ASH ALCHEMY-​ Ash Utilisation for The Protection and Improvement of Electrical Transmission Infrastructure

Cyril Attwell, ARC Innovations
Kelley Reynolds-Clausen, Eskom Holdings SOC LTD
Phenyo Mvuyana, Eskom Holdings SOC LTD

Description

Ash Utilisation for The Protection and Improvement of Electrical Transmission Infrastructure Authors Mr. Cyril Attwell - South Africa - ARC Innovations Dr. Kelley Reynolds-Clausen - South Africa - Eskom Holdings SOC LTD Ms. Phenyo Mvuyana - South Africa - Eskom Holdings SOC LTD Abstract Kelley Anne Reynolds-Clausen1, Phenyo N Mvuyana2, Dan Dukhan2 and Cyril N Attwell3 1Eskom Research, Testing and Demonstration, Eskom Holdings SOC Ltd, South Africa. reynolka@eskom.co.za. 2Eskom Transmission, Eskom Holdings SOC, Ltd, South Africa mvuyanp@eskom.co.za; Dukhand@eskom.co.za 3ARC Innovations, 83 Bonnyvale Road, .Norton Home Estates, Gauteng, South Africa. Cyril.attwell@eskom.co.za Keywords: Alkali-activation, coal ash, shotcrete, concrete poles, grout One of the broadest reaching coal ash beneficiation applications is that of coal ash alkali activation (AA) to form concrete and grout type products. However, conventional AA utilises hazardous activators, limiting commercial application but user-friendly activators, created in South Africa, are now commercially available. This paper focuses on safe AA applications, by using shotcrete for pylon and gabion metal protection, producing lego-shaped stay-blocks and concrete poles and using AA grout for sinkhole stabilisation. AA shotcrete allows for the spraying of the product onto plant components to passivate the metal, limiting corrosion and to act as an anti-theft mechanism of the plant components. Stay blocks have been produced and will now be cast in Lego-shaped moulds which can be linked together without the need for cement. These blocks are used for pylon stabilisation during maintenance. Concrete, 9 and 11m distribution poles will replace wooden poles currently being used. They will minimise fire, pest and water risks to the wooden poles, increasing service life and minimising environmental impact, whilst being able to handle the conventional forces placed on a wooden pole. Grouting material, with a strength of 2 to 5MPa, will be produced and placed into a sinkhole, to stabilise the structure.

 
May 14th, 1:30 PM May 14th, 2:00 PM

ASH ALCHEMY-​ Ash Utilisation for The Protection and Improvement of Electrical Transmission Infrastructure

Grand Rapids, Michigan

Ash Utilisation for The Protection and Improvement of Electrical Transmission Infrastructure Authors Mr. Cyril Attwell - South Africa - ARC Innovations Dr. Kelley Reynolds-Clausen - South Africa - Eskom Holdings SOC LTD Ms. Phenyo Mvuyana - South Africa - Eskom Holdings SOC LTD Abstract Kelley Anne Reynolds-Clausen1, Phenyo N Mvuyana2, Dan Dukhan2 and Cyril N Attwell3 1Eskom Research, Testing and Demonstration, Eskom Holdings SOC Ltd, South Africa. reynolka@eskom.co.za. 2Eskom Transmission, Eskom Holdings SOC, Ltd, South Africa mvuyanp@eskom.co.za; Dukhand@eskom.co.za 3ARC Innovations, 83 Bonnyvale Road, .Norton Home Estates, Gauteng, South Africa. Cyril.attwell@eskom.co.za Keywords: Alkali-activation, coal ash, shotcrete, concrete poles, grout One of the broadest reaching coal ash beneficiation applications is that of coal ash alkali activation (AA) to form concrete and grout type products. However, conventional AA utilises hazardous activators, limiting commercial application but user-friendly activators, created in South Africa, are now commercially available. This paper focuses on safe AA applications, by using shotcrete for pylon and gabion metal protection, producing lego-shaped stay-blocks and concrete poles and using AA grout for sinkhole stabilisation. AA shotcrete allows for the spraying of the product onto plant components to passivate the metal, limiting corrosion and to act as an anti-theft mechanism of the plant components. Stay blocks have been produced and will now be cast in Lego-shaped moulds which can be linked together without the need for cement. These blocks are used for pylon stabilisation during maintenance. Concrete, 9 and 11m distribution poles will replace wooden poles currently being used. They will minimise fire, pest and water risks to the wooden poles, increasing service life and minimising environmental impact, whilst being able to handle the conventional forces placed on a wooden pole. Grouting material, with a strength of 2 to 5MPa, will be produced and placed into a sinkhole, to stabilise the structure.