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Autoclaved aerated concrete, also known as AAC, is a type of precast concrete composed of natural raw materials. It had been initial developed in Sweden within the 1920s. Once Associate in Nursing designer initial combined the traditional concrete mixture of cement, lime, water, and sand with a tiny low quantity of metallic element powder. The metallic element powder is an Associate in Nursing enlargement agent that causes the concrete to rise, somewhat like dough. The result's a concrete that consists of virtually eighty percent of air. AAC concrete usually is created into blocks or slabs and is employed to develop mortared walls like that used for traditional concrete block construction.
Autoclaved aerated concrete begins with the same process used to mix all concrete: Portland cement, aggregate, and water are combined to form a slurry. Upon introducing aluminum as an expansion agent, air bubbles are presented throughout the material, generating a lightweight, low-density material. The wet concrete is shaped into shapes mistreatment forms, then withdraw slabs and blocks once partly dried. The unit's area unit then touched to Associate in Nursing autoclave to fully solidify underneath heat and pressure, which takes solely eight to twelve hours.
AAC concrete unit area unit extremely feasible and maybe cut and trained with standard woodwork tools, like band saws and standard power drills. Because it is lightweight and relatively low-density, the concrete must take tests for compressive strengths, moisture content, bulk density, and shrinkage.
It performs well as thermal and sound insulation because of its aerated structure and distinctive combination of thermal insulation and thermal mass. AAC is relatively easy to work with since it can be cut and shaped with hand tools or even woodworking tools.
The block's size is stringent and is usually placing in a thin layer of mortar with a toothed trowel. Wall panels are reinforced and mechanically fixed. AAC also can use in panel kind for floor and roof construction. It has a long life, and no toxic gas will generate after being placed in place. It is lightweight, non-burning, is an excellent fire barrier, and can support a considerable load.
Clear advantages of autoclaving aerated concrete are listed below.
The test proves that cement bonding can make the wall full of water without making a waterproof finish. Behind the wall can be kept dry, there is no trace, and there will be no condensation droplets on rainy days. Wallboard is a waterproof board with good waterproof and moisture-proof performance and can use in wet areas such as kitchens, bathrooms, and basements.
The cement fiber and internal components of the lightweight energy-saving wallboard have good sound insulation effects. The sound insulation of 90mm thick wall panels is 43db. Its sound insulation effect meets the sound insulation requirements of residential buildings, which is much higher than that of other brick masonry panels.
Lightweight energy-saving wall panels are fully working, assembled, and constructed, and the wall panels can cut to adjust the width and length at will. During the construction process, the transportation is simple, the stacking is sanitary, and no slurry is required. The construction period is significantly shortened; the material loss rate is low, and reduce construction waste.
Composite wallboard consists of vermiculite, high-purity quartz powder, inorganic fiber, and plant fiber cured by high temperature and high-pressure steam. It has a useful heat insulation function and makes the indoor environment more comfortable.
Composite wall panels can be directly nailed or unfolded bolts to hang heavy objects, such as air conditioners, with a single hanging force more significant than 45 kg. The wall panels are smooth and do not generate dust, and can be directly pasted with ceramic tiles, wallpaper, wood veneers, and other materials for finishing treatment.
75mm thick lightweight energy-saving wallboard is equivalent to 1/7 of the weight of 120mm thick masonry, which reduces the structural cost and expands the use area. The construction is convenient and straightforward, reducing labor intensity, speeding up the construction progress, saving 15-30% of the total project cost, and realizing different customers' requirements for modern buildings' indoor and outdoor environment.
Of course, the advantages mentioned above are significant, but they are inevitably too familiar and belong to the industry's general knowledge that everyone knows. Speaking of the most critical reasons to choose AAC, the specific content depends on the following four points.
AAC's magic comes from airtightness, pest resistance, longevity, ease of use, instability, speed, and won't even need to mention fire resistance. All of this in one material. I'll start with pest resistance.
Roaches and other insects cannot eat it, get through it, build nests in it, or travel inside its walls. Termites could not care less for it. As most people have experienced a pest problem, this problem we are talking about here is not the one you see. It's the ones in the walls that make pests more. An adequately built AAC building is almost airtight out of material pests cannot or will not use for their nesting or travel. Building an apartment building out of this stuff can prevent cross-contamination of pests like roaches, which love to use walls for their nests. Still, the fact that the walls have minimal voids means that pests have few places to hide, and extermination actions are highly effective.
This material is fascinating in areas with serious pest problems such as Florida, Georgia, Alabama, Louisiana, and Texas.
The number one factor for insulation is not the R-value; it is airtightness. It's why to require near-complete airtightness and look at houses with infrared to find air leaks. These houses need an air exchange system, or they are too airtight for people to live there. It doesn't matter if you have R45, you can leave all the doors and windows open. That is AAC's unique ability. When used correctly, just its regular use, AAC results in a nearly airtight building by default. Its smooth walls make it highly insulative without thermal bridges as well.
Most of the world's rest consider a 200-year-old house regarding an average age, even among wood constructions. Ancient buildings are significantly older than that, some going back one thousand or more years. US houses are old at 50 years and practically obsolete at 100. AAC designs to replace the wood construction of Europe. It is expecting to last more than 200 years when appropriately constructed with minimal maintenance. If you are worried about the energy used to make the building, please note that you will never make up the energy cost of building the house twice out of the wood inside of 150 years. A building that takes 150% more energy to produce still takes less power if you need to build an ordinary building over again over its lifespan.
This material starts with plans from the architect in Europe, who does not only by block but whole prefabricated walls and floors with cutouts for windows, doors, and stairs. Properly experienced 4-6 teams construct an ordinary two-story building in a month, including electrical and paint on the walls. They are so fast that there are special rules for inspections to make the process faster and cheaper. For builders who have the experience, AAC can be cut, tapped, routed, nailed, screwed, and anchored like ordinary wood or drywall. It is not as crucial to the second owner, but most people use construction or bridge loans to finance construction. Since these loans have higher interest rates and less favorable terms than a typical mortgage, construction within six months without paying any overtime can reduce construction costs by many thousands of dollars.
Many other materials do better than AAC in any one of these categories. Wattle and Daub houses, when raised off the ground and kept dry last thousands of years, have low energy use and cost in construction, and can be very airtight. However, they're not resistant to pest problems in the slightest degree.
The same goes for hay-bale construction. Wood construction is simple to figure with, will be quick; however, it has no fireplace resistance and has pests like termites that eat it. The drywall that goes on it is fast for making walls but acts as a superhighway and hiding spot for problems.
Concrete is airtight by default; however, it is more durable to figure with and takes loads longer because you can't build the following section till the primary has cured. It is pest-resistant, but not against rodents who like chewing to sharpen and wear down their teeth. It is also stable and crystalline, and transfers sound incredibly well.
Brick lasts a long time, but rodents like to chew and take more working hours to construct. It's not typically a hiding spot for pests, but it is hard to insulate without leaving voids, becoming a superhighway for the pests.
AAC is a collection of all these advantages in one, which is what makes it outstanding.