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Method for improving performance of concrete aggregate

A concrete aggregate and performance technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve problems such as complex and variable, difficult to control quality, and achieve good results, low cost, and improved performance Effect

Active Publication Date: 2022-08-02
CHINA CONSTR IND & ENERGY ENG GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, waste concrete comes from different industries and different regions, which is complex and changeable, and the quality is difficult to control

Method used

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  • Method for improving performance of concrete aggregate
  • Method for improving performance of concrete aggregate
  • Method for improving performance of concrete aggregate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A method for improving the properties of concrete aggregates, the steps are as follows:

[0020] (1) Add the composite microbial powder, regenerated aggregate, and water to the stirring pot in a ratio of 1:5:5 by mass. The mass ratio of yeast and acetic acid bacteria in the composite microbial powder is 1:1, and the setting is constant. The temperature is 20 °C, the stirring is continued, the stirring speed is 20 r / min, the stirring time is 24 hours, and the regenerated aggregate A is obtained;

[0021] (2) Wash the regenerated aggregate A with deionized water, dry it, and place it and the microbial bacteria powder Bacillus colloid in a vacuum device. The mass ratio of the microbial bacteria powder to the regenerated aggregate A is 1:10, Fill the cracks of the regenerated aggregate with microbial powder under negative pressure to obtain regenerated aggregate B;

[0022] (3) Spray the calcium source calcium chloride solution on the surface of the regenerated aggregate B...

Embodiment 2

[0024] A method for improving the properties of concrete aggregates, the steps are as follows:

[0025] (1) Add the composite microbial powder, regenerated aggregate, and water to the stirring pot in a ratio of 1:8:8 by mass. The mass ratio of yeast and acetobacter in the composite microbial powder is 1:2, and the setting is constant. The temperature is 20 °C, the stirring is continued, the stirring speed is 30 r / min, the stirring time is 48 hours, and the regenerated aggregate A is obtained by standing for 120 hours;

[0026] (2) Wash the regenerated aggregate A with deionized water, dry it, and place it and the microbial powder Bacillus colloid in a vacuum device. The mass ratio of the microbial powder to the regenerated aggregate A is 1:12, Fill the cracks of the regenerated aggregate with microbial powder under negative pressure to obtain regenerated aggregate B;

[0027] (3) Spray the calcium source calcium chloride solution on the surface of the regenerated aggregate B ...

Embodiment 3

[0029] A method for improving the properties of concrete aggregates, the steps are as follows:

[0030] (1) Add the composite microbial powder, regenerated aggregate, and water to the stirring pot in a ratio of 1:10:10 by mass. The mass ratio of yeast and acetic acid bacteria in the composite microbial powder is 1:3, and the composite microorganism For bacteria powder, water, and regenerated aggregate, set the constant temperature to 20°C, continue stirring, the stirring speed is 30 r / min, the stirring time is 40 hours, and the regenerated aggregate A is obtained;

[0031] (2) Wash the regenerated aggregate A with deionized water, dry it, and place it and the microbial powder Bacillus colloid in a vacuum device. The mass ratio of the microbial powder to the regenerated aggregate is 1:15. Fill the cracks of the regenerated aggregate with microbial powder under negative pressure to obtain regenerated aggregate B;

[0032] (3) Spray the calcium source calcium chloride solution o...

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Abstract

The invention discloses a method for improving the performance of concrete aggregate, which comprises the following steps: (1) adding composite microbial powder, recycled aggregate and water into a stirring pot according to a certain proportion, and continuously stirring uniformly; (2) placing the recycled aggregate obtained in the step (1) and another microbial powder in a vacuum device, and filling the cracks of the recycled aggregate with the microbial powder in a negative pressure environment; and (3) spraying a calcium source solution on the surface of the recycled aggregate obtained in the step (2), keeping the surface of the recycled aggregate wet, spraying once every 5-6 hours, and repeating for 3-5 times. Results show that polysaccharide is degraded into micromolecular substances by adopting microorganisms, the micromolecular substances are converted into acidic substances, a mortar layer on the surface of the recycled aggregate is stripped, the water absorption rate of the recycled aggregate is reduced, and the influence of the substances on the setting time and hardening strength of the recycled aggregate concrete is solved; meanwhile, microbial mineralization at crack defects of the recycled aggregate is coupled, and the performance of the recycled aggregate is improved.

Description

technical field [0001] The invention relates to a method for improving the performance of concrete, in particular to a method for improving the performance of concrete aggregates. Background technique [0002] In recent years, with the rapid development of my country's economy and the accelerated construction of large-scale urban infrastructure, the consumption of building materials, especially concrete, has risen rapidly as the preferred material and the largest material. This means a huge consumption of resources such as sand, gravel and cement, and the irreversible damage to the ecological environment will continue to develop. At the same time, with the large-scale infrastructure construction, a large amount of construction waste such as waste concrete is generated. From 2006 to 2014, the construction area of ​​houses in my country's construction industry has grown exponentially, and the amount of construction waste generated from it should also grow exponentially. In 2...

Claims

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Application Information

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IPC IPC(8): C04B20/02C04B18/16
CPCC04B20/023C04B20/02C04B18/16Y02W30/91C04B20/1055C04B2103/0001C04B18/167
Inventor 王安辉詹其伟张艳芳倪娇娇黄展魏
Owner CHINA CONSTR IND & ENERGY ENG GRP CO LTD
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