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Geopolymer with high carbonation resistance and its preparation method

A technology of geopolymer and carbonization, which is applied in the field of high carbonation resistance geopolymer and its preparation, can solve the problems of affecting the durability of alkali-induced concrete, the decrease of concrete pH value, and the destruction of steel protective film, so as to be easy to popularize and use , Eliminate foaming and expansion when encountering alkali, and reduce project cost

Active Publication Date: 2022-02-11
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The carbonation of alkali-induced concrete not only leads to a decrease in compressive strength, but also causes a decrease in the pH value inside the alkali-induced concrete, which in turn causes damage to the protective film of the steel reinforcement, accelerates the corrosion of the steel reinforcement, and causes a decrease in its bearing capacity, which seriously affects the durability of the alkali-induced concrete. sex
On the other hand, when preparing the base polymer of municipal solid waste combustion bottom ash, it is necessary to carry out alkali aging pretreatment of municipal solid waste combustion bottom ash for at least 4 hours to eliminate its foaming and expansion characteristics when encountering alkali, which is not conducive to industrialization Into production

Method used

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  • Geopolymer with high carbonation resistance and its preparation method
  • Geopolymer with high carbonation resistance and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation process of the highly carbonation-resistant polymer in this example is as follows:

[0030] Put 0.09 parts of modified multi-walled carbon nanotubes and 0.07 parts of dispersing agent in 4 parts of water, stir for 240s, and then put them under the power of 400W for 0.5 hours to obtain a uniform mixed solution of 4.16 parts, then weigh 27 parts Portland cement, 1 part of calcined metakaolin, 3 parts of silica fume, 1 part of modified red mud, 15 parts of quartz sand, poured into a mixer and stirred for 150s to obtain the mixture particle A, and then weighed 40 parts of modified city Bottom ash from solid waste combustion, 4 parts of solid sodium hydroxide and 5 parts of sodium silicate powder were added to a muffle furnace (set temperature at 700°C) for calcination for 1 hour, cooled and sieved to obtain geopolymer mixture B, Add mixture A and mixture B into the mixing pot and stir for 120s, then add 4.16 parts of the mixed solution obtained in the above ...

Embodiment 2

[0032] The preparation process of the highly carbonation-resistant polymer in this example is as follows:

[0033] Put 0.08 parts of modified multi-walled carbon nanotubes and 0.08 parts of dispersant in 4 parts of water, stir for 240s, and then put it under the power of 400W for 0.5 hours to obtain a uniform mixed solution, then weigh 23 parts of silicic acid Salt cement, 1 part of calcined metakaolin, 3 parts of silica fume, 1 part of modified red mud, and 15 parts of quartz sand were poured into a mixer and stirred for 150 seconds to obtain mixture particle A, and then 44 parts of modified municipal solid waste weighed Burn the bottom ash, add 4 parts of solid sodium hydroxide and 5 parts of sodium silicate powder into a muffle furnace (set temperature at 750°C) for calcination for 2 hours, cool and sieve to obtain geopolymer mixture B, mix Add material A and mixture B into the mixing pot and stir for 120s, then add 4.16 parts of the mixed solution obtained in the above ste...

Embodiment 3

[0036] The preparation process of the highly carbonation-resistant polymer in this example is as follows:

[0037]Put 0.09 parts of modified multi-walled carbon nanotubes and 0.08 parts of dispersing agent in 4 parts of water, stir for 300s, and then put them under the power of 400W for 0.6 hours to obtain a uniform mixed solution of 4.17 parts, then weigh 23 parts Portland cement, 1 part of calcined metakaolin, 3 parts of silica fume, 1 part of modified red mud, 15 parts of quartz sand, poured into a mixer and stirred for 150s to obtain the mixture particle A, and then weighed 44 parts of modified city Bottom ash from solid waste combustion, 4 parts of solid sodium hydroxide and 5 parts of sodium silicate powder were added to a muffle furnace (set temperature at 800°C) for calcination for 2 hours, cooled and sieved to obtain geopolymer mixture B, Add mixture A and mixture B into the mixing pot and stir for 120s, then add 4.17 parts of the mixed solution obtained in the above ...

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Abstract

The invention discloses a high-carbonization-resistant geopolymer and a preparation method thereof. The material uses urban solid waste combustion bottom ash as a base material and is combined with additives such as modified multi-wall carbon nanotubes. Modified geopolymers. The geopolymer of the invention has the characteristics of high compressive strength, good durability, good fluidity, good construction performance, good carbonization resistance and the like. The geopolymer of the present invention uses industrial waste such as urban solid waste combustion bottom ash as raw materials, which can not only save the environment, make full use of the utilization value of solid waste, but also reduce the production cost of the geopolymer, improve its carbonization capacity, and protect the environment. Reinforcement protective film to improve the durability of alkali-activated material concrete. The high carbonation resistance geopolymer of the present invention has the advantages of good water retention, short setting time, good durability and the like.

Description

technical field [0001] The invention relates to the technical field of geopolymer-based materials, in particular to a geopolymer with high carbonation resistance and a preparation method thereof. Background technique [0002] Geopolymer is a kind of alkali-aluminosilicate gelling material with amorphous three-dimensional network structure synthesized by silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron formed by aluminosilicate material and alkaline excitation reaction. Inorganic polymers. Research scholars at home and abroad have shown that alkali-activated concrete has a higher carbonation rate than cement concrete, and the accelerated carbonation will become more serious under the national standard. The carbonation of alkali-induced concrete not only leads to a decrease in compressive strength, but also causes a decrease in the pH value inside the alkali-induced concrete, which in turn causes damage to the protective film of the steel reinforcement, accelerates ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B111/20
CPCC04B28/04C04B2201/50C04B2111/20C04B2111/00017C04B14/026C04B14/106C04B18/146C04B18/0409C04B14/06C04B18/10C04B22/062C04B22/00
Inventor 李杉李发平卢亦焱陈得锋杨哲铭程志军
Owner WUHAN UNIV
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