Abstract
Restrained shrinkage tests of fresh concrete using conventional ring specimens with a steel core are sometimes not effective because of their relatively low cracking sensitivity. Modified ring specimens with a Perspex core having a high coefficient of thermal expansion were developed with the object of obtaining a test method which can provide cracking sensitivity results within a short time. An analysis of stress distribution is presented, taking into account the geometry and elasticity characteristics of the ring and core in specimens subjected to restrained shrinkage and heating. For tests of fresh plain and fibre-reinforced concretes, a Perspex core with additional stress concentrators (wedges) was used.
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