Recycling of steel fibres and spent equilibrium catalyst in ultra-high performance concrete: Literature review, research gaps, and future development

2021 ◽  
Vol 309 ◽  
pp. 125147
Author(s):  
Hassan Abdolpour ◽  
Paweł Niewiadomski ◽  
Łukasz Sadowski
Keyword(s):  
Literature Review ◽  
Future Development ◽  
High Performance ◽  
High Performance Concrete ◽  
Ultra High Performance Concrete ◽  
Research Gaps ◽  
Steel Fibres ◽  
Equilibrium Catalyst

Design of an Experimental Prestressed Vierendeel Pedestrian Bridge Made of UHPC

2014 ◽  
Vol 587-589 ◽  
pp. 1642-1645 ◽  
Author(s):  
Petr Tej ◽  
Alena Tejová
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Total Width ◽  
Bridge Structure ◽  
Ultra High Performance Concrete ◽  
Pedestrian Bridge ◽  
Main Structure ◽  
Steel Fibres

This paper presents the design of an experimental prestressed Vierendeel pedestrian bridge made of ultra-high performance concrete (UHPC). The structure is designed as a permanent single-span bridge with an intermediate deck. The span of the bridge structure is 61.38 m, the total width is 6.68 m, and the clearance width of the bridge is 5.30 m. The main structure of the bridge consists of two prestressed Vierendeel beams made of UHPC with dispersed steel fibres . The main beams are composed of prefabricated parts, subsequently prestressed.

Enhancing cracking resistance of ultra-high-performance concrete slabs using steel fibres

2015 ◽  
Vol 67 (10) ◽  
pp. 487-495 ◽  
Author(s):  
Doo-Yeol Yoo ◽  
Hyun-Oh Shin ◽  
Jin-Young Lee ◽  
Young-Soo Yoon
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Concrete Slabs ◽  
Ultra High Performance Concrete ◽  
Cracking Resistance ◽  
Steel Fibres

scholarly journals Effects of the combined usage of nanomaterials and steel fibres on the workability, compressive strength, and microstructure of ultra-high performance concrete

2021 ◽  
Vol 10 (1) ◽  
pp. 304-317
Author(s):  
Kunhong Huang ◽  
Jianhe Xie ◽  
Ronghui Wang ◽  
Yuan Feng ◽  
Rui Rao
Keyword(s):  
Compressive Strength ◽  
High Performance ◽  
High Performance Concrete ◽  
Negative Influence ◽  
Ultra High Performance Concrete ◽  
Engineering Structures ◽  
Steel Fibres ◽  
Strength Failure ◽  
Compressive Performance ◽  
Carbon Nanofibre

Abstract Using nanomaterials to enhance concrete performance is of particular interest to meet the safety and functionality requirements of engineering structures. However, there are few comprehensive comparisons of the effects of different nanomaterials on the properties of ultra-high performance concretes (UHPCs) with a compressive strength of more than 150 MPa. The aim of the present study was to assess the coupling effects of nanomaterials and steel fibres on the workability and compressive performance of UHPC. Three types of nanomaterials, nano-SiO2 (NS), nano-calcium carbonate (NC), and carbon nanofibre (CNF), were each added into UHPC mixes by quantity substitution of the binder; two types of steel fibres were investigated; and two mixing methods were used for casting the UHPC. In addition, the effect of curing age (7 or 28 days) on the compressive performance of the mixtures was considered. Comprehensive studies were conducted on the effects of these test variables on the fluidity, compressive strength, failure mode, and microstructure. The results show that the combination of these nanomaterials and steel fibres can provide good synergetic effects on the compressive performance of UHPC and that the addition of CNF results in a greater enhancement than the addition of NS or NC. The addition of NS, not CNF or NC, has a considerable negative influence on the fluidity of the UHPC paste. It is suggested that reducing the agglomeration of the nanomaterials would further improve the performance of the resulting UHPC.

Segregation of Steel Fibres of UHPFRC

2018 ◽  
Vol 272 ◽  
pp. 166-171
Author(s):  
Michal Ženíšek ◽  
Tomáš Vlach ◽  
Jakub Řepka ◽  
Tereza Pavlů
Keyword(s):  
High Performance ◽  
High Performance Concrete ◽  
Fresh Concrete ◽  
Circular Cross Section ◽  
Aggregate Size ◽  
Maximum Aggregate Size ◽  
Ultra High Performance Concrete ◽  
Steel Fibres ◽  
Cutting Surface

The mixture of ultra-high performance concrete is often supplemented by steel fibres which can significantly improve the fracture energy of the concrete. The incorporation of steel fibres results in especially a significant increase of tensile strength and minimize the risk of brittle failure. However, these positive properties can be fully realised only if the fibres are uniformly distributed. Otherwise, that leads to different quality of the concrete and to deterioration of strength characteristics. The subject of this article is the segregation of steel fibres which is one of the frequent problems of poor distribution of fibres. The degree of segregation has been investigated depending on amount of fibre dosage, size of maximum aggregate size and degree of consistency of fresh concrete. Two types of steel fibres with circular cross-section of a diameter of 0.4 mm but with different lengths (12.5 and 25 mm) were used for experiments. The segregation was evaluated by the drop of the fibres on the cutting surface of specimens. The results showed that segregation was the most affected by the consistency of fresh concrete. The amount of fibre dosage as well as the size of maximum aggregate size did not significantly affect segregation.

scholarly journals Ultra-High performance concrete (UHPC) with polypropylene (Pp) and steel Fibres: Investigation on the high temperature behaviour

2021 ◽  
Vol 304 ◽  
pp. 124608
Author(s):  
Francesca Sciarretta ◽  
Stefano Fava ◽  
Marco Francini ◽  
Luca Ponticelli ◽  
Mauro Caciolai ◽  
...  
Keyword(s):  
High Temperature ◽  
High Performance ◽  
High Performance Concrete ◽  
Ultra High Performance Concrete ◽  
Temperature Behaviour ◽  
Steel Fibres
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