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Alkali-activated gel material for 3D printing and its printing method

A 3D printing and cementitious material technology, applied in the field of alkali-activated cementitious materials and their preparation, can solve the problems of limited printing concrete height, printing process constraints, poor work performance, etc., and achieve green sustainable development and high early strength , good thermal stability

Active Publication Date: 2019-08-30
NANJING UNIV OF SCI & TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, alkali-activated gelling materials have fast coagulation speed, poor fluidity, and poor work performance, and 3D printing has high requirements for work performance, so the problem of using alkali-activated gelling materials for 3D printing needs to be solved urgently
Ordinary 3D printed concrete materials have low early strength, which is not enough to support the upper layer of materials, which limits the height of printed concrete and greatly restricts the printing process

Method used

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  • Alkali-activated gel material for 3D printing and its printing method
  • Alkali-activated gel material for 3D printing and its printing method
  • Alkali-activated gel material for 3D printing and its printing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Choose the blast furnace slag micropowder (basic index M of 25.8% by weight percentage b =1), put 20.7% coarse aggregate and 30.9% yellow sand fine aggregate into the mixer and mix well, add 0.08% carbon nanofiber to the mixture with 0.01% defoamer, 0.26% water reducer and 8.3% water Ultrasonic dispersion in the liquid and ultrasonic instrument for more than 10 minutes, then add it to the mixer, stir for 5-10 minutes, so that the solid raw material changes from a dispersed state to a viscous slurry state, and then add 9.81% steel fiber evenly to the slurry , a mixture slurry was obtained. Then the water glass solution (modulus is 1.5) and the mixture slurry are transferred to the arm of the printing stirring machine for stirring with a delivery pump. Through the program designed by the computer, the printing mixing robot arm is controlled to print concrete layer by layer until the printing process of the entire building is completed, and finally a 3D printed alkali-act...

Embodiment 2

[0033] Select Portland cement with a weight percentage of 2.9%, fly ash 26.6%, 23.6% coarse aggregate and 29.5% yellow sand fine aggregate and mix them in a mixer, add 0.14% silicon carbide fiber to dissolve 0.01% defoaming water-reducing agent, 0.15% water-reducing agent and 4.9% water, and ultrasonically disperse in an ultrasonic instrument for more than 10 minutes, then add it to the mixer and stir for 5-10 minutes to make the solid raw material change from a dispersed state to a viscous slurry state, and then uniformly add 9.88% steel fibers into the slurry to obtain a mixture slurry. Then the water glass (modulus is 1.8) and the mixture slurry are transferred to the arm of the printing mixer with a transfer pump for stirring. Through the program designed by the computer, the printing mixing robot arm is controlled to print concrete layer by layer until the printing process of the entire building is completed, and finally a 3D printed alkali-activated cementitious material...

Embodiment 3

[0036] Select 6.1% Portland cement by weight, 12.1% steel slag, 12.1% blast furnace slag powder (alkaline index M b =1), put 24.2% coarse aggregate and 33.4% yellow sand fine aggregate into the mixer and mix well, add 0.27% zirconia fiber into the mixture with 0.01% defoamer, 0.23% water reducing agent and 7.1% water Ultrasonic dispersion in the liquid and in an ultrasonic instrument for more than 10 minutes, stirring for 5-10 minutes, so that the solid raw material changes from a dispersed state to a viscous slurry state, and then 0.59% basalt fiber is evenly added to the slurry to obtain a mixture slurry. Then use the delivery pump to transfer the water glass (modulus 1.7) and the mixture slurry to the arm of the printing mixer for mixing. Through the program designed by the computer, the arm of the printing mixer is controlled to print concrete layer by layer until the printing process of the entire building is completed. , and finally get 3D printed alkali-inspired cementi...

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Abstract

The invention discloses an alkali-activated cementing material for 3D printing and a printing method of the alkali-activated cementing material. The alkali-activated cementing material consists of the following raw materials: industrial wastes, an alkali activating agent, fine aggregates, a defoaming agent, a water reduction agent, water, coarse aggregates, high-strength fiber and a micro nano material. A prepared slurry mixture is fed by two pumps and is printed and molded in a 3D printing mode. The problem that 3D printing concrete is low in early strength is solved, and the slurry properties of the alkali-activated cementing material are effectively improved; as the slurry is fed by two pumps, the problems that the alkali-activated cementing material is high in condensation rate and not applicable to 3D printing are solved; and due to doping of various fibers, final pressure and bending resistance of printed concrete is greatly improved.

Description

technical field [0001] The invention relates to an alkali-activated cementitious material and a preparation method thereof, in particular to an alkali-activated cementitious material concrete suitable for 3D printing technology. Background technique [0002] Alkali-activated cementitious materials mainly use blast furnace slag, granulated phosphorus slag, steel slag, fly ash and other industrial waste residues as raw materials. They have low energy consumption and low emissions, and are called green low-carbon cementitious materials. At the same time, this material also has many excellent properties such as high early strength, good durability, good thermal stability, etc., and is considered to be a new type of cementitious material with broad application prospects. Therefore, with the increasing attention to climate warming in recent years, the preparation and application technology of alkali-activated gelling materials has become a research hotspot and frontier in the fiel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B28/04B33Y70/00
Inventor 赖建中王强杨浩若郑晓博杨继全乔羽谭诚杨晓玉胡勇
Owner NANJING UNIV OF SCI & TECH
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