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Method for reinforcing recycled aggregate concrete by changing stirring technology

A technology of recycled aggregate and mixing process, which is applied in the field of building materials, can solve the problems affecting the durability and strength of recycled concrete, and achieve the effect of improving the compressive strength

Inactive Publication Date: 2014-05-28
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These factors not only affect the strength of recycled concrete, but also its durability

Method used

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  • Method for reinforcing recycled aggregate concrete by changing stirring technology
  • Method for reinforcing recycled aggregate concrete by changing stirring technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for changing the mixing process to strengthen recycled aggregate concrete is carried out according to the following steps:

[0032] (1) The solid waste is crushed with a jaw crusher, and then screened to form recycled coarse aggregate that meets the requirements of continuous gradation of 4.75~25mm;

[0033] (2) Mix cement and 50% water, stir for 30s, add recycled coarse aggregate, stir for 30s, then add natural coarse and fine aggregates and stir for 30s, finally add 50% water and stir for 30s, the various materials used in the whole process are Cement 327Kg / m 3 , water 180 Kg / m 3 , coarse aggregate 1208 Kg / m 3 , fine aggregate 651 Kg / m 3 , of which the natural coarse aggregate is 906 Kg / m 3 , recycled coarse aggregate is 302 Kg / m 3 ; The slump of the material is measured to make a test block.

[0034] The performance comparison between the prepared C20-RN25 concrete and the concrete prepared by the conventional mixing method of the same material is show...

Embodiment 2

[0038] A method for changing the mixing process to strengthen recycled aggregate concrete is carried out according to the following steps:

[0039] (1) The solid waste is crushed with a jaw crusher, and then screened to form recycled coarse aggregate that meets the requirements of continuous gradation of 4.75~25mm;

[0040] (2) Mix cement and 50% water, stir for 30s, add recycled coarse aggregate, stir for 30s, then add natural coarse and fine aggregates and stir for 30s, finally add 50% water and stir for 30s, the various materials used in the whole process are cement 327Kg / m 3 , water 180 Kg / m 3 , coarse aggregate 1208 Kg / m 3 , fine aggregate 651 Kg / m 3 , of which the natural coarse aggregate is 604Kg / m 3 , recycled coarse aggregate is 604 Kg / m 3 ; The slump of the material is measured to make a test block.

[0041] The performance comparison between the prepared C20-RN50 concrete and the concrete prepared by the conventional mixing method of the same material is show...

Embodiment 3

[0043] A method for changing the mixing process to strengthen recycled aggregate concrete is carried out according to the following steps:

[0044] (1) The solid waste is crushed with a jaw crusher, and then screened to form recycled coarse aggregate that meets the requirements of continuous gradation of 4.75~25mm;

[0045](2) Mix cement and 50% water, stir for 30s, add recycled coarse aggregate, stir for 30s, then add natural coarse and fine aggregates and stir for 30s, finally add 50% water and stir for 30s, the various materials used in the whole process are cement 327Kg / m 3 , water 180 Kg / m 3 , coarse aggregate 1208 Kg / m 3 , fine aggregate 651 Kg / m 3 , of which the natural coarse aggregate is 0Kg / m 3 , recycled coarse aggregate is 1208 Kg / m 3 ; The slump of the material is measured to make a test block.

[0046] The performance comparison between the prepared C20-RN100 concrete and the concrete prepared by the conventional mixing method of the same material is shown...

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Abstract

The invention discloses a method for reinforcing recycled aggregate concrete by changing a stirring technology, and belongs to the field of building materials. The method comprises the following steps that (1) solid waste is crushed via a jaw crusher, and then sieved and assembled into a recycled coarse aggregate meeting a 4.75-25mm continuous grading requirement; and (2) cement and water with 50% of the total water consumption are mixed and stirred for 30-60s; the recycled coarse aggregate is added and stirred for 30-60s; natural coarse and fine aggregates are added and stirred for 30-60s; the residual 50% of water is added and stirred for 30-60s; the slump of a discharged material is measured; and a test block is prepared. Compared with conventional stirring, the stirring technology adopted by the method can wrap and form low-water-cement-ratio cement mortar on the surface of the recycled coarse aggregate, exerts repair and reinforcing effects on a weak area on the surface of the recycled coarse aggregate, and reinforces interface transition areas among the recycled coarse aggregate, the natural aggregates and the cement mortar, so that the compressive strength of the recycled concrete is improved.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a method for strengthening recycled aggregate concrete by changing a mixing process. Background technique [0002] In our country, with the development of our country's economy, the amount of waste concrete is increasing day by day, and the generation and treatment of waste concrete have caused a great load on the environment. Specifically, it is manifested in the renovation of old houses in large, medium and small cities, the demolition of old buildings, and the construction of new buildings, all of which inevitably produce construction waste. Whether it is the waste concrete removed from old buildings or the waste residue generated during the construction of new buildings, it belongs to urban construction waste. These construction wastes not only affect the urban living environment, but also cause environmental pollution. [0003] At present, the main way to deal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B28/08C04B28/00C04B18/16
CPCY02W30/91
Inventor 崔正龙孙庆巍高红江
Owner LIAONING TECHNICAL UNIVERSITY
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