Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Sprayed concrete for roadway

A sprayed concrete and roadway technology, applied in the field of building materials, can solve the problems of material brittleness, poor quality control of shotcrete, inability to have high adhesion, cracking prevention and waterproofing at the same time, and achieve the effect of strength and toughness

Pending Publication Date: 2021-07-23
河南省宜居建材科技有限公司
View PDF6 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the process technology of mixing cement spraying materials on site is adopted for mining roadways. This process is to transport cement, sand, stones, etc. into the mine, and dry mix cement spraying materials on site. This method has the following three obvious disadvantages: 1. .On-site mixing, it is difficult for the operator to control the ratio, and the strictness of the quality control of the spraying grout is poor
2. On-site mixing needs to occupy valuable tunnel space in the mine, pile up cement and sand and gravel, affect the tunnel section and transportation space, and easily block the tunnel and cause accident hazards
3. Dust from cement unloading, sand and gravel unloading, and mixing and loading dust in underground roadways will aggravate the pollution of mine roadway environment and seriously affect the health of workers
[0003] The currently used support mortar and concrete formulations for underground mine roadways lead to unstable quality, resulting in mine roadway rocks falling, local landslides, roadway water seepage and other accidents. The details are as follows: 1. The shotcrete materials have poor instantaneous adhesion and Because of the rigid nature of the sprayed material, it is easy to rebound after sprayed on the rock surface, resulting in more than 30 ground materials, resulting in a serious waste of sprayed material
2. The combination of shotcrete materials cannot achieve toughness and rigidity, and cannot have high adhesion, anti-cracking, waterproof and other characteristics at the same time
The thickness of the reinforced support is required to be large, and the time for the support to play its role will be slowed down, resulting in a serious waste of shotcrete materials
3. The combination of shotcrete material has high rigid components, and the material is brittle. After the shotcrete material is solidified, it will easily cause hidden dangers such as collapse of the support mortar with the geological movement of the underground roadway or the vibration of blasting during mining.

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
  • Sprayed concrete for roadway

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] This embodiment provides a shotcrete for roadway, including the following raw materials in parts by weight: 80 parts of cement, 40 parts of superfine aggregate, 80 parts of fine sand, 10 parts of fiber, 6 parts of rubber powder, and nano-alumina 7 parts, 3 parts of polyacrylamide, 8 parts of MK-1 reinforcing agent, 1.5 parts of water reducing agent, 0.5 parts of flame retardant, 10 parts of accelerator.

[0019] The particle size of the rubber powder is 40 mesh. The cement is Portland cement. The superfine aggregate is quartz powder. The superfine aggregate is slag fine powder. The quick-setting agent is 782 type quick-setting agent.

Embodiment 2

[0021] This embodiment provides a shotcrete for roadway, including the following raw materials in parts by weight: 100 parts of cement, 60 parts of superfine aggregate, 100 parts of fine sand, 15 parts of fiber, 10 parts of rubber powder, and nano-alumina 8 parts, polyacrylamide 6 parts, MK-1 reinforcing agent 10 parts, water reducer 3 parts, flame retardant 0.5 parts, accelerator 12 parts.

[0022] The particle size of the rubber powder is 60 mesh. The cement is Portland cement. The superfine aggregate is quartz powder. The superfine aggregate is slag fine powder. The quick-setting agent is 782 type quick-setting agent.

[0023] According to "GB-T50081-2002 Standard for Test Methods of Mechanical Properties of Ordinary Concrete", the various technical indicators of the shotcrete made in Test Example 1 and Example 2 are shown in Table 1:

[0024] Table 1

[0025]

[0026] Polyacrylamide can significantly improve the flexural strength, bond strength, flexural toughness ...

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
particle size (mesh)aaaaaaaaaa
particle size (mesh)aaaaaaaaaa
Login to View More

Abstract

The invention provides sprayed concrete for a roadway. The sprayed concrete is prepared from the following raw materials in parts by weight: 80-120 parts of cement, 40-60 parts of superfine aggregate, 80-100 parts of fine sand, 10-20 parts of fibers, 6-12 parts of rubber powder, 7-10 parts of nano aluminum oxide, 3-8 parts of polyacrylamide, 8-14 parts of an MK-1 reinforcing agent, 1.5-5 parts of a water reducing agent, 6-10 parts of a flame retardant and 10-18 parts of an accelerator. According to the invention, an inorganic-organic co-hybrid polymer dispersion group system is formed on the basis of the principle of an inorganic-organic ultrafine powder assembly, coating and dispersion system, so that moderate toughness and rigidity can be achieved, excellent guniting material indexes such as high adhesion, cracking resistance, impermeability, reinforcement and support and the like are achieved, and the concrete also has relatively strong toughness, ductility, heat insulation and shock absorption performance.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to shotcrete used for roadways. Background technique [0002] In order to ensure the unobstructed passage and safe production of the underground roadway, it is necessary to carry out mining follow-up support for the underground roadway. Generally, cement mortar and concrete are used to spray grout on the rock surface of the underground roadway. After the cement mortar is solidified, it can prevent rocks from collapsing and groundwater Infiltrate the alleyway. At present, the process technology of mixing cement spraying materials on site is adopted for mining roadways. This process is to transport cement, sand, stones, etc. into the mine, and dry mix cement spraying materials on site. This method has the following three obvious disadvantages: 1. . On-site mixing, the operator is not easy to control the ratio, and the strictness of the quality control of the spraying grout...

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 Applications(China)
IPC IPC(8): C04B28/04C04B14/30
CPCC04B28/04C04B14/303C04B2201/50C04B2111/00155C04B2111/00008C04B2111/00724C04B18/141C04B14/06C04B20/0048C04B16/04C04B24/2652C04B2103/0068C04B2103/302C04B2103/63C04B2103/12
Inventor 孙朝惜杨伟杰
Owner 河南省宜居建材科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Eureka Blog
Learn More
PatSnap group products