A kind of ultra-long underwater pile foundation self-compacting concrete and preparation method thereof

Abstract

The invention discloses an ultra-long underwater pile foundation self-compacting concrete and a preparation method thereof. The mass ratio of each component of the concrete is: cement 18.11-19.75, nano-scale spherical siliceous powder 0.82-1.65, micron-scale spherical siliceous powder Powder 2.26-3.29, high-activity siliceous calcium powder 0.82-2.06, polysaccharide composite flocculant 0.21-0.82, machine-made crushed stone 32.80-36.64, machine-made sand 28.79-33.19, ultra-retarding polycarboxylate admixture 0.49-0.62 , Water 8.23‑9.05, solves the problems of poor dispersion resistance, poor durability, insufficient setting time and plastic preservation time of ultra-long underwater pile foundation self-compacting concrete with flowing water. The initial setting time of concrete can be controlled to 45-150h, which ensures the ultra-long setting time of concrete. At the same time, the suspended turbidity content, PH value and durability in the non-dispersive performance indicators all meet the requirements of non-dispersed concrete, and it is suitable for the construction of ultra-long underwater pile foundation concrete with flowing water and more than 70 meters.

Description

technical field [0001] The invention relates to an ultra-long underwater pile foundation self-compacting concrete and a preparation method thereof, belonging to the field of building materials. Background technique [0002] The geology of Southwest my country is complex, and there are huge difficulties in the construction of key projects such as airports, expressways, and high-rise buildings. Especially in the construction of ultra-long underwater pile foundations (ultra-long underwater pile foundations refer to underwater pile foundations with a length of more than 70 meters), there are unstable layers, karst caves, and groundwater enrichment in the pile foundation construction area. In the case of flowing water, the concrete needs to have good workability, durability, underwater non-dispersibility, and long setting time and plastic retention time, while ensuring that the 28d strength of the concrete does not decrease. SUMMARY OF THE INVENTION [0003] The object of the ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to address the above problems, to provide a self-compacting concrete for ultra-long underwater pile foundations and a preparation method thereof, to solve the problem of poor dispersion resistance and durability of self-compacting concrete for ultra-long underwater pile foundations under the current situation of flowing water. Poor performance, insufficient setting time and insufficient plastic retention time

Images