GO (graphene oxide) and nano mineral powder synergistically dispersed CNT (carbon nanotube) modified nano building material as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of nanomaterials and particularly relates to a GO (graphene oxide) and nano mineral powder synergistically dispersed CNT (carbon nanotube) modified nano building material as well as a preparation method and an application thereof. The GO and nano mineral powder synergistically dispersed CNT modified nano building material comprises CNT powder or a CNT dispersion liquid, GO powder or a GO dispersion liquid, nano mineral powder, a superplasticizer, water, cement and a defoamer. The prepared nano building material can realize the effect of synergistic dispersion of CNTs by GO and the nano mineral powder and solves the problem that GO is prone to deoxidation and agglomeration in an alkaline system. A prepared piezoresistive sensor based on the nano building material has good piezoresistance sensing performance, is excellent in mechanical toughness and high in compatibility with a concrete matrix, and has good application prospect in the fields of frame-shear coupling beams of high-rise buildings, energy-consuming nodes, high-strength / high-toughness joint seams between traffic bridges and pavement structures as well as large engineering health monitoring sensors.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, in particular to GO and nanometer mineral powder synergistically dispersed CNT modified nanometer building material and its preparation method and application. Background technique [0002] Cement-based composite materials have become the most widely used building materials in infrastructure construction due to their advantages such as convenient material acquisition, good plasticity of slurry, high compressive resistance of hardened body, and good durability. However, it has disadvantages such as low tensile strength and poor fracture toughness, which easily make the corresponding structural system based on cement-based composite materials fail. Solving these problems has very important application and economic value, and will further expand its application range. In the last century, people mainly improved the tensile strength and fracture toughness of cement-based materials by com...

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Problems solved by technology

Chinese patents ZL200810064075.0, ZL200810064522.2, and ZL200810064501.0 respectively attempt to use surfactants to disperse CNTs in cement-based materials through ultrasonic, high-speed shear, and electric field induction processes; however, surfactants often have a lot of air bubbles, which may Affect the hydration of cement, and at the same time make the bonding interface between CNT and cement weak; on the one hand, the high-speed shearing method may shear the CNT, on the other hand, the sample processing amount is relatively small; on the one hand, the electric field induction method consumes a large amount of organic solvent, on the other hand Corresponding CNT deposition layer and cement base layer bonding surface is weak

International patent ZL200980125145.1 uses cement clinker as the substrate for anchoring transition metal nanoparticles, allowing continuous and large-scale synthetic growth of CNTs on cement clinker and grains, and then forming subsequent CNT / cement clinker composites and structural products; However, this method is still difficult to achieve sufficient dispersion of CNTs at the nanoscale due to the micron-scale cement clinker

Chinese patent CN106277876A discloses a polypyrrole conductive polymer with good conductivity and hydrophilic properties loaded on the surface of CNT by in-situ polymerization method, and it is added to the cement matrix as a conductive filler to make a polypyrrole with good conductivity. Cement-based conductive composites with self-sensing properties and mechanical properties; however, polypyrrole will degrade in alkaline cement-based hydration systems, and it is difficult to maintain its dispersion continuously

These problems will greatly limit its wide application in cement concrete materials with large quantities and wide areas.

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