TY - JOUR
T1 - Restraining effect of aggregates on autogenous shrinkage in cement mortar and concrete
AU - Lu, Tianshi
AU - Li, Zhenming
AU - Huang, Hao
PY - 2021
Y1 - 2021
N2 - 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.
AB - 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.
KW - Autogenous shrinkage
KW - Concrete
KW - Creep
KW - Mortar
KW - Restraining effect
UR - http://www.scopus.com/inward/record.url?scp=85103693328&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2021.123166
DO - 10.1016/j.conbuildmat.2021.123166
M3 - Article
AN - SCOPUS:85103693328
SN - 0950-0618
VL - 289
SP - 1
EP - 18
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 123166
ER -