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Lightweight expanded clay aggregate (LECA) or expanded clay (exclay) is a lightweight aggregate made by heating clay to around 1,200 °C (2,190 °F) in a rotary kiln. The heating process causes gases trapped in the clay to expand, forming thousands of small bubbles and giving the material a porous structure.
Semi-Hydroponics (Semi-Hydro or S/H) was the first passive hydroponic technique utilized for orchids, originating in the early 1990s, using Lightweight Expanded Clay Aggregate (LECA) as a medium in solid-bottomed containers, into which one or two, small-diameter holes were placed in the sidewall, setting the depth of the internal reservoir.
Expanded clay aggregate. Baked clay pellets are suitable for hydroponic systems in which all nutrients are carefully controlled in water solution. The clay pellets are inert, pH-neutral, and do not contain any nutrient value. The clay is formed into round pellets and fired in rotary kilns at 1,200 °C (2,190 °F). This causes the clay to expand ...
Lightweight expanded clay aggregate; Lutheran Evangelical Church in Africa—Zambia Diocese; Places ... Francine Leca (1938-2024), French surgeon and professor;
This was the case, for example, with the patent for the manufacture of lightweight concrete slabs, which Lemvigh-Müller & Munck A/S acquired in the mid-1930s. In 1939, A/S Dansk Betonklinker was founded, and the first rotary kiln in Sydhavnen began firing the product that was to become success under the name LECA (Light Expanded Clay Aggregates).
The expanded clay is obtained by the heating of different types of clay, at a temperature of approximately 1200 °C, using a rotary kiln. The principal characteristic of the expanded clay is to have a density three times smaller than normal aggregates. Usually, the density of this type of clay is 350 kg/m 3. [1]
In a study comparing lightweight expanded clay aggregate (LECA) and expanded vermiculite (EV), two materials used to make concrete, to a mycelium grown brick, the mycelium grown brick was found to be a better insulator. [13] These results are similar when comparing a different mycelium based composite with extruded polystyrene.
Expansive clay is a clay soil that is prone to large volume changes (swelling and shrinking) that are directly related to changes in water content. [1] Soils with a high content of expansive minerals can form deep cracks in drier seasons or years; such soils are called vertisols .
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