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Modified cement and application thereof

A cement and modification technology, which is applied in the field of building material preparation, can solve the problems of reducing the durability of concrete structures, and achieve the effects of improving electrochemical corrosion resistance, improving later strength, and improving impermeability.

Inactive Publication Date: 2013-06-05
DALIAN MARITIME UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] In view of the above problems, the purpose of the present invention is to develop a high-performance cement and concrete suitable for the northern coastal environment with significant resistance to seawater electrochemical erosion, thereby solving the problem of reduced durability of concrete structures in the northern coastal areas subjected to seawater erosion

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Embodiment 1

[0032] (1) The slag micropowder used in the present invention is the S95 grade slag micropowder produced by Dalian Jinqiao Superfine Powder Co., Ltd., and its particle size is 6.5~8.4 μm, figure 1 (a) The microscopic morphology of slag powder is given; the nano-clay is nano-kaolin produced by Hebei Xingtai Hualiang Rubber and Plastic Material Co., Ltd., with an average particle diameter of 300-500nm and an average sheet thickness of 20-50nm. figure 1 (b) The microstructure of nanoclay is given; the water reducer used is β-naphthalene sulfonate formaldehyde polymer high-efficiency water reducer produced by Dalian Bangda Building Materials Co., Ltd.; the cement is PO· 42.5R ordinary Portland cement; the sand is sand from a large river, and the gravel is crushed stone of 1-3mm.

[0033] (2) Test concrete specimen mix ratio

[0034] In this test, the amount of slag powder is selected as 50% of the total mass of the cementitious material, the nano-clay accounts for 1% of the tot...

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Abstract

The invention relates to modified cement and application thereof, belonging to the field of preparation of construction materials. The modified cement is characterized in that the modified cement comprises a cementing material and an additive, wherein the cementing material is composed of normal cement and slag micropowder, and the slag micropowder accounts for 40-60% of the total weight of the cementing material; and additive is composed of nano clay particles and a water reducing agent, the weight of the nano clay particles is 1% of the total weight of the cementing material, and the weight of the water reducing agent is 1.5-2% of the total weight of the cementing material. According to the invention, heavily-doped slag micropowder high-performance concrete is prepared by selecting materials as required according to the mixture ratio, the electrochemical etching resistance of the concrete can be obviously enhanced, the impermeability can be enhanced by 40-60%, the freezing resistance can be enhanced by more than 30%, the steel bar rust resistance can be enhanced 2-4 times, and the service life of a concrete structure can be prolonged 3-4 times.

Description

technical field [0001] The invention relates to a modified cement and its application, in particular to a large-volume slag micropowder high-performance cement and concrete suitable for resisting seawater electrochemical corrosion in the northern coastal environment, and belongs to the field of building material preparation. Background technique [0002] The concrete structure in the northern coastal areas of my country is not only corroded by chloride ions in seawater, causing corrosion of steel bars, but also suffers from freeze-thaw damage in cold winter, resulting in cracking and damage of concrete, and making it easier for chloride ions to intrude, which intensifies the corrosion of concrete. The destruction of the structure reduces the durability of the concrete structure, shortens its service life, and causes serious losses to the society. How to improve the seawater erosion resistance of the concrete structure in the northern coastal environment and improve its durabil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B24/22
Inventor 范颖芳张世义李宁宁
Owner DALIAN MARITIME UNIVERSITY
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