Preparation method of nano-silica compacted concrete

A nano-silica, dense concrete technology, applied in the field of concrete production, can solve the problems of low durability of high-performance concrete, increased self-shrinkage of concrete, easy cracking, etc., and achieves low porosity, good effect and low cost. Effect

Active Publication Date: 2019-03-08
HOHAI UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

However, this method will increase the self-shrinkage of concrete, and it will be easy to crack in the early stage, which will make the durability of high-performance concrete engineering not high.

Method used

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  • Preparation method of nano-silica compacted concrete
  • Preparation method of nano-silica compacted concrete
  • Preparation method of nano-silica compacted concrete

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Embodiment 1～10

[0033] The preparation method of the nano-silica dense concrete described in Embodiment 1 to Embodiment 10 of the present invention is basically the same, specifically:

[0034] A preparation method of nano silicon dioxide dense concrete, comprising the following steps:

[0035] S1. Coating nano-alumina with a thickness of 1nm-20nm on the surface of nano-silicon dioxide with an average particle size of 10nm-100nm to obtain surface-treated nano-silicon dioxide; specifically:

[0036] S101. Coating a layer of nano-alumina with a thickness of 1nm-20nm on the surface of nano-silica with an average particle size of 10nm-100nm and a mass of M by using a mechanical ball milling method;

[0037] S102. Add 2%M-5%M silane coupling agent to the mixture prepared in step S101 for surface modification, so as to obtain surface-treated nano silicon dioxide.

[0038] S2. Take the surface-treated nano-silicon dioxide prepared by the step S1 with a quality of N, and prepare a nano-silicon dioxi...

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Abstract

The invention discloses a preparation method of nano-silica compacted concrete. The preparation method comprises the following steps: preparing nano-silica of which the surface is coated with nano-alumina into a nano-silica aqueous solution with the concentration of 0.05 to 0.5 mol/L and injecting the nano-silica aqueous solution into an electrolytic cell; putting a concrete specimen with built-insteel bars into the electrolytic cell, connecting the steel bars into a power supply cathode, arranging an auxiliary anode parallel to the concrete specimen outside the concrete specimen and connecting the auxiliary anode into a power supply anode; under the condition of 0 to 4 DEG C, applying 6 to 96 V/cm impressed voltage between the power supply cathode and the power supply anode in the S3 andthen electrifying. According to the method disclosed by the invention, by taking the nano-silica as a raw material and applying an external electric field, the nano-silica enters pores of the concrete through electrophoresis drive; by utilizing C-S-H gel generated through reacting the nano-silica solution with calcium hydroxide, the pores in the concrete are filled to obtain compacted concrete, and further the durability of the concrete is improved.

Description

technical field [0001] The invention belongs to the technical field of concrete production, and in particular relates to a preparation method of nano silicon dioxide dense concrete. Background technique [0002] Cement concrete has abundant raw materials, low price, and superior mechanical properties, making it the most widely used engineering material in the world today. However, under the influence of working environment and internal factors of materials, cement concrete often suffers from deterioration of durability, which causes huge damage to the economy, life and property safety of people all over the world. [0003] Concrete is a typical porous media material. Pores in concrete are aggressive media in the environment such as H 2 O, O 2 , CO 2 , Cl - , SO 4 2- Such intrusions provide convenient passages, which cause concrete durability diseases such as chloride corrosion, freeze-thaw, carbonation and chemical erosion. At present, a common method to deal with th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B40/02C04B40/00
CPCC04B40/0003C04B40/0204
Inventor 徐金霞刘莉单鸿猷蒋林华秦昭巧田静航张俊赵亮
Owner HOHAI UNIV
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