Synthetic and nature-based materials paper
Mirza, O, Taing, J, Satukitkosol, A, Yalda, A & Kukla, K 2014, 'The effect of cutting techniques on material properties of pre-stressed bars', in ST Smith (ed.), 23rd Australasian Conference on the Mechanics of Structures and Materials (ACMSM23), vol. I, Byron Bay, NSW, 9-12 December, Southern Cross University, Lismore, NSW, pp. 193-198. ISBN: 9780994152008.
The prestressing and pre-casting of concrete are inter-related features of the modern building industry and it is increasingly popular nowadays. This research investigates the material properties, the development length and ultimate strength of the pre-stressed bar using different cutting methods. The experiment conducted in the Mono-jack Calibration Frame for tensioning of the pre-stressed bar specimens. Three bar diameters have been studied. They include 26 mm, 29 mm and 36 mm. The experiment involved two cutting methods, abrasive blade cut and flame cut. The results analysed the factors such as ultimate load, ductility, ultimate strain and Young’s Modulus. The experiment results indicated the Young's Modulus increased according to the bar diameter. However, when compared with two cutting methods, the flame cut illustrated higher loss in ultimate load, ductility, ultimate strain and Young’s Modulus when compared to abrasive blade cut. It was also observed that the flame cut is four times faster than abrasive cut. Through this study, a series of design graphs were proposed. These design graphs are useful for the practice design engineers to choose the best and most practical cutting method on site.