CN105271911B - A kind of alkali-free liquid accelerator and preparation method thereof - Google Patents

A kind of alkali-free liquid accelerator and preparation method thereof Download PDF

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CN105271911B
CN105271911B CN201510637362.6A CN201510637362A CN105271911B CN 105271911 B CN105271911 B CN 105271911B CN 201510637362 A CN201510637362 A CN 201510637362A CN 105271911 B CN105271911 B CN 105271911B
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parts
alkali
accelerator
free liquid
component
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CN105271911A (en
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许冬娣
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Shaoguan Qujiang Feng Ze Concrete Co., Ltd.
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Shaoguan Qujiang Feng Ze Concrete Co Ltd
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Abstract

The invention discloses a kind of alkali-free liquid accelerator and preparation method thereof, the mass fraction of accelerator component and each component is as follows:30~60 parts of aluminum sulfate, 5~10 parts of calcium formate, 1.0~3.5 parts of methylcellulose, 0.8~1.5 part of polyacrylamide, 0.2~1.0 part of organic acid, 1~3 part of triethanolamine, 0.15~1.08 part of antifoaming agent, 0.5~1.5 part of phosphoric acid, 30~50 parts of water.The organic acid is citric acid or ethanedioic acid.The antifoaming agent is dimethicone or polypropylene glycol.The alkali-free liquid accelerator of the present invention is without alkali metal ion, and non-corrosive and penetrating odor, stable quality, adaptability is good, and volume is low, and rate of set is fast and intensity is high.In volume 1%~3% cement can be made pre-hardening in 2min, the final set in 5min;And there is good storage stability under the conditions of 10 DEG C~45 DEG C.

Description

A kind of alkali-free liquid accelerator and preparation method thereof
Technical field
The invention belongs to technical field of concrete additives, and in particular to a kind of alkali-free liquid accelerator and its preparation side Method.
Background technology
Accelerator is the additive for hardening cement concrete rapid condensation.The main purpose for mixing accelerator is to increase spray Jetting thickness of concrete is penetrated, shortens the time interval between spraying 2 times, improves the early strength of gunite concrete, so as to Supporting drag is provided in time.Since the 30's of last century since production and use, accelerator is by it in rapid hardening, early strong side Face outstanding feature has become one of gunite concrete important composition material.In particular with underground engineering quantity and rule The difference of increase and the effect of mould, composition material of the accelerator as concrete is not only quite important, but also some specific Engineering more seems indispensable, is widely used in water conservancy, traffic, mining and part and salvages.Accelerator species is various, root According to the property and state of accelerator, it can substantially be divided into alkaline powdery, 4 major class of alkali-free powdery, alkali liquid and alkali-free liquid.
There are following problems for alkaline powdery and alkali liquid accelerator (commonly referred to as " traditional accelerator "): ① Later strength loss is big;2. on the one hand higher alkali content causes the corrosion to construction personnel, health, the opposing party are damaged Face may also cause alkali-aggregate reaction in concrete, and concrete strength and durability is caused to decline;3. airborne dust is more, springback capacity is big; 4. it is not easy to Wet-mix for Shotcrete operation etc..It is universal in the construction process although its alkali content of alkali-free powder accelerator is low In the presence of adding the problem of uneven and dust is big.In recent years, high-alkali powder accelerator is researched and developed and gradually decreased using proportion.Liquid (commonly referred to as " new accelerator ") it can effectively overcome the above-mentioned of the high-alkali accelerator of powdery without (low) alkali concrete accelerator Problem just progressively substitutes the high-alkali accelerator of conventional powdered.
External liquid is quite extensive without the application of (low) alkali accelerator, especially in developed countries such as Japan, Europe It there's almost no alkaline accelerator.Research and application of the domestic liquid without (low) alkali accelerator are from the 90's Mos of 20th century Phase starting, due to its significant performance advantage and the needs of domestic gunite concrete engineering development, quickly grow in recent years, such as The MJ- that Beijing shaft building for the 8604 low alkali accelerators, China Coal Research Institute that metallurgical construction research institute develops is developed 2000 alkali-free quick-coagulants;In terms of the development of organic-inorganic composite accelerator, such as China Coal Research Institute Beijing shaft building institute once It studied and subtracting for sodium carboxymethylcellulose is played that dustfall agent and inorganic setting accelerator are compound, Chenguang Chemical Inst., Ministry of Chemical Industry is studied makes Used acrylamide and acrylic acid-acrylonitrile terpolymer water-reducing agent as main component and inorganic setting accelerator are compound.
Without (low) although alkali accelerator studies development speed quickly, although engineer application proportion also significantly carries China's liquid Height, but there are still some problems, for example the volume of accelerator is concentrated between 3%~12%, relatively traditional volume 2% or so It is higher;There are still certain unstable for the adaptability of part accelerator kind and variety classes cement, admixture and additive Property;It is on the high side.
The content of the invention
The object of the present invention is to provide a kind of alkali-free liquid accelerator and preparation method thereof, the accelerator not alkali metal containing from Son, non-corrosive and penetrating odor, stable quality, adaptability is good, and volume is low, and rate of set is fast and intensity is high.
To achieve these goals, the technical solution adopted by the present invention is:
The mass fraction of a kind of alkali-free liquid accelerator, component and each component is as follows:30~60 parts of aluminum sulfate, calcium formate 5 ~10 parts, 1.0~3.5 parts of methylcellulose, 0.8~1.5 part of polyacrylamide, 0.2~1.0 part of organic acid, triethanolamine 1~3 part, 0.15~1.08 part of antifoaming agent, 0.5~1.5 part of phosphoric acid, 30~50 parts of water.
The organic acid is citric acid or ethanedioic acid.
The antifoaming agent is dimethicone or polypropylene glycol.
The mass concentration of the phosphoric acid is 85%.
The mass fraction of the alkali-free liquid accelerator, component and each component is preferably as follows:40~50 parts of aluminum sulfate, first Sour 6~8 parts of calcium, 1.5~3.0 parts of methylcellulose, 1.0~1.3 parts of polyacrylamide, 0.4~0.8 part of organic acid, three second 1.5~2.5 parts of hydramine, 0.55~0.88 part of antifoaming agent, 0.8~1.2 part of phosphoric acid, 35~45 parts of water.
The mass fraction of the alkali-free liquid accelerator, component and each component is preferably as follows:45 parts of aluminum sulfate, calcium formate 7 parts, 2.2 parts of methylcellulose, 1.2 parts of polyacrylamide, 0.6 part of organic acid, 2 parts of triethanolamine, 0.64 part of antifoaming agent, .0 parts of phosphatase 11,40 parts of water.
The preparation method of the alkali-free liquid accelerator, includes the following steps:
1)Aluminum sulfate, calcium formate, organic acid and phosphoric acid are added to the water, heating stirring, heating temperature to 60~80 DEG C, Speed of agitator is 1200~2000rpm, stirs 10~20min;
2)By step 1)Obtained mixed solution is cooled to room temperature, and is added in remaining ingredient, is stirred evenly, obtain alkali-free liquid Accelerator.
Preferred steps 1) in heating temperature to 70 DEG C, speed of agitator 1500rpm, stir 15min.
Advantageous effect:
Alkali-free liquid accelerator provided by the invention is free of alkali metal ion, and non-corrosive and penetrating odor, quality is steady Fixed, adaptability is good, and volume is low, and rate of set is fast and intensity is high.According to the experiment condition of JC477-2005, speed provided by the invention Solidifying agent can make cement pre-hardening in 2min in volume 1%~3%, the final set in 5min;And have under the conditions of -10 DEG C~45 DEG C There is good storage stability.
Specific embodiment
Cement used in experiment is the Tiger Mountain .024.5 cement of Zhejiang Tiger Mountain group production in following embodiment.The quality of phosphoric acid Concentration is 85%.
Embodiment 1
The mass fraction of a kind of alkali-free liquid accelerator, component and each component is as follows:30~60 parts of aluminum sulfate, calcium formate 5 ~10 parts, 1.0~3.5 parts of methylcellulose, 0.8~1.5 part of polyacrylamide, 0.2~1.0 part of citric acid, triethanolamine 1~3 part, 0.15~1.08 part of polypropylene glycol, 0.5~1.5 part of phosphoric acid, 30~50 parts of water.
Preparation method includes the following steps:
1)Aluminum sulfate, calcium formate, organic acid and phosphoric acid are added to the water, heating stirring, heating temperature is to 70 DEG C, stirring Rotating speed is 1500rpm, stirs 15min;
2)By step 1)Obtained mixed solution is cooled to room temperature, and is added in remaining ingredient, is stirred evenly, obtain alkali-free liquid Accelerator.
Embodiment 2
The mass fraction of a kind of alkali-free liquid accelerator, component and each component is as follows:30~60 parts of aluminum sulfate, calcium formate 5 ~10 parts, 1.0~3.5 parts of methylcellulose, 0.8~1.5 part of polyacrylamide, 0.2~1.0 part of ethanedioic acid, triethanolamine 1~3 part, 0.15~1.08 part of polypropylene glycol, 0.5~1.5 part of phosphoric acid, 30~50 parts of water.
Preparation method includes the following steps:
1)Aluminum sulfate, calcium formate, organic acid and phosphoric acid are added to the water, heating stirring, heating temperature is to 70 DEG C, stirring Rotating speed is 1500rpm, stirs 15min;
2)By step 1)Obtained mixed solution is cooled to room temperature, and is added in remaining ingredient, is stirred evenly, obtain alkali-free liquid Accelerator.
Embodiment 3
The mass fraction of a kind of alkali-free liquid accelerator, component and each component is as follows:40~50 parts of aluminum sulfate, calcium formate 6 ~8 parts, 1.5~3.0 parts of methylcellulose, 1.0~1.3 parts of polyacrylamide, 0.4~0.8 part of ethanedioic acid, triethanolamine 1.5~2.5 parts, 0.55~0.88 part of antifoaming agent dimethicone, 0.8~1.2 part of phosphoric acid, 35~45 parts of water.
Preparation method includes the following steps:
1)Aluminum sulfate, calcium formate, organic acid and phosphoric acid are added to the water, heating stirring, heating temperature is to 70 DEG C, stirring Rotating speed is 1500rpm, stirs 15min;
2)By step 1)Obtained mixed solution is cooled to room temperature, and is added in remaining ingredient, is stirred evenly, obtain alkali-free liquid Accelerator.
Embodiment 4
The mass fraction of a kind of alkali-free liquid accelerator, component and each component is as follows:40~50 parts of aluminum sulfate, calcium formate 6 ~8 parts, 1.5~3.0 parts of methylcellulose, 1.0~1.3 parts of polyacrylamide, 0.4~0.8 part of citric acid, triethanolamine 1.5~2.5 parts, 0.55~0.88 part of antifoaming agent dimethicone, 0.8~1.2 part of phosphoric acid, 35~45 parts of water.
Preparation method includes the following steps:
1)Aluminum sulfate, calcium formate, organic acid and phosphoric acid are added to the water, heating stirring, heating temperature is to 70 DEG C, stirring Rotating speed is 1500rpm, stirs 15min;
2)By step 1)Obtained mixed solution is cooled to room temperature, and is added in remaining ingredient, is stirred evenly, obtain alkali-free liquid Accelerator.
Embodiment 5
The mass fraction of a kind of alkali-free liquid accelerator, component and each component is as follows:45 parts of aluminum sulfate, 7 parts of calcium formate, 2.2 parts of methylcellulose, 1.2 parts of polyacrylamide, 0.6 part of citric acid, 2 parts of triethanolamine, antifoaming agent dimethicone 0.64 part .0 parts of phosphatase 11,40 parts of water.
Preparation method includes the following steps:
1)Aluminum sulfate, calcium formate, organic acid and phosphoric acid are added to the water, heating stirring, heating temperature is to 70 DEG C, stirring Rotating speed is 1500rpm, stirs 15min;
2)By step 1)Obtained mixed solution is cooled to room temperature, and is added in remaining ingredient, is stirred evenly, obtain alkali-free liquid Accelerator.
Comparative example 1(Comparative example 1 and the difference of embodiment 5 are only that, calcium formate and Methyl cellulose are not added in comparative example 1 Element, remaining component and its content are the same as embodiment 5)
The mass fraction of a kind of accelerator, component and each component is as follows:45 parts of aluminum sulfate, 1.2 parts of polyacrylamide, lemon 0.6 part of lemon acid, 2 parts of triethanolamine, 0.64 part of antifoaming agent dimethicone .0 parts of phosphatase 11,40 parts of water.
Comparative example 2(Comparative example 2 and the difference of embodiment 5 are only that, polyacrylamide is not added in comparative example 2, remaining group Divide and its content is the same as embodiment 5)
The mass fraction of a kind of accelerator, component and each component is as follows:45 parts of aluminum sulfate, 7 parts of calcium formate, Methyl cellulose 2.2 parts of element, 0.6 part of citric acid, 2 parts of triethanolamine, 0.64 part of antifoaming agent dimethicone .0 parts of phosphatase 11, water 40 Part.
Comparative example 3(Comparative example 3 and the difference of embodiment 5 are only that, citric acid and phosphoric acid are not added in comparative example 3, remaining Component and its content are the same as embodiment 5)
The mass fraction of a kind of accelerator, component and each component is as follows:45 parts of aluminum sulfate, 7 parts of calcium formate, Methyl cellulose 2.2 parts of element, 1.2 parts of polyacrylamide, 2 parts of triethanolamine, 0.64 part of antifoaming agent dimethicone, 40 parts of water.
By the accelerator of Examples 1 to 5 and comparative example 1~3 by 2% volume and cement mixing, setting time and 1 day are investigated Intensity and 28 days intensity, the results are shown in Table 1.
Table 1:
Group Presetting period Final setting time 1 day intensity/MPa 28 days intensity/MPa
Blank 175min 220min -- 53.89
Embodiment 1 3min10s 5min40s 18.9 45.87
Embodiment 2 2min52s 5min26s 20.1 46.98
Embodiment 3 2min44s 4min15s 23.8 48.90
Embodiment 4 2min17s 4min3s 6.42 47.68
Embodiment 5 1min15s 3min8s 25.3 53.34
Comparative example 1 8min19s 16min26s 10.57 33.28
Comparative example 2 7min48s 15min40s 13.26 34.75
Comparative example 3 8min40s 17min9s 12.81 32.61
By the accelerator of embodiment 5 by different addition quantity and cement mixing, investigation setting time is shown in Table 2.
Table 2:
Group 0.5% 1% 1.5% 2% 2.5% 3%
Presetting period 3min50s 2min10s 1min46s 1min15s 1min5s 1min0s
Final setting time 8min10s 5min55s 5min15s 3min8s 3min0s 2min45s

Claims (1)

1. a kind of alkali-free liquid accelerator, which is characterized in that the mass fraction of component and each component is as follows:
45 parts of aluminum sulfate, 7 parts of calcium formate, 2.2 parts of methylcellulose, 1.2 parts of polyacrylamide, 0.6 part of citric acid, triethanolamine 2 parts, 0.64 part of antifoaming agent dimethicone .0 parts of phosphatase 11,40 parts of water;
The alkali-free liquid accelerator preparation method, includes the following steps:
1)Aluminum sulfate, calcium formate, citric acid and phosphoric acid are added to the water, heating stirring, heating temperature is to 70 DEG C, speed of agitator For 1500rpm, 15min is stirred;
2)By step 1)Obtained mixed solution is cooled to room temperature, and is added in remaining ingredient, is stirred evenly, obtain alkali-free liquid rapid hardening Agent.
CN201510637362.6A 2015-10-06 2015-10-06 A kind of alkali-free liquid accelerator and preparation method thereof Active CN105271911B (en)

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