Effects of multi-walled carbon nanotubes on strength and interfacial transition zone of concrete
- Authors: Van Tonder, P. , Mafokoane, T.T.
- Date: 2014
- Subjects: Carbon nanotubes , Concrete - Mixing , Materials - Testing
- Type: Article
- Identifier: uj:5057 , ISBN 9781614994657 , ISBN 9781614994664 , http://hdl.handle.net/10210/13619
- Description: Multi-walled carbon nanotubes (MWCNTs) were used to try and eliminate the aggregate interfacial transition zone. Different concrete mixes were used in fixed proportions along with varying concentrations of CNTs. The CNTs were applied in different concentrations, namely, 0.05 wt%, 0.1 wt% and 0.2 wt%, per dry weight. CNTs were dispersed using sonication. Concrete specimens were tested for compressive, flexural and split-tensile strengths. For each test, thirteen mix designs were investigated which included untreated aggregates and CNTs, and treated aggregates and CNTs. The results were compared with the results of the control concrete. The results showed that the use of CNTs improves the compressive, flexural and split-tensile strengths. It was concluded that CNTs minimize the ITZ.
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Thin spray rock liners with different concentrations of nanoclays
- Authors: Van Tonder, P. , Booysen, C.J , Van Tonder, P
- Date: 2014
- Subjects: Nanostructured materials , Polymer-impregnated concrete , Reinforced concrete construction
- Type: Article
- Identifier: uj:5080 , ISBN 9781614994657 , ISBN 9781614994664 , http://hdl.handle.net/10210/13651
- Description: This study investigates the possibility of effectively replacing polymers in thin sprayed liners (TSL’s) with nanoclay particles. In the industry Nano particles are used in many different products to enhance their properties. The strength properties was analysed to see if the addition of nanoclays improve the strengths of the TSL product. Different concentrations of nanoclay were added to a standard TSL mixture in the place of polymer particles. The different composites were tested for Tensile Strength, Compression Strength, Shear Strength and Shear Bond Strength. Though there are other parameters to be tested, the study will only focus on those mentioned above, as they were considered to be the most important. The materials used for testing these characteristics were supplied by Oxyfibre. The mixtures have consisted of four different composites that included the standard mixture, 2% nanoclays, 4% nanoclays and 6% nanoclays.
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