Fibres introduction in self-compacting concrete using Belém materials

Author(s): F.F. Mendonça Filho, J.Z.R. Silva Junior
Paper category: Conference
Book title: 8th RILEM International Symposium on Fiber Reinforced Concrete: challenges and opportunities (BEFIB 2012)
Editor(s): Joaquim A.O. Barros
Print ISBN: 978-2-35158-132-2
e-ISBN: 978-2-35158-133-9
Publisher: RILEM Publications SARL
Pages: 589 - 597
Total Pages: 8
Language: English

Abstract: 
Concrete is relatively one of the youngest materials and had not achieved its full potential; this can be shown with the acceleration of developments of concrete that started in 1990. In addition to the growth in resistance and durability, breakthroughs also include special qualities such as aesthetics, speed in execution and previously impossible mechanical properties for this material. One of the great advances was the addition of fibre in concrete in order to make it ductile and tenacious, but this usually decreases the slump, which causes major problems of workability. However, the self-compacting concrete not only solves the difficulty dismissing the vibration, as it guarantees greater homogeneity in the structural level and better fibre-matrix bond. The present work proposes adding simultaneously two types of fibres (steel and polypropylene) in one SCC mix in such content that achieve synergy, which means showing a better cracking control and tenacity, is not enough, it should also be more ductile than FRC using only steel fibres. To achieve the expected it is necessary to tailor the fibres in a way that they complement each other, letting the secondary (polypropylene) to retard crack growth avoiding coalescence and allowing the primary (steel) to improve the tenacious behavior of the system. An extra advantage is the possibility to generate economy in the design of FRC replacing a fraction of steel fibres with polypropylene fibres, which are cheaper.

Online publication: 2013
Publication Type: abstract_only
Public price (Euros): 0.00