Encontrados 12 documentos, a visualizar página 1 de 2
Durability of alkali-activated binders : a clear advantage over Portland cement...
Torgal, Fernando Pacheco; Abdollahnejad, Zahra; Camões, Aires; Jamshidi, M.; Ding, YiningThe alkali activation of alumino-silicate materials is a complex chemical process evolving dissolution of raw materials, transportation or orientation and polycondensation of the reaction products. Publications on the field of alkali-activated binders, state that this new material is likely to have high potential to become an alternative to Portland cement. While some authors state that the durability of these ...
Properties and durability of concrete containing polymeric wastes (tyre rubber ...
Torgal, Fernando Pacheco; Ding, Yining; Jalali, SaidThe volume of polymeric wastes like tyre rubber and polyethylene terephthalate bottles (PET) is increasing at a fast rate. An estimated 1000 million tyres reach the end of their useful lives every year and 5000 millions more are expected to be discarded in a regular basis by the year 2030. Up to now a small part is recycled and millions of tyres are just stockpiled, landfilled or buried. As for PET bottles annu...
Study on residual behaviour and flexural toughness of fibre cocktail reinforced...
Ding, Yining; Azevedo, Cecília Maria; Aguiar, J. L. Barroso de; Jalali, SaidThis paper analyzed the effect of different fibres on the residual compressive strength, the ultimate load and flexural toughness, the failure pattern and the fracture energy of self compacting high-performance concrete (SCHPC) after exposure to various high temperature. The micro polypropylene fiber (PP fiber) could mitigate the spalling of SCHPC member significantly, but did not show clear effect on the mecha...
Shear behaviour of steel fibre reinforced self-consolidating concrete beams bas...
Ding, Yining; Zhang Fasheng; Torgal, Fernando Pacheco; Zhang YulinA series of steel fibre reinforced self-consolidating concrete (SFRSCC) beams have been tested to investigate the influence of steel fibres and the combined effect of fibres and stirrups on the deflection and cracking, ultimate loads and failure pattern. The experiment indicates that the shear strength increases clearly with the increasing of fibre content. The combination of steel fibres and stirrups demonstra...
Hybrid use of steel and carbon-fiber reinforced concrete for monitoring of crac...
Ding, Yining; Han, Z.; Zhang, Y.; Azevedo, Cecília MariaIn order to study the damage after concrete cracking, the influence of the combined use of steel fiber and carbon fiber on the conductivity and crack resistance of concrete beam under flexural loading were investigated. Carbon fiber and steel fiber were added as diphasic conductive materials to produce the electric conductive and ductile concrete. This paper reports the experimental and analytical work associat...
Are geopolymers more suitable than Portland cement to produce high volume recyc...
Torgal, Fernando Pacheco; Ding, Yining; Miraldo, Sérgio; Abdollahnejad, Zahra; Labrincha, J. A.The 70% minimum construction and demolition wastes-C&DW recycling rate set by the Revised Waste framework Directive No. 2008/98/EC to be enforced beyond 2020, will increase the need of effective recycling methods in a dramatic manner. So far, recycled aggregates (which constitute the majority of C&DW) are reused in low volume percentages for average compressive strength concretes and mostly as road sub-base and...
An overview on the potential of geopolymers for concrete infrastructure rehabil...
Torgal, Fernando Pacheco; Abdollahnejad, Zahra; Miraldo, Sérgio; Baklouti, S.; Ding, YiningInfrastructure rehabilitation represents a multitrillion dollar opportunity for the construction industry. In USA alone the rehabilitation needs are estimated to exceed 1.6 trillion dollars over the next 5 years. Since the majority of the existent infrastructures are concrete based this means that concrete infrastructure rehabilitation is a hot issue to be dealt with. Besides the sooner concrete deterioration i...
Experimental investigation on the mechanical behaviour of the fiber reinforced ...
Ding, Yining; Liu, Hekai; Torgal, Fernando Pacheco; Jalali, SaidThe main objective of this paper is to investigate the composite effect of macro steel fiber and steel rebar on the mechanical behaviour of tunnel segment with fiber reinforced high-performance concrete (FRHPC). A new experimental method is used for simulating the loading state of the tunnel segment. The experiment including several symmetric-inclination beams with various steel ratios and fiber contents has be...
Combined effect of steel fibres and steel rebars on impact resistance of high p...
Ding, Yining; Chen, Xiang-yu; Azevedo, Cecília MariaThe investigation on the impact properties of normal concrete (NC)and reinforced concrete (RC) specimens, steel fibre reinforced concrete (SFRC) specimens and RC+SFRC specimens with different steel fibres dosages were carried out with the drop-weight impact test recommended by ACI Committee 544. The results indicate that the number of blows to final failure greatly increased by addition of steel fibres. Moreove...
The investigation on strength and flexural toughness of fibre cocktail reinforc...
Ding Yining; Zhang Yulin; Thomas, A.Based on the experimental results of the workability, the suitable fibre types (steel fibres, PP-fibres and fibre cocktail) and fibre dosages for fibre-reinforced-self-compacting-high-performance-concrete (FRSCHPC) were selected. To assess the influences of different fibres on the compressive strength, flexural toughness and failure patterns of beams and slabs, a series of experiments has been carried out and e...
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