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Comprehensive utilization method of waste concrete

A waste concrete and concrete technology, applied in chemical instruments and methods, applications, household appliances, etc., can solve problems such as troublesome processes, low particle surface quality, large impact on water consumption and constructability of concrete mixtures, and achieve reduction Consumption, the effect of solving environmental pollution problems

Inactive Publication Date: 2010-03-10
SHANDONG JIANZHU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the recycled aggregate prepared by this method can only be used for the preparation of low-grade concrete because of its low particle surface quality, which has a great impact on the water consumption and workability of the concrete mixture.
In addition, the utilization of waste concrete is to prepare regenerated cement (seeing the Chinese patent technology whose publication number is CN1857782A and publication number CN101215114A). After the method adopts the method of calcination and mechanical separation to separate the regenerated aggregate, the cement slurry is used to prepare regenerated cement. The use of waste concrete is classified and used separately, and the process is troublesome
No application of waste concrete in autoclaved bricks and aerated concrete blocks has been found so far

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] A comprehensive utilization method of waste concrete:

[0020] The waste concrete was calcined at 900°C for 10 hours, then cooled with the furnace, crushed on the jaw crusher, and then ball milled to make the burned waste concrete powder reach a certain fineness, and the sieve residue on a 60-mesh standard sieve was not more than 5% (wt %)until. Add 30 parts of fly ash and 5 parts of cement for every 100 parts by weight of the ground waste concrete powder. After mixing evenly, add an appropriate amount of tap water and stir for 10 minutes. Concrete load-bearing masonry bricks were prepared by autoclaving for 1 day in saturated steam at 175 °C and 0.8 MPa pressure. The prepared load-bearing masonry brick has a compressive strength greater than 30MPa, and other indexes all reach the standard of MU30 fly ash brick. The semi-dry press forming and autoclave curing of load-bearing masonry bricks can also be realized by any existing technology.

Embodiment 2

[0022] A comprehensive utilization method of waste concrete:

[0023] The waste concrete is calcined at 950°C for 8 hours, then air-cooled, crushed on the jaw crusher, and then ground to make the burned waste concrete powder reach a certain fineness, and the sieve residue on a 60-mesh standard sieve is no more than 5% (wt%) . Add 30 parts of fly ash and 5 parts of cement for every 100 parts by weight of the ground waste concrete powder. After mixing evenly, add an appropriate amount of tap water. After stirring for 20 minutes, it is molded by unidirectional pressure on a press with a molding pressure of 10.0 MPa. Concrete load-bearing masonry bricks were prepared by autoclaving in saturated steam at 180 °C and 1.0 MPa pressure for 1 day. The prepared load-bearing masonry bricks have a compressive strength greater than 30MPa, and other indicators all reach the standard of MU30 fly ash bricks. The semi-dry press forming and autoclave curing of load-bearing masonry bricks can a...

Embodiment 3

[0025] A comprehensive utilization method of waste concrete:

[0026] The waste concrete is calcined at 1000°C for 5 hours, then cooled with the furnace, crushed on the jaw crusher, and then ground to make the waste concrete powder after burning reach a certain fineness, and the sieve residue on a 60-mesh standard sieve is not more than 5% (wt %)until. Add 35 parts of fly ash, 5 parts of cement and 10 parts of sand for every 100 parts by weight of the ground waste concrete powder. After mixing evenly, add an appropriate amount of tap water. After stirring for 20 minutes, it is molded by unidirectional pressure on a press with a molding pressure of 10.0 MPa, and then autoclaved for 1 day in saturated steam at 190 °C and 1.3 MPa pressure to prepare concrete load-bearing masonry bricks. The prepared load-bearing masonry bricks have a compressive strength greater than 30MPa, and other indicators all reach the standard of MU30 fly ash bricks. The semi-dry press forming and autocl...

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Abstract

The invention discloses a comprehensive utilization method of waste concrete, which belongs to the technical field of building materials. The method comprises the following steps: calcining waste concrete at high temperature and then grinding and smashing the waste concrete; when the concrete reaches certain fineness, adding additive agents such as flyash, sand, a small amount of water, and the like to carry out semi-dry pressing; preparing load-bearing blocks by steam pressure curing; or adding additive agents such as the flyash, cement, aluminum powder paste, and the like, stirring and pouring the materials into moulds to mold and preparing aerated concrete blocks through steam pressure curing after foaming. The total additive amount of the waste concrete and the flyash is more than 90 percent, thereby greatly reducing the dependence on limited mineral resources, and moreover, the waste concrete is utilized 100 percent at a time without respective utilization in grades.

Description

technical field [0001] The invention relates to a method for comprehensive utilization of waste concrete, in particular to a method for preparing a new type of wall material by using waste concrete as a main raw material, and belongs to the technical field of building materials. Background technique [0002] Due to the rapid development of the construction industry, the amount of waste concrete demolished every year, waste concrete produced by new buildings, and waste concrete discharged from concrete mixing stations and prefabricated component factories is huge. Such a huge amount of emissions not only requires staggering processing costs, but also takes up a lot of storage space, pollutes the environment, and wastes cultivated land. It has become a major public hazard in the city, and the environmental problems caused by it are also very prominent. The disposal costs and environmental problems of such a large amount of waste concrete can be imagined. [0003] At the same ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/02C04B28/00B28C5/00E04C1/00C04B18/08C04B18/16
CPCC04B28/02C04B18/023Y02W30/91C04B18/16C04B18/08C04B22/04C04B38/02C04B40/024
Inventor 田清波徐丽娜刘巧玲贾立群胡占彪
Owner SHANDONG JIANZHU UNIV
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