ECC non-dismantling formwork, concrete beam based on formwork and construction method thereof

Abstract

The invention discloses an ECC non-dismantling formwork, a concrete beam based on the formwork and a construction method thereof, and belongs to the technical field of building material construction.The ECC non-dismantling formwork comprises a formwork body, the formwork body is made of cement-based composite materials, the outer side surface of the formwork body is a smooth surface, the inner side surface of the formwork body is a smooth surface, a roughened surface, a concave and convex surface or a sand blasting surface rough surface, an enhancement layer is arranged in the formwork body,and the enhancement layer is a steel strand mesh, a fiber mesh, an FRP mesh, an FRP bar or steel bar. The ECC non-dismantling formwork is not dismantled after the formwork concrete is poured, but is used as a part of a concrete structure, load is borne, some special functions, such as heat preservation, heat insulation and increasing the durability of the concrete structure are further achieved, and when the formwork is used for beam fabrication, the advantages that the construction procedures are simplified, operation is simple and convenient, labor conditions are improved, the amount of formwork support and dismantling is saved, and the construction progress is accelerated are achieved.

Description

technical field [0001] The invention belongs to the technical field of building material construction, and in particular relates to an ECC demolition-free formwork, a concrete beam based on the formwork and a construction method thereof. Background technique [0002] In the current field of civil engineering, most of the pouring forms for concrete structures are wooden formwork, and the turnover rate of wooden formwork is extremely low, resulting in serious waste, which will aggravate the negative impacts such as environmental pollution and social and economic losses; The popularization and application of aluminum and steel molds at this stage has effectively alleviated the waste of timber resources and the state of tight supply. However, the cost of aluminum molds and steel molds is relatively high, and losses will also occur during the turnover process. On the other hand, these two kinds of formworks all need to be demolished, the process is relatively complicated, and th...

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Problems solved by technology

[0004] (1) The development of reinforced concrete non-demolition formwork is relatively mature and relatively economical, but this kind of beam formwork is heavy and inconvenient to transport and install. Installing the stress bars in the prefabricated formwork will easily lead to insufficient integrity of the laminated components;

[0005] (2) The profiled steel formwork is light in weight, fast in installation and good in construction quality, but its fire resistance is weak, its cost is high, and its integrity is difficult to guarantee;

[0006] (3) Fiber-based non-demolition formwork is the current development direction of non-demolition formwork. The fiber in the formwork is used to replace traditional reinforcement to enhance the mechanical properties of beam formwork. However, the research on fiber-type non-demolition formwork started late, and the development is not yet mature;

[0007] (4) Insufficient technical innovation of the dismantling-free formwork. The dismantling-free formwork should not only provide additional functions for the structure, but also provide strength for the structure, ensure ductility, and protect internal steel bars, etc.

[0009] ECC demolition-free formwork is a CFRP mesh-reinforced ECC formed by combining CFRP mesh and ECC. This structural form can significantly improve the toughness of the material, improve the crack control ability of the material, make the cracks develop more closely, and realize concrete cracks. Harmless dispersion, while obtaining higher bearing capacity, solves the problems of poor fire resistance, poor steam permeability and easy peeling of traditional FRP sheet reinforcement methods, and the shortcomings of traditional cement-based materials such as easy cracking and poor ductility

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