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Modified high-strength geopolymer cementing material and preparation method thereof

A technology of cementitious materials and geopolymers, which is applied in solid waste management, climate sustainability, sustainable waste treatment, etc., can solve the problem of low activity of waste concrete powder, can not fully stimulate potential activity, and does not meet practical engineering applications. and other problems, to achieve the effect of reducing the accumulation cost and the impact on the environment, breaking through the technical bottleneck, and reducing the breakthrough intensity.

Active Publication Date: 2021-11-30
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the activity of waste concrete powder is low, and its potential activity cannot be fully stimulated under alkali excitation, and the strength of the geopolymer synthesized by using it is low, which does not meet the practical engineering application.
At present, some scholars have carried out research on the preparation of geopolymer materials based on waste concrete, combined with fly ash or metakaolin, but most of them adopt high-temperature curing, and the strength of the obtained geopolymer is not very high. Easy to promote and apply

Method used

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  • Modified high-strength geopolymer cementing material and preparation method thereof
  • Modified high-strength geopolymer cementing material and preparation method thereof
  • Modified high-strength geopolymer cementing material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0040] A preparation method of a modified high-strength geopolymer gelling material, comprising the following steps:

[0041] Step S1: Prepare an alkali activator solution, weigh sodium silicate solution, sodium hydroxide solid and water, of which 220.31 g of sodium hydroxide solid analytical grade, 840 g of sodium silicate solution, and 192.69 g of water are fully mixed to form solution A; Add 210g nano-SiO to solution A 2 Dispersion liquid (the mass fraction of the nano-dispersion liquid is 0.06 of the precursor), stir evenly to form a solution B, seal the solution B through a polyethylene film, and let it stand for cooling; it should be noted that the above actual water consumption removes the nano-dispersion water in liquid;

[0042] Step S2: Configure the precursor, weigh 50 parts of waste concrete regenerated powder and 50 parts of blast furnace slag respectively, put the two in a mixer and mix evenly, set the speed of the mixer to 150r / min, and the mixing time to 120s;...

Embodiment 2

[0048] A preparation method of a modified high-strength geopolymer gelling material, comprising the following steps:

[0049] Step S1: Prepare an alkali activator solution, weigh sodium silicate solution, sodium hydroxide solid and water, of which 220.31 g of sodium hydroxide solid analytical grade, 840 g of sodium silicate solution, and 290.69 g of water are fully mixed to form solution A. Add 70g nano-SiO to solution A 2 The dispersion liquid (the quality of the nano-dispersion liquid is 0.02 of the precursor), stirred evenly to form a solution B, and the solution B was sealed through a polyethylene film, and left to cool;

[0050] Step S2: Configure the precursor, weigh 50 parts of waste concrete recycled powder, 40 parts of blast furnace slag and 10 parts of fly ash, put the three in a mixer and mix evenly, set the speed of the mixer to 150r / min, and the mixing time 120s;

[0051] Step S3: Prepare the geopolymer slurry, pour the prepared alkali activator solution contain...

Embodiment 3

[0056] A preparation method of a modified high-strength geopolymer gelling material, comprising the following steps:

[0057] Step S1: Prepare an alkali activator solution, weigh sodium silicate solution, sodium hydroxide solid and water, of which 220.31g of sodium hydroxide solid analytical grade, 840g of sodium silicate solution, and 171.69g of water are fully mixed to form solution A. Add 210g nanometer Al into solution A 2 o 3 Dispersion liquid (the quality of nano dispersion liquid is 0.06 of precursor), stir evenly, form solution B, solution B is sealed by polyethylene film, stand and cool;

[0058] Step S2: Configure the precursor, weigh 50 parts of waste concrete recycled powder and 50 parts of blast furnace slag, put the two in a mixer and stir evenly, set the speed of the mixer to 150r / min, and the mixing time to 120s;

[0059] Step S3: Prepare the geopolymer slurry, pour the prepared alkali activator solution containing nanomaterials (ie solution B) into the unifo...

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Abstract

The invention relates to a modified high-strength geopolymer cementing material and a preparation method thereof. The geopolymer cementing material is prepared by using waste concrete regenerated powder, blast furnace slag and fly ash as precursors, using a nano SiO2 aqueous dispersion or a nano Al2O3 aqueous dispersion for modification, and using a mixed solution of a sodium silicate solution and sodium hydroxide as an alkali activator. The waste powder generated in the waste concrete recycling process is consumed to prepare the geopolymer cementing material with high strength under the normal-temperature curing condition. The geopolymer cementing material is a green building material, and has the advantages of being high in early strength, excellent in durability and the like. High-added-value utilization of the waste concrete powder is achieved. The preparation method is also simple and easy to operate and has a wide application prospect.

Description

technical field [0001] The invention relates to a modified high-strength geopolymer gelling material and a preparation method thereof, and belongs to the technical fields of solid waste resource utilization and geopolymer material preparation. Background technique [0002] With the development of the national economy and the vigorous advancement of the urbanization process, a large number of concrete buildings (structures) that do not meet the requirements for use have been demolished or reconstructed, resulting in a huge amount of waste concrete. In the process of recycling waste concrete to produce recycled aggregate, a large amount of fine powder will be produced, accounting for about 15% to 20% of the total concrete waste. Most of this part of waste is directly transported to the outer suburbs for stacking or filling. Buried, this extensive treatment method not only consumes a large amount of land resources and high treatment costs, but also causes air pollution due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B40/02
CPCC04B28/006C04B2201/50C04B2111/00017C04B22/00C04B22/062C04B14/06C04B18/16C04B18/141C04B40/0281C04B18/08C04B14/303Y02W30/91
Inventor 朱志铎霍王文张杰康转转
Owner SOUTHEAST UNIV
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