5TH International Congress on Technology - Engineering & Science - Kuala Lumpur - Malaysia (2018-02-01)

Effects Of Corrosive Environment To Concrete Structures Performance With Multi-layered Carbon Nanotubes

Concrete due to the high amount of materials, environmental compatibility, compressive resistance and high durability and cheapness is one of the most used building materials, which in some cases its useful life in corrosive environments such as acid invasion greatly decreases. In this regard, the subjects related to their useful life and durability have always been of interest to researchers. The purpose of this study was to investigate and compare the effects of multi-layered carbon nanotubes on the durability of concrete structures as well as mechanical properties and evaluation of concrete performance of carbon nanotubes with conventional concrete against corrosive media (2.5% sulfuric acid). In this study, the ratio of water to cement was used in the mixing scheme (w/c = 0.45). In the preparation of mixing designs, 0.045% and 0.15% and 0.2% by weight of cement were made with a multi-layered carbon nanotube with a length of 5-15 nm instead of cement. In the next phase, with increasing carbon nanotubes at 90 days of age, concrete samples containing 0.2 and 0.15 carbon nanotubes increased the compressive resistance by 49.2% and 48.1%, respectively, compared to the control sample and also we observed the lowest weight loss and corrosion in relation to the initial weight for samples containing 0.2 and 0.15 carbon nanotubes, 8.1 and 7.3 percent, respectively, compared to other samples in acid solution. In this research, by applying the necessary tests based on the relevant standards, comparing and analyzing different designs of Nanoscale materials in the design of the main concrete mix have been studied and in all the tests of compressive resistance, corrosion and adhesion resistance, the performance of Nano concrete had better performance than concrete cement.
S.M Mirhosseini, Yaghubi Feshki, Ali Hassani Joshaghani, Ehsanollah Zeighami