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Characteristics of Recycled Aggregate Powder Containing Mortar Depending on Grinding Efficiency

분쇄 효율에 따른 순환골재 분말 혼입 모르타르의 특성

Bang, Jinwook;Jang, Youngil;Lee, Jongwon;Mun, Seokho;Chu, Hyunseung
방진욱;장영일;이종원;문석호;추현승

  • Received : 2018.12.31
  • Accepted : 2019.02.12
  • Published : 2019.03.01

Abstract

In order to evaluating applicability of RAP (recycled aggregate powder) in mortar, in this study, physical and mechanical tests was carried out. Material characteristics of recycled aggregate and RAP were evaluated and the mechanical properties of mortar replaced with RAP were analyzed. Test result of sieve analysis showed that as the milling time increased the fineness modulus was decreased and the distribution of 0.6 mm particle size was found to increase. The fluidity of mortar mixture substituted with RAP tended to increase than Plain mixture. It was result that the increasing fluidity was affected by unreacted surplus water in the mortar as the binder was replaced with RAP. From the compressive strength result of the mortar subjected to RAP, it was found that the RAP was able to replace up to about 10% of unit binder weight although the compressive strength of mortar was decreased as the RAP replacement increased. From the above study, it can be concluded that the physical properties of RAP satisfied the quality standard of aggregate for replacement with fine aggregate. Moreover, in case of the RAP was replaced up to 10% of unit cement weight, it was able to be possible to improve fluidity and compressive strength of mortar.

Keywords

Recycled aggregate;Recycled aggregate powder;Mortar;Ball mill

Acknowledgement

Supported by : 한국연구재단