Characterisation and Pozzolanic Reactivity of Incineration Ashes Size - Separated by a Novel, Closed Circuit Classification Technology

Author(s): Peter Nielsen, Ruben Snellings, Sumit Srivastava and Michel Loots
Paper category: Proceedings
Book title: Proceeding of the 71st RILEM Annual Week & ICACMS 2017
Editor(s): Manu Santhanam, Ravindra Gettu, Radhakrishna G. Pillai, Sunitha K. Nayar
ISBN:978-2-35158-195-7, 978-2-35158-190-2 (Set)
e-ISBN: 978-2-35158-191-9
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 97-100
Total Pages: 4
Language : English

Abstract: High grade mineral powders are essential as high-quality supplementary cementitious materials and fillers. In particular high performance concrete requires the addition of ultrafine (0.2 - 2 μm) reactive powders to achieve an increase in strength and durability. Silica fume, a by-product from the (ferro-) silicon industry, is commonly used for this purpose. Since demand by far outstrips supply (1-2.5 Mt/y), the silica fume market experiences high prices and market volatility. As a very fine material, silica fume can be substituted by other very fine minerals such as the ultrafine fraction of fly ash from coal fired power plants. Very fine reactive powders can also be recovered from other abundant secondary resources such as biomass and waste incineration ashes. The key to economically recovering ultrafine powders is an innovative size-separation technology based on the generation of dusty plasma that enables to operate in closed circuit on dry powders.
This contribution describes the physico-chemical properties of the size-separated incineration
ashes.

Online publication :2017
Publication type :full_text
Public price (Euros) : 0.00