A kind of roller compacted concrete and preparation method thereof

Abstract

The invention discloses roller compacted concrete and a preparation method thereof. The roller compacted concrete is prepared from the following raw materials in parts by mass: 100 parts of cement; 90 to 110 parts of coal ash; 40 to 70 parts of metakaolin; 110 to 140 parts of water; 850 to 900 parts of river sand; 1950 to 2050 parts of gravel; and 1 to 3 parts of water reducing agents. The preparation method of the roller compacted concrete comprises the following steps: adding cement, coal ash, metakaolin, water, river sand, gravel and water reducing agents into a blender sequentially, stirring for 3 to 5 minutes, and obtaining the roller compacted concrete. According to the roller compacted concrete and the preparation method thereof, the river sand is used for replacing the traditional machine-made sand to prepare the roller compacted concrete, the production cost is reduced, the metakaolin is added to improve the grading of the river sand, the fine powder content is increased, and the rolled ability, bleeding ability, anti-permeability and physical strength and the like of the roller compacted concrete are significantly improved.

Description

technical field The invention relates to a roller compacted concrete and a preparation method thereof, belonging to the technical field of building materials. Background technique Roller compacted concrete is a kind of dry hard cement-poor concrete, which is often used for rolling construction by rolling machinery. Because of its small amount of cement, it is conducive to concrete temperature control and crack prevention and mechanized operations, and is often used in hydraulic dams. The fine aggregate in RCC mostly adopts machine-made sand, mainly because the content of fine powder in machine-made sand can be adjusted, and the high proportion of fine powder in fine aggregate is to ensure the rollability and flooding of RCC. The foundation of stability has an important influence on the quality of RCC. However, the high production cost of machine-made sand limits its wide application to a large extent. Natural river sand is the main raw material for construction. It is ofte...

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Problems solved by technology

However, the high production cost of machine-made sand limits its wide application to a large extent.

Natural river sand is the main raw material for construction. It is often used to mix concrete and cement mortar. However, due to its low powder content, when mixing roller compacted concrete, its rollability and panning are very poor, so the roller compacted concrete mixing Generally do not use natural river sand

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