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Potassium aluminosilicate nanogel precursor admixture and application thereof in low-calcium-system geopolymer

A nano-gel, potassium aluminosilicate technology, applied in cement production and other directions, can solve the problems of unstable mechanical properties, unstable properties of geopolymers, and hindering the promotion in the construction field.

Active Publication Date: 2021-10-26
SHENZHEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, the unstable performance of geopolymers hinders the promotion in the field of construction
In particular, a class of low-calcium system geopolymers such as metakaolin has the following problems: unstable mechanical properties, uneven hydration process affects workability and internal pore distribution of components, and excessive shrinkage, easy to crack, etc.

Method used

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  • Potassium aluminosilicate nanogel precursor admixture and application thereof in low-calcium-system geopolymer
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  • Potassium aluminosilicate nanogel precursor admixture and application thereof in low-calcium-system geopolymer

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preparation example Construction

[0019] In the present invention, the preparation method of the potassium aluminosilicate nanogel precursor external additive preferably comprises the following steps:

[0020] Potassium hydroxide, nano-silicon oxide, nano-alumina and water are mixed, and a hydrothermal synthesis reaction is carried out to obtain the potassium aluminosilicate nano-gel precursor external additive.

[0021] In the present invention, unless otherwise specified, all raw material components are commercially available products well known to those skilled in the art.

[0022] In the present invention, the mass ratio of the potassium hydroxide, nano silicon oxide, nano aluminum oxide and water is preferably (4~15): (1.5~4): (0.75~2): (30~100), more Preferably (5~12): (2~3.5): (0.8~1.5): (40~80), most preferably (8~10): (2.5~3): (1~1.2): (50~ 80). In the present invention, the water is preferably deionized water.

[0023] In the present invention, the mixing temperature is preferably 70-100°C, more p...

Embodiment 1

[0031] Add 300 parts of deionized water and 30 parts by mass of KOH into the polytetrafluoroethylene reaction tank, put the polytetrafluoroethylene tank in a water bath with a stirring speed of 200r / min and 95°C, and add it after the temperature rises to 95°C 16 parts by mass of nano-SiO with a particle size of 50-100 nm 2Stir for 2 minutes, add 14 parts by mass of nano-Al with a particle size of 50-100 nm 2 o 3 After stirring for 2 minutes, take out the polytetrafluoroethylene tank and seal it with plastic wrap and adhesive tape, then continue to stir in the water bath for 1 hour, turn off the stirring knob, and let it stand still at 95°C for 4 hours of constant temperature hydrothermal synthesis reaction. Centrifuge at a speed of 4000r / min for 4min, pour off the liquid components, add deionized water to stir and mix, continue to centrifuge at a speed of 4000r / min for 4min, repeat centrifugal washing for 3 times, and obtain the potassium aluminosilicate nanogel precursor add...

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Abstract

The invention provides a potassium aluminosilicate nanogel precursor admixture and application thereof in a low-calcium-system geopolymer, belonging to the technical field of geopolymer admixtures. The potassium aluminosilicate nanogel precursor external admixture provided by the invention has a structure of a high-activity potassium aluminosilicate short-chain structure, is a precursor of the low-calcium-system geopolymer, and comprises the following chemical components: K2O, SiO2 and Al2O3, wherein molar ratio of K to Si is 1.0-4.0, and a molar ratio of Al to Si is 0.25-1.5. When the potassium aluminosilicate nanogel precursor admixture provided by the invention is added into a low-calcium-system geopolymer matrix material, the hydration process of the low-calcium-system geopolymer such as metakaolin can be effectively optimized, internal reaction is balanced, and a pore structure is improved; and thus, the mechanical properties of the material are improved, the problems of harsh maintenance conditions, non-uniform hydration reaction and substandard mechanical properties of the low-calcium-system geopolymer are effectively solved, and a feasible scheme is provided for application of the low-calcium-system geopolymer.

Description

technical field [0001] The invention relates to the technical field of geopolymer admixtures, in particular to a potassium aluminosilicate nanogel precursor admixture and its application in low calcium system geopolymers. Background technique [0002] Geopolymer is a new type of gel material, which has the advantages of environmental protection and energy saving in the production process, simple process, and superior durability. Therefore, it has been of high research value since the last century. [0003] However, the instability of geopolymer performance hinders its promotion in the construction field. In particular, a class of low-calcium geopolymers such as metakaolin has the following problems: unstable mechanical properties, uneven hydration process affects workability and internal pore distribution of components, and excessive shrinkage and easy cracking. [0004] my country is the main kaolin producer in the world, and its output accounts for 78% of the world's tota...

Claims

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Application Information

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IPC IPC(8): C04B22/06C04B7/26C04B12/00
CPCC04B40/0039C04B7/243C04B12/005C04B22/062C04B22/06Y02P40/10
Inventor 方媛郑淑怡邢锋
Owner SHENZHEN UNIV
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