Vibration-free concrete for thin-walled prefabricated components and pouring method thereof

Abstract

The invention belongs to the technical field of building materials and discloses vibration-free concrete for a thin-wall prefabricated part and a pouring method of the vibration-free concrete. The vibration-free concrete contains the following components in parts by weight: gelatinization components: 14-20 parts of cement, 1.5-4.0 parts of blast furnace slag powder and 1.0-2.5 parts of steel slag powder; aggregate components: 25-33 parts of sand and 37-44 parts of pebbles; 0.30-0.45 part of a water reducing component; a swelling component: 0.8-1.5 parts of a compound swelling agent; fiber components: 1.0-2.0 parts of steel fibers and 0.01-0.04 part of synthetic fibers; a thickening component: 0.004-0.006 part of cellulose ether; a permeation component: 0.1-0.2 part of a cement-based permeable crystallization type water-proofing agent; and 5.6-6.3 parts of water. According to the vibration-free concrete, the noise produced during the formation of a concrete prefabricated part is greatly reduced, cavities and crevices are reduced, the crack resistance, volume stability and surface wear resistance of thin-wall structural concrete are remarkably improved, air hole, pitted surfaces and honeycombs in the surface of the concrete prefabricated part are effectively improved, the homogeneity of the thin-wall prefabricated part is remarkably improved, and the service life of the thin-wall prefabricated part is remarkably prolonged.

Description

technical field [0001] The invention relates to a vibration-free high-performance concrete for thin-walled prefabricated components and a pouring method thereof, belonging to the field of building materials and products thereof. Background technique [0002] With the vigorous promotion of construction industrialization and component standardization, large-scale thin-walled prefabricated components such as building wall panels, multi-storey pipe galleries and prestressed steel cylinder concrete pipes have been increasingly produced and applied. Such products usually have wall The thickness (rib thickness) is small, the length is large, the internal reinforcement is dense, the structural shape is changeable, or the external area is large. As a structural material for prefabricated components, concrete should not only have an appropriate strength level, but also have good constructability, crack resistance and impermeability to improve the overall durability and safety of the s...

AI Technical Summary

Problems solved by technology

This production method is very prone to the following problems: ① During vertical pouring, sometimes the height can reach 5-6m, while the concrete wall thickness is only 0.1-0.3m. Ordinary plastic concrete is prone to segregation during high-throw pouring. Reduce the apparent quality and internal homogeneity of concrete; ② It is difficult to control the vibration time during construction, and it is easy to over-vibrate, resulting in bleeding, which affects the surface hardness and durability of concrete; ③ Serious noise pollution, which is not friendly to the environment and affects employees physical and mental health; ④The vibration generated by vibration will cause great loss to the formwork and auxiliary facilities, which are prone to deformation, looseness and displacement, and need to be replaced regularly, increasing production costs; ⑤The production cycle of the vibration method is relatively long, and the degree of automation and Low efficiency, human factors have a greater impact on product quality, and the defective rate is high

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