Super-long underwater pile foundation machine-made sand self-compacting concrete and preparation method thereof

Abstract

The invention discloses super-long underwater pile foundation machine-made sand self-compacting concrete and a preparation method thereof. The mass ratio of the components of the concrete is as follows: 17.70-18.93 of cement, 0.82-2.06 of nano-scale spherical siliceous powder, 1.23-1.65 of micron-sized spherical siliceous powder, 0.82-2.06 of high-activity siliceous-calcareous powder, 9.90-11.25 of machine-made broken stone A, 23.09-26.26 of machine-made broken stone B, 32.44-36.36 of machine-made sand, 0.41-0.62 of admixture and 7.82-8.23 of water. High-quality raw materials are preferably selected in the invention, indexes such as cement fineness, setting time and standard consistency are controlled; the cement can meet the adjustable control requirement of the ultra-long underwater pilefoundation setting time from 30 hours to 150 hours under the action of the admixture, and the concrete is suitable for underwater pile foundation concrete construction without flowing water and withthe length of 70 m or above, especially for underwater pile foundation concrete construction with the length of 100 m.

Description

technical field [0001] The invention relates to an ultra-long underwater pile foundation machine-made sand self-compacting concrete and a preparation method thereof, belonging to the field of building materials. Background technique [0002] The geology in 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 piles over 70 meters long. pile foundation) during construction. Especially when there are unstable layers, karst caves, and groundwater enrichment in the pile foundation construction area, the pile foundation construction has the characteristics of slow speed and long construction time. This has extremely high requirements for concrete. On the one hand, it is necessary to solve the problem of super long setting time and plastic retention...

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Problems solved by technology

[0003] The purpose of the present invention is to address the above problems, to provide an ultra-long underwater pile foundation machine-made sand self-compacting concrete and its preparation method, in order to solve the problem that pile Foundation construction has the characteristics of slow speed, long construction time, etc., the problem of insufficient concrete setting time and poor plasticity, in order to solve the strength and durability of concrete in the case of ultra-long retarding time, the invention is suitable for no flowing water, Concrete construction of underwater pile foundations with a length of more than 70m, especially suitable for concrete construction of underwater pile foundations with a length of 100m

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