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Calcium-magnesium composite expansion agent for super-long and super-thick structural concrete and preparation method thereof

A composite expansion agent and concrete technology, which is applied in the field of expansion agent preparation, can solve the problems of low effective expansion of calcium expansion components and restrictions on production areas, and achieve the effects of optimizing particle gradation, increasing expansion efficiency, and reducing production costs

Active Publication Date: 2021-08-03
ZHENJIANG SOBUTE NEW MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention overcomes the problem of limited raw material origin of the magnesium expansion component of the calcium-magnesium composite expansion agent in the prior art and the problem of low effective expansion of the calcium expansion component, and provides a new type of calcium with easy-to-obtain raw materials, low cost and high expansion efficiency. Magnesium composite expander and preparation method thereof

Method used

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  • Calcium-magnesium composite expansion agent for super-long and super-thick structural concrete and preparation method thereof
  • Calcium-magnesium composite expansion agent for super-long and super-thick structural concrete and preparation method thereof
  • Calcium-magnesium composite expansion agent for super-long and super-thick structural concrete and preparation method thereof

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Embodiment 1

[0030] A preparation method for a calcium-magnesium composite expansion agent for super-long and super-thick structural concrete, comprising the following steps:

[0031](1) put the calcium oxide clinker granule that f-CaO content is 70% into roller press and carry out pre-grinding treatment, the speed of roller press is controlled at 1.4m / s, after calcium oxide clinker is extruded by roller press, Coarse particles with a particle size ≥ 3 mm are screened out by the screening equipment and returned to the roller press for re-extrusion until all the calcium oxide clinker particles are ground into fine particles with a particle size of 0.10mm is returned to the vertical mill for continuous grinding, and the fine powder with a particle size ≤ 0.10mm is sent to the calcium oxide dust collector for processing After collection, the calcium oxide expansion clinker powder required by the present invention can be obtained - the calcium oxide expansion clinker powder whose particle size...

Embodiment 2

[0038] A preparation method for a calcium-magnesium composite expansion agent for super-long and super-thick structural concrete, comprising the following steps:

[0039] (1) put the calcium oxide clinker granule that f-CaO content is 75% into roller press and carry out pre-grinding treatment, the speed of roller press is controlled at 1.5m / s, after calcium oxide clinker is extruded by roller press, Coarse particles with a particle size ≥ 3 mm are screened out by the screening equipment and returned to the roller press for re-extrusion until all the calcium oxide clinker particles are ground into fine particles with a particle size of 0.10mm is returned to the vertical mill for continuous grinding, and the fine powder with a particle size ≤ 0.10mm is sent to the calcium oxide dust collector for processing After collection, the calcium oxide expansion clinker powder required by the present invention can be obtained - the calcium oxide expansion clinker powder whose particle siz...

Embodiment 3

[0046] A preparation method for a calcium-magnesium composite expansion agent for super-long and super-thick structural concrete, comprising the following steps:

[0047] (1) The calcium oxide clinker granules with f-CaO content of 80% are put into a roller press for pre-grinding treatment, the speed of the roller press is controlled at 1.5m / s, after the calcium oxide clinker is extruded by the roller press, Coarse particles with a particle size ≥ 3 mm are screened out by the screening equipment and returned to the roller press for re-extrusion until all the calcium oxide clinker particles are ground into fine particles with a particle size of 0.10mm is returned to the vertical mill for continuous grinding, and the fine powder with a particle size ≤ 0.10mm is sent to the calcium oxide dust collector for processing After collection, the calcium oxide expansion clinker powder required by the present invention can be obtained - the calcium oxide expansion clinker powder whose par...

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Abstract

The invention discloses a calcium-magnesium composite expansion agent for super-long and super-thick structural concrete and a preparation method thereof. The calcium-magnesium composite expansion agent of the present invention is composed of a calcium expansion component and a magnesium expansion component, and the calcium expansion component is calcium oxide expansion clinker powder with particle gradation optimized through a grinding process. Light-burned magnesia as a magnesia expansion component is prepared by calcining and decomposing dolomite. The present invention uses dolomite with abundant reserves as the raw material to prepare the magnesium expansion component in the calcium-magnesium composite expansion agent, and uses the calcium oxide expansion clinker powder with optimized particle gradation as the calcium expansion component, which solves the problem of calcium expansion very well. In the magnesium composite expansion agent, the limitation of the origin of the raw materials of the magnesium expansion component and the problem of low effective expansion of the calcium expansion component reduce the production cost of the calcium magnesium composite expansion agent and improve the performance of the calcium magnesium composite expansion agent in ultra-long and ultra-thick The application effect in structural concrete provides market competitiveness for the popularization and application of calcium-magnesium composite expansion agent, and has significant social and economic benefits.

Description

technical field [0001] The invention relates to a preparation method of an expansion agent, in particular to a calcium-magnesium composite expansion agent for ultra-long and ultra-thick structural concrete with a low water-binder ratio and a preparation method thereof. Background technique [0002] Shrinkage-compensated concrete is an ideal material for structural self-waterproofing, and expansion agent is an essential component for preparing shrinkage-compensated concrete. The expansion agents that are widely circulated in the market in my country are calcium sulfoaluminate expansion agent, calcium oxide expansion agent and calcium sulfoaluminate calcium oxide composite expansion agent. These expansion agents have many advantages in the application of ordinary concrete projects, and can effectively compensate for the early self-drying shrinkage and drying shrinkage of concrete, but they are extremely long and thick when the hydration temperature rises, there are few tempera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/06
CPCC04B40/0046C04B22/066C04B22/064
Inventor 张守治王育江姚婷王瑞穆松
Owner ZHENJIANG SOBUTE NEW MATERIAL CO LTD
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