Hybrid fiber reinforced strain hardening cement-based composite material and preparation method thereof

Abstract

The invention discloses a hybrid fiber reinforced strain hardening cement-based composite material and a preparation method thereof, The raw material composition of the composite material is as follows: Portland cement, water reducer, fly ash, sand, PVA fiber, steel fiber, calcium carbonate whisker and water, the mass proportion of the above raw materials is as follows: Portland cement 300+-5 Kg / m3, water reducer 6+-1 Kg / m3, fly ash 1200+-50 Kg / m3, sand 540+-20 Kg / m3, PVA fiber 18+-4 Kg / m3, steel fiber 45+-25 Kg / m3, calcium carbonate whisker 110+-40 Kg / m3, water 510+-5 Kg / m3. The hybrid fiber reinforced strain hardening cement-based composite material of the present invention has excellent tensile deformation ability, extremely strong bending deformation ability, obvious multi-slot cracking characteristics under uniaxial tension and bending load, high level compressive energy absorption ability, high cost-performance ratio, low cost, easy availability of raw materials and simple preparation process.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a hybrid fiber-reinforced strain-hardening cement-based composite material and a preparation method thereof. Background technique [0002] Reinforced concrete beams, columns, and slabs in industrial and civil building structures, or primary support shotcrete in tunnel engineering, or in-service structures such as caps, pier columns, cap beams, and load-bearing beams in bridge engineering, should be designed, Due to construction, use and other reasons, it is normal to have insufficient strength, insufficient bearing capacity, cracking or even damage under overload. When these phenomena are not serious, structural reinforcement is generally used for reinforcement. The commonly used method is the bonding method. , sticking carbon fiber cloth method and increasing the section method. Structural reinforcement adopts the enlarged section method, generally reinforced concret...

AI Technical Summary

Problems solved by technology

Their common features are: relatively simple preparation, wide source of materials, only focus on compressive strength and ignore tensile, bending and deformation properties, organic polymer materials are easy to oxidize and become brittle and cracked, low cost performance, etc.

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