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Preparation method for early strength alkali-free liquid accelerator

A technology of quick-setting agent and early-strength type, applied in the field of early-strength alkali-free liquid quick-setting agent and its preparation, can solve the problems of concrete strength and durability decline, damage to human health, corrosion damage to construction workers, etc. The effect of good sexuality and probability reduction

Active Publication Date: 2019-02-01
SHANDONG HONGYI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high alkali content in the concrete quick-setting agent will cause corrosion damage to the construction personnel on the one hand and damage human health. On the other hand, it may also cause the alkali-aggregate reaction of the concrete, resulting in a decrease in the strength and durability of the concrete in the later stage.
The invention patent disclosed by Chang'an University (application number: 2016110965096) provides an accelerator with low early strength, which is likely to affect the normal construction of shotcrete

Method used

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  • Preparation method for early strength alkali-free liquid accelerator

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Embodiment 1

[0022] A preparation method of an early-strength type non-alkali liquid quick-setting agent, comprising the following steps:

[0023] (1) The preparation method of modified alcohol amine: Add alcohol amine, amine organic matter and catalyst into a 250ml four-necked bottle equipped with a mechanical stirring device, a circulating condensing device, and a thermometer, and the molar ratio is 1:3:0.005. After reacting at ℃ for 1 hour, add 2 mol of organic acid to the obtained mixed solution to react for 0.5 hour to obtain modified alcohol amine;

[0024] (2) Preparation of early-strength non-alkali liquid quick-setting agent: first place 60g of aluminum sulfate, 6g of magnesium sulfate and 6g of organic acid in a three-necked flask, then add 30g of deionized water, and heat it at 400r / h under a constant temperature water bath at 80°C. min and stirred for 1.5h to obtain the quick-setting agent mother liquor; in a constant temperature water bath at 65°C, stirred at 350r / min, then ad...

Embodiment 2

[0035] A preparation method of an early-strength type non-alkali liquid quick-setting agent, comprising the following steps:

[0036] (1) Preparation method of modified alcohol amine: add alcohol amine, amine organic matter and catalyst into a 250ml four-necked bottle equipped with a mechanical stirring device, a circulating condensing device, and a thermometer, and the molar ratio is 1:2.5:0.0045. After reacting at 65°C for 1.5 hours, add 3 mol of organic acid to the obtained mixed solution to react for 45 minutes to obtain modified alcoholamine;

[0037] (2) Preparation of early-strength non-alkali liquid quick-setting agent: first place 75g of aluminum sulfate, 8g of magnesium sulfate and 5g of organic acid in a three-necked flask, then add 19g of deionized water, and heat it at 400r / h under a constant temperature water bath at 80°C. Stir for 2 hours to obtain the quick-setting agent mother liquor; in a constant temperature water bath at 65°C, stir at 400r / min, then add 10g...

Embodiment 3

[0048] A preparation method of an early-strength type non-alkali liquid quick-setting agent, comprising the following steps:

[0049] (1) Preparation method of modified alcohol amine: add alcohol amine, amine organic matter and catalyst into a 250ml four-necked bottle equipped with a mechanical stirring device, a circulating condensing device, and a thermometer, and the molar ratio is 1:3:0.01. After reacting at 75°C for 1 hour, add 3 mol of organic acid to the obtained mixed solution to react for 45 minutes to obtain modified alcohol amine;

[0050] (2) Preparation of early-strength non-alkali liquid quick-setting agent: first place 85g of aluminum sulfate, 10g of magnesium sulfate and 5g of organic acid in a three-necked flask, then add 20g of deionized water, and heat it at 400r / h under a constant temperature water bath at 85°C. Stir for 2 hours to obtain the quick-setting agent mother liquor; in a constant temperature water bath at 70°C, stir at 400r / min, then add 10g of m...

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Abstract

The invention discloses a preparation method for an early strength alkali-free liquid accelerator, and belongs to the technical field of building materials. The accelerator is prepared from the following components in percentage by mass: 55-70 % of aluminum sulfate, 5-10 % of magnesium sulfate, 5-10 % of modified alcohol amine, 2-5 % of organic acid, 1-3 % of stabilizer, 1-3 % of EDTA, 0.5-2 % ofcalcium formate and the rest of water. The method specifically comprises the following steps: (1) preparation of the modified alcohol amine; (2) preparation of the early strength alkali-free liquid accelerator. The early-strength alkali-free liquid accelerator can be used in sprayed concrete industry, as the alkali content of the early-strength alkali-free liquid accelerator is less than 1 %, thestability period is more than 3 months, the 1d compressive strength can reach 19.93 MPa, and the 28d compressive strength loss is small, the early-strength alkali-free liquid accelerator is an early-strength alkali-free liquid accelerator, and can be widely applied to initial construction and emergency repair of multiple construction projects.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an early-strength alkali-free liquid accelerator and a preparation method thereof. Background technique [0002] Accelerator refers to the admixture used in cement concrete to make it harden quickly. Since the 1990s, our country has promoted the construction technology of concrete wet spraying, and it has become a key issue to ensure the quality of sprayed finished products and reasonable construction process. The development of an accelerator with excellent performance and good coagulation-accelerating effect is the premise guarantee. [0003] At present, accelerators are divided into two types: powder and liquid. Among them, powder accelerators are gradually being replaced by liquid accelerators due to poor construction conditions and damage to the health of construction workers. The construction process is not suitable for control . In today's on-site...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C04B103/12
CPCC04B40/0039C04B2103/12C04B24/122C04B22/148C04B22/142C04B24/04C04B24/16C04B24/12
Inventor 王志强宋南京潘玉杰司宏振秦尤敏李耀张辉
Owner SHANDONG HONGYI TECH
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