A novel concrete mix has been developed that can achieve high levels of self-prestressing through the controlled expansion sample with cast-in carbon fibre reinforced polymer (CFRP) bars. Experiments have shown mechanical properties and durability are not adversely affected by mix’s self-expanding nature. However, behaviour this at elevated temperatures is largely unknown, raising legitimate co...

Since there are backlash friction and time-varying stiffness, the characteristics of gear pair has strong nonlinearity. When a gear has faults such as pitting, spalling and tooth breakage, there are often some nonlinear characteristics as super-harmonics or sub-harmonics along with vibration signal. These characteristics will cause some difficulty for fault diagnostics, so it is necessary to st...

This paper describes four standard scale fire tests conducted on precast prestressed hollow core slabs under flexure. The influence of the reinforcement arrangement was investigated using two test parameters: the average axis distance (from 30.1 to 46.7 mm), and the type of reinforcement (5 mm diameter wires and 9.5mm diameter strands). An ISO 834 standard fire was applied maintaining the load ...

T. Figlus, M. Stańczyk, The Silesian University of Technology, Faculty of Transport, Katowice, Poland The paper presents research aimed at diagnosing early cases of wear of gears tooth surface in the gearbox based on measurements of vibration signals and their processing using the wavelet packet transform. Analysis concerned the vibration signals recorded in a test bench experiment, during whic...