Fair-faced concrete and application thereof

Abstract

The invention relates to fair-faced concrete. The fair-faced concrete is prepared from a binding material, a composite water reducer, water and aggregate, wherein the amount of the binding material in the fair-faced concrete is 380-480kg / m<3>; the binding material comprises the following components in parts by weight: 45-70 parts of cement, 10-30 parts of coal ashes and 20-50 parts of granulated blast-furnace slag; the amount of the composite water reducer accounts for 0.5%-1.1% of the binding material; the composite water reducer comprises a polycarboxylate superplasticizer, a defoamer, an air entraining agent and a tackifier; the amount of water accounts for 0.32-0.45 times of the binding material; and the balance is the aggregate. The invention further relates to an application of the fair-faced concrete in ocean engineering construction. The fair-faced concrete provided by the invention is excellent in chloride ion permeability resistance, smooth in surface, and uniform in color and luster; the sum of the area of air bubbles of which the surface area is greater than 1m<2> is not greater than 6*10<-4>m<2>; the maximal diameter of the air bubbles is not greater than 5mm; the depth is not greater than 5mm; and the fair-faced concrete is low in air content and bleeding rate, and can be used in an ocean environment for a long period of time.

Description

technical field [0001] The invention belongs to the field of civil construction engineering, and in particular relates to a high-performance fair-faced concrete used in marine engineering construction. Background technique [0002] At present, for buildings or structures with high requirements on appearance quality, stone, glass curtain wall and steel structure are generally used as decoration materials. In the marine environment, because building materials will face the problem of anti-seawater or salt spray erosion, especially for iconic buildings with a design service life of more than 100 years and high requirements for appearance design, stone, glass curtain walls and steel structures And other building materials will have the problem of not being resistant to seawater or salt spray erosion or having a low service life. [0003] Fair-faced concrete refers to concrete that directly uses the natural texture of concrete after one-time molding or only paints a colorless pr...

AI Technical Summary

Problems solved by technology

However, due to the extremely high performance requirements of concrete strength, air content rate, bleeding rate, and chloride ion penetration resistance in marine engineering construction, it is difficult for the existing fair-faced concrete to be used in marine engineering for a long time

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