Fair-faced concrete for bridge structures under marine environment and preparation method thereof

A technology of fair-faced concrete and bridge structures, applied in the field of building materials, can solve the problems of insufficient durability of fair-faced concrete and the inability to apply bridge structures, etc., achieve the effects of abundant reserves, local materials, and enhanced slump performance

Active Publication Date: 2022-04-26
CHINA RAILWAY MAJOR BRIDGE ENG GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] This application provides a clear-faced concrete for bridge structures under marine environments and a preparation method thereof, to solve the problem that fair-faced concrete in the prior art cannot be applied to bridge structures under marine environments due to insufficient durability

Method used

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  • Fair-faced concrete for bridge structures under marine environment and preparation method thereof
  • Fair-faced concrete for bridge structures under marine environment and preparation method thereof
  • Fair-faced concrete for bridge structures under marine environment and preparation method thereof

Examples

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Embodiment 1

[0036] In this embodiment, the cement is P.O42.5 ordinary Portland cement; the limestone powder is 400 mesh, the calcium carbonate content is 99wt%, and the density is 2.70g / cm 3 , the fluidity ratio is 96.9%; the fluidity ratio of slag powder is 120.4%, and the density is 2.95g / cm 3 , the specific surface area is 469kg / m 2 ;Water-washed metakaolin is produced by thermal activation of North Sea kaolin, with an average particle size of 4.02μm and a BET specific surface area of ​​13.56m 2 / g; SiO in silica fume 2 The content is 95wt%, and the specific surface area is 22437m 2 / kg; the sea sand fineness modulus is 2.60, the chloride ion content is 0.015wt%, and the shell content is 2.8wt%; the river sand fineness modulus is 2.52, and the weight ratio of sea sand to river sand is 1:2; Granite is used as the stone, with continuous gradation of 5mm-16mm and 16mm-25mm. Among them, the weight ratio of 5mm-16mm grading gravel to 16mm-25mm grading gravel is 0.67; Carboxylic acid sup...

Embodiment 2

[0049] In this embodiment, the cement is P.O52.5 ordinary Portland cement; the limestone powder is 600 mesh, the calcium carbonate content is 99wt%, and the density is 2.78g / cm 3 , the fluidity ratio is 100.2%; the fluidity ratio of slag powder is 118.6%, and the density is 2.97g / cm 3 , the specific surface area is 465kg / m 2 ;Water-washed metakaolin is Maoming metakaolin, with an average particle size of 3.88μm and a BET specific surface area of ​​18.06m 2 / g; SiO in silica fume 2 The content is 93wt%, and the specific surface area is 22356m 2 / kg; sea sand fineness modulus is 2.58, chloride ion content is 0.008wt%, shell content is 2.7wt%; river sand fineness modulus is 3.30, wet sand moisture content is 6wt% ~ 6.5wt%, sea sand The weight ratio to river sand is 1:2; the gravel is continuously graded at 5mm-16mm and 16mm-25mm, and the weight ratio of 5mm-16mm-graded gravel to 16mm-25mm-graded gravel is 0.43; high-efficiency water reducer The polycarboxylate high-efficiency...

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Abstract

This application relates to a clear-water concrete for bridge structures in marine environments and a preparation method thereof. The clear-water concrete is composed of cement, limestone powder, ground slag powder, washed metakaolin, silica fume, sea sand, river sand, gravel, Prepared with aqua and water. This application uses local materials and uses sea sand instead of part of river sand, which can reduce the cost of concrete production; secondly, this application uses limestone powder instead of fly ash, which can significantly reduce the color difference of fair-faced concrete, improve the viscosity of concrete, and improve the homogeneity of concrete; at the same time , the application adopts the method of compounding finely ground slag powder, washed metakaolin and silica fume, which can meet the high strength and high durability required by fair-faced concrete for bridge structures in marine environments.

Description

technical field [0001] The application relates to the field of building materials, in particular to a fair-faced concrete for bridge structures in marine environments and a preparation method thereof. Background technique [0002] Various salt ions in seawater, seawater immersion, wind and waves, tidal factors, etc. will all have a great destructive effect on concrete. Therefore, this complex marine environment requires concrete to have good durability. At present, the technical route of single-mixing or compound-mixing of fly ash and slag powder is mostly used for durable concrete in the marine environment. This technical route will cause color difference on the surface of the concrete. However, with the development of the economy and society, bridge structures in marine environments are constantly putting forward higher requirements for the appearance of concrete. Fair-faced concrete is one-time molding, without any decoration on the surface, uniform color, smooth surface...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B111/20C04B111/24C04B111/90
CPCC04B28/04C04B2201/50C04B2111/90C04B2111/20C04B2111/24C04B14/28C04B18/141C04B14/106C04B18/146C04B14/068C04B14/06C04B14/02C04B20/0076C04B2103/302C04B2103/44C04B2103/50C04B2103/304C04B24/383
Inventor 盖珂瑜龙勇刘俊利陈露一袁立宏黄有强
Owner CHINA RAILWAY MAJOR BRIDGE ENG GRP CO LTD
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