Anti-cracking recycled concrete and preparation method thereof

A recycled concrete and anti-cracking technology, applied in the field of concrete, can solve the problems of reduced service life, easy cracking of concrete, and decreased durability of concrete

Inactive Publication Date: 2020-08-07
车春花
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] When using concrete, due to the high temperature and low temperature changes in the natural environment, concrete is prone to cracking during use, resulting in a decline in the durability of concrete and a greatly reduced service life. At the same time, it also has a greater safety hazard when used.

Method used

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  • Anti-cracking recycled concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] S1: Prepare materials:

[0054] S2: Preparation of azide cyclodextrin:

[0055] Take β-cyclodextrin, recrystallize 3 times in aqueous solution, filter, dry in vacuum for 24 hours, then place in sodium hydroxide solution, stir for 10 minutes, slowly add acetonitrile solution of p-toluenesulfonyl chloride dropwise, and adjust the pH during the dropwise addition To 13, react for 3 hours, then adjust the pH to 7, add methanol, stir for 30 minutes, filter, take the filtrate, stand at -8°C for 24 hours, collect the precipitate, pass through a G25 gel column to desalt, freeze-dry to reach sulfonated cyclodextrin ;

[0056] Dissolve sulfonated cyclodextrin and N,N-dimethylformamide solution, stir for 10 minutes, refrigerate and vacuum 3 times, then add sodium azide, heat up to 60°C, stir for 48 hours, collect the product, freeze-dry , to obtain azide cyclodextrin;

[0057] S3: Preparation of modified nanotubes:

[0058] Take bromoacetyl bromide and dissolve it in dichlorome...

Embodiment 2

[0070] S1: Prepare materials:

[0071] S2: Preparation of azide cyclodextrin:

[0072] Take β-cyclodextrin, recrystallize 3 times in aqueous solution, filter, dry in vacuum for 24 hours, then place in sodium hydroxide solution, stir for 13 minutes, slowly add acetonitrile solution of p-toluenesulfonyl chloride dropwise, and adjust the pH during the dropwise addition To 13, react for 3.5 hours, then adjust the pH to 7, add methanol, stir for 35 minutes, filter, take the filtrate, stand at -8°C for 28 hours, collect the precipitate, pass through a G25 gel column to desalt, freeze-dry to achieve sulfonated cyclopaste Refined;

[0073] Dissolve sulfonated cyclodextrin and N,N-dimethylformamide solution, stir for 12 minutes, refrigerate and vacuum 3 times, then add sodium azide, heat up to 63°C, stir for 49 hours, collect the product, freeze-dry , to obtain azide cyclodextrin;

[0074] S3: Preparation of modified nanotubes:

[0075] Take bromoacetyl bromide and dissolve in dich...

Embodiment 3

[0087] S1: Prepare materials:

[0088] S2: Preparation of azide cyclodextrin:

[0089] Take β-cyclodextrin, recrystallize 3 times in aqueous solution, filter, dry in vacuum for 24 hours, then place in sodium hydroxide solution, stir for 15 minutes, slowly add acetonitrile solution of p-toluenesulfonyl chloride dropwise, and adjust the pH during the dropwise addition To 13, react for 4 hours, then adjust the pH to 7, add methanol, stir for 40 minutes, filter, take the filtrate, stand at -8°C for 30 hours, collect the precipitate, pass it through a G25 gel column to desalt, freeze-dry to reach sulfonated cyclodextrin ;

[0090] Dissolve sulfonated cyclodextrin and N,N-dimethylformamide solution, stir for 15 minutes, refrigerate and vacuum 4 times, then add sodium azide, heat up to 65°C, stir for 50 hours, collect the product, freeze-dry , to obtain azide cyclodextrin;

[0091] S3: Preparation of modified nanotubes:

[0092] Take bromoacetyl bromide and dissolve it in dichlor...

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Abstract

The invention discloses anti-cracking recycled concrete and a preparation method thereof. During use of the concrete, if cracks appear on the surface of the concrete, polyurethane polymer cross-linkednanotubes in modified nanotubes are broken, disulfide bonds and hot hydrogen bonds can be matched with each other through high temperature of the environment, and self-repairing of the cracks is achieved; meanwhile, under the status, the high temperature enables the form of the nanotube with temperature responsiveness to be changed into a vesicle shape and the volume to be shrunk, so that component movement occurs in the concrete, the vesicle shape is recovered into the nanotube form after the temperature is reduced, and the nanotube can be connected with the nanotube with non-temperature responsiveness again to cooperate with the polyurethane polymer cross-linked nanotube to jointly carry out self-repairing of cracks. The invention discloses the anti-cracking recycled concrete and a preparation method thereof, wherein the anti-cracking recycled concrete is reasonable in process design and proper in component proportion, and the prepared concrete not only has excellent mechanical properties and anti-cracking performance, but also can self-repair cracks.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to an anti-cracking recycled concrete and a preparation method thereof. Background technique [0002] Concrete is one of the most important contemporary civil engineering materials. It is prepared in a certain proportion by cementitious materials, granular aggregates (also known as aggregates), water, and admixtures and admixtures added when necessary. It is a kind of artificial stone material that is uniformly mixed, densely formed, cured and hardened. With the rapid development of the economy, concrete has gradually entered our lives. Nowadays, concrete has become an indispensable product in our daily life and can be used in construction. Engineering, pavement structure and many other aspects. [0003] When concrete is used, due to the high and low temperature changes in the natural environment, concrete is prone to cracking during use, resulting in a decline in the durability o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B16/08C08B37/16C08G18/66C08G18/42C08G18/32C04B111/34
CPCC04B16/082C04B28/00C04B2111/0075C04B2111/343C08B37/0012C08G18/3868C08G18/42C08G18/6651C04B2103/302C04B18/08C04B14/06C04B14/4643C04B18/16C04B24/00C04B24/34C04B18/146C04B24/26C04B18/141
Inventor 车春花
Owner 车春花
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