Method for activating waste concrete micro powder

A technology of waste concrete and activation method, which is applied in the field of waste concrete micropowder activation, can solve the problems of waste of resources, inability to use it, large cultivated land, etc., and achieve the effect of improving the activity.

Inactive Publication Date: 2013-03-27
NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] With the acceleration of my country's urbanization and industrialization, many buildings and structures have been demolished for redesign and construction, and the largest part of these buildings and structures is concrete. The traditional method is to stack or Landfill not only occupies a large amount of cultivated land but also pollutes the environment. In addition, waste concrete contains a large amount of aggregate, which causes waste of resources when discarded.
In order to overcome the above shortcomings, some people began to recycle waste concrete. The existing method of recycling waste concrete is mainly to use its aggregates, and about 25% of waste concrete micropowder will be produced in the process of producing recycled concrete aggregates, which cannot be used.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Mix waste concrete micropowder and powdered sodium silicate and heat it to 300°C and keep it warm for 2 hours. The weight of powdered sodium silicate added is 2% of the weight of waste concrete micropowder, and then cooled to room temperature; then mixed with desulfurized gypsum and admixture Mix and grind for 15-60 minutes, the weight of desulfurized gypsum is 5% of the weight of the mixture of waste concrete powder and powdery sodium silicate, and the weight of admixture is 2% of the weight of the mixture of waste concrete powder and powdery sodium silicate. After grinding at room temperature, the fineness specific surface area is greater than 450 m 2 / kg powder.

[0017] This product can be used as a new type of concrete active admixture, with an activity index greater than 95% in 28 days;

[0018] Prepare samples for the present embodiment without doping and doping below, and the performance comparison of the resulting product:

[0019] Take 450 grams of PO.42.5 o...

Embodiment 2

[0025] Mix waste concrete micropowder and powdery sodium silicate and heat it to 300°C and keep it warm for 1.5 hours. The weight of powdery sodium silicate added is 1% of the weight of waste concrete micropowder, then cool down to room temperature; then add desulfurized gypsum and admixture Mix and grind for 15-60 minutes, the weight of desulfurized gypsum is 3% of the weight of the mixture of waste concrete powder and powdery sodium silicate, the weight of admixture is 3% of the weight of the mixture of waste concrete powder and powdery sodium silicate, and the weight of powder After grinding, the fineness specific surface area is greater than 450 m 2 / kg powder.

[0026] This product can be used as a new type of concrete active admixture, with an activity index greater than 95% in 28 days;

[0027] Prepare samples for the present embodiment without doping and doping below, and the performance comparison of the resulting product:

[0028] Take 450 grams of PO.42.5 ordinary...

Embodiment 3

[0034] Mix waste concrete micropowder and powdery sodium silicate and heat it to 300°C and keep it warm for 2 hours. The weight of powdery sodium silicate added is 3% of the weight of waste concrete micropowder, and then cool down to room temperature; then add desulfurized gypsum and admixture Mix and grind for 15 to 60 minutes. The weight of desulfurized gypsum is 3% of the weight of the mixture of waste concrete powder and powdered sodium silicate, and the weight of admixture is 1% of the weight of the mixture of waste concrete powder and powdered sodium silicate. After grinding, the fineness specific surface area is greater than 450 m 2 / kg powder.

[0035] This product can be used as a new type of concrete active admixture, and the 28-day activity index is greater than 95%;

[0036] Prepare samples for the present embodiment without doping and doping below, and the performance comparison of the resulting product:

[0037] Take 450 grams of PO.42.5 ordinary Portland cemen...

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Abstract

The invention relates to a method for activating waste concrete micro powder, comprising the following steps of: (1) mixing waste concrete micro powder and powdered sodium silicate, heating to 250-350 DEG C, preserving heat for 1-2 hours, and decreasing the temperature to room temperature, wherein the weight of the added powdered sodium silicate is 1-3% of that of the added waste concrete micro powder; and (2) mixing the mixture of the waste concrete micro powder and the powdered sodium silicate with desulfurization gypsum and an admixture, grinding for 15-60 minutes to obtain the powder with the fineness and the specific surface area of more than 450m<2> / kg, wherein the weight of the desulfurization gypsum is 1-5% of that of the mixture of the waste concrete micro powder and the powdered sodium silicate, and the weight of the admixture is 1-3% of that of the mixture of the waste concrete micro powder and the powdered sodium silicate. The method can improve the activity of the waste concrete micro powder so that the waste concrete micro powder is fully utilized.

Description

technical field [0001] The invention belongs to the technical field of concrete materials, and in particular relates to a method for activating waste concrete micropowder. Background technique [0002] With the acceleration of my country's urbanization and industrialization, many buildings and structures have been demolished for redesign and construction, and the largest part of these buildings and structures is concrete. The traditional method is to stack or Landfill not only occupies a large amount of cultivated land but also pollutes the environment. In addition, waste concrete contains a large amount of aggregate, which causes waste of resources when discarded. In order to overcome the above shortcomings, some people began to recycle waste concrete. The existing method of recycling waste concrete mainly uses its aggregate, and about 25% of waste concrete micropowder will be produced in the process of producing recycled concrete aggregate, which cannot be used. Contents...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/16
CPCY02W30/91
Inventor 孙家瑛顾昕马小康余楠王作军张敏杰
Owner NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG
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