Anti-bending and durable cement-based composites containing pp fibers

Abstract

The invention provides a fold-resistant and durable cement-based composite material containing PP fibers, which relates to the field of building materials and is composed of the following components in parts by weight: 30-50 parts of cement, 30-50 parts of aggregates, and 10-15 parts of PP fibers. parts, 5-10 parts of sisal fiber, 10-20 parts of mineral admixtures, 5-10 parts of modified waste tire rubber powder, 1-2 parts of sodium lignosulfonate, 2-5 parts of hydroxyethyl cellulose, 0.1-1 part of tetraethylene pentamine, 1-3 parts of melamine water reducing agent, 2-4 parts of water-based epoxy resin surface modifier, 10-15 parts of tertiary ethylene carbonate copolymer emulsion, 20-30 parts of water, The cement-based composite material of the invention has excellent mechanical strength, wherein the 28d compressive strength is greater than or equal to 90 MPa, and the 28d split tensile strength is greater than or equal to 6 MPa, which is far superior to the commercially available cement-based composite material.

Description

technical field [0001] The invention relates to the field of building materials, and specifically relates to a bending-resistant and durable cement-based composite material containing PP fibers. Background technique [0002] Due to the high brittleness of traditional cement-based building materials such as concrete, the application in many special engineering structures or special components of structures has been limited. In order to overcome the unique brittleness of traditional cement-based materials, a special high-performance fiber-reinforced cement-based composite material has been gradually developed in recent years, which is called engineering cement-based composite material abroad. Compared with traditional cement-based materials, this cement-based composite material has an important characteristic; that is, when the material cracks, its tensile bearing capacity can continue to increase, so that the material can undergo strain hardening with multi-slit cracking. Th...

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Problems solved by technology

At the same time, a large amount of fly ash is added as a raw material, which consumes the existing industrial waste that is not conducive to environmental protection, reduces the amount of cement used, and is conducive to reducing carbon emissions, making the high-ductility cement-based composite material greener, but the surface of PVA fiber is smooth There is no attachment site, and the bonding force with cement, fly ash, and sand is weak after being added. The long-term use tolerance is poor, and it is easy to slip under the action of external force, resulting in the overall disintegration of cement-based composite materials. The practical application prospect is worrying.

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