Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A kind of ultra-high strength and high bonding performance fiber reinforced concrete and its preparation method

An ultra-high-strength, fiber-reinforced technology, applied in the field of building materials, can solve harsh environments such as exposure to seashores, freeze-thaw areas, and aggressive atmospheres, restricting the development and application of high-performance fiber-reinforced concrete, and the preparation technology is difficult to large-scale Promotion and other issues, to achieve high volume stability and economy, easy to promote, and improve durability

Active Publication Date: 2020-02-11
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In recent years, building structures have developed towards high-rise, super-high-rise, long-span and heavy-duty, and many structures are exposed to harsh environments such as seaside, freeze-thaw areas, and corrosive atmospheres. This has a great impact on the mechanical properties and durability of concrete materials and components Higher requirements have been put forward. Traditional concrete materials have low strength, poor ductility and durability, which obviously cannot meet the requirements. Therefore, more and more domestic and foreign scholars have started to study high-performance concrete.
High-performance concrete includes high-strength high-performance concrete and high-performance fiber-reinforced concrete. High-strength high-performance concrete has excellent properties such as high compressive strength, high impermeability, good durability and workability, but the defect of high-strength high-performance concrete is brittleness Large and low tensile strength, in order to improve its tensile ductility, researchers added fibers (synthetic fibers or steel fibers) to the matrix to develop high-performance fiber-reinforced concrete, high-performance fiber-reinforced concrete not only compressive, The tensile strength is high, the bonding strength, toughness and durability have been greatly improved, and the preparation of high-performance concrete uses industrial waste such as fly ash and silica fume, which is sustainable, so high-performance fiber-reinforced concrete has broad applications. Application prospects
[0005] In the domestic existing technology to produce high-performance fiber-reinforced concrete under outdoor maintenance conditions, P·O 52.5 or P·O 62.5 cement is generally used to prepare ultra-high-strength (compressive strength exceeding 120MPa) high-performance fiber-reinforced concrete. As an aggregate, the active powder concrete produced with a steel fiber content of 3% has a compressive strength of 178.8MPa, but this preparation technology has high requirements for raw materials. For example, the cement currently available on the market is P·O42.5 Mainly cement, P·O 52.5 or P·O 62.5 cement is difficult to buy in the market due to the small demand; standard sand is a strategic material exclusively controlled by the state, and any unit or individual is not allowed to operate it without permission. Standard sand has strict requirements on the selection of raw materials and processing technology, and is expensive, so this preparation technology is difficult to promote on a large scale
The compressive strength of concrete prepared by other researchers does not exceed 140MPa, which is enough to show that the preparation technology of concrete with a compressive strength exceeding 140MPa under outdoor curing conditions is still a difficult point, which also limits my country's high-performance fiber-reinforced concrete to a certain extent. Development and Application of Concrete

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of ultra-high strength and high bonding performance fiber reinforced concrete and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Raw materials

[0039] 1. Cement

[0040] Select P·O 42.5 cement with stable quality and good performance, and conduct an adaptability test with polycarboxylate concrete superplasticizer before use. The test method adopts the current building materials industry standard "Cement and Water Reducer Capacitance test method "JC / T 1083-2008 method, good compatibility with polycarboxylate concrete superplasticizer. The performance indicators of the selected cement meet the requirements of the relevant current national standards, and its alkali content is low, its heat of hydration is low, and its water demand is also low.

[0041] 2. Fine aggregate

[0042] Quartz powder and quartz sand 1: Quartz sand 2: Quartz sand 3: Quartz sand 4 Choose by mass ratio, SiO 2 The content is 99.72%, TFe 2 o 3 The content is 0.024%. The raw material quartz ore used in the production of quartz sand is a pure natural silicate mineral with hard texture, wear resistance and stable chemical...

Embodiment 2

[0066] Example 2: The mix ratio of the ultra-high strength and high bonding performance fiber reinforced concrete of this example is shown in the following table, and its raw material selection and preparation method are the same as in Example 1

[0067] Material cement water Silica fume Quartz powder Quartz sand 1 Quartz sand 2 Quartz sand 3 Quartz sand 4 Superplasticizer steel fiber Mass / kg 850 180 190 200 127 190 222 317 30 150

Embodiment 3

[0068] Example 3: The ratio of the ultra-high strength and high bonding performance fiber-reinforced concrete in this example is shown in the following table, and its raw material selection and preparation method are the same as in Example 1

[0069] Material cement water Silica fume Quartz powder Quartz sand 1 Quartz sand 2 Quartz sand 3 Quartz sand 4 Superplasticizer steel fiber Mass / kg 850 200 180 200 127 190 222 317 20 250

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
lengthaaaaaaaaaa
diameteraaaaaaaaaa
compressive strengthaaaaaaaaaa
Login to View More

Abstract

A fiber-reinforced concrete with ultra-high strength and high bonding performance and a preparation method thereof. The fiber-reinforced concrete is prepared according to the following weight ratio: cement: water: silica fume: quartz powder: quartz sand 1: quartz sand 2: quartz sand 3: quartz Sand 4: Water reducer: steel fiber = 850: 180-200:180-210:200:127:190:222:317:20-30:150-250. The preparation method is as follows: first pour all the quartz sand, cement and silica fume into the mixer in sequence, and stir; add water and water reducing agent, stir; add steel fiber, stir, and discharge. Under the condition of outdoor curing for 28 days, the compressive strength of the concrete is ≥140MPa, and the bonding strength with the deformed steel bar is ≥60MPa, which greatly improves the compressive strength of the concrete, and the bonding strength between the steel bar and the concrete can greatly improve the reinforced concrete components. Reinforcement ratio, reducing the thickness of the protective layer, improving the bearing capacity and durability of structural components, has good economic benefits.

Description

technical field [0001] The invention belongs to the technical field of building materials, and relates to a fiber-reinforced concrete with ultra-high strength and high bonding performance under outdoor curing conditions and a preparation method thereof. Background technique [0002] Since the invention of Portland cement in 1824, concrete has been rapidly applied because of its easy molding and low price. Although concrete is a traditional man-made building material, because of its irreplaceable advantages (abundant raw materials, simple production process, high cost performance, etc.) and the continuous progress of concrete material science and technology, concrete has become the main body of civil engineering materials. , It will also be one of the indispensable main materials in future civil engineering and national construction. However, with the continuous expansion of the city, the continuous increase of the population, the continuous increase of the land price, the h...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/02
CPCC04B28/02C04B2201/50C04B18/146C04B14/06C04B2103/302C04B14/48
Inventor 梁兴文胡翱翔李东阳邢朋涛戚桢婷王照耀
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products