Mechanical properties of mortar and concrete incorporated with concentrated graphene oxide, functionalized carbon nanotube, nano silica hybrid aqueous solution

The purpose of this study was to develop concrete with all advantages by using combinations of various nanomaterials (f-CNTs, NS, GO) and to evaluate the mechanical performance. The mixing method for the nanomaterials developed so far has been useful in the laboratory, but its application in an industrial scale is limited. Therefore, a method for mixing concentrated aqueous solution was proposed by applying a dispersion method based on the functional group ratio of the nanomaterials. The effectiveness of the concentrated aqueous solution was confirmed through UV-Vis and mortar strength tests. To evaluate the mechanical performance of concrete, the uniaxial compression and splitting tensile tests were performed. As a result, the splitting tensile strength increased by about 23% and the elastic modulus by about 10% according to the incorporation of nanomaterials. In the absence of GO, which plays a major role in improving dispersion in the concentrate method, the application of triple nanomaterials in the concentrate method is essential as the variation of the tensile strength data is large. As the nanomaterial was incorporated and the dispersion was improved, not only the strength was increased, but also the volume dilation and the yield point of the concrete were changed. Therefore, when nanomaterials are used in concrete, the applicability of the nanomaterial itself needs to be improved to expand its applicability. And the mechanical properties of concrete improved by nanomaterials should be considered when designing structural members.