Expanded shale, clay and slate (ESCS) is a unique
lightweight aggregate prepared by expanding
select minerals in a rotary kiln at temperatures
over 1000° C. The production and raw material
selection processes are strictly controlled to
insure a uniform, high quality product that is
structurally strong, stable, durable and inert,
yet also lightweight and insulative. ESCS lightweight
aggregate gives designers greater flexibility in creating
solutions to meet the challenges of dead load, energy
budgets, terrain, seismic conditions, construction
schedules and budgets in today’s marketplace.
The unique properties of ESCS, ceramic
lightweight aggregate provides time-tested
sustainable performance. This material offers
economical and environmental engineering
solutions in structural concrete, geotechnical,
asphalt, concrete masonry, and other applications.
Basic History of ESCS and ESCSI
For nearly a century Expanded Shale, Expanded Clay and
Expanded Slate has been used successfully around the world in
more than 50 different types of applications. The most notable
among these are SmartWall lightweight concrete masonry units,
high-rise buildings, concrete bridge decks, high performance
marine platforms, asphalt bituminous surface treatments,
lightweight chip seal, soil conditioner and lightweight
Expanded shale, clay and slate structural lightweight aggregate,
SLA, as manufactured by the rotary kiln process was originally
developed in 1908 and patented in 1918 as Haydite®. Today, SLA
is available throughout the world.
ESCS ceramic lightweight aggregate improves concrete in several ways. The most notable are weight reduction and the ability to design with specified density concrete. ESCS also provides moisture for internal curing which improves the quality of concrete.
ESCSI is the international trade association for manufacturers of rotary kiln-produced expanded shale, expanded clay and expanded slate lightweight aggregate. ESCSI promotes the extensive use of rotary kiln-produced lightweight aggregate in the lightweight concrete masonry and structural lightweight concrete markets, as well as use in asphalt, geotechnical and other applications. Based on research and development, educational material is disseminated to all phases of the building industry. The association works closely with other technical organizations, ACI, ASTM, etc. to maintain product quality, life-safety and professional integrity throughout the construction industry and related building code bodies.
General Information on ESCS