Multi-walled carbon nanotube modified active powder concrete with strength grade of C100 or above and preparation method of multi-walled carbon nanotube modified active powder concrete

A technology of multi-walled carbon nanotubes and active powder, which is applied in the field of concrete to achieve obvious effects, improve the flexural strength and fatigue resistance, and improve the strength

Pending Publication Date: 2020-08-11
NORTHEAST FORESTRY UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a kind of multi-walled carbon nanotube modified active powder concrete with strength grade C100 or more and its preparation method, to solve the problem that the concrete prepared in the prior art cannot improve its basic mechanical properties while improving the active powder concrete. Disadvantages of bending fatigue

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  • Multi-walled carbon nanotube modified active powder concrete with strength grade of C100 or above and preparation method of multi-walled carbon nanotube modified active powder concrete
  • Multi-walled carbon nanotube modified active powder concrete with strength grade of C100 or above and preparation method of multi-walled carbon nanotube modified active powder concrete
  • Multi-walled carbon nanotube modified active powder concrete with strength grade of C100 or above and preparation method of multi-walled carbon nanotube modified active powder concrete

Examples

Experimental program
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Effect test

specific Embodiment approach 1

[0028] A multi-walled carbon nanotube modified active powder concrete with a strength grade above C100, which is made of concrete cementitious material, steel fiber, aggregate, water, water reducing agent and carbon nanotube, carbon nanotube and concrete cementitious material The mass ratio is 0.05% to 0.15%. The weight fraction of the concrete matrix (concrete excluding carbon nanotubes) consists of: 31-33 parts of quartz sand, 22-24 parts of cement, 13-15 parts of quartz powder, 6-8 parts of water, 5-7 parts of silica fume, 4-6 parts of fly ash, 3-4 parts of steel fiber, 0.8-1.2 parts of superplasticizer.

[0029] The above-mentioned multi-walled carbon nanotubes modified active powder concrete with a strength grade above C100, the mass fraction of the multi-walled carbon nanotubes is 0.05% to 0.15% of the cementitious material, when the amount of multi-walled carbon nanotubes exceeds the above-mentioned At the upper limit of the range, MWCNTs will be unevenly dispersed and...

Embodiment 1

[0039] Compressive strength: In this embodiment, a total of 4 groups of test pieces were produced, of which 1 group without adding carbon nanotubes was used as the control group, and 3 groups of carbon nanotube-modified RPC were used as the test group.

[0040] The matrix concrete mix ratio is the same as in Example 1.

[0041] The compressive strength test uses a cube with a side length of 100mm×100mm×100mm, and three specimens are made for each group. The test groups and test results are as follows:

[0042]

[0043] As can be seen from the test data in the table, the present invention can give full play to the beneficial effect of carbon nanotubes through appropriate raw materials and carbon nanotube proportions, thereby greatly improving the compressive strength of concrete, which is 10.95% higher than that of the control group RPC , 16.25%.

Embodiment 2

[0045] Axial compressive strength test: In this embodiment, 4 groups of test pieces were produced, of which 1 group was not added with multi-walled carbon nanotubes as a control group, and 3 groups were mixed with multi-walled carbon nanotubes RPC as a test group. The weight fraction of matrix concrete is composed of: per 100 parts of concrete matrix, 31-33 parts of quartz sand, 22-24 parts of cement, 13-15 parts of quartz powder, 6-8 parts of water, 5-7 parts of silica fume, and fly ash 4-6 parts, 3-4 parts of steel fiber, 0.8-1.2 parts of superplasticizer.

[0046]The axial compressive strength test adopts a cuboid of 100mm×100mm×300mm, and three specimens are made for each group. The test groups and test results are as follows:

[0047]

[0048]

[0049] As can be seen from the test data in the table, the present invention can give full play to the beneficial effect of nanomaterials through appropriate raw materials and carbon nanotube proportions, thereby greatly imp...

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Abstract

The invention discloses multi-walled carbon nanotube modified active powder concrete with the strength grade of C100 or above and a preparation method of the multi-walled carbon nanotube modified active powder concrete, belongs to the technical field of concrete, and overcomes the defect that the fatigue resistance of the existing prepared active powder concrete cannot be improved while the basicmechanical property of the active powder concrete is improved. The multi-walled carbon nanotubes are doped into the concrete, so that the compression strength, the breaking strength and the fatigue life are remarkably improved, and the concrete can be applied to structures with requirements on strength and fatigue performance. The preparation method comprises the following steps: weighing the cement, the fly ash, the silica fume and the quartz sand / powder according to the weight, putting the raw materials into a mixture, uniformly mixing, adding the multi-walled carbon nanotubes into a properamount of water, and carrying out ultrasonic dispersion to obtain multi-walled carbon nanotube slurry; and finally, putting the residual water, a polycarboxylate superplasticizer and the multi-walledcarbon nanotube slurry into the dry materials, and uniformly stirring to obtain the multi-walled carbon nanotube modified active powder concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a multi-walled carbon nanotube modified active powder concrete with a strength grade above C100 and a preparation method thereof. Background technique [0002] Active powder concrete (Reactive Powder Concrete, hereinafter referred to as RPC) is relatively dense and has low porosity, which improves the uniformity, strength and durability of the system as a whole. It is often used in water conservancy, bridges and military, not only can prevent radioactive substances Leaks from the inside and is resistant to external aggressive media. Its own high-strength performance, in practical applications, can use thinner sections or innovative section shapes, so that the structure's self-weight is much lighter than ordinary concrete structures, and RPC can reduce the amount of stirrups and stress bars, and even Stirrups may not be provided. However, reactive powder concrete an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00
CPCC04B28/00C04B2201/50C04B18/08C04B18/146C04B14/48C04B14/06C04B14/026C04B2103/302
Inventor 王钧宋哲生段玉鑫赵金友毕彦秀伊心宇王欣然刘奇
Owner NORTHEAST FORESTRY UNIVERSITY
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