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A method for preparing air-entrained concrete using recycled concrete aggregates and air-entrained concrete

A technology of recycled concrete and air-entrained concrete, which is applied in the field of building materials, can solve the problems affecting the anti-crack performance of recycled air-entrained concrete blocks and the increase of porosity, so as to reduce the environmental burden, improve the bonding strength, and improve the compression resistance intensity effect

Active Publication Date: 2022-02-22
四川宏量基筑建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned related technologies, the inventor believes that the use of recycled concrete powder requires crushing of waste concrete. Waste concrete contains a certain amount of hardened cement mortar, and microcracks are likely to occur in these hardened cement mortar during the crushing process. Increased porosity affects the crack resistance of recycled aerated concrete blocks to a certain extent

Method used

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  • A method for preparing air-entrained concrete using recycled concrete aggregates and air-entrained concrete
  • A method for preparing air-entrained concrete using recycled concrete aggregates and air-entrained concrete
  • A method for preparing air-entrained concrete using recycled concrete aggregates and air-entrained concrete

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Embodiment 1

[0040] Embodiment 1: a kind of method utilizing recycled concrete aggregate to prepare air-entrained concrete comprises the steps:

[0041] S1 Recycled aggregate pretreatment: Take recycled concrete powder, sieve it with a sieve with a pore size of 500 μm, and select recycled concrete powder with a particle size not greater than 500 μm. Take by weighing 45kg nano-silica sol aqueous solution (model is LS30C50N, silicon dioxide content 50%, median particle size 30nm), add 40kg water and 10kg hydroxypropyl distarch phosphate, add 105kg regenerated concrete powder, with 200 rpm Stir at a rotating speed for 20 minutes, transfer the material to a ball mill, track the particle size of the material with a sieve with a pore size of 300 μm, and ball mill the material until the particle size is not greater than 300 μm, heat the material to 45°C and stir for 20 minutes, stop stirring, and then put the material at 80 Dry at ℃ for 150min to obtain recycled aggregate.

[0042] S2 Slurry pre...

Embodiment 2

[0046] The difference between embodiment 2 and embodiment 1 is that the specifications and models of nano-neutral silica sol used in embodiment 2 and embodiment 1 are different (provided by Shandong Baite New Material Co., Ltd., the model is LS50C30N, and the mass content of silicon dioxide is 30 %, median diameter 50nm), others are consistent with Example 1.

Embodiment 3

[0048] The difference between Example 3 and Example 1 is that step S1 of Example 3 does not ball mill the regenerated aggregate with a ball mill, and the others are consistent with Example 1.

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Abstract

The invention discloses a method for preparing air-entrained concrete by using recycled concrete aggregates and the air-entrained concrete, and relates to the technical field of building materials. A method for preparing air-entrained concrete by using recycled concrete aggregates, comprising the following steps: S1 recycled aggregate pretreatment: weighing recycled raw materials, drying, and obtaining recycled aggregates; recycled raw materials include: recycled concrete powder, nano-silica sol aqueous solution , hydroxypropyl distarch phosphate; S2 slurry preparation: take water, add slurry raw materials, ball mill to obtain fine slurry, add recycled aggregate, quicklime powder and cement, add aluminum powder, and obtain slurry; the material Slurry raw materials include the following raw materials: sand, fly ash, gypsum; S3 foaming static stop: inject the slurry into the mold, stop statically, and make the embryo body; S4 autoclave curing: transfer the embryo body into the autoclave, Autoclaved curing, made of air-entrained concrete. The preparation method has the advantage of improving the anti-crack performance of the product. Air-entrained concrete has the advantage of good crack resistance.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a method for preparing aerated concrete by utilizing recycled concrete aggregates and the aerated concrete. Background technique [0002] Air-entrained concrete generally uses sand or fly ash as the siliceous raw material, cement or lime as the calcareous raw material, and aluminum powder as the air-entraining agent. The aluminum powder reacts with the alkali in cement or lime to generate hydrogen. Bubbles are formed to produce a hollow structure, and then cured by high-temperature and high-pressure steam. The calcium and silicon raw materials in the material undergo crystallization reactions to form high-strength mullite, which provides the strength and hardness required for concrete buildings. Air-entrained concrete has the advantages of light weight, good sound insulation performance and excellent thermal insulation performance, and is gradually widely used in the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14C04B18/02C04B38/02C04B18/16C04B24/28B28C5/00B28C5/08B28B13/02B28B11/24C04B111/34
CPCC04B28/144C04B18/022C04B38/02C04B18/16C04B24/282B28C5/006B28C5/08B28B13/02B28B11/245C04B2201/50C04B2111/343Y02W30/91
Inventor 林茂张晓莲陈治勇
Owner 四川宏量基筑建材有限公司
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