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A 3D printing cement-based material for underwater construction and its preparation method

A cement-based material, 3D printing technology, applied in the direction of additive processing, sustainable waste treatment, solid waste management, etc., can solve the problems of collapse, poor anti-dispersion performance, etc., achieve small plastic deformation, good crack resistance, water and land The effect of high intensity ratio

Active Publication Date: 2019-08-06
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are no relevant research reports on underwater 3D printing buildings at home and abroad. The patent CN104891891B is a 3D printing cement-based material and its preparation method. It is composed of powdery cementitious materials and aggregates. The powdery cementitious materials are composed of Cement, active admixtures, water reducing agents, early strength agents, coagulation regulators, expansion agents, binders, air-entraining agents, plastic retaining agents, water-repellent agents, starch ethers, powder fillers and fibers, the 3D printing Cement-based materials have good working performance, buildability and mechanical properties, but the material has poor dispersion resistance in water and is only suitable for land construction. It will collapse when underwater construction, so the existing material composition must be carried out. Improvement to meet the needs of 3D printing materials for underwater construction

Method used

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  • A 3D printing cement-based material for underwater construction and its preparation method
  • A 3D printing cement-based material for underwater construction and its preparation method
  • A 3D printing cement-based material for underwater construction and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035]

[0036] Preparation method: Weigh various raw materials according to the formula, and add cement (P.II52.5 Portland cement), active admixture (ultrafine slag powder), water reducer (polycarboxylate water reducer) to the mixer in sequence ), early strength agent (sodium sulfate), coagulation regulator (sodium citrate), expansion agent (UEA expansion agent), air-entraining agent (saponin), anti-dispersion agent (polyacrylamide, welan gum), bonding Agent (redispersible latex powder), plastic retaining agent (hydroxyethyl cellulose ether), starch ether, fiber (polypropylene fiber) are fully stirred evenly to obtain powdery gelatinous material, which is packaged to form a product.

[0037] During on-site construction, weigh the fine aggregate (medium sand with a fineness modulus of 2.5) in proportion, put it into a special mixer and mix it evenly with the powdery cementitious material, add 120kg of water to the 1000kg mixture and mix evenly, and the printed concrete is pr...

Embodiment 2

[0039]

[0040]

[0041] Preparation method: Weigh various raw materials according to the formula, add cement (P.I 52.5 Portland cement), active admixtures (mineral powder, silica fume), water reducer (amino water reducer), early strength Agent (calcium formate), expansion agent (ZY concrete expansion agent), air-entraining agent (sodium lauryl sulfate), anti-dispersion agent (Welan gum), binder (redispersible latex powder), plastic retaining agent (Hydroxypropyl methylcellulose ether), starch ether, fiber (polypropylene fiber) are fully stirred evenly, and packaged to form a product.

[0042] During on-site construction, weigh the fine aggregate (quartz sand of 10-60 mesh) in proportion, put it into a special mixer and mix it evenly with the powdery cementitious material, add 130kg water to the 1000kg mixture and mix evenly, and make the printed concrete mixture , and the printing construction can be carried out. The material properties are shown in Table 1.

Embodiment 3

[0044]

[0045]

[0046] Preparation method: Weigh various raw materials according to the formula, and add cement (P.II52.5R Portland cement), active admixture (ultrafine slag powder, silicon powder), water reducer (polycarboxylic acid water reducer), early strength agent (sodium aluminate), expansion agent (UEA expansion agent), air-entraining agent (saponin), binder (redispersible latex powder), anti-dispersion agent (polyacrylamide), The plasticizer (hydroxyethyl cellulose), starch ether, and fiber (polypropylene fiber) are fully stirred evenly to obtain a powdery gelatinous material, which is packaged to form a product.

[0047] During on-site construction, weigh the fine aggregate (medium sand with a fineness modulus of 2.5) in proportion, put it into a special mixer and mix it with the powdery cementitious material, and add 110kg of water to the 1000kg mixture and mix it evenly to make printed concrete The mixture is ready for printing construction. The material p...

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Abstract

The invention relates to a 3D printing cement-based material used for underwater construction and a preparation method of the 3D printing cement-based material. The 3D printing cement-based material is prepared from the following components and raw materials by weight: 100 parts of cement, 0-60 parts of mineral powder, 0-30 parts of fly ash, 0-20 parts of silica fume, 0.1-3 parts of a water reducing agent, 0.1-5 parts of an anti-dispersion agent, 0.2-5 parts of a binder, 0.005-0.5 part of an air entraining agent, 0.01-25 parts of a plastic retaining agent, 0-0.5 part of starch ether, 0.01-0.5 part of a thickening time control agent, 0.1-10 parts of an expanding agent, 0.1-10 parts of an early strength agent, 0.01-0.5 part of fiber, 50-300 parts of fine aggregate, and 0-400 parts of coarse aggregate. Compared with the prior art, the 3D printing cement-based material, when used in the underwater printing construction, has the excellent advantages of constructability, dispersion resistance and durability and has an excellent bulk property in water, a printed building does not collapse, and the mechanical property is excellent.

Description

technical field [0001] The invention belongs to the technical field of civil engineering materials, and relates to a 3D printing cement-based material for underwater construction and a preparation method thereof, in particular to using cement as a cementitious material and mixing mineral admixtures, aggregates and various external materials. A 3D printing cement-based material for underwater construction prepared by using an agent and a preparation method thereof. Background technique [0002] 3D printing architectural technology is based on digital model files, using building materials suitable for 3D printing, and building technology by layer-by-layer printing. Compared with traditional construction technology, 3D printing construction technology has a series of significant advantages: fast construction speed, no need for templates, less labor demand, and reduced construction costs; high printing accuracy, complex buildings can be printed according to digital model files, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B28/08C04B28/02C04B28/06B33Y70/00C04B111/74
CPCB33Y70/00C04B28/021C04B28/04C04B28/06C04B28/08C04B2111/74C04B2201/10C04B2201/50C04B18/141C04B24/24C04B22/147C04B24/06C04B2103/0068C04B2103/304C04B24/2652C04B24/38C04B2103/0057C04B24/383C04B16/0633C04B14/06C04B18/146C04B2103/302C04B24/04C04B24/16C04B22/0093C04B2111/00181Y02W30/91C04B18/08C04B22/008C04B24/2647C04B2103/10C04B2103/30
Inventor 杨钱荣赵宗志
Owner TONGJI UNIV
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