Autoclaved aerated concrete

found: Work cat: Autoclaved aerated concrete : properties and structural design, 2005:p. 2 (Autoclaved aerated concrete (AAC) is a lightweight uniform cellular material first developed in Sweden in 1929, and based on a patented process by Johan Eriksson. ... Today, AAC is gaining rapid acceptance as a new building product in the U.S. as a result of the increasing importance placed on energy, since energy savings are realized both in the production process of AAC and in the thermal insulation properties of the AAC finished product)

found: Portland Cement Association WWW home page, Nov. 28, 2018cement & concrete applications/paving/buildings & structures/concrete homes/building systems for every need (Autoclaved aerated concrete (AAC) is made with fine aggregates, cement, and an expansion agent that causes the fresh mixture to rise like bread dough. In fact, this type of concrete contains 80 percent air. In the factory where it is made, the material is molded and cut into precisely dimensioned units. Cured blocks or panels of autoclaved aerated concrete are joined with thin bed mortar. Components can be used for walls, floors, and roofs. The lightweight material offers excellent sound and thermal insulation, and like all cement-based materials, is strong and fire resistant. In order to be durable, AAC requires some type of applied finish, such as a polymer-modified stucco, natural or manufactured stone, or siding)

found: Cement and concrete research, June 2008:pp. 766-767 (Capillary absorption of water and n-decane by autoclaved aerated concrete. ... AACs are generally manufactured from a mixture of finely ground silica sands, Portland cement, lime and water. Adding aluminium powder to the slurry before decanting the mix into a mould and allowing it to 'rise' in an oven develops its cellular or foamed character. After the slurry has achieved sufficient mechanical competence it is removed from the mould and autoclaved at about 180 °C for 10 to 16 h. The primary hydrated mineral is reported to be crystalline tobermorite 11Å. Numerous technical studies of the engineering properties of AAC have been reported, notably in a series of conference proceedings)

found: Songklanakarin journal of science and technology, Sept.-Oct. 2011:p. 555 (Autoclaved aerated concrete (AAC) is composed of cementitious mortar surrounding disconnected air voids and microscopic air bubbles. The air bubbles are the results of gas formed within the mortar. High temperature and pressure steam help to create this autoclave cured concrete, which is rapidly formed and has dense microstructures. However, the dense microstructures of AAC cause a disadvantage where fire resistance is concerned. The absence of voids, which relieves the internal stress, creates a major problem. This problem can be solved by adding fibers to the mixtures. For decades, fibers have been extensively used to improve ductility, reduction of spalling and cracking, and to enhance residual strength of concrete)

found: Research & development in material science, v. 1, issue 4, Oct. 2017:p. 1 (Sustainable construction using autoclaved aerated concrete (aircrete) blocks. ... Aircrete was ... first used in the late 1950's as an alternative to building with timber. Currently over 30 million m3 of the material is produced annually. In the United Kingdom it is used extensively by major house builders with block sales of approximately 2.9 million m3 per annum. It is so extensively used that aircrete (mainly medium and high density) now accounts for a third of all concrete blocks in the UK. Aircrete is also known commercially as AAC (Autoclaved Aerated Concrete), Celcon, Durox, Thermalite and topblock. Aircrete blocks are suitable as vertical load-bearing elements and provide the thermal insulation expected from typical UK wall construction. Aircrete blocks may also be used as non load bearing outer leaves of masonry walls, external walls and walls below ground level, where adequate care is essential to ensure their durability and protection from effects of the environment. The lightweight porous structure and consequent faster build-speed of Aircrete blocks mean even foundations can be constructed quickly, easily and cost-effectively handle creating an extremely effective moisture barrier with significant thermal insulation properties. Their porous cellular structure (porosity) and durability make them a recognized alternative in most below ground situations)