24 documents found, page 1 of 3
Circular economy in EU construction and demolition waste: persistent barriers, ...
Pacheco-Torgal, F.; Ding, Yining; Zhao, Xin-YuConstruction and demolition waste (CDW) is the largest single waste stream in the European Union by weight (~39% of all EU waste), yet the EU’s circular material use rate stood at only 12.2% in 2024 — less than half its 2030 target. Despite two decades of legislative ambition, the 70% recovery target under Directive 2008/98/EC has not been genuinely achieved: apparent compliance by most Member States conceals w...
Challenges and opportunities in construction and demolition waste management fo...
Pacheco-Torgal, F.; Ding, Yining; Zhao, Xin-YuThis chapter underscores the adverse environmental ramifications of resource extraction and the imperative for transitioning toward a circular economy (CE) paradigm. The construction and demolition waste (CDW) sector emerges as a significant arena for embracing CE principles, but faces obstacles such as regulatory incongruities and data integrity concerns. Case studies and modeling endeavors shed light on the i...
Experimental findings and predictive modeling of HyFRC‐RC beam with crack local...
Li, Dongsheng; Ding, Yining; Ding, Graciano; Pacheco-Torgal, F.The influence of hybrid macro steel fiber and macro polypropylene (PP) fiber on the flexural behavior of reinforced concrete beams is investigated in the present article. A total of 30 kg/m3 macro steel fiber and 4 kg/m3 macro PP fiber are adopted for their significant synergistic effect on the flexural toughness of concrete. Twelve reinforced concrete (RC) beams with steel ratios of 0.45%, 0.64%, and 0.87% are...
Exploring the effect of polyoxymethylene fiber on concrete toughness and self-s...
Ding, Yining; Guo, Wei; Li, Dongsheng; Pacheco-Torgal, F.This study explores the possibilities of the structural use of macro polyoxymethylene (POM) fibers in concrete and investigates the toughness and self-sensing performance to crack opening in POM fiber reinforced concrete (FRC) under bending. The residual flexural strengths of POM FRC are compared with macro polypropylene (PP) FRC with the same size and dosage of PP fiber. Macro steel fibers and nano carbon powd...
Topographical analysis of fractured surface roughness of macro fiber reinforced...
Ding, Yining; Zeng, Wei; Wang, Qing; Zhang, YulinMacro fibers reinforcement is considered to be an effective way to improve the flexural toughness of the concrete. With growing public interest in the wide-spread use of fiber reinforced concrete (FRC), the need for understanding and evaluating micro fiber reinforcement mechanism is on the rise. In this study, concretes were reinforced by various dopant amounts of macro polypropylene (PP) fiber or steel fiber (...
Recycled household ceramic waste in eco-efficient cement: a case study
Ding, Yining; Dong, Huiwen; Cao, Mingli; Pacheco-Torgal, F.; Azevedo, CeciliaThe ceramic wastes can cause strong damage to the environment. In this article, the experimental study was concentrated on the pozzolanic activity of household ceramic waste and clay bricks waste. The possibility of the partial replacement of Portland cement blended with ceramic waste powder without further heating treatment in different ratios was analyzed. The ceramic waste powder was mixed in samples in vari...
Effect of macro polypropylene fiber and basalt fiber on impact resistance of ba...
Wang, Qingxuan; Ding, Yining; Zhang, Yulin; Castro, CecíliaIn this paper, the effect of macro non-metallic fibers (i.e. polypropylene fibers and basalt fibers) on the impact response of basalt FRP-reinforced concrete discs is experimentally investigated using a self-developed drop-weight impact test device. The plain concrete and conventional steel reinforced concrete samples are explored as references. The impact resistance and failure behaviors are analyzed. Statisti...
Hybrid effect of fibre mesh and short fibres on the biaxial bending behaviour o...
Li, Dong; Ding, Yining; Wang, Qing; Zhang, Yongchao; Azevedo, Cecília; Zhang, YulinTextile mesh-reinforced concrete (TRC) and mortar have been studied in recent years. However, current testing methods are focused on simply supported members under uniaxial bending; these are inadequate for analysis of a biaxially tensioned fibre mesh and incapable of revealing the biaxial behaviour of a TRC panel. Moreover, the fibres can be damaged by the alkalinity of concrete. To overcome this inadequacy, a...
Quantitative analysis of macro steel fiber influence on crack geometry and wate...
Ding, Yining; Li, Dong; Zhang, YulinIn this work, the water permeability of the cracked concrete has been investigated. Three types of cylindrical specimens with different fiber content were pre-cracked by the feedback controlled splitting test, and the specimens without any fiber reinforcement were also studied as reference. The water permeability of the specimens with different crack width was measured by hydraulic permeability test. The coordi...
Experimental investigation on the composite effect of steel rebars and macro fi...
Ding, Yining; Li, Dong; Zhang, Yulin; Azevedo, CecíliaIn this study, the impact behavior of ten types of high performance self-compacting concrete (HPSCC) was explored using the drop-weight method. The HPSCC specimens were reinforced with steel rebars and different fibers for comparison with plain concrete. The reinforcement mechanism of the influences of steel rebars and different fibers on failure impact energy was explained. The composite effects of hybrid use ...