الوصف

ceramic aggregate that is structurally strong, physically stable, durable, environmentally inert, light in weight, insulative .. LECA (Lightweight Expanded Clay Aggregate) is an aggregate made of expanded clay at average ***0 C° in rotary kiln, the Yielding gases are expanded by thousands of small bubbles as long as this temperature and those will be provide many voids and honeycombs at these round shape aggregates when melted materials become cold. The clays and shales expanded were developed about ***7 in Kansas City, Missouri, to the production in a rotary kin of a patented expanded aggregate known as Haydite which was used in the construction of USS Selma, an ocean-going ship launched in ***9 year. There following in the USA the development of a series of aggregates known as Gravelite, Perlite, Rocklite and etc. In Europe, LECA commenced in Denmark, Germany, Holland (Netherlands) and the UK. The manufactured aggregates are produce in various sizes; Four usual grades are (**4) mm, (***0) mm, (****5) mm and mix grade ***5 mm which has **0 kg/m3 maxdensity, LECA boulder is a the bigger size of LECA with ******0 mm size and less than **0 kg/m3 density. LECA has a long history of success in horticultural applications all over the world. It is marketed under various trade names and has established itself as the standard for creating planting media for rooftop gardens. This track record of proven performance demonstrates how LECA, at about *0% of the weight of natural planting media, contributes to sustainable development by conserving energy, reducing trucking requirements and minimizing the impact on structures. The use of this environmentally friendly ceramic material in green roof design helps address important issues such as managing storm water runoff, improving water quality, reducing urban heat, conserving energy, lowering dead load and increasing green space. The process produces a high quality ceramic aggregate that is structurally strong, physically stable, durable, environmentally inert, light in weight, and highly insulative. It is a non-toxic, absorptive aggregate that is dimensionally stable and will not degrade over time. LECA is an environmentally friendly, lightweight, ceramic product that saves material, labor and transportation cost. It also improves the function ability and service life when used in greenroofs and other planting media. These benefits support sustainable development and contribute to designs becoming LEED certified. For more detailed information on LEED