The sulfate resistance of various cementitious binders according to different performance indicators at Nordic countries conditions

摘要

The sulfate resistance of moderate C(3)A Portland and Portland limestone cements (respectively PC and PLC) and their mixes with fly ash (FA) was monitored according to five performance indicators: changes in length, in mass, in strength, in ultrasonic pulse velocity and in appearance. Mortar samples (40 x 40 x 160 mm) were immersed in sodium sulfate solution (16 g/l of Sail for up to 12 months at ambient +20 degrees C conditions and more common for Nordic countries +7 degrees C conditions. The water/binder ratio in mortars was 0.6, pre-curing period before immersion of mortar samples in sodium sulfate solution was 28 days in water at +20 degrees C.