Investigating the size effect of recycled concrete containing steel fibers

Document Type : Original Article

Authors

1 Civil Engineering Department, University of Sistan and Baluchestan, P.O. Box: 98155-987, Zahedan, Iran.

2 Civil Engineering Department, University of Sistan and Baluchestan, Zahedan, Iran

3 Civil Engineering Department, University of Zabol, Zabol, Iran

Abstract

Utilizing recycled aggregates in concrete makes new feasibility study possible for recirculation of materials in construction industry. One of the considerable points in using concrete is the alteration of mechanical properties by changing specimen size that is called size effect. Compressive strength test was conducted on cubic samples with variable sizes and standard cylinder 15*30. Water absorption and penetrability tests were conducted on 10 and 15 centimeter cubic samples. By replacing the results of compressive strength test in modified Bazantt’s formula and applying linear regression, empirical coefficients of α and β were obtained. By applying these coefficients in the above formula, the ratio of compressive strength of cube sample to standard cylinder was‌‌ obtained.
Examining the results for recycled concrete shows that by increasing the size of specimens, compressive strength declines which suggests the size effect on recycled concrete. In addition, adding 1.5% steel fibers to recycled concrete enhances the mechanical properties and durability. In addition, the size effect and differences between standard cylindrical and cubic compressive strength were decreased.

Keywords

Asas Journal
Volume 20, Issue 51
September 2018
Pages 5-15

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History

  • Receive Date: 26 April 2018
  • Revise Date: 13 September 2018
  • Accept Date: 21 September 2018

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