Gas permeability and capillary porosity of self-compacting concrete

Autor: Veerle Boel, G. De Schutter, Katrien Audenaert
Rok vydání: 2007
Předmět:
Zdroj: Materials and Structures. 41:1283-1290
ISSN: 1871-6873
1359-5997
DOI: 10.1617/s11527-007-9326-x
Popis: Self-compacting concrete (SCC) can be placed without any external compaction avoiding some health risks as well as environmental problems. In order to obtain its key properties, a large amount of fine particles and a new generation of superplasticizers can be used. Earlier research by means of mercury intrusion porosimetry, already pointed out an important difference in pore structure between SCC and traditional concrete (TC). Since the transport properties of concrete are strongly depending on its pore structure, the question rises to what extent the gas permeability of SCC gets affected by the change in mixture design. In this paper the gas permeability of 16 mixtures SCC and 4 mixtures TC are being evaluated with special attention to the difference between SCC and TC, and the influence of the following parameters: water/cement ratio, powder content, type of filler, fineness of the filler, type of aggregate and cement/powder ratio. It was concluded that the gas permeability of SCC is about 5 times lower than the gas permeability of TC. The parameter with the largest impact on the gas permeability seems to be the water content and secondly the powder content. The capillary porosity has been estimated and a rather good correlation has been found with the gas permeability.
Databáze: OpenAIRE
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