Comprehensive modeling of drying shrinkage strain of graphene oxide nanosheet concrete

In this paper, a comprehensive semi-empirical model is developed to predict the drying shrinkage strain of concrete reinforced by graphene oxide nanosheets (GONs). The model involves various internal and external parameters. The effects of three factors,including the age when drying starts, the GON content and aspect ratio on the drying shrinkage strain of concrete reinforced with GONs are investigated. It is found that the presented results are in good agreement with the experimental data compared to the results obtained from the other models, including CABR, CEB-78, CEB-90, ACI209(92), B3, and GL2000 for plain concrete, and modified ACI209(92) and B3 models for concrete with GONs. Moreover, several sensitivity analyses are done for the drying shrinkage strain of concrete with 0.02, 0.05 and 0.08wt% as functions of the relative environmental humidity, temperature, compressive strength, cement content, aggregate-cement ratio, size and dimensions of the sample, gravel-sand ratio, sand-cement ratio, and water-cement ratio. It is noted that the developed model not only evaluates the drying shrinkage behavior of concrete containing GONs well but it can also be applied to predict the drying shrinkage strain of cement that is reinforced by GONs.