Cement concrete antifreezer

Abstract

The invention discloses a cement concrete antifreezer, which comprises the following components in part by weight: 15 to 30 parts of high-performance polycarboxylate water reducer, 20 to 30 parts of low molecular weight alcohol, 0.1 to 0.15 part of triterpenoid saponins, 10 to 30 parts of calcium formate, 2 to 5 parts of organic alkylol amine and 50 to 70 parts of water, wherein the triterpenoid saponins is used for entraining air to form a large number of superfine air bubbles and improve the frost heaving stress of concrete. By the cement concrete antifreezer, the concrete can be subjected to construction at the temperature of between -20 and -30 DEG C.

Description

Technical field

[0001] The invention belongs to the technical field of building materials, and specifically relates to a cement concrete antifreeze. Background technique

[0002] In winter construction in northern my country, in order to ensure the quality of the project and prevent concrete from freezing damage, two main protective measures are adopted. One is to use covering or enclosure heating methods to prevent the concrete temperature from falling below 0°C, which is costly and complex; The second is to add antifreeze to the concrete. This method is simple to construct and has good effects, so it has been widely used in my country.

[0003] So far, the pumping antifreezes used in construction projects at home and abroad are all formulated with a combination of water reducing, and then a combination of early strength components, antifreeze components and air-entraining components. Among them, water reducing components include naphthalenesulfonate formaldehyde condensate (napht...

Examples

Embodiment 1

[0015] First, prepare polycarboxylic acid water reducing agent: deionized water, polyallyl alcohol methoxy macromonomer ether and maleic anhydride (the weight ratio of the three is 0.7~0.85:1:0.2~0.4) Put it into the reactor, heat up to 60-70°C, add hydrogen peroxide with a mass concentration of 35%, and stir, the weight ratio of the hydrogen peroxide to the polyallyl methoxy macromonomer ether is 0.0007-0.001:1; To 75-85°C, add potassium persulfate and initiator solution dropwise, the weight ratio of potassium persulfate, initiator, and polyallyl alcohol methoxy macromonomer ether is 0.001~0.0012:0:003~0.0035: 1. The initiator is thioglycolic acid and mercaptopropionic acid in a weight ratio of 1:1, dripped for 3 hours, keep for 3 hours, cool to 40-50℃, add 30% sodium hydroxide solution by mass concentration , The weight concentration of the polyallyl alcohol methoxy macromonomer ether is 35%, and the polycarboxylic acid water reducing agent is prepared.

[0016] Weigh 15 parts...

Embodiment 2

[0019] The preparation method of the polycarboxylic acid high-performance water-reducing agent is the same as in Example 1.

[0020] Weigh 30 parts by weight of polycarboxylic acid high-performance water reducing agent, 25 parts by weight of ethylene glycol, 0.1 parts by weight of triterpene saponins, 10 parts by weight of calcium formate, and 5 parts by weight of triisopropanolamine, mix them evenly, and stir for 0.5h. , Add 50 parts by weight of water and stir for 20 minutes.

[0021] The performance test of the antifreeze of this embodiment is performed, and the results are shown in Table 1.

Embodiment 3

[0023] The preparation method of the polycarboxylic acid high-performance water-reducing agent is the same as in Example 1.

[0024] Weigh 25 parts by weight of polycarboxylic acid high-performance water reducing agent, 30 parts by weight of glycerol, 0.12 parts by weight of triterpene saponins, 30 parts by weight of calcium formate, and 4 parts by weight of triethanolamine, mix well, stir for 1 hour, and add 70 parts by weight Part of the water, stir for 10 minutes.

[0025] The glycerol can also be replaced with 1,2-propanediol.

[0026] The performance test of the antifreeze of this embodiment is performed, and the results are shown in Table 1.

[0027] Table 1 Antifreeze performance test results

[0028] Test items

Regulations (JC475-2004)

Commercial products

Example 1

Example 2

Example 3

Ammonia release

≤0.05

0~10

0

0

0

[0029] Chloride ion content

Factory control ±2%

10~20

≤0.01

≤0.01

≤0.01

Alkali content

Factory control ±2%

≥15

≤0.7

≤0.8

≤0.7

Whether there is cry...

Technical field

[0001] The invention belongs to the technical field of building materials, and specifically relates to a cement concrete antifreeze. Background technique

[0002] In winter construction in northern my country, in order to ensure the quality of the project and prevent concrete from freezing damage, two main protective measures are adopted. One is to use covering or enclosure heating methods to prevent the concrete temperature from falling below 0°C, which is costly and complex; The second is to add antifreeze to the concrete. This method is simple to construct and has good effects, so it has been widely used in my country.

[0003] So far, the pumping antifreezes used in construction projects at home and abroad are all formulated with a combination of water reducing, and then a combination of early strength components, antifreeze components and air-entraining components. Among them, water reducing components include naphthalenesulfonate formaldehyde condensate (napht...

Examples

Embodiment 1

[0015] First, prepare polycarboxylic acid water reducing agent: deionized water, polyallyl alcohol methoxy macromonomer ether and maleic anhydride (the weight ratio of the three is 0.7~0.85:1:0.2~0.4) Put it into the reactor, heat up to 60-70°C, add hydrogen peroxide with a mass concentration of 35%, and stir, the weight ratio of the hydrogen peroxide to the polyallyl methoxy macromonomer ether is 0.0007-0.001:1; To 75-85°C, add potassium persulfate and initiator solution dropwise, the weight ratio of potassium persulfate, initiator, and polyallyl alcohol methoxy macromonomer ether is 0.001~0.0012:0:003~0.0035: 1. The initiator is thioglycolic acid and mercaptopropionic acid in a weight ratio of 1:1, dripped for 3 hours, keep for 3 hours, cool to 40-50℃, add 30% sodium hydroxide solution by mass concentration , The weight concentration of the polyallyl alcohol methoxy macromonomer ether is 35%, and the polycarboxylic acid water reducing agent is prepared.

[0016] Weigh 15 parts...

Embodiment 2

[0019] The preparation method of the polycarboxylic acid high-performance water-reducing agent is the same as in Example 1.

[0020] Weigh 30 parts by weight of polycarboxylic acid high-performance water reducing agent, 25 parts by weight of ethylene glycol, 0.1 parts by weight of triterpene saponins, 10 parts by weight of calcium formate, and 5 parts by weight of triisopropanolamine, mix them evenly, and stir for 0.5h. , Add 50 parts by weight of water and stir for 20 minutes.

[0021] The performance test of the antifreeze of this embodiment is performed, and the results are shown in Table 1.

Embodiment 3

[0023] The preparation method of the polycarboxylic acid high-performance water-reducing agent is the same as in Example 1.

[0024] Weigh 25 parts by weight of polycarboxylic acid high-performance water reducing agent, 30 parts by weight of glycerol, 0.12 parts by weight of triterpene saponins, 30 parts by weight of calcium formate, and 4 parts by weight of triethanolamine, mix well, stir for 1 hour, and add 70 parts by weight Part of the water, stir for 10 minutes.

[0025] The glycerol can also be replaced with 1,2-propanediol.

[0026] The performance test of the antifreeze of this embodiment is performed, and the results are shown in Table 1.

[0027] Table 1 Antifreeze performance test results

[0028] Test items

Regulations (JC475-2004)

Commercial products

Example 1

Example 2

Example 3

Ammonia release

≤0.05

0~10

0

0

0

[0029] Chloride ion content

Factory control ±2%

10~20

≤0.01

≤0.01

≤0.01

Alkali content

Factory control ±2%

≥15

≤0.7

≤0.8

≤0.7

Whether there is cry...