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Energy-saving and environment-friendly structural ultra-high performance fiber reinforced concrete

An ultra-high performance, energy-saving and environmentally friendly technology, applied in the field of building materials, can solve the problems of high internal stress, difficulty in ensuring dispersion and orientation, affecting structural durability, etc., achieve high tensile strength, reduce energy consumption and carbon dioxide Emissions, the effect of improving structural durability

Active Publication Date: 2021-07-23
HUNAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the dispersion and orientation of steel fibers in traditional UHPFRC are not only affected by the size of the structure, it is difficult to guarantee the dispersion and orientation, but also due to the restraint shrinkage, the UHPFRC material generates high internal stress and even produces more micro-cracks, which affects the durability of the structure.

Method used

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  • Energy-saving and environment-friendly structural ultra-high performance fiber reinforced concrete
  • Energy-saving and environment-friendly structural ultra-high performance fiber reinforced concrete
  • Energy-saving and environment-friendly structural ultra-high performance fiber reinforced concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0032]The UHPFRC material of the present embodiment is formed of cement, silica gray, two limestone blend, steel fibers, and PE fibers, water, quartz sand, and high efficiency water reduction. Among them, the cement uses CEMI type 52.5R stage common silicate cement with a dosage of 508.9 kg / m3; the average particle diameter of the silicone ash is 200 nm, the amount of two limestone powder used is an inert gelation material, wherein The limestone powder 1 has a average particle diameter of 10 μm, the amount of 1,70.2 kg / m3, the limestone powder 2 has average particle diameter of 2 μm, the amount of 379.1 kg / m3; the mixed fibers use a diameter of 0.2 mm, length 10 mm, length steel fiber and diameter It is 0.012mm, a PE fiber having a length of 6 mm, wherein the steel fiber volume is 3%, the amount of from 235.5 kg / m3, and the volume of PE fibers is 2%, the amount of water is from 19.6 kg / m3; the water used is 119.6 kg / M3; quartz sand has average particle size of 0.2 mm, ...

Embodiment 2

[0042] The novel UHPFRC material of this embodiment is formed of cement, silica gray, limestone powder, steel fiber, water, water, quartz sand, and high efficiency water reduction. Among them, the cement uses CEMI type 52.5R-stage ordinary silicate cement with a use of 508.9 kg / m3; the average particle diameter of the silicon ash is from 178.0 kg / m3; the amount of limestone is 344 kg / m3; hybrid fiber uses diameter A flat steel fiber and a diameter of 0.04 mm in length of 0.2 mm, a length of 4 mm, wherein the steel fiber volume is 3%, the amount of from 235.5 kg / m3, and the amount of PBO fiber is 2%. The amount of water used is 31.2 kg / m3; the amount of water used is 125.1 kg / m3; the average particle diameter of the quartz sand is 0.2mm, the amount of 525.1 kg / m3; the high-efficiency water reduction agent is highly efficient water reduction agent, 10.2 kg. / m3. The UHPC of the second embodiment employs an inert limestone substitution ratio of 40% cement dosage in rat...

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Abstract

The invention provides energy-saving and environment-friendly structural ultra-high performance fiber reinforced concrete, and belongs to the technical field of building materials. The concrete is prepared from cement, silica fume, a mineral admixture, quartz sand, hybrid fibers, water and a superplasticizer. The mass ratio of the components is as follows: 1 part of the cement, 0.2-0.4 part of the silica fume, 0.6-1.5 parts of the mineral admixture, 1-1.2 parts of the quartz sand and 0.17-0.25 part of the water; the mixing amount of the superplasticizer is 1.9-2.1%, the water-binder ratio is 0.14-0.20, and the total mixing amount of the volume of the hybrid fiber is 3-9%. According to the UHPFRC material, 40%-60% of cement in a traditional UHPFRC material is replaced with the mineral admixture, meanwhile, steel fibers are partially replaced with non-metal fibers, a multi-scale fiber hybrid system of the steel fibers and the non-metal fibers is formed, the bearing capacity of an engineering structure can be improved by effectively utilizing the characteristics of all the components, the use amount of the cement and the use amount of the steel fibers are reduced, the energy consumption and the emission of harmful gases in the environment are reduced, the purposes of energy conservation, emission reduction and environmental friendliness are achieved, and the application of the UHPFRC material in civil engineering structures is facilitated.

Description

Technical field [0001] The present invention belongs to the technical field of building materials, and more particularly to an ultra-high performance fiber reinforced concrete for energy saving and environmentally friendly structures. Background technique [0002] In the twentieth century, my country's architectural development is increasingly fierce, and the construction of infrastructure in all aspects is gradually improved, and it has a great impact on the natural environment while producing life. According to statistics, resources consumed by global infrastructure construction, operations and later maintenance account for 36% of the global energy consumption, while carbon dioxide emissions can reach 40%. The conventional concrete structure has a high amount of cement, which will not only consume natural resources, but also increase production costs, but also significantly increase the emissions of hydration heat and greenhouse gas generated during cement pouring, too much The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B2201/52C04B18/146C04B14/28C04B14/48C04B16/0625C04B14/06C04B2103/302C04B16/0616Y02W30/91
Inventor 张哲袁彬铖马永春李帅帅蒋高旭
Owner HUNAN UNIV OF TECH
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