Autoclaved Aerated Concrete 2020

Marc Strewart
10 min readMar 4, 2020

Autoclaved aerated concrete (AAC) is formed with excellent aggregates, cement, A growth agent that causes the contemporary combination to rise like dough. In fact, this sort of concrete contains eighty % air. within the producing unit wherever it is created, the fabric is shaped and withdraw exactly dimensioned gadgets.

The global autoclaved aerated concrete market was valued at USD 3,840.64 million in 2018 and is expected to reach USD 6,658.37 million by 2026 at a CAGR of 7.12 % during the forecast period, 2019–2026.

Cured blocks or panels of autoclaved aerated concrete area unit joined with skinny pad mortar. parts are often used for partitions, floors, and roofs. The light-weight cloth offers first-rate sound and thermal insulation, and like all cement-based altogether materials are strong and fireside resistant. so as to be sturdy, AAC implies some variety of applied end, in conjunction with a polymer-modified stucco, flavorer or artificial stone, or siding.

Key aspects of AAC, whether or not or not planning or constructing with it, area unit outlined below:


Autoclaved aerated concrete combines insulation and structural capability in a very single material for partitions, floors, and roofs. Its lightweight weight/mobile homes create it straightforward to scale back, shave, and shape, take delivery of nails and screws pronto and permit it to be routed to form chases for electrical conduits and smaller-diameter plumbing runs. This offers its layout and creation flexibility, and also the potential to form clean changes within the sector.

Durability and dimensional stability. A cement-based altogether material, AAC resists water, rot, mold, mold, and insects. Units area unit exactly formed and comply with tight tolerances.

Fire resistance is splendid, with eight in. thick AAC reaching a 4-hour rating (actual performance exceeds that and meets check wants for up to eight hours). And because of the actual fact, it’s miles flame-retardant, it’ll not burn or provide off toxic fumes.

The lightweight weight approach that R-values for AAC area unit corresponding to typical frame walls, but they need higher thermal mass, offer airtightness, and as simply noted, are not flammable. That lightweight weight, in addition, provides an excessive sound reduction for privacy, every from out of doors noises and from completely different rooms while used as inside partition partitions.

But the fabric will have some limitations. it is not as wide on the market as most concrete merchandise, although it’s going to be shipped anyplace. If it’s to be shipped, its delicate weight is advantageous. as a result of its miles decrease strength than most concrete merchandise or structures, in bearing applications, it ought to unremarkably be reinforced. It additionally needs a protective end providing the material is porous and would go to pot if left exposed.


Both blocks and panels area units to be had. Blocks area unit stacked equally to ancient masonry, but with a thin-bed mortar, and panels area unit stood vertically, spanning full-story heights. For structural wishes, grouted, strengthened cells and beams area unit set within the wall section. (Concave depressions on vertical edges will produce a cylindrical middle between two adjacent panels.) For ancient applications, a vertical cellular is found at corners, on each side of openings, and at 6- to 8-foot spacings aboard a wall. AAC averages close to thirty-seven pounds per capacity unit (PCF), thus blocks could also be positioned by suggests that of hand, but panels, because of their length, typically need a little crane or completely different piece of apparatus.

>Panels amplify from ground to pinnacle of the wall:

>Height: up to twenty feet

>Width: twenty four inches

>Thickness: half dozen, 8, 10, or twelve inches (four inches thick inside

>Blocks area unit giant and lighter than ancient concrete masonry:

>Height: eight inches typical

>Width: twenty four inches long

>Thickness: four, 6, 8, 10, and twelve inches

A most well-liked 8-by means of-eight-through-24 in. the unit weighs close to thirty-three pounds;

Specialty shapes:

U-formed bond beam or header blocks area unit to be had in thicknesses of eight, 10, and twelve inches.

Tongue and groove blocks area unit to be had from a couple of makers and these be a part of adjacent units without mortar at vertical edges.

Cored blocks on the market for growing vertical strengthened grout cells.

Installation, Connections, and Finishes

Due to the similarity to ancient concrete masonry, autoclaved aerated concrete units (block) could also be simply established via concrete masons. Sometimes, carpenters get disturbed in installation. Panels area unit heavier attributable to their length and need employing a crane for placement. makers provide coaching seminars, and it’s usually ok to possess one or 2 knowledgeable installers on little comes. betting on the kind of end selected, they will be directly adhered to or habitually connected to the face of AAC.


AAC_wallsFirst course is arranged and leveled. Blocks area unit stacked put together with a thin-bed mortar in a very strolling bond with at the smallest amount 6-inch overlap.

Walls area unit measured, leveled, and square with a rubber mallet.

Openings and odd angles area unit cut with a carpenter’s saw or sawing machine.

Reinforcement places area unit determined rebar placed, and grouting happens. Grout needs to be habitually vibrated to consolidate it.

Bond beams area unit positioned at the head of the wall and might be used for heavy fixture attachment.


Panels area unit placed one at a time, starting from the corner. Panels area unit set into a layer of thin-bed mortar and vertical rebar is attached to dowels extending up from the bottom before the adjacent panel is found.

A non-stop bond beam is formed at the highest, either with plyboard and AAC material or with a bond beam block.

Openings could also be precut or field cut.


Roof frame/framing is connected to a traditional pinnacle plate or cyclone straps embedded within the bond beam.

Floor framing is connected with most well-liked ledgers anchored to the facet of the AAC assembly contiguous to a bond beam.

AAC floor systems bear directly on prime of AAC partitions.

Larger structural bronze people area unit assault weld plates or bolt plates set into the bond beam.


AAC_finishStucco-kind finishes are made particularly for AAC. These polymer-modified plasters seal in opposition to water intrusion yet permit moisture vapor for breathability.

Conventional siding substances are automatically attached to the wall face. Furring strips must be employed if returned airflow of the siding material is desirable.

Masonry veneers can be without delay adhered to the wall face or can be constructed as hollow space walls. Direct-applied veneers are generally lightweight substances like a manufactured stone.

Sustainability and Energy Considerations

Autoclaved aerated concrete gives both cloth and performance factors from a sustainability perspective. On the cloth facet, it may contain recycled substances like fly ash and rebar, which may help make contributions to credits in LEED® or different green rating systems. Further, it consists of such a big quantity of air that it consists of much less raw fabric in keeping with quantity than many other building products.

From a performance perspective, the machine ends in tight building envelopes. This creates an energy-efficient envelope and protects against unwanted air losses. Physical checking out demonstrates heating and cooling financial savings of roughly 10 to twenty percent compared to traditional body construction. In always bloodless climates, the savings may be somewhat much less because this fabric has lower thermal mass than different varieties of concrete. Depending on the location of producing relative to the task web page, AAC can also make contributions to neighborhood materials credits in a few inexperienced constructing rating structures.


Manufacturing and Physical Properties

First, several elements are combined right into a slurry: cement, lime, water, finely ground sand, and often, fly ash. An expansion agent like aluminum powder is introduced and the fluid combination is solid right into a massive billet. As the slurry reacts with the growth agent to generate air bubbles, the combination expands. After its preliminary set, the resulting “cake” is wire reduce into precisely sized blocks or panels after which baked (autoclaved). The heat allows the cloth to cure quicker in order that blocks and panels preserve their dimensions. Reinforcement is located within panels previous to cure.

>AAC_floatingThis manufacturing method produces a lightweight, noncombustible material with the subsequent residences:

>Density: 20 to 50 pounds according to cubic foot (PCF) — this is light sufficient to waft in water

>Compressive electricity: three hundred to 900 pounds according to the rectangular inch (psi)

>Allowable shear stress: eight to 22 psi

>Thermal resistance: 0.eight to 1.25 in step with inch. Of thickness

>Sound transmission class (STC): forty for 4-inch thickness; forty-five for 8-inch thickness

Autoclaved Aerated Concrete

There isn’t any change association presently representing the Autoclaved Aerated Concrete industry. The manufacturing of AAC nonetheless exists in North America. We suggest you search the internet for supplier representatives that can assist you with capability product availability for your area.

AAC Projects

A Tale of Three Cities: The Residential Versatility of AAC

AAC_Dodson_100pxThe blessings of using autoclaved aerated concrete (AAC) are numerous. Perhaps in testimony to the versatility of AAC, the three residential projects defined right here are quite different — however, proportion a common subject of protection. A massive single own family home in a wooded area, whose construction is being managed by means of the owner himself; a modest single own family home on a wooded web page, designed through an architect searching for environmentally sound and healthy living; and a massive development along the Louisiana Gulf Coast requiring advanced weather resistance.

Handal Home, Maryland: Simplicity and Safety

Set in a southern Maryland woodland, this huge residence (6,800 rectangular feet) posed several production challenges. So the proprietor, who’s managing the construction himself, desired a simple system. That became out to be 12-inch AAC blocks. He wanted their thermal insulating and noncombustible properties to rise up to the home’s wooded area setting, which included cold temperatures and, potentially, fireplace hazards. The simplicity of AAC, he says, allows him, in a single step, to assemble a structural wall this is insulated, proof against termites, and geared up for finishing. He didn’t need to attach a siding product, preferring alternatively direct-implemented finishes: gypsum plaster for the interior and stucco for the exterior.

Dodson Home: Healthy and Serene

Some years ago, when architect Alice Dodson selected AAC to construct her own domestic, it changed into partly for health and environmental reasons. A long-time sustainability advocate, she was additionally already following Bau-Biologie. Relatively unknown inside the United States, but well installed in Europe amongst architects and health professionals, Bau-Biologie is building biology or constructing for life.

It resulted after fast production in post-conflict Germany caused what we now think of as sick building syndrome. So then, as now, she sought healthful constructing solutions. To that end, she decided on AAC blocks and panels to reap breathable masonry walls that emit no volatile organic compounds (VOCs). This creates an eco-friendly building, with a calming, quiet indoors. And with her firefighter husband concerned inside the construction method, having a noncombustible material became essential.

The AAC envelope additionally provides exact thermal mass and insulation. Thanks to a strength efficient envelope complemented by means of solar panels and a wood stove, gasoline bills all through the first year had been only $a hundred for the 4,000-square-foot domestic.

The home can live heat for two to three days even after a disruption in power. Dodson likes how the material can be sculpted with woodworking gear into numerous shapes and elements, like columns and fireplaces, and continues to be a proponent of AAC with clients, who admire its versatility and aesthetic capacity.

The Grove at Inlet Beach: Safety and Weather Resistance

This success story passed off due to destruction as a result of Hurricane Katrina. As the Florida Panhandle’s first all-AAC high-density residential improvement, The Grove at Inlet Beach is intended to resist destiny climate and safety challenges in its Gulf Coast environment. All walls, floors, and ceilings of these single circle of relatives residences are made with AAC panels and blocks. The outstanding fireplace rating (4 hours for 4 inches) became key to local zoning approval, and there are not any structural fireplace issues as a result.

When hurricanes arrive, these systems are prepared to meet 150 miles in keeping with hour (mph) winds (Category four), and with proper reinforcement, may be engineered to resist winds of two hundred mph or more (Category 5). AAC homes aren’t destroyed by means of floods, both: they resist growing waters, rot, mold, and mold and can be cleaned, repainted, and reopened to residents — no rebuilding necessary.

As if the safety and weather resistance weren’t enough to cause to pick out AAC for his own domestic, the developer anticipates saving 35 percent on his utility bills and 65 percentage on his insurance premiums.

The Comfort of Concrete

AAC_hotel_100pxSome visitors in a Georgia resort are sleeping better tonight way to autoclaved aerated concrete (AAC). About an hour outside of Atlanta, the site for the Forsyth, Georgia, Comfort Suites, a narrow lot adjoining to an interstate, posed a few demanding situations. And excessive land costs are making it increasingly not unusual to build on websites which have inherent demanding situations together with noise, unlevel terrain, or minimum set-backs. So developers became a concrete machine to help meet their desires for turning in a first-rate task — in this case, a strong, quiet, four-tale structure near a heavily traveled highway.

Read greater on AAC.


The listing of companies and information resources constitutes neither an endorsement nor recommendation with the aid of the Portland Cement Association (PCA). PCA disclaims any and all obligation for the choice of corporations indexed and the products they represent. PCA additionally assumes no duty for mistakes and omissions on this list.



Marc Strewart

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