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A kind of early-strength liquid alkali-free accelerator for shotcrete and preparation method thereof

A shotcrete and early-strength technology, applied in the field of concrete materials, can solve the problems of poor later strength and durability, large pollution, strong alkalinity, etc., and achieve the effect of reducing possibility and good adaptability

Active Publication Date: 2020-01-14
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies such as strong alkalinity, large pollution, poor strength and durability in the later period that are common in existing concrete accelerators, and provide an early-strength liquid alkali-free accelerator for shotcrete and a preparation method thereof

Method used

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  • A kind of early-strength liquid alkali-free accelerator for shotcrete and preparation method thereof
  • A kind of early-strength liquid alkali-free accelerator for shotcrete and preparation method thereof
  • A kind of early-strength liquid alkali-free accelerator for shotcrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A. Add 40 parts of water to 55 parts of polyaluminum sulfate, stir and heat up to 60°C, then add 5 parts of aluminum hydroxide colloid and keep it warm for 1 hour to obtain a stable and transparent modified polyaluminum sulfate solution.

[0025] B. Mix diethanolamine and diethanol monoisopropanolamine according to the mass ratio of 1:1, take 50 parts of the mixture and 10 parts of glycerin, mix and stir to raise the temperature to 60°C, then slowly add 40 parts of 2-hydroxy Propionic acid, heat preservation for 1-2h, to obtain a stable and transparent modified alcohol amine solution.

[0026] C. Weigh each raw material according to the following proportions: 60% modified polyaluminum sulfate solution, 15% modified alcohol amine solution, 4% phosphoric acid, and 21% water.

[0027] D. Mix the modified polyaluminum sulfate solution and the modified alkanolamine solution, stir and raise the temperature to 60°C, stir at a constant temperature for 30 minutes to ensure that ...

Embodiment 2

[0029] A. Add 34.5 parts of water to 60 parts of polyaluminum sulfate, stir and heat up to 55-70°C, then add 5 parts of aluminum hydroxide colloid and keep it warm for 1 hour to obtain a stable and transparent solution; add 0.5 parts of graphene oxide to the stable In the transparent solution, ultrasonically disperse for 10 minutes to obtain a stable modified polyaluminum sulfate solution.

[0030] B. Mix diethanolamine and diethanol monoisopropanolamine at a mass ratio of 1:1, take 45 parts of the mixture and 15 parts of glycerin, mix and stir to raise the temperature to 60°C, then slowly add 40 parts of 2-hydroxyl while stirring Propionic acid, heat preservation for 1-2h, to obtain a stable and transparent modified alcohol amine solution.

[0031] C. Weigh the raw materials according to the proportion of the following components: 65% of modified polyaluminum sulfate, 12% of modified alcohol amine, 3% of phosphoric acid, 1% of performance modifier, and 19% of water.

[0032]...

Embodiment 3

[0034] A. Add 44 parts of water to 45 parts of polyaluminum sulfate, stir and heat up to 55-70°C, then add 10 parts of aluminum hydroxide colloid and keep it warm for 1 hour to obtain a stable and transparent solution; add 1 part of graphene oxide to the stable and transparent solution In the solution, ultrasonically disperse for 10 minutes to obtain a stable modified polyaluminum sulfate solution.

[0035] B. Mix diethanolamine and diethanol monoisopropanolamine at a mass ratio of 1:1, take 40 parts of the mixture and 20 parts of glycerin, mix and stir to raise the temperature to 60°C, then slowly add 40 parts of 2-hydroxyl while stirring Propionic acid, heat preservation for 1-2h, to obtain a stable and transparent modified alcohol amine solution.

[0036] C. Weigh the raw materials according to the following components: 70% of modified polyaluminum sulfate, 5% of modified alcohol amine, 2% of phosphoric acid, 2% of performance regulator, and 21% of water.

[0037] D. Mix t...

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Abstract

The invention relates to an early strong type liquid alkali-free accelerator used for sprayed concrete and a preparation method thereof, solving the problems of reduction of long-term strength and durability of concrete due to easy alkali-aggregate reaction caused by relatively high alkali content of existing cement accelerators. The liquid alkali-free accelerator provided by the invention is prepared from 60-75% of modified polyaluminium sulfate solution, 5-15% of modified alkanolamine solution, 0-3% of a performance modifier, 0-4% of a stabilizer and water. The accelerator belongs to an alkali-free and chloride-free liquid accelerator, is used in a sprayed concrete wet spraying process, has a stationary phase exceeding 6 months, and can realize initial setting of ordinary Portland cementof different varieties in 3 minutes and final setting in 7 minutes; and the cement mortar 1d strength reaches more than 15MPa, and 28d compressive strength ratio is greater than 110%.

Description

technical field [0001] The invention relates to the technical field of concrete materials, in particular to an early-strength liquid alkali-free accelerator for shotcrete and a preparation method thereof. Background technique [0002] Concrete quick-setting agent is mainly used in the construction of shotcrete, generally used in tunnels, culverts, industrial and mining construction, when shotcrete is used, it is added at the nozzle to make it harden and solidify quickly. Traditional quick-setting agents generally have strong alkalinity. Although they can meet the requirements of shotcrete, they also bring many problems: shotcrete has a large loss of strength in the later stage and strong corrosion. In addition, it may cause environmental pollution, especially for groundwater. The environment is polluted, there is a lot of dust, the amount of rebound is large, and it is not convenient for sprayed concrete wet operation. [0003] In order to overcome the above defects, people...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C04B24/12C04B103/12
CPCC04B40/0039C04B2103/12C04B22/148C04B22/06C04B22/02C04B24/122C04B24/026C04B24/06C04B22/165C04B24/2652
Inventor 李相国冯志浩付镇源刘卓霖蒋文广任钊锋刘漪
Owner WUHAN UNIV OF TECH
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