CN103011660A - Method for preparing concrete water reducing agent, method for preparing concrete early strength agent through water reducing agent and construction method for concrete early strength agent - Google Patents
Method for preparing concrete water reducing agent, method for preparing concrete early strength agent through water reducing agent and construction method for concrete early strength agent Download PDFInfo
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- CN103011660A CN103011660A CN2012105612147A CN201210561214A CN103011660A CN 103011660 A CN103011660 A CN 103011660A CN 2012105612147 A CN2012105612147 A CN 2012105612147A CN 201210561214 A CN201210561214 A CN 201210561214A CN 103011660 A CN103011660 A CN 103011660A
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Abstract
The invention provides a method for preparing concrete water reducing agent, a method for preparing concrete early strength agent through the water reducing agent and a construction method for the concrete early strength agent. The method for preparing polyester polycarboxylic acid water reducing agent includes the steps: firstly, charging raw materials in proportion, secondly, dropwise adding initiating agent at the temperature of 65-90 DEG C for 1.5-5 hours, and performing heat preservation for reaction for 0.5-3 hours after dropwise adding the agent; and thirdly, adjusting the pH value of a mixed liquor through a sodium hydroxide solution so as to obtain the water reducing agent. The method for preparing concrete early strength agent includes the step of uniformly mixing the water reducing agent, early strength components and water in proportion, so as to obtain the concrete early strength agent. The construction method for the concrete early strength agent includes the step of adding the concrete early strength agent of which the mass is 0.8%-2.8% of the total mass of concrete, and then uniformly stirring. According to the invention, the water reducing agent is better compatible with the early strength components, can be applied in concrete after being combined with the early strength components, and brings no influence on flowing property of concrete, the early strength of concrete is greatly improved, and the later strength of concrete is not reduced.
Description
Technical field
The invention belongs to concrete manufacture field in the material of construction, be specifically related to the hardening accelerator in the concrete processing.
Background technology
In recent years, along with the economic sustained and rapid development of China, capital construction dynamics and the scale of China also continue to increase, and the application of concrete member is also more and more.In concrete member is produced for tension reinforcing steel bar as early as possible, accelerate template and have enough to meet the need and the pedestal utilization ratio, and accelerate the engineering construction progress and complete early, realize maximum economic benefit, this just needs to adopt concrete early strength agent to promote hydrated cementitious, shorten concrete coagulating time, accelerate the early age strength of concrete tempo.Along with the development of construction work, hardening accelerator more and more is used for concrete works.
China's concrete early strength agent commonly used has villaumite system, vitriol system, carbonate system, organic system etc. at present.There is obvious action of rust in villaumite system to reinforcing bar.Singly mix vitriol system, consumption too conference affects the adaptability problem of concrete admixture.Because the at present development of architectural engineering technology, certain independent admixture has been difficult to reach the construction requirement of Practical Project complicacy, singularity.In general hardening accelerator or retardant etc. all need and the efficient or composite use of high-performance water reducing agent, to reach some complicated engineering to the good workability of concrete and the requirement of the contour performance of high-strength durable, therefore, adaptability problem can make hardening accelerator be restricted to a great extent.The hardening accelerator of other types also all exists in strong poor effect early or affect later strength, or raw material sources difficulty production high in cost of production problem.
In sum, rely on merely the hardening accelerator of above type, be difficult to reach concrete morning of strong requirement, all more or less have adaptability problem or affect the familiar lacunas such as later strength, be difficult to apply widely.
Summary of the invention
The objective of the invention is from the molecular structure of polycarboxylate water-reducer own, improve the adaptability of itself and accelerating component, so that itself and accelerating component compound after, realization concrete that can not only be excellent is potent fruit early, but also avoid the adaptability problem of poly carboxylic acid and accelerating component, do not affect post-strength of concrete.
The present invention solves above-mentioned prior art problem by implementing following technical scheme and processing step:
(1) with monomethyl polyethylene glycol acrylate ester: methylpropene sodium sulfonate: methyl acrylate: methacrylic acid is made into by the mol ratio of 1: 0.038～0.16:0.24～0.48:2～4 that the aqueous solution is disposable to feed intake;
(2) heating in water bath to 65～90 ℃ dripped initiator in 1.5～5 hours, and the initiator quality accounts for 0.1～0.3% of the total system quality of reaction, dripped behind the initiator insulation reaction 0.5-3 hour;
(3) after reaction finishes, being cooled to room temperature, is that 30% sodium hydroxide solution adjusting pH of mixed is 6～8 with massfraction; Make the polyester polycarboxylate water-reducer.
The present invention also provides a kind of method for preparing concrete early strength agent, the polyester polycarboxylate water-reducer of above-mentioned preparation is mixed with accelerating component, water, the solid content of polyester polycarboxylate water-reducer: accelerating component: water mixes by the mass ratio of 6～20:0.5～8.0:72～93.5, namely makes concrete early strength agent.
In order to obtain better result of use, the present invention can also implement following technical measures: above-mentioned accelerating component is sodium sulfate, the solid content of polyester polycarboxylate water-reducer: sodium sulfate: water mixes by the mass ratio of 6～20:2.0～8.0:72～92; Above-mentioned accelerating component is trolamine, the solid content of polyester polycarboxylate water-reducer: trolamine: water mixes by the mass ratio of 6～20:0.5～2.0:78～93.5; Above-mentioned accelerating component is trolamine and sodium sulfate mixture, and trolamine: sodium sulfate mixes by the mass ratio of 1:5～20.
The present invention also provides a kind of constructional method of concrete early strength agent, and its processing step is: in 0.8～2.8% volume adding concrete of concrete early strength agent with the concrete gel material total mass with above-mentioned preparation, stirring gets final product.
Through evidence, polyester polycarboxylate water-reducer and the accelerating component of this technique preparation have good consistency, be applied in the concrete after compound with accelerating component, concrete flowability can be uninfluenced, and the concrete early strength of raising that can be fabulous, the while is not reduced the strength property of later concrete.
Embodiment
Embodiment one
In the four-hole boiling flask that reflux exchanger, nitrogen protection and mechanical stirrer are housed; with four kinds of monomer monomethyl polyethylene glycol acrylate esters, methylpropene sodium sulfonate, methyl acrylate, methacrylic acid, be made into by the mol ratio of 1:0.038:0.48:4 that the aqueous solution is disposable to feed intake.Heating in water bath to 65 ℃ dripped initiator in 1.5 hours.Initiator is ammonium persulphate, and consumption accounts for 0.1% of the total system quality of reaction, reacts 3 hours.After reaction finishes, being cooled to room temperature, is that 30% sodium hydroxide solution adjusting pH value is 6 with massfraction.
Embodiment two
In the four-hole boiling flask that reflux exchanger, nitrogen protection and mechanical stirrer are housed; with four kinds of monomer monomethyl polyethylene glycol acrylate esters, methylpropene sodium sulfonate, methyl acrylate, methacrylic acid, be made into by the 1:0.16:0.24:2 mol ratio that the aqueous solution is disposable to feed intake.Heating in water bath to 90 ℃ dripped initiator in 5 hours.Initiator is hydrogen peroxide, and consumption accounts for 0.3% of the total system quality of reaction, reacts 2 hours.After reaction finishes, being cooled to room temperature, is that 30% sodium hydroxide solution adjusting pH value is 7 with massfraction.
Embodiment three
In the four-hole boiling flask that reflux exchanger, nitrogen protection and mechanical stirrer are housed; with four kinds of monomer monomethyl polyethylene glycol acrylate esters, methylpropene sodium sulfonate, methyl acrylate, methacrylic acid, be made into by the 1:0.08:0.4:3 mol ratio that the aqueous solution is disposable to feed intake.Heating in water bath to 80 ℃ dripped initiator in 2.5 hours.Initiator is ammonium persulphate and Potassium Persulphate, and the mass ratio of ammonium persulphate and Potassium Persulphate is 1:1, and the total consumption of initiator accounts for 0.2% of the total system quality of reaction, reacts 0.5 hour.After reaction finishes, being cooled to room temperature, is that 30% sodium hydroxide solution adjusting pH value is 8 with massfraction.
Embodiment four
In the four-hole boiling flask that reflux exchanger, nitrogen protection and mechanical stirrer are housed; with four kinds of monomer monomethyl polyethylene glycol acrylate esters, methylpropene sodium sulfonate, methyl acrylate, methacrylic acid, be made into by the 1:0.1:0.3:2.5 mol ratio that the aqueous solution is disposable to feed intake.Heating in water bath to 70 ℃ dripped initiator in 3.5 hours.Initiator is hydrogen peroxide, Potassium Persulphate and azo-bis-isobutyl cyanide, and the mass ratio of hydrogen peroxide, Potassium Persulphate and azo-bis-isobutyl cyanide is 1:1:2, and the total consumption of initiator accounts for 0.25% of the total system quality of reaction, reacts 1 hour.After reaction finishes, being cooled to room temperature, is that 30% sodium hydroxide solution adjusting pH value is 7.5 with massfraction.
Embodiment five
In the four-hole boiling flask that reflux exchanger, nitrogen protection and mechanical stirrer are housed; with four kinds of monomer monomethyl polyethylene glycol acrylate esters (MPEGAA), methylpropene sodium sulfonate (SMS), methyl acrylate (MA), methacrylic acid (MAA), be made into by the 1:0.05:0.36:3.5 mol ratio that the aqueous solution is disposable to feed intake.Heating in water bath to 75 ℃, 4.5h drips initiator.Initiator is hydrogen peroxide, ammonium persulphate, Potassium Persulphate and azo-bis-isobutyl cyanide, and the mass ratio of hydrogen peroxide, ammonium persulphate, Potassium Persulphate, azo-bis-isobutyl cyanide is 1:1::1::1, and the total consumption of initiator accounts for 0.15% of the total system quality of reaction, reaction 1.5h.After reaction finishes, being cooled to room temperature, is that 30% sodium hydroxide solution adjusting pH value is 6.5 with massfraction.
Embodiment six
Polyester high performance water reducing agent of polyocarboxy acid and the accelerating component sodium sulfate of embodiment one preparation is composite, each constituent mass ratio is: the solid content of polyester polycarboxylate water-reducer: sodium sulfate: water is pressed each component of 6:2.0:92 proportion speed weighing, mixing shakes up, and namely gets the 1# concrete early strength agent.
Embodiment seven
Polyester high performance water reducing agent of polyocarboxy acid and the accelerating component sodium sulfate of embodiment one preparation is composite, each constituent mass ratio is: the solid content of polyester polycarboxylate water-reducer: sodium sulfate: water is pressed each component of 20:8:72 proportion speed weighing, mixing shakes up, and namely gets the 2# concrete early strength agent.
Embodiment eight
Polyester high performance water reducing agent of polyocarboxy acid and the accelerating component sodium sulfate of embodiment one preparation is composite, each constituent mass ratio is: the solid content of polyester polycarboxylate water-reducer: sodium sulfate: water is pressed each component of 10:4:86 proportion speed weighing, mixing shakes up, and namely gets the 3# concrete early strength agent.
Embodiment nine
Polyester high performance water reducing agent of polyocarboxy acid and the accelerating component trolamine of embodiment one preparation is composite, each constituent mass ratio is: the solid content of polyester polycarboxylate water-reducer: trolamine: water is pressed each component of 6:0.5:93.5 proportion speed weighing, mixing shakes up, and namely gets the 4# concrete early strength agent.
Embodiment ten
Polyester high performance water reducing agent of polyocarboxy acid and the accelerating component trolamine of embodiment one preparation is composite, each constituent mass ratio is: the solid content of polyester polycarboxylate water-reducer: sodium sulfate: water is pressed each component of 20:2.0:78 proportion speed weighing, mixing shakes up, and namely gets the 5# concrete early strength agent.
Embodiment 11
Polyester high performance water reducing agent of polyocarboxy acid and the accelerating component trolamine of embodiment one preparation is composite, each constituent mass ratio is: the solid content of polyester polycarboxylate water-reducer: sodium sulfate: water is pressed each component of 15:1.5:83.5 proportion speed weighing, mixing shakes up, and namely gets the 6# concrete early strength agent.
Embodiment 12
The polyester high performance water reducing agent of polyocarboxy acid of embodiment one preparation and accelerating component sodium sulfate and trolamine is composite, sodium sulfate and trolamine mass ratio are 1:5, each constituent mass ratio is: the solid content of polyester polycarboxylate water-reducer: accelerating component: water is pressed each component of 6:1.0:93 proportion speed weighing, mixing shakes up, and namely gets the 7# concrete early strength agent.
Embodiment 13
The polyester high performance water reducing agent of polyocarboxy acid of embodiment one preparation and accelerating component sodium sulfate and trolamine is composite, sodium sulfate and trolamine mass ratio are 1:20, each constituent mass ratio is: the solid content of polyester polycarboxylate water-reducer: accelerating component: water is pressed each component of 20:8.0:72 proportion speed weighing, mixing shakes up, and namely gets the 8# concrete early strength agent.
Embodiment 14
The polyester high performance water reducing agent of polyocarboxy acid of embodiment one preparation and accelerating component sodium sulfate and trolamine is composite, sodium sulfate and trolamine mass ratio are 1:15, each constituent mass ratio is: the solid content of polyester polycarboxylate water-reducer: accelerating component: water is pressed each component of 10:5.0:85 proportion speed weighing, mixing shakes up, and namely gets the 9# concrete early strength agent.
Embodiment 15
The polyester high performance water reducing agent of polyocarboxy acid that embodiment one is prepared adds in the concrete with 0.15% of concrete gel material quality by solid content, concrete proportioning is: cement: flyash: breeze: sand: stone: water=225:75:50:772:1066: 160, preparation C30 high performance concrete, blank group is not for adding the concrete of water reducer, concrete proportioning is: cement: flyash: breeze: sand: stone: water=300:105:70:680:945:218, the two preparation total amount is close.Concrete raw material is respectively: the foreign-style house board P.O42.5 cement that Yadong cement responsibility company limited produces, the Wuhan electric Industrial Co., Ltd. of China first level flour coal ash, S95 level breeze, 5～25 millimeters broken basalt of continuous grading, husky in the Ganjiang River of fineness modulus position 2.7～2.8.Test-results such as following table.
Embodiment 16
The 1# of embodiment 6 to embodiment 14 preparation～9# concrete early strength agent is added in the concrete preparation C30 concrete with 0.8～2.8% volume of concrete gel material quality.The blank group is the concrete performance behind the adding hardening accelerator for the concrete performance of the pure polyester water reducer of adding 0.15%, 1#～9#, carries out the contrast of flowability and strength property.Concrete proportioning is: cement: flyash: breeze: sand: stone: water=225:75:50:772:1066:160.Experimental result sees the following form.
Claims (6)
1. method for preparing the polyester polycarboxylate water-reducer, its processing step is:
(1) with monomethyl polyethylene glycol acrylate ester: methylpropene sodium sulfonate: methyl acrylate: methacrylic acid is made into by the mol ratio of 1: 0.038～0.16:0.24～0.48:2～4 that the aqueous solution is disposable to feed intake;
(2) heating in water bath to 65～90 ℃ dripped initiator in 1.5～5 hours, and the initiator quality accounts for 0.1～0.3% of the total system quality of reaction, dripped behind the initiator insulation reaction 0.5-3 hour;
(3) after reaction finishes, being cooled to room temperature, is that 30% sodium hydroxide solution adjusting pH of mixed is 6～8 with massfraction; Make the polyester polycarboxylate water-reducer.
2. method for preparing concrete early strength agent with polyester polycarboxylate water-reducer claimed in claim 1, its processing step is: the polyester polycarboxylate water-reducer of claim 1 preparation is mixed with accelerating component, water, the solid content of polyester polycarboxylate water-reducer: accelerating component: water mixes by the mass ratio of 6～20:0.5～8.0:72～93.5, namely makes concrete early strength agent.
3. the method for preparing concrete early strength agent as claimed in claim 2, it is characterized in that: described accelerating component is trolamine and sodium sulfate mixture, and trolamine: sodium sulfate mixes by the mass ratio of 1:5～20.
4. the method for preparing concrete early strength agent as claimed in claim 2, it is characterized in that: described accelerating component is sodium sulfate, the solid content of polyester polycarboxylate water-reducer: sodium sulfate: water mixes by the mass ratio of 6～20:2.0～8.0:72～92.
5. the method for preparing concrete early strength agent as claimed in claim 2, it is characterized in that: described accelerating component is trolamine, the solid content of polyester polycarboxylate water-reducer: trolamine: water mixes by the mass ratio of 6～20:0.5～2.0:78～93.5.
6. the constructional method of the described concrete early strength agent of claim 2, its processing step is: the concrete early strength agent of claim 2 preparation 0.8～2.8% volume with the concrete gel material total mass is added in the concrete, and stirring gets final product.
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| CN104030595A (en) * | 2014-04-30 | 2014-09-10 | 岳阳跃坤环保建材科技有限公司 | Compound concrete admixture with early strength and water reduction functions, and preparation method and application thereof |
| CN104861122A (en) * | 2015-04-22 | 2015-08-26 | 厦门路桥翔通建材科技有限公司 | Heat-source-free early strength polycarboxylate water reducer and preparation method thereof |
| CN104891851A (en) * | 2015-05-25 | 2015-09-09 | 重庆市建筑科学研究院 | High-strength concrete strength exciting agent and preparation method thereof |
| CN105198263A (en) * | 2015-11-01 | 2015-12-30 | 刘应才 | Preparation method of concrete early strength agent |
| CN105388946A (en) * | 2015-12-15 | 2016-03-09 | 德阳九鼎智远知识产权运营有限公司 | Intelligent control system and method for concrete early strength agent |
| CN105396527A (en) * | 2015-12-15 | 2016-03-16 | 德阳九鼎智远知识产权运营有限公司 | Preparation device for concrete early strength agent and intelligent control system |
| CN105924590A (en) * | 2016-04-26 | 2016-09-07 | 陕西德盛新能源有限公司 | Preparation method of polycarboxylate concrete water reducer |
| CN106565911A (en) * | 2016-11-11 | 2017-04-19 | 长安大学 | Preparing method for delayed coagulation carboxylic acid water reducer used for magnesium oxychloride cement |
| CN108516728A (en) * | 2018-05-02 | 2018-09-11 | 芜湖恒固混凝土材料有限公司 | A kind of preparation method of early strength water-reducing agent for salvaging |
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| CN104030595A (en) * | 2014-04-30 | 2014-09-10 | 岳阳跃坤环保建材科技有限公司 | Compound concrete admixture with early strength and water reduction functions, and preparation method and application thereof |
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| CN106565911A (en) * | 2016-11-11 | 2017-04-19 | 长安大学 | Preparing method for delayed coagulation carboxylic acid water reducer used for magnesium oxychloride cement |
| CN108516728A (en) * | 2018-05-02 | 2018-09-11 | 芜湖恒固混凝土材料有限公司 | A kind of preparation method of early strength water-reducing agent for salvaging |
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