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In-situ carbonization method for improving structural properties of carbonized product

A technology of structural properties and carbonized products, which is applied in the field of building materials, can solve problems such as increased maintenance costs, conflicts with energy saving and emission reduction, and difficulty in control, and achieves the effects of improving compactness and strength, low cost, and increasing the degree of carbonization

Pending Publication Date: 2019-04-12
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These two measures not only have complicated conditions and are difficult to control, but also greatly increase the maintenance cost, which is contrary to the original intention of energy conservation and emission reduction.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) Raw material preparation: before the carbonized product is formed, add 5% Bacillus pasteurianus in the raw material according to the mass ratio, put it into a ball mill and stir for 2 hours;

[0021] (2) Prepare urea nutrient solution: take 1L of water, add 20g urea, 3g beef extract, 5g peptone and 5g sodium chloride into the water and stir to dissolve it, adjust the pH value of the nutrient solution with sodium hydroxide solution and hydrochloric acid solution to 7 for use.

[0022] (3) Soaking and curing: Mix the raw materials and urea nutrient solution in proportion and then carry out molding and carbonization. After carbonization, put the product into the above nutrient solution for curing for 24 hours, and the curing temperature is kept at 30°C.

[0023] The mechanical properties of the samples were tested according to GB / T50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete". The degree of carbonization of the product was evalua...

Embodiment 2

[0026] (1) Preparation of raw materials: before the carbonized product is formed, 10% of Sarcina pasteuriani is added to the raw material in proportion by mass, and it is put into a ball mill and stirred for 2 hours;

[0027] (2) Prepare urea nutrient solution: take 1L of water, add 40g urea, 3g beef extract, 5g peptone and 5g sodium chloride into the water and stir to dissolve it, adjust the pH value of the nutrient solution with sodium hydroxide solution and hydrochloric acid solution to 7 for use.

[0028] (3) Soaking and curing: Mix the raw materials and urea nutrient solution in proportion and then carry out molding and carbonization. After carbonization, put the product into the above nutrient solution for curing for 18 hours, and the curing temperature is kept at 30°C.

[0029] The mechanical properties of the samples were tested according to GB / T50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete". The degree of carbonization of the pro...

Embodiment 3

[0032] (1) Raw material preparation: before the carbonized product is formed, add 5% Bacillus pasteurianus in the raw material according to the mass ratio, put it into a ball mill and stir for 2 hours;

[0033] (2) Prepare urea nutrient solution: take 1L of water, add 80g urea, 3g beef extract, 5g peptone and 5g sodium chloride into the water and stir to dissolve it, adjust the pH value of the nutrient solution with sodium hydroxide solution and hydrochloric acid solution to 7 for use.

[0034] (3) Soaking and curing: Mix raw materials and urea nutrient solution in proportion, then carry out molding and carbonization. After carbonization, put the product into the above nutrient solution for curing for 20 hours, and the curing temperature is kept at 30°C.

[0035] The mechanical properties of the samples were tested according to GB / T50081-2002 "Standard for Test Methods of Mechanical Properties of Ordinary Concrete". The degree of carbonization of the product was evaluated by ...

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Abstract

The invention discloses an in-situ carbonization method for improving the structural properties of a carbonized product. Before the carbonized product is formed, when raw materials are mixed, alkali-resistant bacteria capable of performing the urea hydrolysis reaction are added and uniformly distributed in the raw materials; when the product is formed, a urea nutrient solution replaces a water-mixed water to form the product; after forming, demolding and carbonization maintenance, the product is immersed in the urea nutrient solution for continuous maintenance. According to the method, the bacterial powder is added in the carbonized product, the bacteria are in contact with the urea nutrient solution in the later maintenance process, and therefore the urea hydrolysis reaction is conducted;urea is decomposed into carbon dioxide and water through the metabolism of the bacteria, carbonate ions are generated from the inside, and therefore the carbonization process from inside to outside is achieved. By means of the method, the carbonization degree of the carbonized product can be increased, and the compactness and the strength are improved accordingly; compared with methods for greatly increasing the pressure of carbon dioxide and the like, the cost is low, and the process is simple.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an in-situ carbonization method for improving the structural performance of carbonized products. Background technique [0002] With the continuous aggravation of global warming, human beings have paid more and more attention to the utilization of carbon dioxide. Carbonized hardened calcium silicate products are produced accordingly. Studies have shown that most calcium silicate minerals in cement have high carbonization reactions, among which CS, γ-C 2 Calcium silicate minerals with extremely low hydration activity such as S have high carbonization activity, and its products can obtain higher strength in a short time. [0003] As a new type of structural material, there are still many problems to be solved in carbonized hardened calcium silicate products. For example, its carbonization depth is limited. Limited, can only be limited to small volume, thin s...

Claims

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Application Information

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IPC IPC(8): C04B24/00C04B24/14C04B40/02
CPCC04B24/00C04B40/0039C04B40/0231C04B2103/0001C04B24/126C04B24/14C04B22/124C04B28/00
Inventor 王发洲赵思雪刘志超
Owner WUHAN UNIV OF TECH
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