Functional porous cement based composite material and preparation method thereof

A composite material and cement-based technology, applied in the field of material science and engineering, can solve the problems of difficult large-scale application and high cost of ceramic membranes, and achieve the effects of easy acquisition, low cost and simple preparation process

Inactive Publication Date: 2015-03-25
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Titanium dioxide inorganic composite membranes have excellent chemical stability and remarkable photocatalytic and separation effects, but due to the high cost of ceramic membranes, it is difficult to achieve large-scale applications
At present, there are no reports and patents related to the porous cement-based material doped with titanium dioxide / graphene oxide.

Method used

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  • Functional porous cement based composite material and preparation method thereof
  • Functional porous cement based composite material and preparation method thereof
  • Functional porous cement based composite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The preparation of functional porous cement-based composite material, the method is as follows:

[0037] 1) Preparation of graphite oxide: take 5g of graphite and 5g of sodium nitrate and place in a three-necked flask equipped with 160mL98wt% concentrated sulfuric acid, stir and react at a constant temperature in an ice bath for 1h, then continue to add 23g of potassium permanganate slowly in portions (note Keep the temperature), and keep stirring for 2h, then place it at room temperature for a week, then dilute with 500mL of 5% sulfuric acid solution (note that the temperature will rise rapidly), stir for 2h, and finally add 15mL of 30% hydrogen peroxide to reduce the remaining potassium permanganate for 2h. After repeated washing with water and centrifugation for several times until it becomes neutral, it is then vacuum-dried to obtain graphite oxide.

[0038] 2) Preparation of titanium dioxide colloidal suspension solution: firstly take 100mL tetrabutyl titanate and ...

Embodiment 2

[0043] Preparation of Undoped Porous Cementitious Composites:

[0044] 1) Preparation of cement composite slurry: Weigh 350g of water, 700g of cement, and 600g of ceramsite (particle size after crushing: 0.5-5mm) and mix them with a mixer for 3 minutes to obtain a cement composite slurry.

[0045] 2) Forming and maintenance of porous cement-based composite materials: After injecting the cement composite slurry in the above 1) into the mold (150×150×150mm) and flattening and vibrating, in order to facilitate the algae separation test, pre-prepared in the center of the upper surface. Press out a small pit with a depth of about 2cm, and leave the mold for 24 hours. The demoulded samples were placed in the laboratory for 28 days under natural conditions to obtain an undoped porous cement-based composite material.

Embodiment 3

[0047] The preparation of functional porous cement-based composite material, the method is as follows:

[0048] 1) Preparation of graphite oxide solution: Weigh 5g of flake graphite and 5g of sodium nitrate in a three-necked flask filled with 160mL98% concentrated sulfuric acid, stir and react at a constant temperature in an ice bath for 1h, then continue to add 23g of potassium permanganate slowly in portions , and kept stirring for 2 hours, then left it at room temperature for a week, then diluted it with 500 mL of 5% sulfuric acid solution and stirred for 2 hours, and finally added 15 mL of 30% hydrogen peroxide to reduce the remaining potassium permanganate for 2 hours. After repeated washing with water and centrifugation for several times until it becomes neutral, it is then vacuum-dried to obtain graphite oxide.

[0049] 2) Preparation of titanium dioxide colloidal suspension solution: Firstly, 20 mL of tetrabutyl titanate and 5 mL of acetylacetone were dissolved in 40 m...

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Abstract

The invention belongs to the technical field of material science and engineering and particularly relates to a functional porous cement based composite material and a preparation method thereof. The composite material is prepared from the following raw materials: cement, aggregates, water, additives and a catalyst in a ratio of (1-1.2):(0.5-0.6): (0.2-0.8):(0-0.04):(0-0.2), wherein the content of the catalyst is not zero and the catalyst is a compound of titanium dioxide and graphene oxide. The invention provides the functional porous cement based composite material which not only has a separating function, but also has the characteristics of being photocatalytic, pollution-resistant and self-cleaning. The functional porous cement based composite material is simple in preparation process and low in cost and has wide application prospect in the technical industry of environmental protection and management.

Description

technical field [0001] The invention belongs to the technical field of material science and engineering, and in particular relates to a functional porous cement-based composite material and a preparation method thereof. Background technique [0002] Porous cement-based composite material is a commonly used construction engineering material. When used as a wall filling material, it has the functions of heat preservation and heat insulation; when used as a material for laying road surfaces, it has good drainage, anti-skid and noise reduction properties. However, most of the research and application of this focus on the correlation between mechanical properties, thermal properties, durability and its composition and pore structure. It may also be because the internal pores are closed and disconnected, so it is rarely made into a porous separation material. research and application. [0003] Photocatalytic oxidation is a new type of pollutant harmless treatment technology, whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B28/00
CPCC04B28/02C04B2111/2061C04B14/026C04B14/305
Inventor 祝瑜张召才
Owner HENAN POLYTECHNIC UNIV
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