  This experimental study aims to determine the effect of limestone filler on
concrete expansion due to delayed ettringite formation (DEF). Different mortars
made with different sizes and percentages of limestone filler and Portland
cement CEM I 52.5N are conserved in water. The expansion of the specimens is
measured. Results show that DEF is not inhibited by limestone filler. The
kinetics and the amplitude of the swelling depend on the size of the limestone
filler. The volume fraction of aggregates changes only the kinetics: the
relation between swelling and water uptake depends only on the size of the
aggregates.
