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3D printing cement-based material used for underwater construction and preparation method thereof

A cement-based material, 3D printing technology, used in additive processing, sustainable waste treatment, solid waste management, etc., can solve problems such as collapse and poor dispersion resistance, and achieve small plastic deformation, good crack resistance, and adhesion. Good junction performance

Active Publication Date: 2017-11-03
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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  • 3D printing cement-based material used for underwater construction and preparation method thereof
  • 3D printing cement-based material used for underwater construction and preparation method thereof
  • 3D printing cement-based material used for underwater construction and preparation method thereof

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 (ultra-fine slag powder), and water reducer (polycarboxylic acid water reducer) in the mixer. ), early strength agent (sodium sulfate), coagulant (sodium citrate), expansion agent (UEA expansion agent), air-entraining agent (saponin), anti-dispersant (polyacrylamide, welan gum), adhesive Mixing agent (re-dispersible latex powder), plasticizer (hydroxyethyl cellulose ether), starch ether, and fiber (polypropylene fiber) thoroughly to obtain a powdery gelling material, which is packaged to form a product.

[0037] During the on-site construction, weigh the fine aggregate (medium sand with a fineness modulus of 2.5) into a special mixer and mix it with the powdery cementitious material. According to the 1000kg mixture, add 120kg of water and mix it evenly to produce printed concrete The mixture can be printed and constructed. The mate...

Embodiment 2

[0039]

[0040]

[0041] Preparation method: Weigh various raw materials according to the formula, and add cement (PI 52.5 Portland cement), active admixtures (slag powder, silica fume), water reducing agent (amino water reducing agent), and early strength in the mixer. Agent (calcium formate), expansion agent (ZY concrete expansion agent), air-entraining agent (sodium lauryl sulfate), anti-dispersant (Welan gum), binder (re-dispersible latex powder), plastic preservative (Hydroxypropyl methyl cellulose ether), starch ether, and fiber (polypropylene fiber) are thoroughly stirred and packaged to form a product.

[0042] During on-site construction, weigh the fine aggregate (10-60 mesh quartz sand) into a special mixer and mix it evenly with the powdery cementitious material. Add 130kg of water to 1000kg of the mixture and mix evenly to prepare a printed concrete mixture. , You can print and construct. The material properties are shown in Table 1.

Embodiment 3

[0044]

[0045]

[0046] Preparation method: Weigh various raw materials according to the formula, add cement (P.II52.5R Portland cement), active admixtures (ultrafine slag powder, silica fume), and water reducer (polycarboxylic acid Water reducing agent), early strength agent (sodium aluminate), expansion agent (UEA expansion agent), air-entraining agent (saponin), binder (re-dispersible latex powder), anti-dispersant (polyacrylamide), The plasticizer (hydroxyethyl cellulose), starch ether, and fiber (polypropylene fiber) are fully stirred evenly to obtain a powdered gelling 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) into a special mixer and mix it with the powdery cementitious material evenly, add 110kg of water to 1000kg of the mixture and mix it evenly to produce printed concrete The mixture can be printed and constructed. The material properties are shown in Table...

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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, and in particular to the use of cement as a cementitious material while mixing with mineral admixtures, aggregates and various additives A 3D printing cement-based material for underwater construction and a preparation method thereof. Background technique [0002] 3D printing building technology is based on digital model files, using building materials suitable for 3D printing to construct buildings by printing layer by layer. Compared with traditional construction technology, 3D printing construction technology has a series of significant advantages: construction speed is fast, no template is required, labor demand is small, and construction cost is reduced; high printing accuracy, complex buildings can be printed according to digital model files to realize construction...

Claims

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Application Information

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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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