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A steel slag cement expansion agent and Portland cement doped with the expansion agent

A technology of expansion agent and silicate, which is applied in the field of steel slag cement expansion agent and Portland cement mixed with the expansion agent, cement expansion agent and Portland cement, and can solve the problem that cannot be used as cement expansion agent and other problems, to achieve the effects of reducing shrinkage, simple preparation process, and low cost

Active Publication Date: 2021-06-22
YANCHENG GUOTAI CONCRETE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: Aiming at the problem that steel slag cannot be used as cement expansion agent due to free CaO or MgO, the present invention provides a steel slag-based cement expansion agent. By treating steel slag, the expansion characteristics of free CaO or MgO are controlled, The steel slag can be used as a cement expansion agent; at the same time, the invention also provides a Portland cement mixed with the steel slag cement expansion agent

Method used

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  • A steel slag cement expansion agent and Portland cement doped with the expansion agent
  • A steel slag cement expansion agent and Portland cement doped with the expansion agent
  • A steel slag cement expansion agent and Portland cement doped with the expansion agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The experimental conditions are as follows:

[0026]

[0027] The preparation method of Portland cement mixed with steel slag cement expansion agent is as follows: prepare steel slag cement expansion agent according to the above experimental conditions, and mix P·II 42.5 Portland cement with a dosage of 2%. Add water for mixing, the water-binder ratio is 0.44. The cement slurry is poured into a mold of 4cm*4cm*16cm, formed by vibration, and after 28 days of standard curing, its compressive strength is measured according to GB175-2017. The cement slurry is poured into a mold of 4cm*4cm*14cm, formed by vibration, cured in water for 7 days and then cured in air for 21 days, and the limit expansion rate is tested according to GB / T 23439-2017. See attached table 2 for its compressive strength and limited expansion rate.

Embodiment 2

[0029] The experimental conditions are as follows:

[0030]

[0031] The preparation method of Portland cement mixed with steel slag cement expansion agent is as follows: prepare steel slag cement expansion agent according to the above experimental conditions, and mix P·II 42.5 Portland cement with a dosage of 2%. Add water for mixing, the water-binder ratio is 0.44. The cement slurry is poured into a mold of 4cm*4cm*16cm, formed by vibration, and after 28 days of standard curing, its compressive strength is measured according to GB175-2017. The cement slurry is poured into a mold of 4cm*4cm*14cm, formed by vibration, cured in water for 7 days and then cured in air for 21 days, and the limit expansion rate is tested according to GB / T 23439-2017. See attached table 2 for its compressive strength and limited expansion rate.

Embodiment 3

[0033] The experimental conditions are as follows:

[0034]

[0035] The preparation method of Portland cement mixed with steel slag cement expansion agent is as follows: prepare steel slag cement expansion agent according to the above experimental conditions, and mix P·II 42.5 Portland cement with a dosage of 4%. Add water for mixing, the water-binder ratio is 0.44. The cement slurry is poured into a mold of 4cm*4cm*16cm, formed by vibration, and after 28 days of standard curing, its compressive strength is measured according to GB175-2017. The cement slurry is poured into a mold of 4cm*4cm*14cm, formed by vibration, cured in water for 7 days and then cured in air for 21 days, and the limit expansion rate is tested according to GB / T 23439-2017. See attached table 2 for its compressive strength and limited expansion rate.

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Abstract

The invention discloses a steel slag cement expansion agent and Portland cement mixed with the expansion agent. The steel slag cement expansion agent is prepared by the following method: firstly, glycerin with a mass ratio of 1:1:50-80 , strontium nitrate and water are mixed to prepare an extraction solution, then steel slag powder is soaked in the extraction solution, and the solution is filtered to obtain a steel slag cement expansion agent. The main chemical components of steel slag are CaO and MgO as the source of CaO in the expansion agent, and an extraction solution is prepared to extract part of the free CaO or MgO in the steel slag, so that the expansion caused by CaO and MgO can be controlled. In the portland cement doped with the steel slag cement expansion agent of the present invention, the mixing amount of the steel slag cement expansion agent is 2 to 10%, and after the steel slag cement expansion agent is mixed, the cement strength can be improved to a certain extent. Mechanical strength, significantly improve the impermeability of cement, and reduce the shrinkage of cement.

Description

technical field [0001] The invention relates to a cement expansion agent and Portland cement, in particular to a steel slag cement expansion agent and Portland cement mixed with the expansion agent, belonging to the field of building materials. Background technique [0002] Steel slag is a solid slag body composed of slag-forming materials, smelting reactants, eroded and fallen furnace body and furnace repair materials, impurities brought in by metal charge and slag-forming materials specially added to adjust the properties of steel slag during the steel production process. , is a by-product of the process of producing steel. In production, 15% to 20% of steel slag is produced for every 1 ton of steel produced. The total amount of steel slag accumulated in my country's national steelmaking plants exceeds 200 million tons, covering an area of ​​more than 10,000 mu, and is still increasing by more than 30 million tons every year. If these steel slags are not comprehensively ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/02C04B28/04C04B28/08
CPCC04B28/04C04B28/08C04B40/0039C04B2111/00017C04B2201/50C04B24/026C04B22/085C04B22/0006
Inventor 仓定龙侯贵华陈思佳姚恒山嵇蔚冰李晨钟刘俊王军卫姚庚王学为高峰杨华筛成海翔朱育金陈龙顾威桥朱珠陈爱仓东婷仓东芝卞连玉
Owner YANCHENG GUOTAI CONCRETE
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