Chitosan modified geopolymer cementing material

A technology of chitosan modification and geopolymer, applied in cement production, etc., can solve the problems of high brittleness, complicated process, poor flexural performance and toughness, and achieve the effect of improving toughness, simple working process and easy operation

Active Publication Date: 2017-05-31
太原理工恒基岩土工程科技有限公司
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  • Summary
  • Abstract
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  • Application Information

AI Technical Summary

Benefits of technology

This patented technology involves modifying calcium silicate (CSA) into ceramic powder or create new forms by adding certain substances like amino acids). These modifications help make C SA more durable at extreme temperatures while still maintain its strength when cured properly. By doing this, these modified products could potentially replace existing plastic reinforced concretes made from petroleum resources.

Problems solved by technology

This patented technical problem addressed in this patents relates to finding ways to make stronger or more durable cements without increasing their cost. GeoPolymer (GPM) was invented earlier than other types of hydraulic binder but had limitations due to lower raw material costs and limited availability. To overcome these issues, some companies started exploring different methods like adding fibers instead of sands/clays during manufacturing processes.

Method used

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  • Chitosan modified geopolymer cementing material
  • Chitosan modified geopolymer cementing 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

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Claims

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Application Information

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Owner 太原理工恒基岩土工程科技有限公司
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