This paper investigates the mechanical and shrinkage behaviour of concrete with recycled cement (RC) thermoactivated from waste paste concrete. Overall, compared to ordinary Portland (OPC), for same water/binder ratio, strength ultrasonic pulse velocity were not significantly influenced by incorporation RC. The elasticity modulus decreased addition RC tended increase at high content. up 15% all...

non-destructive ultrasonic testing is one of the methods utilized to evaluate quality of agricultural produce. transducers used in this method are made for basically industrial applications. since ultrasonic attenuation of waves in agricultural produce is very high, industrial transducers cannot be used in agriculture and needs to be modified. this is done with horns that concentrate energy on ...

Ultrasonic propagation velocity across wood fiber direction was measured in wooden bridges in order to investigate the possibility of nondestructive deterioration diagnosis of wooden bridges. The measurements were carried out for three different types of wooden bridges. The periodical measurement was also made for one of them to investigate its secular change. The results were : (1) The histogr...