Utilizing Recycled Concrete and Stone Aggregate as Replace-ment for Natural and Crushed Virgin Aggregate

 
 
 
  • Abstract
  • Keywords
  • References
  • PDF
  • Abstract


    The mechanical properties of recycled concrete aggregate form Al-Anbar province in Iraq is presented in this paper. Recycled concrete and stone aggregates were utilized as replacements for both natural and crushed virgin aggregate. Four series of tests were conducted to study various replacement ratios (0.25, 0.50, 0.75 and 1.0) effect on compressive strength, splitting tensile strength and modulus of rupture. Density of concrete in addition to its water absorption were also investigated. Results of this work show that replacing natural and crushed virgin aggregate with waste concrete aggregate extracted from left-over concrete cubes and concrete barriers did not affect its mechanical properties significantly. In fact, in this study the general trend is that the compressive strength increases with increasing the replacement ratio from 0.0 to 1.0. However, the tensile strength showed different behaviour as there was a limit for the strength increase with replacement ratio where beyond it the strength started decreasing again. This limit varied between 0.50 and 0.75 depending on the type of aggregate used and the type of the test. The age of test did not affect the behaviour of the trialled mixes significantly. In addition to that, recycled stone aggregate proved to be an alternative choice only for lower grade concrete because it reduced both compressive and tensile strength in comparison to the reference mix.

     


  • Keywords


    Concrete, Crushed gravel, Mechanical properties, Natural gravel, Recycled concrete aggregate, Recycled stone aggregate.

  • References


      [1] ASTM Standard C496 (2004). Standard Test Method for Splitting Tensile Strength of Cylindrical Concrete Specimens.

      [2] ASTM Standard C78 (2002). Standard Test Method for Flexural Strength of Concrete (Using Simple Beam with Third-Point Loading).

      [3] Boyle S. (2013). Evaluation of recycled concrete for use as aggregates in new Portland cement concrete pavements. MSc. Washington State University. pp. 108.

      [4] British Standards Institution (2003). BS 1881: Part 116: Method for determination of compressive strength of concrete cubes.

      [5] Iraqi standard specifications No.45/1984, Natural resources aggregate used in concrete and buildings.

      [6] Iraqi standard specifications No.5/1984: Portland cement.

      [7] Kou S. (2006). Reusing recycled aggregate in structural concrete. PhD Thesis. The Hong Kong Polytechnic University. 313 pp.

      [8] Malešev M., Radonjanin V. and Marinković, S. (2010). Recycled concrete as aggregate for structural concrete production. Sustainability. :204-1225.

      [9] O'Mahony M. (1990). Recycling materials in civil engineering. PhD Thesis, University of Oxford. 233 pp.

      [10] Park S.G. (1999). Recycled concrete construction rubble as aggregate for new concrete. Building Research Association of New Zealand. Study Report SR 86. Judgeford.

      [11] Schulz R.R. (2004). Concrete with recycled rubble-developments in West Germany. Proc. 2nd International RILEM Symposium. Demolition and Reuse of Concrete and Masonry.2. Reuse of demolition waste. Japan.

      [12] Tijani A.I. (2016) High performance recycled aggregate concrete incorporating micro silica and synthetic macro fibre. PhD Thesis. University of Birmingham. 276 pp.

      [13] Yoshikane T. (2004). The instances of concrete recycled for base course material in Japan. Proc. 2nd International RILEM Symposium. Demolition and Reuse of Concrete and Masonry. 2. Reuse of demolition waste. Japan.


 

View

Download

Article ID: 23623
 
DOI: 10.14419/ijet.v7i4.37.23623




Copyright © 2012-2015 Science Publishing Corporation Inc. All rights reserved.