Four-graded roller compacted concrete suitable for water power hydraulic engineering and preparation method thereof

Abstract

The invention provides four-graded roller compacted concrete suitable for water power hydraulic engineering, the four-graded roller compacted concrete per cubic meter comprises the following components: 49kg-64kg of cement, 78kg-92kg of fly ash, 70kg-71kg of water, 630kg-700kg of sand, 1520kg-1610kg of gravel, 0.98kg-1.42kg of a high efficiency water reducing agent and 0.07kg-0.14kg of an air entraining agent, the mass ratio of super large stone (80mm-120mm): large stone (40mm-80mm): middle stone (20mm-40m m): small stone (5mm-20mm) is 20:30:30:20. The four-graded roller compacted concrete is low in cementitious material use amount and low in adiabatic temperature rise, has good working performance, mechanical performance and durability, and can simplify the temperature control measures, improve the construction progress, and reduce cost.

Description

technical field [0001] The invention relates to the technical field of water conservancy project construction, 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 dam is a dam-building technology developed in the early 1980s. Unlike normal concrete dam-building, which uses a vibrator to insert and vibrate compactly, roller-compacted concrete uses vibrating rollers for strong vibration and rolling. It is a new method of concrete construction that compacts adhesive materials and dry hard concrete together. Its main features are the use of dry hard concrete with low cement content and high fly ash content, using the same transportation and paving equipment as the earth-rock dam, thin-layer paving, vibratory rolling, and layer-by-layer filling. [0003] Roller compacted concrete dam is a major breakthrough in the history of dam bui...

AI Technical Summary

Problems solved by technology

[0005] (1) The traditional RCC mixture is dry and hard, and its cohesion is poor. Therefore, in order to ensure the uniform distribution of aggregates and the long-term durability of the dam, two or three grades of aggregates are generally used, that is, aggregate pellets The diameter is limited within 80mm, and the advantages of less cementitious material and low cost of RCC cannot be fully realized;

[0006] (2) Domestic dams generally use 30cm layer thickness as the layer thickness of the secondary and tertiary RCC pouring layers, which cannot fully reflect the advantages of rapid paving, rapid rolling, and rapid rise of RCC dams

[0008] (1) New breakthroughs and developments are urgently needed in the design theory of RCC mix ratio, especially the theoretical and experimental research on improving aggregate gradation (maximum particle size), increasing pouring layer thickness, and adaptability of rolling equipment. is blank;

[0009] (2) For roller compacted concrete, due to the increase of aggregate particle size, it may cause a series of problems such as concrete aggregate separation, poor aggregate wrapping performance, and internal defects of concrete.

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