A kind of super high-rise jacking self-compacting concrete and its construction technology

Abstract

The present application relates to the field of building materials, and specifically discloses a super high-rise self-compacting concrete and a construction process thereof. The super high-rise jacking self-compacting concrete includes the following components in parts by weight: 395-434 parts of cement, 46-68 parts of fly ash, 65-98 parts of slag powder, 9.7-15 parts of silica fume, 12.1-17.6 parts of admixture, 165-188 parts of water, 0-324 parts of river sand, 570-842 parts of machine-made sand, and 821-861 parts of stones; the content of stone powder in the machine-made sand is ≤12%; the construction process is: S1, preparing concrete, S2, Concrete transportation and pumping, S3, curing. The super high-rise jacking self-compacting concrete of the present application has the advantages of good workability, good homogeneity, little loss over 3 hours, high crack resistance, high impermeability and strong carbonization resistance.

Description

technical field [0001] The present application relates to the field of building materials, and more particularly, to a super high-rise self-compacting concrete and its construction technology. Background technique [0002] With the deepening of theoretical research in building science and the emergence of new construction techniques, there are more and more high-rise and super-high-rise buildings. Due to its small size and other characteristics, the vibrating rod cannot fully vibrate through the narrow gap, so the concrete needs not only to meet the ultra-high pumpability, but also to meet the self-compacting property. [0003] There are usually two construction techniques for super high-rise concrete, one is high-throw construction, and the other is jacking construction. Considering the construction progress, operational safety and the self-compacting of the concrete in the steel pipe, the jacking construction has great advantages. Promote the application. The jacking pum...

AI Technical Summary

Problems solved by technology

However, the surface of the machine-made sand is rough, sharp, and angular, and there are many microcracks inside the machine-made sand particles, and the specific surface area is large, which easily makes the concrete poor in fluidity, high in viscosity, and high in pumping resistance.

[0005] In view of the related technologies mentioned above, the inventor believes that the use of machine-made sand in super high-rise jacking self-compacting concrete will easily lead to high viscosity, poor fluidity and high pumping resistance

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