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Functional aggregate and preparation method thereof

A technology with a set of functions and functions, applied in the field of concrete materials, can solve the problems of reducing the combination of aggregates and cement stones, and achieve the effects of adjusting and controlling the formation of cement stones, reducing self-shrinkage, and promoting hydration

Inactive Publication Date: 2013-01-02
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, high-strength lightweight aggregates often show obvious enamel on the surface after high-temperature treatment, which reduces the combination of aggregates and cement stones.

Method used

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  • Functional aggregate and preparation method thereof
  • Functional aggregate and preparation method thereof
  • Functional aggregate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) Ingredients: According to Table 2, Table 3 and Table 5, the corresponding ingredients are carried out, and the chemical composition and loss on ignition LOI of the matrix raw meal thus prepared are shown in Table 4. Wherein the chemical composition content and loss on ignition LOI of each raw material in this embodiment are shown in Table 1.

[0033] (2) Grinding: Put the prepared matrix raw material into a ball mill for grinding for 4 hours, control the particle size of the raw material at 325 mesh, add 22% water of the matrix raw material, mix well, seal with a plastic film, and stale for 3 hours; The raw material of the permanent surface activation layer, that is, Portland cement clinker, was ground by a ball mill for 4 hours, and the particle size was controlled at 325 mesh, and it was set aside.

[0034] (3) Molding: the stale matrix is ​​manually molded (extrusion molding is also possible) to make a small ball with a diameter of 10 mm. Then the powder of the ...

Embodiment 2

[0045] (1) Ingredients: According to Table 2, Table 3 and Table 5, the corresponding ingredients are carried out, and the chemical composition and loss on ignition LOI of the matrix raw meal thus prepared are shown in Table 4.

[0046] (2) Grinding: Put the prepared matrix raw material into a ball mill for grinding for 4 hours, control the particle size of the raw material at 325 mesh, add 30% water of the matrix raw material, mix well, seal with a plastic film, and stale for 2 hours; The raw materials of the surface active layer were pulverized by a ball mill for 4 hours, and the particle size was controlled at 325 meshes, and they were set aside.

[0047] (3) Molding: the stale substrate is manually molded (extrusion molding is also possible) to make a ball with a diameter of 15mm. Then the alkaline surface active layer powder is wrapped as evenly as possible on the surface of the matrix pellet (rotary molding method can be used), and the secondary molding is carried out. Th...

Embodiment 3

[0054] (1) Ingredients: According to Table 2, Table 3 and Table 5, the corresponding ingredients are carried out, and the chemical composition and loss on ignition LOI of the matrix raw meal thus prepared are shown in Table 4.

[0055] (2) Grinding: Put the prepared matrix raw material into a ball mill for grinding for 4 hours, control the particle size of the raw material at 325 mesh, add water and mix evenly, seal it with a plastic film, and put it stale; grind the raw material of the alkaline surface active layer with a ball mill 4 hours, control the particle size at 325 mesh, and set aside.

[0056] (3) Molding: the stale matrix is ​​manually molded (extrusion molding is also possible) to make small balls. Then wrap the alkaline surface active layer powder on the surface of the matrix pellet as evenly as possible (rotational molding can be used), and perform secondary molding. The overmolded samples were dried to constant weight.

[0057] (4) Sintering: The sintering tem...

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Abstract

The invention belongs to the field of concrete materials, and specifically relates to a functional aggregate and a preparation method thereof. The functional aggregate is characterized in that: the functional aggregate has a core-shell structure, and is composed of a porous core substrate and an alkaline surface active shell. Mullite is a main mineral phase of the porous core substrate, and a continuous phase is formed. Pores are distributed in the continuous phase. The pore sizes of the pores are distributed in a multilevel form. The pores are mainly micron-leveled pores. The mineral phase of the alkaline surface active shell is mainly composed of dicalcium silicate, tricalcium silicate, tricalcium aluminate, and tetracalcium iron aluminate. The functional aggregate provided by the invention has light weight and high strength. The functional aggregate can be internally cured, and has a surface active layer. When the functional aggregate is used in concrete, an interfacial transition zone (ITZ) can be completely enhanced and improved, cement stone structure formation can be regulated, and concrete overall performance can be improved. The preparation process is simple and controllable, and is easy to operate.

Description

technical field [0001] The invention belongs to the field of concrete materials, and in particular relates to a functional aggregate and a preparation method thereof. Background technique [0002] Concrete is currently the most widely used artificially prepared building material in the world. With the rapid development of the construction industry, the demand for concrete is also increasing. The effective use of concrete resources is directly related to major national strategic issues such as energy, resource consumption, and ecological environment protection, and is a major issue that needs to be resolved urgently. As a multi-phase composite material, the matching of the performance of concrete phases and the existence of weak interface transition zone are the most important issues affecting the structure and performance. The interface between phases, especially the interface between cement stone and aggregate, has a very important influence on the mechanical properties an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B14/04
Inventor 王发洲杨婷婷胡曙光商得辰
Owner WUHAN UNIV OF TECH
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