High-ductility fiber concrete and construction method for reinforcing beam by using high-ductility fiber concrete

Abstract

The invention discloses high-ductility fiber concrete and a construction method for reinforcing a beam by using the high-ductility fiber concrete. The concrete is prepared from cement, coal ash, limestone powder, water, common riversand, a water reducing agent and PVA fibers. The construction method comprises the following steps: chiseling away a bottom reinforcement protective cover of an original concrete beam to enable load-bearing rebars to be exposed, welding added load-bearing main rebars to original load-bearing main rebars through short rebars, and then pouring the high-ductility fiber concrete to the surface. The construction method aims to solve the problem that the existing reinforcement construction technological method is low in operability. By the use of the mechanical property of the high-ductility fiber concrete as well as high joint work performance and integrality of an added structure and an original structure which are reinforced, the bearing capacity of the original concrete beam can be substantially improved; the reinforcement process is simple, the construction is convenient and quick, and the added section is relatively small in size; the high-ductility fiber concrete is safe in structure and relatively high in applicability.

Description

technical field [0001] The invention belongs to a reinforcement construction method for concrete beams, in particular to a high ductility fiber concrete and a construction method for reinforcement beams. Background technique [0002] Reinforced concrete beams are one of the important components in industrial and civil buildings and are widely used. During the service and use of beam components, the load-bearing performance of reinforced concrete beams is degraded due to congenital deficiencies in construction, changes in service conditions, deterioration of concrete materials, corrosion of steel bars and other durability damage, and insufficient bearing capacity occurs. In order to ensure the safety and normal use of the structure, It needs to be reinforced. The traditional reinforcement method of increasing the cross-section of concrete beams is to use reinforced concrete of the same material to increase the load-bearing cross-sectional area of ​​the original concrete beam...

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Problems solved by technology

[0004] Aiming at the defects and deficiencies of existing concrete prefabricated floor slab reinforcement methods, the present invention is based on the design method of fiber material micro-mechanical properties, and considers the fiber characteristics, matrix characteristics, fiber-matrix interface characteristics and the interaction between them, through the material mix ratio The high ductility cement-based composite material obtained after design optimization, using the mechanical properties of high ductility fiber concrete, proposes a safe, efficient and good performance high ductility fiber concrete and its construction method for strengthening beams

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