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A kind of alkali-free liquid accelerator and preparation method thereof

A technology of quick-setting agent and liquid, which is applied in the field of alkali-free liquid quick-setting agent and its preparation, which can solve the problems of increasing the probability of alkali-aggregate reaction, restricting promotion, and causing disability, so as to improve environmental adaptability and raw material safety The effect of easy availability and small geographical restrictions

Active Publication Date: 2021-03-02
山西科晟科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

High-alkali liquid accelerators represented by water glass type and sodium aluminate type have the following problems: 1) The 28-day compressive strength retention rate is low; 2) High alkali content damages the health of construction workers and increases Reduced the probability of alkali-aggregate reaction, resulting in a decrease in the durability of concrete
However, affected by the following factors, this series of accelerators faces unprecedented challenges: hydrofluoric acid is highly corrosive and highly toxic, and is a high-risk chemical. to harm or even disable; the production and transportation of hydrofluoric acid require specific equipment, which makes the process only available in specific regions, limiting its wide-scale promotion; in addition, since the second half of 2018, The price of hydrofluoric acid continues to rise, making the price advantage of the process disappear

Method used

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  • A kind of alkali-free liquid accelerator and preparation method thereof
  • A kind of alkali-free liquid accelerator and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Add 50kg of water, 2kg of triethanolamine, 1kg of sodium fluoride, and 2kg of zirconium sulfate into the reactor, stir until the solution is clear, then add 45kg of aluminum sulfate octadecahydrate, raise the temperature to 90°C, and continue stirring until the solution is clear. After cooling down to room temperature, solution A was obtained;

[0047] Add 36.5kg of water, 3kg of triethanolamine, and 45kg of aluminum sulfate octadecahydrate into the reactor, and slowly add 12.5kg of sodium metaaluminate solution (40%) into the reactor under stirring, continue to stir for 20 minutes, and then raise the temperature to Keep at 50°C for 1 h until the solution is clear, then cool down to room temperature, add 3 kg of 20% silica sol solution, and stir for 30 min to obtain solution B;

[0048] Mix solutions A and B according to the mass ratio of 2:3, 1:1, 3:2 to obtain alkali-free liquid accelerators 1-1, 1-2, 1-3.

Embodiment 2

[0050] Add 45kg of water, 2kg of ethanolamine, 1kg of sodium fluoride, and 2kg of titanium sulfate into the reactor, stir until the solution is clear, then add 50kg of aluminum sulfate octadecahydrate, raise the temperature to 85°C, continue stirring until the solution is clear, and the temperature of the reactor drops Solution A is obtained after reaching room temperature;

[0051] Add 32kg of water, 3kg of triethanolamine, and 50kg of aluminum sulfate octadecahydrate into the reactor, slowly add 10kg of sodium metaaluminate solution (40%) into the reactor under stirring, continue stirring for 20 minutes, and then raise the temperature to 70°C Keep for 1 h until the solution is clear, then cool down to room temperature, add 5 kg of 20% silica sol solution, and stir for 30 min to obtain solution B;

[0052] Mix solutions A and B according to the mass ratio of 2:3, 1:1, 3:2 to obtain alkali-free liquid accelerators 2-1, 2-2, and 2-3.

Embodiment 3

[0054] Add 36kg of water, 4kg of ethanolamine, 1kg of sodium fluoride, and 2kg of cerium sulfate into the reactor, stir until the solution is clarified, then add 57kg of aluminum sulfate octadecahydrate, raise the temperature to 80°C, continue stirring until the solution is clarified, and the temperature of the reactor drops Solution A is obtained after reaching room temperature;

[0055] Add 28kg of water, 3kg of triisopropanolamine, and 55kg of aluminum sulfate octadecahydrate into the reactor, and slowly add 8kg of sodium metaaluminate solution (40%) into the reactor under stirring, continue stirring for 20 minutes, and then raise the temperature Keep at 70°C for 1 h until the solution is clear, then cool down to room temperature, add 6 kg of 20% silica sol solution, and stir for 30 min to obtain solution B;

[0056] Mix solutions A and B according to the mass ratio of 2:3, 1:1, and 3:2 to obtain alkali-free liquid accelerators 3-1, 3-2, and 3-3.

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Abstract

The invention relates to an alkali-free liquid quick-setting agent, which is prepared by mixing solution A and solution B in proportion. In terms of mass percentage, the raw material components of the prepared solution A include 45-60% aluminum sulfate octadecahydrate, 0.05-1% Sodium fluoride, 2‑5% inorganic coagulation accelerator component, 2‑4% organic early strength agent and 35‑50% water; the raw materials for preparing solution B include 45‑55% octadecahydrate aluminum sulfate, 8‑15% partial Sodium aluminate, 2‑4% organic early strength agent, 3‑6% tackifier and 25‑40% water. The stability of solution A and solution B is good. On-site compounding can adjust the performance of the accelerator. On the one hand, it can overcome the influence of factors such as temperature and cementitious material changes during the construction process, and improve its adaptability to the environment; On the one hand, it can make the accelerator suitable for various types of cement. The raw materials are safe and easy to obtain, easy to transport, and the process is simple and easy to operate.

Description

technical field [0001] The invention relates to the technical field of accelerators, in particular to an alkali-free liquid accelerator and a preparation method thereof. Background technique [0002] Accelerator is an indispensable admixture in shotcrete, which makes the cement cementitious material initially set and harden within a few minutes, and the final setting can be achieved within ten minutes. It is the quick-setting agent that ensures that shotcrete has the properties of quick setting, quick hardening, and early strength, meets the requirements of special construction techniques in engineering construction, and greatly expands the application field of shotcrete. Therefore, the research and development of new high-efficiency accelerators has always been the focus of shotcrete scientific research, and has attracted the attention of concrete researchers at home and abroad. [0003] According to the properties and states of accelerators, they can be divided into powde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/12C04B103/12
Inventor 杨炎轶
Owner 山西科晟科技有限公司
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