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Coarse aggregate concrete ink material for 3D printing and application thereof

A 3D printing and coarse aggregate technology, applied in the direction of additive processing, etc., can solve the problems of easy cracking cost, low flexural strength, easy to break, etc., to improve water retention, increase cementation strength, and reduce pumping resistance Effect

Inactive Publication Date: 2019-09-13
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the main aggregate of widely used concrete 3D printing materials is fine aggregate, that is, sand, which can achieve limited strength, large shrinkage, easy cracking and high cost, which cannot meet the needs of the current civil engineering industry to build ultra-high and ultra-long spans. , The direction demand of super-large volume form buildings, so the long-term development of concrete 3D printing ink materials containing coarse aggregate urgently needs materials with high strength and low cost
At present, the concrete layer produced by concrete 3D printing has low single-layer flexural strength and is prone to fracture inside. Excellent cementing ability and should not have too many early cracks

Method used

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  • Coarse aggregate concrete ink material for 3D printing and application thereof
  • Coarse aggregate concrete ink material for 3D printing and application thereof
  • Coarse aggregate concrete ink material for 3D printing and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A coarse aggregate concrete ink material for 3D printing, which comprises the following components by weight percentage: 31% (27.14kg) Portland cement, 2% (1.75kg) silica fume, 2% (1.75kg) Limestone powder, 18.7% (17.86kg continuous grading) sand, 45.3% (39.66kg, continuous grading) 5-20mm particle size stones (continuous grading), 0.5% (0.44kg) PCA (Ⅶ) high performance water reducing Agent, 0.45% (0.39kg) polypropylene fiber, 0.05% (43.8g) water retention thickener propyl methyl cellulose ether.

[0027] in:

[0028] Portland cement has a specific surface area of ​​355m 2 / kg.

[0029] The specific surface area of ​​silica fume is 20000m 2 / kg, the specific surface area of ​​limestone powder is 330m 2 / kg.

[0030] The particle size of the sand ranges from 0.35 to 0.5 mm.

[0031] The particle size of the stones ranges from 5 to 20 mm.

[0032] The water reducer is PCA (Ⅶ) high-performance polycarboxylate water reducer with a solid content of 30% to 40%.

[003...

Embodiment 2

[0039] A coarse aggregate concrete ink material for 3D printing, the material includes the following components according to weight percentage: 33.5% (29.33kg) Portland cement, 5% (4.38kg) silica fume, 5% (4.38kg) Limestone powder, 18.7% (16.37kg continuous grading) sand, 36.7% (32.13kg, continuous grading) 5-20mm particle size stones (continuous grading), 0.5% (0.44kg) PCA (Ⅶ) high performance water reducing Agent, 0.59% (0.52kg) polypropylene fiber, 0.01% (8.8g) water retention thickener propyl methyl cellulose ether.

[0040] in:

[0041] Portland cement has a specific surface area of ​​355m 2 / kg.

[0042] The specific surface area of ​​silica fume is 20000m 2 / kg, the specific surface area of ​​limestone powder is 330m 2 / kg.

[0043] The particle size of the sand ranges from 0.35 to 0.5mm.

[0044] The particle size of the stones ranges from 5 to 20mm.

[0045] The water reducer is PCA (Ⅶ) high-performance polycarboxylate water reducer with a solid content of 30% ...

Embodiment 3

[0052] A coarse aggregate concrete ink material for 3D printing, which comprises the following components by weight percentage: 44% (38.5kg) Portland cement, 2% (1.75kg) silica fume, 2% (1.75kg) Limestone powder, 24.4% (21.36kg continuous grading) sand, 26.4% (23.11kg, continuous grading) 5-20mm particle size stones (continuous grading), 1% (0.88kg) PCA (Ⅶ) high performance water reducing Agent, 0.1% (87.5g) polypropylene fiber, 0.1% (87.6g) water retention thickener propyl methyl cellulose ether.

[0053] in:

[0054] Portland cement has a specific surface area of ​​355m 2 / kg.

[0055] The specific surface area of ​​silica fume is 20000m 2 / kg, the specific surface area of ​​limestone powder is 330m 2 / kg.

[0056] The particle size of the sand ranges from 0.35 to 0.5mm.

[0057] The particle size of the stones ranges from 5 to 20mm.

[0058] The water reducer is PCA (Ⅶ) high-performance polycarboxylate water reducer with a solid content of 30% to 40%.

[0059] The f...

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Abstract

The invention discloses a coarse aggregate concrete ink material for 3D printing and an application thereof. The material comprises the following components in percentage by weight: 31%-44% of cement,2%-10% of a mineral admixture, 0.1%-2% of fibers, 18.7%-45.3% of sand, 20.3%-45.3% of gravel, 0.1%-1% of a water reducer and 0.01%-0.1% of a water-retaining thickener. The coarse aggregate concrete ink material and mixing water are uniformly stirred for 3D printing of buildings. According to the invention, the skeleton and filling effects of the gravel are utilized, shrinkage of concrete is inhibited, and strength of a concrete wet blank is remarkably improved. Requirements of pumping and printing on a concrete material can be both taken into consideration, and the phenomenon of gushing or blockage during pumping before printing can be avoided. After printing, sufficient wet blank strength is achieved, and standing performance is achieved. In addition, tearing and early-stage cracks of aconcrete layer can be avoided through good cementing strength and good internal fiber drawing effect of the coarse aggregate concrete ink material.

Description

technical field [0001] The invention relates to a coarse aggregate concrete ink material for 3D printing and its application, belonging to the technical field of building materials. Background technique [0002] 3D printing technology is a new type of rapid prototyping and additive manufacturing technology that integrates mathematics, information, machinery, materials and chemistry. Its practical application can greatly save labor costs, energy and resources and improve the accuracy of processed products. And efficiency, thus significantly changing the production mode of the manufacturing industry, is one of the important technical signs in the third industrial revolution. In February 2015, my country issued the "National Additive Manufacturing Industry Development Promotion Plan (2015-2016)" to upgrade additive manufacturing to a national strategy. In August 2016, the Ministry of Housing and Urban-Rural Development's "2016-2020 Construction Industry Informatization Develop...

Claims

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Application Information

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IPC IPC(8): C04B28/04B33Y70/00
CPCB33Y70/00C04B28/04C04B2111/00181C04B2201/50C04B18/146C04B14/28C04B14/06C04B14/02C04B24/24C04B16/0633C04B24/383
Inventor 张云升陈逸东张宇乔宏霞石加顺钱佳佳
Owner SOUTHEAST UNIV
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