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Nano silicon dioxide suspension, preparation method and cement-based grouting material containing suspension

A technology of nano-silica and silica, applied in the field of cement-based grouting materials, can solve problems affecting product fluidity, weak structure, large specific surface area, etc., achieve enhanced chloride ion permeability and frost resistance, and improve interface Situation, effect of reducing porosity

Active Publication Date: 2022-06-03
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the small size, large specific surface area, high surface energy, and serious water absorption of nano-silica, it is not easy to disperse evenly, and it is easy to agglomerate, which will seriously affect the fluidity of the product in cement-based grouting materials and ordinary cement concrete systems. Because the agglomeration is prone to structural weak areas, and the characteristics of nanomaterials cannot be exerted, the performance of cement-based grouting materials and ordinary cement concrete is not ideal.

Method used

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  • Nano silicon dioxide suspension, preparation method and cement-based grouting material containing suspension
  • Nano silicon dioxide suspension, preparation method and cement-based grouting material containing suspension
  • Nano silicon dioxide suspension, preparation method and cement-based grouting material containing suspension

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Embodiment 1

[0023] The preparation method of nano-silica suspension of the present invention comprises the following steps:

[0024] In step 1, the silica nanoparticles are placed in a muffle furnace, heated to 300° C. and then calcined for 2 hours, then heated to 900° C. and calcined for 4 hours, and naturally cooled to room temperature to obtain activated silica nanoparticles;

[0025] Step 2, add 0.1 part of water reducing agent, 0.1 part of coupling agent and 0.01 part of calcium hydroxide to 5 parts of water in sequence, stir evenly, then add 1 part of activated silica nanoparticles to it, stir evenly to obtain nanometer two. Silica suspending agent.

Embodiment 2

[0027] The preparation method of nano-silica suspension of the present invention comprises the following steps:

[0028] In step 1, the silica nanoparticles are placed in a muffle furnace, heated to 300° C. and then calcined for 2 hours, then heated to 900° C. and calcined for 4 hours, and naturally cooled to room temperature to obtain activated silica nanoparticles;

[0029] Step 2, add 0.3 part of water reducing agent, 0.1 part of coupling agent and 0.02 part of calcium hydroxide to 10 parts of water in turn, stir evenly, then add 1 part of activated silica nanoparticles to it, stir evenly to obtain nano-dioxide. Silica suspending agent.

Embodiment 3

[0031] The preparation method of nano-silica suspension of the present invention comprises the following steps:

[0032] In step 1, the silica nanoparticles are placed in a muffle furnace, heated to 300° C. and then calcined for 2 hours, then heated to 900° C. and calcined for 4 hours, and naturally cooled to room temperature to obtain activated silica nanoparticles;

[0033] Step 2, add 0.5 part of water reducing agent, 0.1 part of coupling agent and 0.02 part of calcium hydroxide to 10 parts of water in turn, stir evenly, then add 1 part of activated silica nanoparticles to it, stir evenly to obtain nanometer two. Silica suspending agent.

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Abstract

The invention discloses a nano silicon dioxide suspension which is prepared by mixing the following components in parts by mass: 1 part of silicon dioxide nanoparticles, 0.1-0.5 part of a water reducing agent, 0.1-0.5 part of a coupling agent, 0.01-0.03 part of calcium hydroxide and 5-20 parts of water. The preparation method comprises the following steps: firstly, carrying out high-temperature activation treatment on the silicon dioxide nanoparticles, namely heating to 300-350 DEG C for calcining, then heating to 900-950 DEG C for calcining, and naturally cooling to room temperature; and sequentially adding the water reducing agent, the coupling agent and the calcium hydroxide into the water according to the formula ratio, uniformly stirring, adding the activated silicon dioxide nanoparticles, and uniformly stirring to obtain the nano silicon dioxide suspending agent. The invention finally discloses application of the nano silicon dioxide suspension as a modifier in a cement-based grouting material.

Description

technical field [0001] The invention relates to a nano-silica suspension, and also relates to the above-mentioned nano-silica suspension and a cement-based grouting material containing the above-mentioned nano-silica suspension. Background technique [0002] A prefabricated building is a building form in which building materials are pre-produced into components, and the construction unit installs these prefabricated components on site, also known as industrialized buildings. At present, the steel sleeve connection technology is the main connection technology used in prefabricated buildings. This technology can perfectly compensate for the shortcomings of traditional connection methods, and at the same time, it has excellent performance, low cost, reduced structure weight, and convenient construction. The unique construction technology and application make the sleeve grouting material for steel bar connection required to have the properties of high fluidity, early strength, h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B28/00C04B111/70
CPCC04B40/0039C04B28/00C04B2111/70C04B2201/50C04B2201/52C04B14/062C04B2103/302C04B24/42C04B22/064C04B18/08C04B18/141C04B14/06C04B2103/50C04B2103/0068Y02W30/91
Inventor 黎水平卫超程坚李炜
Owner YANGZHOU UNIV
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