Post stressed concrete beam pipe mudjacking agent

Abstract

The invention provides a post stressed concrete beam pipe mudjacking agent which is characterized by comprising the following components in percent by weight: 1-3 percent of efficient slushing component, 5-10 percent of early-expanded component, 30-50 percent of middle-late expanded component and 40-60 percent of mineral admixture. The invention also provides a preparation method of the post stressed concrete beam pipe mudjacking agent, which comprises the step of uniformly stirring the components in a stirrer according to the weight percent to obtain the post stressed concrete beam pipe mudjacking agent. The post stressed concrete beam pipe mudjacking agent, cement and water are mixed according to a certain proportion to prepare a mudjacking material to be used for construction. The mudjacking agent has optimal flowing property, excellent water holding property, better compactness, full and uniform structure and good early plastic expanded performance, does not contain additives with corrosion on prestressed reinforcing steel, and has very low chloridion content, better adaptability with various cements and lower sensitivity on temperature and humidity.

Description

Technical field: [0001] The invention belongs to an admixture for channel grouting of railway post-tensioned prestressed concrete beams (including simply supported beams and continuous beams), in particular to a high-performance railway post-tensioned prestressed concrete beam pipe grouting agent. The grouting agent can also be applied to the grouting construction of prestressed reinforced concrete channels in large-scale projects such as bridges and nuclear power plants. Background technique: [0002] Prestressed concrete technology is one of the 10 new technologies promoted and applied during the "Ninth Five-Year Plan" and "Tenth Five-Year Plan" by the Ministry of Construction. It is widely used in buildings, bridges and special engineering structures, and is an indispensable and important component of construction technology. part. [0003] In the post-tensioned prestressed concrete structure, the prestressed steel and concrete in the bonded prestressed concrete have a ...

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Problems solved by technology

[0010] Chinese patent CN 1559960A discloses a high-performance grouting admixture for post-tensioned prestressed concrete, in which the early shrinkage of the cement paste is compensated by adding aluminum powder, but in actual construction, the amount of gas produced by the aluminum powder is affected by the environment. The temperature has a great influence. In addition, the generated hydrogen is likely to cause "hydrogen embrittlement" of prestressed steel bars, and the current relevant specifications have clearly stipulated that it is strictly forbidden to mix aluminum powder in grouting materials.

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