Computers and Concrete

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Rock wool wastes as a supplementary cementitious material replacement in cement-based composites

  • Lin, Wei-Ting (Dept. of Civil Engineering, National Ilan University) ;
  • Cheng, An (Dept. of Civil Engineering, National Ilan University) ;
  • Huang, Ran (Dept. of Harbor and River Engineering, National Taiwan Ocean University) ;
  • Wu, Yuan-Chieh (Institute of Nuclear Energy Research, Atomic Energy Council) ;
  • Han, Ta-Yuan (Dept. of Harbor and River Engineering, National Taiwan Ocean University)
  • Received : 2011.09.01
  • Accepted : 2012.04.24
  • Published : 2013.02.25
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Abstract

The use of rock wool waste, an industrial by-product, in cement-based composites has positive effects on the environment because it reduces the problems associated rock wool disposal. The experiments in this study tested cement-based composites using various rock wool waste contents (10, 20, 30 and 40% by weight of cement) as a partial replacement for Portland cement in mortars. The pozzolanic strength activity test, flow test, compressive strength test, dry shrinkage test, absorption test, initial surface absorption test and scanning electron microscope observations were conducted to evaluate the properties of cement-based composites. Test results demonstrate that the pozzolanic strength activity index for rock wool waste specimens is 103% after 91 days. The inclusion of rock wool waste in cement-based composites decreases its dry shrinkage and initial surface absorption, and increases its compressive strength. These improved properties are the result of the dense structure achieved by the filling effect and pozzolanic reactions of the rock wool waste. The addition of 30% and 10% rock wool wastes to cement is the optimal amount based on the results of compressive strength and initial surface absorption for a w/cm of 0.35 and 0.55, respectively. Therefore, it is feasible to utilize rock wool waste as a partial replacement of cement in cement-based composites.

Keywords

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