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A kind of chitosan-modified polymer gelling material

A technology of chitosan modification and geopolymer, which is applied in the direction of cement production, etc., can solve the problems of complex process, high brittleness, poor flexural performance and toughness, and achieve the effect of simple work flow, improved toughness and easy operation

Active Publication Date: 2019-03-15
太原理工恒基岩土工程科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, compared with the excellent compressive strength of geopolymers, its flexural properties and toughness are poor, and its brittleness is high, which seriously restricts its application in concrete components that require high flexural toughness.
[0004] At present, the toughening of geopolymers is mainly fiber toughening. However, the fiber toughened products are not very resistant to alkali corrosion, and the process is complicated, which brings difficulties to design research and practical application.

Method used

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  • A kind of chitosan-modified polymer gelling material
  • A kind of chitosan-modified polymer gelling material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add 1 g of carboxymethyl chitosan to 100 g of a mixed solution of potassium hydroxide and sodium silicate with a modulus of 1, and stir thoroughly at 30° C. for 1 h to obtain a uniform mixed solution. Take 1000g of blast furnace slag, gradually add the previously uniform mixed solution into it, and fully stir it at 20°C for 20 minutes, then inject it into the mold and vibrate to remove the air in the reactant. After reacting at room temperature (about 20°C) for 24 hours, demould, then seal the sample with a sealed bag and put it in an incubator at room temperature (about 20°C) for 28 days to obtain a geopolymer sample. At this time, the compressive strength was measured to be 58.31MPa, the flexural strength was 9.55MPa, the folding ratio was 6.11, and the flexural toughness coefficient was 5.98KN·mm.

Embodiment 2

[0030] Add 1 g of hydroxypropyl chitosan to 100 g of a mixed solution of potassium hydroxide and sodium silicate with a modulus of 1, and stir thoroughly at 50° C. for 1 h to obtain a uniform mixed solution. Take 1000g of blast furnace slag, gradually add the previously uniform mixed solution into it, and fully stir it at 20°C for 20 minutes, then inject it into the mold and vibrate to remove the air in the reactant. After reacting at room temperature (about 20°C) for 24 hours, demould, then seal the sample with a sealed bag and put it in an incubator at room temperature (about 20°C) for 28 days to obtain a geopolymer sample. At this time, the compressive strength was measured to be 60.22MPa, the flexural strength was 10.2MPa, the folding ratio was 5.90, and the bending toughness coefficient was 6.84KN·mm.

Embodiment 3

[0032] Add 1.5g N-trimethyl chitosan into 100g mixed solution of potassium hydroxide and sodium silicate with a modulus of 1, and fully stir at 50° C. for 1 hour to obtain a uniform mixed solution. Take 1000g of blast furnace slag, gradually add the previously uniform mixed solution into it, and fully stir it at 20°C for 20 minutes, then inject it into the mold and vibrate to remove the air in the reactant. After reacting at room temperature (about 20°C) for 24 hours, demould, then seal the sample with a sealed bag and put it in an incubator at room temperature (about 20°C) for 28 days to obtain a geopolymer sample. At this time, the compressive strength was measured to be 55.34MPa, the flexural strength was 8.46MPa, the folding ratio was 6.54, and the bending toughness coefficient was 6.29KN·mm.

[0033] The above Examples 1-3 and respective blank sample 28d mechanical properties are drawn in the following table 1 (the blank sample is identical with the embodiment except that...

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Abstract

The invention discloses a chitosan modified geopolymer cementing material. Chitosan is added into an alkali excitant to be sufficiently stirred and dissolved to obtain mixed solution; then the mixed solution is gradually added into a salic solid material to be stirred and uniformly mixed; the obtained product is injected into a die to perform a reaction, and after demoulding, maintenance is carried out to obtain the chitosan modified geopolymer cementing material. According to the chitosan modified geopolymer cementing material disclosed by the invention, the salic solid material is used as a main raw material; excitation is carried out by the alkali excitant; chitosan is used as a main toughening agent; a type, a mixing amount and a mixing mode of each raw material and a modulus and an alkali equivalent weight of the alkali excitant when the chitosan is used for carrying out toughening modification are determined; the system has excellent mechanical performance in a normal-temperature maintenance environment; a ratio of compressive strength of the material is obviously reduced and flexural toughness of the material can be obviously improved; as one type of cementing material, geopolymer can be applied to a concrete component with a high requirement for flexural toughness.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a modified geopolymer gelling material. Background technique [0002] Concrete is currently the most widely used building material in the world, and its commonly used cementitious material is cement. The traditional cement industry is an industry with high resource consumption, high energy consumption and high environmental load. According to statistics, every ton of cement needs to consume 1 ton of limestone, 200 kilograms of clay, 235 kilograms of standard coal, and emit 650 kilograms of carbon dioxide, and the annual amount of soot and soot emitted into the atmosphere by cement production is nearly 10 million tons. Therefore, there is an urgent need for a new type of green cementitious material as a substitute for Portland cement. [0003] As a newly developed cementitious material, geopolymer has low raw material prices and abundant reserves. It can be produced...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24
CPCC04B7/243C04B12/005Y02P40/10
Inventor 陈潇王杰朱国瑞周明凯陈谦
Owner 太原理工恒基岩土工程科技有限公司
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