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3D printing cement-based material and preparation method thereof

A cement-based material, 3D printing technology, applied in the field of building materials, can solve the problems of poor extrusion performance and buildability, affecting the connection performance between printing layers and layers, hidden dangers in construction safety, etc., to improve work performance, excellent buildability Good performance and construction performance

Active Publication Date: 2015-09-09
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this patent tests some conventional properties of cement-based materials such as setting time, compressive strength and vertical expansion rate, these properties are difficult to truly reflect the construction performance and buildability of printed materials in new construction methods, such as this material Sulphoaluminate cement is used as the main cementitious material, which can make the material have high early strength and rapid setting function. The setting time of the material is adjusted by the composite coagulant to make the setting time within the range of 10-60min. For In terms of general rapid method construction, it can basically meet the construction requirements, but for extrusion method printing construction, due to the rapid loss of fluidity of sulphoaluminate cement paste, it will lead to poor extrusion performance and buildability, and the material is extremely poor. It is easy to cause blockage during transportation and printing, and it will also seriously affect the connection performance between the printing layers, causing many defects between the printing layers and leaving a safety hazard for the building

Method used

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  • 3D printing cement-based material and preparation method thereof
  • 3D printing cement-based material and preparation method thereof
  • 3D printing cement-based material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046]

[0047]

[0048] Character alignment preparation method: Weigh various raw materials according to the formula, and add cement (P.II52.5R Portland cement), active admixture (ultrafine slag powder), water reducing agent (polycarboxylic acid reducing Water agent), early strength agent (calcium formate), coagulant (sodium citrate), expansion agent (UEA expansion agent), binder (re-dispersible latex powder), air-entraining agent (saponin), plastic preservation Mixing agent (carboxymethyl cellulose), starch ether and fiber (polypropylene fiber) thoroughly to obtain a powdered gelling material, which is packaged to form a product.

[0049] During on-site construction, weigh the fine aggregate (medium sand with a fineness modulus of 2.5) and coarse aggregate (the crushed stone with a smaller particle size of 10mm) into a special mixer and mix it with the powdery cementitious material in proportion, and mix according to 1000kg Add 110kg of water to the material and mix evenly to p...

Embodiment 2

[0052]

[0053]

[0054] Preparation method: Weigh various raw materials according to the formula, and sequentially add cement (PO 42.5 ordinary cement), active admixtures (fine slag powder, fly ash), and water reducing agent (naphthalene water reducing agent) into the mixer, early strength Agent (sodium metasilicate), coagulant (sodium citrate), expansion agent (ZY concrete expansion agent), binder (re-dispersible latex powder), air-entraining agent (sodium lauryl sulfate), protector Plasticizer (lignocellulose), water repellent (calcium stearate), starch ether, and fiber (basalt fiber) are fully mixed and packaged to form a product.

[0055] During on-site construction, weigh the fine aggregate (10-60 mesh quartz sand) and coarse aggregate (grained stone with a particle size of less than 10mm) into a special mixer and mix it with the powdered cementing material according to the proportion, and add it to the 1000kg mixture Stir 120kg of water evenly to make a printing concrete m...

Embodiment 3

[0058]

[0059]

[0060] 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, quicklime), binder (re-dispersible latex powder), air-entraining agent (saponin), plasticizer (methyl hydroxyl Propyl cellulose ether), water repellent (calcium stearate), starch ether, and fiber (polypropylene fiber) are fully stirred evenly to obtain a powdered gelling material, which is packaged to form a product.

[0061] During on-site construction, weigh the fine aggregate (medium sand with a fineness modulus of 2.5) and coarse aggregate (the crushed stone with a smaller particle size of 10mm) into a special mixer and mix it with the powdery cementitious material in proportion, and mix according to 1000kg Add 105kg of water to the material and ...

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Abstract

The invention relates to a 3D printing cement-based material and a preparation method thereof. The 3D printing cement-based material is composed of a powder form gelling material and an aggregate, the powder form gelling material is composed of cement, an active admixture, a water reducer, a hardening accelerator, an adjustable solidification agent, an expanding agent, a binder, an air-entrainer, a plasticity-maintaining agent, a water repellent, starch ether, a powder filling material and fiber, and the aggregate is composed of a fine aggregate and a crude aggregate. Compared with prior art, the 3D printing cement-based material has the advantages of good work performance, constructability performance, mechanical property and endurance performance.

Description

Technical field [0001] The invention belongs to the technical field of building materials, and particularly relates to a 3D printing cement-based material and a preparation method thereof. Background technique [0002] 3D printing technology is based on digital model files, using powdered metal or plastic and other bondable materials to construct objects by printing layer by layer. Now, 3D printing technology has begun to try to be used in the construction of houses. Compared with traditional building technology, the advantages of 3D printing building technology are reflected in: fast speed-can be more than 10 times faster than traditional building technology; it can create complex and diverse buildings that are difficult to build in traditional methods, and it does not require the use of templates, which reduces the building Cost; does not require a large number of construction workers, which reduces the safety risks in construction; and reduces waste by-products, which can eff...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B28/08C04B14/02
Inventor 杨钱荣刘巧玲
Owner TONGJI UNIV
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