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Recycled concrete and preparation method thereof

A technology of recycled concrete and recycled aggregate, applied in the field of concrete, can solve problems such as poor compressive strength, achieve good wear resistance, not easy to crack, and improve the effect of tensile strength

Active Publication Date: 2020-06-23
陕西百固建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Because the waste concrete is subjected to a large external force during the crushing process, a large number of fine cracks will appear inside the aggregate, so that the water absorption rate and water absorption rate of the recycled aggregate are much higher than that of the natural aggregate, and the compressive strength is poor.

Method used

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  • Recycled concrete and preparation method thereof
  • Recycled concrete and preparation method thereof
  • Recycled concrete and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] S1: Mechanically crush and activate the recycled aggregate, and screen out the aggregate with a particle size of 5-15mm;

[0036] S2: remove the dust on the surface of the aggregate obtained in S1 by air blowing;

[0037] S3: Prepare Bacillus pasteurian culture medium, add 5g of yeast powder, 5g of trimethylglycine, 10g of tryptone, 5g of ammonium sulfate, 2g of glutamic acid, and 10g of urea into 1L of ultrapure water, and adjust the pH with 2mol / L NaOH solution When the value reaches 9.0-10, sterilize at 121°C for 30 minutes and cool to room temperature, then inoculate Bacillus pasteurii, and cultivate at 30-35°C, 130-135r / min at a constant temperature for 24 hours, to obtain the Bacillus pasteurian bacteria liquid;

[0038] S4: Dilute the Bacillus pasteurian bacteria liquid obtained in S3 to 4-6×10 with distilled water 6 Individual / mL and take 2 parts by weight;

[0039] S5: At 30-35°C, add 60 parts of recycled aggregate, 1 part of urea, 1 part of calcium nitrate, ...

Embodiment 2

[0043] S1: Mechanically crush and activate the recycled aggregate, and screen out the aggregate with a particle size of 5-15mm;

[0044] S2: remove the dust on the surface of the aggregate obtained in S1 by air blowing;

[0045]S3: Prepare Bacillus pasteurian culture medium, add 5g of yeast powder, 5g of trimethylglycine, 10g of tryptone, 5g of ammonium sulfate, 2g of glutamic acid, and 10g of urea into 1L of ultrapure water, and adjust the pH with 2mol / L NaOH solution When the value reaches 9.0-10, sterilize at 121°C for 30 minutes and cool to room temperature, then inoculate Bacillus pasteurii, and cultivate at 30-35°C, 130-135r / min at a constant temperature for 24 hours, to obtain the Bacillus pasteurian bacteria liquid;

[0046] S4: Dilute the Bacillus pasteurian bacteria liquid obtained in S3 to 4-6×10 with distilled water 6 Individual / mL and take 2 parts by weight;

[0047] S5: At 30-35°C, add 60 parts of recycled aggregate, 1 part of urea, 1 part of calcium nitrate, 1...

Embodiment 3

[0051] S1: Mechanically crush and activate the recycled aggregate, and screen out the aggregate with a particle size of 5-15mm;

[0052] S2: remove the dust on the surface of the aggregate obtained in S1 by air blowing;

[0053] S3: Prepare Bacillus pasteurian culture medium, add 5g of yeast powder, 5g of trimethylglycine, 10g of tryptone, 5g of ammonium sulfate, 2g of glutamic acid, and 10g of urea into 1L of ultrapure water, and adjust the pH with 2mol / L NaOH solution When the value reaches 9.0-10, sterilize at 121°C for 30 minutes and cool to room temperature, then inoculate Bacillus pasteurii, and cultivate at 30-35°C, 130-135r / min at a constant temperature for 24 hours, to obtain the Bacillus pasteurian bacteria liquid;

[0054] S4: Dilute the Bacillus pasteurian bacteria liquid obtained in S3 to 4-6×10 with distilled water 6 Individual / mL and take 2 parts by weight;

[0055] S5: At 30-35°C, add 60 parts of recycled aggregate, 1 part of urea, 1 part of calcium nitrate, ...

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Abstract

The invention discloses recycled concrete and a preparation method thereof. The recycled concrete is prepared from the following raw materials in parts by mass: 60 to 80 parts of recycled aggregate, 9to 12 parts of artificial fiber, 1 to 2 parts of water reducing agent, 15 to 20 parts of water, 30 to 35 parts of sand, 20 to 30 parts of gelatinizing agent, 1 to 2 parts of urea, 1 to 2 parts of calcium nitrate and 2 to 3 parts of bacillus pasteurii suspension with the concentration of 4 to 6 * 10 < 6 > / mL. The preparation method comprises the following steps: mechanical crushing, airflow blowing, bacillus pasteurii mineralization deposition, konjac powder coating and raw material mixing. The recycled concrete can be used for construction and has the advantages of being good in compressive strength and low in water absorption rate; in addition, the preparation method disclosed by the invention has the advantage of easiness in production.

Description

technical field [0001] The invention relates to the concrete field, more specifically, it relates to a recycled concrete and a preparation method thereof. Background technique [0002] With the development of society, there are more and more buildings and construction projects of all kinds. However, with the transformation of the city, a large number of abandoned buildings in the city are caused. But also spend a lot of manpower and material resources. With the deepening of the environmental protection concept of energy saving, emission reduction and resource recycling, the recycling of waste concrete has become the focus of research on the recycling of construction waste at home and abroad. [0003] Recycled concrete means that waste concrete blocks are crushed, cleaned and graded, mixed with gradation in a certain proportion, partially or completely replaced by natural aggregates (mainly coarse aggregates) such as sand and gravel, and then added with cement, water, etc. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B20/10C12N1/20C12R1/07
CPCC04B20/10C04B20/1018C04B20/1048C04B20/107C04B28/00C04B2111/00017C12N1/20C04B7/24C04B14/06C04B18/16C04B2103/302
Inventor 张栋张勇
Owner 陕西百固建材有限公司
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