Multiwall carbon nanotube cement-based composite material and preparation method thereof

A technology of multi-wall carbon nanotubes and composite materials, which is applied in the field of multi-wall carbon nanotube cement-based composite materials and its preparation, can solve problems such as multi-wall carbon nanotube agglomeration, and achieves simple and easy operation, small average pore size, cost controllable effect

Inactive Publication Date: 2018-08-03
CHINA STATE CONSTRUCTION ENGINEERING CORPORATION +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The invention provides a multi-walled carbon nanotube cement-based composite material and a preparation method thereof, which solves the problem of agglomeration of the multi-walled carbon nanotube, can prevent the secondary agglomeration of the multi-walled carbon nanotube in the cement-based composite material, and effectively improves the cement-based material. mechanical properties

Method used

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  • Multiwall carbon nanotube cement-based composite material and preparation method thereof
  • Multiwall carbon nanotube cement-based composite material and preparation method thereof
  • Multiwall carbon nanotube cement-based composite material and preparation method thereof

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preparation example Construction

[0030] The preparation method specifically comprises the following steps:

[0031] Step 1, add the surfactant into ethanol and stir until completely dissolved; wherein, the surfactant is alkylphenol polyoxyethyl ether, sodium lauryl sulfate, sodium dodecylbenzenesulfonate, dodecyl One or more of sodium sulfonate, polyvinylpyrrolidone, and gum arabic.

[0032] Step 2, add multi-walled carbon nanotubes, nano-silica and glass beads, and perform mechanical stirring, grinding and dispersion for 1-1.5 hours;

[0033] Step 3, after filtering, place in an ultrasonic dispersion device for 0.5-1 hour ultrasonic dispersion to obtain a multi-walled carbon nanotube dispersion;

[0034] Step 4, after stirring the cementitious material, silica fume, and standard sand with water, add the dispersion liquid obtained in step 3, and stir evenly;

[0035] Step 5, put the multi-walled carbon nanotube cement-based slurry uniformly stirred in step 4 into a drying oven to keep at 50°C-60°C, and dry ...

Embodiment 1-5

[0041] Embodiment 1-5 concrete performance test sees the following table:

[0042] Table 2 Examples 1-5 Composite mechanical properties

[0043]

[0044] The following conclusions can be drawn from the results in Table 2:

[0045] (1) It can be seen from the control group that the compressive strength of the concrete test block prepared without adding carbon nanotubes is about 48MPa. Examples 1-3 all add a certain amount of multi-walled carbon nanotubes and after ultrasonic treatment, the mechanical properties of the cement-based composite material are significantly improved, and the compressive strength is increased by 11.6%-20.99%.

[0046] (2) In Example 3 and Example 4, although the addition ratio of carbon nanotubes is the same as 0.3%, the mechanical properties of the cement-based composite material in Example 4 do not increase but decrease, because the addition of carbon nanotubes is too high , not well dispersed, agglomeration occurred in the cement-based material...

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Abstract

The invention relates to a multiwall carbon nanotube cement-based composite material and a preparation method thereof. The composite material is prepared from the following raw materials in parts by weight: 0.4 to 0.7 part of surfactant, 10 to 20 parts of ethanol, 0.05 to 0.15 part of multiwall carbon nanotubes, 1.5 to 1.8 parts of nano silicon dioxide, 100 parts of cement gelling material, 10 to20 parts of silica fume, 300 to 400 parts of standard sand, and 40 to 60 parts of water. The multiwall carbon nanotube is added into the cement-based composite material, so that the composite materialis low in porosity, small in average aperture, and compact in structure, thereby improving the mechanical performance of the material. By virtue of determination, the pressure resistant strength is increased by 11.6 to 20.99 percent, so that the service life of a building is effectively prolonged. The method disclosed by the invention is simple and easy in operation, controllable in cost, capableof solving the agglomeration problem of the multiwall carbon nanotube, and capable of preventing the secondary agglomeration of the multiwall carbon nanotube in the cement-based composite material. In the current construction process of smart cities and green cities, the multiwall carbon nanotube cement-based composite material have wide market prospect and application value.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a multi-walled carbon nanotube cement-based composite material and a preparation method thereof. Background technique [0002] Due to the low tensile strength and poor toughness of ordinary cement-based materials, a large number of cracks often occur in engineering, which seriously affects the safety and long-term durability of the structure. The problem of toughening and high durability has become the research focus of cement-based materials. The current methods mainly focus on introducing a certain amount of macro-sized fibers into the cement matrix, such as steel fibers, carbon fibers, glass fibers, polypropylene fibers, etc., to improve cracks and space loads. However, these microfibers, long fibers, etc. can only improve the mechanical properties of the body from the macro scale or the millimeter scale, but cannot fundamentally limit the expansion of nanoscale c...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B14/02
CPCC04B14/026C04B28/00C04B2201/50C04B24/2652C04B24/026C04B14/06C04B18/146
Inventor 秦杰张涛蒋立红屈建贾汝锋张卫东李艳稳
Owner CHINA STATE CONSTRUCTION ENGINEERING CORPORATION
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