Preparation method of cold-resistant anti-freezing concrete

Abstract

The invention relates to a preparation method of cold-resistant anti-freezing concrete, which adopts wheat bran as a raw material to prepare a filler with high strength and good toughness, improves the compressive property of the concrete and reduces the mass loss rate, and adopts sodium hydroxide, urea and the like to prepare a response type concrete anti-freezing agent which can effectively reduce the freeze-thaw damage of the concrete. In addition, in the material mixing and stirring process, low-temperature heating is carried out, the false coagulation phenomenon of the materials when cement is added can be avoided, and the prepared concrete has high anti-freezing and cold-resistant performance.

Description

Technical Field

[0001] The invention particularly relates to a method for preparing cold-resistant and frost-resistant concrete. Background Art

[0002] Concrete is one of the most common and important raw materials in construction projects. In winter construction, especially in cold northern regions, high requirements are placed on the concrete's anti-freeze and anti-cold properties. The traditional approach is to add chloride salts to the concrete, but this often causes corrosion to the steel bars due to inadequate dosage control, increases the concrete's electrical conductivity, and reduces the firmness and safety of the structure. Summary of the invention

[0003] The technical problem to be solved by the present invention is: in order to overcome the deficiencies of the prior art, a method for preparing cold-resistant and frost-resistant concrete is provided.

[0004] The technical solution adopted by the present invention to solve the technical problem is: a method for preparing cold-resistant and frost-resistant concrete, which comprises: 11%-15% of water, 5%-15% of cement, 1%-1.5% of nano silicon dioxide, 2%-5% of steel slag, 2%-5% of fly ash, 10%-18% of artificial sand, 18%-25% of crushed stone, 0.1%-0.15% of nano calcium carbonate, 0.2%-0.35% of modified graphene oxide, 1%-2% of bentonite, 1.5%-2.5% of filler, 18%-26% of aggregate and admixture, and the sum of the proportions of each component is 100%;

[0005] The admixture includes air entraining agent, water reducing agent, defoaming agent, retarder and antifreeze agent, and the ratio of the air entraining agent, water reducing agent, defoaming agent, retarder and antifreeze agent is 0.004:4:2:1:1;

[0006] The preparation method of the filler comprises: firstly, extracting ammonium sulfate by using a phosphate buffered saline solution to prepare antifreeze protein, and compounding the prepared antifreeze protein with silicone rubber by using electrostatic spinning to prepare composite fibers, thereby obtaining the target filler;

[0007] The preparation method of the antifreeze agent comprises: firstly, adding sodium hydroxide and urea into water to obtain a mixed solution of sodium hydroxide and urea, then adding hydroxyethyl cellulose and hydroxylated chitosan into the mixed solution to obtain a cellulose / chitosan solution, then adding polyvinyl alcohol and chitosan into the mixed solution of sodium hydroxide and urea to obtain a polyvinyl alcohol / chitosan solution, then uniformly mixing the cellulose / chitosan solution with the chitosan solution, and removing bubbles to obtain the target antifreeze agent;

[0008] The preparation method of the cold-resistant and frost-resistant concrete comprises: firstly, stirring and mixing all materials except the admixture, and in the stirring and mixing process, heating the materials at a heating temperature of ≤40°C for 6-8 hours, then adding a water reducer, a defoamer, a retarder and an antifreeze agent, further stirring and mixing for 1.5-2 hours, and finally adding an air entraining agent and stirring for 1 hour.

[0009] Preferably, the air-entraining agent is a fatty alcohol sulfonate air-entraining agent.

[0010] Preferably, the water reducer is a polyhydroxy acid high performance water reducer.

[0011] Preferably, the defoamer is an organic defoamer.

[0012] Preferably, the retarder mainly consists of sodium lignin sulfonate and calcium sulfonate.

[0013] Preferably, the ratio of the antifreeze agent is 1%-2%.

[0014] The beneficial effects of the present invention are that the preparation method of cold-resistant and frost-resistant concrete adopts wheat bran as a raw material to prepare a filler with high strength and good toughness, thereby improving the compressive strength of concrete and reducing the mass loss rate; sodium hydroxide, urea, etc. are used to prepare a responsive concrete antifreeze agent, which can effectively reduce the freeze-thaw damage of concrete and extend the service life; and during the mixing and stirring process of the materials, low-temperature heating is performed to avoid the false setting phenomenon of the materials when cement is added, so that the prepared concrete has strong antifreeze and cold resistance. DETAILED DESCRIPTION

[0015] Embodiment 1:

[0016] A method for preparing cold-resistant and frost-resistant concrete, the cold-resistant and frost-resistant concrete comprising: 11% of water, 5% of cement, 1% of nano-silicon dioxide, 2% of steel slag, 5% of fly ash, 18% of artificial sand, 21% of crushed stone, 0.1% of nano-calcium carbonate, 0.2% of modified graphene oxide, 1% of bentonite, 1.5% of filler, 18% of aggregate and admixture, and the sum of the proportions of each component is 100%;

[0017] The admixture includes air entraining agent, water reducing agent, defoaming agent, retarder and antifreeze agent, and the ratio of the air entraining agent, water reducing agent, defoaming agent, retarder and antifreeze agent is 0.004:4:2:1:1;

[0018] The preparation method of the cold-resistant and frost-resistant concrete comprises: firstly, stirring and mixing all materials except the admixture, and heating the materials during the stirring and mixing process, the heating temperature is ≤40°C, and the time is 6 hours, then adding a water reducer, a defoamer, a retarder and an antifreeze agent, further stirring and mixing for 1.5 hours, and finally adding an air entraining agent and stirring for 1 hour.

[0019] The data obtained after the experiment are:

[0020] Water reduction rate: 14.3%;

[0021] Water seepage rate ratio: 62.23%;

[0022] Gas content: 3.9%;

[0023] 28-day shrinkage ratio: 103%;

[0024] Penetration height ratio: 79.7%;

[0025] 50 freeze-thaw strength loss ratio: 83%;

[0026] Regarding steel bar corrosion: no obvious corrosion.

[0027] Embodiment 2:

[0028] A method for preparing cold-resistant and frost-resistant concrete, the cold-resistant and frost-resistant concrete comprising: 13% water, 15% cement, 1.5% nano silicon dioxide, 4% steel slag, 2% fly ash, 15% artificial sand, 19% crushed stone, 0.15% nano calcium carbonate, 0.25% modified graphene oxide, 1.5% bentonite, 2.5% filler, 22% aggregate and admixture, the sum of the proportions of each component being 100%;

[0029] The admixture includes air entraining agent, water reducing agent, defoaming agent, retarder and antifreeze agent, and the ratio of the air entraining agent, water reducing agent, defoaming agent, retarder and antifreeze agent is 0.004:4:2:1:1;

[0030] The preparation method of the cold-resistant and frost-resistant concrete comprises: firstly, stirring and mixing all materials except the admixture, and heating the materials during the stirring and mixing process, the heating temperature is ≤40°C, and the time is 8 hours, then adding a water reducer, a defoamer, a retarder and an antifreeze agent, further stirring and mixing for 2 hours, and finally adding an air entraining agent and stirring for 1 hour.

[0031] The data obtained after the experiment are:

[0032] Water reduction rate: 12.3%;

[0033] Water seepage rate ratio: 54.23%;

[0034] Gas content: 3.1%;

[0035] 28-day shrinkage ratio: 99%;

[0036] Penetration height ratio: 87%;

[0037] 50 freeze-thaw strength loss ratio: 90%;

[0038] Regarding steel bar corrosion: no obvious corrosion.

[0039] Compared with the prior art, the preparation method of the cold-resistant and frost-resistant concrete adopts wheat bran as a raw material to prepare a filler with high strength and good toughness, thereby improving the compressive strength of the concrete and reducing the mass loss rate; sodium hydroxide, urea, etc. are used to prepare a responsive concrete antifreeze agent, which can effectively reduce the freeze-thaw damage of the concrete and extend the service life; and during the mixing and stirring process of the materials, low-temperature heating is performed to avoid the false setting of the materials when cement is added, so that the prepared concrete has strong antifreeze and cold resistance.

[0040] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A method for preparing cold-resistant and frost-resistant concrete, characterized in that: The cold-resistant and frost-proof concrete comprises: 11%-15% of water, 5%-15% of cement, 1%-1.5% of nano silicon dioxide, 2%-5% of steel slag, 2%-5% of fly ash, 10%-18% of artificial sand, 18%-25% of crushed stone, 0.1%-0.15% of nano calcium carbonate, 0.2%-0.35% of modified graphene oxide, 1%-2% of bentonite, 1.5%-2.5% of filler, 18%-26% of aggregate and admixture, and the sum of the distribution ratios of each group is 100%; The admixture includes air entraining agent, water reducing agent, defoaming agent, retarder and antifreeze agent, and the ratio of the air entraining agent, water reducing agent, defoaming agent, retarder and antifreeze agent is 0.004:4:2:1:1; The preparation method of the filler comprises: firstly, extracting ammonium sulfate by using a phosphate buffered saline solution to prepare antifreeze protein, and compounding the prepared antifreeze protein with silicone rubber by using electrostatic spinning to prepare composite fibers, thereby obtaining the target filler; The preparation method of the antifreeze agent comprises: firstly, adding sodium hydroxide and urea into water to obtain a mixed solution of sodium hydroxide and urea, then adding hydroxyethyl cellulose and hydroxylated chitosan into the mixed solution to obtain a cellulose / chitosan solution, then adding polyvinyl alcohol and chitosan into the mixed solution of sodium hydroxide and urea to obtain a polyvinyl alcohol / chitosan solution, then uniformly mixing the cellulose / chitosan solution with the chitosan solution, and removing bubbles to obtain the target antifreeze agent; The preparation method of the cold-resistant and frost-resistant concrete comprises: firstly, stirring and mixing all materials except the admixture, and in the stirring and mixing process, heating the materials at a heating temperature of ≤40°C for 6-8 hours, then adding a water reducer, a defoamer, a retarder and an antifreeze agent, further stirring and mixing for 1.5-2 hours, and finally adding an air entraining agent and stirring for 1 hour.

2. The method for preparing cold-resistant and frost-resistant concrete according to claim 1, characterized in that: The air entraining agent is a fatty alcohol sulfonate air entraining agent.

3. The method for preparing cold-resistant and frost-resistant concrete according to claim 1, characterized in that: The water reducing agent is a polyhydroxy acid high performance water reducing agent.

4. The method for preparing cold-resistant and frost-resistant concrete according to claim 1, characterized in that: The defoamer is an organic defoamer.

5. The method for preparing cold-resistant and frost-resistant concrete according to claim 1, characterized in that: The main components of the retarder are sodium lignin sulfonate and calcium sulfonate.

6. The method for preparing cold-resistant and frost-resistant concrete according to claim 1, characterized in that: The proportion of the antifreeze agent is 1%-2%.