LECA (Lightweight Expanded Clay Aggregate) is a aggregate made of expanded clay at average 1200 ℃ in rotary kiln, the
Yielding gases are expanded by thousands of small bubbles as long as this temperature and porosity will appear by many
voids and honeycombs at these round shape aggregates when melted materials become cold. LECA is a manufactured
aggregate which has many advantages compare with natural lightweight aggregate and since 1917 has used under
different brand name in USA and Europe countries
