Modified recycled concrete and preparation method thereof

A technology for recycling concrete and concrete, applied in the field of building materials, can solve the problems of accumulation of construction waste, poor mechanical properties, lack of resources, etc., and achieve the effect of improving performance, good performance, excellent mechanical performance and durability

Pending Publication Date: 2018-11-02
YOUNGWOO CHEMTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This has brought about two serious problems: one is that a large amount of primitive natural resources such as sand and gravel are consumed, which will lead to resource shortages in the long run; accumulation
The interface is prone to calcium hydroxide enrichment and has a certain orientation, and is porous and poor in mechanical properties

Method used

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  • Modified recycled concrete and preparation method thereof

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Effect test

Embodiment 1

[0027] A modified recycled concrete, comprising the following raw materials in parts by weight: 100 parts of cement, 250 parts of recycled aggregate, 150 parts of sand, 40 parts of water, 6 parts of silica fume, 1.0 parts of nano silicon dioxide, 1.5 parts of water reducer, 1.0 parts of cellulose ether;

[0028] Among them, the recycled aggregate is prepared by the following method: the waste concrete is broken into 5-40mm aggregate, and then the broken aggregate is put into a tube mill without grinding body and stirred at a low speed for 5 minutes at a stirring speed of 15r / min After grinding and sieving the friable cement block in the aggregate, it can be obtained.

[0029] The cement is P.O 52.5 cement with a specific surface area greater than 280m 2 / kg; the specific surface area of ​​nano-silica is 250m 2 / g, the specific surface area of ​​silica fume is 30m 2 / g; the water reducer is a naphthalene-based water reducer; the sand is washed sand with a particle size of 0....

Embodiment 2

[0036] A modified recycled concrete, comprising the following raw materials in parts by weight: 100 parts of cement, 260 parts of recycled aggregate, 165 parts of sand, 45 parts of water, 10 parts of silica fume, 2.5 parts of nano silicon dioxide, 2.5 parts of water reducer, 1.5 parts of cellulose ether;

[0037] Among them, the recycled aggregate is prepared by the following method: crush the discarded concrete into aggregates of 5-40 mm, and then put the crushed aggregates into a tube mill without grinding body and stir for 5 minutes at a low speed, and the stirring speed is 10 r / min After grinding and sieving the friable cement block in the aggregate, it can be obtained.

[0038] The cement is P.O 52.5 cement with a specific surface area greater than 280m 2 / kg; the specific surface area of ​​nano-silica is 300m 2 / g, the specific surface area of ​​silica fume is 30m 2 / g; the water reducer is a polycarboxylate water reducer; the sand is a mixture of washed sand and quar...

Embodiment 3

[0045] A modified recycled concrete, comprising the following raw materials in parts by weight: 100 parts of cement, 235 parts of recycled aggregate, 145 parts of sand, 35 parts of water, 3 parts of silica fume, 0.5 parts of nano silicon dioxide, 0.5 parts of water reducer, 0.5 part of cellulose ether;

[0046]Among them, the recycled aggregate is prepared by the following method: crush the discarded concrete into aggregates of 5-40 mm, and then put the crushed aggregates into a tube mill without grinding body and stir for 5 minutes at a low speed, and the stirring speed is 20 r / min After grinding and sieving the friable cement block in the aggregate, it can be obtained.

[0047] The cement is P.O 52.5 cement with a specific surface area greater than 280m 2 / kg; the specific surface area of ​​nano-silica is 250m 2 / g, the specific surface area of ​​silica fume is 25m 2 / g; the water reducer is polycarboxylate water reducer; the sand is quartz sand with a particle size of 0....

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Abstract

The invention discloses modified recycled concrete and a preparation method thereof. The concrete is prepared from the following raw materials in parts by weight: 100 parts of cement, 235 to 260 partsof recycled aggregate, 145 to 165 parts of sand, 35 to 45 parts of water, 3 to 10 parts of silica fume, 0.5 to 2.5 parts of nano-silica, 0.5 to 2.5 parts of a water reducing agent, and 0.5 to 1.5 parts of cellulose ether. According to the modified recycled concrete and the preparation method thereof, the recycled aggregate is mechanically activated to remove particles and corners which can easilypeel off, so that the performance of the recycled aggregate is improved. Both nano-silica and silica fume have pozzolanic activity, can react with calcium hydroxide produced by cement hydration to form C-S-H gel, and can effectively improve the performance of the recycled aggregate concrete. The raw material components have a synergistic effect, and the obtained concrete has excellent mechanicalproperties and durability.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a modified recycled concrete and a preparation method thereof. technical background [0002] Cement concrete is the most widely used building material in modern times. At the same time, with the construction of cities, a large amount of waste concrete will be produced. This has brought about two serious problems: one is that a large amount of primitive natural resources such as sand and gravel are consumed, which will lead to resource shortages in the long run; accumulation. [0003] Recycled aggregate concrete refers to the aggregate obtained after crushing, high temperature treatment, cleaning and grading of discarded concrete blocks during the production process or after the use stage, and then mixed with a certain proportion and graded to form recycled concrete aggregate. At present, China's high-quality limestone is being depleted day by day, and the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2111/20C04B2201/50C04B18/146C04B18/167C04B14/06C04B14/062C04B2103/302C04B24/383
Inventor 王义
Owner YOUNGWOO CHEMTECH
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