Freezing and Thawing Durability of Three Cements with Various Granulated Blast Furnace Slag Contents


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Title: Freezing and Thawing Durability of Three Cements with Various Granulated Blast Furnace Slag Contents

Author(s): Michel Pigeon and Micheline Regourd

Publication: Special Publication

Volume: 79


Appears on pages(s): 979-998

Keywords: air entrainment; durability; microstructure; portland slag cements. -- blast furnace slag; mortars (material); freeze-thaw porosity;

Date: 5/1/1983

The 100% clinker anker and 70% sla freeze-d 0% sl g was s cm'/g Blaine) and one 3920 cm2/g Blaine) was varying air void chara An air entraining agen aggregate gradings were thaw resistance of three cements, 70% clinker and 30% slag, and tudied. Only one clinker (ground granulated blast-furnace slag (gr used. Six mortar mixes (W/C = 0 cteristics were fabricated from e t, a water reducer, and different used to produce a range of air vo C ontaining 30% clin-to 3165 und to 5) with ch cement. fine agd spacing factor (L) values. A total of 54 prisms, three of each mix, with dimensions of 70x70~280 mm were submitted after 28 days of moist curing to 500 freeze-thaw cycles (freezing in air and thawing in water). To assess the degree of deterioration, changes in length, dynamic E, and mass were measured. The characteristics of the three hydrated cement pastes were determined by scanning electron microscopy and mercury intrusion porosimetry. The freeze-thaw durability of all mixes was found to be very good. Only three specimens (made with the cement containing 70% slag) deteriorated significantly, and this was due to high spacing factor (L) values of the mixes made with this particular cemen and containing no additives. It is concluded that the observed good performance of the slag cements is due to the very dense and uniform structure of the hydrated paste and its fine pore texture.