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Method for preparing regenerative gel material using waste concrete

A technology of recycled cementitious materials and waste concrete, which is applied in the field of building materials and can solve the problems of lack of effective recycling of mortar

Inactive Publication Date: 2005-12-21
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a lack of effective recycling of mortar containing fine aggregates, hydration products, unhydrated cement, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0007] A method for preparing recycled cementitious materials by using waste concrete, comprising the following steps: 1), demolition and construction of buildings to produce a large amount of waste concrete, most of which have original strength grades of C30, collect the waste concrete, break the waste concrete, And the coarse aggregate therein is separated from the mortar; 2), the separated mortar is crushed into particles with a particle size of 10mm by a jaw crusher, and then ground to a specific surface area of ​​350m with a ball mill 2 / kg of powder; 3), the ground powder is homogenized with a mixer and calcined in a small kiln, calcined at a temperature of 400°C for 2 hours, then quenched to room temperature by wind, and again with a mixer The recycled gelling material product is obtained after homogenization by the feeder.

[0008]

Preface

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cement

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This product

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Embodiment 2

[0017] A method for preparing recycled cementitious materials by using waste concrete, comprising the following steps: 1), demolition and construction of engineering structures, producing a large amount of waste concrete, most of which have original strength grades of C50, collecting the waste concrete, breaking the waste concrete, And the coarse aggregate therein is separated from the mortar; 2), the separated mortar is crushed into particles with a particle size of 9mm with a jaw crusher, and then ground into a specific surface area of ​​400m with a ball mill 2 / kg of powder; 3), the ground powder is homogenized with a mixer and calcined in a small kiln, calcined at a temperature of 850°C for 2 hours, then quenched to room temperature by wind, and then mixed again The recycled gelling material product is obtained after homogenization by the feeder.

[0018]

Preface

No

water

(kg / m 3 )

cement

(kg / m 3 )

This produ...

Embodiment 3

[0027] A method for preparing recycled cementitious materials by using waste concrete, comprising the following steps: 1), breaking the waste concrete, and separating the coarse aggregate therein from the mortar; 2), breaking the separated mortar into 5mm particle size Granules, and then use a mill to grind to a specific surface area of ​​300m 2 / kg of powder: 3) After the ground powder is homogenized by a mixer, it is calcined at a temperature of 900°C for 1.5 hours, then quenched by wind to room temperature, and homogenized by a mixer again to obtain Recycled cementitious material products.

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PUM

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Abstract

The invention discloses a preparation technique of regenerating coagulation material with waste concrete, which features following steps: 1, crush waste concrete and separate the rough material with sand pulp; 2, crush the separated sand pulp into powder of particle size smaller or equal than 10 millimeter and then grind into powder of specify area larger than 300 square meter per kilogram; 3, sinter the grinded powder after blended in blending machine at 400-900 deg.C for 1.5 to 2.5 hours, fast cool down to room temperature with blowing air, blend again in blending machine to get the product. The regenerating coagulation material can be blending material in concrete production.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a method for preparing recycled cementitious materials by using waste concrete. Background technique [0002] Every year, a large number of old houses and old engineering structures are demolished and rebuilt or destroyed, resulting in an astonishing amount of construction waste, a considerable part of which is waste concrete, which takes up a lot of valuable land resources, and the recycling rate is also very low . In fact, waste concrete is mainly composed of coarse aggregate and mortar. Someone separates the coarse aggregate from the mortar and uses it again to produce concrete. However, there is a lack of effective recycling of mortar containing fine aggregates, hydration products, and unhydrated cement. Contents of the invention [0003] In view of the above problems, the purpose of the present invention is to provide a method of using waste concrete to pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01C19/10
CPCY02W30/91
Inventor 胡曙光丁庆军何永佳吕林女吴静
Owner WUHAN UNIV OF TECH
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