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Multi-scale fiber-reinforced high-performance cement-based composite material and preparation method thereof

A fiber-reinforced, composite material technology, applied in the field of fiber-reinforced cement-based composite material preparation, can solve the problem of not seeking multi-scale fiber material systems, lack of understanding and method theoretical support for optimal design of fiber-reinforced cement-based composite materials, and lack of design methods. and analysis methods, etc., to achieve the effect of improving the safety of use, improving the strength and toughness, and having a wide range of material sources.

Inactive Publication Date: 2013-10-30
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0013] Obviously, this is due to the lack of understanding of the multi-scale structural characteristics and multi-scale failure process of cement-based materials, the lack of corresponding design methods and analysis methods, the lack of an economical and applicable multi-scale fiber material system, and the lack of understanding of fiber-reinforced cement. Understanding and methodological theoretical support for optimal design of matrix composites

Method used

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  • Multi-scale fiber-reinforced high-performance cement-based composite material and preparation method thereof
  • Multi-scale fiber-reinforced high-performance cement-based composite material and preparation method thereof
  • Multi-scale fiber-reinforced high-performance cement-based composite material and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0041]In this embodiment, the water-cement ratio is 0.3, and the sand-cement ratio is 0.5. The total amount of multi-scale fiber system is 2.45 Vol.%, which is composed of steel fiber: PVA fiber: calcium carbonate whisker = 1: 0.11: 0.30.

[0042] Steel fiber without end hook, length 13mm, diameter 0.2mm, aspect ratio 65, tensile strength 2400MPa; polyvinyl alcohol fiber (PVA fiber) length 6mm, diameter 31μm, tensile strength 1100MPa, elastic modulus 41GPa; Calcium carbonate whiskers have a length of 20-30μm, a diameter of 0.5-2μm, an aspect ratio of 15-60, a tensile strength of 3-6GPa, and an elastic modulus of 410-710GPa.

[0043] Prepare as follows:

[0044] (1) Mix cement, sand and calcium carbonate whiskers evenly (30s);

[0045] (2) Add water into the blender and stir the mixture of (1) evenly (60s);

[0046] (3) Add the polyvinyl alcohol fiber into the mixer and stir evenly (90s);

[0047] (4) Add the steel fiber into the mixer and stir evenly (90s);

[0048] (5)...

Embodiment 2

[0054] In this embodiment, the water-cement ratio is 0.3, and the sand-cement ratio is 0.5. The total amount of multi-scale fiber system is 2.9Vol.%, which is composed of steel fiber: PVA fiber: calcium carbonate whisker = 1: 0.27: 0.67. The dosage of high-efficiency water reducer is 0.25%

[0055] Steel fiber without end hook, length 13mm, diameter 0.2mm, aspect ratio 65, tensile strength 2400MPa; polyvinyl alcohol fiber (PVA fiber) length 6mm, diameter 31μm, tensile strength 1100MPa, elastic modulus 41GPa; Calcium carbonate whiskers have a length of 20-30μm, a diameter of 0.5-2μm, an aspect ratio of 15-60, a tensile strength of 3-6GPa, and an elastic modulus of 410-710GPa.

[0056] Prepare as follows:

[0057] (1) Mix cement, sand and calcium carbonate whiskers evenly (30s);

[0058] (2) Add water and high-efficiency superplasticizer to the mixer and stir the mixture of (1) evenly (60s);

[0059] (3) Add the polyvinyl alcohol fiber into the mixer and stir evenly (90s);...

Embodiment 3

[0065] In this embodiment, the water-cement ratio is 0.3, and the sand-cement ratio is 0.5. The total amount of multi-scale fiber system is 3.8Vol.%, which is composed of steel fiber: PVA fiber: calcium carbonate whisker = 1: 0.44: 1.6. The dosage of high-efficiency superplasticizer for powder is 0.35%.

[0066] Steel fiber without end hook, length 13mm, diameter 0.2mm, aspect ratio 65, tensile strength 2400MPa; polyvinyl alcohol fiber (PVA fiber) length 6mm, diameter 31μm, tensile strength 1100MPa, elastic modulus 41GPa; Calcium carbonate whiskers have a length of 20-30μm, a diameter of 0.5-2μm, an aspect ratio of 15-60, a tensile strength of 3-6GPa, and an elastic modulus of 410-710GPa.

[0067] Prepare as follows:

[0068] (1) Mix cement, sand, powder superplasticizer and calcium carbonate whisker evenly (30s);

[0069] (2) Add water into the blender and stir the mixture of (1) evenly (60s);

[0070] (3) Add the polyvinyl alcohol fiber into the mixer and stir evenly (...

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Abstract

The invention relates to a multi-scale fiber-reinforced high-performance cement-based composite material and a preparation method of the multi-scale fiber-reinforced high-performance cement-based composite material, and belongs to the technical field of fiber-reinforced cement-based composite materials. The multi-scale fiber-reinforced high-performance cement-based composite material comprises a base body and a multi-scale fiber system, wherein the base body comprises cement and sand, the multi-scale fiber system comprises steel fibres, polyvinyl alcohol fibers (PVA fibres) and calcium carbonate whiskers, the dosage of the multi-scale fiber system accounts for 2.4-5.6 vol.% of the volume of the fibre-reinforced cement-based material, and the volume ratio of the steel fibres to the PVA fibres to the calcium carbonate whiskers is 1 to (0.1-1.2) to (0.3-5.3). The multi-scale fiber-reinforced high-performance cement-based composite material and the preparation method provided by the invention have the advantages that the manufacturing technique is simple, special equipment is not needed, the multi-scale fiber-reinforced high-performance cement-based composite material is as the same as the common cement-based material, the source of materials is wide, the finished product price is low, the industrialized production is realized, the multi-scale fiber-reinforced high-performance cement-based composite material with different properties is obtained by adjusting the ratio, and the product can be used for manufacturing a cast-in-place structure and a cladding material and also can be prefabricated into a product.

Description

technical field [0001] The invention belongs to the technical field of preparation of fiber-reinforced cement-based composite materials, and relates to a multi-scale fiber-reinforced high-performance cement-based composite material and a preparation method thereof. Background technique [0002] Cement-based materials have obvious brittleness. Although traditional fiber reinforced cement-based composites (FRCC) have effectively improved the inherent high brittleness of cement-based materials and improved their overall toughness, they have obvious strain softening behavior and single-slit or Cracking mode with few cracks, while strain hardening and cracking with multiple cracks is the goal pursued by high-performance fiber reinforced cementitious composites. [0003] The multi-scale characteristics of cement-based materials determine its microscopic, mesoscopic and macroscopic properties, and are reflected in its multi-scale failure process. A single variety and type of macro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B16/06
Inventor 曹明莉张聪李勇
Owner DALIAN UNIV OF TECH
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