The present work describes the development of a test method which aims to detect the post-cracking behavior of the material in terms of crack opening displacement with time, in addition to the time of initiation of cracking. In fact, the reference standard method for the evaluation of the cracking risk is based on the so-called "ring test" (ASTM C1581) which, however, mainly detects the time of incipient cracking in concrete but does not provide direct measures of the cracking risk or indications on the behavior of post-cracking material failure.
National technical codes and international experimental investigations of drying shrinkage of concrete, do not provide direct information on the risk of cracking when the material is subjected to boundary conditions.
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Therefore, the risk of shrinkage cracking should be evaluated through restrained shrinkage tests since free shrinkage tests are not representative. Shrinkage makes cracks when some restraint prevents the free deformation of concrete. In design of floors, the shrinkage is the main cause of cracking that has generated numerous disputes between customers and manufacturers. In fact, the distance between the joints of the buildings or walls depends significantly on the shrinkage of the material. 4 Contributo in Atti di Convegno (Proceeding)ĭuring recent years it has been observed an increasing attention to the shrinkage of concrete by considering it as an action that cannot be neglected in structural design.
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