Method for preparing active steel powder and preparing concrete using steel powder
A technology of concrete and steel powder, which is applied in the interdisciplinary field to achieve the effects of reducing water consumption, improving early strength and increasing specific surface area
Inactive Publication Date: 2008-05-14
CENT SOUTH UNIV
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It's just that these effective technologies have not been grafted and applied to steel slag concrete
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Embodiment 1
[0015] Example 1: Steel slag crushed by a vibrating mill (cutting through a 20-mesh sieve), 5 portions of 1 kg steel slag were randomly weighed, and the original particle size distribution was measured. Then ball mill in a high-energy ball mill for 1 to 5 hours, wherein the ball-to-material ratio is 2 / 1 to 6 / 1, the masses of a single steel ball are 142.21g (A) and 49.35g (C), and the diameters are 3.32 and 2.39cm, to obtain steel pink. Sieve the obtained steel powder with a 60-mesh standard sieve to remove large particle materials such as iron filings greater than 60 mesh. Take 341g of steel powder, 17.05g of CaSO 4 , 13.64gNa 2 SO 4 , 34.1ml of water glass, adding an appropriate amount of water and 0.7% polycarboxylate superplasticizer to obtain a mixture slurry with good fluidity, and after stirring for 3 hours, the active steel powder slurry was obtained. Replacing 10% and 20% of cement is used to configure concrete and weighs respectively 1.705, 1.53kg (steel slag repl...
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Abstract
The invention relates to a method in processing ultra-fine steel powder and a craft in preparing the concrete by recycle utilization of the steel powder. The invention is characterized in that a high-energy ball milling is used to mill the steel slag, and the scrap iron and other components difficult to be milled are eliminated by screening after the ball milling; thus the steel powder with the specific surface area of 2885 to 5846 square centimeter / g, particle size of 0.09mm and the percent content above 50% is achieved. The invention is characterized in that the mechanical force principle is used to handle the steel slag and the chemical phases of Ca (OH) 2 or other substance are changed and thus the components of the steel powder are more favorable for hydration. The invention has the advantages of simple technology, relatively mild conditions and easy operation by adopting the microwave and chemical method to activate the steel powder; the invention also has the advantages of relatively large surface area and evenly distributed steel powder. The processed steel powder can replace 10% to 40% cement. On the premise of keeping the fluidity of the concrete, the intensity in three days of the invention can be kept at 20 to 30MPa, which can fully satisfy the demand of the project construction.
Description
technical field [0001] The invention relates to a method for processing ultrafine active steel powder and a method for preparing concrete by using steel powder, and belongs to the interdisciplinary fields of inorganic non-metallic materials, environmental engineering, and mineral processing engineering. Background technique [0002] Steel slag refers to the solid waste slag discharged in large quantities by the iron and steel industry. Steel slag has a phase composition similar to ordinary Portland cement and has certain activity. This type of waste slag has the potential to be widely used in industry due to its potential activity and large distribution. It can be used as roadbed materials, raw materials for steel slag cement, high-performance concrete admixtures, fillers, etc., and has a huge market. Prospects. Since the 1990s, fly ash and slag have been widely used in concrete. [0003] The current research on active steel slag mainly includes: Chen Ping’s method for pr...
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IPC IPC(8): B22F9/04B22F1/00C04B22/04
Inventor 杨华明刘天成唐爱东
Owner CENT SOUTH UNIV