Preparation method of high-dropping vibration-free concrete for ultra-deep foundation

Abstract

The invention relates to the technical field of building materials, and particularly discloses a preparation method of high-dropping vibration-free concrete for an ultra-deep foundation. The method comprises the following steps: S1, selecting raw materials; S2, determining a mixing ratio of the raw materials: 220-240 parts of cement, 210-220 parts of natural sand, 400-600 parts of machine-made sand, 1000-1100 parts of stones, 100-200 parts of fly ash, 80-100 parts of mineral powder, 8-10 parts of an emulsified composite sulfate-resistant corrosion and rust inhibitor, 11-14 parts of an emulsified dense feeding agent and 0.5-2 part of a water reducing agent, wherein a water-binder ratio is 0.34-0.40; and S3, mixing the raw materials, sequentially adding cementing materials including stones,sand, cement, mineral powder and furnace slag, water and other additives into a stirrer, and performing uniform stirring. The invention aims to improve the construction quality of the high-dropping vibration-free concrete.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method for preparing high throw vibration-free concrete used for ultra-deep foundations. Background technique [0002] With the rapid development of modern cities, super high-rise buildings have been widely used in the process of urban development, and super high-rise buildings have become a symbol of a city's economic strength. The quality assurance of super high-rise buildings comes from the foundation, which makes large-volume rafts The foundation has become an indispensable part. As the height of the floor increases, the size and thickness of the required raft will increase accordingly. The grade of the concrete, the number of layers of steel bars, and the specifications will also increase. [0003] At present, the market is widely circulated and the fluidity of ordinary concrete is low. Manual vibration is required to fill the inside of the formwork and steel ba...

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Problems solved by technology

[0003] At present, the market is widely circulated and the fluidity of ordinary concrete is low. Manual vibration is required to fill the inside of the formwork and steel bars. The foundation thickness of super high-rise raft slabs is generally super deep, with many layers of steel bars and large specifications. The pouring conditions on site are unfavorable. In some places, the length of the vibrating rod is not enough due to the deep depth of the steel bar, or due to the large number of steel bars, the number of roots and the number of layers, the steel bar is too dense to vibrate or it is difficult to vibrate. If manual vibration is used, the operator needs to There are serious safety hazards in the vibrating operation inside the foundation, and safety accidents are very prone to occur, and the quality of the concrete is not guaranteed

[0004] Because the depth of super high-rise foundations is generally super deep, ordinary concrete is used for pouring. Due to the influence of surface steel bars, it needs to be dropped from high altitude, and the concrete is easily segregated. Quality hidden dangers, unable to guarantee the construction quality of concrete

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