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Effect of coarse aggregate volume on fracture behavior of self compacting concrete

Nikbin, I. M ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.conbuildmat.2013.11.041
  3. Abstract:
  4. This paper presents the effect of volume of coarse aggregate on fracture characteristics of self- compacting concrete (SCC). Based on an experimental programme, a series of three point bending tests were carried out on 58 notched beams. SCC was prepared with coarse aggregate in varying percentages of 30%, 40%, 50% and 60% (as the percentage of the total aggregate volume). For all mixes, the fracture parameters were analyzed by the work-of- fracture method (WFM) and by the size effect method (SEM) to obtain a suitable correlation between these methods which is used to calibrate fracture numerical models. The results showed that with decrease of volume of coarse aggregate from 60% to 30% in SCC, (a): fracture energies of GF in WFM and Gf in SEM strongly decrease which may be explained by the change in fractal dimensions, (b); based on size effect plot, behavior SCC specimens approaches linear elastic fracture mechanic (LEFM) criterion, (c): SCC ductility, measured by means of characteristic length (Lch) in WFM and fracture process zone length (Cf) in SEM, significantly decreases, (d): the brittleness number is approximately tripled
  5. Keywords:
  6. Aggregate volume ; Fracture energy ; Self compacting concrete ; Size effect ; Brittleness numbers ; Characteristic length ; Fracture characteristics ; Fracture parameter ; Fracture process zone ; Linear-elastic fracture mechanics ; Size effects ; Three-point bending test ; Fractal dimension ; Fracture ; Size determination ; Aggregates
  7. Source: Construction and Building Materials ; Volume 52 , 15 February , 2014 , Pages 137-145 ; ISSN: 09500618
  8. URL: http://www.sciencedirect.com/science/article/pii/S0950061813010738