The effect of the superplasticizer ‘Melment’ on the creep and related properties of concrete has been studied under extreme conditions, in which the strength of the control concrete was the maximum attainable with the cement and aggregates used in the experiment, and in which the admixture dosage level was high enough to change slump from the original value of zero to collapsed, at constant mix proportions. It was observed that creep of the superplasticized concrete was 10% higher than in the control concrete, and that there was an increase in drying shrinkage, ranging from 10% at early and late ages, to about 25% at intermediate ages. The strength attained after 7 to 28 days of fog curing was not affected by the use of superplaticizer, whereas the strength developed after 18 months of drying was increased by about 15%. The effect of Melment on the modulus of elasticity was negligible.