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

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

Active Publication Date: 2019-06-28
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 material for 3D printing, preparation, performance evaluation and application
  • Fiber reinforced cement-based material for 3D printing, preparation, performance evaluation and application
  • Fiber reinforced cement-based material for 3D printing, 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, preparation, performance evaluation and an application. The cement-based material is prepared by taking sulfatealuminum cement produced by industrial solid wastes fully as an early strength agent and doping polyethylene fiber relatively high in tensile strength and modulus. The cement-based material is introduced to 3D printing concrete and is applied to building 3D printing and a concrete structure or ribless construction of a member or pouring of the concrete structure, has the characteristics of strainstrengthening and multi-crack cracking under action of stretching and bending, has high ductility and high energy consumption, and solves the problem that a 3D printing concrete member is low in mechanical property. The fiber reinforced cement-based composite material is simple in preparation method, low in cost and low-carbon and environment-friendly, and has certain engineering demonstration meaning and social benefits. The invention also provides a 3D printing performance evaluation method of the material, including micro slump test, flowability test and 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 Applications(China)
IPC IPC(8): C04B28/06G01N11/14B33Y70/00
Inventor 潘金龙周震鑫朱彬荣张洋
Owner SOUTHEAST UNIV
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