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Recycled concrete and preparation method thereof

A technology of recycled concrete and recycled coarse aggregate, applied in the field of concrete, can solve the problems of affecting the mechanical properties of recycled concrete, reducing slump, etc., and achieve the effects of high strength, improved bonding performance, and improved coagulation strength.

Inactive Publication Date: 2021-05-25
深圳市宝金华混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Because the waste concrete is subjected to a large external force during the crushing process, a large number of fine cracks will appear on the surface and inside of the recycled aggregate, making the water absorption rate and water absorption rate of the recycled aggregate much higher than that of the natural aggregate; The water absorption rate of the material increases, and the water consumption of the concrete mixture also increases. When the concrete is mixed, the slump will decrease, which will affect the mechanical properties of the recycled concrete.

Method used

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  • Recycled concrete and preparation method thereof

Examples

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preparation example Construction

[0042] Preparation example of hydrophobic silica fiber

[0043] The silica fiber in the following raw materials was purchased from the adapted fiber chopped strands produced by Henan Shenjiu Tianhang New Materials Co., Ltd., model SJ104; the silane coupling agent was purchased from the silane coupling agent produced by Nanjing Daoning Chemical Co., Ltd. The model is KH-550; toluene was purchased from Tianjin Kemiou Chemical Reagent Co., Ltd., analytically pure; the fluorosilane was purchased from the fluorosilane coupling agent produced by Hubei Kefule Material Technology Co., Ltd., the model is CFS-164; n-hexane was purchased In Shandong Liang New Material Technology Co., Ltd., the content is 97%; other raw materials and equipment are commercially available.

preparation example 1

[0044] Preparation Example 1: Hydrophobic silica fibers are prepared by the following method:

[0045] (1) Weigh 8 kg of silica fiber and place it in 30 kg of hydrochloric acid solution with a concentration of 0.1 mol / L for ultrasonic washing for 2 minutes, then ultrasonically wash with 50 kg of deionized water for 3 times, each time for 3 minutes, and dry at room temperature, then wash the Soak the silica fiber in 80kgKH-550 toluene solution for 12h, during which it was continuously stirred at a speed of 350r / min, and then soaked in 68kg of hydrochloric acid solution with a concentration of 0.12mon / L for 2h, during which it was continuously stirred at a speed of 500r / min Stir at a rotating speed of 100°C, take out the soaked silica fiber and dry it at room temperature to obtain a pretreated silica fiber;

[0046] (2) Mix 1 kg of fluorosilane with 50 kg of n-hexane, add 2 kg of deionized water adjusted by acetic acid to pH=3, and stir for 10 minutes at a speed of 650 r / min to ...

preparation example 2

[0048] Preparation Example 2: Hydrophobic silica fibers are prepared by the following method:

[0049] (1) Weigh 5 kg of silica fiber and place it in 30 kg of hydrochloric acid solution with a concentration of 0.1 mol / L for ultrasonic washing for 2 minutes, then ultrasonically wash with 50 kg of deionized water for 2 times, each time for 3 minutes, dry at room temperature, and wash the Soak the silica fiber in 70kgKH-550 toluene solution for 10h, during which it was continuously stirred at a speed of 350r / min, and then soaked in 60kg of hydrochloric acid solution with a concentration of 0.12mon / L for 1h, during which it was continuously stirred at a speed of 500r / min Stir at a rotating speed of 100°C, take out the soaked silica fiber and dry it at room temperature to obtain a pretreated silica fiber;

[0050] (2) Mix 1 kg of fluorosilane with 50 kg of n-hexane, add 2 kg of deionized water adjusted by acetic acid to pH=3, and stir for 10 minutes at a speed of 650 r / min to obtai...

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Abstract

The invention relates to the field of concrete, and particularly discloses recycled concrete and a preparation method thereof. The recycled concrete is prepared from the following raw materials in parts by weight: cement, slag powder, fly ash, modified recycled coarse aggregate, river sand, an additive and water, wherein the modified recycled coarse aggregate is prepared from waste concrete through crushing and screening, chemical coating and physical strengthening. The preparation method comprises the following steps: weighing the cement, the slag powder, the fly ash, the modified recycled aggregate, the river sand, the additive and the water, conducting uniform stirring, pouring the formed mixture into a mold, and carrying out curing to obtain the recycled concrete. According to the invention, crack holes in the surface of the recycled coarse aggregate can be filled, and the mechanical property of the recycled concrete is prevented from being affected by excessive water absorption of the recycled coarse aggregate.

Description

technical field [0001] The present application relates to the field of concrete, and more specifically, it relates to a recycled concrete and a preparation method thereof. Background technique [0002] Recycled concrete refers to new concrete made by crushing, cleaning and grading discarded concrete blocks, mixing them with grading in a certain proportion, replacing part or all of natural aggregates such as sand and gravel, and then adding cement and water. [0003] Because the waste concrete is subjected to a large external force during the crushing process, a large number of fine cracks will appear on the surface and inside of the recycled aggregate, making the water absorption rate and water absorption rate of the recycled aggregate much higher than that of the natural aggregate; As the water absorption rate of the material increases, the water consumption of the concrete mixture also increases. When the concrete is mixed, the slump will decrease, which will affect the me...

Claims

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Application Information

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IPC IPC(8): C04B28/02C04B111/34
CPCC04B28/02C04B2111/343C04B2201/50
Inventor 钟晓东钟晓升
Owner 深圳市宝金华混凝土有限公司
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