Recycled concrete

A technology for recycled concrete and recycled aggregate, applied in the field of recycled concrete, can solve the problems of affecting workability, strong water absorption, and reduced strength, and achieve the effects of reducing dry shrinkage, enhancing adsorption, and improving strength.

Active Publication Date: 2019-01-22
河北雄安昝岗混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with natural aggregate, recycled aggregate has the characteristics of large void ratio, strong water absorption and low strength, which lead to some problems in the application of recycled concrete
Due to the large porosity and strong water absorption, it affects the workability (fluidity, plasticity, stability, and ease of solidification), and also causes a decrease in strength and an increase in dry shrinkage.

Method used

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  • Recycled concrete
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A recycled concrete, which is composed of the following raw materials in parts by weight: 230 parts of cement, 1300 parts of recycled aggregate, 200 parts of ferronickel slag, 80 parts of superfine admixture, 2 parts of water reducer, 0.5 part of retarder, 0.5 parts of shrinkage reducing agent, 0.1 part of reinforcing agent, 0.05 parts of air-entraining agent, and 108.5 parts of water.

[0024] The superfine admixture is ceramic tile polishing powder.

[0025] The retarder is composed of aminotrimethylene phosphonic acid, glycerol and sorbic acid in a weight ratio of 2:1:1.

[0026] The shrinkage reducing agent is dipropyl ethylene glycol monobutyl ether.

[0027] The enhancer is composed of sodium sulfite, diethanol monoisopropanolamine and tetramethylammonium hydroxide in a weight ratio of 5:5:1.

Embodiment 2

[0029] A recycled concrete, which is composed of the following raw materials in parts by weight: 330 parts of cement, 800 parts of recycled aggregate, 400 parts of ferronickel slag, 30 parts of superfine admixture, 5 parts of water reducing agent, 0.01 part of retarder, 3 parts of shrinkage reducing agent, 1 part of reinforcing agent, 0.01 part of air-entraining agent, and 126 parts of water.

[0030] The ultra-fine admixture is silicon carbide waste.

[0031] The retarder is composed of aminotrimethylene phosphonic acid, glycerol and sorbic acid in a weight ratio of 1:5:1.

[0032] The shrinkage reducing agent is dipropyl glycol.

[0033] The reinforcing agent is composed of sodium sulfite, diethanol monoisopropanolamine and tetramethylammonium hydroxide in a weight ratio of 10:1:1.

[0034] The air-entraining agent is sodium lauryl sulfate.

Embodiment 3

[0036] A recycled concrete, which is composed of the following raw materials in parts by weight: 300 parts of cement, 1100 parts of recycled aggregate, 300 parts of ferronickel slag, 50 parts of silicon carbide waste, 3 parts of water reducer, 0.1 part of retarder, shrinkage reducer 0.8 parts, 0.5 parts of reinforcing agent, 0.03 parts of air-entraining agent, and 122.5 parts of water.

[0037] The silicon carbide waste is subjected to the following treatment process: high-temperature calcination at 450°C for 2 hours, and then ground to a specific surface area of ​​620m after reaching room temperature 2 / kg.

[0038] The retarder is composed of aminotrimethylene phosphonic acid, glycerol and sorbic acid in a weight ratio of 1:1:1.

[0039] The shrinkage reducing agent is dipropyl ethylene glycol monobutyl ether.

[0040] The reinforcing agent is composed of sodium sulfite, diethanol monoisopropanolamine and tetramethylammonium hydroxide in a weight ratio of 6:3:1.

[0041] ...

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Abstract

Belonging to the technical field of environment-friendly building materials, the invention discloses a recycled concrete, which comprises the following raw materials by weight: 230-330 parts of cement, 800-1300 parts of recycled aggregate, 200-400 portions of nickel-iron slag, 30-80 parts of a superfine admixture, 2-5 parts of a water reducer, 0.01-0.5 part of a retarder, 0.5-3 parts of a shrinkage reducing agent, 0.1-1 part of a reinforcing agent, 0.01-0.05 part of an air entraining agent, and 108.5-126 parts of water. The recycled concrete provided by the invention makes heavy use of waste concrete, nickel-iron slag, ceramic tile polishing powder, silicon carbide waste and other solid waste, reduces the mining of natural sand and stone, and is conducive to the construction of ecologicalcivilization.

Description

technical field [0001] The invention belongs to the technical field of environmental protection building materials, and in particular relates to recycled concrete. technical background [0002] With the acceleration of infrastructure and urbanization in my country's buildings, roads, railways, bridges, etc., urban transformation and the rapid development of the construction industry, some old buildings, structures, and urban infrastructure will be demolished after their service life expires, which will cause more and more problems. There is an increasing amount of construction waste, of which concrete accounts for the largest share. According to the "Case Study on my country's Construction Waste Recycling Industry Innovation" by the Ministry of Commerce, the discharge of construction waste in my country is shocking. In recent years, the total amount of construction waste generated each year is estimated to be about 3.5 billion tons, accounting for about 40% of urban waste. . ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04
CPCC04B28/04C04B2201/50C04B18/167C04B18/16C04B18/141C04B18/165C04B2103/302C04B24/12C04B24/02C04B24/023C04B22/14C04B2103/304C04B24/16C04B24/32
Inventor 邰宝龙
Owner 河北雄安昝岗混凝土有限公司
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