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A kind of carbon nanotube modified shrinkage reducing agent and its preparation method and application

A technology of carbon nanotube modification and carbon nanotube, which is applied in the field of carbon nanotube modified shrinkage reducer, preparation of carbon nanotube modified shrinkage reducer, and shrinkage reducer. Crack resistance, reduce the mechanical properties of concrete and other issues, to achieve the effect of improving durability, reducing autogenous shrinkage, and enhancing strength

Active Publication Date: 2017-11-03
南京安居建合建筑科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the plastic shrinkage and crack resistance of concrete is mainly improved by adding admixtures (such as shrinkage reducing agents) or fibers (such as polypropylene fibers). General shrinkage reducing agents can greatly reduce drying shrinkage and relatively small increase plastic shrinkage. Crack resistance has little effect on improving early self-shrinkage, and reduces the mechanical properties of concrete to a certain extent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A carbon nanotube modified shrinkage reducing agent is composed of the following components in mass percentage, 10% of carbon nanotube, 69.9% of polyethylene glycol, 20% of coupling agent, and 0.1% of defoaming agent. The carbon nanotubes are multi-walled carbon nanotubes (MWNT) with carboxyl groups, the aspect ratio is 500-3000, the Young's modulus is 1TPa, the tensile strength is 63GPa, the bending strength is 14GPa, and the coupling agents are KH550 and KH560. Drop into carbon nanotubes at a mass ratio of 1:1, and the defoaming agent is tributyl phosphate.

[0018] The preparation method of the carbon nanotube modified shrinkage reducing agent comprises the following steps: accurately weighing 5g of MWNT, pouring it into a beaker, dropping 5g of KH550 and 5g of KH560 into it, and then adding 34.95g of polyethylene glycol. Put the resulting mixture into an ultrasonic cell disruptor, turn on the power, set the power (80W) and the highest warning temperature (35°C), con...

Embodiment 2

[0021] A carbon nanotube modified shrinkage reducing agent is composed of the following components in mass percentage, 12.5% ​​of carbon nanotubes, 62.2% of polyethylene glycol, 25% of coupling agent, and 0.3% of defoaming agent. The carbon nanotubes are multi-walled carbon nanotubes (MWNT) with carboxyl groups, the aspect ratio is 500-3000, the Young's modulus is 1TPa, the tensile strength is 63GPa, the bending strength is 14GPa, and the coupling agents are KH550 and KH560. Drop into carbon nanotubes at a mass ratio of 1:1, and the defoaming agent is tributyl phosphate.

[0022] The preparation method of the carbon nanotube modified shrinkage reducing agent includes the following steps: accurately weigh 6.25g MWNT, pour it into a beaker, drop 6.25g KH550 and 6.25g KH560 into it, and then add 31.1g polyethylene glycol. Put the resulting mixture into an ultrasonic cell disruptor, turn on the power, set the power (100W) and the highest warning temperature (40°C), control the tem...

Embodiment 3

[0025] A carbon nanotube modified shrinkage reducing agent is composed of the following components in mass percentage: 15% carbon nanotubes, 54.4% polyethylene glycol, 30% coupling agent, and 0.6% defoaming agent. The carbon nanotubes are multi-walled carbon nanotubes (MWNT) with carboxyl groups, the aspect ratio is 500-3000, the Young's modulus is 1TPa, the tensile strength is 63GPa, the bending strength is 14GPa, and the coupling agents are KH550 and KH560. Drop into carbon nanotubes at a mass ratio of 1:1, and the defoaming agent is tributyl phosphate.

[0026] The preparation method of the above-mentioned carbon nanotube modified shrinkage reducing agent comprises the following steps: accurately weigh 7.5g MWNT, pour it into a beaker, drop 7.5g KH550 and 7.5gKH560 of the required quality into it, and then add 27.2g polyethylene glycol . Put the resulting mixture into an ultrasonic cell disruptor, turn on the power, set the power (120W) and the highest warning temperature ...

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Abstract

The invention discloses a carbon nano tube modified shrinkage reducing agent. The carbon nano tube modified shrinkage reducing agent is prepared from, by mass, 10% to 15% of carbon nano tubes, 54.4% to 69.9% of polyethylene glycol, 20% to 30% of coupling agent and 0.1% to 0.6% of antifoaming agent. The invention further discloses a preparation method and application of the carbon nano tube modified shrinkage reducing agent. According to the prepared carbon nano tube modified shrinkage reducing agent, early self contraction of a cement-based material is reduced by 14% to 33%, 28d breaking strength is increased by 20% to 37%, and compressive strength is increased by 25% to 43%. The carbon nano tube modified shrinkage reducing agent has the function of remarkably reducing the self contraction effect of the high-performance cement-based material, the strength of a cement-based composite is increased, and durability is improved.

Description

technical field [0001] The invention belongs to the technical field of concrete structure engineering such as civil engineering, bridge engineering and ocean engineering, and relates to a shrinkage reducing agent for reducing the self-shrinkage of cement-based materials, in particular to a carbon nanotube modified shrinkage reducing agent. The invention also relates to a carbon nanotube modified shrinkage reducing agent. The preparation method of nanotube modified shrinkage reducer. Background technique [0002] With the application of high-performance concrete, autogenous shrinkage has gradually attracted people's attention. And with the decrease of water-cement ratio, the self-shrinkage phenomenon is more obvious. In the application process of modern cement concrete, durability has gradually been paid attention to. Improving the volume stability of cement concrete can reduce cracking, thereby ensuring the mechanical properties and durability of building materials. At pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/42
CPCC04B40/0039C04B2103/0068C04B14/026C04B24/32C04B24/42C04B24/003
Inventor 刘小艳傅峰刘静梁涛夏苏鲁赵嘉静戴俊
Owner 南京安居建合建筑科技有限公司