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A kind of C230 strength grade ultra-high performance fiber concrete 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: 2019-11-26
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Description
  • Claims
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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 C230 strength grade ultra-high performance fiber concrete containing coarse aggregate and its preparation method

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preparation example Construction

[0052] A kind of preparation method of the C230 strength class ultra-high performance fiber concrete containing coarse aggregate of the present invention, comprises the following steps:

[0053] 1) Add 11 parts of activator and 2.9 parts of defoamer into water with a total water content of 25% in parts by mass, which is recorded as aqueous solution 1, and disperse 16 parts of water reducing agent and 50 parts of hydroxyl modified carbon nanotubes Liquid and 52 parts of graphene oxide dispersions were added to 50% water, which was denoted as aqueous solution 2;

[0054] 2) 780 parts of fine aggregate (the mass ratio of river sand and quartz sand is 6:4), 900 parts of gravel, 1.7 parts of cellulose fiber and 78 parts of copper-coated microwire steel fiber were added to the mixer in sequence, Stir evenly for 3-5 minutes;

[0055] 3) Then, add 560 parts of cement, 75 parts of fly ash, 63 parts of rice husk ash, and 145 parts of silica fume in sequence, and add the aqueous solutio...

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Abstract

The invention discloses a C230 strength class ultra-high-performance fiber concrete containing coarse aggregate and a preparation method thereof. The mass parts of the concrete are as follows: 560 parts of cement, 64 parts of water, 900 parts of gravel, and 780 parts of fine aggregate 75 parts of fly ash, 63 parts of rice husk ash, 145 parts of silica fume, 16 parts of water reducing agent, 11 parts of activator, 1.7 parts of cellulose fiber, 78 parts of steel fiber, 50 parts of hydroxyl modified carbon nanotube dispersion Parts, 52 parts of graphene oxide dispersion liquid, 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 235.48MPa, a flexural strength of 48.23MPa, and a splitting tensile strength of 22.95MPa. The bonding strength reaches 9.24MPa, 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 a C230 strength class ultra-high-performance fiber concrete containing coarse aggregate with high toughness 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 ser...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C04B16/02C04B18/10C04B14/02
CPCC04B14/024C04B14/026C04B16/02C04B18/101C04B28/04C04B2201/50C04B22/002C04B14/14C04B14/06C04B14/068C04B18/08C04B18/146C04B2103/302C04B12/04C04B24/122C04B14/48C04B2103/50Y02W30/91
Inventor 郑山锁董方园龙立张晓辉刘巍郑捷李强强黄威曾陈家悦秦卿李健宋明辰
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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