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Anti-freezing concrete and preparation method thereof

A technology of concrete and waste concrete, which is applied in the field of concrete preparation, can solve problems affecting the long-term use and safe operation of buildings, slow strength development, concrete damage, etc., and achieve the effects of improving internal pore structure, increasing ultimate strain, and increasing bearing capacity

Inactive Publication Date: 2020-11-20
梁伟虹
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Concrete freeze-thaw damage is one of the main problems of building aging diseases in my country, which seriously affects the long-term use and safe operation of buildings. An important problem in the construction of concrete at negative or low temperatures is that the strength develops very slowly, and negative temperatures can cause The volume expansion caused by the phase change of water causes extremely serious damage to the concrete

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0062] According to the mass ratio of 1:8, the wheat bran powder and the PBS buffer solution with a pH of 25mmol / L and a pH of 7.8 are mixed, and at a stirring speed of 700r / min, stirring and extracting for 3h is obtained to obtain a mixed extract; The extract was centrifuged at a centrifugal speed of 3000r / min for 5min. After the separation, the supernatant was collected, and the supernatant was precipitated with 100% saturated ammonium sulfate. The precipitate was filtered and placed in an oven at a temperature of 40°C. Dry in medium to constant weight and cool to room temperature to obtain antifreeze protein; mix antifreeze protein, silicone rubber and methylene chloride at a mass ratio of 1:6:18, stir at a high speed of 1000r / min at room temperature for 6h, The mixed slurry is obtained, and the spinning solution is obtained by standing for defoaming; the spinning solution is subjected to electrospinning treatment, the needle of the syringe is connected to a high-voltage pos...

example 2

[0064] According to the mass ratio of 1:8, the wheat bran powder and the PBS buffer solution with a pH of 25mmol / L and a pH of 7.8 are mixed, and at a stirring speed of 750r / min, stirring and extracting for 4h to obtain a mixed extract; The extract was centrifuged at a centrifugal speed of 3500r / min for 8 minutes. After the separation, the supernatant was collected, and the supernatant was precipitated with 100% saturated ammonium sulfate. The precipitate was filtered and placed in an oven at a temperature of 45°C. Dry in medium to constant weight and cool to room temperature to obtain antifreeze protein; mix antifreeze protein, silicone rubber and methylene chloride at a mass ratio of 1:6:18, stir at a stirring speed of 1500r / min at room temperature for 7h, The mixed slurry is obtained, and the spinning solution is obtained by standing for defoaming; the spinning solution is subjected to electrospinning treatment, the needle of the syringe is connected to a high-voltage positi...

example 3

[0066] According to the mass ratio of 1:8, the wheat bran powder and the PBS buffer solution with a pH of 25mmol / L and a pH of 7.8 are mixed, and at a stirring speed of 800r / min, stirring and extracting for 4h to obtain a mixed extract; The extract was centrifuged at a centrifugal speed of 4000r / min for 10min. After the separation, the supernatant was collected, and the supernatant was precipitated with 100% saturated ammonium sulfate. The precipitate was filtered and placed in an oven at a temperature of 50°C. Dry in medium to constant weight, cool to room temperature to obtain antifreeze protein; mix antifreeze protein, silicone rubber and methylene chloride at a mass ratio of 1:6:18, stir at a high speed of 2000r / min at room temperature for 8h, The mixed slurry is obtained, and the spinning solution is obtained by standing for defoaming; the spinning solution is subjected to electrospinning treatment, the needle of the syringe is connected to a high-voltage positive power su...

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Abstract

The invention relates to an anti-freezing concrete and a preparation method thereof, and belongs to the technical field of concrete preparation. Wheat bran is used as a raw material; ammonium sulfateprecipitate is extracted by adopting a phosphate buffer salt solution to prepare antifreeze protein, the prepared antifreeze protein and silicone rubber are compounded to prepare composite fibers by adopting electrostatic spinning, and the composite fibers are taken as a filler of the high-strength antifreeze concrete so as to prepare the high-strength antifreeze concrete with light weight, good elasticity, toughness, durability and shock absorption performance. The prepared anti-freezing concrete has an excellent compression resistant and anti-freezing performance, under the condition that the compression resistance of the concrete is not changed, the larger the mass loss rate is, the poorer the anti-freezing performance is, and otherwise, the better the anti-freezing performance is.

Description

technical field [0001] The invention relates to a frost-resistant concrete and a preparation method thereof, belonging to the technical field of concrete preparation. Background technique [0002] At present, common durability diseases mainly include concrete cracks, carbonization, freeze-thaw damage, steel bar corrosion, water quality erosion, leakage and dissolution, among which freeze-thaw damage is more obvious. Freeze-thaw damage is the damage caused by freeze-thaw cycles when concrete is saturated with water, and frost resistance refers to the ability of concrete to resist freeze-thaw damage. The frost resistance of concrete is particularly important for the durability of roads, bridges, and hydraulic concrete working in the field. [0003] Frost resistance, as an important factor affecting the durability of concrete, has always been a hot topic of research by scholars at home and abroad. exist [0004] In the northern region of my country, the concrete structure be...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B16/06C04B14/38C04B24/18C04B111/20C04B103/30
CPCC04B14/386C04B16/0675C04B24/18C04B28/04C04B2103/302C04B2111/20C04B2201/50C04B18/16C04B14/068C04B22/002
Inventor 梁伟虹陈宇超谢真
Owner 梁伟虹
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