples A S 1.0 1.0 1.0 1.0 PC(b) PC(c) PC(d) PC(a) 0.20 0.20 0.20 0.20 36.3 38.5 39.4 31.4 48.5 51.8 53.5 42.3 70.7 70.5 71.2 61.8 89.5 92.4 93.5 86.5
Estimate potent fruit morning of embodiment 1-5 institute synthetic complex liquid, the concrete mix that test is adopted is a cement: sand: stone: water=427: 691: 1127: 135, different polycarboxylate admixtures are because the water-reducing rate difference, therefore making fresh concrete just make the slump by adjustment polycarboxylate volume is 18 ± 2cm, and test-results sees Table 4.Test-results is found out, the present invention is 0.5% of gel material content～1.5% o'clock at volume, all can increase substantially early age strength of concrete, 16h ultimate compression strength improves 30%～60%, 1d ultimate compression strength improves 25%～40%, 3d ultimate compression strength improves 15%～25%, and the 28d concrete crushing strength does not reduce.The present invention and poly carboxylic acid admixture have adaptability preferably, can be used for being suitable for the poly carboxylic acid admixture of different chemical structures is compound, improve early age strength of concrete.On the contrary, though also can improve concrete early strength to a certain extent for independent mineral sulfates, the amplitude that improves is nowhere near, and later strength also slightly descends.

Claims (4)

1. the complex liquid of the early age strength of concrete of polycarboxylate admixture is mixed in a raising, and it is characterized in that being prepared from by following compositions in weight percentage: water soluble sulfate 25-40%, organic alkoxy amine 3-6%, all the other are water.
2. the complex liquid of the early age strength of concrete of polycarboxylate admixture is mixed in raising as claimed in claim 1, it is characterized in that described organic alkoxy amine is represented by general formula (1) or general formula (2):
Figure S2007101902953C00011
R 1, R 2, R 3Independently represent H or hydroxyethyl or hydroxypropyl respectively, but R 1, R 2, R 3Can not all be H simultaneously;
R 4, R 5, R 6, R 7Respectively independent represent H or
Figure S2007101902953C00013
Or
Figure S2007101902953C00014
Y=1 or 2, but R 4, R 5, R 6, R 7Can not all be H simultaneously.
3. there is the alkoxyl group organic amine to be selected from the mixture of one or more arbitrary proportion compositions in thanomin, diethanolamine, trolamine, Yi Bingchunan, diisopropanolamine (DIPA), tri-isopropanolamine, dihydroxy ethyl quadrol, dihydroxypropyl quadrol, tetrahydroxyethyl-ethylene diamine or the tetrahydroxypropyl ethylenediamine as claimed in claim 1 or 2.
4. the preparation method of complex liquid of the early age strength of concrete of polycarboxylate admixture is mixed in any described raising of claim 1 to 3, it is characterized in that may further comprise the steps:
1) in reactor, adds entry, be warming up to 40 ℃～60 ℃, drop into the alkoxyl group organic amine again, stir;
2) drop into water soluble sulfate, stir into uniform solution, promptly.
CNA2007101902953A 2007-11-26 2007-11-26 Composite liquid for increasing early strength of concrete mixed with polycarboxylate additive Pending CN101186461A (en)

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101838124A (en) * 2010-05-19 2010-09-22 河海大学 Copolymerization-polycondensation type composite water reducing agent and application method thereof
CN103708765A (en) * 2013-12-26 2014-04-09 曹乃镛 Regulator for polycarboxylate pumping agents
CN103951304A (en) * 2014-04-15 2014-07-30 株洲宏信特种建材有限公司 Concrete reinforcing agent as well as preparation method and application thereof
CN106854048A (en) * 2015-12-09 2017-06-16 攀枝花博特建材有限公司 polycarboxylate additive and preparation method thereof
CN109095850A (en) * 2018-08-25 2018-12-28 北京建工新型建材有限责任公司 A kind of concrete mix and its Winter Construction Methods of high early strength
CN115286540A (en) * 2022-07-19 2022-11-04 北京市建筑工程研究院有限责任公司 Preparation method of fresh concrete early strength agent and fresh concrete early strength agent

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101838124A (en) * 2010-05-19 2010-09-22 河海大学 Copolymerization-polycondensation type composite water reducing agent and application method thereof
CN101838124B (en) * 2010-05-19 2012-08-15 河海大学 Copolymerization-polycondensation type composite water reducing agent and application method thereof
CN103708765A (en) * 2013-12-26 2014-04-09 曹乃镛 Regulator for polycarboxylate pumping agents
CN103708765B (en) * 2013-12-26 2016-01-20 曹乃镛 A kind of polycarboxylic acid series pumping agent conditioning agent
CN103951304A (en) * 2014-04-15 2014-07-30 株洲宏信特种建材有限公司 Concrete reinforcing agent as well as preparation method and application thereof
CN103951304B (en) * 2014-04-15 2015-09-09 株洲宏信特种建材有限公司 A kind of concrete intensifier and its preparation method and application
CN106854048A (en) * 2015-12-09 2017-06-16 攀枝花博特建材有限公司 polycarboxylate additive and preparation method thereof
CN109095850A (en) * 2018-08-25 2018-12-28 北京建工新型建材有限责任公司 A kind of concrete mix and its Winter Construction Methods of high early strength
CN109095850B (en) * 2018-08-25 2021-07-20 北京建工新型建材有限责任公司 High-early-strength concrete mixture and winter construction method thereof
CN115286540A (en) * 2022-07-19 2022-11-04 北京市建筑工程研究院有限责任公司 Preparation method of fresh concrete early strength agent and fresh concrete early strength agent

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