Preparation method of anti-crack, self-healing and root-resistant functional additive for concrete

A concrete and functional technology, applied in the field of building materials, can solve problems such as waste of resources, and achieve the effects of improving service life, increasing volume stability, and increasing osmotic pressure

Active Publication Date: 2021-06-11
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In my country, the output of copper tailings is extremely large, and most of them are treated as waste, which causes huge pressure on the environment and wastes a lot of resources.

Method used

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  • Preparation method of anti-crack, self-healing and root-resistant functional additive for concrete
  • Preparation method of anti-crack, self-healing and root-resistant functional additive for concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1) 100 parts by mass of copper tailings, 500 parts by mass of water and 1 part by mass of grinding aid are mixed and placed in a wet mill at a speed of 400 RPS to wet grind to a median particle size of 100nm to obtain nanometer copper tailings;

[0022] 2) Get 50 parts by mass of 2% (g / mL) chitosan solution and put it into an electromagnetic stirrer with a rotating speed of 300r / min, add 10 parts by mass of 0.25mol / L glutaraldehyde solution during stirring, Stir in a constant temperature water bath for 10 minutes;

[0023] 3) Add 5 parts by mass of the nano-copper tailings in step 1) to the solution in step 2) and continue the constant temperature water bath for 1 hour, freeze-dry for 24 hours to obtain the anti-cracking-self-healing-root-blocking functional additive for concrete.

Embodiment 2

[0025] 1) 100 parts by mass of copper tailings, 480 parts by mass of water and 1.2 parts by mass of grinding aid are mixed and placed in a wet mill at a speed of 420RPS to wet grind to a median particle size of 85nm to obtain nanometer copper tailings;

[0026] 2) Get 50 parts by mass of 2.2% (g / mL) chitosan solution and put it into an electromagnetic stirrer with a rotating speed of 300r / min, add 10 parts by mass of 0.28mol / L glutaraldehyde solution during stirring, Stir in a constant temperature water bath for 10 minutes;

[0027] 3) Add 6 parts by mass of the nano-copper tailings in step 1) to the solution in step 2) and continue the constant temperature water bath for 1 hour, freeze-dry for 24 hours to obtain the anti-cracking-self-healing-root-blocking functional additive for concrete.

Embodiment 3

[0029] 1) 100 parts by mass of copper tailings, 450 parts by mass of water and 1.4 parts by mass of grinding aid are mixed and placed in a wet mill at a speed of 430 RPS to wet grind to a median particle size of 70nm to obtain nano copper tailings;

[0030] 2) Get 50 parts by mass of 2.5% (g / mL) chitosan solution and put it into a 300r / min electromagnetic stirrer, add 10 parts by mass of 0.3mol / L glutaraldehyde solution during stirring, Stir in a constant temperature water bath for 10 minutes;

[0031] 3) Add 8 parts by mass of the nano-copper tailings in step 1) to the solution in step 2) and continue the constant temperature water bath for 1 hour, freeze-dry for 24 hours to obtain the anti-cracking-self-healing-root-blocking functional additive for concrete.

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Abstract

The invention discloses a preparation method of an anti-crack, self-healing and root-resistant functional additive for concrete. The preparation method comprises the following steps: step 1, mixing copper tailings, water and a grinding aid, and putting the mixture into a wet mill for wet milling to obtain nano copper tailings; step 2, putting the chitosan solution into an electromagnetic stirrer, adding a glutaraldehyde solution in the stirring process, and stirring for 10 minutes in a warm water bath; and step 3, adding 5-10 parts by mass of the nano-copper tailings in the step 1 into the solution in the step 2, continuing constant-temperature water bath for 1 hour, and freeze-drying for 24 hours to obtain the anti-cracking, self-healing and root-resistant functional additive for concrete. When a concrete structure cracks and generates microcracks, the water absorption rate of the chitosan super absorbent resin in a neutral environment is greatly improved, and the chitosan super absorbent resin quickly absorbs water and swells to block pores, so that the purpose of self-healing of the concrete is achieved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of an anti-cracking-self-healing-root-blocking functional additive for concrete. Background technique [0002] With the acceleration of urbanization and the rapid development of industrialization in our country, government departments in many cities attach great importance to the construction of roof greening to solve the problems of increasing urban construction area and the increasingly serious "urban heat island" effect. Roof greening refers to the greening of the tops, roofs and terraces of various buildings and structures that are not connected to the natural soil layer. The greening of the roof helps to increase the urban green area and improve the urban ecological environment. At present, most of the green roofs in my country use organic flexible component root-blocking materials. The later maintenance costs are high, and it is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/38C04B18/12C04B24/00C04B103/30
CPCC04B40/0039C04B2103/0068C04B18/12C04B24/38C04B24/008C04B2103/302Y02W30/91
Inventor 杨进王福龙贺行洋苏英王铁唐袁珍于肖雷
Owner HUBEI UNIV OF TECH
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