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Steel fiber cement-based composite material based on nanoscale reinforcement and preparation method thereof

A nano-scale, composite material technology, applied in clay preparation devices, mixing operation control, cement mixing devices, etc., can solve the problem of reduced fluidity of steel fiber cement-based composite materials, increased electrochemical corrosion, and increased production costs. and other problems, to achieve the effect of using green materials, improving mechanical properties, and saving energy.

Pending Publication Date: 2021-07-06
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, increasing the amount of steel fiber will easily aggravate the fiber agglomeration, resulting in a significant decrease in the fluidity of the steel fiber cement-based composite material mixture, which is not conducive to its construction application in cast-in-place projects; in addition, it is easy to make the material and the external environment A closed loop is formed to increase the risk of electrochemical corrosion; at the same time, most of the steel fibers used are copper-plated steel fibers, and copper plating on the surface of steel fibers consumes a lot of resources, making the cost of steel fibers account for more than half of the total cost, resulting in Dramatic increase in production costs and huge energy consumption

Method used

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  • Steel fiber cement-based composite material based on nanoscale reinforcement and preparation method thereof
  • Steel fiber cement-based composite material based on nanoscale reinforcement and preparation method thereof
  • Steel fiber cement-based composite material based on nanoscale reinforcement and preparation method thereof

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preparation example Construction

[0039] The preparation method of the steel fiber cement-based composite material based on nanoscale reinforcement provided by the present invention comprises the following steps:

[0040] Mixing the nanocellulose fibers with part of the water, performing stirring pre-dispersion and ultrasonic dispersion in sequence to obtain a nanomaterial suspension; the part of the water accounts for 15-20% of the total water mass;

[0041] Mix cement, silica fume, river sand, water reducer, steel fiber, nanomaterial suspension and remaining water to obtain cement-based composite slurry;

[0042] The cement-based composite slurry is sequentially molded, formed, demolded and maintained to obtain the steel fiber cement-based composite material based on nanoscale reinforcement.

[0043] The invention mixes nano cellulose fibers with part of water, and performs stirring pre-dispersion and ultrasonic dispersion in sequence to obtain nano material suspension. In the present invention, it is prefe...

Embodiment 1

[0059] A steel fiber cement-based composite material based on nanoscale reinforcement. The ratio of its raw materials is shown in Table 1. The cement is P O 42.5R ordinary Portland cement, the average particle size of silica fume is 0.24 μm, and the average particle size of river sand is Particle size ≤ 1.18mm, the water reducer is polycarboxylate water reducer, the diameter of the steel fiber is 0.2mm, the length is 13mm, the length of the nanocellulose fiber is 300-400nm, the diameter is 20-50nm, the preparation method is as follows :

[0060] (1) weighing: take raw material by the proportioning in table 1;

[0061] (2) Preparation of nanomaterial suspension: measure a little water in the container, the quality of the water taken accounts for 20% of the total water quality, and add the magnetic rotor and the nanocellulose fiber of getting a good sample respectively in the container with water, Stir for 5min under the condition that the rotating speed is 1000rpm (stirring te...

Embodiment 2

[0080] A steel fiber cement-based composite material based on nanoscale reinforcement, the ratio of its raw materials is shown in Table 3, and the rest are the same as in Example 1.

[0081] The ratio of raw materials of table 3 embodiment 2 steel fiber cement-based composite material

[0082] Cement / g Silica fume / g River sand / g water / g Superplasticizer / g Steel fiber / g Nanocellulose fiber / g Example 2 863 215.7 1078.5 169.5 32.4 156 0.579

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Abstract

The invention provides a steel fiber cement-based composite material based on nanoscale reinforcement and a preparation method thereof, and relates to the technical field of cement-based composite materials. The composite material provided by the invention is prepared from the following components in percentage by mass: 25 to 40 percent of cement, 7.5 to 10.5 percent of silica fume, 35 to 50 percent of river sand, 5 to 7.5 percent of water, 1 to 1.5 percent of water reducing agent, 5 to 9 percent of steel fiber and 0.01 to 0.15 percent of nano cellulose fiber. A small amount of nano cellulose fibers are added into the steel fiber cement-based composite material, a steel fiber-cement matrix interface transition area is subjected to nano-scale improvement in a mode of reinforcing a matrix through the nano-crystalline cellulose fibers, and the mechanical property can be remarkably improved under the condition of low steel fiber mixing amount; the nano-crystalline cellulose fiber has hydrophilicity and can be tightly combined with the cement matrix, so that the mechanical property of the composite material can be improved; and the nano cellulose fiber also has the characteristics of wide material sources and environmental protection.

Description

technical field [0001] The invention relates to the technical field of cement-based composite materials, in particular to a nano-scale reinforced steel fiber cement-based composite material and a preparation method thereof. Background technique [0002] Steel fiber cement-based composite material is a new type of cement-based composite material known for its low porosity and high durability on the premise of ultra-high strength. It has broad applications in bridge engineering, water conservancy engineering, national defense engineering, municipal engineering, etc. Prospects, especially in bridge engineering, steel fiber cement-based composite materials are widely used in main girder structures, arch bridge main arches, bridge deck structures, etc. as stressed components. Steel fiber cement-based composite materials are mainly composed of steel fibers and cement matrix. The incorporation of steel fibers changes the failure mode of cement-based materials from brittle failure t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B14/48C04B18/24B28B1/52B28B1/08B28C5/40B28C7/00
CPCC04B28/04C04B14/48C04B18/24B28B1/523B28B1/525B28B1/08B28C5/402B28C5/404B28C7/0007C04B2201/50C04B18/146C04B14/06C04B2103/302Y02W30/91
Inventor 周傲刘铁军邹笃建李烨魏慧男阙子超
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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