Autoclaved aerated concrete blocks weigh 500-700kg/m3, which is 1/4-1/5 of clay bricks and 1/5 of most concrete. This is a lighter type of concrete. Compared with most brick-concrete structures, the self-weight is reduced by more than 40%.
AAC blocks have very low thermal conductivity, and the thermal insulation effect is 6 times that of clay and 12 times that of ordinary concrete. A 200MM thick block used for external walls can meet the strict requirements of heat preservation and energy saving without auxiliary insulation materials.
The sound insulation volume of the wall built by aac blocks can reach 30-50 decibels. The wall has the dual effect of sound insulation and sound absorption.
The autoclaved aerated concrete block is formed by foaming, and the internal pores are independent and closed, with a uniform size and diameter of about 1MM, which can effectively block water diffusion. And due to the use of mortar masonry, the thickness of the ash joint between the products is not more than 5MM, further improving the overall anti-seepage performance of the wall.
The autoclaved aerated concrete block itself is an inorganic material, a non-combustible material, and has excellent fire performance. The experiment proves that autoclaved gas block product is an ideal fireproof material, and the fire resistance limit of 10CM wall can reach more than 4 hours, which is widely used as a firewall.
As the AAC blocks are generally used for wall structure, the dimension accuracy is essential. The accuracy can reduce the trimming of construction and save motar and other finishing materials.
A: Siliceous materials: Fly ash / Sand /Tailings containing silicon
B: Calcareous material: Lime block + cement + gypsum
C: Gas former: Aluminum powder
Flyash or sand is first ground by ball mills and transferred to a slurry tank for later use. Crushed lime stones by jaw crusher are sent into a ball mill for fine grinding to make powder lime and storage in a silo. Aluminum powder is conveyed to a mixer to form a suspension with water.
The critical material fly ash is turned into slurry first. Fyl ash slurry, lime powder, and cement are measured separately and added to the pouring mixer for mixing. A certain amount of steam will be added when necessary to make sure the temperature for mixing reaches 40-45 ℃. The blending process lasts for 2-3 minutes. Before pouring, the aluminum suspension will be poured into the slurry and mixed for less than 40 seconds. The whole batching system adopts centralized computer control to realize automatic batching control, remote control, and fault diagnosis.
The well-stirred slurry is poured into the molds which are painted with oil in advance to prevent sticky. Bubbles are first eliminated after the pouring. The molds are transferred by a trolley to the pre-curing room which leaves time for the expansion of the slurry resulting in aluminum reacting with lime and water. It takes about 90-130 minutes with an automatically controlled temperature of 40-45℃.
When the slurry reaches strength, the mold will be moved out from the curing room. The crane hoist lifts up the mold and releases the green cake after a 90-degree tilting. Then the green cake is cut by horizontal and vertical cutting machines. Before going into autoclaves, it is hoisted to the turning and peeling device, and the bottom waste is recycled.
The hauling machine transfer and stack the cut green cake together with the side plate on the rails to enter the autoclave. The autoclave curing will last 8-12 hours to ensure the hardness and chemical properties of the final blocks.
The finished blocks out from the autoclave will be packed with waterproof materials and loaded on trucks for delivery.
The plant include all necessary equipment for the manufacturing of autoclaved aerated concrete blocks. Below are some key AAC block machines for sale. Other auxiliary machines are also provided to form an efficient AAC block plant. Don’t hesitate to contact us for more information.
Raw material processing section: jaw crusher, ball mill, storage silo, conveyor belt, bucket elevator, aluminum powder mixer
Dosing & mixing section: slurry tank, pouring mixer
Molding, rinsing & pre curing section: mold, trolley
Demolding & cutting section: crane hoist, cutting machines, overturning machine
Autoclaving section: autoclaves, rails and plates
Out of clave section: transfer machines, lifting machines, separating machines, packing machines, loading trucks
AAC block is a new type of building material that has many advantages over red clay and other concrete bricks. AAC is the short term for autoclaved aerated concrete. The blocks are treated with high-temperature steam in autoclaves to get the required strength and density with bubbles. The fast development of urbanization requests for more bricks for buildings. AAC blocks have promising market prospects, especially for their eco-friendly property and their high adaption to extreme hot weather conditions. Simply sum up, AAC blocks are ultra light-weight, porous, thermal insulated, and fire resistant. It can be nailed, sawed, or planed and has a certain earthquake resistance.
CNBM has years of experience in offering customized AAC plant solutions. Compared to a larger scale of the aac block plant, the mini AAC block plant has prominent features below. We will take the future development of the plant into consideration. When designing the plant, there is room for later upgrades.
01Less investment
The highlighted advantage of a mini aac block plant is its cost-saving on each circuit of building up a plant. For example, the number of equipment needed is less, the area required for the factory is less, and the power supply and human resource is also less than larger scale plants.
02 Easy management
The automatic mini AAC plant is easy to operate, manage, and maintain. An automatic batching system is adopted to improve the efficiency and accuracy of material feeding. The correct ratio and thorough mixing of ingredients are essential to the quality of aac blocks.
03Upgraded technology
The standard of the manufacturing process is the same as larger-scale aac plants. The world representative technology CNBM used is the only one named after a Chinese enterprise in the autoclaved aerated concrete industry.
04Environmental friendly
In an AAC plant, the raw materials and the end product are eco-friendly. Since the production capacity is lower than medium and large AAC plants, the carbon foot of a mini AAC plant is smaller.
Origin of Autoclaved Aerated Concrete
· AAC was first developed in Sweden in 1920s, when an architect Axel Eriksson first combined the conventional concrete mixture of cement, lime, water, and sand with a small amount of aluminum powder.
· In 1929, the world's first AAC plant was built in Sweden, then "Ytong" & "Siporex" two production process systems were gradually formed in northern Europe and several highend equipment suppliers appeared, and then AAC was gradually ...
AAC Initial Trial Production Period in China
· In 1958-1962, the Chinese Academy of Building Sciences organized experts to study and trial produce AAC.
· In 1965, the first AAC plant in China was built with Siporex technology, then China AAC industry entered a slow development period.
· In 1992, the State Council issued the notice on accelerating the innovation of wall materials and promoting energy-saving buildings, China entered the new wall materials era...
AAC Industry Emerging Period in China
· In 1995, Nanjing JT imported the second-hand equipment of Wehrhahn. Mr. Xu Shunwu, who was the engineer of Wuhan Building Materials Research Institute, upgraded the equipment to produce AAC smoothly.
· In 1996, China Xujian imported second-hand cutting machines of Siporex plant from Japan. Mr. Xu Shunwu was responsible for the overall design of auxiliary machines.
· In 2003, Yinghai Industrial Group imported the second...
AAC Rapid Development Period in China
· Attended the 6th & 7th International conference on AAC to give speech on behalf of China AAC industry and joined European AAC Association.
· Up to now, the AAC plants supplied by KEDA SUREMAKER have been installed all over 30 provinces in China and exported to Asia, Middle East, Europe, South America & other area of the world.
