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Preparation method of nano ettringite crystal nucleus early strength agent, obtained product and application

A technology of nano-calcium and early-strength agent, which is applied in the field of road engineering materials, can solve the problems of high equipment requirements, increased cost, and influence on the early-strength effect of cement-based cementitious materials, and achieves good dispersion stability, improved early strength, and easy The effect of mass production

Pending Publication Date: 2021-08-06
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method requires a special fully back-mixed explosive nucleation reactor for reaction, which requires high equipment and increases the cost, and the obtained ettringite is of submicron level, which has certain agglomeration problems, which affects the early strength of cement-based cementitious materials. effect play

Method used

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  • Preparation method of nano ettringite crystal nucleus early strength agent, obtained product and application
  • Preparation method of nano ettringite crystal nucleus early strength agent, obtained product and application

Examples

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Effect test

Embodiment 1

[0031] Step 1: Preparation of polar dispersant: select triethanolamine with a mass fraction of 99% and a high-water-reducing polycarboxylate water-reducing agent with a sulfonic acid group with a solid content of 40%, and mix the two at a ratio of 0.3:1 The mass ratio was compounded, and diluted to 500ml deionized water. The mass fraction of the diluted mixed solution was 10%. It was stirred with a high-speed mixer for 20min at a speed of 500r / min to obtain a polar dispersant aqueous solution.

[0032] Step 2: Preparation of calcium salt and aluminum salt solutions: prepare 100ml of calcium nitrate solution with a molar concentration of 0.5mol / L, and prepare 100ml of an aluminum sulfate solution with a molar concentration of 0.3mol / L for future use.

[0033] Step 3: Preparation of sodium hydroxide solution: prepare 100 ml of sodium hydroxide solution with a molar concentration of 5 mol / L for use in order to adjust the pH value of the solution.

[0034] Step 4: Add the calcium ...

Embodiment 2

[0036] Step 1: Preparation of polar dispersant: Select triethanolamine with a mass fraction of 99% and a high-water-reducing polycarboxylate water-reducing agent with a sulfonic acid group with a solid content of 40%, and mix the two at a ratio of 0.5:1 The mass ratio was compounded and diluted to 500ml deionized water. The mass fraction of the diluted mixed solution was 15%. It was stirred with a high-speed mixer for 20min at a speed of 500r / min to obtain a polar dispersant aqueous solution.

[0037] Step 2: Preparation of calcium salt and aluminum salt solutions: prepare 100 ml of calcium nitrate solution with a molar concentration of 1.0 mol / L, and prepare 100 ml of an aluminum sulfate solution with a molar concentration of 0.5 mol / L for future use.

[0038] Step 3: Preparation of sodium hydroxide solution: Prepare 100 ml of sodium hydroxide solution with a molar concentration of 5 mol / L for use in order to adjust the pH value of the solution.

[0039] Step 4: Add the calci...

Embodiment 3

[0041]Prepare the nano ettringite crystal nucleus early strength agent according to the method of Example 2, the difference is: in step one, the mass fraction is 99% triethanolamine and solid content is the high water reduction type containing sulfonic acid group The mass ratio of polycarboxylate superplasticizer is 0.8:1. The obtained nano ettringite crystal nucleus early strength agent is in the form of an emulsion, and the particle diameter of the nano ettringite is 80-140nm after testing.

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Abstract

The invention discloses a preparation method of a nano ettringite crystal nucleus early strength agent as well as an obtained product and application of the nano ettringite crystal nucleus early strength agent. The nano ettringite crystal nucleus early strength agent is prepared by sequentially and slowly dropwise adding a calcium salt solution and an aluminum salt solution into a polar dispersant aqueous solution at normal temperature, adjusting the pH value to 10.0-12.0 by using a sodium hydroxide solution and synchronously stirring in the dropwise adding process. The nano ettringite crystal nucleus early strength agent prepared by the invention is relatively small in particle size and relatively good in dispersion stability, can greatly improve the mechanical properties of a cement-based grouting material at all ages, and particularly has a remarkable effect of improving the early strength of the cement-based grouting material. Heating and ultrasonic dispersion are not needed during preparation, and the preparation method is simple and suitable for large-scale production.

Description

technical field [0001] The invention relates to a preparation method of a nano ettringite crystal nucleus early strength agent and a product obtained therefrom, and also relates to the application of the nano ettringite crystal nucleus early strength agent in cement-based grouting materials, belonging to the technical field of road engineering materials. Background technique [0002] Semi-flexible pavement is a new type of pavement material prepared by pouring a cement-based grouting material into large-pore asphalt mixture. It has excellent bearing capacity and volume stability, and can effectively improve the common rutting, Problems such as deformation and weather resistance, so it can be used in bus stops, road junctions, parking lots, toll booths and gas stations, etc. [0003] Semi-flexible pavements have extremely high requirements on the early strength of cement-based grouting materials. Therefore, accelerators are one of the indispensable components of cement-based ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14C04B103/12
CPCC04B22/142C04B2103/12
Inventor 叶正茂牛腾卢晓磊吴佳明孙晓杰
Owner UNIV OF JINAN
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