Recycled concrete coarse aggregate modified processing method

A technology of recycled concrete and recycled coarse aggregates, applied in the field of building materials, can solve the problems of low bulk density affecting aggregate gradation, etc., and achieve the effects of improving aggregate grading, increasing compressive strength and sufficient cement hydration.

Inactive Publication Date: 2010-07-07
SHENYANG JIANZHU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the low bulk density affects the gradation of the aggregate

Method used

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  • Recycled concrete coarse aggregate modified processing method
  • Recycled concrete coarse aggregate modified processing method
  • Recycled concrete coarse aggregate modified processing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Raw material backup:

[0013] Regenerated coarse aggregate comes from demolition waste concrete, after crushing, cleaning and grading, the selected particle size is 5-10mm. The cement is Gongyuan brand P.S32.5 slag portland cement.

[0014] Modification treatment method:

[0015] According to the three situations of water-cement ratio of 0.38, 0.40, 0.42, adjust the cement slurry, add 0.2% polycarboxylate high-efficiency water reducer relative to the cement quality, first mix the water reducer and water thoroughly, and then pour it into the prepared cement , fully mix the two, and then put the spare recycled coarse aggregate into the mixer, mix it with the cement slurry added with the water reducing agent under the condition of stirring, make it fully contact with the cement slurry, and then soak for 30-35 Minutes, the modified recycled coarse aggregate is obtained.

[0016] The regenerated coarse aggregate of the above-mentioned modified treatment is filtered out wi...

Embodiment 2

[0038] The recycled coarse aggregate comes from demolition waste concrete whose model is above C30. After crushing, cleaning and grading, the selected particle size is 10-20mm.

[0039] Cement is 325 # Model above 425 # 、525 # .

[0040] Modification treatment method:

[0041] Adjust the above-mentioned cement so that the water-cement ratio is 0.36, and then add 0.6% of its weight molasses water-reducer to the cement with the adjusted water-cement ratio. Fully soak the aggregate, mix the two fully, then put the spare recycled coarse aggregate into the mixer, mix it with the cement added with the water reducer under the condition of stirring, make it fully contact with the cement slurry, and then soak After 35-40 minutes, the modified recycled coarse aggregate is obtained.

Embodiment 3

[0043] The recycled coarse aggregate comes from demolition waste concrete whose model is above C60. After crushing, cleaning and grading, the selected particle size is 10-20mm.

[0044] Cement is 425 # Model above 525 # .

[0045] Modification treatment method:

[0046] Adjust the above cement to have a water-cement ratio of 0.46, then add 0.4% lignin water reducer by weight to the cement with adjusted water-cement ratio, fully mix the two, and then put the spare recycled coarse aggregate into Mixer, under the condition of stirring, mix with cement added with water reducing agent, make it fully contact with cement slurry, and then soak for 20-30 minutes to obtain modified recycled coarse aggregate.

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Abstract

The invention relates to building material and in particular to a recycled concrete coarse aggregate modified processing method; water reducing agents with weight of 0.1-0.6 percent of cement is added in cement and is uniformly mixed, and then the recycled coarse aggregate is added under the coition that the cement paste is stirred uniformly and is uniformly mixed with the cement paste and is soaked for 20-40minues, and then maintaining is carried out. The crushing index of the modified coarse aggregate is obviously improved, and the measured value can reach specified requirements of standards of regular concrete sand, stone quality and test method (JGJ 52-2006), the water absorption rate is obviously reduced compared with the water absorption rate of the existing recycled coarse aggregate; in addition, the invention improves the stacking density of the recycled aggregate and well improves the aggregate gradation.

Description

technical field [0001] The invention relates to building materials, in particular to a method for modifying recycled concrete coarse aggregate. Background technique [0002] In the past three decades, with the acceleration of urbanization worldwide, concrete, as the largest man-made material, has taken up natural resources and caused negative impacts on the environment, which has also sparked discussions on sustainable development. At present, the annual production of concrete in the world is about 28×10 8 mm 3 . China's annual concrete output accounts for 45% of the world's total, reaching 13×10 8 ~14×10 8 mm 3 , it is expected that in 2010 it may exceed 22×10 8 mm 3 . Among concrete raw materials, coarse and fine aggregates account for about 75% of the total amount of concrete. According to this calculation: the whole world needs about 21×10 coarse and fine aggregates every year. 8 mm 3 , of which China needs about 10×10 8 mm 3 , may exceed 16×10 after 5 years...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B20/10C04B18/16
CPCC04B20/1077C04B18/021C04B18/167Y02W30/91C04B20/0076C04B20/02C04B20/026C04B2103/302
Inventor 周静海李连君于洪洋姜宏彭丙杰何海进江涛张晓霞刘飞宋阳郭凯
Owner SHENYANG JIANZHU UNIVERSITY
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