Functionally graded cement-based composite material with fiber orientation and preparation method thereof

Abstract

The invention discloses a functionally graded cement-based composite material with directional arrangement of fibers and a preparation method thereof. The composite material adopts a three-layer gradient structure, the lower layer is composed of high-strength mortar and end-hook steel fibers arranged in a directional grid, the middle layer is composed of fiber-reinforced mortar and high-strength coarse aggregate, and the upper layer is composed of high-strength mortar and oriented mesh The end-hook steel fibers arranged in a lattice form are composed, and the directional end-hook steel fibers are soaked in the concrete functional repair solution. The invention adopts end-hook fibers for directional arrangement and reinforcement, and at the same time, end-hooks play an anchoring role in concrete to prevent fibers from being pulled out under force. The functional gradient structure of the present invention effectively improves the performance of the cement-based composite material. The grid fiber layer enhances the flexural strength, toughness and ductility of the concrete, and at the same time restricts and fixes the high-strength aggregate to avoid its shock falling off. The high-strength aggregate layer can improve the material's resistance pressure and penetration resistance.

Description

technical field [0001] The invention relates to a functionally graded cement-based composite material and a preparation method thereof, in particular to a functionally graded cement-based composite material with directional fibers and a preparation method thereof, belonging to the technical field of concrete. Background technique [0002] Cement-based materials have the characteristics of strong applicability and low price, and are widely used in the field of construction. However, the obvious brittle characteristics of cement substrates, poor tensile properties, crack resistance and other defects often lead to reduced performance of components and structures, which seriously restricts the use of cement-based materials and the development of building structures. Adding fibers to cement-based substrates can improve performance defects such as low tensile strength, poor toughness, and easy cracking of ordinary cement-based materials. The way of fiber addition is mixing two or...

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Problems solved by technology

Although this kind of concrete can prevent its overall cracking, the amount of steel fiber required to achieve this effect is very large

At the same time, in order to reduce the penetration depth of concrete, high-strength aggregates need to be added, but the mixing method of fibers cannot reduce the occurrence of high-strength aggregates detaching from the concrete matrix due to the impact and vibration of projectiles, and cannot resist penetration explosions. Coupling (Jun Feng, WeiweiSun, Zhilin Liu, et al.Anarmour-piercing projectile penetration in a double-layered target of ultra-high-performance fiber reinforced concrete and armor steel: Experimental and numerical analyzes[J].Materials&Design.2016,04 (21):131-141.)

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