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Expanded Clay(LECA)is a lightweight ceramic aggregate produced from a special clay material expanding at high temperature.
Properties
Lightweight
Acoustic Insulation
Thermal Insulation
Pressure Resistance
Fire Resistance
Ecological & Environmental friendly
Concrete is generally used instead of gravel and pebbles. The solid waste of leca blocks, varies in color, usually black, and the matte surface is smooth. The internal structure is fine honeycomb.
According to the density, they are divided into three types: general density type, ultra-light density type, and optical density type. It has high strength and is used for insulating concrete or reinforced concrete structures. The price is more reasonable.
High-quality leca blocks cost affects project investment and operating costs. Although cheap natural materials are used for filter media, investment can be saved, but the properties such as density and fluidization rate are not suitable for backwashing, which may increase energy consumption and affect operating costs.
Some synthetic filter materials have good performance but are costly, price is too high. Therefore, the choice should take into account both performance and price.
The nitrification function of the biological aerated filter is the best when the particle size is 2-4mm.
At present, the particle size of the filter material commonly used in the biological aerated filter is 3-6mm, and the thickness of the filter layer is 3-4mm.
The clay pebbles/ leca is a kind of light artificial particle with unique performance, which is widely used in the preparation of high-rise building structure concrete, roof slope finding, thermal insulation, sewage treatment, landscaping, soilless cultivation and other fields.
It has a proper packing density of the filter material, and the layer voids are evenly distributed, making backwashing easy, with low backwashing consumption, small water consumption, small water head loss, and no material leakage during backwashing.
The high-quality have overcome the shortcomings of backwashing being difficult to control and running out of materials. It adopts good particle size distribution, strong dirt holding capacity and high utilization rate of filter material. The water head increases slowly, the operation period is long, and the water production is large. The concrete of clay pebbles/ leca blocks is better than ordinary concrete in acid, alkali corrosion and frost resistance.
For the concrete of No. 250 fly ash clay pebbles/ leca block, the strength loss of 15 freeze-thaw cycles is not more than 2%. In 1976, relevant departments conducted actual measurements on the concrete projects of leca blocks built since 1985. The results showed that no matter whether it was prefabricated or cast-in-place, indoor or outdoor, the steel bars contained in them were not corroded. The depth of carbonization is generally not more than 30 mm, and the strength can continue to grow in the later stage. It can be seen that the concrete of clay pebbles/ leca blocks is an excellent building material and should be vigorously promoted.
Toilets backfill clay pebbles/ leca is a special building material, which is widely used in toilets and places where water is frequently used.
First of all, in terms of its weight, it is much lighter than the commonly used construction waste backfills materials. At the same time, it is much more convenient to use and will not cause any pollution or damage to the environment.
Secondly, even its water absorption and dirt absorption ability are also excellent, which virtually ensures the cleanliness of the bathroom environment. In fact, there are many friends around us who are curious when they first learned about the clay pebbles/ leca backfilling in the bathroom.
First of all, in order to ensure that the water seepage from the upper layer of the waterproof layer will not spread to the surroundings, it is necessary to make waterproof coatings on both sides, both the upper and lower sides, and it must be connected with the wall. The height of the wall should be 40 meters higher than the upper edge of the caisson. cm or more.
Second, use concrete as a partition overhead, and divide the caisson into several 400×400 grids. Many people do not see the importance of such a load-bearing partition. In fact, this measure cannot be ignored. It can prevent the concrete above from falling Otherwise, it may cause the bathroom floor to sink, crack and leak after a few years.
Third, the next step is filling. Fill the moisture-proof ceramic particles into the grid, and don’t press it too tightly, because its function is not load-bearing but sound insulation and filling.
The fourth is to arrange a layer of 30 cm × 30 cm steel mesh composed of steel bars with a diameter of about 10 mm on the grid to ensure the firmness and uniform stress of the clay pebbles/ leca concrete layer.
Finally, the concrete layer is rammed, and the vibrating pump is added for construction, and the fine stone concrete with a thickness of 10 cm is leveled. This layer still needs to be made with a drain slope, and then waterproof materials are made twice, and it is done together with the wall. After it dries up, it needs to be brushed with plain grout to protect it.
In fact, the process of backfilling the bathroom floor with clay pebbles/ leca is not very complicated. As long as some key parts are done, the effect will be achieved. At the same time, clay pebbles/ leca is an environmentally friendly material that can be recycled and reused, and it can also play a role in environmental protection.
Lightweight clay aggregates can be used to prepare CL2.5-CL30Mpa lightweight aggregate concrete with a density less than 1600 kg/m3.
The lightweight blocks produced with lightweight clay aggregates have excellent properties such as energy saving and environmental protection, light weight and high strength, sound insulation and heat insulation, fire resistance and moisture resistance.
The lightweight wallboard produced by lightweight clay aggregates has excellent properties such as light weight, high strength, heat preservation, heat insulation, sound insulation, fire resistance, good moisture resistance, earthquake resistance, impact resistance, and small shrinkage.
It has heat insulation effect when used for roof insulation and slope finding; good integrity, easy construction; high compressive strength; it can be used for a long time, the roof can bear load, and the reinforced concrete structure does not need to find slope, and drainage slope can be laid according to the requirements of use. Greatly facilitate design and construction.
The use of clay aggregates in the cushion can improve the thermal insulation, heat insulation, sound insulation and bearing capacity between floors; it can facilitate the layout and installation of pipelines in the ground. Used as a moisture-proof layer, it can also prevent the floor from regaining moisture and keep it dry. It is very beneficial to protect various wooden floors and plastic panels from deformation and fading, and to prevent moisture and water in the basement.
The use of clay aggregates in the roof garden can reduce the load of the floor, protect the soil from being lost with water, quickly dredge the accumulated water, and maintain the supply of soil moisture and fertilizer when it is hot and dry.
Ceramic materials are used in soilless cultivation/ hydroponics of potted flowers and gardening, which can not only retain water and fertilizer, keep the soil loose for a long time, prevent soil compaction, but also be clean, hygienic and beautiful.
clay aggregates can be used as a biological carrier in sewage treatment, and can filter impurities in sewage, and can absorb oil and harmful substances.
clay aggregates concrete has been widely used in various types of prefabricated and cast-in-place concrete projects in industrial and civil buildings (such as prestressed and non-prestressed, load-bearing structure or enclosure, heat insulation or impermeability, static load or dynamic loaded). clay aggregates can also be used in other building materials such as pipeline insulation, furnace insulation, cold insulation, sound insulation and sound absorption; it can also be used as soilless foundation bed materials and water filtration materials in agriculture and gardens.
It has been a long time since the appearance of building material clay aggregate, and now its application is very extensive. It has been proved by decades of production practice at home and abroad that according to different resource conditions in various places, clay, shale, fly ash or other solid materials can be used respectively. Waste production of clay aggregate.
According to different uses and market needs, clay aggregate products with different bulk densities and particle sizes can be produced (ultra-light clay aggregate, clay aggregate for structural insulation, clay aggregate for structure), and clay aggregate for special purposes, such as high temperature resistant clay aggregate. Granules, acid-resistant clay aggregate and flower clay aggregate, etc.
Utilizing these excellent properties of clay aggregate, it can be widely used in building materials, horticulture, food and beverage, refractory and thermal insulation materials, chemical industry, petroleum and other departments. The application fields are becoming wider and wider, and are still expanding.
The history of human civilization changes includes numerous changes in building materials, and every progress embodies human wisdom.
It is precisely because of people’s complex of Qin bricks, Han tiles and tiles for thousands of years that this vast land is riddled with holes, reduced cultivated land, soil erosion, and ecological environment damage. “But save a square inch of land and leave it to your descendants to cultivate.” This is a helpless cry.
We clearly see that with the rapid development of cities, various types of construction waste are also increasing, and “garbage siege” has become an unbearable burden on the development road of many cities. In order to change this situation, during the “Twelfth Five-Year Plan” period, the state promulgated a mandatory standard for building energy efficiency to reach 65% nationwide, but very few lightweight wall materials on the market meet this indicator.
Therefore, we took the lead in starting the resource utilization of construction waste. Scientific and technological research, departmental linkage, and pilot projects first, use urban domestic sludge and river and lake sludge, construction waste, factory pulverized coal powder and other materials to obtain a low-cost, low-density, high-strength, low thermal conductivity, and corrosion-resistant material through expansion.
Strong sludge clay aggregate is used as aggregate, and the traditional chemical foaming method is improved to a physical foaming method to develop a self-insulating masonry material for green building energy saving. The block combines the advantages of clay aggregate and reinforced foam concrete, which makes it have light density, high strength, excellent heat insulation performance, small shrinkage, low water absorption and impermeability compared with general foam concrete self-insulation blocks. Strong, good frost resistance, excellent fire resistance and durability, good sound insulation and sound absorption effect, and has good shock absorption and shock resistance.
In the production process, a fully automatic frequency conversion numerical control cutting system is used to ensure the accurate size of the product, which indirectly improves the quality of the wall, so that the wall made of this kind of clay aggregate reinforced foam concrete self-insulating block has high later strength and the same service life of the building. Significant advantages. The green building using this product has huge economic and social effects, the building load is greatly reduced compared with ordinary buildings, and there is no need for internal and external wall insulation and waterproofing, reducing thermal bridges and cold bridges. Especially suitable for use in hot summer and cold winter regions.
1. Clay aggregates or ECA is light in weight: the thickness of the bathroom with sunken design is generally 400mm-450mm; if the material is heavy, it will cause cracks in the floor, which is not good for waterproofing. The use of clay aggregates or ECA is to take full advantage of its light weight.
2. clay aggregates or ECA has moisture absorption: There are micro-porous clay aggregates or ECA particles inside the clay aggregates or ECA, which can achieve the effect of moisture absorption, which is undoubtedly beneficial to the environment of the bathroom.
3. clay aggregates or ECA is easy to maintain: because it is easy to excavate, it is more convenient to construct than filling with other materials during maintenance.
4. In addition, other characteristics such as strong adsorption and interception ability of clay aggregates or ECA, good physical, chemical and hydraulic properties are all suitable filling materials for the specific environment of the toilet.
Backfill clay aggregates or ECA is used for high-rise building structure concrete, the top roof has good thermal insulation effect, and is packed in woven bags. It can be used in civil engineering construction, preparation of various concrete, roof insulation, moisture-proof insulation of the ground floor of buildings, anti-seepage moisture-proof insulation outside the walls of underground buildings and under the ground, soilless cultivation (hydroponics), sewage filter materials, etc. clay aggregates or ECA is widely used in planted roofs (underground car parks) as a drainage material. Used in high-rise buildings, long-span buildings; soilless cultivation (hydroponics), bridges, sewage treatment, etc. have unique functions
clay aggregates or ECA has:
1. Small density and light weight
2. Heat preservation and heat insulation
3. Good fire resistance
4. Good shock resistance
5. Low water absorption, good frost resistance and durability
6. Excellent impermeability
7. Excellent alkali-aggregate reaction ability
8. Strong adaptability
Lightweight expanded clay aggregate is a relatively popular material. It can not only be used to plant plants and flowers, but also can be used to backfill buildings, so its performance is still good. So, what about the specific performance of clay pebbles? The editor of clay pebbles will take you to understand it together today.
First of all, the frost resistance of clay ball is very good, which can be regarded as a great advantage of it! The main reason is that it has good anti-permeability, so clay pebbles is used for construction in winter, which is relatively reliable. On the other hand, its earthquake resistance is also good. After the earthquake, many buildings collapsed, but the LECA balls building is still very complete, so it is relatively earthquake-resistant, so it should be widely used. People love it There is also a reason.
In addition to the above two properties, there is another point, that is, the performance of leca aggregate is stable and will not easily deteriorate. This is very practical, because it can be used for a long time!
Clover Industrial