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

A technology of active micropowder and waste brick powder, which is applied in the field of building materials, can solve the problems of unusable, waste bricks with many pores, and unsuitable recycled aggregates, etc., and achieve the effects of reducing cement consumption, high-efficiency activation, and remarkable modification effect

Inactive Publication Date: 2015-05-06
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

[0003] At present, the current resource utilization of construction waste is very single. The waste concrete can be made into recycled aggregates for the production of recycled concrete, recycled mortar, recycled wall materials, etc., while the waste bricks in construction waste have many pores and large water absorption. , not suitable for the preparation of recycled aggregates and cannot be used

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0014] The waste bricks are dried and broken into particles of 0-3 mm, ground for 15-30 minutes, and a composite activator is added and fully mixed to prepare the waste brick superfine regenerated active micropowder. The dosage of the composite activator is 2% of the mass of the waste brick powder, and the contents of quicklime, hemihydrate desulfurized gypsum and dihydrate desulfurized gypsum are respectively 25wt%, 50wt% and 25wt%.

[0015] The specific surface area of ​​the waste brick ultrafine regenerated active micropowder thus prepared reaches 610m 2 / kg, the median diameter D50 of the particle size distribution is 14 μm, and the D90 is 31 μm.

[0016] The superfine regenerated active micropowder of waste bricks is mixed into cement mortar as a concrete admixture (30%), and the concrete admixture is determined with reference to GB / T 1596-2005 "Fly Ash Used in Cement and Concrete". Compound Activity Index. Table 1 is the comparison of the activity index of the concrete...

Embodiment 2

[0021] The waste bricks are dried and broken into particles of 0-3 mm, ground for 15-30 minutes, and a composite activator is added and fully mixed to prepare the waste brick superfine regenerated active micropowder. The dosage of the composite activator is 2.5% of the mass of the waste brick powder, and the contents of quicklime, hemihydrate desulfurized gypsum and dihydrate desulfurized gypsum are respectively 40wt%, 20wt% and 40wt%.

[0022] The specific surface area of ​​the waste brick ultrafine regenerated active micropowder thus prepared reaches 605m 2 / kg, the median diameter D50 of the particle size distribution is 19 μm, and the D90 is 40 μm.

[0023] The superfine regenerated active micropowder of waste bricks is mixed into cement mortar as a concrete admixture (30%), and the concrete admixture is determined with reference to GB / T 1596-2005 "Fly Ash Used in Cement and Concrete". Compound Activity Index. Table 2 is the comparison of the activity index of the concre...

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Abstract

The invention discloses a waste brick superfine regenerated active micro-powder and a preparation method thereof. The micro-powder has a specific surface area of more than 600m<2> / kg and a 28d activity index of more than 70%, and can be used as a mortar and concrete admixture. The micro-powder is prepared by taking waste bricks, which have grain diameters of about 3-10cm and are selected from the building waste generated during a house building removal and construction process, as raw materials, and processing through grinding and composite chemical excitation processes. According to the micro-powder and the preparation method disclosed by the invention, superfine grinding and efficient activation for the waste bricks are realized, and a utilization mode with high additional value is provided for the waste bricks.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing superfine regenerated active micropowder by using waste bricks. 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 construction waste is...

Claims

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Application Information

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IPC IPC(8): C04B18/16
CPCY02W30/91
Inventor 王琼於林锋方倩倩俞海勇樊俊江
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD
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