Concrete material for 3D printing, and preparation method thereof

A technology of concrete and cementitious materials, applied in the direction of manufacturing tools, additive processing, ceramic molding machines, etc., can solve the problems of low material performance, structural damage, and apparent unevenness

Active Publication Date: 2018-12-18
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the unique problem of 3D printing concrete material exposure has gradually attracted the attention of scholars at home and abroad. The main engineering technical problem is the use of concrete as "ink" for 3D printing of architectural structures. The low bonding strength of the interlayer interface formed between the strips, as well as the poor overall performance and uneven appearance of the 3D printed products, all of which reduce the safety and applicability of 3D printed concrete materials and prepared components, and greatly limit the Promotion and Application of 3D Printing Concrete in Building Structure
In particular, previous studies have shown that due to the low bond strength between layers of 3D printing "ink", the shear resistance is poor, and structural damage is prone to occur under earthquake or shear loads. important problems to solve

Method used

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  • Concrete material for 3D printing, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0127] According to the formula ratio of concrete materials, measure and take 1.0 parts of cementitious material, 2.0 parts of natural fine aggregate, 0.012 parts of nano-silica, 0.025 parts of high elastic modulus polyethylene fiber, 0.01 part of redispersible latex powder, and 0.0005 parts of lignocellulose Stir for 2 minutes for the first time to obtain a premix; at the same time, measure and take 0.4 parts of water and 0.012 parts of thickening and superplasticizer to stir and mix for 2 minutes to obtain a mixture; then add the mixture to the premix for Stir for the second time for 3 minutes to obtain the final mixture. The slump of the final mixture is 25mm, which is the required concrete material sample 1# for 3D printing. Among them, the cementitious material is a mixture of cement and fly ash, and the mass ratio of cement and fly ash is 1:1. The cement is selected from Portland cement or ordinary Portland cement, and the strength grade of the cement is 42.5. The class...

Embodiment 2

[0131] According to the formula ratio of concrete materials, measure and take 1.0 parts of cementitious material, 1.5 parts of natural fine aggregate, 0.015 parts of nano-silica, 0.03 parts of high elastic modulus polyethylene fiber, 0.008 parts of redispersible latex powder, and 0.0008 parts of lignocellulose Stir for 3 minutes for the first time to obtain a premix; at the same time, measure and take 0.5 parts of water and 0.009 parts of thickening water reducer and stir and mix for 3 minutes to obtain a mixture; then add the mixture to the premix for Stir for the second time for 2 minutes to obtain the final mixture. The slump of the final mixture is 30 mm, which is the required concrete material sample 2# for 3D printing. Among them, the cementitious material is a mixture of cement and fly ash, and the mass ratio of cement to fly ash is 1:1.2. The cement is selected from Portland cement or ordinary Portland cement, and the strength grade of the cement is 42.5. The classifi...

Embodiment 3

[0135] According to the formula ratio of concrete materials, measure and take 1.0 parts of cementitious material, 2.5 parts of natural fine aggregate, 0.01 part of nano-silica, 0.02 part of high elastic modulus polyethylene fiber, 0.012 part of redispersible latex powder, and 0.001 part of lignocellulose Parts, stirred for the first time for 1 minute to obtain a premix; at the same time, measure and take 0.60 parts of water and 0.005 parts of thickening water reducer and stir and mix for 1 minute to obtain a mixture; then add the mixture to the premix The second stirring was carried out for 3 minutes to obtain the final mixture. The slump of the final mixture was 20 mm, which was the required concrete material sample 3# for 3D printing. Among them, the cementitious material is a mixture of cement and fly ash, and the mass ratio of cement and fly ash is 1:0.8. The cement is selected from Portland cement or ordinary Portland cement, and the strength grade of the cement is 42.5. ...

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Abstract

The present invention provides a concrete material for 3D printing, and a preparation method thereof. The invention further provides the preparation method and an application of the concrete material.The invention further provides a concrete combination material for 3D printing, a concrete member, and a production method of the concrete member. A 3D printing concrete material system based on theconcept of material improvement, interface modification and overall reinforcement is formed, so the overall performances of the 3D printing concrete material and the produced member are improved, theconcrete material and the member have excellent mechanical properties and durability, the service life of the 3D printing material is prolonged, the concrete material is convenient to construct, the promotion of 3D printed concrete structures and buildings in practical engineering is promoted, and high engineering application values and high social benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of civil engineering materials, and relates to a concrete material for 3D printing and a preparation method thereof, in particular to a concrete material for 3D printing, a concrete composite material, a concrete component and a preparation method thereof. Background technique [0002] With the development of industrial technology, 3D printing technology has been more and more widely used in various industries of the national economy. In recent years, 3D printing technology has been used in the construction industry. Concrete is used as 3D printing "ink" to print building components with different shapes and structures. The whole process of computer programming and digital construction realizes the and reasonable unity of construction. In recent years, a large number of 3D printed concrete demonstration buildings have appeared in the Netherlands, the United Arab Emirates, Shanghai and Beijing in my country,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04B28B1/00B33Y10/00B33Y70/00C04B41/63
CPCB28B1/001B33Y10/00B33Y70/00C04B28/04C04B41/488C04B41/63C04B18/08C04B14/068C04B14/062C04B16/0625C04B24/2623C04B24/24C04B24/383C04B18/26C04B24/2682C04B24/2688C04B41/4543C04B41/4535C04B41/52
Inventor 肖建庄马志鸣段珍华于颖丁陶
Owner TONGJI UNIV
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