Super-retarded concrete for pile foundation and preparation method of super-retarded concrete

Abstract

The invention relates to the technical field of concrete processing, and particularly discloses super-retarded concrete for a pile foundation and a preparation method of the super-retarded concrete. The super-retarded concrete is prepared from the following raw materials in parts by weight: 240 to 250 parts of water, 250 to 270 parts of cement, 1350 to 1540 parts of sand, 1940 to 2150 parts of stone, 30 to 35 parts of fly ash, 70 to 90 parts of slag powder, 9 to 10.5 parts of polycarboxylic acid water reducing agent, 3 to 4 parts of a thickening agent and 5.5 to 7.5 parts of a retarder. The retarder is prepared from the following raw materials in parts by weight: 18-22 parts of sodium tripolyphosphate, 20-30 parts of white granulated sugar and 4-6 parts of sodium hydroxide modified N,N-bis(phosphonomethyl)glycine. Through the synergistic effect of the raw materials, the super-retarded concrete has the advantages of long setting time, high compressive strength and high breaking strength, the practicability of the super-retarded concrete is improved, the application range of the super-retarded concrete is widened, and market requirements are met.

Description

technical field [0001] The application relates to the technical field of concrete processing, more specifically, it relates to an ultra-retarded concrete for pile foundations and a preparation method thereof. Background technique [0002] With the development of society, the transportation hub industry is also making continuous progress. In the construction of transportation hubs, the method of vertically inserting HPE steel pipe columns is generally used for pile foundation construction. First, ultra-retarded concrete is poured at the pile foundation, and then the steel pipe column is inserted into the super-retarded concrete to a specified depth, and the ultra-retarded concrete The concrete is cured to complete the construction of the pile foundation. [0003] For ultra-retarded concrete, it is often adjusted by adding a retarder to achieve the purpose of increasing the retarding time of super-retarded concrete. Common retarders mainly include inorganic retarders and org...

AI Technical Summary

Problems solved by technology

However, the applicant found in practical applications that in the construction of pile foundations, it is necessary to go through the steps of super-retarded concrete transportation, pouring, HPE insertion machine in place, and insertion of steel pipe columns. When traffic jams are encountered during concrete transportation, the construction time of super-retarded concrete is increased, that is, when the initial setting time of super-retarded concrete for pouring a pile foundation is greater than 25 hours, it cannot meet the demand. Therefore, the initial setting of super-retarded concrete The time still needs to be improved, and the practicality and application range of ultra-retarded concrete should be improved