Alkali-free setting accelerator containing coagulation and early-strength accelerator and organic amine substance and preparation method thereof

A technology of accelerating coagulation, early strength, and organic amines, applied in the field of alkali-free accelerators and their preparation, can solve the problems of increased strength retention rate, concrete structure damage, strong alkalinity of accelerators, etc., and can reduce expansion and cracking. Possibility, reduce the late strength loss, improve the effect of early strength

Inactive Publication Date: 2018-03-30
SICHUAN TONGZHOU CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In the prior art, the main components of traditional accelerators are alumina clinker, carbonate, sodium silicate and other inorganic salts. Although this accelerator can basically meet the engineering requirements for setting time and early strength, but This quick-setting agent is strongly alkaline, and the presence of strong alkali can easily cause alkali-aggregate reaction, causing damage to the concrete structure, and the strength loss in the later period is generally 30% to 40%, which

Method used

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  • Alkali-free setting accelerator containing coagulation and early-strength accelerator and organic amine substance and preparation method thereof
  • Alkali-free setting accelerator containing coagulation and early-strength accelerator and organic amine substance and preparation method thereof
  • Alkali-free setting accelerator containing coagulation and early-strength accelerator and organic amine substance and preparation method thereof

Examples

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Effect test

Embodiment 1

[0036]A kind of non-alkali quick-setting agent containing coagulation accelerating agent organic amines and preparation method thereof, is: in the 500ml three-necked or four-necked flask that is equipped with stirring, condensing, heating device, add the aluminum sulfate 40g that grinds, Magnesium sulfate 8g and deionized water 36.5g, heat up to 65°C, stir to dissolve while heating, add 5g of sodium fluoride at the same time, stir to form a uniform and stable system, then add 0.28g of triisopropanolamine, 2g of polyacrylamide, 1.5 g of tartaric acid, stirred rapidly for 30-60 minutes, and cooled to room temperature to obtain a non-alkali quick-setting agent containing an organic amine substance as a coagulation accelerator (hereinafter referred to as an alkali-free liquid accelerator). The main performance indicators when the accelerator content is 7%, clean slurry: initial setting time is 2.42min, final setting time is 7.41min; mortar: 1d compressive strength 15.6MPa, 28d comp...

Embodiment 2

[0038] A kind of non-alkali quick-setting agent containing coagulation accelerating agent organic amines and preparation method thereof, is: in the 500ml three-necked or four-necked flask that is equipped with stirring, condensing, heating device, add the aluminum sulfate 42g that grinds, Magnesium sulfate 10g and deionized water 35g, heat up to 80°C, stir and dissolve while heating to form a uniform and stable system, then add 0.3g of diethanol monoisopropanolamine, 3g of polyacrylamide, 2g of citric acid, stir rapidly for 30 After ~60min, cool down to room temperature to obtain the alkali-free liquid accelerator. The main performance indicators when the accelerator content is 7%, clean slurry: initial setting time is 2.31min, final setting time is 7.24min; mortar: 1d compressive strength 17.2MPa, 28d compressive strength ratio is 90.7%.

Embodiment 3

[0040] A kind of non-alkali quick-setting agent containing coagulation accelerating agent organic amines and preparation method thereof, is: in the 500ml three-necked or four-necked flask that is equipped with stirring, condensing, heating device, add the aluminum sulfate 38g that grinds, Magnesium sulfate 12g and deionized water 34g, heat up to 65°C, stir to dissolve while heating, add 3g of sodium fluoride at the same time, stir to form a uniform and stable system, then add 0.25g of triisopropanolamine, 5g of polyacrylamide, tartaric acid 2g, stirred rapidly for 30-60min, cooled to room temperature, and the alkali-free liquid quick-setting agent was obtained. The main performance indicators when the accelerator content is 7%, clean slurry: initial setting time is 2.54min, final setting time is 7.46min; mortar: 1d compressive strength 14.4MPa, 28d compressive strength ratio is 87.9%.

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Abstract

The invention discloses an alkali-free setting accelerator containing a coagulation and early-strength accelerator and an organic amine substance and a preparation method thereof. The alkali-free setting accelerator is characterized by comprising the following raw materials in percentages by mass: 35% to 50% of aluminum sulfate, 3% to 15% of magnesium sulfate, 0 to 15% of sodium fluoride, 0.125% to 0.5% of the organic amine substance, 1% to 5% of a thickening agent and 1% to 5% of a stabilizing agent, with the balance being water, wherein the mass percents of the components sum to 100%; and the organic amine substance is any one selected from the group consisting of triisopropanolamine, diethanolisopropanolamine and tetrahydroxyethyladipicdiamide. The preparation method comprises steps ofbatching, raw material mixing under stirring, and formation of a uniform and stable system. The alkali-free setting accelerator provided by the invention is alkali-free, has good cohesiveness, low resilience value, high later strength retention rate and moderate cost, can be extensively applied to construction of tunnels, culverts, sinking and driving engineering, etc., can realize large-scale industrial production, and has strong strong practicability.

Description

technical field [0001] The invention belongs to concrete admixtures used as building materials, and relates to an alkali-free setting accelerator containing an organic amine substance of a setting accelerator and an early strength agent and a preparation method thereof. The non-alkali accelerator containing coagulation accelerator and organic amine is especially suitable as an accelerator in shotcrete, and can be widely used in the initial support of railway and highway tunnels, water diversion culverts, mine shafts, and underground projects. Protection and final lining, repair and reinforcement of damaged works, foundation and slope works, thin shell structures and demolition works, etc. Background technique [0002] Shotcrete does not need or only needs a single-sided formwork, and can make thin-walled structures in any direction. The process is simple, convenient and flexible, and has wide practicability; The time required for the slurry to become solid; initial setting ...

Claims

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Application Information

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IPC IPC(8): C04B24/26C04B24/12C04B103/12
CPCC04B24/122C04B40/0039C04B2103/12C04B22/148C04B22/142C04B22/126C04B24/2652C04B24/06C04B22/002
Inventor 舒豆豆刘才林冯全祥杨海君杨志飞何年罗率唐峰
Owner SICHUAN TONGZHOU CHEM TECH
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