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A kind of ultra-high performance fiber concrete of C220 strength grade containing coarse aggregate and its preparation method

A technology of fiber-reinforced concrete and strength grades, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc. The effect of the process

Active Publication Date: 2019-12-17
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the existing research, the ultra-high performance concrete containing coarse aggregate is obviously brittle and has poor deformation resistance, which limits the application of this type of concrete in actual engineering. On the basis of performance, improve the strength of concrete and greatly improve the toughness of concrete, and prepare ultra-high performance fiber concrete with compressive strength above 200MPa, containing coarse aggregate, high toughness and ultra-high durability

Method used

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  • A kind of ultra-high performance fiber concrete of C220 strength grade containing coarse aggregate and its preparation method

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preparation example Construction

[0052] A kind of preparation method of the ultra-high-performance fiber concrete of the C220 intensity grade that the present invention contains coarse aggregate, comprises the following steps:

[0053] 1) Add 11.5 parts of activator and 2.9 parts of defoamer into water with a total water content of 25% and record it as aqueous solution 1. Disperse 15.5 parts of water reducer and 48 parts of hydroxyl modified carbon nanotubes Liquid and 50 parts of graphene oxide dispersions are added to the water of 50% of total water content, denoted as aqueous solution 2;

[0054] 2) Add 750 parts of fine aggregate (the mass ratio of river sand to quartz sand is 6:4), 900 parts of gravel, 1.7 parts of cellulose fiber and 78 parts of copper-coated microwire steel fiber into the mixer in sequence , stir evenly for 3-5min;

[0055] 3) Then, add 545 parts of cement, 72 parts of fly ash, 65 parts of rice husk ash, and 140 parts of silica fume in sequence, and add the aqueous solution 1 prepared...

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Abstract

The invention discloses a C220 ultra-high-performance fiber concrete containing coarse aggregate and a preparation method thereof. The mass parts of the concrete are as follows: 545 parts of cement, 63 parts of water, 900 parts of crushed stone, fine aggregate 750 parts, 72 parts of fly ash, 65 parts of rice husk ash, 140 parts of silica fume, 15.5 parts of water reducing agent, 11.5 parts of activator, 1.7 parts of cellulose fiber, 78 parts of steel fiber, hydroxyl modified carbon nanotube dispersion 48 parts, 50 parts of graphene oxide dispersion, 2.9 parts of defoamer. The prepared concrete has high toughness and durability, and has a high bond strength with the steel, with a compressive strength of 224.31MPa, a flexural strength of 47.45MPa, and a splitting tensile strength of 22.37MPa. The bonding strength reaches 8.92MPa, and the chloride ion impermeability level reaches level VI. Used in steel-concrete composite structures, it can effectively exert the synergistic performance between steel and concrete, make up for the poor bonding performance of steel and concrete, and the inability to give full play to their respective mechanical properties.

Description

technical field [0001] The invention belongs to the field of new building materials, and is a high-strength, high-toughness and high-durability superhigh-strength building material containing coarse aggregate mixed with rice husk ash, cellulose fiber, steel fiber, modified carbon nanotube and graphene oxide. The performance concrete particularly relates to an ultra-high-performance fiber concrete with high toughness and a C220 strength grade containing coarse aggregate 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 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B20/02C04B14/48C04B14/02C04B18/10C04B16/02C04B111/20
CPCC04B20/023C04B28/04C04B2111/20C04B2201/52C04B2201/50C04B14/14C04B14/068C04B14/06C04B18/08C04B18/101C04B18/146C04B2103/302C04B12/04C04B24/122C04B18/24C04B14/48C04B14/026C04B14/024C04B2103/50C04B28/02Y02W30/91C04B18/06
Inventor 郑山锁宋明辰董方园张艺欣郑捷郑淏张晓辉牛丽华曹琛郑跃黄威曾蔡永龙
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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