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Calcium-magnesium composite expansion clinker, preparation method thereof and application of calcium-magnesium composite expansion clinker in low-shrinkage and high-crack-resistance marine mass concrete

A technology of expansive clinker and composite expansive agent, which is applied in the direction of cement production, etc., can solve the problems of difficulty in improving the crack resistance of concrete, rising prices, and complex processes, so as to improve the mechanical properties in the later stage, reduce invalid expansion, and make the preparation process simple and easy line effect

Active Publication Date: 2022-08-02
SOUTHEAST UNIV +2
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The present invention overcomes the complicated process in the production of calcium-magnesium composite expansion agent in the prior art, the limitation of resource origin and price rise of raw material magnesite, and the traditional calcium-magnesium composite expansion agent. The expansion agent can not achieve the purpose of regulating the expansion process, almost all the expansion of the CaO component is lost in the plastic stage of the cement-based material, and it is difficult to improve the crack resistance of the concrete. The present invention provides a calcium-magnesium composite expansion clinker and its The preparation method and its application in the preparation of low-shrinkage, high-crack-resistant marine mass concrete, the calcium-magnesium composite expansive clinker can regulate the expansion rate of free calcium oxide on the one hand, and on the other hand, increase the cement-based clinker mixed with expansive clinker. Later mechanical properties of materials

Method used

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  • Calcium-magnesium composite expansion clinker, preparation method thereof and application of calcium-magnesium composite expansion clinker in low-shrinkage and high-crack-resistance marine mass concrete
  • Calcium-magnesium composite expansion clinker, preparation method thereof and application of calcium-magnesium composite expansion clinker in low-shrinkage and high-crack-resistance marine mass concrete
  • Calcium-magnesium composite expansion clinker, preparation method thereof and application of calcium-magnesium composite expansion clinker in low-shrinkage and high-crack-resistance marine mass concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 4

[0105]The performance test results of the low-shrinkage, high-crack-resistant marine mass concrete (C30) prepared by Examples 4 to 6, Reference Example 2, and Comparative Example 4 are shown in Table 5 below:

[0106] table 5

[0107]

[0108] Remarks: In the 28d autogenous volume deformation at 20°C, "-" means the concrete is in a shrinking state, and "+" means that the concrete is in an expanding state.

[0109] With the addition of the prepared calcium-magnesium composite expansion agent, compared with the same strength grade, that is, the standard example 2 ordinary marine mass concrete and the concrete obtained by using the commercially available expansion agent (comparative example 4 (6-1#)), The concrete prepared by the invention has good working performance (slump / expansion), volume stability (28d autogenous volume deformation, 60d drying shrinkage deformation) and impermeability and anti-corrosion grades. The marine bulk concrete prepared by the invention has low ...

Embodiment 3

[0148] The experimental results of Example 3 and Comparative Example 2 show the important role of alumina in the system of this invention, and the free calcium oxide produced by the decomposition of alumina and dolomite is fully reacted to generate monocalcium dialuminate (CA). 2 ), directional melting and wrapping on the surface of the free calcium oxide of the calcareous expansion component produced by the decomposition of dolomite to form monocalcium dialuminate melt-wrapped minerals, which can better reduce the ineffective expansion of the calcareous expansion component in the plastic stage and improve the calcium The expansion performance of the mass expansion component improves the later mechanical properties of the cement-based material mixed with the expansion agent; the solid-phase reaction between alumina and free barium oxide particles forms an inclusion of barium aluminate wrapped around the barium oxide, which improves the expansion of the expansion agent. efficacy...

Embodiment 7

[0149] The experimental results of Example 7 and Comparative Example 6 show that in the presence of anhydrite, the barium hydroxide and anhydrite crystals formed by the hydration of barium oxide and barium aluminate act to block the internal pores of the concrete and improve the performance of the concrete. Corrosion resistance of ; Ba in surface concrete 2+ Compatible with SO in seawater 4 2- The ions combine to form an insoluble barium sulfate crystal protective layer, which effectively improves the resistance to sulfate corrosion; and the barium sulfate (barite) formed in the concrete system has certain radiation protection properties.

[0150]The radiation-proof calcium-magnesium composite expansion agent for concrete provided by the invention and the preparation method thereof, compared with the resource origin limitation of magnesite, the raw material of the magnesia expansion component of the existing calcium-magnesium composite expansion agent, the invention makes ful...

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Abstract

The invention discloses a calcium-magnesium composite expansion clinker, a preparation method thereof and application of the calcium-magnesium composite expansion clinker in low-shrinkage and high-crack-resistance marine mass concrete.The calcium-magnesium composite expansion clinker is prepared from, by mass, 16-30% of calcium oxide, 6-11% of monocalcium dialuminate, 26-50% of barium oxide, 9-16% of barium aluminate and the balance magnesium oxide; monocalcium dialuminate wraps the surface of free calcium oxide, and barium aluminate wraps the surface of barium oxide. Monocalcium dialuminate is formed to melt and wrap free calcium oxide, hydration of the free calcium oxide is delayed, and invalid expansion of calcium expansion components in the plastic stage is reduced; the expansion efficiency of the expanding agent is improved through a formed inclusion of wrapping barium oxide with barium aluminate; barium oxide and barium aluminate are hydrated to expand, generated barium hydroxide forms barium sulfate crystals under the action of anhydrite, and barite crystals formed in a cement system have radiation-proof performance.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a calcium-magnesium composite expansion clinker, a preparation method thereof, and its application in low-shrinkage and high-cracking-resistant marine mass concrete. Background technique [0002] With the formulation and implementation of my country's marine resources development strategy, construction projects such as cross-sea bridges, cross-sea tunnels, and offshore deep-water ports are increasing. In the construction of marine and coastal structures, concrete and steel bars are the main materials at present. For concrete structures in seawater environment, chloride ions and other components in seawater are gradually immersed into concrete by diffusion under the action of concentration gradients, causing erosion of concrete and corrosion of internal steel bars, which seriously affects the durability of concrete structures. Once the large-volume concrete in the envi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/14C04B28/02C04B111/20C04B111/24C04B111/27C04B111/34
CPCC04B40/0046C04B28/02C04B2201/50C04B2111/27C04B2111/00293C04B2111/20C04B2111/343C04B2111/24C04B14/28C04B14/303C04B14/26C04B22/143C04B40/0042C04B18/08C04B18/141C04B14/06C04B14/02C04B2103/302Y02P40/10
Inventor 刘加平王康臣陆安群苏志东宋神友徐文金文良王育江邹威蔡依花
Owner SOUTHEAST UNIV
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