Sulfate Resistance of Mortars and Concretes With Calciferous Aggregates


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Title: Sulfate Resistance of Mortars and Concretes With Calciferous Aggregates

Author(s): W. G. Piasta

Publication: Special Publication

Volume: 100


Appears on pages(s): 2153-2170

Keywords: aggregates; coarse aggregates; concrete durability; fly ash; granite; limestone; mortars (material); sulfate resistance; Materials Research

Date: 4/1/1987

This investigation was carried out in order to explain the effect of the kind of aggregate on sulfate resistance of concretes and mortars. The objects of the studies were concretes with the following crushed coarse (2 to 20 mm) aggregates: porous limestone (porosity 36 percent), dense limestone (porosity 5.5 percent), and granite and mortars with the same calciferous aggregates (0 to 2 mm) and quartz sand (0 to 2 mm). It has been stated on the basis of the results of investigation that the sulfate resistance of concretes was different according to the aggregate used. However, the durability of concrete with the porous calciferous aggregate has been much better than expected in spite of its very high porosity of 36 percent. It has also been discovered that the mortars with the porous aggregate have been of higher resistance than the concretes made of that aggregate. Generally, a higher resistance of cement with fly ash replacement has been found than that of ordinary portland cement.