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Novel environment-friendly liquid alkali-free cement accelerator

A technology of quick-setting agent and cement, which is applied in the field of building materials, can solve the problems of short setting time, low early strength, large rebound rate, etc., and achieve the effect of improving comprehensive performance and wettability

Pending Publication Date: 2021-07-27
CHINA RAILWAY DESIGN GRP CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the disadvantages of cement quick-setting agent in the prior art, such as low early strength, large rebound rate, unstable setting time, excessive alkali content and fluorine ion content, etc., improves the formula of cement quick-setting agent, and provides an anti- Environmentally friendly liquid alkali-free cement accelerator with improved compressive strength, low rebound rate, short setting time, extremely low alkali content, no fluoride ion, chloride ion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Prepare the basic raw material components of the accelerator: 1500kg of water, add 500kg of aluminum sulfate, 60kg of magnesium sulfate, 20kg of urea, 30kg of diethanolamine, 20kg of ethylenediaminetetraacetic acid and stir to dissolve at 40-75°C, then add 15kg of phosphoric acid to adjust the pH =3.5, then cool down and discharge for later use.

[0027] Preparation of additives: fumed silicon dioxide is dissolved in water to form a transparent colloidal solution, adding ethanolamine modifier to the transparent colloidal solution, and heating to 20°C-40°C under continuous stirring.

Embodiment 2

[0029] Preparation of basic raw material components of accelerator: 1000kg of water, 300kg of aluminum hydroxide, 40kg of magnesium sulfate, 130kg of calcium nitrate, 20kg of ethanolamine, 10kg of citric acid and stirring at 40-75°C to dissolve, then add 10kg of dilute sulfuric acid to adjust the pH = 3.5, then cool down and discharge for later use.

[0030] Preparation of additives: fumed silicon dioxide is dissolved in water to form a transparent colloidal solution, adding a triethanolamine modifier to the transparent colloidal solution, and heating to 30°C-50°C under continuous stirring.

Embodiment 3

[0032] Prepare the basic raw material composition of the accelerator: 500kg of water, add 300kg of carboxylated aluminum, 10kg of magnesium sulfate, 20kg of calcium formate, 30kg of triisopropanolamine, 5kg of oxalic acid and stir to dissolve at 40-75°C, then add 10kg of boric acid to adjust the pH =3.5, then cool down and discharge for later use.

[0033] Preparation of additives: dissolving fumed silicon dioxide in water to form a transparent colloidal solution, adding diethanolamine modifier to the transparent colloidal solution, and heating to 50-70° C. under continuous stirring.

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Abstract

The invention belongs to the field of building materials, and particularly relates to a novel environment-friendly liquid alkali-free cement accelerator which comprises basic raw materials and additives; the basic raw materials comprise aluminum sulfate, magnesium sulfate, an early strength agent, a stabilizer, a regulator and water; and the additive is modified fumed silica. According to the cement accelerator, an existing formula is improved, and the additive modified fumed silica is added, so that the setting time of a cementing material is shortened, the compressive strength is improved, the rebound rate is low, the cementing material is free of alkali, fluorine and chlorine, adverse effects on a human body and the environment are avoided, and all technical requirements in the existing railway standard Q / CR807-2020 are met.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a novel environment-friendly liquid alkali-free cement quick-setting agent. [0002] technical background [0003] Cement accelerator is a chemical admixture that can set cement or concrete quickly, also known as coagulant, it can make cement concrete set and harden in a short period of time, usually mixed with shotcrete, slip form concrete and In sand-wrapped concrete, it is widely used in thin-walled structures, curved surface structures, mine shafts, roadway support, tunnels and other underground projects, protection projects, maintenance projects, refractory lining projects, slope and foundation pit reinforcement projects, etc., especially for mines In the construction of shotcrete in the construction of underground projects such as tunnels and tunnels, in addition to the high requirements for the strength of the concrete, it also has high requirements for its construction pe...

Claims

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Application Information

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IPC IPC(8): C04B24/12C04B103/12
CPCC04B40/0039C04B2103/12
Inventor 苏伟孟庆余夏勇曾青禚一吴强苏哿郑荣政王旭霍思逊李洋金卫土胡定远汤鹏飞朱平乐刘宝举张明虎李润杨大伟欧阳会幼刘鹏贾颖超
Owner CHINA RAILWAY DESIGN GRP CO LTD
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