A Feasibility Study on the Utilization of by-Product Sludge Generated from Waste Concrete Recycling Process

폐 콘크리트 재생순환자원 부산물 슬러지의 활용 기초연구

  • Received : 2016.03.29
  • Accepted : 2016.05.19
  • Published : 2016.06.30


The characteristics analysis and pH neutralization test were carried out to use of slurry generated from recycling processes of construction wastes. D (5.0) of raw sludge was $42.4{\mu}m$ and over 60 % of sludge distribute under 45 um (-325 mesh). Muscovite and carbonate minerals were main minerals of fine particles, and the portion of carbonate minerals increased as particle size decreased. Although the more heavy metals were observed in the finer particle size, the contents was found to be less than Korean contaminated soil regulation (area 2). The effects of flocculants addition for accelerating solid-liquid separation were negligible because the slurry already contains excess of coagulant added in the waste concrete recycling process. It was difficult to neutralize the sludge supernatant due to high pH (about 12) by adding acids, but the introduction of $CO_2$ decreased the pH to 8.5, The precipitate recovered during $CO_2$ introduction was determined to be $CaCO_3$ with XRD, and it indicates that high pure $CaCO_3$ could be obtained during the process.


Construction waste;Waste Concrete;Recycling;Sludge;$CaCO_3$


  1. Hong, S.W., Park, S., Ahn, Y.S., 2004: A Research on the Efficient Way and the Analysis of the Actual Condition for Recycling Waste Concrete Discharged as Construction Waste, J. of the Architectural Institute of Korea : Structure & construction, 20(2), pp97-104
  2. Jo, J.K., 2014: A Study on the effective recycling system through domestic construction wastes and current circumstance, Thesis for Master Degree of Yeungnam Univ., p.68
  3. MEV, 2013: The 4th National Waste Statistics Survey of MEV, Ministry of Environment (MEV), p.880
  4. Berndt, M. L., 2009: Properties of Sustainable Concrete Containing Fly Ash, Slag and Recycled Concrete Aggregate, Construction and Building Materials, 23(7), pp2606-2613.
  5. Kim, Y.J. and Chung, M.H., 2012: Study on the recycling of the construction wastes and reformation of the system, J. of The Organic Resource Recycling Association, 20(2), pp27-35
  6. Song, H. et al., 2014: Image and Phase Analysis of Low Carbon Type Recycled Cement Using Waste Concrete Powder", J. of the Korean Recycled Construction Resources Institute, 2(4), pp314-320
  7. Kim, Y.J., Choi, Y.W., Kim, Y.J., 2015: Utilizability of Waste Concrete Powder as a Material for Soil Pavement, J. of the Korean Recycled Construction Resources Institute, 3(3), pp277-282
  8. Ahn, J.W. and Yoo, K.S., 2009 : The Solidification of $CO_2$ by Using Waste Cement and Inorganic Waste By-Products, J. of Korean Inst. of Resources Recycling, 18(3), pp3-10
  9. Choi, Y.H. et al., 2014 : Studies for $CO_2$ Sequestration Using Cement Paste and Formation of Carbonate Minerals, J. Miner. Soc. Korea, 27(1), pp17-30
  10. Kim, W.R., 2015, Neutralization of AMD and $CO_2$ Sequestration using Waste Concrete, Thesis for Master Degree of Kangwon National Univ., p.57
  11. Jang, S.M., 2016: Optimization of design parameters on mineral carbonation using waste concrete, Thesis for Master Degree of Kongju National Univ., p.88
  12. Jo, B.W., Choi, J.S., Kim, K.T., 2013: A Study on the Strength Properties of Green Mortar Using Limestone Powder, J. of Korean Inst. of Resources Recycling, 22(3), pp36-42
  13. Park, J.H. et al., 2016: Optimizing the addition of flocculants for recycling mineral-processing wastewater, Geosystem Engineering, 19(2), pp83-88

Cited by

  1. An Eco-Friendly Neutralization Process by Carbon Mineralization for Ca-Rich Alkaline Wastewater Generated from Concrete Sludge vol.7, pp.9, 2017,


Supported by : 한국지질자원연구원