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Fly ash geopolymer concrete and preparation method thereof

A technology of fly ash and geopolymer, applied in cement production and other directions, can solve problems such as environmental pollution, land occupation, energy and resource waste, and achieve good mechanical properties, strong corrosion resistance and good durability.

Active Publication Date: 2019-09-20
神木市万盛隆能源发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Fly ash is a by-product produced by thermal power plants. At present, the annual discharge of fly ash in my country is close to 300 million tons, but less than half of the fly ash is used. A large amount of fly ash not only occupies land, but also causes serious environmental problems. Pollution, causing huge waste of energy and resources
[0010] Usually, researchers in the prior art focus on the modification of geopolymer concrete mostly on the compressive and shrinkage resistance properties, but pay less attention to its anti-corrosion properties

Method used

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  • Fly ash geopolymer concrete and preparation method thereof
  • Fly ash geopolymer concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Preparation of embodiment 1 fly ash geopolymer concrete

[0036] The metakaolin used in the present invention is prepared by calcining kaolin at 700° C. for 12 hours, and the chemical composition of metakaolin is as shown in the table below:

[0037] Table 1 Chemical composition of metakaolin

[0038] Element SiO 2

Al 2 o 3

Fe 2 o 3

CaO TiO 2

MnO K 2 o

P 2 o 5

SO 3

MgO content% 64.9 26.6 3.7 0.9 1.8 0.1 0.8 0.9 - -

[0039] The fly ash used in the present invention is a thermal power plant industrial grade F class first-level dry ash, and the chemical composition of the fly ash is shown in the following table:

[0040] Table 2 Chemical composition of fly ash

[0041] Element SiO 2

Al 2 o 3

Na 2 o

CaO Fe 2 o 3

MgO SO 3

K 2 o

TiO 2

P 2 o 5

Cl -

MnO content% 39.4 32.7 7.9 6.0 3.9 2.3 2.1 2.0 0.6 0.8 0.5...

Embodiment 2

[0047] Preparation of embodiment 2 fly ash geopolymer concrete

[0048] S1: The preparation method of modified ceramic microsphere particles is the same as that in Example 1;

[0049] S2: The preparation method of the basic activator is the same as in Example 1;

[0050] S3: first mix 200 parts of fly ash and 200 parts of metakaolin in a mixer, add the alkaline activator prepared in step S2 and 7.5 parts of polycarboxylate water reducer, stir well, and add 20 parts of polyacrylonitrile fiber , mix and stir;

[0051] S4: The preparation of geopolymer concrete is the same as in Example 1.

Embodiment 3

[0079] Example 3 Optimization of Fly Ash Content in Fly Ash Geopolymer Concrete

[0080] S1: The preparation method of modified ceramic microsphere particles is the same as that in Example 1;

[0081] S2: The preparation method of the basic activator is the same as in Example 1;

[0082] S3: The preparation method of the geopolymer gel material is the same as in Example 1. In order to screen the optimum amount of fly ash, a total of 400 parts of fly ash and metakaolin are used to set the proportion of fly ash to 0, 10%, and 30% respectively. %, 50%, 70%, 90%, 100%, a total of 7 groups of tests;

[0083] S4: The preparation of geopolymer concrete is the same as in Example 1.

[0084] According to GB / T 50081-2002 "Standards for Test Methods of Mechanical Properties of Ordinary Concrete", the test specimens were prepared with a size of 100mm×100mm×100mm. After 28 days of standard curing, the compressive strength of the geopolymer concrete specimens was tested. , flexural stren...

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Abstract

The invention discloses fly ash geopolymer concrete. The concrete is prepared by taking fly ash and metakaolin as base materials, taking one or more than two of sodium hydroxide, potassium hydroxide, sodium silicate and potassium silicate as well as water glass as alkaline activators, and adding modified ceramic microsphere particles, polymer fibers, coarse aggregates, fine aggregates and water. The fly ash geopolymer concrete has good mechanical properties, high durability and high corrosion resistance.

Description

technical field [0001] The invention belongs to the technical field of concrete materials, and in particular relates to a fly ash geopolymer concrete and a preparation method thereof. Background technique [0002] Ancient concrete and mortar buildings, such as the Egyptian pyramids and the Roman Colosseum, have excellent durability. They can survive thousands of years or even tens of thousands of years without being damaged in relatively harsh environments. In contrast, under the same external conditions, the average lifespan of modern concrete prepared with Portland cement is only 40-50 years, and the longest is no more than 100 years, and it will suffer serious damage in just a few years. The reason is that in the durable concrete there is an amorphous substance that does not exist in Portland cement. The structure of this substance is similar to the three-dimensional frame structure of organic polymers, but its main body is inorganic. SiO 4 and AlO 4 Tetrahedron, Frenc...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B111/20
CPCC04B28/006C04B2111/20C04B2201/50C04B24/26C04B14/062C04B18/023C04B22/08C04B22/00C04B18/08C04B14/106C04B14/28C04B14/06C04B14/02C04B16/0658C04B2103/61Y02P40/10
Inventor 马清浩
Owner 神木市万盛隆能源发展有限公司
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