Immersed tube joint grouting concrete and a preparing method thereof

Abstract

Immersed tube joint grouting concrete is disclosed. The concrete includes, by weight, 25-50% of a concrete admixture, 5-20% of inert powder, 1-2% of a water reducer, 0.2-0.5% of an anti-dispersion agent, 1-5% of a thickening agent, 5-8% of an expanding agent, other binding materials and water, wherein the total using amount of the binding materials is 450-500 kg / m<3>, and the water-binder ratio is 0.34-0.45. According to some properties of the concrete, the degree of slump extension is 600-700 mm, the concrete is non-dispersible under water, the cement loss amount is less than 3.0%, the content of suspended compounds is less than 150 mg / L, and the bleeding rate is 0. The concrete admixture is one or more of coal ash and pelletized blast furnace slag. The inert powder is one or more of limestone powder, gangue, zeolite powder and fine quartz powder. The concrete has a characteristic of resisting sea water brushing in a marine environment, can fully fill component pores, can avoid holes, and has outstanding performance in the field of preventing sea water erosion, and the like.

Description

technical field [0001] The invention belongs to the field of civil engineering construction, and relates to a marine engineering underwater pipe joint girder grouting material, in particular to a marine concrete mixture, which is suitable for grouting in narrow and closed spaces in seawater environments. The concrete has the characteristics of high flow, low dispersion, corrosion resistance, and micro-expansion, and has good feedback in construction and application in seawater environments. Background technique [0002] At present, the underwater joints of immersed tubes in China are mostly in fresh water environment, and the grouting materials are mostly mortar or ordinary concrete. In the marine environment, the grouting material has poor underwater cohesion, is prone to voids and pores, faces seawater corrosion, has insufficient protection for the structure, and cannot meet the requirements of grouting in narrow and closed spaces in the seawater environment. [0003] The...

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the disadvantages of ordinary concrete mortar in the prior art that it is difficult to meet the requirements of application in the complex environment of marine water bodies, the existing cohesion is poor, and it is easily corroded by seawater, and to provide an immersed pipe joint trabecular injector used in seawater environment. Slurry concrete mixture to meet the requirements of fullness, non-dispersion, corrosion resistance, penetration resistance and micro-expansion of submerged pipe joints in deep sea environment