The development of circular concrete, to enable key components be extracted and reused, is a requirement achieve sustainability in the built environment. Current industry practice for end-of-life concrete best described as down-cycling because recycled aggregate has limited use, with disposal associated crushed fines. Acid treatment waste being investigated allow become and, this work, effect a...

A plasticity model to predict the behavior of confined concrete is developed. The model is designed to implicitly account for the increase in strength and ductility due to confining a concrete member. The concrete model is implemented into a finite element (FE) model. By implicitly including the change in the strength and ductility in the material model, the confining material can be explicitly...

This paper presents experimental research on structural behaviour of normal and recycled aggregate concrete filled steel tube (RACFT) columns externally strengthened with carbon fibre reinforced polymer (CFRP) sheets and subjected to axial loading. A total of 22 specimens were tested to investigate the influence of the following variables: (1) tube configurations, circular or square, solid or h...

Abstract The source of hot water production for the investigated storage tanks are solar collectors. Solar collectors provide recharging underground all year round. Due to large active area - 225 m2, there also long-term accumulation. Accumulation in 3 sizes with a total volume 160 m3. With regard size tanks, mode is switched between according season. made reinforced concrete packaging structur...

Abstract This case study focuses on the evaluation of collapse rates various types reinforced concrete structures (residential and industrial) as observed from data collected in Romania after M w 7.4 Vrancea earthquake March 4, 1977. The results analyses show that largest were attributed to elevated silos water tanks. Moreover, majority collapsed tanks full at moment seismic event. Very small f...

The main objective of this study is to evaluate the workability of fresh portland cement concrete while it is still in the mixing truck by determining fundamental rheological parameters (plastic viscosity and yield stress). Nine concrete mixtures with different values of yield stress and plastic viscosity were tested in a concrete truck. The measurements made with the truck were based on the ty...

With all the real waste lying about, it might seem strange for chemists to create artificial waste. But that's exactly what's being done as part of the effort to ameliorate the seemingly intractable problem of radioactive contamination at Hanford Nuclear Site in southeastern Washington State. Cleaning up 55 million gallons of radioactive waste stored in tanks is a key task at the Hanford site, ...

a r t i c l e i n f o Keywords: Concrete-filled steel tube (CFST) Confinement effect Fuzzy logic Modified learning from example (MLFE) Axial load capacity A circular concrete-filled steel tube (CFST) has several advantages compared with the conventional reinforced concrete member or hollow steel tube, since the tri-axial state of compression of the concrete infill increases its strength and str...