ISO specifies methods for the determination of declared and design thermal values for thermally homogeneous building materials and products. Key examples are insulation, pn- en iso use of natural light a n d solar gainr ai nwater harvest in gsolar e n er gy, comb in e d heat a n pn- en iso . Buy ISO (R) BUILDING MATERIALS AND PRODUCTS - HYGROTHERMAL PROPERTIES - TABULATED DESIGN VALUES.
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Numerous masonry materials have increased moisture content as a result of wet production processes and often this condition adversely affects the parameters of building partitions. It is a common practice to built-in damp materials because of improper storage or due to moisture after the manufacturing process.
AAC is widely used for masonry wall construction in many countries, particularly in Europe. AAC products have different humidity during the masonry works, as well as the dynamics of their moisture stabilization is varied. The time needed to stabilize the moisture in the cellular concrete partition is between 1.
The first figures in both cases refer to AAC produced using siliceous sand and the second figures to units with fly ash. The examination of AAC walls in buildings after 30 to 40 years has confirmed that the moisture content of partition from sand AAC was about 2.
At such a moisture content, the partitions constructed from AAC units show good thermo-insulating properties [ 1 ]. Compressive strength is dependent on the moisture content of the material and decreases with moisture growth.
There is a close dependency of compressive strength, water absorption and other physical properties on material porosity and the pore size distribution. Moisture is the key feature that determines strength, shrinkage, carbonation and thermal conductivity [ 3 ].
Authors [ 7 ] describe the problem of determining the coefficient of thermal conductivity under various humidity conditions, based on the standard ISO [ 8 ] and experimental studies. Adding aluminum powder develops its cellular or foamed character.
AAC is produced in a variety of technologies, and the proportions of binders in concrete are also different. The C-S-H phase, which binds the sand particles, plays a major role in the structure formation of cellular concrete and its compression strength [ 9 ].
In AAC technologies the source of sulphates, besides cement, is usually calcium sulphate in the form of gypsum or anhydrite.
The most commonly used gypsum dihydrate hydrated calcium sulphate as one of the components of the concrete binder.
Sulphates in an aerated concrete mixture regulate the setting of the mixture.
The release of hydrogen in the cast aerated concrete mass is slower and the concrete microstructure is better. Sulphates influence the shape of tobermorite crystals - they are larger and flatter [ 13 ]. This additive has been used in AAC technology for years to improve the properties of this material.
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Final SOR Wood-based panels for use in construction - Characteristics This British Standard is the official English language version of. It supersedes BS EN which is withdrawn. It also presents the calculations of insulated solid walls: the corner of an