Immersed tube foundation post-filling concrete

Abstract

The present invention discloses a filling concrete, which comprises a concrete mixture, a concrete admixture and a cementing material, wherein the concrete mixture is inert powder, the concrete admixture comprises one or a plurality of materials selected from an anti-dispersing agent, a tackifier and a high-performance polycarboxylate water-reducing agent, the use amount of the cementing material is 270-400 kg/m<3>, the sand rate is 45-52%, and the water-cement ratio is 0.56-0.85. According to the present invention, the concrete has good flowing performance, can achieve the self-leveling effect under water, has good underwater non-dispersibility, and can effectively resist seawater erosion, wherein the zero bleeding rate of the concrete can ensure the immersed tube foundation post-filling fullness in a seawater environment.

Description

technical field [0001] The invention belongs to the field of civil engineering, and relates to a concrete formula and a preparation method, in particular to a low-strength, large-flowing and non-dispersible concrete formula, which can maintain good stability in water and is not dispersed by a flowing aqueous solution. . Background technique [0002] At present, the materials used for post-filling of immersed tube foundations, in order to ensure their good fluidity and ultra-low strength matching the foundations, mostly use cement mortar mixed with bentonite, and their 28-day compressive strength is 0.5~10Mpa. Ultra-low-strength cement mortar has a high water-to-binder ratio and is prone to bleeding, which affects the fullness of the foundation filling of the immersed tube; the ability of the mortar to resist seawater erosion and its own volume deformation is inferior to that of concrete; the current technology rarely considers the filling slurry underwater loss. [0003] O...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problems and deficiencies in the prior art that the immersed tube foundation is filled with low-strength mortar and the anti-scouring performance is difficult to achieve a comprehensive balanced optimization, especially it is difficult to prepare ultra-low-strength filled concrete to match the foundation , to provide a filling concrete, especially a kind of ultra-low-strength high-flowing non-dispersible concrete, to effectively improve the fullness and durability of the foundation filling of the immersed tube, and overcome the inability to effectively achieve the sealing of the filling part during the filling process of the immersed tube Cons of performance and stability