NiTi alloy fiber concrete and preparation method thereof

Abstract

The invention discloses NiTi alloy fiber concrete and a preparation method thereof. The concrete comprises the following raw materials in percentage by mass: 10-15% of cement, 2-3% of fly ash, 2-2.5% of slag, 1.5-2% of silica fume, 25-30% of sand, 40-45% of gravel, 0.5-3% of NiTi alloy fiber, 5-10% of water and 0.5-1% of a water reducing agent, and the sum of the mass percentages of all the raw materials is 100%. The composite NiTi-based alloy toughened cement-based composite material has the characteristics of high strength, high toughness, high durability and the like; the anti-seismic ductility of the structure is improved, the resistance of the structure to severe environments is enhanced, generation of concrete cracks is slowed down, and the service life of the structure is prolonged. According to the invention, the unique shape memory effect and the phase change superelastic NiTi alloy fiber are adopted, the related cost of maintenance and the like of the structure in the use process is reduced, the characteristic enables the structure to still play a predetermined role well under the condition of atrocious weather environment for a long time, and even if the structure of the test piece is damaged, the test piece can still work normally. And the fibers can still bear stress, so that stress holding is realized.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a NiTi alloy fiber concrete and a preparation method thereof. Background technique [0002] As the most widely used building material in the world, cement-based materials are widely used in the field of civil engineering. However, as a brittle porous material, ordinary cement-based materials usually have defects such as low flexural strength and brittle failure. These defects are serious It restricts the long-term safe use of concrete structures. Fiber-reinforced concrete can control the cracks of concrete through fibers, increase the tensile strength of concrete, and improve the comprehensiveness of concrete. At present, the commonly used fiber reinforced material is steel fiber. Although steel fiber can improve the compressive strength of concrete, its enhancement of tensile strength is not obvious, which makes concrete prone to cracking. NiTi alloy fiber is a ne...

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is a kind of NiTi alloy fiber concrete and its preparation method, mix NiTi alloy fiber in concrete, increase concrete structure safety, durability, safe service life etc., solve the flexural strength existing in cement-based materials And the technical defects of low fatigue resistance and brittle fracture

Images