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2 2011

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Pore size distribution effects on the thermal conductivity of light weight autoclaved aerated concrete

100%

Kreft O. , Hausmann J. , Hubalkova J. , Aneziris C. G. , Straube B. , Schoch T.

2011

tom nr spec.

49-52

Aim of the present study was to correlate thermal conductivities of highly porous autoclaved aerated concrete (apparent density < 100 kg/m3) with appendant micro- and nano-structural properties. AAC specimens with approximate apparent densities, but different pore size distributions were fabricated through utilizing specially selected, surface active additives when preparing the slurry of raw materials, aluminum and water. The main focus of this study is on the quantitative analysis of size and morphology of both pores and solid skeleton by 3D X-ray tomography (CT) and scanning electron microscopy (SEM). Moreover, specific surface areas and pore size distributions were determined by the methods of gas adsorption and mercury porosimetry. Apparent thermal conductivities depend on the number of pores, pore size distributions and thicknesses of the separating walls of the solid skeleton. The present study provides further inside in the mechanisms of heat transfer in light weight autoclaved aerated concrete.

Physical properties of low density aircrete products

80%

Limbachiya M. C. , Kew H. Y.

2011

tom nr spec.

66-69

Currently in the UK, aircrete, also known as Autoclaved Aerated Concrete, masonry units are usually produced with a minimum declared compressive strength of 2.9 N/mm2 (measured to EN 772-1) and a minimum density of 400 kg/m3. However, newly introduced European Standards allow the use of lower strength and with this it is possible to produce lower density products, such as low-density aircrete with a minimum declared compressive strength of 2.0 N/mm2 and a density of 350 kg/m3. This paper provides details of an extensive investigation to assess key physical properties such as moisture properties, freeze/thaw resistance, thermal performance, combustibility and flanking sound performance of low-density aicrete products The results show that key physical properties of low-density aircrete were comparable to conventional aircrete products.