A kind of ultra-high-strength high-performance fiber concrete of C200 strength grade and preparation method thereof

A high-performance fiber, strength-grade technology, used in climate sustainability, sustainable waste treatment, solid waste management, etc., can solve problems such as unfavorable dispersion of graphene oxide, loss of concrete strength, and inability to stably disperse, and achieves suppression of plasticity. Shrinkage, improve crack resistance, promote the effect of hydration process

Active Publication Date: 2019-11-08
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Claims
  • Application Information

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Problems solved by technology

However, due to the sp2 hybrid structure in the graphene plane, there is a strong molecular attraction between the nanoparticles, which causes mutual adsorption, causing the graphene to agglomerate together, unable to stably disperse in the polymer and play its role, and even cause the occurrence of defect
The oxidized graphene monolithic surface introduces a lot of oxygen-containing functional groups such as hydroxyl and carboxyl, so that it can be uniformly dispersed in water, but graphene oxide is prone to flocculation under alkaline conditions, which is very difficult for graphene oxide in cement. Dispersion is unfavorable and may even cause loss of concrete strength

Method used

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  • A kind of ultra-high-strength high-performance fiber concrete of C200 strength grade and preparation method thereof

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preparation example Construction

[0051] The preparation method of the ultra-high-strength high-performance fiber concrete of the C200 intensity grade of the present invention comprises the following steps:

[0052] 1) 10.2 parts by mass of activator and 2.8 parts of defoamer are dissolved in 25% of the total water, which is recorded as aqueous solution 1, 15.6 parts of water reducer, 46 parts of hydroxyl modified carbon nanotube dispersion and 47 parts One part of graphene oxide dispersion liquid is added in the 50% aqueous solution of total water yield, is recorded as aqueous solution 2;

[0053] 2) Weigh 760 parts of river sand and quartz sand, 990 parts of gravel and 1.7 parts of cellulose fiber in a mass ratio of 8:2 and add them to the mixer in turn, and stir evenly for 2-3 minutes;

[0054] 3) Then, add 520 parts of cement, 65 parts of fly ash, 72 parts of rice husk ash, and 126 parts of silica fume in sequence, then add the aqueous solution 1 prepared in step 1) into the mixer, and stir evenly for 2-3 ...

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Abstract

The invention discloses an ultra-high strength high-performance fiber concrete with a strength grade of C200 and a preparation method thereof. The concrete comprises the following components in parts by mass: 520 parts of cement, 66 parts of water, 990 parts of gravel, 760 parts of fine aggregates, 65 parts of fly ash, 72 parts of rice husk ash, 126 parts of silica fume, 15.6 parts of a water reducer and 10.2 parts of an activator, 1.7 parts of cellulose fibers, 46 parts of a hydroxyl modified carbon nanotube dispersion liquid, 47 parts of a graphene oxide dispersion liquid and 2.8 parts of a defoaming agent. The prepared concrete has high toughness and excellent durability and has high bonding strength with section steel. The compressive strength reaches 207.87 MPa, the breaking strength reaches 37.69 MPa, the splitting tensile strength reaches 18.32 MPa, the bonding strength with section steel reaches 8.75 MPa, and the impermeability grade of chloride ions reaches a VI grade. The concrete provided by the invention is used in a section steel concrete composite structure, the cooperative working performance between the section steel and the concrete can be effectively exerted, and the defects that the bonding property between section steel and concrete is poor and respective mechanical properties of the steel sections and the concrete can not be fully exerted are made up.

Description

technical field [0001] The invention belongs to the field of new building materials, and is a high-strength, high-toughness and high-durability concrete mixed with rice husk ash, cellulose fibers, modified carbon nanotubes and graphene oxide, and specifically relates to a C200 concrete with high toughness Ultra-high-strength high-performance fiber concrete of strength grade and a preparation method thereof. Background technique [0002] Ordinary concrete and cement-based materials have low tensile strength and poor toughness, and a large number of microcracks will be generated during hardening or under external loads, making Cl - , SO 4 2- and other harmful ions and CO 2 Harmful gases such as gas invade the interior of the concrete, accelerate the erosion of the concrete structure, seriously affect the durability of the concrete or cement-based composite structure, and reduce the service life of the structure. [0003] Carbon nanotube is a one-dimensional fiber material ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B16/02C04B18/10C04B14/02
CPCC04B14/024C04B14/026C04B16/02C04B18/101C04B28/04C04B2201/50C04B22/002C04B14/14C04B18/08C04B18/146C04B2103/302C04B24/122C04B12/04C04B2103/50C04B14/06C04B14/068Y02W30/91
Inventor 郑山锁董方园周炎董立国郑捷李健龙立陈家悦黄威曾张晓辉裴培左河山
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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