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Mixed-crystal nanometer TiO2 reinforced cement mortar and preparation method thereof

A cement mortar and mixed crystal technology, which is applied in the field of mixed crystal nano-TiO2 reinforced cement mortar and its preparation, can solve the problems of unsatisfactory performance of nano-TiO2 particle-reinforced composite mortar, and achieve the effect of improving performance

Active Publication Date: 2020-11-13
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, nano-TiO 2 Although it will not directly react with pozzolan on the cement matrix, its nano-scale particle size will have an important impact on the hydration hardening process of the cement matrix and the basic properties of the material
But nano TiO 2 The performance of particle reinforced composite mortar is not ideal, therefore, it is necessary to find ways to further improve the performance of composite mortar

Method used

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  • Mixed-crystal nanometer TiO2 reinforced cement mortar and preparation method thereof
  • Mixed-crystal nanometer TiO2 reinforced cement mortar and preparation method thereof
  • Mixed-crystal nanometer TiO2 reinforced cement mortar and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0021] A polycrystalline mixed nano-TiO 2 Reinforced composite mortar, the composite mortar is prepared from the following raw materials: cement: 15%, standard sand: 65%, water: 17.98%, nano-TiO in mixed crystal form of anatase and rutile 2 (Anatase:rutile=4:1): 2%, sodium silicate: 0.02%.

[0022] Polycrystalline mixed nano-TiO described in this embodiment 2 The preparation method of the reinforced composite mortar specifically comprises the following steps:

[0023] (1) Nano-TiO 2 Preparation of the suspension: Mix 40g of anatase and rutile nano-TiO 2 Add it into 120g of water and stir at room temperature (below 30°C) for 20min, add 0.4g of sodium silicate dropwise during the stirring process, and then place it in an ultrasonic disperser for ultrasonic dispersion for 30min to obtain uniformly dispersed nano-TiO 2 suspension.

[0024] (2) Mixed crystal nano TiO 2 Preparation of high-strength and high-purification rate composite cement mortar: 300g cement, 1300g standard...

Embodiment 2

[0030] A polycrystalline mixed nano-TiO 2 Enhanced composite mortar, the composite mortar is prepared from the following raw materials: cement: 15%, standard sand: 65%, water: 18.98%, nano-TiO in the mixed crystal form of anatase and rutile 2 (Anatase: Rutile=1:1) 1%, sodium silicate 0.02%.

[0031] Polycrystalline mixed nano-TiO described in this embodiment 2 The preparation method of the reinforced composite mortar specifically comprises the following steps:

[0032] (1) Nano-TiO 2 Preparation of the suspension: mix 20g of anatase and rutile nano-TiO 2 Add it into 100g of water and stir at room temperature (below 30°C) for 20 minutes, add 0.4g of sodium silicate dropwise during the stirring process, and then place it in an ultrasonic disperser for ultrasonic dispersion for 40 minutes to obtain uniformly dispersed nano-TiO 2 suspension.

[0033] (2) Mixed crystal nano TiO 2 Preparation of high-strength and high-purification rate composite cement mortar: 300g cement, 130...

Embodiment 3

[0042] A polycrystalline mixed nano-TiO 2 Enhanced composite mortar, the composite mortar is prepared from the following raw materials: cement: 17%, standard sand: 60%, water: 24.5%, brookite, rutile mixed nano-TiO 2 (brookite:rutile=2:1) ​​8%, sodium silicate 0.5%.

[0043] Polycrystalline mixed nano-TiO described in this embodiment 2 The preparation method of the reinforced composite mortar specifically comprises the following steps:

[0044] (1) Nano-TiO 2 Preparation of suspension: mix 160g of anatase and brookite with nano-TiO 2 Add it into 490g of water and stir evenly at room temperature (below 30°C) for 45min, add 10g of sodium silicate dropwise during the stirring process, and then place it in an ultrasonic disperser for ultrasonic dispersion for 30min to obtain uniformly dispersed nano-TiO 2 suspension.

[0045] (2) Mixed crystal nano TiO 2 Preparation of high-strength and high-purification rate composite cement mortar: 340g of cement and 1200g of standard sand...

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Abstract

The invention discloses mixed-crystal nanometer TiO2 reinforced cement mortar and a preparation method thereof, belonging to the technical field of preparation of building materials. The composite mortar is prepared from the following raw materials in percentage by mass: 10%-20% of cement, 55%-70% of standard sand, 1%-10% of mixed-crystal nanometer TiO2, 0.01%-0.75% of sodium silicate and 5%-25% of water, summing to 100%, wherein the sodium silicate serves as a dispersing agent of the mixed-crystal nanometer TiO2, and the mixed-crystal nanometer TiO2 is composed of two or three selected from the group consisting of brookite, anatase and rutile crystals. It is found for the first time that addition of mixed crystals formed by mixing two or three selected from the group consisting of brookite, anatase and rutile according to a certain proportion into the cement mortar can remarkably improve the mechanical properties of the cement mortar and endow the cement mortar with an environment purification function.

Description

technical field [0001] The invention relates to a mixed crystal nano TiO 2 The reinforced cement mortar and its preparation method belong to the technical field of building material preparation. Background technique [0002] Cement mortar is a very important engineering material in the field of civil engineering. It is made by mixing sand with water in a certain proportion. With the rapid development of modern science and technology, people's requirements for the performance of cement mortar are increasing day by day. Traditional cement mortar has the disadvantages of low tensile strength, high brittleness, and single function, which has been difficult to meet the needs of modern production and life. Modern cement mortar needs to gradually develop towards high performance and multi-function. At present, the performance of cement mortar is improved by adding different nanoparticles including nano-SiO2 to Portland cement and sand as matrix materials. 2 , Nano TiO 2 And so ...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B14/30
CPCC04B28/04C04B14/305C04B2201/50C04B14/06C04B22/002C04B12/04
Inventor 董祥孙亮张兰岑启宏赵焱
Owner KUNMING UNIV OF SCI & TECH
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