Admixture for pump-transporting and lifting poured concrete in arch rib steel pipe

Abstract

The invention discloses an admixture for pump-transporting and lifting poured concrete in an arch rib steel pipe. The admixture is prepared from the following components in parts by weight: 30-50 parts of potassium sulphoaluminate, 10-30 parts of light calcined magnesia clinker, 10-30 parts of anhydrite, 10-30 parts of bentonite, 1-3 parts of alkylamine, 0.1-1 part of chitosan, 0.2-2 parts of a plastic gas former, 0.2-2 parts of fructo-oligosaccharide and 0.5-2 parts of silica. Compactness and strength of the concrete in the arch rib steel pipe during pouring by pump-transporting and lifting can be improved, the connection closeness between the steel pipe wall and concrete is improved, and cracking of the steel pipe wall and displacement of the steel pipe arch axis are avoided.

Description

technical field [0001] The invention relates to the field of concrete, in particular to an admixture for pouring concrete in arch-rib steel pipes by a pumping jacking method. Background technique [0002] As a landscape bridge, the steel pipe arch bridge can be seen everywhere in the new construction, reconstruction and expansion of the city, and has good ornamental value. It has played a certain role in promoting the modernization, informatization and high development of the city. The pouring of steel pipe arch concrete is one of the keys to the success of steel pipe arch bridge construction; from the known construction situation of steel pipe arch bridges at home and abroad, it is known that the concrete density and strength of steel pipe arch concrete exist in varying degrees during the pouring process. Quality problems such as meeting the requirements, poor bonding of the steel pipe wall and concrete, cracking of the steel pipe wall, and excessive displacement of the st...

AI Technical Summary

Problems solved by technology

The pouring of steel pipe arch concrete is one of the keys to the success of steel pipe arch bridge construction; from the known construction situation of steel pipe arch bridges at home and abroad, it is known that the concrete density and strength of steel pipe arch concrete exist in varying degrees during the pouring process. Quality problems such as failure to meet the requirements, poor bonding between the steel pipe wall and concrete, cracking of the steel pipe wall, and displacement of the steel pipe arch axis exceed the specified standards. The light ones will shorten the service life of the steel pipe arch bridge, and the severe ones will cause heavy losses to life and property.