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Fiber-reinforced cement-based materials for 3D printing and its preparation, performance evaluation and application

A fiber-reinforced cement and 3D printing technology, which is applied in the analysis of materials, additive processing, and flow characteristics, can solve the problems of concrete tensile and shear strength not being improved, increasing construction complexity, and reducing the degree of mechanical automation. Achieve the effect of maintaining early mechanical properties, accelerating setting time, and maintaining buildability

Active Publication Date: 2021-06-22
SOUTHEAST UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some application examples, the method of printing the external formwork and filling the steel bars for concrete to meet the mechanical properties, however, runs counter to the original technical advantages of 3D printing technology, and instead increases the complexity of construction and reduces the degree of mechanical automation.
At the same time, most of the concrete materials designed for 3D printing are modified concrete with only adjusted rheological properties, which do not improve the tensile and shear strength of the concrete itself, and still need reinforcement to support the force.

Method used

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  • Fiber-reinforced cement-based materials for 3D printing and its preparation, performance evaluation and application
  • Fiber-reinforced cement-based materials for 3D printing and its preparation, performance evaluation and application
  • Fiber-reinforced cement-based materials for 3D printing and its preparation, performance evaluation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A fiber-reinforced cement-based material for 3D printing, which has ultra-high toughness, and includes the following components in parts by weight: 2.44 parts of ordinary Portland cement, 0.50 part of sulphoaluminate cement, 0.40 part of silica fume, and powdered coal 1.88 parts of ash, 1.70 parts of quartz sand, 0.09 parts of polyethylene fiber, 0.003 parts of rheological agent, and 0.072 parts of water reducing agent.

[0042] in:

[0043] The 28-day flexural strength of the ordinary Portland cement is 10.6MPa, the 28-day compressive strength is 52.8MPa, and the specific surface area is 362m 2 / kg, the density is 3.17g / cm 3 , the water consumption of the standard consistency is 24.8%, the initial setting time is 140min, the final setting time is 245min, the loss on ignition is 3.24%, and the magnesium oxide content is 0.87%.

[0044] The loss on ignition of the sulphoaluminate cement is 11.76%, and the 1-day compressive strength is 81.8MPa. It contains red mud, alum...

Embodiment 2

[0064] A fiber-reinforced cement-based material for 3D printing, which has ultra-high toughness, and includes the following components in parts by weight: 2.36 parts of ordinary Portland cement, 0.40 parts of sulphoaluminate cement, 0.75 parts of silica fume, and powdered coal Ash 1.90 parts, quartz sand 1.60 parts, polyethylene fiber 0.08 parts, rheological agent 0.002 parts, water reducer 0.070 parts.

[0065] The 28-day flexural strength of the ordinary Portland cement is 10.6MPa, the 28-day compressive strength is 52.8MPa, and the specific surface area is 362m 2 / kg, the density is 3.17g / cm 3 , the water consumption of the standard consistency is 24.8%, the initial setting time is 140min, the final setting time is 245min, the loss on ignition is 3.24%, and the magnesium oxide content is 0.87%.

[0066] The loss on ignition of the sulphoaluminate cement is 11.76%, and the 1-day compressive strength is 81.8MPa. It contains red mud, aluminum ash, carbide slag and desulfurize...

Embodiment 3

[0086] A fiber-reinforced cement-based material for 3D printing, which has ultra-high toughness, and includes the following components in parts by weight: 2.28 parts of ordinary Portland cement, 0.30 parts of sulphoaluminate cement, 0.20 parts of silica fume, and powdered coal Ash 1.96 parts, quartz sand 1.66 parts, polyethylene fiber 0.07 parts, rheological agent 0.002 parts, water reducer 0.066 parts.

[0087] The 28-day flexural strength of the ordinary Portland cement is 10.6MPa, the 28-day compressive strength is 52.8MPa, and the specific surface area is 362m 2 / kg, the density is 3.17g / cm 3 , the water consumption of the standard consistency is 24.8%, the initial setting time is 140min, the final setting time is 245min, the loss on ignition is 3.24%, and the magnesium oxide content is 0.87%.

[0088] The loss on ignition of the sulphoaluminate cement is 11.76%, and the 1-day compressive strength is 81.8MPa. It contains red mud, aluminum ash, carbide slag and desulfurize...

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Abstract

The invention discloses a fiber-reinforced cement-based material (ECC) for 3D printing and its preparation, performance evaluation and application. The cement-based material uses sulphoaluminate cement produced from industrial solid waste as an early strength agent, and is added with polyethylene fibers with high tensile strength and modulus. It is introduced into 3D printed concrete for construction 3D printing, unreinforced construction of concrete structures or components or cast-in-place concrete structures, has the characteristics of strain strengthening and multi-slit cracking under the action of tension and bending, and has high ductility and high energy consumption capacity, which solves the problem of 3D printing plain concrete components The problem of low mechanical properties; the preparation method of the fiber-reinforced cement-based composite material is simple, low in cost, low-carbon and environmentally friendly, and has certain engineering demonstration significance and social benefits. The invention also provides a method for evaluating the 3D printing performance of the material, including a micro-slump test, a fluidity test and a rheological property test.

Description

Technical field: [0001] The invention relates to a fiber-reinforced cement-based material for 3D printing and its preparation, performance evaluation and application, and belongs to the technical field of civil engineering materials. Background technique: [0002] In recent years, as the country vigorously advocates the transformation and upgrading of construction industrialization, prefabricated buildings have flourished, which has greatly improved the productivity of the construction industry. However, whether it is a cast-in-place structural system or a prefabricated structural system, it requires a lot of manpower, energy, and materials, and brings a lot of environmental pollution. Higher-performance, more digital, more intensive, and more flexible construction methods have become hotspots and difficulties in international research in the field of structures. The 3D printing technology, which emerged at the end of the 20th century, can use computer automatic control tec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/06G01N11/14B33Y70/10
Inventor 潘金龙周震鑫朱彬荣张洋
Owner SOUTHEAST UNIV
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