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Strain-strengthened steel fiber and ultra-high strength toughness corrosion-resistant UHPC material

A strain-strengthened, ultra-high-strength and toughness technology, applied in the field of strain-strengthened steel fibers and ultra-high-strength, corrosion-resistant and anti-corrosion UHPC materials, can solve the problem of reducing the compressive strength and tensile strength of UHPC, affecting the toughness and durability of UHPC. It is difficult to mix the aggregates evenly, so as to improve the cracking resistance, protect the steel fiber body, and improve the construction quality.

Pending Publication Date: 2021-12-24
江苏东南结构防灾工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the applicant found in the production practice that the steel fibers of UHPC materials will form agglomerates near the shaft of the mixer during the stirring process, that is, the steel fibers will form agglomerations or clusters during the stirring process, which will make it difficult for the steel fibers to disperse or the steel fibers will be mixed with the bone. It is difficult to mix the material evenly, which affects the construction quality
The agglomeration of steel fibers will make it difficult to mix the steel fibers evenly in the cement-based composite material, thereby reducing the compressive strength and tensile strength of UHPC, and affecting the toughness and durability of UHPC

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] This embodiment relates to a strain-strengthened steel fiber, which includes a steel fiber body, the outer surface of which is coated with an insulating layer. Preferably, the insulating isolation layer is preferably a plastic layer or a resin layer. During implementation, the outer surface of the steel fiber body can be coated with an insulating and isolating layer by dipping or spraying, which is a prior art and will not be repeated here.

[0016] Preferably, the steel fiber body adopts copper-plated steel fiber or stainless steel fiber. Copper-plated steel fiber has the characteristics of strong compression, tensile and crack resistance, while stainless steel fiber has the characteristics of short process flow, low price, high strength and toughness.

[0017] In order to increase the interface bonding strength between steel fiber and the cementitious material in UHPC materials, various steel fiber bodies with special shapes are usually selected. For example, the cro...

Embodiment 2

[0019] UHPC material is an ultra-high-strength cement-based material with high strength, high toughness and low porosity. Its basic preparation principle is: by increasing the fineness and activity of the components, without using coarse aggregate, to minimize the internal defects (pores and micro-cracks) of the material, so as to obtain ultra-high strength and high durability. UHPC can be regarded as the most durable engineering material. The mechanical properties of UHPC with proper reinforcement are close to those of steel structures. At the same time, UHPC has excellent wear resistance and explosion resistance. Therefore, UHPC is especially suitable for long-span bridges, blast-resistant structures and thin-walled structures, as well as high abrasive and high corrosive environments.

[0020] This embodiment relates to an ultra-high-strength, corrosion-resistant and anti-corrosion UHPC material, including cementitious material, fine aggregate, ultra-high-efficiency water re...

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Abstract

The invention relates to a strain-strengthened steel fiber and an ultra-high strength and toughness corrosion-resistant UHPC material, the strain-strengthened steel fiber comprises a steel fiber body, the outer surface of the steel fiber body is coated with an insulation isolation layer, and the strain-strengthened steel fiber is adopted in the ultra-high strength and toughness corrosion-resistant UHPC material. According to the invention, steel fibers can be prevented from caking or piling during stirring, so that the compressive strength and tensile strength of the UHPC material are improved, and the toughness and durability of the UHPC material are further improved.

Description

technical field [0001] The invention relates to a strain-strengthened steel fiber and an ultra-high-strength, corrosion-resistant, and anti-corrosion UHPC material, which belongs to the technical field of ultra-high performance concrete materials. Background technique [0002] Ultra-high performance concrete, referred to as UHPC (Ultra-High Performance Concrete), also known as reactive powder concrete (RPC, Reactive Powder Concrete), is the most innovative cement-based engineering material in the past 30 years. Big leap. Ultra-high performance concrete (UHPC) refers to a cement-based composite material with a compressive strength above 150MPa, ultra-high toughness, and ultra-long durability. It has broad application prospects in bridge engineering, construction engineering, and protective engineering. [0003] The main components of UHPC are cementitious materials such as silica fume and cement, fine aggregate (generally less than 0.5mm in particle size), high-efficiency wa...

Claims

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Application Information

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IPC IPC(8): C04B14/48C04B20/10C04B28/00C04B111/26
CPCC04B14/48C04B20/1029C04B28/00C04B2111/26C04B2103/302
Inventor 夏瑾
Owner 江苏东南结构防灾工程有限公司
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