CN105693134A - Functional concrete admixture - Google Patents
Functional concrete admixture Download PDFInfo
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- CN105693134A CN105693134A CN201511016209.8A CN201511016209A CN105693134A CN 105693134 A CN105693134 A CN 105693134A CN 201511016209 A CN201511016209 A CN 201511016209A CN 105693134 A CN105693134 A CN 105693134A
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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
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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
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/60—Agents for protection against chemical, physical or biological attack
Abstract
The invention relates to a functional concrete admixture. The functional concrete admixture is mainly prepared from crosslinked polyethylene-based siloxane and/or crosslinked polyhexene-based siloxane, poly methyl phenyl silsesquioxane, alkoxy silane, stearate, fatty amine polyoxyethylene ether and fatty amine polyoxyethylene ester. The functional concrete admixture can reduce the water absorption rate of concrete, improve the hydrophobicity of concrete and inhibit aggressive medium space transmission. By the adoption of the functional concrete admixture, the corrosion resistance of concrete can be improved greatly, and then the durability of concrete is improved remarkably.
Description
Technical field
The present invention relates to a kind of functional concrete admixture。
Background technology
Concrete admixture is to mix in ready-mixed concrete process, accounts for cement quality less than 5%, can significantly improve the chemical substance of concrete performance, mixes additive in concrete, has small investment, instant effect, technical economic benefit outstanding feature。Along with the continuous progress of science and technology, additive has been increasingly being application, and in engineering, conventional additive can be divided into four classes:
1, the additive of concrete mix rheological property is improved。Including water reducer, air entraining agent and pumping admixture。
2, the additive of concrete coagulating time, hardening capacity is regulated。Including retarder, early strength agent and accelerator。
3, the additive of concrete durability is improved。Including air entraining agent, waterproofing agent and corrosion inhibitor etc.。
4, the additive of other performances of concrete is improved。Including air-entrainment, extender, antifreezing agent, coloring agent, waterproofing agent and pumping admixture
These additives have the advantages that to improve a certain performance of concrete。But there is presently no a kind of functional additive to be exploited for solving concrete corrosion-resistant property under adverse circumstances。In the presence of a harsh environment, owing to the chloride ion in surrounding medium or the chloride ion in concrete raw material penetrate into around reinforcing bar; the passivating film of reinforcing bar is destroyed after reaching finite concentration; cause steel bar corrosion; cut down its effective cross-section; reduce the stress performances such as its adhesion strength; make concrete cover along muscle spalling, be the Major Diseases affecting concrete structure durability, caused most attention both domestic and external。
During current engineering design; method is adopted to have for preventing concrete resistant to corrosion: to improve strength grade of concrete, increase thickness of concrete cover or in concrete surface brushing resistant to corrosion coating; but all there is obvious drawback in these methods, it does not have fundamentally suppress etching medium in the transmission of inside concrete。The concrete approach of such as Chloride Attack generally has two kinds: the first " is mixed into ", and as mixed chloride ion-containing additive, construction water chloride ion-containing, in saline environment, mixing pours into a mould concrete etc.；It two is " infiltration ", and the chloride ion in environment is penetrated in concrete by concrete macroscopic view, microdefect, and arrives rebar surface。" it is mixed into " problem that phenomenon is mostly construction management；" infiltration " phenomenon is then polytechnic problem, and with concrete material porous, density, construction quality, the many factors such as rebar surface concrete layer thickness is relevant。
Summary of the invention
Fail fundamentally to suppress etching medium in the problem of the transmission of inside concrete for existing concrete additive, the present invention provides a kind of functional concrete admixture, concrete rate of water absorption can being reduced, improving concrete hydrophobicity, suppressing etching medium holetransport, thus significantly improving concrete durability。
In the present invention, adopt multiple elements design technology, first by poly-to crosslinked polyethylene radical siloxane and/or crosslinking vinyl siloxanes, polymethyl-benzene base silsesquioxane, alkoxy silane, stearic acid salt, aliphatic amine polyoxyethylene base ether, aliphatic acid polyethenoxy base ester effectively combines, utilize crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking, alkoxy silane and the concrete reactivity of alkalescence, increase this additive material cement reaction site quantity in mix process, utilize the nano effect of polymethyl-benzene base silsesquioxane, reduce concrete pore rate thus improving compactness, the hydrophobic interaction utilizing stearic acid salt improves concrete hydrophobicity, reduce concrete rate of water absorption, utilize aliphatic acid polyethenoxy base ether, the quick easy scattered diffusion activity of aliphatic acid polyethenoxy base ester, be conducive to this additive material dispersed in concrete mixing process, avoid reuniting。Each component effectively combines and produces cooperative effect, overcomes its respective shortcoming, efficiently suppressing etching medium transmission under adverse circumstances, reducing concrete charge pass, improving concrete resistance to chloride erosion performance thus significantly improving concrete durability。
Functional concrete admixture of the present invention comprises consisting of, in weight fraction:
Described crosslinked polyethylene radical siloxane, is the liquid cross linking polysiloxane obtained with ethenyl blocking siloxanes and platinum group metal complex catalysis；
Described ethenyl blocking siloxanes is selected from one or both in following components: the dimethyl siloxane of dimethyl ethenyl end-blocking；The dimethyl siloxane of dimethyl ethenyl end-blocking；The methyl vinyl silicone of dimethyl ethenyl end-blocking；Polydimethylsiloxane-Polymethyl methacrylate the copolymer of vinyl-dimethyl base siloxy end-blocking；The polydimethylsiloxanepolymer polymer of vinyl-dimethyl oxygen base siloxy end-blocking or the polydimethylsiloxanepolymer polymer of hexenyl dimethylsilyl bis end-blocking；Aforementioned silicone copolymer and siloxane polymer its each the degree of polymerization be 10-100。
Described crosslinking polyhexene radical siloxane is the liquid crosslinking gained obtained by hexenyl endcapped siloxanes and platinum group metal complex catalysis；
Described hexenyl endcapped siloxanes is selected from: the polydimethylsiloxanepolymer polymer of the polydimethylsiloxanes of vinyl dimethylsilyl bis end-blocking-poly-methylhexenylsiloxane copolymer or vinyl dimethylsilyl bis end-blocking, the degree of polymerization is 10-100。
The preparation method of described crosslinked polyethylene radical siloxane or the poly-vinyl siloxanes of crosslinking: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, ethenyl blocking siloxanes or hexenyl endcapped siloxanes is added at 25 DEG C, add platinum catalyst and be warming up to 80 DEG C, stirring reaction 1-2h, add reaction terminating stabilizer 1-acetenyl-1-Hexalin, be down to room temperature and get final product。
Described polymethyl-benzene base silsesquioxane is the polymethyl-benzene base silsesquioxane obtained with phenyl triethoxysilane, MTES hydrolytic condensation。
The preparation method of described polymethyl-benzene base silsesquioxane: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, add MTES, propyl-triethoxysilicane, 0.0lmol/L hydrochloric acid, at 50 DEG C, react 30min, then be warmed up to 70 DEG C of reaction 2h；Then, at 80 DEG C, gained hydrolyzate is reacted 3h with triethylamine in methylisobutylketone, neutralize with hydrochloric acid, namely obtain polymethyl-benzene base silsesquioxane。
Described oxyalkylsiloxane contains following components: any one in MTES, butyl trimethoxy silane, butyl triethoxysilane, octyl group trimethoxy silane, octyltri-ethoxysilane, isooctyltrimethoxysi,ane, dodecyltrimethoxysilane, dodecyl triethoxysilane is above with arbitrary proportion mixing。
Any one in zinc stearate, calcium stearate, the magnesium stearate of described stearate is above to be mixed with arbitrary proportion。
Any one in lauryl amine polyoxyethylene ether, the 18-amine. polyoxyethylene ether of described aliphatic amine polyoxyethylene base ether is above to be mixed with arbitrary proportion。
Any one in stearic acid polyoxyethylene base ester, lauric acid polyoxyethylene groups ester, the oleic acid polyoxyethylene groups ester of described aliphatic acid polyethenoxy base ester is above to be mixed with arbitrary proportion。
Described functional concrete admixture having reduction concrete charge pass, improving concrete resistance to chloride erosion performance, suppressing etching medium under adverse circumstances to corrode thus significantly improving the effect of concrete durability。
The preparation method of functional concrete admixture of the present invention is: namely each component mix homogeneously at 60 DEG C is obtained functional concrete admixture of the present invention。
The using method of functional concrete admixture of the present invention is: add this additive in concrete mixing process, and consumption 1-5kg recommended by every side concrete, uses with the uniform after-pouring of the mix such as adhesive material, aggregate。
Described functional concrete admixture suppresses etching medium to have a uniqueness and obvious action in inside concrete transmission in the presence of a harsh environment, and this additive can reduce concrete carbonization speed, electric flux, chloride permeability coefficient, it is provided that concrete impervious grade。This additive is based on cross-linking modified Si-O-Si structure, there is high stability and corrosion resistance, functional hydrophobic group and the effect improved concrete microporous structure of nano-scale, and the cooperative effect playing each component realizes suppressing etching medium transmission purpose, when compared with the similar material compositions without component disclosed by the invention, the material feed composition of the present invention can be shown that the functional capability dramatically increased。
Detailed description of the invention
Further illustrate the present invention by embodiment below, but the present invention is not intended to be limited thereto。
Embodiment 1
1) prepared by crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, be sequentially added at 25 DEG C 400g vinyl-dimethyl base siloxy end-blocking polydimethylsiloxane-Polymethyl methacrylate copolymer, 15g divinyl tetramethyl disiloxane, 5g vinyltrimethoxy silane add platinum catalyst be warming up to 80 DEG C, stirring reaction 1-2h, add reaction terminating stabilizer 1-acetenyl-1-Hexalin 1.2g, be down to room temperature and obtain viscous liquid。
2) preparation of polymethyl-benzene base silsesquioxane: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, add MTES 160ml, propyl-triethoxysilicane 10ml, 0.0lmol/L hydrochloric acid 10mL, at 50 DEG C, react 30min, then be warmed up to 70 DEG C of reaction 2h；Then, at 80 DEG C, gained hydrolyzate is reacted 3h with triethylamine in methylisobutylketone, neutralize with hydrochloric acid, obtain polymethyl-benzene base silsesquioxane。
3) preparation of functional concrete admixture: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, be sequentially added into crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking at 25 DEG C, polymethyl-benzene base silsesquioxane, oxyalkylsiloxane, stearic acid, stearate, aliphatic amine polyoxyethylene base ether, aliphatic acid polyethenoxy base ester were warming up to 60 DEG C of mechanical agitation after 2 hours, after adding nano silicon, nano titanium oxide continuation stirring 30min, it is cooled to room temperature discharging, obtains this functional concrete admixture。
Embodiment 2
1) prepared by crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking: have agitator at device, reflux condensing tube, in the reaction unit of thermometer, polydimethylsiloxane-Polymethyl methacrylate the copolymer of 230g vinyl-dimethyl base siloxy end-blocking it is sequentially added at 25 DEG C, the polydimethylsiloxanes of 270g vinyl dimethylsilyl bis end-blocking-poly-methylhexenylsiloxane copolymer, 20g divinyl tetramethyl disiloxane, add platinum catalyst and be warming up to 80 DEG C, stirring reaction 1-2h, add reaction terminating stabilizer 1-acetenyl-1-Hexalin 1.4g, it is down to room temperature and obtains viscous liquid。
2) preparation of polymethyl-benzene base silsesquioxane: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, add MTES 170ml, propyl-triethoxysilicane 15ml, 0.0lmol/L hydrochloric acid 25mL, at 50 DEG C, react 30min, then be warmed up to 70 DEG C of reaction 2h；Then, at 80 DEG C, gained hydrolyzate is reacted 3h with triethylamine in methylisobutylketone, neutralize with hydrochloric acid, obtain polymethyl-benzene base silsesquioxane。
3) preparation of functional concrete admixture: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, be sequentially added into crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking at 25 DEG C, polymethyl-benzene base silsesquioxane, oxyalkylsiloxane, stearate, aliphatic amine polyoxyethylene base ether, aliphatic acid polyethenoxy base ester were warming up to 60 DEG C of mechanical agitation after 2 hours, it is cooled to room temperature discharging, obtains functional concrete admixture。
Embodiment 3
1) prepared by crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking: have agitator at device, reflux condensing tube, in the reaction unit of thermometer, it is sequentially added into divinyl tetramethyl disiloxane at 25 DEG C, tetramethyl tetravinyl cyclosiloxane, vinyltrimethoxy silane, VTES, polydimethylsiloxane-Polymethyl methacrylate the copolymer of vinyl-dimethyl base siloxy end-blocking, the polydimethylsiloxanes of vinyl dimethylsilyl bis end-blocking-poly-methylhexenylsiloxane copolymer, the polydimethylsiloxanepolymer polymer of vinyl-dimethyl oxygen base siloxy end-blocking or the polydimethylsiloxanepolymer polymer of hexenyl dimethylsilyl bis end-blocking, add platinum catalyst and be warming up to 80 DEG C, stirring reaction 1-2h, add reaction terminating stabilizer 1-acetenyl-1-Hexalin 0。3%, it is down to room temperature and obtains viscous liquid。
2) preparation of polymethyl-benzene base silsesquioxane: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, add MTES 170ml, propyl-triethoxysilicane 15ml, 0.0lmol/L hydrochloric acid 25mL, at 50 DEG C, react 30min, then be warmed up to 70 DEG C of reaction 2h；Then, at 80 DEG C, gained hydrolyzate is reacted 3h with triethylamine in methylisobutylketone, neutralize with hydrochloric acid, obtain polymethyl-benzene base silsesquioxane。
3) preparation of functional concrete admixture: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, be sequentially added into crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking at 25 DEG C, polymethyl-benzene base silsesquioxane, oxyalkylsiloxane, stearate, aliphatic amine polyoxyethylene base ether, aliphatic acid polyethenoxy base ester were warming up to 60 DEG C of mechanical agitation after 2 hours, it is cooled to room temperature discharging, obtains functional concrete admixture。
Embodiment 5
1) prepared by crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking: have agitator at device, reflux condensing tube, in the reaction unit of thermometer, polydimethylsiloxanes-poly-methylhexenylsiloxane the copolymer of 260g vinyl dimethylsilyl bis end-blocking it is sequentially added at 25 DEG C, the polydimethylsiloxanepolymer polymer of 100g vinyl-dimethyl oxygen base siloxy end-blocking, 13g VTES, 7g divinyl tetramethyl disiloxane, add platinum catalyst and be warming up to 80 DEG C, stirring reaction 1-2h, add reaction terminating stabilizer 1-acetenyl-1-Hexalin 1.5g, it is down to room temperature and obtains viscous liquid。
2) preparation of polymethyl-benzene base silsesquioxane: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, add MTES 150ml, propyl-triethoxysilicane 20ml, 0.0lmol/L hydrochloric acid 10mL, at 50 DEG C, react 30min, then be warmed up to 70 DEG C of reaction 2h；Then, at 80 DEG C, gained hydrolyzate is reacted 3h with triethylamine in methylisobutylketone, neutralize with hydrochloric acid, obtain polymethyl-benzene base silsesquioxane。
3) preparation of functional concrete admixture: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, be sequentially added into crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking at 25 DEG C, polymethyl-benzene base silsesquioxane, oxyalkylsiloxane, stearate, aliphatic amine polyoxyethylene base ether, aliphatic acid polyethenoxy base ester were warming up to 60 DEG C of mechanical agitation after 2 hours, it is cooled to room temperature discharging, obtains functional concrete admixture。
Embodiment 6
1) prepared by crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking: have agitator at device, reflux condensing tube, in the reaction unit of thermometer, polydimethylsiloxanes-poly-methylhexenylsiloxane the copolymer of 260g vinyl dimethylsilyl bis end-blocking it is sequentially added at 25 DEG C, the polydimethylsiloxanepolymer polymer of 100g vinyl-dimethyl oxygen base siloxy end-blocking, 13g VTES, 7g divinyl tetramethyl disiloxane, add platinum catalyst and be warming up to 80 DEG C, stirring reaction 1-2h, add reaction terminating stabilizer 1-acetenyl-1-Hexalin 1.5g, it is down to room temperature and obtains viscous liquid。
2) preparation of polymethyl-benzene base silsesquioxane: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, add MTES 150ml, propyl-triethoxysilicane 20ml, 0.0lmol/L hydrochloric acid 10mL, at 50 DEG C, react 30min, then be warmed up to 70 DEG C of reaction 2h；Then, at 80 DEG C, gained hydrolyzate is reacted 3h with triethylamine in methylisobutylketone, neutralize with hydrochloric acid, obtain polymethyl-benzene base silsesquioxane。
3) preparation of functional concrete admixture: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, be sequentially added into crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking at 25 DEG C, polymethyl-benzene base silsesquioxane, oxyalkylsiloxane, stearate, aliphatic amine polyoxyethylene base ether, aliphatic acid polyethenoxy base ester were warming up to 60 DEG C of mechanical agitation after 2 hours, it is cooled to room temperature discharging, obtains functional concrete admixture。
Embodiment 7
1) prepared by crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking: have agitator at device, reflux condensing tube, in the reaction unit of thermometer, 10g divinyl tetramethyl disiloxane it is sequentially added at 25 DEG C, 10g VTES, the polydimethylsiloxanepolymer polymer of 100g vinyl-dimethyl oxygen base siloxy end-blocking, the polydimethylsiloxanepolymer polymer of 150g hexenyl dimethylsilyl bis end-blocking, add platinum catalyst and be warming up to 80 DEG C, stirring reaction 1-2h, add reaction terminating stabilizer 1-acetenyl-1-Hexalin 1.05g, it is down to room temperature and obtains viscous liquid。
2) preparation of polymethyl-benzene base silsesquioxane: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, add MTES 180ml, propyl-triethoxysilicane 20ml, 0.0lmol/L hydrochloric acid 10mL, at 50 DEG C, react 30min, then be warmed up to 70 DEG C of reaction 2h；Then, at 80 DEG C, gained hydrolyzate is reacted 3h with triethylamine in methylisobutylketone, neutralize with hydrochloric acid, obtain polymethyl-benzene base silsesquioxane。
3) preparation of functional concrete admixture: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, be sequentially added into crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking at 25 DEG C, polymethyl-benzene base silsesquioxane, oxyalkylsiloxane, stearate, aliphatic amine polyoxyethylene base ether, aliphatic acid polyethenoxy base ester were warming up to 60 DEG C of mechanical agitation after 2 hours, it is cooled to room temperature discharging, obtains functional concrete admixture。
Embodiment 8
1) prepared by crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking: have agitator at device, reflux condensing tube, in the reaction unit of thermometer, 10g divinyl tetramethyl disiloxane it is sequentially added at 25 DEG C, 10g VTES, the polydimethylsiloxanepolymer polymer of 100g vinyl-dimethyl oxygen base siloxy end-blocking, the polydimethylsiloxanepolymer polymer of 150g hexenyl dimethylsilyl bis end-blocking, add platinum catalyst and be warming up to 80 DEG C, stirring reaction 1-2h, add reaction terminating stabilizer 1-acetenyl-1-Hexalin 1.05g, it is down to room temperature and obtains viscous liquid。
2) preparation of polymethyl-benzene base silsesquioxane: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, add MTES 180ml, propyl-triethoxysilicane 20ml, 0.0lmol/L hydrochloric acid 10mL, at 50 DEG C, react 30min, then be warmed up to 70 DEG C of reaction 2h；Then, at 80 DEG C, gained hydrolyzate is reacted 3h with triethylamine in methylisobutylketone, neutralize with hydrochloric acid, obtain polymethyl-benzene base silsesquioxane。
3) preparation of functional concrete admixture: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, be sequentially added into crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking at 25 DEG C, polymethyl-benzene base silsesquioxane, oxyalkylsiloxane, stearate, aliphatic amine polyoxyethylene base ether, aliphatic acid polyethenoxy base ester were warming up to 60 DEG C of mechanical agitation after 2 hours, it is cooled to room temperature discharging, obtains functional concrete admixture。
Embodiment 9
1) prepared by crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, 10g tetramethyl tetravinyl cyclosiloxane it is sequentially added at 25 DEG C, 20g vinyltrimethoxy silane, polydimethylsiloxane-Polymethyl methacrylate the copolymer of 350g vinyl-dimethyl base siloxy end-blocking, add platinum catalyst and be warming up to 80 DEG C, stirring reaction 1-2h, add reaction terminating stabilizer 1-acetenyl-1-Hexalin 1.8g, be down to room temperature and obtain viscous liquid。
2) preparation of polymethyl-benzene base silsesquioxane and polymethyl-benzene base silsesquioxane: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, add MTES 180ml, propyl-triethoxysilicane 20ml, 0.0lmol/L hydrochloric acid 10mL, at 50 DEG C, react 30min, then be warmed up to 70 DEG C of reaction 2h；Then, at 80 DEG C, gained hydrolyzate is reacted 3h with triethylamine in methylisobutylketone, neutralize with hydrochloric acid, obtain polymethyl-benzene base silsesquioxane。
3) preparation of functional concrete admixture: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, be sequentially added into crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking at 25 DEG C, polymethyl-benzene base silsesquioxane, oxyalkylsiloxane, stearate, aliphatic amine polyoxyethylene base ether, aliphatic acid polyethenoxy base ester were warming up to 60 DEG C of mechanical agitation after 2 hours, it is cooled to room temperature discharging, obtains functional concrete admixture。
Embodiment 10
1) prepared by crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking: have agitator at device, reflux condensing tube, in the reaction unit of thermometer, 10g divinyl tetramethyl disiloxane it is sequentially added at 25 DEG C, 5g tetramethyl tetravinyl cyclosiloxane, 10g VTES, polydimethylsiloxane-Polymethyl methacrylate the copolymer of 150g vinyl-dimethyl base siloxy end-blocking, the polydimethylsiloxanes of 150g vinyl dimethylsilyl bis end-blocking-poly-methylhexenylsiloxane copolymer, add platinum catalyst and be warming up to 80 DEG C, stirring reaction 1-2h, add reaction terminating stabilizer 1-acetenyl-1-Hexalin 1.5g, it is down to room temperature and obtains viscous liquid。
2) preparation of polymethyl-benzene base silsesquioxane: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, add MTES 180ml, propyl-triethoxysilicane 20ml, 0.0.lmol/L hydrochloric acid 10mL, at 50 DEG C, react 30min, then be warmed up to 70 DEG C of reaction 2h；Then, at 80 DEG C, gained hydrolyzate is reacted 3h with triethylamine in methylisobutylketone, neutralize with hydrochloric acid, obtain polymethyl-benzene base silsesquioxane。
3) preparation of functional concrete admixture: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, be sequentially added into crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking at 25 DEG C, polymethyl-benzene base silsesquioxane, oxyalkylsiloxane, stearate, aliphatic amine polyoxyethylene base ether, aliphatic acid polyethenoxy base ester were warming up to 60 DEG C of mechanical agitation after 2 hours, it is cooled to room temperature discharging, obtains functional concrete admixture。
Application examples
Filling and carry out contrast experiment after this concrete admixture carries out C40 concrete formation experiment, evaluate the erosion medium resistance rejection of material, result is as shown in table 1。Concrete sample processes through dry cleansing after 28d maintenance, and all test specimens carry out under same experimental conditions。Wherein seepage-resistant grade reference standard GB/T50082-2009 tests, water absorption rate reference standard BS1881:part122:1983 tests, chlorine ion binding capacity water suction is tested with reference to JTG/TB07-01-2006, and electric flux reference standard JTJ275-2000 tests。
Table 1 fills the concrete corrosion-resistant property contrast of this functional concrete admixture
Upper table empty test specimen is the concrete performance being not spiked with functional additive involved in the present invention, contrast 1, 2, 3, 4, 5 is be not spiked with crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes of crosslinking respectively, it is not spiked with polymethyl-benzene base silsesquioxane, it is not spiked with alkoxy silane, it is not spiked with stearate and is not spiked with aliphatic amine polyoxyethylene base ether, the obtained concrete performance of aliphatic acid polyethenoxy base ester, can be seen that when adopting blank sample or lacking the material of constituent part by data in upper table, concrete chloride diffusion coefficient, electric flux, the performances such as water absorption rate are substantially deteriorated, and after adopting functional additive involved in the present invention, significantly reduce concrete rate of water absorption, improve concrete hydrophobicity, and suppress etching medium particularly chloride ion at concrete voids transmitting effect。It is thus possible to concrete corrosion-resistant property is greatly improved, thus significantly improving concrete durability。
Claims (6)
1. a functional concrete admixture, it is characterised in that comprise consisting of, in weight fraction:
Crosslinked polyethylene radical siloxane and/or the poly-vinyl siloxanes 25-45 of crosslinking,
Polymethyl-benzene base silsesquioxane 15-20,
Alkoxy silane 5-10,
Stearate 1-5,
Aliphatic amine polyoxyethylene base ether 1-5,
Aliphatic acid polyethenoxy base ester 1-5；
Described crosslinked polyethylene radical siloxane, is the liquid cross linking polysiloxane obtained with ethenyl blocking siloxanes and platinum group metal complex catalysis；
Described crosslinking polyhexene radical siloxane is the liquid crosslinking gained obtained by hexenyl endcapped siloxanes and platinum group metal complex catalysis；
Described polymethyl-benzene base silsesquioxane is the polymethyl-benzene base silsesquioxane obtained with phenyl triethoxysilane, MTES hydrolytic condensation；
Described oxyalkylsiloxane contains following components: any one in MTES, butyl trimethoxy silane, butyl triethoxysilane, octyl group trimethoxy silane, octyltri-ethoxysilane, isooctyltrimethoxysi,ane, dodecyltrimethoxysilane, dodecyl triethoxysilane is above with arbitrary proportion mixing；
Any one in zinc stearate, calcium stearate, the magnesium stearate of described stearate is above to be mixed with arbitrary proportion；
Any one in lauryl amine polyoxyethylene ether, the 18-amine. polyoxyethylene ether of described aliphatic amine polyoxyethylene base ether is above to be mixed with arbitrary proportion；
Any one in stearic acid polyoxyethylene base ester, lauric acid polyoxyethylene groups ester, the oleic acid polyoxyethylene groups ester of described aliphatic acid polyethenoxy base ester is above to be mixed with arbitrary proportion。
2. functional concrete admixture according to claim 1, it is characterised in that described ethenyl blocking siloxanes is selected from one or both in following components: the dimethyl siloxane of dimethyl ethenyl end-blocking；The dimethyl siloxane of dimethyl ethenyl end-blocking；The methyl vinyl silicone of dimethyl ethenyl end-blocking；Polydimethylsiloxane-Polymethyl methacrylate the copolymer of vinyl-dimethyl base siloxy end-blocking；The polydimethylsiloxanepolymer polymer of vinyl-dimethyl oxygen base siloxy end-blocking or the polydimethylsiloxanepolymer polymer of hexenyl dimethylsilyl bis end-blocking；Aforementioned silicone copolymer and siloxane polymer its each the degree of polymerization be 10-100。
3. functional concrete admixture according to claim 1, it is characterized in that, described hexenyl endcapped siloxanes is selected from: the polydimethylsiloxanepolymer polymer of the polydimethylsiloxanes of vinyl dimethylsilyl bis end-blocking-poly-methylhexenylsiloxane copolymer or vinyl dimethylsilyl bis end-blocking, the degree of polymerization is 10-100。
4. the functional concrete admixture according to claim 1,2 or 3, it is characterized in that, the preparation method of described crosslinked polyethylene radical siloxane or the poly-vinyl siloxanes of crosslinking: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, ethenyl blocking siloxanes or hexenyl endcapped siloxanes is added at 25 DEG C, add platinum catalyst and be warming up to 80 DEG C, stirring reaction 1-2h, adds reaction terminating stabilizer 1-acetenyl-1-Hexalin, is down to room temperature and get final product。
5. functional concrete admixture according to claim 1, it is characterized in that, the preparation method of described polymethyl-benzene base silsesquioxane: have in the reaction unit of agitator, reflux condensing tube, thermometer at device, add MTES, propyl-triethoxysilicane, 0.0lmol/L hydrochloric acid, reacts 30min at 50 DEG C, then is warmed up to 70 DEG C of reaction 2h；Then, at 80 DEG C, gained hydrolyzate is reacted 3h with triethylamine in methylisobutylketone, neutralize with hydrochloric acid, namely obtain polymethyl-benzene base silsesquioxane。
6. the preparation method of the functional concrete admixture described in any one in claim 1-5, it is characterised in that namely each component mix homogeneously at 60 DEG C is obtained described functional concrete admixture。
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