42. Multi-mechanism design concept for developing highly ductile cementitious composites

Title: 42. Multi-mechanism design concept for developing highly ductile cementitious composites
Author(s): H. Mihashi, J.P. de B. Leite, A. Kawamata
Paper category : conference
Book title: 6th International RILEM Symposium on Fibre Reinforced Concretes
Editor(s): M. di Prisco, R. Felicetti and G.A. Plizzari
Print-ISBN: 2-912143-51-9
e-ISBN: 2912143748
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 515 - 524
Total Pages: 10
Nb references: 8
Language: English

Abstract: Development of highly ductile cementitious composites is one of the key issues for further advances in concrete structures. Two alternative design approaches to create highly ductile cementitious composites are presented. Both of them rely on multiple mechanisms to steadily counterbalance distinct properties of matrix fracture and fiber debonding resistance. The first design concept is based on uniform distribution of flaws, or artificial microcracks, to reduce fracture toughness of the matrix and attain certain homogenization. While this may reduce bonding strength, it can improve tensile ductility by increasing energy consumption in debonding larger number of polymeric fibers. The second design concept makes use of rational combination of polymeric and steel cord fibers for multistage balance of properties along cracking development to improve fracture toughness. Multiple mechanisms are essential to increase strain energy consumption and promote a significant pseudo-strain-hardening, which imparts desirable tensile ductility to concrete structures. Rational design concepts need to be clearly defined in order to allow for utilization of advanced cementitious materials in practice.

Online publication: 2004-08-30
Publication type : full_text
Public price (Euros): 0.00