Method for processing of pozzolans

A pozzolanic, fly ash technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the unavoidable fluctuation of fly ash performance, constant quality of final products, and cannot improve fly ash performance. and other problems to achieve the effect of increasing the amount of substitution, reducing emissions and energy consumption

Active Publication Date: 2013-03-27
PROCEDO ENTERPRISES ETAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

All the above known methods either do not lead to a significant improvement of the properties of the fly ash as a concrete component, or do not avoid fluctuations in the properties of the fly ash and guarantee a constant quality of the final product

Method used

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  • Method for processing of pozzolans
  • Method for processing of pozzolans
  • Method for processing of pozzolans

Examples

Experimental program
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Embodiment

[0026] Class F fly ash according to ASTM C having the chemical composition and particle size distribution (PSD) shown in Tables 1 and 2 were tested in accordance with the present invention.

[0027] Table 1. Chemical composition

[0028]

[0029] Table 2. Particle Size Distribution

[0030]

[0031] Table 3 below shows 50 / 50 blends by weight of Portland cement (type 1 according to ASIM C 150) with untreated and secondary cementitious material (SCM) treated according to the invention according to ASTM C 109 strength development.

[0032] Table 3. Compressive Strength Development, MPa(psi)

[0033]

[0034] The test results obtained show that the invention converts the completely inert coarse fraction of fly ash with zero pozzolanic activity into an active fraction which contributes significantly to strength. A blended cement containing 50% Portland cement and 50% fly ash treated in accordance with the invention exhibited a 50 / 50 blend with Type I cement and blast fu...

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Abstract

Method for processing of pozzolans comprising fly ash such as Class F and / or Class C fly ash used for preparation of mortars and concretes, characterized in, that the pozzolans is subjected to a high energetic mechanical processing by means of grinding in a grinding equipment to a fineness of the final product with a retention on a sieve 30 microns being less than 5%, whereby the pozzolan particles receive mechanical impulses when non-cenosphere in the form of coarse scoria particles are disintegrated and whereby the surface of cenosphere grinded particles is activated.

Description

technical field [0001] The present invention relates to a method of processing pozzolans in the form of fly ash. Background technique [0002] Fly ash is used in the production of concrete, mortar and other cementitious mixtures. Fly ash is a by-product of coal-fired power plants and is produced worldwide in large quantities each year. [0003] The method eliminates the change of fly ash quality caused by the change of coal chemical composition and coal combustion process parameters. Treatment of pozzolanic materials, ie, fly ash, according to the method of the present invention significantly improves the performance of concrete and replaces standard Portland cement at higher levels, which results in significant economic and environmental benefits. [0004] Fly ash typically contains about 85% vitreous amorphous components in the form of cenosphere particles. According to ASTM C 618, fly ash is divided into two classes: Class C and Class F. Class F fly ash typically cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/00C04B18/08C04B40/00
CPCC04B20/026C04B28/021Y02W30/91C04B18/08C04B20/008C04B18/082C04B7/02C04B20/0076C04B40/0042
Inventor V·龙尼I·龙尼C·W·派克
Owner PROCEDO ENTERPRISES ETAB
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