CN105271911A - Alkali-free liquid accelerator and preparation method thereof - Google Patents

Abstract

The invention discloses an alkali-free liquid accelerator and a preparation method thereof. The accelerator comprises, by mass, 30-60 parts of aluminum sulfate, 5-10 parts of calcium formate, 1.0-3.5 parts of methyl cellulose, 0.8-1.5 parts of polyacrylamide, 0.2-1.0 part of an organic acid, 1-3 parts of triethanolamine, 0.15-1.08 parts of an antifoaming agent, 0.5-1.5 parts of phosphoric acid and 30-50 parts of water. The organic acid is citric acid or oxalic acid. The antifoaming agent is dimethicone or polypropylene glycol. The alkali-free liquid accelerator has the adv no alkali metal ions, no corrosive or pungent smell, stable quality, good adaptability, low dosage, fast setting speed and high strength. The accelerator allows cement to initially set within 2min and to finally set within 5min when the dosage is 1-3%, and has good storage stability at -10-45DEG C.

Description

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

Technical field

The invention belongs to technical field of concrete additives, be specifically related to a kind of alkali-free liquid accelerator and preparation method thereof.

Background technology

Accelerating chemicals is the admixture that cement concrete rapid coagulation is hardened.The main purpose mixing accelerating chemicals increases sprayed concrete jetting thickness, shortens the timed interval between spraying for 2 times, improves the early strength of sprayed concrete, to provide supporting drag in time.Since the thirties in last century starts to produce and use, accelerating chemicals rely on its rapid hardening, early strong in outstanding feature, now become one of sprayed concrete important composition material.Particularly along with underground works quantity and the increase of scale and the difference of effect, accelerating chemicals is as concrete composition material, not only quite important, and more seem indispensable in some specific engineering, be widely used in water conservancy, traffic, mining and part salvaging.Accelerating chemicals is of a great variety, according to character and the state of accelerating chemicals, roughly can be divided into the liquid 4 large classes of alkaline powdery, alkali-free powdery, alkali liquid and alkali-free.

There is following problem in alkalescence powdery and alkali liquid accelerating chemicals (being commonly referred to " traditional accelerating chemicals "): 1. later strength loss is large; 2. higher alkali content, causes the corrosion to workmen on the one hand, and infringement HUMAN HEALTH, also may cause alkali-aggregate reaction in concrete on the other hand, causes concrete strength and weather resistance to decline; 3. airborne dust is many, and springback capacity is large; 4. Wet-mix for Shotcrete operation etc. is not easy to.Although its alkali content of alkali-free powder accelerator is low, in construction process, ubiquity adds uneven and that dust is large problem.In recent years, high-alkali powder accelerator research and development and application proportion reduce gradually.Liquid the problems referred to above that effectively can overcome the high-alkali accelerating chemicals of powdery without (low) alkali Hardenfast (being commonly referred to " novel accelerating chemicals "), just progressively replace the high-alkali accelerating chemicals of conventional powdered.

External liquid quite extensive without the application of (low) alkali accelerating chemicals, especially there is alkaline accelerating chemicals hardly in the developed country such as Japanese, European.The domestic liquid investigation and application without (low) alkali accelerating chemicals was started to walk from phase late 1990s, due to the needs of its significant performance advantage and domestic sprayed concrete engineering development, development in recent years is rapid, as 8604 low alkali accelerating chemicalss of metallurgical construction research institute development, Beijing shaft building of China Coal Research Institute the MJ-2000 alkali-free quick-coagulant that develops; Organic-inorganic composite accelerating chemicals development aspect, once studied as the shaft building of China Coal Research Institute Beijing and subtracting of Xylo-Mucine was played the water reducer and inorganic setting accelerator compound that dustfall agent and inorganic setting accelerator compound, Chenguang Chemical Inst., Ministry of Chemical Industry's research used acrylamide-acrylicacid-acrylonitrile terpolymer to be main component.

Although the liquid nothing (low) of China is although alkali accelerating chemicals research tempo is very fast, engineer applied proportion also significantly improves, and still there are some problems, and the volume of such as accelerating chemicals concentrates between 3% ~ 12%, and relatively traditional volume about 2% is higher; Still there is certain unstable in the adaptability of part accelerating chemicals kind and different sorts cement, Additive and admixture; On the high side.

Summary of the invention

The object of this invention is to provide a kind of alkali-free liquid accelerator and preparation method thereof, this accelerating chemicals alkali-free metal ion, non-corrosiveness and irritating smell, steady 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 used in the present invention is:

A kind of alkali-free liquid accelerator, the mass fraction of component and each component is as follows: 30 ~ 60 parts, Tai-Ace S 150, calcium formiate 5 ~ 10 parts, methylcellulose gum 1.0 ~ 3.5 parts, polyacrylamide 0.8 ~ 1.5 part, organic acid 0.2 ~ 1.0 part, trolamine 1 ~ 3 part, defoamer 0.15 ~ 1.08 part, phosphoric acid 0.5 ~ 1.5 part, 30 ~ 50 parts, water.

Described organic acid is citric acid or oxalic acid.

Described defoamer is dimethyl silicone oil or polypropylene glycol.

The mass concentration of described phosphoric acid is 85%.

Described alkali-free liquid accelerator, the mass fraction of component and each component is preferably as follows: 40 ~ 50 parts, Tai-Ace S 150, calcium formiate 6 ~ 8 parts, methylcellulose gum 1.5 ~ 3.0 parts, polyacrylamide 1.0 ~ 1.3 parts, organic acid 0.4 ~ 0.8 part, trolamine 1.5 ~ 2.5 parts, defoamer 0.55 ~ 0.88 part, phosphoric acid 0.8 ~ 1.2 part, 35 ~ 45 parts, water.

Described alkali-free liquid accelerator, the mass fraction of component and each component is preferably as follows: 45 parts, Tai-Ace S 150, calcium formiate 7 parts, methylcellulose gum 2.2 parts, polyacrylamide 1.2 parts, organic acid 0.6 part, trolamine 2 parts, defoamer 0.64 part, phosphatase 11 .0 part, 40 parts, water.

The preparation method of described alkali-free liquid accelerator, comprises the steps:

1) Tai-Ace S 150, calcium formiate, organic acid and phosphoric acid are added to the water, heated and stirred, Heating temperature to 60 ~ 80 DEG C, mixing speed is 1200 ~ 2000rpm, stirs 10 ~ 20min;

2) mixing solutions that step 1) obtains is cooled to room temperature, adds remaining ingredient, stir, obtain alkali-free liquid accelerator.

Preferred steps 1) middle Heating temperature to 70 DEG C, mixing speed is 1500rpm, stirs 15min.

Beneficial effect:

Alkali-free liquid accelerator alkali-free metal ion provided by the invention, non-corrosiveness and irritating smell, steady quality, 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, accelerating chemicals provided by the invention can make cement initial set in 2min at volume 1% ~ 3%, final set in 5min; And under-10 DEG C ~ 45 DEG C conditions, there is good preservation stability.

Embodiment

Testing cement used in following examples is the Tiger Mountain .024.5 cement that Zhejiang Tiger Mountain group produces.The mass concentration of phosphoric acid is 85%.

Embodiment 1

A kind of alkali-free liquid accelerator, the mass fraction of component and each component is as follows: 30 ~ 60 parts, Tai-Ace S 150, calcium formiate 5 ~ 10 parts, methylcellulose gum 1.0 ~ 3.5 parts, polyacrylamide 0.8 ~ 1.5 part, citric acid 0.2 ~ 1.0 part, trolamine 1 ~ 3 part, polypropylene glycol 0.15 ~ 1.08 part, phosphoric acid 0.5 ~ 1.5 part, 30 ~ 50 parts, water.

Preparation method, comprises the steps:

1) Tai-Ace S 150, calcium formiate, organic acid and phosphoric acid are added to the water, heated and stirred, Heating temperature to 70 DEG C, mixing speed is 1500rpm, stirs 15min;

2) mixing solutions that step 1) obtains is cooled to room temperature, adds remaining ingredient, stir, obtain alkali-free liquid accelerator.

Embodiment 2

A kind of alkali-free liquid accelerator, the mass fraction of component and each component is as follows: 30 ~ 60 parts, Tai-Ace S 150, calcium formiate 5 ~ 10 parts, methylcellulose gum 1.0 ~ 3.5 parts, polyacrylamide 0.8 ~ 1.5 part, oxalic acid 0.2 ~ 1.0 part, trolamine 1 ~ 3 part, polypropylene glycol 0.15 ~ 1.08 part, phosphoric acid 0.5 ~ 1.5 part, 30 ~ 50 parts, water.

Preparation method, comprises the steps:

1) Tai-Ace S 150, calcium formiate, organic acid and phosphoric acid are added to the water, heated and stirred, Heating temperature to 70 DEG C, mixing speed is 1500rpm, stirs 15min;

2) mixing solutions that step 1) obtains is cooled to room temperature, adds remaining ingredient, stir, obtain alkali-free liquid accelerator.

Embodiment 3

A kind of alkali-free liquid accelerator, the mass fraction of component and each component is as follows: 40 ~ 50 parts, Tai-Ace S 150, calcium formiate 6 ~ 8 parts, methylcellulose gum 1.5 ~ 3.0 parts, polyacrylamide 1.0 ~ 1.3 parts, oxalic acid 0.4 ~ 0.8 part, trolamine 1.5 ~ 2.5 parts, defoamer dimethyl silicone oil 0.55 ~ 0.88 part, phosphoric acid 0.8 ~ 1.2 part, 35 ~ 45 parts, water.

Preparation method, comprises the steps:

1) Tai-Ace S 150, calcium formiate, organic acid and phosphoric acid are added to the water, heated and stirred, Heating temperature to 70 DEG C, mixing speed is 1500rpm, stirs 15min;

2) mixing solutions that step 1) obtains is cooled to room temperature, adds remaining ingredient, stir, obtain alkali-free liquid accelerator.

Embodiment 4

A kind of alkali-free liquid accelerator, the mass fraction of component and each component is as follows: 40 ~ 50 parts, Tai-Ace S 150, calcium formiate 6 ~ 8 parts, methylcellulose gum 1.5 ~ 3.0 parts, polyacrylamide 1.0 ~ 1.3 parts, citric acid 0.4 ~ 0.8 part, trolamine 1.5 ~ 2.5 parts, defoamer dimethyl silicone oil 0.55 ~ 0.88 part, phosphoric acid 0.8 ~ 1.2 part, 35 ~ 45 parts, water.

Preparation method, comprises the steps:

1) Tai-Ace S 150, calcium formiate, organic acid and phosphoric acid are added to the water, heated and stirred, Heating temperature to 70 DEG C, mixing speed is 1500rpm, stirs 15min;

2) mixing solutions that step 1) obtains is cooled to room temperature, adds remaining ingredient, stir, obtain alkali-free liquid accelerator.

Embodiment 5

A kind of alkali-free liquid accelerator, the mass fraction of component and each component is as follows: 45 parts, Tai-Ace S 150, calcium formiate 7 parts, methylcellulose gum 2.2 parts, polyacrylamide 1.2 parts, citric acid 0.6 part, trolamine 2 parts, defoamer dimethyl silicone oil 0.64 part, phosphatase 11 .0 part, 40 parts, water.

Preparation method, comprises the steps:

1) Tai-Ace S 150, calcium formiate, organic acid and phosphoric acid are added to the water, heated and stirred, Heating temperature to 70 DEG C, mixing speed is 1500rpm, stirs 15min;

2) mixing solutions that step 1) obtains is cooled to room temperature, adds remaining ingredient, stir, obtain alkali-free liquid accelerator.

Comparative example 1(comparative example 1 is only with the difference of embodiment 5, and do not add calcium formiate and methylcellulose gum in comparative example 1, all the other components and content thereof are with embodiment 5)

A kind of accelerating chemicals, the mass fraction of component and each component is as follows: 45 parts, Tai-Ace S 150, polyacrylamide 1.2 parts, citric acid 0.6 part, trolamine 2 parts, defoamer dimethyl silicone oil 0.64 part, phosphatase 11 .0 part, 40 parts, water.

Comparative example 2(comparative example 2 is only with the difference of embodiment 5, and do not add polyacrylamide in comparative example 2, all the other components and content thereof are with embodiment 5)

A kind of accelerating chemicals, the mass fraction of component and each component is as follows: 45 parts, Tai-Ace S 150, calcium formiate 7 parts, methylcellulose gum 2.2 parts, citric acid 0.6 part, trolamine 2 parts, defoamer dimethyl silicone oil 0.64 part, phosphatase 11 .0 part, 40 parts, water.

Comparative example 3(comparative example 3 is only with the difference of embodiment 5, and do not add citric acid and phosphoric acid in comparative example 3, all the other components and content thereof are with embodiment 5)

A kind of accelerating chemicals, the mass fraction of component and each component is as follows: 45 parts, Tai-Ace S 150, calcium formiate 7 parts, methylcellulose gum 2.2 parts, polyacrylamide 1.2 parts, trolamine 2 parts, defoamer dimethyl silicone oil 0.64 part, 40 parts, water.

Mixed by 2% volume and cement by the accelerating chemicals of embodiment 1 ~ 5 and comparative example 1 ~ 3, investigation time of coagulation and 1 day 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

The accelerating chemicals of embodiment 5 is pressed different addition quantity and cement mixes, investigate time of coagulation 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 (8)

1. an alkali-free liquid accelerator, it is characterized in that, the mass fraction of component and each component is as follows: 30 ~ 60 parts, Tai-Ace S 150, calcium formiate 5 ~ 10 parts, methylcellulose gum 1.0 ~ 3.5 parts, polyacrylamide 0.8 ~ 1.5 part, organic acid 0.2 ~ 1.0 part, trolamine 1 ~ 3 part, defoamer 0.15 ~ 1.08 part, phosphoric acid 0.5 ~ 1.5 part, 30 ~ 50 parts, water.

2. alkali-free liquid accelerator according to claim 1, is characterized in that, described organic acid is citric acid or oxalic acid.

3. alkali-free liquid accelerator according to claim 1, is characterized in that, described defoamer is dimethyl silicone oil or polypropylene glycol.

4. alkali-free liquid accelerator according to claim 1, is characterized in that, the mass concentration of described phosphoric acid is 85%.

5. alkali-free liquid accelerator according to claim 1, it is characterized in that, the mass fraction of component and each component is as follows: 40 ~ 50 parts, Tai-Ace S 150, calcium formiate 6 ~ 8 parts, methylcellulose gum 1.5 ~ 3.0 parts, polyacrylamide 1.0 ~ 1.3 parts, organic acid 0.4 ~ 0.8 part, trolamine 1.5 ~ 2.5 parts, defoamer 0.55 ~ 0.88 part, phosphoric acid 0.8 ~ 1.2 part, 35 ~ 45 parts, water.

6. alkali-free liquid accelerator according to claim 5, it is characterized in that, the mass fraction of component and each component is as follows: 45 parts, Tai-Ace S 150, calcium formiate 7 parts, methylcellulose gum 2.2 parts, polyacrylamide 1.2 parts, organic acid 0.6 part, trolamine 2 parts, defoamer 0.64 part, phosphatase 11 .0 part, 40 parts, water.

7. the preparation method of alkali-free liquid accelerator described in any one in claim 1 ~ 6, is characterized in that, comprise the steps:

1) Tai-Ace S 150, calcium formiate, organic acid and phosphoric acid are added to the water, heated and stirred, Heating temperature to 60 ~ 80 DEG C, mixing speed is 1200 ~ 2000rpm, stirs 10 ~ 20min;

2) mixing solutions that step 1) obtains is cooled to room temperature, adds remaining ingredient, stir, obtain alkali-free liquid accelerator.

8. the preparation method of alkali-free liquid accelerator according to claim 7, is characterized in that, step 1) middle Heating temperature to 70 DEG C, mixing speed is 1500rpm, stirs 15min.