Low viscosity large flowing degree C60 super high-rise pump concrete based on ultrafine sand compounding

Abstract

The invention discloses a low viscosity large flowing degree C60 super high-rise pump concrete based on ultrafine sand compounding. The super high-rise pump concrete comprises cement, mineral powder, fly ash, ultrafine natural sand, machine-made sand, broken stone, additives, and water. The super high-rise pump concrete can be prepared by a conventional method. The concrete is characterized in that according to the characteristics of premixed concrete in Sichuan and Chongqing areas, ultrafine natural sand and machine-made sand are compounded to obtain second grade medium sand; pebble and broken pebble are compounded according to a certain ratio to 5-25 continuous grading; 28d compressive strength can reach 70 MPa or more; the slump is not less than 240 mm, the slump flow is not less than 620 mm; the slump cone time is not more than 9 seconds, and the concrete has the characteristics of high strength, low viscosity, large flowing degree, easy operation of production mode, and suitability for the pumping of a super high-rise building with a vertical height more than 350 meters.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a low-viscosity and high-fluidity C60 super high-rise pumping concrete based on ultra-fine sand compounding. Background technique [0002] Super high-rise pumping concrete mix design technology refers to the modern concrete pumping technology with a pumping height exceeding 100m. With the expansion of the urbanization process, there are more and more super high-rise buildings, and the design technology of super high-rise pumped concrete mix ratio has become an indispensable key to the construction technology of super high-rise buildings. For concrete, pumping high-strength concrete has high pressure and high viscosity, making pumping construction particularly difficult, resulting in a series of construction technical problems that need to be solved urgently. Therefore, the study of super high-rise pumping technology of high-strength concrete has particularly important...

AI Technical Summary

Problems solved by technology

[0012] Therefore, in view of the poor material and appearance of the existing materials in the Sichuan-Chongqing area, as well as the existing machine-made sand resources and technical problems, provide ultra-high-rise (vertical height above 350m) pumped concrete prepared by combining ultra-fine natural sand and ultra-fine natural sand , the 28-day compressive strength of the concrete reaches more than 70MPa, the slump is ≥240mm, the expansion is ≥600mm, and the collapse time is ≤10s, fully meeting the super high-rise pumping requirements

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