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Concrete aggregate with core-shell structure as well as preparation method and application of concrete aggregate

A technology of concrete aggregate and core-shell structure, which is applied in the field of concrete aggregate, can solve the problems that the surface leaching behavior of heavy metal ions cannot be fundamentally suppressed, and the cement-based materials are not sufficiently consolidated, so as to inhibit the leaching of heavy metals, average anti- High compressive strength, effect of inhibiting leaching

Pending Publication Date: 2022-06-21
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing packaging technology mainly uses hazardous solid waste as auxiliary cementitious material (or aggregate) to directly prepare cement-based materials, which cannot fundamentally inhibit the surface leaching behavior of heavy metal ions, and there are dangerous solid waste and consolidation. Insufficient consolidation of cement-based materials

Method used

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  • Concrete aggregate with core-shell structure as well as preparation method and application of concrete aggregate
  • Concrete aggregate with core-shell structure as well as preparation method and application of concrete aggregate
  • Concrete aggregate with core-shell structure as well as preparation method and application of concrete aggregate

Examples

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preparation example Construction

[0026] The preparation raw materials of the inner core include: hazardous solid waste and water;

[0027] The raw materials for preparing the shell include: Portland cement, silica fume, polycarboxylate water reducing agent and water.

[0028] In the present invention, unless otherwise specified, the substances are all commercially available products well known to those skilled in the art.

[0029] In the present invention, the core-shell structure concrete aggregate includes an inner core and an outer shell surrounding the inner core.

[0030] In the present invention, the preparation raw materials of the inner core include: hazardous solid waste and water.

[0031] In the present invention, the hazardous solid waste preferably includes one or more of red mud, tailings and coal gangue. In the present invention, the tailings preferably include one or more of lead-zinc tailings and copper tailings. The source of the hazardous solid waste is not particularly limited in the pr...

Embodiment 1

[0068] The original red mud was pulverized by a jaw crusher, dried at 105°C for 6 hours, the red mud had a constant weight, and the dried red mud was pulverized by a sample preparation pulverizer to obtain red mud with an average particle size of ≤100 μm;

[0069] The red mud and water were mixed in a mass ratio of 1000:240, put into a spherical mold with an inner cavity diameter of 5 mm, cured at 25°C for 24 hours, and demolded to obtain an inner core;

[0070] Dry mixing 52.5 grade Portland cement and silica fume (with an average particle size of 300 nm and an activity index ≥ 100%) according to a mass ratio of 1000:200 to obtain a first premix; the obtained first premix, polycarboxylate The acid water reducing agent and water are mixed according to the mass ratio of 1200:30:200 to obtain shell slurry;

[0071] The obtained shell slurry is smeared on the surface of the inner core, and then the obtained primary aggregate is rolled to obtain the core-shell structure concrete a...

Embodiment 2

[0074] In the core-shell structure concrete aggregate, the diameter of the inner core is 5 mm, the thickness of the outer shell is 1.5 mm, and other technical means are the same as those in Example 1, and the core-shell structure concrete aggregate is obtained.

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Abstract

The invention belongs to the technical field of concrete aggregates, and particularly relates to a concrete aggregate with a core-shell structure as well as a preparation method and application thereof. The invention provides concrete aggregate with a core-shell structure. The concrete aggregate comprises an inner core and an outer shell wrapping the inner core, the inner core is prepared from dangerous solid waste powder and water; the shell is prepared from the following raw materials: Portland cement, silica fume, a polycarboxylate superplasticizer and water. According to the invention, the preparation raw materials of the inner core preliminarily form a stable consolidated body; the shell composition can be subjected to pozzolanic reaction with active components in the dangerous solid waste in the inner core, the microstructure of an interface transition area is improved, tight combination of the inner core and the shell is promoted, the dangerous solid waste is stably sealed in the shell, and surface leaching of heavy metal ions is effectively prevented; in addition, the shell composition is large in early-stage shrinkage and can play a physical compaction role, the mechanical strength of the core-shell structure concrete aggregate is further improved, and high-quality aggregate preparation is achieved.

Description

technical field [0001] The invention belongs to the technical field of concrete aggregates, and particularly relates to a core-shell structure concrete aggregate and a preparation method and application thereof. Background technique [0002] Hazardous solid waste includes materials such as tailings, red mud and coal gangue. At present, underground landfill is the main treatment method for hazardous solid waste. However, after landfill treatment, harmful components such as lye and heavy metal ions in hazardous waste are easily leached, causing soil and groundwater pollution. At the same time, there is a risk of dam failure due to a large amount of accumulated hazardous solid waste. Therefore, there is an urgent need for a safe disposal method for large quantities of hazardous solid waste. [0003] Using cement-based materials to solidify hazardous solid waste is an effective solid waste treatment method. On the one hand, C-S-H gel, the main hydration product of cement, has ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/10C04B28/04B09B3/25
CPCC04B20/1077C04B28/04C04B2111/00017C04B2201/50C04B18/0409C04B20/1055C04B20/1029C04B18/146C04B2103/302
Inventor 侯东帅王鑫鹏李萌萌武迪李冠男
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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