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?what is leca 

 .Leca instands for : Light Expanded Clay Aggregate

LECA consists of small, lightweight, bloated particles of burnt clay. The thousands of small, air-filled cavities give LECA its strength and thermal insulation properties. The base material is plastic clay which is extensively pretreated and then heated and expanded in a rotary kiln

 Finally, the product is burned at about 1100 °C to form the finished LECA product Light expanded clay aggregate is producing in more than 20 countries with different brands name,Some countries which produce aggregate with almost the same industrial way are as

Italy, Denmark, switzerland, Norvey, Germany, Finland, Portugal, U.K, and Iran with brand of Leca

Russia, Poland, Sweden,China, with the brand of Keramzite. South Africa with the brand of Argex. Spain with the brand of liapour

Entirely Natural Product

LECA is an environment-friendly, entirely natural product incorporating the same benefits as tile in brick form LECA is indestructible, non-combustible, and impervious to attack by dry-rot, wet-rot and insects

Natural Building Material

.LECA is a natural material and a LECA building is a healthy building, so that  is Leca  has been used in competition projects for allergy-friendly, healthy homes

Used as a thermal-insulation material in houses, LECA has been saving energy for more than 50 years, and is now a standard component in low-energy development projects all over the world

 

Aggregates

 

Leca aggregates in Iran are presented in various sizes. Four usual gradations are 0_4 mm, 4_10 mm, 10_25 mm, 0-25 mm. Leca bulk dried density and their applications fordifferentgradations illustrated in table below

   
density leca gradation leca wide applicability
510kg/m³  0-4mm  leca Light Weight Concrete,Light Weight Block, Prefabricated Panels & Slabs.Light Filler, Leca Mortar and Water Purification System.Agriculture & Aquaculture
320kg/m³ 4-10mm light Weight Concrete, Light Weight Block, Prefabricated Panels & Aquaculture, Ornamentation
250kg/m³ 10-25mm light Weight Filler Concrete, Sewage System.Landscaping, Agriculture & Aquaculture, Drainnage
270kg/m³ 0-25mm floor & Roof Sloping, Light Weight Filler, Road Construction 

 

 

Flooring and roofing

:Slopping drainage of floor and roof

For it’s lightness and easy accomplish , Leca is the best construction material for flooring and roofing. In this Way, first, aggregates are wetted about 3 liters of water per each 50 liters of Leca up to color of Leca become dark brown. Then for each 100 Kg Leca, about 16 Kg cement is added to mixture for mixing or any other convenient way. After that, mix color becomes dark gray and shiny. At the end, the mixed

which is obtained, is poured in the place and leveled. For Prevention of drying, it is most regularly watered or covered by a plastic sheet

 

If Leca is previously moistured and leveled in floor, Pour 12 liters of cement slurry (60 liters water per 50 Kg Cement) on each square meter of surface. In this method, 6 to 7 Square meter is prepared in one step .It is cured as mentioned above

 

 

Agriculture

:Leca prepares the best convenience bed for growth of plants due to

Ventilating of the soil and root, preventing soil from evaporation and saving water for sponge-like body of aggregate, water feeding adjustment, lightness, insulation, chemically neutral, environment-friendly, cleaner than soil, and no pestilential effects on solil or plants 

                                                                                    

?What is the benefit of Leca aggregate for Landscape area and how we can improve our building

Instead of approximately 1.8 ton/m3 sweet soil can be used 1.1 ton/m3 mixed Leca and sweet soil or sometimes less than it, (depends on the Leca percentage) therefore more than 60% can be reduce imposed load

.Obviously the thickness of slabs, reinforcement and concrete will be reduced accordingly

 The earthquake loads depends on weight of building, therefore according to the imposed load reduction the applicable lateral load will be reduced

Transportation, adjustment and up loading and off loading of this material is easier than heavy material

 The root of tree or flowers can easily move and grow at lightweight soil and aggregate

 The Leca Aggregate manufactured at some 1100 degree temperature, therefore it not taints the soil and there are not anything to have inappropriate effects for plants

The pH is ≈ 7.1 therefore is inactive for soil

The Leca aggregate doesn't decay like normal soil in long saturate condition which is considered a vital factor for plants

Leca aggregate can improve a lot water drainage of Sweet soil which it is very usable in the Gulf countries when heavy rain

 Leca aggregate can stabilize the soil against the strong wind of Gulf countries

 With Leca aggregate we can improve protect the lower layer against high and low temperature and consequently roots of plants remain in wet condition

?What is hydroponics

The word “hydroponics” derivates from  the  Greek  words  for  water  and  work  (ponos). The literal translation is “let the water do the work”.  Modern  applications  began  in 1930`s.  Today hydroponics commonly refers to growing plants without soil. Plants do not need  soil, they  need mineral elements, water, air and light. In hydroponics the mineral elements are added to  water to form a nutrient solution which feeds the plants. This technology has a tremendous future. One day our food may well be  grown  without soil.  Thousands of  commercial  greenhouses  around  the world use hydroponic systems for tomatoes, lettuce and cucumbers and other vegetable crops of which many products will be found on your supermarket shelves. There are two main categories of hydroponic system: active which uses a pump to irrigate the gardens and passive that depends on gravity flow, capillary action or weak absorption