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High performance mineral admixture and its application in concrete

A technology of mineral admixture and ultra-fine mineral powder, which is applied in the field of building materials and concrete materials, can solve problems such as the inability to meet the large consumption of steel slag, and achieve the effects of improving product mechanical properties, improving early strength, and ensuring stability

Active Publication Date: 2021-10-08
武汉武新新型建材股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the performance of G95 steel slag powder is slightly close to that of S95 slag powder, but the content of steel slag powder in G95 steel slag powder is less than 30%. Only the simple compounding of steel slag powder and slag powder cannot meet the large consumption of steel slag.

Method used

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  • High performance mineral admixture and its application in concrete
  • High performance mineral admixture and its application in concrete
  • High performance mineral admixture and its application in concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A mineral admixture, which is prepared with steel slag powder as the main material and slag, coal slag, early strength agent, ultrafine mineral powder, rapid hardening sulfoaluminate cement, clinker powder, and silica fume as auxiliary materials; The raw materials are calculated in terms of mass percentage: steel slag powder 60%, slag 10%, coal slag 5%, superfine mineral powder 5%, rapid hardening sulfoaluminate cement 5%, clinker powder 5%, early strength agent 5%, silicon Ash 5%.

[0041] The performance of the mineral admixture obtained in the present embodiment is as follows: the density is greater than 3.0g / cm 3 , the specific surface area is greater than 440m 2 / kg, sulfur trioxide content is less than 2.0%, loss on ignition is less than 1.0%, moisture content is less than 0.1%, f-CaO content is less than 2.0%, chloride ion content is less than 0.006%, activity index is 88% in 7 days, 105% in 28 days

Embodiment 2

[0043] A mineral admixture, which is prepared with steel slag powder as the main material and slag, coal slag, early strength agent, ultrafine mineral powder, rapid hardening sulfoaluminate cement, clinker powder, and silica fume as auxiliary materials; Raw materials are calculated according to mass percentage: each raw material is calculated according to mass percentage: steel slag powder 70%, slag 2.5%, coal slag 2.5%, ultrafine mineral powder 5%, rapid hardening sulfoaluminate cement 5%, clinker powder 5% , Early strength agent 5%, silica fume 5%.

[0044] The performance of the mineral admixture obtained in the present embodiment is as follows: the density is greater than 3.0g / cm 3 , the specific surface area is greater than 440m 2 / kg, sulfur trioxide content is less than 2.0%, loss on ignition is less than 1.0%, water content is less than 0.1%, f-CaO content is less than 2.0%, chloride ion content is less than 0.006%, activity index is 85% in 7 days, 102% in 28 days

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Abstract

The invention discloses a mineral admixture, which is prepared with steel slag powder as the main material and slag, coal slag, early strength agent, ultrafine mineral powder, rapid hardening sulfoaluminate cement, clinker powder and silica fume as auxiliary materials. Each raw material is calculated according to mass percentage: steel slag powder 60‑70%, slag 8‑12%, coal slag 4‑6%, ultrafine mineral powder 5%‑10%, rapid hardening sulfoaluminate cement 3‑6% , clinker powder 4‑6%, early strength agent 3‑7%, silica fume 5%‑10%. The invention uses early-strength cement and silica fume admixture to make up for the disadvantage of steel slag powder's insufficient early strength, and uses ultra-fine mineral powder to ensure the stable development of strength throughout the age. At the same time, it uses a vertical mill to grind steel slag. Among them, the high-temperature hot air in the vertical mill can also digest a large amount of f-CaO, thereby ensuring the stability of the mineral admixture, making its workability, mechanical properties, and durability meet the relevant requirements.

Description

technical field [0001] The invention belongs to the invention field of building materials and concrete materials, and in particular relates to a mineral admixture mainly composed of vertical mill steel slag powder and its application in concrete. Background technique [0002] Steel slag is a by-product of the steelmaking process. It is composed of various oxides formed by the oxidation of impurities such as silicon, manganese, phosphorus, and sulfur in pig iron during the smelting process, and salts formed by the reaction of these oxides with solvents. The mineral composition of steel slag is mainly tricalcium silicate, followed by dicalcium silicate, RO phase, dicalcium ferrite and free calcium oxide. Steel slag is divided into three types: electric furnace steel slag, open hearth furnace steel slag and converter steel slag. [0003] Steel slag is waste slag produced in the metallurgical industry, and its production rate is 8% to 15% of crude steel output. The amount of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/08C04B28/04
CPCC04B28/04C04B40/0039C04B2201/50C04B18/142C04B18/141C04B18/103C04B18/146C04B22/085C04B7/02C04B7/32
Inventor 李仕彬王文涛刘艳苏瑶
Owner 武汉武新新型建材股份有限公司