Nuts and Bolts of AAC Blocks Manufacturing

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Why there are more complaints of Cracks in Walls made with AAC Blocks : Drying Shrinkage During the manufacturing, when AAC blocks come out after autoclaving, they have high amount of residual moisture from 24 to 28%. (This is the reason most of the manufacturers do not despatch the blocks to the market as the strength of the blocks is less and they tend to chip or crack during loading and unloading of the blocks.) This residual moisture leaves the blocks predominantly in the first 48 hours. As the moisture leaves the blocks they shrink. Imagine we have got installed these blocks during a masonry wall within the primary 48 hours then the shrinkage happens inside the wall. The shrinkage may be a massive force which tears the wall vertically resulting into a crack at the centre of the length of the wall. On the other hand if the blocks are allowed to “dry down” for a period of 48 hours to 96 hours before they go in a masonry wall, then you will find that the cracks in your

 Autoclaved Aerated Concrete - Properties, Testing and Design (Kindle Edition) By S. Aroni    Book Description ‘BIBLE OF AAC’. Every AAC industry in the world and each professional in AAC must have this e-book in hand. This is a comprehensive guide to autoclaved aerated concrete (AAC) for civil engineers, architects, specifiers, industry professionals and manufacturers. It provides the code of practice for the structural use of AAC blocks and panels and provides designers with a complete guide to the structural use of AAC in structural applications in the large homes or buildings. Table of Contents Preface. Introduction. Part 1: Recommended practice Introduction. Production and structure of the material. Properties of the material. Structural design. Structural analysis of elements. Design of unreinforced masonry. Seismic design. Connections and fixtures. Non-structural performance design. Manufacturing control procedure. Execution of works and site contr

The primary purpose of the Autoclaving is to transform the green cake into white cake. This transformation takes place in autoclaves, where the green cakes are left for curing. The actual curing takes place by filling the autoclave with pressurised steam (saturated water vapour) supplied by the boiler. It is during this environment where the most reaction will happen between the sand or PFA and therefore the binding agents lime and cement. This reaction, which results in the forming of calcium silicate hydrates within the cellular concrete’s matrix, takes place in two reaction phases. In the first phase, a topochemical reaction takes place during which the lime and silica acid are the reactants. Water doesn't happen within the actual reaction; it’s only built into the new formulations that are formed. These reactions occur within the border areas of the raw materials, starting at the active spots (e.g. on the edges) of a crystal. The second phase of the reaction

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What is Quick lime or Burnt Lime? Burnt Lime also called as quick lime or calcium oxide is formed out of lime stone deposits or mines which are wide spread throughout India. The calcium oxide is extensively used as a mortar within the construction of building by mixing in with suitable proportion of sand and surkhee of burnt clay as aggregate. It is also used for white washing of homes and building. Foundries, Iron and steel plants use lime as a fluxing agent in their process. Some drugs and pharmaceuticals, paper industry, pesticides formulations and other chemical processing industries are using the unslaked lime or Quick lime. As there are many applications of the quick lime, we should ensure particular properties of the quick lime for using in the recipe of AAC Blocks. Properties required for Quick lime in AAC manufacturing: Process of Manufacture The limestone mined from quarry or rivers should be free from all defects and impurities, once washed and cle