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Gypsum-based 3D printing mortar and preparation method thereof

A 3D printing, gypsum-based technology, applied in the field of building material engineering, can solve the problems of irregular shape, environmental burden, difficult cement concrete, etc., to achieve the effect of good thermal insulation and sound insulation, improve recycling rate, and reduce environmental burden.

Pending Publication Date: 2021-11-23
BUILDERA CONSTR TECH SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Circulating fluidized bed fly ash is different from ordinary fly ash in chemical composition, mineral composition, and performance. Circulating fluidized bed fly ash has coarse particles, irregular shape, f-CaO and SO 3 High content, and anhydrite and lime as the main mineral composition, most of them do not meet the existing technical standards and usage specifications, so it is difficult to be directly applied in cement concrete
Therefore, the utilization rate of circulating fluidized bed fly ash has been very low, which still imposes a heavy burden on the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment provides a preparation method of gypsum-based 3D printing mortar, comprising the following steps:

[0030] S1 pretreatment: Grinding the circulating fluidized bed fly ash, preferably until the specific surface area is 500-600㎡ / kg.

[0031] The circulating fluidized bed fly ash is the fly ash collected in the flue of the circulating fluidized bed boiler. The particles of the circulating fluidized bed fly ash are relatively coarse, mainly irregular particles, f-CaO and SO 3 The content is high, and because it adopts the calcium injection desulfurization method, the circulating fluidized bed fly ash contains a large amount of unreacted desulfurization agent lime and desulfurization product anhydrite. The circulating fluidized bed fly ash is ground until its specific surface area is 500-600㎡ / kg, the higher the specific surface area of ​​the circulating fluidized bed fly ash, the greater the reactivity, and the circulating fluidized bed fly ash The ash is gr...

Embodiment 2

[0048] This embodiment provides a preparation method of gypsum-based 3D printing mortar, comprising the following steps:

[0049] S1 pretreatment: Grinding the circulating fluidized bed fly ash, preferably until the specific surface area is 500-600㎡ / kg.

[0050] S2 Preparation of gelling material: Mix and stir the pulverized circulating fluidized bed fly ash with desulfurized gypsum, natural gypsum, calcium hydroxide and microsilica until uniform, to obtain a gelling material, wherein the circulating fluidized bed pulverized coal The parts by weight of the ash is 14 parts, and the SO in the desulfurization gypsum 3 The content is 55%, the parts by weight is 20 parts, SO in natural gypsum 3 The content of the content is 60%, the parts by weight is 15 parts, the parts by weight of calcium hydroxide is 2 parts, microsilica fume SiO 2 The content is more than 90%, and the specific surface area is 15000-20000m 2 / kg, parts by weight are 4 parts.

[0051] S3 Preparation of dry p...

Embodiment 3

[0056] This embodiment provides a preparation method of gypsum-based 3D printing mortar, comprising the following steps:

[0057] S1 pretreatment: Grinding the circulating fluidized bed fly ash, preferably until the specific surface area is 500-600㎡ / kg.

[0058] S2 Preparation of gelling material: Mix and stir the pulverized circulating fluidized bed fly ash with desulfurized gypsum, natural gypsum, calcium hydroxide and microsilica until uniform, to obtain a gelling material, wherein the circulating fluidized bed pulverized coal The parts by weight of ash is 10 parts, the SO in desulfurization gypsum 3 The content is 50%, the parts by weight is 18 parts, SO in natural gypsum 3 The content of the content is 55%, and the parts by weight is 12 parts, and the parts by weight of calcium hydroxide is 1.5 parts, and microsilica fume SiO 2 The content is more than 90%, and the specific surface area is 15000-20000m 2 / kg, parts by weight are 3.5 parts.

[0059] S3 Preparation of d...

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Abstract

The invention discloses gypsum-based 3D printing mortar and a preparation method thereof. The gypsum-based 3D printing mortar comprises the following components in parts by weight: 10-15 parts of circulating fluidized bed fly ash, 15-22 parts of SO3 in gypsum, 45-55 parts of sand, 1-2 parts of calcium hydroxide, 3-4 parts of silica fume, 10-15 parts of water, lignin fibers and a dispersing agent. The preparation method of the gypsum-based 3D printing mortar sequentially comprises a circulating fluidized bed fly ash grinding pretreatment step, a cementing material preparation step, a dry powder preparation step and a printing mortar preparation step. The industrial waste circulating fluidized bed fly ash is fully utilized, the environment burden caused by the industrial waste circulating fluidized bed fly ash is reduced, and the prepared 3D printing mortar is excellent in performance.

Description

technical field [0001] The invention relates to the technical field of building material engineering, in particular to a gypsum-based 3D printing mortar and a preparation method thereof. Background technique [0002] With the further strengthening of environmental protection requirements, the comprehensive utilization of various industrial wastes has received extensive attention. High-quality fly ash and slag are widely used in the cement concrete industry and become scarce resources. [0003] Circulating fluidized bed fly ash is different from ordinary fly ash in chemical composition, mineral composition, and performance. Circulating fluidized bed fly ash has coarse particles, irregular shape, f-CaO and SO 3 Most of them do not meet the existing technical standards and usage specifications, so they are difficult to be directly applied in cement concrete. Therefore, the utilization rate of CFB fly ash has been very low, and it still imposes a heavy burden on the environmen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14B33Y70/10C04B18/08
CPCC04B28/144B33Y70/10C04B18/08C04B2111/00181C04B2201/50C04B22/143C04B14/06C04B16/02C04B18/146C04B2103/408C04B22/064Y02W30/91
Inventor 蒋旭峰
Owner BUILDERA CONSTR TECH SHANGHAI CO LTD
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