Ultra-high toughness cement-based composite material extrusion directional mixer and extrusion method

Abstract

The invention discloses an ultra-high toughness cement-based composite material extrusion directional mixer and an extrusion method. The mixer is composed of a first propulsion part and a second propulsion part; the first propulsion part includes a first motor, a first outlet The material cylinder and the vacuum chamber, the first discharge cylinder and the vacuum chamber are connected in sequence, the first motor is connected to the first transmission shaft, the first transmission shaft runs through the mixing chamber, the first discharge cylinder and the vacuum chamber in sequence, and is located in the first discharge cylinder The part is provided with a first helical blade; the second propulsion part includes a second motor and a second discharge cylinder, the second motor is connected to the second rotating shaft, and the second rotating shaft passes through the second discharge cylinder and points to the second discharge cylinder The material outlet, the inner wall of the second discharge cylinder is a necking structure along the material flow direction, the second rotating shaft is provided with a second helical blade, and the second discharge cylinder communicates with the vacuum chamber. The invention can realize the directional distribution of fibers, increase the number of effective fibers that play a bridging role, and obtain higher toughness of the matrix.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and relates to an extrusion-oriented mixer and an extrusion method for ultra-high toughness cement-based composite materials. Background technique [0002] The statements herein merely provide background information related to the present invention and may not necessarily constitute prior art. [0003] At present, the concrete structure is developing rapidly towards the trend of higher space, larger span and heavier load. This requires concrete materials to have more excellent properties to meet these requirements. With the continuous deepening of research, the performance of concrete structures has been greatly improved, but there are still many deficiencies when applied to infrastructure construction. It directly affects engineering safety, economy and durability, and it mainly has the following three problems: [0004] (1) Brittle failure caused by extreme load. [0005] (2) Dest...

AI Technical Summary

Problems solved by technology

[0004] (1) Brittle failure caused by extreme load

[0005] (2) Destruction under normal working load

[0006] (3) Sustainability of reinforced concrete structures

At present, the excellent performance of ECC is not stable, which is related to the distribution and orientation of fibers in cement-based materials and the molding process. Since ECC uses short-length and thin-diameter fibers as reinforcing fibers, the short fibers are in the cement after uniform mixing. There is a random distribution in the matrix material, which leads to different angular positions between the fibers and the cracks when the matrix is ​​cracked, especially the position parallel to the cracks (the fiber direction is perpendicular to the direction of the force), and the fibers can hardly play a bridging role.

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