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Seawater mixed cement-based cementing material

A cementitious material and cement-based technology, applied in the field of cement materials, can solve problems such as poor anti-penetration effect, and achieve the effects of excellent volume stability, good working performance and less calcium hydroxide

Active Publication Date: 2019-04-02
JIAHUA SPECIAL CEMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] (2) Only by modifying metakaolin to refine the pore distribution in concrete, and then improve the anti-chloride ion penetration performance of concrete, the anti-penetration effect is not good

Method used

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  • Seawater mixed cement-based cementing material
  • Seawater mixed cement-based cementing material
  • Seawater mixed cement-based cementing material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The invention includes a cement-based cementitious material mixed with seawater, which comprises 74% of micro-expansion low-heat Portland cement, 5% of limestone powder, 15% of metakaolin, 5% of silica fume and 1% by weight. % Nano-CaCO 3 .

[0025] In actual production, due to micro-expansion low-heat Portland cement particles, limestone powder particles, metakaolin particles, silica fume particles and nano-CaCO 3 The particle size of the particles cannot be expressed by a specific mesh number, so it is expressed by continuous gradation. Among them, the particle size range of micro-expansion low-heat Portland cement is 180 mesh to 400 mesh; the particle size range of limestone powder is 400 mesh to 800 mesh; the particle size range of metakaolin is 800 mesh to 2000 mesh; the particle size range of silica fume is 2000 mesh Mesh ~ 8000 mesh; Nano CaCO 3 The particle size is greater than 8000 mesh, that is, nano-CaCO 3 The maximum size is 8000 mesh.

[0026] Active S...

Embodiment 2

[0037] The invention includes a cement-based cementitious material mixed with seawater, which comprises 91.5% micro-expansion low-heat Portland cement, 2% limestone powder, 5% metakaolin, 1% silica fume and 0.5% by weight percentage. % Nano-CaCO 3 .

[0038] Among them, the particle size range of micro-expansion low-heat Portland cement is 180 mesh to 400 mesh; the particle size range of limestone powder is 400 mesh to 800 mesh; the particle size range of metakaolin is 800 mesh to 2000 mesh; the particle size range of silica fume is 2000 mesh Mesh ~ 8000 mesh; Nano CaCO 3 The particle size is greater than 8000 mesh.

[0039] Active SiO in the metakaolin 2 The content is greater than 50%; the main component of the silica fume is active SiO 2 , the content is greater than 90%.

[0040]Weigh each component according to the above weight percentage and place it in a mixer, and stir evenly to obtain a cement-based cementitious material. The dense packing density of the cementit...

Embodiment 3

[0050] The invention includes a cement-based cementitious material mixed with seawater, which comprises 91.5% micro-expansion low-heat Portland cement, 2% limestone powder, 5% metakaolin, 1% silica fume and 0.5% by weight percentage. % Nano-CaCO 3 .

[0051] Among them, the particle size range of micro-expansion low-heat Portland cement is 120 mesh to 400 mesh; the particle size range of limestone powder is 400 mesh to 1000 mesh; the particle size range of metakaolin is 600 mesh to 3000 mesh; the particle size range of silica fume is 1000 mesh ~ 8000 mesh; Nano CaCO 3 The particle size is greater than 8000 mesh.

[0052] Active SiO in the metakaolin 2 The content is greater than 50%; the main component of the silica fume is active SiO 2 , the content is greater than 90%.

[0053] Weigh each component according to the above weight percentage and place it in a mixer, and stir evenly to obtain a cement-based cementitious material. The dense packing density of the cementitiou...

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Abstract

The invention relates to the field of cement materials, particularly to a seawater mixed cement-based cementing material, which comprises, by weight, 74-91.5% of micro-expanded low-heat Portland cement, 2-5% of limestone powder, 5-15% of metakaolin, 1-5% of silica fume, and 0.5-1% of nanometer CaCO3, wherein the micro-expanded low-heat Portland cement particles have a particle size of 120-400 mesh, the limestone powder particles have a particle size of 400-1000 mesh, the metakaolin particles have a particle size of 600-3000 mesh, the silica fume particles have a particle size of 1000-8000 mesh, and the nanometer CaCO3 particles have a particle size of more than 8000 mesh. According to the present invention, based on the theory of close packing, the raw materials with different particle sizes and different proportions are rationally utilized, such that the cement stone has low alkalinity and compact structure in the case of seawater mixing and curing so as to effectively reduce or blockthe chemical corrosion on the mudstone, solve the problem of seawater corrosion, effectively meet the use conditions of marine engineering, fully utilize the seawater, and solve the problem of lack of fresh water for construction in the island reef project.

Description

technical field [0001] The invention relates to the field of cement materials, in particular to a cement-based cementitious material mixed with seawater. Background technique [0002] my country is a large ocean country. In recent years, the construction of marine islands and reefs is facing heavy tasks. The construction of civil and military docks, offshore airports, offshore wind power stations, offshore lighthouses and radar stations, and frontier fortifications on islands and reefs is in full swing. The core technology of high-performance marine concrete is cement-based cementitious material technology and concrete admixture (including water reducing agent and steel embroidery agent, etc.) technology. [0003] Some studies have pointed out that the concrete prepared by mixing Portland cement with seawater has short setting time, rapid early strength development, long-term strength shrinkage, poor frost resistance, fast steel corrosion, and the presence of SO in seawater. ...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B40/02C04B111/24
CPCC04B28/04C04B40/0286C04B2111/00017C04B2111/24C04B2201/50C04B14/28C04B14/106C04B18/146C04B22/0026
Inventor 王宁林燕杨涛胡继宗
Owner JIAHUA SPECIAL CEMENT
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