CONCRETE

[:ru]Паломо А.[:en]Palomo A.[:] [:ru]профессор, Институт им. Эдуардо (CSIC), г. Мадрид, Испания[:en]Professor, Instituto de Ciencias de la Construcción Eduardo Torroja, IETcc (CSIC), Madrid, Spain[:]

[:ru]Мальцева О.[:en]Maltseva O.[:] [:ru]ведущий научный сотрудник, Институт им. Эдуардо (CSIC), г. Мадрид, Испания[:en]Senior researcher, Instituto de Ciencias de la Construcción Eduardo Torroja, IETcc (CSIC), Madrid, Spain[:]

[:ru]Фернандес-Хименес А.[:en]Fernandez-Jimenez A.[:] [:ru]ведущий научный сотрудник, Институт им. Эдуардо (CSIC), г. Мадрид, Испания[:en]Senior researcher, Instituto de Ciencias de la Construcción Eduardo Torroja, IETcc (CSIC), Madrid, Spain[:]

Alitinform №4-5 (40) 2015 г. 48-57 p.

Abstract

Coal fly ash can be subject to large variations in characteristics as a function of the type of coal burned, the operation status of the coal power plant and the ash separation technology employed. Good quality fly ash is in demand in the cement industry (and in concrete plants) due to its ability to partially substitute some Portland cement (typically between 10 % and 25 %). On the other hand, coal bottom ash, due to its coarser nature, is generally considered as a low value by-product that may at best be used as a partial replacement for aggregates in concretes or as geotechnical fill material.
In this paper authors propose the utilization of the new generation of additives by which to transform regular coal combustion products (fly ash and/or bottom ash) into Ultra-Reactive Ash (URA). URA, in summary, is a product with very positive cementitious characteristics which can become the most important component of a new family of eco-cements (with less than 30 % clinker) and/or a fundamental component of a new family of extra-durable concretes (with a reduced amount of OPC).

Key words:

cement additives; supplementary cementitious materials (SCMs); activation of fly ash; URA (Ultra-Reactive Ash); hybrid cements