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Regenerated coarse aggregate modifier as well as raw material composition, preparation method and application thereof

A technology of regenerated coarse aggregate and modifier, applied in the field of concrete, which can solve the problems of mismatching void size, easy agglomeration or precipitation, large specific surface area of ​​nano powder, etc., achieve high matching degree, improve dispersion performance, and slump effect of satisfaction

Active Publication Date: 2022-08-09
北京新桥技术发展有限公司
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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 overcome the mismatch between the particle size of the recycled coarse aggregate modifier and the gap size of the mortar attached to the recycled aggregate in the prior art, and the inability to fully enter the internal void of the mortar; The specific surface area of ​​the powder is large, it is difficult to disperse, it is insoluble in water, it is easy to agglomerate or precipitate in water and other defects, and to provide a regenerated coarse aggregate modifier, its raw material composition, preparation method and application

Method used

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  • Regenerated coarse aggregate modifier as well as raw material composition, preparation method and application thereof
  • Regenerated coarse aggregate modifier as well as raw material composition, preparation method and application thereof
  • Regenerated coarse aggregate modifier as well as raw material composition, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0063] Step 1: A nanopowder consisting of 600 parts of calcium carbonate with a median particle size of 10 nm, 150 parts of silicon dioxide with a median particle size of 150 nm and 150 parts of silicon nitride with a median particle size of 500 nm is mixed with 900 parts of water 1min to prepare a suspension;

[0064] Step 2: Mix 1000 parts of sodium dodecyl sulfonate, 250 parts of sodium polyacrylate and 85 parts of polysorbate-80 with 1335 parts of water for 2 minutes to prepare an aqueous solution of dispersant; The suspension was mixed for 1 min, ultrasonically treated for 5 min, and the ultrasonic power was 20-25 kHz to obtain a regenerated coarse aggregate modifier.

Embodiment 2

[0066] Preparation method of C30 recycled concrete:

[0067] Mix 400 parts of C30 regenerated coarse aggregate with a median particle size of 5 to 31.5 mm with 20 parts of the regenerated coarse aggregate modifier prepared in Example 1, stir for 90 s, and let stand for 10 min to obtain modified C30 regenerated coarse aggregate. aggregate;

[0068] Mix 400 parts of modified C30 recycled coarse aggregate with 350 parts of cement, 750 parts of river sand and 800 parts of primary coarse aggregate, stir for 60s, and then mix with 150 parts of water and 3.5 parts of water reducing agent for 90s to obtain C30 recycled concrete .

[0069] Preparation method of C50 recycled concrete:

[0070] Mix 300 parts of C50 regenerated coarse aggregate with a median particle size of 5 to 20 mm with 15 parts of the regenerated coarse aggregate modifier prepared in Example 1, stir for 90 s, and let stand for 10 min to obtain modified C50 regenerated coarse aggregate. material;

[0071] Mix 300 ...

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Abstract

The invention discloses a regenerated coarse aggregate modifier as well as a raw material composition, a preparation method and application thereof. The nano powder comprises the following components in parts by weight: 600 parts of calcium carbonate with a median particle size of 5 to 20 nm, 100 to 200 parts of silicon dioxide with a median particle size of 100 to 200 nm and 100 to 200 parts of silicon nitride with a median particle size of 200 to 500 nm. The prepared regenerated coarse aggregate modifier adopts the nano powder with a specific formula and gradient particle size, and the nano powder has high matching degree with the gap size of mortar, so that the nano powder can fill gaps of the regenerated coarse aggregate as much as possible, and the water absorption rate of the modified regenerated coarse aggregate can be reduced to 2% or below; meanwhile, the dispersing performance of the nano powder in water can be greatly improved by selecting a specific type of composite dispersing agent; the slump of recycled concrete prepared from the recycled coarse aggregate modifier meets the engineering requirements during pouring.

Description

technical field [0001] The invention belongs to the technical field of concrete, and in particular relates to a regenerated coarse aggregate modifier, a raw material composition thereof, a preparation method and an application thereof. Background technique [0002] The water absorption rate of recycled coarse aggregate is several times that of primary coarse aggregate. Taking 24h water absorption rate as an example, the water absorption rate of primary coarse aggregate is generally less than 1%, while the water absorption rate of recycled coarse aggregate is generally 4%~8%. In between, the slump loss of concrete will be too large and construction cannot be carried out. In order to reduce the water absorption rate of recycled coarse aggregate, the pore blocking method is used to study the modifier of recycled coarse aggregate at home and abroad, and the materials involved are nano-SiO 2 , Nano-CaCO 3 , Nano-CaHCO 3 etc., the nano powder is mixed into a solution, and the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/28C04B28/02
CPCC04B40/0039C04B28/02C04B14/28C04B14/06C04B14/328C04B24/16C04B24/26C04B24/283C04B18/16C04B2103/302Y02W30/91
Inventor 于蕾刘兆磊王志王学光米轶轩张国庆
Owner 北京新桥技术发展有限公司