Recycled concrete with high slump loss resistance and preparation method thereof

A recycled concrete and slump-retaining technology, applied in the field of building materials, can solve the problems of high porosity, high water absorption, and reduced workability, and achieve the effects of improving dispersion performance, increasing slump, and reducing water absorption

Active Publication Date: 2020-04-24
深圳市恒星建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commercial concrete needs a period of transportation and storage time from mixing to pouring, which easily deteriorates the workability of concrete, that is, the loss of slump, and the recycled coarse aggregate is rough due to its rough surface, high porosity, and high water absorption. Compared with ordinary concrete, the workability of recycled concrete is relatively poor, the loss of slump, and the reduction of workability are more significant, which directly affects the practical application of recycled concrete.

Method used

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  • Recycled concrete with high slump loss resistance and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0033] A method for preparing recycled concrete with high slump retention, comprising the steps of:

[0034] S1: Stir 180 parts by weight of cement, 380 parts of modified recycled coarse aggregate, 400 parts of crushed stone, 680 parts of natural sand, 90 parts of fly ash, and 65 parts of mineral powder, and mix evenly;

[0035] The treatment method of modified recycled coarse aggregate is to place the crushed coarse aggregate in a water glass solution with a concentration of 3%, soak for 4 hours, and then add the recycled coarse aggregate to a solution of 8% polyvinyl alcohol with a concentration of Continue soaking in the mixed emulsion of 4% silane emulsion for 8h, the weight ratio of polyvinyl alcohol solution and silane emulsion is 1.0;

[0036] S2: Add 4.2 parts by weight of polycarboxylate superplasticizer and 3.5 parts of slump-retaining enhancer to 156 parts of water, and mix evenly; the slump-retaining enhancer is a mixture of BTC-2 and BTC500, BTC-2 and BTC500 The ...

Embodiment 2

[0039]A method for preparing recycled concrete with high slump retention, comprising the steps of:

[0040] S1: Stir 200 parts by weight of cement, 440 parts of modified recycled coarse aggregate, 450 parts of crushed stone, 750 parts of natural sand, 110 parts of fly ash, and 81 parts of mineral powder, and mix evenly;

[0041] The treatment method of modified recycled coarse aggregate is to place the crushed coarse aggregate in a water glass solution with a concentration of 5%, soak for 7 hours, and then add the recycled coarse aggregate to a 10% polyvinyl alcohol solution with a concentration of Continue soaking in the mixed solution of 7% silane emulsion for 10h, wherein the weight ratio of polyvinyl alcohol solution to silane emulsion is 1.3;

[0042] S2: Add 5.0 parts by weight of polycarboxylate superplasticizer and 5.0 parts of slump-retaining enhancer to 170 parts of water, and mix evenly; The weight ratio is 1:1

[0043] S3: Add the mixed liquid in step S2 to step ...

Embodiment 3

[0045] A method for preparing recycled concrete with high slump retention, comprising the steps of:

[0046] S1: Stir 220 parts by weight of cement, 490 parts of modified recycled coarse aggregate, 500 parts of crushed stone, 820 parts of natural sand, 130 parts of fly ash, and 98 parts of mineral powder, and mix evenly;

[0047] The treatment method of modified recycled coarse aggregate is to place the crushed coarse aggregate in a water glass solution with a concentration of 7%, soak for 9 hours, and then add the recycled coarse aggregate to a 12% polyvinyl alcohol solution with a concentration of The mixed solution of 10% silane emulsion continued to soak for 12h, wherein the weight ratio of polyvinyl alcohol solution to silane emulsion was 1.5;

[0048] S2: Add 5.8 parts by weight of polycarboxylate superplasticizer and 6.4 parts of slump-retaining enhancer to 185 parts of water, and mix evenly; The weight ratio is 1:1

[0049] S3: Add the mixed liquid in step S2 to step...

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Abstract

The invention discloses recycled concrete with high slump loss resistance and a preparation method thereof. The invention belongs to the field of building materials, the key points of the technical scheme comprise that the raw materials comprise 180-220 parts by weight of cement, 380-490 parts of a modified recycled coarse aggregate, 400-500 parts of gravels, 680-820 parts of natural sand, 90-130parts of fly ash, 65-98 parts of mineral powder, 156-185 parts of water, 4.2-5.8 parts of a polycarboxylate superplasticizer and 3.5-6.4 parts of a slump retaining enhancer. A treatment method of themodified recycled coarse aggregate comprises the steps: a crushed coarse aggregate is placed in a sodium silicate solution with the concentration of 3%-7% to be soaked for 4 h-9 h, then the recycled coarse aggregate is added into a mixed solution of a polyvinyl alcohol solution with the concentration of 8%-12% and a silane emulsion with the concentration of 4%-10% to be continuously soaked for 8 h-12 h, and the effect of improving the slump loss resistance of the recycled concrete is achieved.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a recycled concrete with high slump retention and a preparation method thereof. Background technique [0002] Waste concrete contains a large amount of sand and gravel aggregates. If they are recycled, it can not only reduce costs, save natural resources, alleviate the contradiction between supply and demand of aggregates, but also reduce the pollution of waste concrete to the environment. [0003] Recycled aggregate is the aggregate obtained by crushing, cleaning, grading and coordinating waste concrete in a certain proportion, and the concrete prepared by using recycled aggregate as part or all of the aggregate is called recycled aggregate concrete. The Concrete Technology Section realizes the reprocessing of waste concrete to restore its original performance and form new building material products. At present, an important indicator to measure the performance of fresh concre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B20/12
CPCC04B20/12C04B28/00C04B2201/50C04B18/16C04B18/12C04B14/068C04B18/08C04B24/24C04B2103/0068C04B12/04C04B20/1085C04B20/1051C04B20/1033
Inventor 俞裕星俞建松许广森陈经怀
Owner 深圳市恒星建材有限公司
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