Restraining effect of aggregates on autogenous shrinkage in cement mortar and concrete

Restraining effect of aggregates on autogenous shrinkage in cement mortar and concrete

Lu, T. (TU Delft Materials and Environment; Southwest Petroleum University)
Li, Z. (TU Delft Materials and Environment)
Huang, H. (TU Delft Materials and Environment)

2021

Shrinkage-induced cracking can impair the durability of concrete structures. In the past few decades, this topic has drawn more and more attention. Shrinkage of mortar and concrete is actually the result of the interaction between the shrinking cement paste and the non-shrinking aggregates. In recent years, different models that consider the restraining effect of aggregates, i.e. Series model and Hobbs’ model, have been proposed to predict the autogenous shrinkage of mortar and concrete. However, in these models both aggregate particles and cement paste matrix are considered as elastic materials. In fact, cement paste is not ideally elastic. Creep also plays an important role in autogenous shrinkage of mortar and concrete. In this paper an extended Pickett model, which takes the effect of creep into consideration, is proposed. The autogenous shrinkage of CEM I and CEM III/B cement mortar and concrete is simulated by using this model and compared with the experimental results to evaluate the accuracy of the predictions. The results show that the extended Pickett model can well predict the autogenous shrinkage of mortar and concrete.

Autogenous shrinkage
Concrete
Creep
Mortar
Restraining effect

http://resolver.tudelft.nl/uuid:1bb39a4e-814b-4a6c-adf1-6030f0c5951c

https://doi.org/10.1016/j.conbuildmat.2021.123166

0950-0618

Construction and Building Materials, 289, 1-18

Institutional Repository

journal article

© 2021 T. Lu, Z. Li, H. Huang