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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
Horticulture Grade Perlite – Horticultural grade perlite is derived from a naturally occurring, volcanic rock. When furnaced at high temperatures, perlite “pops” and expands up to 10 times its original volume. The resulting, lightweight particles are made up of microscopic spheres with a porous, irregular surface that stores moisture and promotes plant growth.
Our perlite products have proven themselves as a consistent growing media for horticulture because they improve the characteristics of every organic material they are mixed with including peat moss, compost, bark, coir, or in native soil. Horticultural grade perlite is stable and will not degrade or compact over time. It maintains consistent aeration and drainage for plant roots and will not decompose or deplete nitrogen levels in the soil.
Adding perlite to soil and growing media lightens the soil and introduces pore spaces that allow air and water to penetrate the root system. Excess moisture is permitted to drain out and maintain balanced air and moisture conditions which contribute to healthy biological and microbial activity, and minimize the chances for rot.
Uses – Propagation of seedlings and cuttings – Soil conditioning – Hydroponics – Roof deck gardens and eco-roofs – Nursery stock – Hanging baskets – Turf enhancement – Newly planted trees and plants
Leca clay balls expanded clay pebbles is a kind of lightweight aggregate produced by foaming in a rotary kiln. It has a spherical shape, a smooth and hard surface, and a honeycomb inside, which has the characteristics of low density, low thermal conductivity and high strength. In the refractory industry, leca clay balls expanded clay pebbless are mainly used as aggregates for heat-insulating refractory materials. The bulk density of the leca clay balls expanded clay pebbles itself is less than 1100kg/m3, generally 300-900kg/m3. The density of concrete made of leca clay balls expanded clay pebbless as aggregate is 1100-1800kg/m3.
The corresponding compressive strength of leca clay ball concrete is 30.5-40.0Mpa. It is hard on the outside, but there are many micropores inside. These micropores give leca clay balls light weight properties. The concrete density of No. 200 fly ash leca clay balls expanded clay pebbles is about 1600kg/m3. At present, the sand of my country’s leca clay balls expanded clay pebbless is mainly used for petroleum proppant, and it is also one of the sand varieties of leca currently in demand, also known as sand for oil fracturing proppant leca.
The concrete of ordinary fly clay ball or the clay aggregate blocks integrate heat preservation, earthquake resistance, frost resistance, fire resistance and other properties. Especially the fire resistance is more than 4 times that of ordinary concrete. For the same refractory period, the thickness of the concrete plate of the expanded clay pebbles is 20% thinner than that of ordinary concrete.
In addition, expanded clay pebbless can also be used to prepare refractory concrete with a refractoriness below 1200°C. At a high temperature of 650 ° C, the concrete of expanded clay pebbles can maintain 85% of the strength at room temperature. Ordinary concrete can only maintain 35% to 75% of its strength at room temperature.
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.
First: The quality of the products, this is an important, so for us, generally the clay pebbles/ leca you see is the picture of the sample, the product quality is good, and the size of the specification is not much different, but when you see the bulk cargo, it is different. The size is uneven, and the surface will be broken when pinched. These are all defective clay pebbles/ leca. At this time, you should compare more manufacturers and choose some powerful product. It is very important for a manufacturer to have perfect inspection and testing.
Sceond: After purchasing, you need to check the quantity you received is sufficient or not. Some manufacturers ship less than what you want. When your cargo is delivered, pay attention to whether the quantity is enough. This can be avoided.
Third: Perfect after-sales service. A perfect after-sales service for building materials, such as building materials, can save you from such trouble when you buy again. A good clay pebbles/ leca company should have perfect after-sales service, so that you can buy with confidence.
Last: When buying clay pebbles/ leca, you can inquire about several companies and want to make comparisons. Sometimes you get what you pay for, cheap ones are maybe good, but expensive ones must have expensive benefits. We have seen many clients to compare by the pictures, the difference can be seen at a glance. The cheap one will be broken when pinched. If you use that kind of leca for construction, you must be afraid of it, its compressive performance is too poor, and the later renovation and maintenance will not work.
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. Concrete mixing
(1) When mixing high-performance clay aggregate light aggregate concrete, the mixing personnel are required to feed materials strictly according to the mix ratio.
(2) Timely measure the water content of the sand, adjust the water consumption of concrete mixing, and change the slump of self-compacting concrete must be carried out by on-site technicians, and it is strictly forbidden to increase the water consumption at will;
When mixing clay aggregate concrete, the optimal watering time is also closely related to the order of feeding materials. If a self-falling mixer is used for mixing, the hopper is raised and the water is released in time when the material is just fed, so that the mixing time can be shortened, the mixing is easier, and it is easy to mix evenly. If you add water first or later, it is not easy to stir evenly. Therefore, it is very important to choose the best time to add water. Because clay aggregate has strong water absorption performance, when preparing concrete, the total amount of water added is larger than that of ordinary concrete, and the water absorption of clay aggregate for 15 minutes is generally increased.
(3) Concrete mixing time The mixing time of clay aggregate concrete should be longer than that of ordinary concrete. If a forced mixer is used for mixing, the concrete mixing time should be strictly controlled at 120~160s. If a self-falling mixer is used, the mixing time can be controlled at 160~240s to ensure that the concrete mixture is evenly mixed and the work-ability of the mixture meets the aforementioned quality requirements.
(4) Requirements for concrete mixture Control the concrete slump to (160+-20)mm. In order to ensure the pouring quality, strength and durability of concrete, it is required that the concrete mixture does not bleed and has good work-ability.
(5) Selection of clay aggregate concrete mixer Since clay aggregate is light and easy to float, it is not easy to mix evenly, so it is best to choose equipment with better mixing performance, such as forced mixer.
(6) When mixing clay aggregate concrete, there are currently two ways to add water.
a. Pre-sprinkle the clay aggregate with water until it is almost saturated, then mix the ingredients and mix, and only add the effective amount of water during the formal mixing. The advantage of this method is that the combination is relatively stable; the disadvantage is that the concrete is prepared after the clay aggregate absorbs water, and the strength of the concrete decreases. .
b. The clay aggregate in the natural dry state is directly used for batching and stirring, and the total water consumption is added to the formal stirring. The advantage of this method is that the strength of the prepared concrete is high, and the disadvantage is that the quality of the mix is not easy to stabilize.
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