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Lightweight aggregates

In the UK the most commonly used lightweight aggregate is LYTAG, a sintered fly ash, also known as pulverised fuel ash (pfa). Other aggregates, made from a variety of raw materials, are shown in the Table below.

Aggregate type Trade name Dry density kg/m3
Furnace clinker
Processed fly ash/pfa Lytag 770-960
Foamed blastfurnace slag
Expanded clay, shale and slate Aglite, Leca, Solite 320-960
Pelletized expanded slag Pellite 800-1000
Wood and plastic particles
Expanded vermiculite

The density of the resulting concrete will depend on the type of aggregate used. Lightweight aggregates may be used for the coarse aggregate in conjunction with natural fines, or lightweight can be used for both coarse and fine aggregates.

Lytag aggregate

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Abrasion resistance of floors containing lightweight coarse aggregate