PHC tubular pile non-autoclaved concrete active powder and preparation method thereof

Abstract

The invention discloses PHC tubular pile non-autoclaved concrete active powder. The PHC tubular pile non-autoclaved concrete active powder comprises, by mass, 35%-65% of granulated blast furnace slagpowder, 20%-45% of fly ash, 5%-15% of silica fume, 5%-35% of microbeads, 5%-20% of gypsum powder, 5%-25% of nickel slag powder and 0.01%-5% of an early strength agent. A preparation method of the active powder comprises the following steps: putting the granulated blast furnace slag powder, the fly ash and the nickel slag powder into a ball mill, grinding for 20-40 minutes until the specific surface area is 400-450 m<2>/kg, and mixing the obtained powder with the silica fume, the microbeads, the gypsum powder and the early strength agent in a mixer for 15-25 minutes. The PHC tubular pile non-autoclaved concrete active powder can ensure the early and later strength of concrete, shorten the steam curing time, improve the production efficiency, enhance the durability of the concrete, and obtain favorable social and economic effects.

Description

technical field [0001] The invention relates to PHC pipe pile autoclaved concrete active powder and a preparation method thereof, belonging to the field of pipe pile concrete. Background technique [0002] China's pipe piles have been developed for more than 30 years, and most of them use the autoclave process. The disadvantages are ① high energy consumption and high production costs; ② large environmental pollution; ③ concrete is prone to micro-cracks and other defects that reduce durability; ④ autoclave It is a major source of danger and is prone to production safety accidents. ⑤ Autoclaved PHC pipe piles (especially those mixed with silica sand powder) are highly brittle, which affects the driving resistance. [0003] On January 21, 2015, the domestic publication date, the Chinese invention patent application with the publication number CN104291757A introduced a preparation method for high-performance concrete admixture: it disclosed a non-autoclaved PHC pipe pile suit...

AI Technical Summary

Problems solved by technology

[0002] China's pipe piles have been developed for more than 30 years, and most of them use the autoclave process. The disadvantages are ① high energy consumption and high production costs; ② large environmental pollution; ③ concrete is prone to micro-cracks and other defects that reduce durability; ④ autoclave Is a major source of danger, prone to production safety accidents

⑤Autoclaved PHC pipe piles (especially mixed with silica sand powder) are highly brittle, which affects the resistance to driving

However, there are also the following defects: the amount of cementitious material is still high, the proportion of admixture is relatively large, and the water-cement ratio is too small, which makes the fluidity of concrete poor and sticky, which is not conducive to on-site construction operations

The defect of this invention is that high-calcium fly ash may contain free calcium oxide, resulting in poor concrete volume stability in the later stage, thereby affecting the durability of concrete

[0006] To sum up, the admixtures for PHC pipe pile concrete in the prior art partly solve the requirements of the construction industry for concrete performance, but its formula is still unreasonable, and it is necessary to use an atmospheric pressure steam curing time that is short, early and late High strength, high production efficiency, good durability PHC special active powder for autoclaved pipe pile concrete to meet the needs of the construction market

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