Modified ardealite stabilized macadam as well as preparation method and application thereof

A technology for stabilizing crushed stone and phosphogypsum, used in climate sustainability, sustainable waste treatment, solid waste management, etc., to solve problems such as poor shrinkage, load cracks, and reduced service life

Active Publication Date: 2021-12-07
湖北昌耀新材料工程技术研究有限责任公司
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fact that the materials that make up the water-stabilized layer are prone to dry shrinkage cracks and temperature shrinkage cracks when the humidity and temperature change, and as the traffic load increases, it is easy to produce load cracks, resulting in the formation of reflection cracks in the asphalt surface, which affects the road surface. Performance and life
[0003] When the existing stabilizing materials are applied to the pavement base, the higher the strength, the greater the shrinkage, and the more prone to shrinkage cracking, and most of the stabilizing materials reduce the shrinkage by reducing the strength, such as JTG/T F20-2015 The "Technical Rules for Road Pavement Base Construction" stipulates that the standard value of the 7d age unconfined compressive strength of me

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
  • Modified ardealite stabilized macadam as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] In the present invention, the preparation method of the modified phosphogypsum preferably includes the following steps: mixing the original phosphogypsum, mineral powder and an alkaline activator, and then aging to obtain the modified phosphogypsum. In the present invention, the aging time is preferably 3-45 days. In the present invention, when the temperature is ≥30°C, the aging time is preferably 3d; when the temperature is ≥15°C and <30°C, the aging time is preferably 7d; when the temperature is ≥0°C and <15°C , the aging time is preferably 12d; when the temperature is <0°C, the aging time is preferably 22d-45d.

[0029] In the present invention, the C-S-H gel formed in the aging process is represented by CaSO in phosphogypsum 4Gradually grow the crystal nuclei and wrap them, so that the air-hardening phosphogypsum becomes a hydraulic material. On the one hand, some fine-grained phosphogypsum is cemented into larger granular, blocky, and strong Large particles of p...

Embodiment 1

[0042] A modified phosphogypsum stabilized crushed stone, the composition of the raw materials is as follows in parts by mass: 800 parts of modified phosphogypsum, 65 parts of mineral powder, 1 part of red mud, 9 parts of cement, 1290 parts of crushed stone, 60 parts of chemical fiber, 100 parts of water.

[0043] Among them, the raw materials of the modified phosphogypsum include the following mass fractions: 95% of the original phosphogypsum, the original phosphogypsum is the phosphogypsum that has been stored for more than 3 years, the moisture content is 18.6%, the CaSO 4 The content is 87%, the water-soluble phosphorus content is 0.5%, the water-soluble fluorine content is 0.09%, and the pH value is 3.2; 1% mineral powder, the mineral powder is S95 grade granulated blast furnace slag powder, Al 2 o 3 The content is 11%, the activity index is 99%; 4% of the basic activator, the basic activator is composed of the following raw materials in mass fractions: 84% of P·O 32.5 o...

Embodiment 2

[0052] A modified phosphogypsum stabilized crushed stone. The raw material composition is as follows in parts by mass: 850 parts of modified phosphogypsum, 107 parts of mineral powder, 5 parts of red mud, 15 parts of cement, 1170 parts of crushed stone, 90 parts of chemical fiber, 140 parts of water.

[0053] Among them, the raw materials of the modified phosphogypsum include the following raw materials in mass fraction: 88% of the original phosphogypsum, the original phosphogypsum is the phosphogypsum that has been stockpiled for more than 3 years, the moisture content is 15.2%, the CaSO 4 The content is 86%, the content of water-soluble phosphorus is 0.46%, the content of water-soluble fluorine is 0.1%, and the pH value is 3.1; the mineral powder is 6.4%, and the mineral powder is S95 grade granulated blast furnace slag powder, Al 2 o 3 The content is 11%, the activity index is 99%; 5.6% of the basic activator, the basic activator is P·O 42.5 ordinary portland cement.

[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
Compressive strengthaaaaaaaaaa
Particle sizeaaaaaaaaaa
Particle sizeaaaaaaaaaa
Login to view more

Abstract

The invention relates to the technical field of road building materials, in particular to modified ardealite stabilized macadam and a preparation method and application thereof. The modified ardealite is adopted as a hydraulic material and fully filled among aggregates, all the components are bonded, the early strength of a gravel layer is enhanced, meanwhile, the red mud is matched to regulate and control the micro-expansion effect formed in the hydration process, the resistance of the gravel layer to early shrinkage cracking is improved, chemical fibers are added, the toughness of the chemical fibers is utilized, expansion stress is limited, the anti-fatigue performance of a road base is improved, and cracking caused by excessive expansion in the later strength development process of the gravel layer is avoided. The modified ardealite stabilized macadam provided by the invention can effectively solve the problem of shrinkage cracking of the current road base material, and the service life of the road base is prolonged.

Description

technical field [0001] The invention relates to the technical field of road building materials, in particular to a modified phosphogypsum stabilized crushed stone and its preparation method and application. Background technique [0002] From top to bottom, the road structure is generally divided into asphalt concrete layer, base layer, gravel cushion, compacted soil foundation, etc. Among them, the cement-stabilized graded gravel layer is usually used as the road base, referred to as the water-stabilized layer. Specifically, the graded crushed stone is used as the aggregate, and a certain amount of cementitious material and sufficient mortar volume are used to fill the voids of the aggregate. Pave and compact according to the principle of embedded extrusion. The initial strength of the water-stable layer is high, and the strength increases with age, so it has high service strength, and has good impermeability and frost resistance. The water-stable layer is not muddy when i...

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
IPC IPC(8): C04B28/14C04B18/04C04B16/06E01C3/00
CPCC04B28/143E01C3/00C04B18/0409C04B16/0625C04B16/0633C04B16/0683C04B2111/0075C04B2201/50C04B18/12C04B7/02C04B22/064Y02W30/91
Inventor 吕伟吴赤球龚文辉
Owner 湖北昌耀新材料工程技术研究有限责任公司
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
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap