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Method for preparing inorganic mixture by using waste concrete recycled aggregate

A waste concrete and recycled aggregate technology is applied in solid waste management, sustainable waste treatment, climate sustainability, etc. It can solve the problems that natural grading cannot meet the requirements of road inorganic mixtures, increase production costs, etc., and achieve savings The effect of raw material cost, reduction of cement addition ratio, and high value-added utilization

Inactive Publication Date: 2012-12-26
SHOUGANG CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Inorganic mixtures for urban road bases and subbases are an important part of urban road construction. A large amount of recycled aggregate from construction waste can be used, which has broad development prospects. If waste concrete is used as road inorganic mixtures, the following issues need to be paid attention to First, the natural gradation of waste concrete after crushing cannot meet the requirements of road inorganic mixtures, and the coarse aggregate needs to be further finely broken to meet the gradation requirements, which will increase production costs; second, the use range of waste concrete recycled coarse aggregate It is wide and can be used as a raw material for concrete with high added value

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] After crushing and screening the waste concrete from civil building demolition, the recycled aggregates with particle sizes of 0-5mm, 5-10mm and 10-31.5mm are obtained, and then the particle sizes are 0-5mm, 5-10mm and 10- 31.5mm recycled aggregate is mixed uniformly at the ratio of 65%, 10% and 25% to obtain mixed recycled aggregate, and then the above mixed recycled aggregate is mixed with 4.5% cement at a ratio of 95.5%, and then added with water to prepare cement stability Inorganic mixture; the test results show that the 7-day unconfined compressive strength is 3.02MPa, which meets the material requirements of highways, first-class highways, second-class highways and roads below second-class road base and sub-base.

Embodiment 2

[0019] After crushing and screening the waste concrete from civil building demolition, the recycled aggregates with particle sizes of 0-5mm, 5-10mm and 10-31.5mm are obtained, and then the particle sizes are 0-5mm, 5-10mm and 10- 31.5mm recycled aggregate is mixed uniformly at the ratio of 65%, 10% and 25% to obtain mixed recycled aggregate, and then the above mixed recycled aggregate is mixed with 4.0% cement at a ratio of 96%, and then added with water to prepare cement stability Inorganic mixture; the test results show that the 7-day unconfined compressive strength is 2.58MPa, which meets the requirements for the base material of secondary roads and below secondary roads, as well as the subbase materials of expressways, primary roads, secondary roads and roads below secondary roads Require.

Embodiment 3

[0021] After crushing and screening the waste concrete from industrial building demolition, the recycled aggregates with particle sizes of 0-5mm, 5-10mm and 10-31.5mm are obtained, and then the particle sizes are 0-5mm, 5-10mm and 10- The 31.5mm recycled aggregate is mixed uniformly at a ratio of 70%, 8% and 22% to obtain a mixed recycled aggregate, and then the above mixed recycled aggregate is mixed with 4% cement at a ratio of 96%, and then added with water to prepare cement stability Inorganic mixture; the test results show that the 7-day unconfined compressive strength is 3.71MPa, which meets the material requirements of expressways, first-class highways, second-class highways, and roads below second-class road base and sub-base.

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Abstract

The invention provides a method for preparing inorganic mixture by using waste concrete recycled aggregate. The method comprises mixing, by mass percentage, 65-75% of the recycled aggregate with the grain diameter of 0-5 millimeters, 5-15% of the recycled aggregate with the grain diameter of 5-10 millimeters, and 20-30% of the recycled aggregate with the grain diameter of 10-31.5 millimeters, wherein the recycled aggregate is prepared by crushing waste concrete; and then adding cement to obtain the inorganic mixture, wherein the mass percentage of the mixed aggregate is 95.5-97%, and the mass percentage of the cement is 3-4.5%. The method for preparing the inorganic mixture by using the waste concrete recycled aggregate achieves grading design of the inorganic mixture by combination of the characteristics of the waste concrete aggregate and proportioning design, effectively utilizes part of activity of the waste concrete aggregate, reduces the proportion of the added cement, utilizes a large proportion of fine aggregate raw materials of the waste concrete recycled aggregate, and reduces cost.

Description

technical field [0001] The invention relates to the field of recycling of construction waste, in particular to a method for preparing inorganic mixtures from recycled aggregates of waste concrete. Background technique [0002] With the acceleration of my country's urbanization process, the output of construction waste generated by the demolition and renovation of old buildings is also increasing rapidly. It is estimated that our country will generate hundreds of millions of tons of construction waste in total every year, and the untreated construction waste accumulated over the years will also reach an astonishing billion tons. The output of construction waste is huge, which not only occupies a large amount of land, but also pollutes the environment and affects environmental sanitation. Reasonable disposal and utilization of construction waste not only helps to avoid occupying valuable land around cities and secondary environmental pollution, but also reduces the depletion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/16
CPCY02W30/91
Inventor 岳昌盛马刚平孟立滨梁勇才艳芳刘慧慧王荣李博
Owner SHOUGANG CORPORATION
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