![]() The search for ways to get out of this dilemma starts with understanding the mechanisms of autogenous shrinkage. This dilemma is discussed in this contribution. This results in a kind of dilemma: the high density of low water/cement ratio concretes is desired, but the increased risk of (micro) cracking of these mixtures, of course, not. Low water/cement ratios, however, result in a dense microstructure, which is one of the desired features of high performance concrete because of the assumed increase in durability. ![]() ![]() Cracking increases the probability of ingress of aggressive substances into the concrete, jeopardizing the durability of the material. The lower the water/cement ratio of a mixture, the higher the autogenous shrinkage and the higher the probability of cracking. Autogenous shrinkage strains may cause cracking of brittle cement-based systems.
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