Unlock instant, AI-driven research and patent intelligence for your innovation.

A Modified Fly Ash and Its Application in Concrete

A fly ash and modification technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of excessive heavy metals, limit the use of fly ash in power plants, leaching, etc.

Inactive Publication Date: 2022-02-25
北京新奥混凝土集团有限公司
View PDF14 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, in the prior art, a lot of fly ash comes from power plants, and such fly ash often contains excessive heavy metals
When such fly ash is used, the heavy metals in the fly ash will be leached, causing environmental pollution, which severely limits the utilization of fly ash in power plants

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 Modified Fly Ash and Its Application in Concrete
  • A Modified Fly Ash and Its Application in Concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Formula (1) complexing agent is obtained by the method comprising the following steps: 2g polypropylene fiber is dispersed in 150mL distilled water in Erlenmeyer flask, then adds redox initiator system (benzoyl peroxide, Tween 80 and pyridine), and the mixture was shaken vigorously for 8 minutes, then acrylic acid monomer was added, and the reaction was carried out with stirring at 85°C for 3 hours, after which the product was filtered and washed with distilled water, and dried at 50°C to constant weight, the prepared The resulting polypropylene-polyacrylic acid grafted fiber was reacted with dimethylamine to prepare the final modified complexing agent, wherein the polypropylene-polyacrylic acid grafted fiber and a toluene solution of dimethylamine (100mL 5% (v / v) ) was slowly stirred at 60°C for 3 hours, then the modified complexing agent was filtered and washed with absolute ethanol, and then dried at 50°C to obtain the complexing agent shown in formula (1). This comp...

Embodiment 2

[0058] Take the abandoned ordinary house building bricks, crush the building waste bricks with a jaw crusher, and then sieve out waste brick particles with a particle size of 5-10mm, dry the particles at a temperature of 110°C for 1.2 hours, and then The dried waste brick particles are immersed in the ethanol solution of polyvinylpyrrolidone (the concentration of polyvinylpyrrolidone is 1.5wt%), stirred at a speed of 20rpm, and the stirring time is 1.5h, then the soaked waste brick particles are taken out, Dry in the air, place the impregnated waste brick aggregate in a wire mesh hanging basket, place it in the prepared cement slurry (the water-to-binder ratio of the cement slurry is 1.3), take it out after shaking and shaking for 3 minutes, and cure it at room temperature for 1 day ,spare. According to the modified fly ash that cement, natural coarse aggregate, embodiment 1 make, FJ1 activator and water carry out material preparation in the weight ratio of 1:1.24:0.53:0.22:0....

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 diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention provides a modified fly ash and its application in concrete. The modified fly ash is doped with fibrous material. When the modified fly ash is applied to concrete, part of the cement can be replaced, and the modified fly ash has high flexural strength and environmental performance while making full use of the fly ash.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemistry, and in particular relates to a modified fly ash and its application in concrete. Background technique [0002] For a long time, a certain amount of fly ash has been mixed in concrete at home and abroad, but as a substitute for cement, it is used in the following three ways in most cases: the early strength requirement is very low, and the long-term strength is about 25-35MPa In large-volume hydraulic concrete, it can be used instead of cement in a large amount; in structural concrete, it can be replaced in a small amount (10-25%); in backfill or road base with low strength requirements, it can be used in large quantities. Fly ash can fill the gaps of aggregate particles and wrap them to form a lubricating layer. Because the bulk density (apparent density) of fly ash is only about 2 / 3 of that of cement, and the particle shape is good (good quality fly ash contains a lot of glass Micro...

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): C04B20/02C04B28/22C04B18/08D06M14/10D06M15/263D06M13/328D06M101/20
CPCC04B20/023C04B28/186C04B18/08D06M14/10D06M15/263D06M13/328D06M2101/20C04B7/02C04B14/068C04B22/002C04B18/16Y02W30/91
Inventor 汪恭胜
Owner 北京新奥混凝土集团有限公司