A kind of preparation method and application of calcium carbide slag super early strength admixture

Abstract

The invention discloses a preparation method and application of a calcium carbide slag super early strength admixture. The preparation method comprises: (1) taking 20-60 parts by mass of carbide slag and 0.5-1 part by mass of a dispersant, adding 80-160 parts by mass (2) Add grinding aid with a solid content of calcium carbide slag of 0.5‰ to 1.5‰ in the calcium carbide slag slurry, and calcium carbide slag solid content in the calcium carbide slag slurry. The plasticizer with a content of 5-25‰ and 300-400 parts by mass of grinding medium are ground in a wet mill, and the grinding medium is screened to obtain calcium carbide slag ultra-fine slurry; (3) Add anti-agglomeration to the calcium carbide slag ultra-fine slurry to stabilize The agent is stirred to obtain calcium carbide slag super early strength admixture. The method of the invention has the advantages of simple process, low energy consumption and low cost. The prepared calcium carbide slag super-early strength admixture is added to the cement cementitious material, which can significantly enhance the early strength of the cement cementitious material, and the strength does not shrink in the later stage, thereby increasing the calcium carbide slag product. added value.

Description

technical field

[0001] The invention belongs to the technical field of building materials, and particularly relates to a preparation method and application of a calcium carbide slag super-early strength admixture. Background technique

[0002] With the development of my country's construction industry, early-strength concrete plays an increasingly important role in the fields of emergency repair and construction, production of concrete prefabricated components, and road and bridge construction. In order to improve the early strength of concrete, the methods commonly used are as follows:

[0003] (1) Curing concrete with steam at 60℃~80℃ for 8h, although this method can effectively shorten the demoulding time, but the steam curing energy consumption is large, which increases the production cost of precast concrete components, and the crystal growth of hydration products is coarse, which is not suitable for The durability of concrete elements is very disadvantageous. [0004...

Examples

preparation example Construction

[0035] The specific embodiment of the preparation method of the calcium carbide slag ultra-early strength admixture of the present invention will be provided below. In this specific embodiment, the carbide slag used is from each calcium carbide method for producing acetylene, and the wet mill used is a vertical planetary ball mill, including steps:

[0036] (1) Take 20-60 parts by mass of carbide slag and 0.5-1 part by mass of dispersant, add 80-160 parts by mass of water, mix and stir, and sieve to obtain calcium carbide slag slurry with a particle size of less than 1 mm. The dispersant is used to avoid the aggregation of carbide slag, and specifically, triethanolamine and / or diethanolamine can be used. The solid content of carbide slag used in the present invention is 30% to 95%, and its main mineral component is calcium hydroxide, wherein the calcium oxide content is more than 75%, the silicon oxide content is more than 3%, and the alumina content is more than 1%.

[0037] ...

Embodiment 1

[0048] The concrete steps of this embodiment are as follows:

[0049] (1) 35 parts by mass of carbide slag, 0.8 part by mass of diethanolamine dispersant and 120 parts by mass of water are mixed, stirred and sieved to obtain a calcium carbide slag slurry with a diameter of less than 1 mm, and the solid content of the used carbide slag is 90%.

[0050] (2) The calcium carbide slag slurry is mixed with propylene glycol grinding aid, polycarboxylate plasticizer and 300 parts by mass of zirconia balls, placed in a wet mill and ground to a median particle size of 232 nm and a specific surface area of ​​26560 m 2 / kg, sieve the grinding medium to obtain calcium carbide slag ultrafine slurry. Among them, the dosage of propylene glycol grinding aid is 1‰ of the solid content of calcium carbide slag in the calcium carbide slag slurry, and the dosage of polycarboxylate plasticizer is 17‰ of the solid content of calcium carbide slag in the calcium carbide slag slurry. The ball ratio is ...

Embodiment 2

[0055] The concrete steps of this embodiment are as follows:

[0056] (1) 35 parts by mass of carbide slag, 1 part by mass of diethanolamine dispersant and 90 parts by mass of water are mixed, stirred and sieved to obtain a calcium carbide slag slurry with a diameter of less than 1 mm, and the solid content of the used carbide slag is 90%.

[0057] (2) The calcium carbide slag slurry is mixed with propylene glycol grinding aid, polycarboxylate plasticizer and 300 parts by mass of zirconia balls, placed in a wet mill and ground to a median particle size of 241 nm (specific surface area is 25680 mm m 2 / kg), sieving the grinding medium to obtain calcium carbide slag ultrafine slurry. Among them, the dosage of propylene glycol grinding aid is 1‰ of the solid content of calcium carbide slag in the calcium carbide slag slurry, and the dosage of polycarboxylate plasticizer is 23‰ of the solid content of calcium carbide slag in the calcium carbide slag slurry. The ball ratio is 4:1:...

technical field

[0001] The invention belongs to the technical field of building materials, and particularly relates to a preparation method and application of a calcium carbide slag super-early strength admixture. Background technique

[0002] With the development of my country's construction industry, early-strength concrete plays an increasingly important role in the fields of emergency repair and construction, production of concrete prefabricated components, and road and bridge construction. In order to improve the early strength of concrete, the methods commonly used are as follows:

[0003] (1) Curing concrete with steam at 60℃~80℃ for 8h, although this method can effectively shorten the demoulding time, but the steam curing energy consumption is large, which increases the production cost of precast concrete components, and the crystal growth of hydration products is coarse, which is not suitable for The durability of concrete elements is very disadvantageous. [0004...

Examples

preparation example Construction

[0035] The specific embodiment of the preparation method of the calcium carbide slag ultra-early strength admixture of the present invention will be provided below. In this specific embodiment, the carbide slag used is from each calcium carbide method for producing acetylene, and the wet mill used is a vertical planetary ball mill, including steps:

[0036] (1) Take 20-60 parts by mass of carbide slag and 0.5-1 part by mass of dispersant, add 80-160 parts by mass of water, mix and stir, and sieve to obtain calcium carbide slag slurry with a particle size of less than 1 mm. The dispersant is used to avoid the aggregation of carbide slag, and specifically, triethanolamine and / or diethanolamine can be used. The solid content of carbide slag used in the present invention is 30% to 95%, and its main mineral component is calcium hydroxide, wherein the calcium oxide content is more than 75%, the silicon oxide content is more than 3%, and the alumina content is more than 1%.

[0037] ...

Embodiment 1

[0048] The concrete steps of this embodiment are as follows:

[0049] (1) 35 parts by mass of carbide slag, 0.8 part by mass of diethanolamine dispersant and 120 parts by mass of water are mixed, stirred and sieved to obtain a calcium carbide slag slurry with a diameter of less than 1 mm, and the solid content of the used carbide slag is 90%.

[0050] (2) The calcium carbide slag slurry is mixed with propylene glycol grinding aid, polycarboxylate plasticizer and 300 parts by mass of zirconia balls, placed in a wet mill and ground to a median particle size of 232 nm and a specific surface area of ​​26560 m 2 / kg, sieve the grinding medium to obtain calcium carbide slag ultrafine slurry. Among them, the dosage of propylene glycol grinding aid is 1‰ of the solid content of calcium carbide slag in the calcium carbide slag slurry, and the dosage of polycarboxylate plasticizer is 17‰ of the solid content of calcium carbide slag in the calcium carbide slag slurry. The ball ratio is ...

Embodiment 2

[0055] The concrete steps of this embodiment are as follows:

[0056] (1) 35 parts by mass of carbide slag, 1 part by mass of diethanolamine dispersant and 90 parts by mass of water are mixed, stirred and sieved to obtain a calcium carbide slag slurry with a diameter of less than 1 mm, and the solid content of the used carbide slag is 90%.

[0057] (2) The calcium carbide slag slurry is mixed with propylene glycol grinding aid, polycarboxylate plasticizer and 300 parts by mass of zirconia balls, placed in a wet mill and ground to a median particle size of 241 nm (specific surface area is 25680 mm m 2 / kg), sieving the grinding medium to obtain calcium carbide slag ultrafine slurry. Among them, the dosage of propylene glycol grinding aid is 1‰ of the solid content of calcium carbide slag in the calcium carbide slag slurry, and the dosage of polycarboxylate plasticizer is 23‰ of the solid content of calcium carbide slag in the calcium carbide slag slurry. The ball ratio is 4:1:...

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