A kind of recycled concrete and preparation method

A technology of recycled concrete and recycled coarse aggregate, applied in the field of concrete, can solve the problems of large crushing index, poor durability, large porosity, etc., and achieve the effects of saving resources, improving coupling effect, and uniform compressive strength

Active Publication Date: 2022-08-09
深圳市汇基砼混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to the small cracks inside the aggregate during the crushing process of the recycled aggregate, and the surface of the recycled aggregate generally adheres to a part of the old mortar, compared with the natural aggregate, the recycled aggregate has a large crushing index and a high water absorption rate. , large porosity, low apparent density and other characteristics, resulting in low strength and poor durability of recycled concrete

Method used

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  • A kind of recycled concrete and preparation method
  • A kind of recycled concrete and preparation method
  • A kind of recycled concrete and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] A preparation method of recycled concrete:

[0072] Divide 65kg of KH-550 silane coupling agent and 74kg of hydroxypropyl methylcellulose into two equal parts, and half of the silane coupling agent and hydroxypropyl methylcellulose are poured into a concrete mixer, 631kg of crushed stone, 157kg of regeneration The fine aggregate was stirred for 1 hour; at the same time, the other half of the silane coupling agent and hydroxypropyl methyl cellulose was poured into another concrete mixer and mixed with 426kg of regenerated coarse aggregate and 655kg of river sand for 1 hour; after the stirring, the first The mixture is mixed with the second mixture, and together with 190 kg of cement, 173 kg of water, and 6.7 kg of water reducing agent are poured into a concrete mixer for mixing and stirring for 10 minutes to obtain recycled concrete.

Embodiment 2

[0074] Divide 70kg of KH-550 silane coupling agent and 82kg of hydroxypropyl methylcellulose into two equal parts, and pour half of the silane coupling agent and hydroxypropyl methylcellulose into a concrete mixer, 852kg of crushed stone, 328kg of regeneration The fine aggregate was stirred for 2 hours; at the same time, the other half of the silane coupling agent and hydroxypropyl methyl cellulose was poured into another concrete mixer and mixed with 210kg of recycled coarse aggregate and 481kg of river sand for 2 hours; after the stirring, the first The mixture was mixed with the second mixture, and together with 230 kg of cement, 159 kg of water, and 7.7 kg of water reducing agent were poured into a concrete mixer and mixed for 10 minutes to obtain recycled concrete.

Embodiment 3

[0076] Divide 66.5kg of KH-550 silane coupling agent and 78.5kg of hydroxypropyl methylcellulose into two equal parts, and half of the silane coupling agent and hydroxypropyl methylcellulose are poured into a concrete mixer and 744kg of crushed stone, 238kg of regenerated fine aggregate was stirred for 1.5h; at the same time, the other half of the silane coupling agent and hydroxypropyl methyl cellulose was poured into another concrete mixer, 322kg of regenerated coarse aggregate and 563kg of river sand were stirred for 1.5h; , the first mixture and the second mixture are mixed, and together with 203kg of cement, 165kg of water, and 7kg of water reducing agent are poured into a concrete mixer for mixing and stirring for 10 minutes to obtain recycled concrete.

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Abstract

The present application relates to the field of concrete, and specifically discloses a recycled concrete and a preparation method. A recycled concrete comprises cement; water; crushed stone; river sand; recycled coarse aggregate; recycled fine aggregate; fly ash; water reducing agent; silane coupling agent; cellulose ether; its preparation method comprises the following steps : (1): Divide silane coupling agent and cellulose ether into two equal parts; (2): Pour half part of silane coupling agent and half part of cellulose ether into crushed stone and regenerated fine aggregate, mix 1h~2h becomes the first mixture; (3): Pour half of the silane coupling agent and half of the cellulose ether into the regenerated coarse aggregate and river sand, and mix for 1h~2h to become the second mixture; (4): The recycled concrete is prepared by mixing the first mixture and the second mixture with cement, fly ash, water, and a water reducing agent. The recycled concrete of the present application has the advantages of similar strength and durability to ordinary concrete, and saves construction resources.

Description

technical field [0001] The present application relates to the field of concrete, and more particularly, to a recycled concrete and a preparation method. Background technique [0002] With the development of society, the effective utilization of construction waste has become a new topic, in which waste concrete accounts for a large part of construction waste. All natural aggregates such as sand and gravel are replaced, and cement, water, etc. are added to form new concrete. The construction waste formed by waste building concrete is crushed to form recycled aggregate for recycling, which not only treats a large amount of construction waste, but also Save building materials, energy saving and environmental protection. [0003] The waste concrete is processed into recycled aggregate. The recycled aggregate is generally divided into recycled coarse aggregate and recycled fine aggregate according to the particle size, while natural aggregate is also divided into crushed stone wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B14/02C04B14/06C04B18/167C04B18/08C04B24/383C04B24/40C04B2103/302C04B2103/0068C04B24/281Y02W30/91
Inventor 王厚义刘光宁王武卫牟联亚
Owner 深圳市汇基砼混凝土有限公司
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