Nuclear power concrete additive and preparation method thereof

Abstract

The invention which belongs to the technical field of nuclear power concrete especially relates to a nuclear power concrete additive. The nuclear power concrete additive is prepared from the following raw materials, by mass, 30-80% of a polycarboxylic acid water reducer, 10-30% of a polycarboxylic acid slump retaining agent, 1-15% of a retarder, 0-0.5% of a water retaining agent, 0.1-2% of an air entraining agent, 1-20% of a shrinkage reducing agent, 0-0.5% of an antiseptic, 0.05-0.5% of a defoamer, and the balance water. The additive of the invention, which has the functions of concrete workability improvement, retardation (avoiding of cold seams caused by long-time construction), concrete temperature peak value reduction, concrete drying contraction reduction, introduction of minimal steam bubbles into concrete, concrete endurance improvement and the like, allows concrete to satisfy engineering needs.

Description

technical field [0001] The invention belongs to the technical field of nuclear power concrete, in particular to a nuclear island concrete admixture. Background technique [0002] AP1000 nuclear power technology, AP1000 is an advanced passive pressurized water reactor nuclear power technology. The nuclear fuel made of uranium is fissioned in the "reactor" equipment to generate a lot of heat energy, and then the heat energy is taken out by water under high pressure. , steam is generated in the steam generator, and the steam drives the steam turbine to rotate with the generator, and electricity is continuously generated. The biggest feature of AP1000 is its concise design, easy operation, and full use of many "passive safety systems". , to further improve the safety of nuclear power plants, but also significantly reduce the cost of nuclear power unit construction and long-term operation. [0003] In the past, there were many concrete admixtures suitable for nuclear power plant...

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Problems solved by technology

[0003] In the past, there were many concrete admixtures suitable for nuclear power plants in China, but there was no polycarboxylic acid admixture suitable for AP1000 concrete used in third-generation nuclear power units. Because the third-generation nuclear power AP1000 was first applied in China, the project proposed higher requirements for concrete. Requirements, concrete admixtures play a key role in the various properties and durability of concrete. China has not yet used admixtures in this field, so it is urgent to develop polycarboxylate admixtures for AP1000 nuclear power unit concrete

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