55 THE PERMEABILITY OF HIGH STRENGTH BLAST FURNACE SLAG CONCRETE Tarja Håkkinen LicTech, Senior Research Scientist Technical Research Centre of Finland Building Materials Laboratory P.O. Box 26 (Kemistintie 3) SF-02150 ESPOO ABSTRACT The permeability properties of the high strength slag concrete were studied by means of carbonation tests, water suction and gas penetration. The permeability of the blended cement concrete was compared to that of the alkali activated slag concrete and Portland cement concrete. According to the results the high strength slag concrete aet i vated by cement. is very dense. The carbonation results indicated that in high strength concrete the dense structure of the paste compensates for the lack of calcium in blended cement concrete. In the alkali activated slag concrete the structure contains microcracks at the microscopic level. The rate of carbonation was significantly higher in alkali activated slag concrete than in ether concretes. The gas permeability results revealed the same tendencies as the carbonation tests. Water suction values were very low in the all high strength concrete samples. Key words: permeability, carbonation, blast furnace slag, high strength, microcracks. 1 INTRODUCTION The influence of the binder type on the permeability and microstructural properties of high strength concrete was studied. High strength Portland cement concrete, blended cement concrete and alkali activated slag concrete were compared with each ether. Especially the effect of microcracks in alkali activated slag concrete on the permeability properties were considered. The reasons for the cracking tendency in alkali activated slag concrete were discussed on the basis of the
THE PERMEABILITY OF HIGH STRENGTH BLAST FURNACE SLAG CONCRETE
Apr 25, 2023
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