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Waste concrete superfine regenerated active micro-powder and preparation method thereof

A waste concrete and active micropowder technology, applied in the field of building materials, can solve the problems of high water content, low utilization rate, high water absorption rate, etc., achieve the effect of reducing cement consumption, significant modification effect, and high value-added utilization

Active Publication Date: 2013-12-25
SHANGHAI RES INST OF BUILDING SCI CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the waste with small particle size (0-5mm) produced in the production process of recycled aggregate has a low utilization rate due to high moisture content and high water absorption rate.

Method used

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  • Waste concrete superfine regenerated active micro-powder and preparation method thereof
  • Waste concrete superfine regenerated active micro-powder and preparation method thereof
  • Waste concrete superfine regenerated active micro-powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The waste concrete raw materials are dried and ball milled for 15 minutes. Glycerol, triisopropanolamine and water are mixed in a certain proportion, and evenly sprayed on the waste concrete powder by spraying. 2.5% of mass. Finely grind the concrete powder mixed with the composite additive for 5 minutes to obtain the desired product.

[0016] Table 1 Composite Additive Ratio

[0017]

[0018] When the concentration of polymer compound in the composite additive is 4wt% (glycerol content 2wt%, triisopropanolamine content 2wt%), the specific surface area of ​​waste concrete ultrafine regenerated active micropowder reaches 793m 2 / kg, 45μm fineness below 1.8%; particle size distribution median diameter D50 is 17-20μm, D90 is 60-65μm. When no composite additive is added, the specific surface area of ​​the obtained concrete ultrafine regenerated active micropowder is 609m 2 / kg.

[0019] Concrete ultrafine recycled active micropowder is mixed into cement mortar as a c...

Embodiment 2

[0023] The waste concrete raw materials are dried and ball-milled for 15 minutes, glycerin, triisopropanolamine and water are mixed in a certain proportion, and evenly sprayed on the waste concrete powder in the form of a spray, and the amount of the compound additive is the mass of the waste concrete powder 2.5%. Finely grind the concrete powder mixed with the composite additive for 5 minutes to obtain the desired product.

[0024] Table 3 Composite Additive Ratio

[0025]

[0026] When the concentration of polymer compound in the composite additive is 10wt% (glycerol content 4wt%, triisopropanolamine content 6wt%), the specific surface area of ​​waste concrete ultrafine regenerated active micropowder reaches 864m 2 / kg, 45μm fineness below 1.8%; particle size distribution median diameter D50 is 17-20μm, D90 is 60-65μm. When no composite additive is added, the specific surface area of ​​the obtained concrete ultrafine regenerated active micropowder is 609m 2 / kg.

[00...

Embodiment 3

[0031] The waste concrete raw materials are dried and ball-milled for 15 minutes, glycerin, triisopropanolamine and water are mixed in a certain proportion, and evenly sprayed on the waste concrete powder in the form of a spray, and the amount of the compound additive is the mass of the waste concrete powder 2.5%. Finely grind the concrete powder mixed with the composite additive for 5 minutes to obtain the desired product.

[0032] Table 5 Composite Additive Ratio

[0033]

[0034] When the concentration of polymer compound in the composite additive is 10wt% (glycerol content 6wt%, triisopropanolamine content 4wt%), the specific surface area of ​​concrete ultrafine regenerative active micropowder reaches 819m 2 / kg, 45μm fineness below 1.8%; particle size distribution median diameter D50 is 17-20μm, D90 is 60-65μm. When no composite additive is added, the specific surface area of ​​the obtained waste concrete ultrafine regenerated active micropowder is 609m 2 / kg.

[0...

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Abstract

The invention discloses a waste concrete superfine regenerated active micro-powder and a preparation method thereof. The specific surface area of the micro-powder is larger than 750m2 / kg, and the 28d activity index of the micro-powder reaches more than 70%. The micro-power can be used as admixture for mortar and concrete. The micro-powder is obtained in a mode that 0-5mm tailing obtained at the time that waste concrete is broken for production of recycled aggregate is used as raw materials, and a rough grinding process and a fine grinding process are conducted. Composite additives are added in the fine grinding process for assisting grinding and modifying. According to the micro-powder and the preparation method thereof, super fine grinding and efficient activity of the waste concrete tailing are realized, and a utilization mode with high value-added is provided for waste concrete.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of using waste concrete to prepare superfine regenerated active micropowder. Background technique [0002] With the continuous acceleration of the urbanization process, the generation and discharge of urban construction waste are increasing day by day. Urban construction waste accounts for a considerable proportion of urban solid waste, about 30% to 40% of the total urban solid waste. The use of open-air stacking or landfill disposal, on the one hand, occupies a large area of ​​cultivated land, on the other hand, it will have a great negative impact on vegetation, human health, and the living environment, causing damage to the ecological environment. Therefore, the safe disposal and comprehensive utilization of construction waste has been paid more and more attention. [0003] At present, the current resource utilization of constructi...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B7/38
CPCY02P40/10Y02P40/121
Inventor 王琼於林锋方倩倩樊钧俞海勇
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD
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