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Cement regeneration technique by activating discarded concrete

A technology for waste concrete and recycled cement, applied in solid waste management, sustainable waste treatment, solid waste removal, etc., can solve problems such as pollution and high energy consumption, achieve simple process, low processing energy consumption, and reduce excessive resource consumption and the effects of environmental pollution

Inactive Publication Date: 2007-07-04
长沙紫宸科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to solve the problems of high energy consumption and serious pollution in the above-mentioned prior art, and to provide a low-energy consumption and large-scale recycling of waste concrete, which has good volume stability, durability and construction performance, and simple process. Waste concrete activation recycled cement and recycled aggregate technology with less investment, resource saving, environmental protection and circular economy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment 1: Take the waste concrete of the Beijing-Zhuhai Expressway. The original cement used is 42.5 grade ordinary cement, and the original concrete label is C30. After coarse crushing and sorting, the crushed and sorted cement stone is added with 6.5% auxiliary materials after heat treatment at 710 ° C. The grinding fineness is 1.9% of 80um sieve, and the output rate of recycled cement is 31.3%. The water requirement of the standard consistency is 22.6%, the initial setting is 3:10, the final setting is 4:45, the compression resistance is 21.4MPa in 3 days, the bending resistance is 4.7MPa, the compression resistance is 47.6MPa in 28 days, the bending resistance is 8.1MPa, and the stability is qualified. The separated regenerated coarse and fine aggregates meet the use requirements of concrete aggregates.

Embodiment 2

[0022] Embodiment 2: Take the abandoned concrete beam slab, the original cement 42.5 grade ordinary cement is used, the cement stone after the heat treatment of 750 ℃ ​​is added to grind together with 7.5% auxiliary materials, the fineness 80um sieves 3.7%, and the recycled cement production rate is 35.6% %. The standard consistency is 23.2%, the initial setting is 2:55, the final setting is 4:03, the compressive strength is 16.9MPa in 3 days, the bending resistance is 4.5MPa, and the compressive strength is 36.7MPa and 7.1MPa in 28 days. The stability is qualified. The separated recycled aggregate meets the requirements of concrete aggregate.

Embodiment 3

[0023] Embodiment 3: Get the abandoned concrete of the floor, the original cement 32.5 grade, the coarse and fine aggregate is limestone, the cement stone after sorting 900 ℃ of heat treatment, add 9.5% auxiliary material and grind together, 80um fineness sieves remaining 2.9%, The yield of recycled masonry cement is 58%. The standard consistency is 29.7%, the initial setting is 4:30, the final setting is 5:53, the compression resistance is 8.7MPa in 3 days, the compression resistance is 18.9MPa in 7 days, and the compression resistance is 29.6MPa in 28 days. The stability is qualified.

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PUM

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Abstract

The invention relates to a process for regenerating cement with waste concrete, comprising following steps: disintegrating and separating waste concrete, treating at temperature being 550-950 Deg. C, disintegrating, sifting, grinding with addictive until the sifting leaving less than 15% with screen of 80 um; or grinding with addictive, separating, and the fineness of final product being less than 15%; or disintegrating waste concrete, separating, heat treating, grinding with addictive until the sifting leaving less than 15% with screen of 80 um; then getting regenerative cement, and the separated material is regenerative material. The invention is characterized by low energy consumption, large productivity, and good stability of cement volume, durability and workability, simple process, small investment, energy saving and environmental friendly.

Description

technical field [0001] The invention relates to a building material recycling technology, in particular to the technology of recycling and activating waste concrete to manufacture recycled cement and recycled aggregates. Background technique [0002] Cement is an inorganic gelling material produced by "two grindings and one burning" of raw materials such as limestone and clay. The production of one ton of cement clinker consumes about 1.1 tons of limestone, 0.18 tons of clay, and 0.14 tons of standard coal, and emits about 1 ton of CO 2 and other air pollutants. my country is a developing country with a large population, a weak foundation, and relatively scarce resources. A large amount of cement is needed for infrastructure construction, and the cement consumption accounts for 40% of the world. In 2004, the national cement output reached 93.36 million tons. It is estimated that the total cement output in 2005 will be Breakthrough 10×10 8 Ton. The production of cement con...

Claims

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Application Information

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IPC IPC(8): C04B18/04C04B18/16C04B20/02B09B3/00
CPCY02W30/91
Inventor 尹小林
Owner 长沙紫宸科技开发有限公司
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