Abstract
Sulphur concrete made with syenite, granite, diorite, basalt and graywacke aggregate and 20% sulphur binder was found to expand excessively during continuous immersion in water. When the amount of sulphur was increased to 23% moisture expansion decreased but remained unacceptable for concrete made with syenite, granite and basalt aggregate. Concrete made with marble aggregate showed little change in dimensions upon immersion in water. The resonant frequency test showed that the concrete with the largest drop in relative dynamic modulus had the largest moisture expansion and water uptake but the strength retention was high and no cracks were observed on the surface of the specimens. Concrete which contained glycerine and silane admixtures showed reduced moisture expansion. The study showed that weathered rocks and particularly those with a larger specific surface area may cause moisture durability problems if used as aggregate in sulphur concrete; expansion may be greatly reduced by use of proper admixtures.
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