Abstract
In this study, the shrinkage and creep of concrete containing graphene oxide (GO) nanosheets were experimentally and theoretically investigated. Experiments for the shrinkage and creep of concrete with 0.02% and 0.08% GO nanosheets by the weight of cement and common concrete were carried out. Subsequently, the influence of GO nanosheets on the shrinkage and creep of concrete was analyzed and discussed. A modified model was developed to accurately predict the shrinkage and creep of concrete containing GO nanosheets after models for predicting shrinkage and creep of common concrete were compared and the influential factors and application scope were determined. Results indicate that: (1) GO nanosheets can increase the shrinkage strain and reduce the creep coefficient of concrete, and (2) a modified ACI209 (92) model can accurately predict the shrinkage and creep of concrete containing GO nanosheets. Factors considering concrete strength can be introduced in the model to improve the model accuracy.
Highlights
Concrete has been extensively applied to the building field, owing to its advantages such as easy material obtaining and strong plasticity, since it was invented [1,2,3]
Recent research has argued that the microstructure of cement composites is closely related to the compressive strength, bending strength, pore structure, and shrinkage value [16,17] and that graphene oxide (GO) nanosheets can improve the performance of cement composites
The shrinkage strain of the test samples was measured after 7 days of maintenance, so plastic shrinkage produced in the concrete molding and hardening process was not maintenance, so plastic shrinkage produced in the concrete molding and hardening process was not considered
Summary
Concrete has been extensively applied to the building field, owing to its advantages such as easy material obtaining and strong plasticity, since it was invented [1,2,3]. Recent research has argued that the microstructure of cement composites is closely related to the compressive strength, bending strength, pore structure, and shrinkage value [16,17] and that GO nanosheets can improve the performance of cement composites. There are few studies about the influence of GO nanosheets on the shrinkage and creep performance of cement and concrete, and such research is still at an early stage. There are many studies about the mechanical property [5,12,16,17,19,20], microstructure [12,16,17,21], and deformation performance [18,22] of concrete containing GO nanosheets the prediction model for the shrinkage and creep of concrete containing GO nanosheets is still not established, and there are only models for ordinary concrete.
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