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, in particular to a cement concrete antifreeze agent. 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 protective measures are mainly taken. One is to use covering or enclosure heating methods to prevent the concrete temperature from dropping below 0°C. This method is costly and complicated to operate; The second is to add antifreeze to the concrete. This method is simple in construction and good in effect, so it has been widely used in our country.

[0003] So far, the pumping antifreeze used in construction projects at home and abroad are all formulated with water-reducing components, compounded with early-strength components, antifreeze components and air-entraining components. The water-reducing components include naphthalene sulfonate formaldehyde condensate ...

Examples

Embodiment 1

[0015] First, prepare polycarboxylate water reducer: deionized water for production, 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 reaction kettle, raise the temperature to 60-70°C, add hydrogen peroxide with a mass concentration of 35%, and stir. The weight ratio of the hydrogen peroxide to polyallyl alcohol 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, polyallyl alcohol methoxy macromonomer ether is 0.001-0.0012:0:003-0.0035: 1. The initiator is mercaptoacetic acid and mercaptopropionic acid with a weight ratio of 1:1. Add dropwise for 3 hours, keep warm for 3 hours, and after cooling to 40-50°C, add 30% sodium hydroxide solution , until the weight concentration of polyallyl alcohol methoxy macromonomer ether is 35%, a polycarboxylate water reducer is prepared.

[...

Embodiment 2

[0019] The preparation method of the polycarboxylate high-performance water reducer is the same as in Example 1.

[0020] Weigh 30 parts by weight of polycarboxylate high-performance water reducer, 25 parts by weight of ethylene glycol, 0.1 part by weight of triterpene saponin, 10 parts by weight of calcium formate and 5 parts by weight of triisopropanolamine, mix well, and stir for 0.5 hours , add 50 parts by weight of water, and stir for 20 minutes.

[0021] The antifreeze of this embodiment was tested for performance, and the results are shown in Table 1.

Embodiment 3

[0023] The preparation method of the polycarboxylate high-performance water reducer is the same as in Example 1.

[0024] Weigh 25 parts by weight of polycarboxylate high-performance water reducer, 30 parts by weight of glycerin, 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 then add 70 parts by weight portion of water and stir for 10 minutes.

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

[0026] The antifreeze of this embodiment was tested for performance, and the results are shown in Table 1.

[0027] Table 1 Test results of antifreeze performance

[0028] Test items Specified indicators (JC475-2004) Commercially available products Example 1 Example 2 Example 3 Ammonia release ≤0.05 0～10 0 0 0 Chloride content Production factory control ± 2% 10～20 ≤0.01 ≤0.01 ≤0.01 Alkali content Production factory co...

technical field

[0001] The invention belongs to the technical field of building materials, in particular to a cement concrete antifreeze agent. 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 protective measures are mainly taken. One is to use covering or enclosure heating methods to prevent the concrete temperature from dropping below 0°C. This method is costly and complicated to operate; The second is to add antifreeze to the concrete. This method is simple in construction and good in effect, so it has been widely used in our country.

[0003] So far, the pumping antifreeze used in construction projects at home and abroad are all formulated with water-reducing components, compounded with early-strength components, antifreeze components and air-entraining components. The water-reducing components include naphthalene sulfonate formaldehyde condensate ...

Examples

Embodiment 1

[0015] First, prepare polycarboxylate water reducer: deionized water for production, 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 reaction kettle, raise the temperature to 60-70°C, add hydrogen peroxide with a mass concentration of 35%, and stir. The weight ratio of the hydrogen peroxide to polyallyl alcohol 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, polyallyl alcohol methoxy macromonomer ether is 0.001-0.0012:0:003-0.0035: 1. The initiator is mercaptoacetic acid and mercaptopropionic acid with a weight ratio of 1:1. Add dropwise for 3 hours, keep warm for 3 hours, and after cooling to 40-50°C, add 30% sodium hydroxide solution , until the weight concentration of polyallyl alcohol methoxy macromonomer ether is 35%, a polycarboxylate water reducer is prepared.

[...

Embodiment 2

[0019] The preparation method of the polycarboxylate high-performance water reducer is the same as in Example 1.

[0020] Weigh 30 parts by weight of polycarboxylate high-performance water reducer, 25 parts by weight of ethylene glycol, 0.1 part by weight of triterpene saponin, 10 parts by weight of calcium formate and 5 parts by weight of triisopropanolamine, mix well, and stir for 0.5 hours , add 50 parts by weight of water, and stir for 20 minutes.

[0021] The antifreeze of this embodiment was tested for performance, and the results are shown in Table 1.

Embodiment 3

[0023] The preparation method of the polycarboxylate high-performance water reducer is the same as in Example 1.

[0024] Weigh 25 parts by weight of polycarboxylate high-performance water reducer, 30 parts by weight of glycerin, 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 then add 70 parts by weight portion of water and stir for 10 minutes.

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

[0026] The antifreeze of this embodiment was tested for performance, and the results are shown in Table 1.

[0027] Table 1 Test results of antifreeze performance

[0028] Test items Specified indicators (JC475-2004) Commercially available products Example 1 Example 2 Example 3 Ammonia release ≤0.05 0～10 0 0 0 Chloride content Production factory control ± 2% 10～20 ≤0.01 ≤0.01 ≤0.01 Alkali content Production factory co...