Low-shrinkage 3D printing concrete co-doped with lignin fibers and preparation method of low-shrinkage 3D printing concrete

A lignin fiber, 3D printing technology, used in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve problems such as deficiencies, severe shrinkage cracking, and inability to 3D print the improvement of interlayer bonding properties of concrete. Achieve the effect of optimizing printability, improving interlayer adhesion, and improving early crack resistance

Active Publication Date: 2021-09-10
HEBEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the unique molding process, 3D printed concrete faces a more serious risk of shrinkage cracking than ordinary pouring mode concrete
However, the application of expansion agents in 3D printed concrete is still lacking, and expansion agents cannot improve the interlayer bonding properties of 3D printed concrete

Method used

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  • Low-shrinkage 3D printing concrete co-doped with lignin fibers and preparation method of low-shrinkage 3D printing concrete
  • Low-shrinkage 3D printing concrete co-doped with lignin fibers and preparation method of low-shrinkage 3D printing concrete
  • Low-shrinkage 3D printing concrete co-doped with lignin fibers and preparation method of low-shrinkage 3D printing concrete

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preparation example Construction

[0036] The present invention also provides a method for preparing low-shrinkage 3D printed concrete compounded with lignin fibers (method for short), characterized in that the method comprises the following steps:

[0037] (1) Mix the dry materials of high belite sulfoaluminate cement, ordinary portland cement, lignin fiber, UEA expansion agent, silica fume and quartz sand to obtain a composite cement-based material;

[0038] Add the thickener and the polycarboxylate water reducer into the water, and stir evenly to obtain a mixed aqueous solution;

[0039] (2) Mix the composite cement-based material with the mixed aqueous solution to obtain low-shrinkage 3D printed concrete compounded with lignin fibers.

[0040] Preferably, in step (1), the mixing equipment of high belite sulfoaluminate cement, ordinary Portland cement, lignin fiber, UEA expansion agent, silica fume and quartz sand is a concrete mixer, and the mixing time is 3- 5min; the mixing time of thickener, polycarboxyla...

Embodiment 1

[0052] In Example 1, the low-shrinkage 3D printed concrete compounded with lignin fibers includes the following components in parts by weight: 0.05 parts of high belite sulfoaluminate cement, 0.9 parts of ordinary portland cement, and 0.02 parts of lignin fibers 0.05 parts of UEA expansion agent, 0.12 parts of silica fume, 1.2 parts of quartz sand, 0.4 parts of water, 0.001 parts of thickener and 0.002 parts of polycarboxylate water reducer.

[0053] The strength grade of the high belite sulfoaluminate cement is 42.5, the particle size is 0.1-632.5 μm, the initial setting time is ≥ 30 minutes, and the final setting time is ≤ 90 minutes. The strength grade of the ordinary Portland cement is 42.5, the particle size is 0.2-355.7 μm, the initial setting time is ≥ 50 minutes, and the final setting time is ≤ 560 minutes. The density of the lignin fiber is 0.8g / cm 3 , The saturated water absorption rate is 200%. The 14-day water curing limit swelling rate of the UEA swelling agent ...

Embodiment 2

[0060] In Example 2, the low-shrinkage 3D printed concrete compounded with lignin fibers includes the following components in parts by weight: 0.05 parts of high belite sulfoaluminate cement, 0.9 parts of ordinary portland cement, and 0.04 parts of lignin fibers 0.05 parts of UEA expansion agent, 0.12 parts of silica fume, 1.2 parts of quartz sand, 0.4 parts of water, 0.001 parts of thickener and 0.002 parts of polycarboxylate water reducer.

[0061] The strength grade of the high belite sulfoaluminate cement is 42.5, the particle size is 0.1-632.5 μm, the initial setting time is ≥ 30 minutes, and the final setting time is ≤ 90 minutes. The strength grade of the ordinary Portland cement is 42.5, the particle size is 0.2-355.7 μm, the initial setting time is ≥ 50 minutes, and the final setting time is ≤ 560 minutes. The density of the lignin fiber is 0.8g / cm 3 , The saturated water absorption rate is 200%. The 14-day water curing limit swelling rate of the UEA swelling agent ...

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Abstract

The invention discloses low-shrinkage 3D printing concrete co-doped with lignin fibers and a preparation method of the low-shrinkage 3D printing concrete. The concrete comprises the following components: high belite sulphoaluminate cement, ordinary Portland cement, lignin fibers, a UEA expanding agent, silica fume, quartz sand, water and an additive. The lignin fibers are applied to the 3D printing concrete for the first time, the effects of internal curing and fiber toughening are achieved, shrinkage deformation of the 3D printing concrete in all ages can be effectively reduced, the early-stage cracking resistance is improved, the interlayer bonding performance of the 3D printing concrete is effectively improved, and meanwhile the humidity balance of a concrete material can be adjusted. The high belite sulphoaluminate cement and the ordinary Portland cement are mixed according to a proper proportion to serve as a cementing material of the 3D printing concrete. The printability of the concrete can be optimized and the early strength of the concrete can be improved due to the characteristics of quick setting and early strength of the high belite sulphoaluminate cement, and the shrinkage deformation of the 3D printing concrete in the later period can be reduced due to the characteristic of low shrinkage.

Description

technical field [0001] The invention relates to the field of civil engineering materials, in particular to a low-shrinkage 3D printing concrete compounded with lignin fibers and a preparation method thereof. Background technique [0002] 3D printing technology is a new processing technology based on the principle of additive manufacturing, and it has been widely used in the field of civil engineering in recent years. Compared with traditional construction methods, 3D printing construction technology has a fast construction speed, no longer needs to use templates and a large number of construction workers, and can easily print out curved buildings that are difficult to construct by other methods, greatly improving production efficiency and low cost. Carbon, green, environmental protection and other characteristics. Studies have shown that the use of 3D printing construction technology can reduce the generation of construction waste by 30-60%, and can save 50-80% of labor cos...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B18/26B33Y10/00B33Y70/10
CPCC04B28/06C04B18/26B33Y10/00B33Y70/10C04B2201/50C04B7/02C04B18/146C04B14/06C04B2103/44C04B2103/302Y02W30/91
Inventor 马国伟胡元元王里徐萍姚亮
Owner HEBEI UNIV OF TECH
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