Highly durable permanent column template

Abstract

The invention discloses a highly durable permanent column template. The column template comprises a column template body and is characterized in that the column template body is a thin-walled cylinder; grooves are formed in the surface on the inner side of the thin-walled cylinder; and reinforcement bars are embedded in the two ends of the thin-walled cylinder. The shape of the cross section of the column template body is the same with that of a column to be poured and is circular, rectangular or polygonal; the cross section size and the height of the column template body are the same with those of the column to be poured; and the thickness of the column template body is that of the protective layer of the column to be poured. The grooves are circularly formed in the surface on the inner side of the thin-walled cylinder of the column template body. The reinforcement bars are embedded in the thin-walled cylinder for 15 cm to 20 cm and extend out of the two ends of the thin-walled cylinder for 15 cm to 20 cm. The column template body is prefabricated with ECC (Engineered Cementitious Composites). The highly durable permanent column template has the advantages of high tensile ductility and excellent creak control capability, is superior to common concrete in chloride ion penetration resistance and water penetration resistance, can improve the durability of concrete structures, facilitates the construction, and shortens the construction time.

Description

technical field [0001] The invention belongs to the technical field of building construction, and in particular relates to a high-durability permanent column formwork, specifically a high-durability permanent column formwork mainly used in hydraulic structures, harbor and sea structures, industrial and civil buildings, etc. It is used as a formwork in the pouring stage, and it also acts as a protective layer for columns and participates in structural work after pouring. Background technique [0002] ECC (engineered.cementitious.composites, fiber cement composites for engineering) is a new type of cement-based composite material that uses fly ash, cement and silica sand as fillers, and then adds synthetic fibers. A large number of studies on physical and mechanical properties have shown that ECC materials not only have ultra-high toughness, but also have strong energy absorption capacity. ECC material has strong corrosion resistance and permeability resistance, which can eff...

AI Technical Summary

Problems solved by technology

In the traditional structure, the ordinary concrete surface is naturally exposed, and the durability is low

In addition, designing with crack resistance as the control condition is an important feature that distinguishes hydraulic structures and harbor and sea structures from other types of building structures. The problem of easy cracking of ordinary concrete will not only affect the normal work of hydraulic structures but also affect their durability and use Life expectancy, serious and even affect the safe operation of the structure

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