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High-seismic-resistance recycled aggregate concrete and preparation method thereof

A recycled aggregate and concrete technology, applied in the field of concrete, can solve the problems of high porosity of recycled aggregate, large water volume of recycled aggregate concrete, and limit the development of recycled aggregate concrete, and achieve the effect of enhancing compatibility

Active Publication Date: 2021-03-12
浙江天造环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The recycled aggregate obtained by simply crushing and screening the waste concrete directly contains a relatively large proportion of cement mortar, and the mutual impact between the recycled aggregate during the crushing and screening process will generate a large amount of waste inside the recycled aggregate. The microcracks make the recycled aggregate have the problems of high porosity, high water absorption, low bulk density, and high crushing index; the recycled aggregate is directly added to the concrete mortar without other special treatment. The obtained recycled aggregate concrete has a large amount of water, low strength after hardening, and poor impermeability, which limits the development of recycled aggregate concrete

Method used

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  • High-seismic-resistance recycled aggregate concrete and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0040] A high-shock-resistant recycled aggregate concrete, the raw material components are as follows: in parts by weight, 80 parts of mineral powder, 150 parts of cement, 10 parts of carboxylic acid water reducer, 200 parts of water, and 130 parts of additives.

[0041] The additives include the following raw material components: in parts by weight, 100 parts of waste concrete scraps, 20 parts of aromatic oil, 40 parts of chitosan, 30 parts of isopropanol, 20 parts of copper sulfate pentahydrate, and 20 parts of calcium lactate , 25 parts of EDOT, 50 parts of styrene, 10 parts of silane coupling agent, 50 parts of sodium hydroxide, 60 parts of epichlorohydrin, 30 parts of sodium citrate, and 80 parts of polyurethane resin.

[0042] S1. Material pretreatment:

[0043] A. Hammer the waste concrete block, and sieve to obtain waste concrete fragments with a block diameter of 1mm;

[0044] B. Stir the waste concrete scrap for 30 minutes at a rotating speed of 80r / min, and spray a...

Embodiment 2

[0052] A kind of high anti-seismic recycled aggregate concrete, the raw material components are as follows: in parts by weight, 100 parts of mineral powder, 200 parts of cement, 20 parts of carboxylic acid water reducer, 250 parts of water, and 150 parts of additives.

[0053] The additives include the following raw material components: in parts by weight, 150 parts of waste concrete scraps, 25 parts of aromatic oil, 50 parts of chitosan, 35 parts of isopropanol, 25 parts of copper sulfate pentahydrate, and 25 parts of calcium lactate , 30 parts of EDOT, 55 parts of styrene, 15 parts of silane coupling agent, 60 parts of sodium hydroxide, 65 parts of epichlorohydrin, 40 parts of sodium citrate, and 90 parts of polyurethane resin.

[0054] S1. Material pretreatment:

[0055] A. The waste concrete block is hammered and sieved to obtain waste concrete fragments with a block diameter of 40mm;

[0056] B. Stir the waste concrete scrap for 40 minutes at a speed of 90 r / min, and spr...

Embodiment 3

[0064] A high-shock-resistant recycled aggregate concrete, the raw material components are as follows: in parts by weight, 120 parts of mineral powder, 250 parts of cement, 30 parts of carboxylic acid water reducer, 300 parts of water, and 160 parts of additives.

[0065] The additives include the following raw material components: in parts by weight, 200 parts of waste concrete scraps, 30 parts of aromatic oil, 60 parts of chitosan, 40 parts of isopropanol, 30 parts of copper sulfate pentahydrate, and 30 parts of calcium lactate , 35 parts of EDOT, 60 parts of styrene, 20 parts of silane coupling agent, 70 parts of sodium hydroxide, 70 parts of epichlorohydrin, 50 parts of sodium citrate, and 100 parts of polyurethane resin.

[0066] S1. Material pretreatment:

[0067] A. The waste concrete block is hammered and sieved to obtain waste concrete fragments with a block diameter of 60mm;

[0068] B. Stir the waste concrete scrap for 50 minutes at a speed of 100r / min, and spray a...

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Abstract

The invention discloses high-seismic-resistance recycled aggregate concrete and a preparation method thereof. According to the invention, copper, copper oxide, calcium carbonate and other substances are generated in situ in pores of waste concrete crushed aggregates, and the porosity and water absorption rate of the waste concrete aggregates are reduced, so that the compactness and compressive strength of a concrete slurry are improved, and the impermeability and anti-seismic property of the concrete material are further enhanced; PEDOT and a silane coupling agent are also modified on the waste concrete crushed aggregates, and molecular long chains of the PEDOT and the silane coupling agent can be entangled with molecular chains of polystyrene and polyurethane, so that the shock resistanceof the concrete material is further improved, the brittleness of the concrete material is reduced, and the breaking risk of the concrete material is reduced; raw materials used in the method are simple and easy to obtain, reaction conditions are mild, and the method has very high practical value.

Description

technical field [0001] The invention relates to the technical field of concrete, in particular to a high-shock-resistant recycled aggregate concrete and a preparation method thereof. Background technique [0002] In order to improve people's living standards and vigorously develop the economy, China demolishes many old buildings every year. After the demolition of old buildings, a lot of construction waste will inevitably be left behind, including waste concrete blocks, brick slag, metal, asphalt concrete Blocks, various packaging materials, etc., among which concrete and mortar account for the largest proportion, accounting for 35-45% of the total construction waste; most construction waste cannot be disposed of in a timely and effective manner, and a lot of construction waste is directly transported to the suburbs Open-air stacking or simple landfilling in open spaces around the city; this treatment method will not only occupy a large amount of land resources, but also hav...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B18/16C04B111/20
CPCC04B2201/50C04B28/02C04B2111/2053C04B2111/00017C04B18/141C04B18/16C04B24/00C04B24/38C04B24/02C04B22/142C04B24/06C04B24/42C04B22/062C04B24/005C04B24/282C04B24/16Y02W30/91
Inventor 樊耀
Owner 浙江天造环保科技有限公司