sustainability of autoclaved aerated concrete (ACC)

Engineering and Construction
Pages 4 (1004 words)
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Name Tutors name Course Date Autoclaved aerated concrete (“AAC”), though not much known in the United States, is now one of the many building products being touted as “green” or “environmentally friendly.” This paper briefly examines the advantages and disadvantages of building with AAC, paying specific attention to the aspects of the product that may lend to its designation as a sustainable building material.


AAC is used in a large number of commercial, industrial, and residential applications. This material has been used in Europe for many decades. Also leading in the use is Middle East followed by South America and Australia. Autoclaved aerated concrete is a precast product manufactured by mixing silica, cement, lime, water, and aluminum powder, and pouring it into a mold. With respect to reinforced AAC products like roof panels, lintels, steel rebar or mesh is also placed in the mold. When added to the concrete, the aluminum powder reacts with the silica, forming millions of microscopic hydrogen bubbles (Shi and Fouad 105). The hydrogen bubbles make the concrete to expand relatively five times its original volume. The hydrogen then evaporates, leaving a tightly closed-cell aerated concrete. The now aerated concrete is cut into blocks or panels which are then steam and pressure-cured in an autoclave. Unlike traditional concrete masonry units (“CMU”), AAC is a solid material system with combined insulative and structural components, and is there in a variety of products that can be used in both load and non-load-bearing applications. ...
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