Maritime concrete cement

A technology for marine concrete and cement, applied in the field of cement, can solve the problems of increased self-shrinkage of marine concrete, cracking of concrete, large difference in viscosity of mixture, etc., and achieves the effects of good resistance to chloride ion diffusion and high crack resistance.

Active Publication Date: 2010-03-03
ZHEJIANG MINGFENG CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to invent a high-durability marine concrete suitable for marine structures to overcome defects such as increased self-shrinkage of existing marine concrete, concrete cracking, decreased ability of hydrates to bind chloride ions, and large difference in viscosity of the mixture. Concrete cement and its production process

Method used

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Embodiment approach

[0018] The present invention has following four kinds of embodiments, and the percentage by weight of material formula is as follows:

[0019] 1. Cement clinker 35%;

[0020] Ground slag powder 40%;

[0021] Fly ash 20%;

[0022] Gypsum 5%;

[0023] Among them, the fineness of cement clinker, fly ash, and gypsum is controlled at about 360M2 / Kg, and the fineness of mixed slag powder is controlled at about 400M2 / Kg.

[0024] 2. Cement clinker 33%;

[0025] Ground slag powder 40%;

[0026] Fly ash 22%;

[0027] Gypsum 5%;

[0028] Among them, the grinding fineness of cement clinker, fly ash and gypsum is controlled at about 380M2 / Kg; the fineness of mixed slag powder is controlled at about 380M2 / Kg, and the modified material-1 is added. Between 1 and 3 percent.

[0029] The modified material-1, also known as benchmark adjustment agent, is a liquid reagent whose main function is to modify sulfate ions in cement and control the hydration expansion rate of concrete at variou...

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Abstract

The invention relates to maritime concrete cement, in particular to chloride ion erosion resisting maritime concrete cement, which comprises the following components in percentage by weight: 30 to 35 percent of cement clinker, 40 to 45 percent of finely ground slag, 20 to 25 percent of fly ash and 5 to 8 percent of gypsum. A test result shows that the compressive strength of the cement at the 3rdday and the 28th day is 15.2 to 22.7MPa, and 45.6 to 58.0MPa respectively and both the soundness and the setting time of the cement meet the requirements of the ordinary Portland cement (GB175-2007);and the cement has good chlorine ion corrosion resistance. The cement is relatively high in crack resistance and good in chlorine ion diffusion resistance and meets the material parameters and proportioning scheme of the conventional physical mechanical properties of the maritime cement.

Description

technical field [0001] The invention is a kind of cement, especially a kind of marine concrete cement which resists chloride ion erosion. Background technique [0002] For a long time, the durability of harbor wharves and other marine reinforced concrete structures has been a major problem in engineering circles. The superiority of the large-volume admixture concrete technology adopted in China in the past ten years in terms of concrete resistance to chloride ion erosion has been extensively demonstrated in theory and long-term application in foreign projects. However, due to the fact that high-performance concrete with marine admixtures has not been widely used in China for a long time, there is a lack of deep understanding of the long-term durability behavior characteristics of marine concrete. In terms of control, there are still some misunderstandings and deficiencies. Many concretes used in marine constructions blindly emphasize the short-term high compactness of concr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B18/12C04B18/08C04B22/14C04B111/24
CPCC04B2111/24C04B2201/52C04B28/14Y02W30/91C04B7/02C04B18/08C04B18/142
Inventor 王瑶法
Owner ZHEJIANG MINGFENG CEMENT
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