A four-stage roller compacted concrete suitable for hydropower and water conservancy projects and its preparation method

Abstract

The invention discloses four-graded roller compacted concrete applicable to water conservancy and hydropower engineering and a preparation method. The four-graded roller compacted concrete is prepared from raw materials in parts by weight as follows: 1-5 parts of tin nanoparticles, 8-16 parts of ethylene glycol monobutyl ether, 3-8 parts of polydimethylsiloxane, 47-55 parts of cement, 13-21 parts of a water reducer and 78-86 parts of rubbles, wherein the rubbles comprise extralarge stones, large stones, medium-sized stones and small stones and have the size ranging from 5 mm to 120 mm, and the mass ratio of the extralarge stones to the large stones to the medium-sized stones to the small stones is 4:3:4:1; the water reducer is prepared from ingredients in parts by weight as follows: 16-24 parts of methacrylic acid, 7-15 parts of hydroxyethyl cellulose, 2-6 parts of sodium tetraborate, 5-12 parts of waterborne polyurethane and 0.5-4 parts of linseed oil. The four-graded roller compacted concrete adopts a scientific formula and has remarkable energy-saving and environment-friendly benefits, and the compressive strength, the breaking strength, the impervious grade, the anti-freezing strength and the like are improved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a four-stage roller compacted concrete suitable for hydropower and water conservancy projects and a preparation method thereof. Background technique [0002] Roller compacted concrete is a dry hard cement-poor concrete, which is made of dry hard concrete without slump by mixing Portland cement, pozzolanic admixtures, water, admixtures, sand and grading-controlled coarse aggregate. Use the same transportation and paving equipment as for earth-rock dam construction, and use vibrating rollers for layer compaction. Roller compacted concrete dams not only have the characteristics of small concrete volume, high strength, good anti-seepage performance, and the overflow of the dam body, but also have the advantages of simple, fast, economical construction procedures for earth-rock dams, and the use of large general-purpose machinery. At present, roller compacted concrete has ...

AI Technical Summary

Problems solved by technology

At present, roller compacted concrete has been widely used in water conservancy and hydropower projects, but the traditional roller compacted concrete mixture is hard and cohesive. Therefore, in order to ensure the uniform distribution of aggregates and the long-term durability of the dam, generally The use of secondary and tertiary aggregates, that is, the aggregate particle size is limited to within 80mm, and the advantages of less cementitious materials and low cost of RCC cannot be fully realized; domestic dams generally adopt a layer thickness of 30cm as the secondary, Three-stage RCC pouring layer thickness cannot fully reflect the advantages of rapid paving, rapid rolling and rapid rise of RCC dams

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