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Analiza wpływu niektórych parametrów technologicznych na właściwości hydrauliczne geowłóknin igłowanych

100%

Grzybowska-Pietras J.

2012

tom Nr 9

36-39

Analiza wpływu wybranych parametrów procesu igłowania na właściwości hydrauliczne geowłóknin. Omówienie znaczenia składu surowcowego oraz liczby przeigłowań na charakterystyczną wielkość porów oraz nierównomierność struktury geowłóknin.

Analysis of the effect of process parameters on the hydraulic properties of needle punched geo nonwovens. Discussion of the importance of the composition and number of needling on the characteristic pore size and irregularity of the structure of needle punched geo nonwovens.

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

84%

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.

Porosity in autoclaved aerated concrete (AAC): A review on pore structure, types of porosity, measurement methods and effects of porosity on properties

84%

Schober G.

2011

tom nr spec.

39-43

The fraction of pore volume in AAC products covers the range from 65 to 90%. There is a set of different types of pores, e.g. large air pores are a macroscopic structural element, capillary pores and nano pores, which are connected to microstructure of the solid matrix and have specific functional effects. Different methods of pore generation and characterization of pore size distribution are summarized. Gas producing agents, foaming agents, prefabricated foam and voluminous water retarding components are compared with regard on their suitability for AAC product properties. Image analysis, mercury intrusion porosimetry, gas adsorption porosimetry and other methods are reviewed with respect of their application for AAC material. Influence of pore size, pore shape, proportion of different pore types on related properties is presented and discussed. Homogeneity of material, isotropy of properties and range of property values with respect to porosity influences are regarded.