Method for producing concrete by using mixing station waste slag and obtained concrete

A mixing station and concrete technology, which is applied in the field of concrete production from waste slag in a mixing station, can solve the problems of untreated waste slag, high processing cost, and high energy consumption, and achieve the effects of easy control of construction time, reduction of raw material costs, and reduction of consumption

Inactive Publication Date: 2019-11-15
CHINA 19TH METALLURGICAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this treatment method has the following problems: First, the waste residue cannot be fully utilized effectively. In the sieving treatment stage, only the slag powder with a particle size of ≤2.5 mm is screened out to enter the next processing stage, and most of the waste residue cannot be processed. Second, all slag powder with a particle size of ≤ 2.5mm needs to be ground for treatment, which consumes a lot of energy. If the entire treatment process is not properly controlled, it may result in higher treatment costs.

Method used

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  • Method for producing concrete by using mixing station waste slag and obtained concrete
  • Method for producing concrete by using mixing station waste slag and obtained concrete
  • Method for producing concrete by using mixing station waste slag and obtained concrete

Examples

Experimental program
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Effect test

Embodiment 1

[0044] Air-drying, stirring, drying, sieving, and grinding procedures are used to process the waste residue of the mixing station. The specific methods are as follows:

[0045] Naturally air-dry the waste slag from the mixing station until the water content is lower than 5wt%, and then sieve the waste slag with a particle size ≥ 70mm as component D, and the rest is waste slag with a particle size < 70mm;

[0046] The waste slag with a particle size of <70mm and the coarse aggregate are mixed and dried according to a certain ratio through a stirring dryer, so that the moisture content is lower than 2wt%, and then sieved after drying, and the slag powder with a particle size of ≤3mm is sorted out as a component A, particle size ≥ 31.5mm is component B; the rest is component C; after component B and component D are crushed, put them into the coarse aggregate bin and use them as coarse aggregate.

[0047] Component A is pulverized so that its specific surface area is 300-400m 2 / ...

Embodiment 2

[0057] Adopt the method for embodiment 1 to obtain component A and component C.

[0058] Component A is pulverized so that the specific surface area of ​​component A is 400-500m 2 / kg.

[0059] Prepare concrete (C25) as follows:

[0060] Weigh 240kg of cement, 1000kg of 5-31.5mm continuous graded crushed stone, 50kg of component C, 900kg of fine aggregate water-washed machine-made sand, 20kg of high-quality grade I fly ash as admixture, 20kg of mineral powder, and component A with a weighing scale. 30kg, mixing water 150kg, admixture polycarboxylate retarding pumping agent 5.0kg, add crushed stone, sand, cement, fly ash to the mixer in turn and mix evenly, at the same time, the admixture must first be added to the concrete mixing water Mix, then add the mixed liquid of water and admixture into the concrete mixer, and after fully stirring for 1 to 2.5 minutes, the concrete mixture is unloaded from the mixer and transported to the construction site by a concrete tank truck for...

Embodiment 3

[0064] Adopt the method for embodiment 1 to obtain component A and component C.

[0065] Component A is pulverized so that the particle size of component A is 500-600m 2 / kg.

[0066] Prepare concrete (C25) as follows:

[0067] Weigh 240kg of cement, 1000kg of 5-31.5mm continuous graded crushed stone, 50kg of component C, 900kg of fine aggregate water-washed machine-made sand, 20kg of high-quality grade I fly ash as admixture, 20kg of mineral powder, and component A with a weighing scale. 30kg, mixing water 150kg, admixture polycarboxylate retarding pumping agent 5.0kg, add crushed stone, sand, cement, fly ash to the mixer in turn and mix evenly, at the same time, the admixture must first be added to the concrete mixing water Mix, then add the mixed liquid of water and admixture into the concrete mixer, and after fully stirring for 1 to 2.5 minutes, the concrete mixture is unloaded from the mixer and transported to the construction site by a concrete tank truck for subsequen...

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Abstract

The invention relates to a method for producing concrete by using mixing station waste slag and the obtained concrete, and belongs to the technical field of recycling of solid waste. According to theprovided method for producing the concrete by using the mixing station waste slag, the mixing station waste slag is subjected to screening to obtain a component D with the particle diameter greater than or equal to 70 mm and the waste slag with the particle diameter smaller than 70 mm; the waste slag with the particle diameter smaller than 70 mm is subjected to screening after drying to obtain thewaste slag serving as a component A with the particle diameter less than or equal to 3 mm and the waste slag serving as a component B with the particle diameter greater than or equal to 31.5 mm, andthe remaining waste slag is a component C; the component B and the component D are broken to obtain a coarse aggregate; the component A and the component C are formulated according to a specific ratioto obtain the concrete. The mixing station waste slag is adopted for preparing the concrete, the concrete has good workability and meets the requirement for strength, the construction is convenient,the preparation method is simple and easy, and the mixing station waste slag is added, so that not only is the cost of raw materials reduced, the raw material pressure is relieved, the using amount ofthe raw materials is reduced, but also the waste slag generated by a mixing station can be comprehensively treated, and the purpose of environmental-protection production is achieved.

Description

technical field [0001] The invention relates to a method for producing concrete from waste slag in a mixing station and the obtained concrete, belonging to the technical field of solid waste recycling. Background technique [0002] Commercial concrete is a building material that consumes a lot. According to incomplete statistics, every 1m produced 3 Concrete will produce an average of 0.01t of waste slag (hereinafter referred to as waste slag) in the mixing station, and the annual output in Sichuan Province is about 117 million m 3 Calculated from left and right concrete, at least 1.17 million tons of waste residue will be generated every year. The treatment of waste residue in the mixing station is a traditional problem. The current general practice is that the unhardened scrap concrete enters the sand and gravel separator to realize the recycling of sand and gravel, and the sedimented waste is piled up in the mixing station and transported to the building after reaching a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/02
CPCC04B28/02C04B2111/00017C04B2201/50C04B14/02C04B14/06C04B18/08C04B18/141C04B2103/302C04B18/167
Inventor 黎超文军
Owner CHINA 19TH METALLURGICAL CORP
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