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Three-dimensional orientation fibre-reinforced cement base composite material

A fiber-reinforced cement and composite material technology, which is applied in the field of building materials, can solve the problems of uneven stress and easy lamination of materials, and achieve increased reinforcement and toughening effects, excellent tensile strength, and reduced average fiber spacing. Effect

Inactive Publication Date: 2008-05-07
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Aiming at the defects of uneven stress and easy lamination in the prior art, the present invention proposes a three-dimensional directional fiber reinforced cement-based composite material with fibers distributed in three-dimensional space and higher strength

Method used

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  • Three-dimensional orientation fibre-reinforced cement base composite material
  • Three-dimensional orientation fibre-reinforced cement base composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Use P.II 52.5R Portland cement, I-class fly ash, S95-class slag, silica fume (SiO2 content above 92%), low-alkali U-shaped concrete expansion agent (UEA-N), shield bell-shaped steel fiber ( The fiber equivalent diameter is 0.73mm, the fiber length is 25mm, the aspect ratio is 34.2, and the fiber tensile strength is above 900MPa), HP400R retarding superplasticizer (polycarboxylate superplasticizer) and ordinary yellow sand ( Fineness modulus 2.28) as raw material, the weight ratio of cementitious material components is: cement: fly ash: slag: silica fume: expansion agent = 0.6: 0.1: 0.1: 0.1: 0.1, cementitious material components and fine The weight ratio of aggregate, water and superplasticizer is: cementitious material component: fine aggregate: water: superplasticizer=1: 1: 0.24: 0.0195, and the volume of steel fiber is the total after all components are mixed. 5% of the volume. The 40mm×40mm×160mm specimen was molded with fiber-soaked slurry, and the steel fibers sh...

Embodiment 2

[0015] Using the same raw materials, mixing ratio, molding process and curing method as in Example 1, a 40mm×40mm×160mm high-performance directional fiber reinforced cement-based composite material specimen was made, and only the volume content of the steel fiber was increased to the entire composition 10% of the total volume after mixing. The physical and mechanical properties and frost resistance of the specimen were measured when the standard curing age reached 50 days. The results are as follows: the compressive strength of the three-dimensional oriented fiber reinforced cement-based composite material is 206.8 MPa, and the characteristic point compressive toughness index of 15.5 times the initial cracking strain The flexural strength is 15.43, the flexural strength is 52.0MPa, the flexural toughness is 26.91N m, the flexural toughness index of the characteristic point of 15.5 times the first crack deflection is 28.33, the splitting tensile strength is 23.29MPa, at -(17±2)℃...

Embodiment 3

[0017] Using the same raw materials, mixing ratio, molding process and curing method as in Example 1, a 40mm×40mm×160mm high-performance directional fiber reinforced cement-based composite material specimen was made, and only the volume content of the steel fiber was increased to the entire composition 15% of the total volume after mixing. The physical and mechanical properties and frost resistance of the specimen were measured when the standard curing age reached 50 days. The results are as follows: the compressive strength of the three-dimensional oriented fiber reinforced cement-based composite material is 222.8MPa, and the characteristic point compressive toughness index of 15.5 times the initial cracking strain The flexural strength is 31.52, the flexural strength is 69.1MPa, the flexural toughness is 42.73N m, the flexural toughness index of the characteristic point of 15.5 times the first crack deflection is 20.45, and the splitting tensile strength is 31.27MPa. After 8...

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Abstract

The invention relates to three-dimensional oriented fibre reinforced cement base composite material which belongs to the field of concrete of building material. The composite material comprises gelled material, fine aggregate, water, three-dimensional oriented fibre and superplasticizer, wherein, the proportion by weight of the gelled material, the fine aggregate, the water and the superplasticizer is 1:(1 to 2.5):(0.13 to 0.35):(0.01 to 0.03). The gelled material component comprises cement and mineral additive, and the proportion by weight of the cement and the mineral additive is (0.4 to 0.9):(0.1 to 0.6), or the gelled material component comprises the cement , the mineral addition and expansion agent, the proportion by weight of the three is (0.35 to 0.85):(0.1 to 0.5):(0.05 to 0.15), the mineral additive is one of fly ash, slag, siliceous dust and metakaolin, the volume of the three-dimensional oriented fibre is 5 percent to 35 percent of the whole volume after all components are mixed, and the three-dimensional oriented fibre can choose a three-dimensional steel fibre net rack which is made of shortly-cut steel fibre and steel wires and a three-dimensional assorted fibre net rack which is made of steel wires and high performance organic base fibre. The invention ensures that the fibre is directionally arrayed at the high performance oriented fibre reinforced cement base composite material. Through utilizing the fly ash, the slag, the siliceous dust and the metakaolin as raw materials, the invention which can protect the environment and reduce the cost has the advantages of high strength, good toughness and high durability.

Description

technical field [0001] The invention belongs to a building material, in particular to a three-dimensional directional fiber-reinforced concrete with ultra-high strength and high performance. Background technique [0002] For cement-based composite materials reinforced with high-volume steel fibers, the pulp-staining process is adopted internationally, that is, fluid mortar is injected into the fiber skeleton placed in the formwork in advance, and a steel fiber volume ratio of 5% to 20% has been developed. Stained fiber reinforced concrete, the obtained flexural strength is 27-69MPa, and the compressive strength is 63-190MPa. However, the steel fibers in the slurry fiber reinforced concrete belong to three-dimensional random distribution, and its strengthening and toughening effects have not exerted the best effect. In order to overcome this shortcoming, there has been a slurry-stained fiber mesh-reinforced concrete in the world. Its base material and construction method are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B14/48
CPCC04B28/02C04B40/0039Y02W30/91C04B14/04C04B14/06C04B14/106C04B14/34C04B14/48C04B18/08C04B18/141C04B2103/32C04B2103/0045
Inventor 余红发麻海燕季斌
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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