Preparation method of regenerated concrete

Abstract

The invention discloses a preparation method of regenerated concrete. The provided method can effectively solve the problem of construction waste recovery and reutilization. Moreover, the concrete production period is short, the microbial treatment can effectively reduce the porosity of regenerated aggregate, thus the crushing value and water absorption of aggregate are reduced, the strength of produced regenerated concrete can reach C50, and the properties of regenerated concrete become more stable.

Description

technical field

[0001] The invention belongs to the technical field of concrete material preparation, and in particular relates to a preparation method of recycled concrete. Background technique

[0002] According to relevant statistics, about 35% of waste concrete is discharged in structural engineering in my country, and the rest is waste such as asphalt concrete. According to rough statistics, in my country alone, the waste from demolition of old buildings reaches more than 40 million tons every year, of which the amount of disintegrated old concrete is about 13.6 million tons. The discharge of waste concrete is as many as 4.8 million tons.

[0003] Processing waste concrete into recycled aggregate for the preparation of recycled concrete not only solves the problem of environmental pollution, but also realizes the reuse of resources and reduces the waste of resources and energy. However, compared with natural aggregates, there are a large number of fine cracks inside re...

Examples

Embodiment 1

[0020] Prepare microbial culture medium, adjust the pH value to 7-9 by dropping NaOH solution, sterilize and cool to room temperature, inoculate Bacillus sarcina, add urea solution at the same time, shake culture at 25°C; medium consists of peptone 4g / L. Beef extract 2g / L and deionized water, or composed of soybean peptone 5g / L, casein peptone 15g / L and deionized water; the sterilization conditions are: sterilization at 125°C for 25min ; Bacteria were shaken for 15 hours, and the bacterial cell concentration was 223cell / mL.

[0021] Add regenerated aggregates to the bacterial culture solution and continue shaking culture; the regenerated aggregates are obtained after passing through a 0.075mm standard sieve and washed with water, the particle size is 0.075mm-4.75mm, and the ratio of the bacterial culture solution is 150g: 250mL; regenerated fine bone The material is added to the bacterial solution prior to the mixed solution of calcium source urea, and the oscillation is main...

Embodiment 2

[0028] Prepare microbial culture medium, adjust the pH value to 7-9 by adding NaOH solution dropwise, sterilize and cool to room temperature, inoculate Bacillus sarcina, add urea solution at the same time, shake culture at 37°C; medium consists of peptone 6g / L. Beef extract 4g / L and deionized water, or composed of soybean peptone 5g / L, casein peptone 15g / L and deionized water; the sterilization conditions are: sterilize at 125°C for 25min ; The bacteria were shaken for 20 hours, and the bacterial cell concentration was 625cell / mL.

[0029] Add regenerated aggregates to the bacterial culture solution and continue shaking culture; the regenerated aggregates are obtained after passing through a 0.075mm standard sieve and washing with water, the particle size is 0.075mm-4.75mm, and the ratio of the bacterial culture solution is 150g: 250mL-300g: 250mL ; The regenerated fine aggregate was added to the bacterial solution prior to the mixed solution of calcium source urea, and the o...

technical field

[0001] The invention belongs to the technical field of concrete material preparation, and in particular relates to a preparation method of recycled concrete. Background technique

[0002] According to relevant statistics, about 35% of waste concrete is discharged in structural engineering in my country, and the rest is waste such as asphalt concrete. According to rough statistics, in my country alone, the waste from demolition of old buildings reaches more than 40 million tons every year, of which the amount of disintegrated old concrete is about 13.6 million tons. The discharge of waste concrete is as many as 4.8 million tons.

[0003] Processing waste concrete into recycled aggregate for the preparation of recycled concrete not only solves the problem of environmental pollution, but also realizes the reuse of resources and reduces the waste of resources and energy. However, compared with natural aggregates, there are a large number of fine cracks inside re...

Examples

Embodiment 1

[0020] Prepare microbial culture medium, adjust the pH value to 7-9 by dropping NaOH solution, sterilize and cool to room temperature, inoculate Bacillus sarcina, add urea solution at the same time, shake culture at 25°C; medium consists of peptone 4g / L. Beef extract 2g / L and deionized water, or composed of soybean peptone 5g / L, casein peptone 15g / L and deionized water; the sterilization conditions are: sterilization at 125°C for 25min ; Bacteria were shaken for 15 hours, and the bacterial cell concentration was 223cell / mL.

[0021] Add regenerated aggregates to the bacterial culture solution and continue shaking culture; the regenerated aggregates are obtained after passing through a 0.075mm standard sieve and washed with water, the particle size is 0.075mm-4.75mm, and the ratio of the bacterial culture solution is 150g: 250mL; regenerated fine bone The material is added to the bacterial solution prior to the mixed solution of calcium source urea, and the oscillation is main...

Embodiment 2

[0028] Prepare microbial culture medium, adjust the pH value to 7-9 by adding NaOH solution dropwise, sterilize and cool to room temperature, inoculate Bacillus sarcina, add urea solution at the same time, shake culture at 37°C; medium consists of peptone 6g / L. Beef extract 4g / L and deionized water, or composed of soybean peptone 5g / L, casein peptone 15g / L and deionized water; the sterilization conditions are: sterilize at 125°C for 25min ; The bacteria were shaken for 20 hours, and the bacterial cell concentration was 625cell / mL.

[0029] Add regenerated aggregates to the bacterial culture solution and continue shaking culture; the regenerated aggregates are obtained after passing through a 0.075mm standard sieve and washing with water, the particle size is 0.075mm-4.75mm, and the ratio of the bacterial culture solution is 150g: 250mL-300g: 250mL ; The regenerated fine aggregate was added to the bacterial solution prior to the mixed solution of calcium source urea, and the o...