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Compound mineral admixture

A technology for compound minerals and raw materials, applied in the field of highly active compound mineral admixtures, can solve the problems of high energy consumption and poor technical economy, and achieve the effects of increasing the heat of hydration, reducing energy consumption, and reducing consumption of natural resources.

Inactive Publication Date: 2017-01-04
SHANGHAI BAOTIAN NOVEL BUILDING MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the method of increasing the specific surface area of ​​steel slag powder can improve the activity of steel slag powder, the energy consumption is high and the technical economy is poor.

Method used

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  • Compound mineral admixture
  • Compound mineral admixture
  • Compound mineral admixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Steel slag fine powder 30wt%,

[0020] S95 grade slag fine powder 66wt%,

[0021] Sintered desulfurization ash 2wt%,

[0022] Desulfurization gypsum powder 2wt%.

[0023] The above components are mechanically stirred and mixed uniformly to make samples, and the performance of the composite admixture samples is tested with reference to GB / T18046-2008 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete". The benchmark cement is Conch brand 42.5 Portland cement, and the test results are shown in Table 1.

Embodiment 2

[0025] Steel slag fine powder 35wt%,

[0026] S95 grade slag fine powder 61wt%,

[0027] Sintered desulfurization ash 1wt%,

[0028] Desulfurization gypsum powder 3wt%.

[0029] The above components are mechanically stirred and mixed uniformly to make samples, and the performance of the composite admixture samples is tested with reference to GB / T18046-2008 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete". The benchmark cement is Conch brand 42.5 Portland cement, and the test results are shown in Table 1.

Embodiment 3

[0031] Steel slag fine powder 40wt%,

[0032] S95 grade slag fine powder 54wt%,

[0033] Sintered desulfurization ash 2wt%,

[0034] Desulfurization gypsum powder 4wt%.

[0035] The above components are mechanically stirred and mixed uniformly to make samples, and the performance of the composite admixture samples is tested with reference to GB / T18046-2008 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete". The benchmark cement is Conch brand 42.5 Portland cement, and the test results are shown in Table 1.

[0036] Note: The comparison sample composition is:

[0037] Steel slag fine powder 30wt%, S95 grade slag fine powder 70wt%.

[0038] Table 1 Composite mineral admixture performance test results

[0039]

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Abstract

The invention relates to the technical field of building materials, in particular to a compound mineral admixture with high activity. The compound mineral admixture comprises raw materials in percentage by weight as follows: 50%-66% of slag micropowder, 25%-40% of steel slag micropowder, 1%-5% of sintering desulfurization ash and 1%-10% of desulfurization gypsum powder. The sintering desulfurization ash and the desulfurization gypsum powder are taken as activators, the exited activity is good, the 7-day activity index is increased by 10%-15% on year-on-year basis, the 28-day activity index is increased by 7%-12% on year-on-year basis, and the production cost is low. The compound mineral admixture prepared with the formula system has good early strength, the long-age strength can be increased continuously, and can effectively improve the working performance of concrete and reduce loss at the slump time and is easy to vibrate when applied as ready-mixed concrete; technical indexes of heat of hydration, flexural strength, permeability resistance, wear resistance, dry shrinkage resistance and the like of the concrete can be improved.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a highly active composite mineral admixture. Background technique [0002] Steel slag is a solid waste produced in the steelmaking process. Existing studies have shown that finely ground steel slag powder, as one of the concrete admixtures, can improve the work performance of freshly mixed concrete, increase the flexural strength, wear resistance and later strength of concrete . However, due to the high formation temperature of steel slag and dense mineral crystallization, the early hydration rate of steel slag powder is slow, the hydration activity is low, and the early strength is low, which limits its use in concrete. [0003] Blast furnace slag is the waste slag produced when smelting pig iron. When smelting pig iron, the raw materials of the blast furnace are added. In addition to iron ore and fuel (coke), a considerable amount of limestone and dolomite need to b...

Claims

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Application Information

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IPC IPC(8): C04B18/14C04B18/30
CPCY02W30/91
Inventor 顾文飞唐欧靖康明刘洋张龙李斌
Owner SHANGHAI BAOTIAN NOVEL BUILDING MATERIALS
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