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Computers and Concrete
  Volume 11, Number 2, February 2013 , pages 93-104
DOI: https://doi.org/10.12989/cac.2013.11.2.093
 


Rock wool wastes as a supplementary cementitious material replacement in cement-based composites
Wei-Ting Lin, An Cheng, Ran Huang, Yuan-Chieh Wu and Ta-Yuan Han

 
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.
 
Key Words
    rock wool waste; pozzolanic strength activity index; initial surface absorption test; waste treatment
 
Address
Wei-Ting Lin: Dept. of Civil Engineering, National Ilan University, 1 Shen-Nong Road, Ilan 26047, Taiwan; nstitute of Nuclear Energy Research, Atomic Energy Council, Executive Yuan, 1000 Wenhua Road, Longtan 32546, Taiwan; An Cheng: Dept. of Civil Engineering, National Ilan University, 1 Shen-Nong Road, Ilan 26047, Taiwan; Ran Huang and Ta-Yuan Han: Dept. of Harbor and River Engineering, National Taiwan Ocean University, 2 Pei-Ning Rd., Keelung 20224, Taiwan; Yuan-Chieh Wu: Institute of Nuclear Energy Research, Atomic Energy Council, Executive Yuan, 1000 Wenhua Road, Longtan
32546, Taiwan
 

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